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WinUAE/cpummu30.cpp
Frode Solheim 3a26167962 trivial changes
2014-07-30 00:04:46 +02:00

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/* Emulation of MC68030 MMU
* This code has been written for Previous - a NeXT Computer emulator
*
* This file is distributed under the GNU General Public License, version 2
* or at your option any later version. Read the file gpl.txt for details.
*
*
* Written by Andreas Grabher
*
* Many thanks go to Thomas Huth and the Hatari community for helping
* to test and debug this code!
*
*
* Release notes:
* 01-09-2012: First release
* 29-09-2012: Improved function code handling
* 16-11-2012: Improved exception handling
*
*
* - Check if read-modify-write operations are correctly detected for
* handling transparent access (see TT matching functions)
* - If possible, test mmu030_table_search with all kinds of translations
* (early termination, invalid descriptors, bus errors, indirect
* descriptors, PTEST in different levels, etc).
* - Check which bits of an ATC entry or the status register should be set
* and which should be un-set, if an invalid translation occurs.
* - Handle cache inhibit bit when accessing ATC entries
*/
#include "sysconfig.h"
#include "sysdeps.h"
#include "options.h"
#include "memory.h"
#include "newcpu.h"
#include "cpummu030.h"
#define MMU030_OP_DBG_MSG 0
#define MMU030_ATC_DBG_MSG 0
#define MMU030_REG_DBG_MSG 0
#define TT_FC_MASK 0x00000007
#define TT_FC_BASE 0x00000070
#define TT_RWM 0x00000100
#define TT_RW 0x00000200
#define TT_CI 0x00000400
#define TT_ENABLE 0x00008000
#define TT_ADDR_MASK 0x00FF0000
#define TT_ADDR_BASE 0xFF000000
static int bBusErrorReadWrite;
static int atcindextable[32];
static int tt_enabled;
int mmu030_idx;
uae_u32 mm030_stageb_address;
bool mmu030_retry;
int mmu030_opcode;
int mmu030_opcode_stageb;
uae_u16 mmu030_state[3];
uae_u32 mmu030_data_buffer;
uae_u32 mmu030_disp_store[2];
uae_u32 mmu030_fmovem_store[2];
struct mmu030_access mmu030_ad[MAX_MMU030_ACCESS];
/* for debugging messages */
char table_letter[4] = {'A','B','C','D'};
uae_u64 srp_030, crp_030;
uae_u32 tt0_030, tt1_030, tc_030;
uae_u16 mmusr_030;
/* ATC struct */
#define ATC030_NUM_ENTRIES 22
typedef struct {
struct {
uaecptr addr;
bool modified;
bool write_protect;
bool cache_inhibit;
bool bus_error;
} physical;
struct {
uaecptr addr;
uae_u32 fc;
bool valid;
} logical;
/* history bit */
int mru;
} MMU030_ATC_LINE;
/* MMU struct for 68030 */
static struct {
/* Translation tables */
struct {
struct {
uae_u32 mask;
uae_u8 shift;
} table[4];
struct {
uae_u32 mask;
uae_u32 imask;
uae_u8 size;
} page;
uae_u8 init_shift;
uae_u8 last_table;
} translation;
/* Transparent translation */
struct {
TT_info tt0;
TT_info tt1;
} transparent;
/* Address translation cache */
MMU030_ATC_LINE atc[ATC030_NUM_ENTRIES];
/* Condition */
bool enabled;
uae_u16 status;
} mmu030;
/* MMU Status Register
*
* ---x ---x x-xx x---
* reserved (all 0)
*
* x--- ---- ---- ----
* bus error
*
* -x-- ---- ---- ----
* limit violation
*
* --x- ---- ---- ----
* supervisor only
*
* ---- x--- ---- ----
* write protected
*
* ---- -x-- ---- ----
* invalid
*
* ---- --x- ---- ----
* modified
*
* ---- ---- -x-- ----
* transparent access
*
* ---- ---- ---- -xxx
* number of levels (number of tables accessed during search)
*
*/
#define MMUSR_BUS_ERROR 0x8000
#define MMUSR_LIMIT_VIOLATION 0x4000
#define MMUSR_SUPER_VIOLATION 0x2000
#define MMUSR_WRITE_PROTECTED 0x0800
#define MMUSR_INVALID 0x0400
#define MMUSR_MODIFIED 0x0200
#define MMUSR_TRANSP_ACCESS 0x0040
#define MMUSR_NUM_LEVELS_MASK 0x0007
/* -- MMU instructions -- */
void mmu_op30_pmove (uaecptr pc, uae_u32 opcode, uae_u16 next, uaecptr extra)
{
int preg = (next >> 10) & 31;
int rw = (next >> 9) & 1;
int fd = (next >> 8) & 1;
#if MMU030_OP_DBG_MSG
switch (preg) {
case 0x10:
write_log(_T("PMOVE: %s TC %08X\n"), rw?"read":"write",
rw?tc_030:x_get_long(extra));
break;
case 0x12:
write_log(_T("PMOVE: %s SRP %08X%08X\n"), rw?"read":"write",
rw?(uae_u32)(srp_030>>32)&0xFFFFFFFF:x_get_long(extra),
rw?(uae_u32)srp_030&0xFFFFFFFF:x_get_long(extra+4));
break;
case 0x13:
write_log(_T("PMOVE: %s CRP %08X%08X\n"), rw?"read":"write",
rw?(uae_u32)(crp_030>>32)&0xFFFFFFFF:x_get_long(extra),
rw?(uae_u32)crp_030&0xFFFFFFFF:x_get_long(extra+4));
break;
case 0x18:
write_log(_T("PMOVE: %s MMUSR %04X\n"), rw?"read":"write",
rw?mmusr_030:x_get_word(extra));
break;
case 0x02:
write_log(_T("PMOVE: %s TT0 %08X\n"), rw?"read":"write",
rw?tt0_030:x_get_long(extra));
break;
case 0x03:
write_log(_T("PMOVE: %s TT1 %08X\n"), rw?"read":"write",
rw?tt1_030:x_get_long(extra));
break;
default:
break;
}
if (!fd && !rw && !(preg==0x18)) {
write_log(_T("PMOVE: flush ATC\n"));
}
#endif
switch (preg)
{
case 0x10: // TC
if (rw)
x_put_long (extra, tc_030);
else {
tc_030 = x_get_long (extra);
mmu030_decode_tc(tc_030);
}
break;
case 0x12: // SRP
if (rw) {
x_put_long (extra, srp_030 >> 32);
x_put_long (extra + 4, srp_030);
} else {
srp_030 = (uae_u64)x_get_long (extra) << 32;
srp_030 |= x_get_long (extra + 4);
mmu030_decode_rp(srp_030);
}
break;
case 0x13: // CRP
if (rw) {
x_put_long (extra, crp_030 >> 32);
x_put_long (extra + 4, crp_030);
} else {
crp_030 = (uae_u64)x_get_long (extra) << 32;
crp_030 |= x_get_long (extra + 4);
mmu030_decode_rp(crp_030);
}
break;
case 0x18: // MMUSR
if (rw)
x_put_word (extra, mmusr_030);
else
mmusr_030 = x_get_word (extra);
break;
case 0x02: // TT0
if (rw)
x_put_long (extra, tt0_030);
else {
tt0_030 = x_get_long (extra);
mmu030.transparent.tt0 = mmu030_decode_tt(tt0_030);
}
break;
case 0x03: // TT1
if (rw)
x_put_long (extra, tt1_030);
else {
tt1_030 = x_get_long (extra);
mmu030.transparent.tt1 = mmu030_decode_tt(tt1_030);
}
break;
default:
write_log (_T("Bad PMOVE at %08x\n"),m68k_getpc());
op_illg (opcode);
return;
}
if (!fd && !rw && !(preg==0x18)) {
mmu030_flush_atc_all();
}
tt_enabled = (tt0_030 & TT_ENABLE) || (tt1_030 & TT_ENABLE);
}
void mmu_op30_ptest (uaecptr pc, uae_u32 opcode, uae_u16 next, uaecptr extra)
{
mmu030.status = mmusr_030 = 0;
int level = (next&0x1C00)>>10;
int rw = (next >> 9) & 1;
int a = (next >> 8) & 1;
int areg = (next&0xE0)>>5;
uae_u32 fc = mmu_op30_helper_get_fc(next);
bool write = rw ? false : true;
uae_u32 ret = 0;
/* Check this - datasheet says:
* "When the instruction specifies an address translation cache search
* with an address register operand, the MC68030 takes an F-line
* unimplemented instruction exception."
*/
if (!level && a) { /* correct ? */
write_log(_T("PTEST: Bad instruction causing F-line unimplemented instruction exception!\n"));
Exception(11); /* F-line unimplemented instruction exception */
return;
}
#if MMU030_OP_DBG_MSG
write_log(_T("PTEST%c: addr = %08X, fc = %i, level = %i, "),
rw?'R':'W', extra, fc, level);
if (a) {
write_log(_T("return descriptor to register A%i\n"), areg);
} else {
write_log(_T("do not return descriptor\n"));
}
#endif
if (!level) {
mmu030_ptest_atc_search(extra, fc, write);
} else {
ret = mmu030_ptest_table_search(extra, fc, write, level);
if (a) {
m68k_areg (regs, areg) = ret;
}
}
mmusr_030 = mmu030.status;
#if MMU030_OP_DBG_MSG
write_log(_T("PTEST status: %04X, B = %i, L = %i, S = %i, W = %i, I = %i, M = %i, T = %i, N = %i\n"),
mmusr_030, (mmusr_030&MMUSR_BUS_ERROR)?1:0, (mmusr_030&MMUSR_LIMIT_VIOLATION)?1:0,
(mmusr_030&MMUSR_SUPER_VIOLATION)?1:0, (mmusr_030&MMUSR_WRITE_PROTECTED)?1:0,
(mmusr_030&MMUSR_INVALID)?1:0, (mmusr_030&MMUSR_MODIFIED)?1:0,
(mmusr_030&MMUSR_TRANSP_ACCESS)?1:0, mmusr_030&MMUSR_NUM_LEVELS_MASK);
#endif
}
void mmu_op30_pload (uaecptr pc, uae_u32 opcode, uae_u16 next, uaecptr extra)
{
int rw = (next >> 9) & 1;
uae_u32 fc = mmu_op30_helper_get_fc(next);
bool write = rw ? false : true;
#if 0
write_log (_T("PLOAD%c: Create ATC entry for %08X, FC = %i\n"), write?'W':'R', extra, fc);
#endif
mmu030_flush_atc_page(extra);
mmu030_table_search(extra, fc, write, 0);
}
void mmu_op30_pflush (uaecptr pc, uae_u32 opcode, uae_u16 next, uaecptr extra)
{
uae_u16 mode = (next&0x1C00)>>10;
uae_u32 fc_mask = (uae_u32)(next&0x00E0)>>5;
uae_u32 fc_base = mmu_op30_helper_get_fc(next);
#if 0
switch (mode) {
case 0x1:
write_log(_T("PFLUSH: Flush all entries\n"));
break;
case 0x4:
write_log(_T("PFLUSH: Flush by function code only\n"));
write_log(_T("PFLUSH: function code: base = %08X, mask = %08X\n"), fc_base, fc_mask);
break;
case 0x6:
write_log(_T("PFLUSH: Flush by function code and effective address\n"));
write_log(_T("PFLUSH: function code: base = %08X, mask = %08X\n"), fc_base, fc_mask);
write_log(_T("PFLUSH: effective address = %08X\n"), extra);
break;
default:
break;
}
#endif
switch (mode) {
case 0x1:
mmu030_flush_atc_all();
break;
case 0x4:
mmu030_flush_atc_fc(fc_base, fc_mask);
break;
case 0x6:
mmu030_flush_atc_page_fc(extra, fc_base, fc_mask);
break;
default:
write_log(_T("PFLUSH ERROR: bad mode! (%i)\n"),mode);
break;
}
}
/* -- Helper function for MMU instructions -- */
uae_u32 mmu_op30_helper_get_fc(uae_u16 next) {
switch (next&0x0018) {
case 0x0010:
return (next&0x7);
case 0x0008:
return (m68k_dreg(regs, next&0x7)&0x7);
case 0x0000:
if (next&1) {
return (regs.dfc);
} else {
return (regs.sfc);
}
default:
write_log(_T("MMU_OP30 ERROR: bad fc source! (%04X)\n"),next&0x0018);
return 0;
}
}
/* -- ATC flushing functions -- */
/* This function flushes ATC entries depending on their function code */
void mmu030_flush_atc_fc(uae_u32 fc_base, uae_u32 fc_mask) {
int i;
for (i=0; i<ATC030_NUM_ENTRIES; i++) {
if (((fc_base&fc_mask)==(mmu030.atc[i].logical.fc&fc_mask)) &&
mmu030.atc[i].logical.valid) {
mmu030.atc[i].logical.valid = false;
#if MMU030_OP_DBG_MSG
write_log(_T("ATC: Flushing %08X\n"), mmu030.atc[i].physical.addr);
#endif
}
}
}
/* This function flushes ATC entries depending on their logical address
* and their function code */
void mmu030_flush_atc_page_fc(uaecptr logical_addr, uae_u32 fc_base, uae_u32 fc_mask) {
int i;
logical_addr &= mmu030.translation.page.imask;
for (i=0; i<ATC030_NUM_ENTRIES; i++) {
if (((fc_base&fc_mask)==(mmu030.atc[i].logical.fc&fc_mask)) &&
(mmu030.atc[i].logical.addr == logical_addr) &&
mmu030.atc[i].logical.valid) {
mmu030.atc[i].logical.valid = false;
#if MMU030_OP_DBG_MSG
write_log(_T("ATC: Flushing %08X\n"), mmu030.atc[i].physical.addr);
#endif
}
}
}
/* This function flushes ATC entries depending on their logical address */
void mmu030_flush_atc_page(uaecptr logical_addr) {
int i;
logical_addr &= mmu030.translation.page.imask;
for (i=0; i<ATC030_NUM_ENTRIES; i++) {
if ((mmu030.atc[i].logical.addr == logical_addr) &&
mmu030.atc[i].logical.valid) {
mmu030.atc[i].logical.valid = false;
#if MMU030_OP_DBG_MSG
write_log(_T("ATC: Flushing %08X\n"), mmu030.atc[i].physical.addr);
#endif
}
}
}
/* This function flushes all ATC entries */
void mmu030_flush_atc_all(void) {
#if MMU030_OP_DBG_MSG
write_log(_T("ATC: Flushing all entries\n"));
#endif
int i;
for (i=0; i<ATC030_NUM_ENTRIES; i++) {
mmu030.atc[i].logical.valid = false;
}
}
/* Transparent Translation Registers (TT0 and TT1)
*
* ---- ---- ---- ---- -xxx x--- x--- x---
* reserved, must be 0
*
* ---- ---- ---- ---- ---- ---- ---- -xxx
* function code mask (FC bits to be ignored)
*
* ---- ---- ---- ---- ---- ---- -xxx ----
* function code base (FC value for transparent block)
*
* ---- ---- ---- ---- ---- ---x ---- ----
* 0 = r/w field used, 1 = read and write is transparently translated
*
* ---- ---- ---- ---- ---- --x- ---- ----
* r/w field: 0 = write ..., 1 = read access transparent
*
* ---- ---- ---- ---- ---- -x-- ---- ----
* cache inhibit: 0 = caching allowed, 1 = caching inhibited
*
* ---- ---- ---- ---- x--- ---- ---- ----
* 0 = transparent translation enabled disabled, 1 = enabled
*
* ---- ---- xxxx xxxx ---- ---- ---- ----
* logical address mask
*
* xxxx xxxx ---- ---- ---- ---- ---- ----
* logical address base
*
*/
/* TT comparision results */
#define TT_NO_MATCH 0x1
#define TT_OK_MATCH 0x2
#define TT_NO_READ 0x4
#define TT_NO_WRITE 0x8
TT_info mmu030_decode_tt(uae_u32 TT) {
TT_info ret;
ret.fc_mask = ~((TT&TT_FC_MASK)|0xFFFFFFF8);
ret.fc_base = (TT&TT_FC_BASE)>>4;
ret.addr_base = TT & TT_ADDR_BASE;
ret.addr_mask = ~(((TT&TT_ADDR_MASK)<<8)|0x00FFFFFF);
#if 0
if ((TT&TT_ENABLE) && !(TT&TT_RWM)) {
write_log(_T("MMU Warning: Transparent translation of read-modify-write cycle is not correctly handled!\n"));
}
#endif
#if MMU030_REG_DBG_MSG /* enable or disable debugging messages */
write_log(_T("\n"));
write_log(_T("TRANSPARENT TRANSLATION: %08X\n"), TT);
write_log(_T("\n"));
write_log(_T("TT: transparent translation "));
if (TT&TT_ENABLE) {
write_log(_T("enabled\n"));
} else {
write_log(_T("disabled\n"));
return ret;
}
write_log(_T("TT: caching %s\n"), (TT&TT_CI) ? _T("inhibited") : _T("enabled"));
write_log(_T("TT: read-modify-write "));
if (TT&TT_RWM) {
write_log(_T("enabled\n"));
} else {
write_log(_T("disabled (%s only)\n"), (TT&TT_RW) ? _T("read") : _T("write"));
}
write_log(_T("\n"));
write_log(_T("TT: function code base: %08X\n"), ret.fc_base);
write_log(_T("TT: function code mask: %08X\n"), ret.fc_mask);
write_log(_T("\n"));
write_log(_T("TT: address base: %08X\n"), ret.addr_base);
write_log(_T("TT: address mask: %08X\n"), ret.addr_mask);
write_log(_T("\n"));
#endif
return ret;
}
/* This function compares the address with both transparent
* translation registers and returns the result */
int mmu030_match_ttr(uaecptr addr, uae_u32 fc, bool write)
{
int tt0, tt1;
bool cache_inhibit = false; /* TODO: pass to memory access function */
tt0 = mmu030_do_match_ttr(tt0_030, mmu030.transparent.tt0, addr, fc, write);
if (tt0&TT_OK_MATCH) {
cache_inhibit = (tt0_030&TT_CI) ? true : false;
}
tt1 = mmu030_do_match_ttr(tt1_030, mmu030.transparent.tt1, addr, fc, write);
if (tt1&TT_OK_MATCH) {
if (!cache_inhibit) {
cache_inhibit = (tt1_030&TT_CI) ? true : false;
}
}
return (tt0|tt1);
}
int mmu030_match_ttr_access(uaecptr addr, uae_u32 fc, bool write)
{
int tt0, tt1;
if (!tt_enabled)
return 0;
tt0 = mmu030_do_match_ttr(tt0_030, mmu030.transparent.tt0, addr, fc, write);
tt1 = mmu030_do_match_ttr(tt1_030, mmu030.transparent.tt1, addr, fc, write);
return (tt0|tt1) & TT_OK_MATCH;
}
/* Locked Read-Modify-Write */
int mmu030_match_lrmw_ttr_access(uaecptr addr, uae_u32 fc)
{
int tt0, tt1;
if (!tt_enabled)
return 0;
tt0 = mmu030_do_match_lrmw_ttr(tt0_030, mmu030.transparent.tt0, addr, fc);
tt1 = mmu030_do_match_lrmw_ttr(tt1_030, mmu030.transparent.tt1, addr, fc);
return (tt0|tt1) & TT_OK_MATCH;
}
/* This function checks if an address matches a transparent
* translation register */
/* FIXME:
* If !(tt&TT_RMW) neither the read nor the write portion
* of a read-modify-write cycle is transparently translated! */
int mmu030_do_match_ttr(uae_u32 tt, TT_info comp, uaecptr addr, uae_u32 fc, bool write)
{
if (tt & TT_ENABLE) { /* transparent translation enabled */
/* Compare actual function code with function code base using mask */
if ((comp.fc_base&comp.fc_mask)==(fc&comp.fc_mask)) {
/* Compare actual address with address base using mask */
if ((comp.addr_base&comp.addr_mask)==(addr&comp.addr_mask)) {
if (tt&TT_RWM) { /* r/w field disabled */
return TT_OK_MATCH;
} else {
if (tt&TT_RW) { /* read access transparent */
return write ? TT_NO_WRITE : TT_OK_MATCH;
} else { /* write access transparent */
return write ? TT_OK_MATCH : TT_NO_READ; /* TODO: check this! */
}
}
}
}
}
return TT_NO_MATCH;
}
int mmu030_do_match_lrmw_ttr(uae_u32 tt, TT_info comp, uaecptr addr, uae_u32 fc)
{
if ((tt & TT_ENABLE) && (tt & TT_RWM)) { /* transparent translation enabled */
/* Compare actual function code with function code base using mask */
if ((comp.fc_base&comp.fc_mask)==(fc&comp.fc_mask)) {
/* Compare actual address with address base using mask */
if ((comp.addr_base&comp.addr_mask)==(addr&comp.addr_mask)) {
return TT_OK_MATCH;
}
}
}
return TT_NO_MATCH;
}
/* Translation Control Register:
*
* x--- ---- ---- ---- ---- ---- ---- ----
* translation: 1 = enable, 0 = disable
*
* ---- --x- ---- ---- ---- ---- ---- ----
* supervisor root: 1 = enable, 0 = disable
*
* ---- ---x ---- ---- ---- ---- ---- ----
* function code lookup: 1 = enable, 0 = disable
*
* ---- ---- xxxx ---- ---- ---- ---- ----
* page size:
* 1000 = 256 bytes
* 1001 = 512 bytes
* 1010 = 1 kB
* 1011 = 2 kB
* 1100 = 4 kB
* 1101 = 8 kB
* 1110 = 16 kB
* 1111 = 32 kB
*
* ---- ---- ---- xxxx ---- ---- ---- ----
* initial shift
*
* ---- ---- ---- ---- xxxx ---- ---- ----
* number of bits for table index A
*
* ---- ---- ---- ---- ---- xxxx ---- ----
* number of bits for table index B
*
* ---- ---- ---- ---- ---- ---- xxxx ----
* number of bits for table index C
*
* ---- ---- ---- ---- ---- ----- ---- xxxx
* number of bits for table index D
*
*/
#define TC_ENABLE_TRANSLATION 0x80000000
#define TC_ENABLE_SUPERVISOR 0x02000000
#define TC_ENABLE_FCL 0x01000000
#define TC_PS_MASK 0x00F00000
#define TC_IS_MASK 0x000F0000
#define TC_TIA_MASK 0x0000F000
#define TC_TIB_MASK 0x00000F00
#define TC_TIC_MASK 0x000000F0
#define TC_TID_MASK 0x0000000F
void mmu030_decode_tc(uae_u32 TC) {
/* Set MMU condition */
if (TC & TC_ENABLE_TRANSLATION) {
mmu030.enabled = true;
} else {
if (mmu030.enabled)
write_log(_T("MMU disabled\n"));
mmu030.enabled = false;
return;
}
/* Note: 0 = Table A, 1 = Table B, 2 = Table C, 3 = Table D */
int i, j;
uae_u8 TI_bits[4] = {0,0,0,0};
/* Reset variables before extracting new values from TC */
for (i = 0; i < 4; i++) {
mmu030.translation.table[i].mask = 0;
mmu030.translation.table[i].shift = 0;
}
/* Extract initial shift and page size values from TC register */
mmu030.translation.page.size = (TC & TC_PS_MASK) >> 20;
mmu030.translation.init_shift = (TC & TC_IS_MASK) >> 16;
regs.mmu_page_size = 1 << mmu030.translation.page.size;
write_log(_T("68030 MMU enabled. Page size = %d\n"), regs.mmu_page_size);
if (mmu030.translation.page.size<8) {
write_log(_T("MMU Configuration Exception: Bad value in TC register! (bad page size: %i byte)\n"),
1<<mmu030.translation.page.size);
Exception(56); /* MMU Configuration Exception */
return;
}
mmu030.translation.page.mask = regs.mmu_page_size - 1;
mmu030.translation.page.imask = ~mmu030.translation.page.mask;
/* Calculate masks and shifts for later extracting table indices
* from logical addresses using: index = (addr&mask)>>shift */
/* Get number of bits for each table index */
for (i = 0; i < 4; i++) {
j = (3-i)*4;
TI_bits[i] = (TC >> j) & 0xF;
}
/* Calculate masks and shifts for each table */
mmu030.translation.last_table = 0;
uae_u8 shift = 32 - mmu030.translation.init_shift;
for (i = 0; (i < 4) && TI_bits[i]; i++) {
/* Get the shift */
shift -= TI_bits[i];
mmu030.translation.table[i].shift = shift;
/* Build the mask */
for (j = 0; j < TI_bits[i]; j++) {
mmu030.translation.table[i].mask |= (1<<(mmu030.translation.table[i].shift + j));
}
/* Update until reaching the last table */
mmu030.translation.last_table = i;
}
#if MMU030_REG_DBG_MSG
/* At least one table has to be defined using at least
* 1 bit for the index. At least 2 bits are necessary
* if there is no second table. If these conditions are
* not met, it will automatically lead to a sum <32
* and cause an exception (see below). */
if (!TI_bits[0]) {
write_log(_T("MMU Configuration Exception: Bad value in TC register! (no first table index defined)\n"));
} else if ((TI_bits[0]<2) && !TI_bits[1]) {
write_log(_T("MMU Configuration Exception: Bad value in TC register! (no second table index defined and)\n"));
write_log(_T("MMU Configuration Exception: Bad value in TC register! (only 1 bit for first table index)\n"));
}
#endif
/* TI fields are summed up until a zero field is reached (see above
* loop). The sum of all TI field values plus page size and initial
* shift has to be 32: IS + PS + TIA + TIB + TIC + TID = 32 */
if ((shift-mmu030.translation.page.size)!=0) {
write_log(_T("MMU Configuration Exception: Bad value in TC register! (bad sum)\n"));
Exception(56); /* MMU Configuration Exception */
return;
}
#if MMU030_REG_DBG_MSG /* enable or disable debugging output */
write_log(_T("\n"));
write_log(_T("TRANSLATION CONTROL: %08X\n"), TC);
write_log(_T("\n"));
write_log(_T("TC: translation %s\n"), (TC&TC_ENABLE_TRANSLATION ? _T("enabled") : _T("disabled")));
write_log(_T("TC: supervisor root pointer %s\n"), (TC&TC_ENABLE_SUPERVISOR ? _T("enabled") : _T("disabled")));
write_log(_T("TC: function code lookup %s\n"), (TC&TC_ENABLE_FCL ? _T("enabled") : _T("disabled")));
write_log(_T("\n"));
write_log(_T("TC: Initial Shift: %i\n"), mmu030.translation.init_shift);
write_log(_T("TC: Page Size: %i byte\n"), (1<<mmu030.translation.page.size));
write_log(_T("\n"));
for (i = 0; i <= mmu030.translation.last_table; i++) {
write_log(_T("TC: Table %c: mask = %08X, shift = %i\n"), table_letter[i], mmu030.translation.table[i].mask, mmu030.translation.table[i].shift);
}
write_log(_T("TC: Page: mask = %08X\n"), mmu030.translation.page.mask);
write_log(_T("\n"));
write_log(_T("TC: Last Table: %c\n"), table_letter[mmu030.translation.last_table]);
write_log(_T("\n"));
#endif
}
/* Root Pointer Registers (SRP and CRP)
*
* ---- ---- ---- ---- xxxx xxxx xxxx xx-- ---- ---- ---- ---- ---- ---- ---- xxxx
* reserved, must be 0
*
* ---- ---- ---- ---- ---- ---- ---- ---- xxxx xxxx xxxx xxxx xxxx xxxx xxxx ----
* table A address
*
* ---- ---- ---- ---- ---- ---- ---- --xx ---- ---- ---- ---- ---- ---- ---- ----
* descriptor type
*
* -xxx xxxx xxxx xxxx ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
* limit
*
* x--- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
* 0 = upper limit, 1 = lower limit
*
*/
#define RP_ADDR_MASK (UVAL64(0x00000000FFFFFFF0))
#define RP_DESCR_MASK (UVAL64(0x0000000300000000))
#define RP_LIMIT_MASK (UVAL64(0x7FFF000000000000))
#define RP_LOWER_MASK (UVAL64(0x8000000000000000))
#define RP_ZERO_BITS 0x0000FFFC /* These bits in upper longword of RP must be 0 */
void mmu030_decode_rp(uae_u64 RP) {
uae_u8 descriptor_type = (RP & RP_DESCR_MASK) >> 32;
if (!descriptor_type) { /* If descriptor type is invalid */
write_log(_T("MMU Configuration Exception: Root Pointer is invalid!\n"));
Exception(56); /* MMU Configuration Exception */
}
#if MMU030_REG_DBG_MSG /* enable or disable debugging output */
uae_u32 table_limit = (RP & RP_LIMIT_MASK) >> 48;
uae_u32 first_addr = (RP & RP_ADDR_MASK);
write_log(_T("\n"));
write_log(_T("ROOT POINTER: %08X%08X\n"), (uae_u32)(RP>>32)&0xFFFFFFFF, (uae_u32)(RP&0xFFFFFFFF));
write_log(_T("\n"));
write_log(_T("RP: descriptor type = %i "), descriptor_type);
switch (descriptor_type) {
case 0:
write_log(_T("(invalid descriptor)\n"));
break;
case 1:
write_log(_T("(early termination page descriptor)\n"));
break;
case 2:
write_log(_T("(valid 4 byte descriptor)\n"));
break;
case 3:
write_log(_T("(valid 8 byte descriptor)\n"));
break;
}
write_log(_T("RP: %s limit = %i\n"), (RP&RP_LOWER_MASK) ? _T("lower") : _T("upper"), table_limit);
write_log(_T("RP: first table address = %08X\n"), first_addr);
write_log(_T("\n"));
#endif
}
/* Descriptors */
#define DESCR_TYPE_MASK 0x00000003
#define DESCR_TYPE_INVALID 0 /* all tables */
#define DESCR_TYPE_EARLY_TERM 1 /* all but lowest level table */
#define DESCR_TYPE_PAGE 1 /* only lowest level table */
#define DESCR_TYPE_VALID4 2 /* all but lowest level table */
#define DESCR_TYPE_INDIRECT4 2 /* only lowest level table */
#define DESCR_TYPE_VALID8 3 /* all but lowest level table */
#define DESCR_TYPE_INDIRECT8 3 /* only lowest level table */
#define DESCR_TYPE_VALID_MASK 0x2 /* all but lowest level table */
#define DESCR_TYPE_INDIRECT_MASK 0x2 /* only lowest level table */
/* Short format (4 byte):
*
* ---- ---- ---- ---- ---- ---- ---- --xx
* descriptor type:
* 0 = invalid
* 1 = page descriptor (early termination)
* 2 = valid (4 byte)
* 3 = valid (8 byte)
*
*
* table descriptor:
* ---- ---- ---- ---- ---- ---- ---- -x--
* write protect
*
* ---- ---- ---- ---- ---- ---- ---- x---
* update
*
* xxxx xxxx xxxx xxxx xxxx xxxx xxxx ----
* table address
*
*
* (early termination) page descriptor:
* ---- ---- ---- ---- ---- ---- ---- -x--
* write protect
*
* ---- ---- ---- ---- ---- ---- ---- x---
* update
*
* ---- ---- ---- ---- ---- ---- ---x ----
* modified
*
* ---- ---- ---- ---- ---- ---- -x-- ----
* cache inhibit
*
* ---- ---- ---- ---- ---- ---- x-x- ----
* reserved (must be 0)
*
* xxxx xxxx xxxx xxxx xxxx xxxx ---- ----
* page address
*
*
* indirect descriptor:
* xxxx xxxx xxxx xxxx xxxx xxxx xxxx xx--
* descriptor address
*
*/
#define DESCR_WP 0x00000004
#define DESCR_U 0x00000008
#define DESCR_M 0x00000010 /* only last level table */
#define DESCR_CI 0x00000040 /* only last level table */
#define DESCR_TD_ADDR_MASK 0xFFFFFFF0
#define DESCR_PD_ADDR_MASK 0xFFFFFF00
#define DESCR_ID_ADDR_MASK 0xFFFFFFFC
/* Long format (8 byte):
*
* ---- ---- ---- ---- ---- ---- ---- --xx | ---- ---- ---- ---- ---- ---- ---- ----
* descriptor type:
* 0 = invalid
* 1 = page descriptor (early termination)
* 2 = valid (4 byte)
* 3 = valid (8 byte)
*
*
* table desctriptor:
* ---- ---- ---- ---- ---- ---- ---- -x-- | ---- ---- ---- ---- ---- ---- ---- ----
* write protect
*
* ---- ---- ---- ---- ---- ---- ---- x--- | ---- ---- ---- ---- ---- ---- ---- ----
* update
*
* ---- ---- ---- ---- ---- ---- xxxx ---- | ---- ---- ---- ---- ---- ---- ---- ----
* reserved (must be 0)
*
* ---- ---- ---- ---- ---- ---x ---- ---- | ---- ---- ---- ---- ---- ---- ---- ----
* supervisor
*
* ---- ---- ---- ---- xxxx xxx- ---- ---- | ---- ---- ---- ---- ---- ---- ---- ----
* reserved (must be 1111 110)
*
* -xxx xxxx xxxx xxxx ---- ---- ---- ---- | ---- ---- ---- ---- ---- ---- ---- ----
* limit
*
* x--- ---- ---- ---- ---- ---- ---- ---- | ---- ---- ---- ---- ---- ---- ---- ----
* 0 = upper limit, 1 = lower limit
*
* ---- ---- ---- ---- ---- ---- ---- ---- | xxxx xxxx xxxx xxxx xxxx xxxx xxxx ----
* table address
*
*
* (early termination) page descriptor:
* ---- ---- ---- ---- ---- ---- ---- -x-- | ---- ---- ---- ---- ---- ---- ---- ----
* write protect
*
* ---- ---- ---- ---- ---- ---- ---- x--- | ---- ---- ---- ---- ---- ---- ---- ----
* update
*
* ---- ---- ---- ---- ---- ---- ---x ---- | ---- ---- ---- ---- ---- ---- ---- ----
* modified
*
* ---- ---- ---- ---- ---- ---- -x-- ---- | ---- ---- ---- ---- ---- ---- ---- ----
* cache inhibit
*
* ---- ---- ---- ---- ---- ---x ---- ---- | ---- ---- ---- ---- ---- ---- ---- ----
* supervisor
*
* ---- ---- ---- ---- ---- ---- x-x- ---- | ---- ---- ---- ---- ---- ---- ---- ----
* reserved (must be 0)
*
* ---- ---- ---- ---- xxxx xxx- ---- ---- | ---- ---- ---- ---- ---- ---- ---- ----
* reserved (must be 1111 110)
*
* -xxx xxxx xxxx xxxx ---- ---- ---- ---- | ---- ---- ---- ---- ---- ---- ---- ----
* limit (only used with early termination page descriptor)
*
* x--- ---- ---- ---- ---- ---- ---- ---- | ---- ---- ---- ---- ---- ---- ---- ----
* 0 = upper limit, 1 = lower limit (only used with early termination page descriptor)
*
* ---- ---- ---- ---- ---- ---- ---- ---- | xxxx xxxx xxxx xxxx xxxx xxxx ---- ----
* page address
*
*
* indirect descriptor:
* ---- ---- ---- ---- ---- ---- ---- ---- | xxxx xxxx xxxx xxxx xxxx xxxx xxxx xx--
* descriptor address
*
*/
/* only for long descriptors */
#define DESCR_S 0x00000100
#define DESCR_LIMIT_MASK 0x7FFF0000
#define DESCR_LOWER_MASK 0x80000000
/* This functions searches through the translation tables. It can be used
* for PTEST (levels 1 to 7). Using level 0 creates an ATC entry. */
uae_u32 mmu030_table_search(uaecptr addr, uae_u32 fc, bool write, int level) {
/* During table walk up to 7 different descriptors are used:
* root pointer, descriptors fetched from function code lookup table,
* tables A, B, C and D and one indirect descriptor */
uae_u32 descr[2];
uae_u32 descr_type;
uaecptr descr_addr[7];
uaecptr table_addr = 0;
uaecptr page_addr = 0;
uaecptr indirect_addr = 0;
uae_u32 table_index = 0;
uae_u32 limit = 0;
uae_u32 unused_fields_mask = 0;
bool super = (fc&4) ? true : false;
bool super_violation = false;
bool write_protected = false;
bool cache_inhibit = false;
bool descr_modified = false;
mmu030.status = 0; /* Reset status */
/* Initial values for condition variables.
* Note: Root pointer is long descriptor. */
int t = 0;
int addr_position = 1;
int next_size = 0;
int descr_size = 8;
int descr_num = 0;
bool early_termination = false;
int i;
TRY(prb) {
/* Use super user root pointer if enabled in TC register and access is in
* super user mode, else use cpu root pointer. */
if ((tc_030&TC_ENABLE_SUPERVISOR) && super) {
descr[0] = (srp_030>>32)&0xFFFFFFFF;
descr[1] = srp_030&0xFFFFFFFF;
#if MMU030_REG_DBG_MSG
write_log(_T("Supervisor Root Pointer: %08X%08X\n"),descr[0],descr[1]);
#endif // MMU030_REG_DBG_MSG
} else {
descr[0] = (crp_030>>32)&0xFFFFFFFF;
descr[1] = crp_030&0xFFFFFFFF;
#if MMU030_REG_DBG_MSG
write_log(_T("CPU Root Pointer: %08X%08X\n"),descr[0],descr[1]);
#endif
}
if (descr[0]&RP_ZERO_BITS) {
#if MMU030_REG_DBG_MSG
write_log(_T("MMU Warning: Root pointer reserved bits are non-zero! %08X\n"), descr[0]);
#endif
descr[0] &= (~RP_ZERO_BITS);
}
/* Check descriptor type of root pointer */
descr_type = descr[0]&DESCR_TYPE_MASK;
switch (descr_type) {
case DESCR_TYPE_INVALID:
write_log(_T("Fatal error: Root pointer is invalid descriptor!\n"));
mmu030.status |= MMUSR_INVALID;
goto stop_search;
case DESCR_TYPE_EARLY_TERM:
write_log(_T("Root pointer is early termination page descriptor.\n"));
early_termination = true;
goto handle_page_descriptor;
case DESCR_TYPE_VALID4:
next_size = 4;
break;
case DESCR_TYPE_VALID8:
next_size = 8;
break;
}
/* If function code lookup is enabled in TC register use function code as
* index for top level table, limit check not required */
if (tc_030&TC_ENABLE_FCL) {
write_log(_T("Function code lookup enabled, FC = %i\n"), fc);
addr_position = (descr_size==4) ? 0 : 1;
table_addr = descr[addr_position]&DESCR_TD_ADDR_MASK;
table_index = fc; /* table index is function code */
write_log(_T("Table FCL at %08X: index = %i, "),table_addr,table_index);
/* Fetch next descriptor */
descr_num++;
descr_addr[descr_num] = table_addr+(table_index*next_size);
if (next_size==4) {
descr[0] = phys_get_long(descr_addr[descr_num]);
#if MMU030_REG_DBG_MSG
write_log(_T("Next descriptor: %08X\n"),descr[0]);
#endif
} else {
descr[0] = phys_get_long(descr_addr[descr_num]);
descr[1] = phys_get_long(descr_addr[descr_num]+4);
#if MMU030_REG_DBG_MSG
write_log(_T("Next descriptor: %08X%08X\n"),descr[0],descr[1]);
#endif
}
descr_size = next_size;
/* Check descriptor type */
descr_type = descr[0]&DESCR_TYPE_MASK;
switch (descr_type) {
case DESCR_TYPE_INVALID:
write_log(_T("Invalid descriptor!\n"));
/* stop table walk */
mmu030.status |= MMUSR_INVALID;
goto stop_search;
case DESCR_TYPE_EARLY_TERM:
#if MMU030_REG_DBG_MSG
write_log(_T("Early termination page descriptor!\n"));
#endif
early_termination = true;
goto handle_page_descriptor;
case DESCR_TYPE_VALID4:
next_size = 4;
break;
case DESCR_TYPE_VALID8:
next_size = 8;
break;
}
}
/* Upper level tables */
do {
if (descr_num) { /* if not root pointer */
/* Check protection */
if ((descr_size==8) && (descr[0]&DESCR_S) && !super) {
super_violation = true;
}
if (descr[0]&DESCR_WP) {
write_protected = true;
}
/* Set the updated bit */
if (!level && !(descr[0]&DESCR_U) && !super_violation) {
descr[0] |= DESCR_U;
phys_put_long(descr_addr[descr_num], descr[0]);
}
/* Update status bits */
mmu030.status |= super_violation ? MMUSR_SUPER_VIOLATION : 0;
mmu030.status |= write_protected ? MMUSR_WRITE_PROTECTED : 0;
/* Check if ptest level is reached */
if (level && (level==descr_num)) {
goto stop_search;
}
}
addr_position = (descr_size==4) ? 0 : 1;
table_addr = descr[addr_position]&DESCR_TD_ADDR_MASK;
table_index = (addr&mmu030.translation.table[t].mask)>>mmu030.translation.table[t].shift;
#if MMU030_REG_DBG_MSG
write_log(_T("Table %c at %08X: index = %i, "),table_letter[t],table_addr,table_index);
#endif // MMU030_REG_DBG_MSG
t++; /* Proceed to the next table */
/* Perform limit check */
if (descr_size==8) {
limit = (descr[0]&DESCR_LIMIT_MASK)>>16;
if ((descr[0]&DESCR_LOWER_MASK) && (table_index<limit)) {
mmu030.status |= (MMUSR_LIMIT_VIOLATION|MMUSR_INVALID);
#if MMU030_REG_DBG_MSG
write_log(_T("limit violation (lower limit %i)\n"),limit);
#endif
goto stop_search;
}
if (!(descr[0]&DESCR_LOWER_MASK) && (table_index>limit)) {
mmu030.status |= (MMUSR_LIMIT_VIOLATION|MMUSR_INVALID);
#if MMU030_REG_DBG_MSG
write_log(_T("limit violation (upper limit %i)\n"),limit);
#endif
goto stop_search;
}
}
/* Fetch next descriptor */
descr_num++;
descr_addr[descr_num] = table_addr+(table_index*next_size);
if (next_size==4) {
descr[0] = phys_get_long(descr_addr[descr_num]);
#if MMU030_REG_DBG_MSG
write_log(_T("Next descriptor: %08X\n"),descr[0]);
#endif
} else {
descr[0] = phys_get_long(descr_addr[descr_num]);
descr[1] = phys_get_long(descr_addr[descr_num]+4);
#if MMU030_REG_DBG_MSG
write_log(_T("Next descriptor: %08X%08X\n"),descr[0],descr[1]);
#endif
}
descr_size = next_size;
/* Check descriptor type */
descr_type = descr[0]&DESCR_TYPE_MASK;
switch (descr_type) {
case DESCR_TYPE_INVALID:
#if MMU030_REG_DBG_MSG
write_log(_T("Invalid descriptor!\n"));
#endif
/* stop table walk */
mmu030.status |= MMUSR_INVALID;
goto stop_search;
case DESCR_TYPE_EARLY_TERM:
/* go to last level table handling code */
if (t<=mmu030.translation.last_table) {
#if MMU030_REG_DBG_MSG
write_log(_T("Early termination page descriptor!\n"));
#endif
early_termination = true;
}
goto handle_page_descriptor;
case DESCR_TYPE_VALID4:
next_size = 4;
break;
case DESCR_TYPE_VALID8:
next_size = 8;
break;
}
} while (t<=mmu030.translation.last_table);
/* Handle indirect descriptor */
/* Check if ptest level is reached */
if (level && (level==descr_num)) {
goto stop_search;
}
addr_position = (descr_size==4) ? 0 : 1;
indirect_addr = descr[addr_position]&DESCR_ID_ADDR_MASK;
#if MMU030_REG_DBG_MSG
write_log(_T("Page indirect descriptor at %08X: "),indirect_addr);
#endif
/* Fetch indirect descriptor */
descr_num++;
descr_addr[descr_num] = indirect_addr;
if (next_size==4) {
descr[0] = phys_get_long(descr_addr[descr_num]);
#if MMU030_REG_DBG_MSG
write_log(_T("descr = %08X\n"),descr[0]);
#endif
} else {
descr[0] = phys_get_long(descr_addr[descr_num]);
descr[1] = phys_get_long(descr_addr[descr_num]+4);
#if MMU030_REG_DBG_MSG
write_log(_T("descr = %08X%08X"),descr[0],descr[1]);
#endif
}
descr_size = next_size;
/* Check descriptor type, only page descriptor is valid */
descr_type = descr[0]&DESCR_TYPE_MASK;
if (descr_type!=DESCR_TYPE_PAGE) {
mmu030.status |= MMUSR_INVALID;
goto stop_search;
}
handle_page_descriptor:
if (descr_num) { /* if not root pointer */
/* check protection */
if ((descr_size==8) && (descr[0]&DESCR_S) && !super) {
super_violation = true;
}
if (descr[0]&DESCR_WP) {
write_protected = true;
}
if (!level && !super_violation) {
/* set modified bit */
if (!(descr[0]&DESCR_M) && write && !write_protected) {
descr[0] |= DESCR_M;
descr_modified = true;
}
/* set updated bit */
if (!(descr[0]&DESCR_U)) {
descr[0] |= DESCR_U;
descr_modified = true;
}
/* write modified descriptor if neccessary */
if (descr_modified) {
phys_put_long(descr_addr[descr_num], descr[0]);
}
}
/* update status bits */
mmu030.status |= super_violation ? MMUSR_SUPER_VIOLATION : 0;
mmu030.status |= write_protected ? MMUSR_WRITE_PROTECTED : 0;
/* check if caching is inhibited */
cache_inhibit = descr[0]&DESCR_CI ? true : false;
/* check for the modified bit and set it in the status register */
mmu030.status |= (descr[0]&DESCR_M) ? MMUSR_MODIFIED : 0;
}
/* Check limit using next index field of logical address.
* Limit is only checked on early termination. If we are
* still at root pointer level, only check limit, if FCL
* is disabled. */
if (early_termination) {
if (descr_num || !(tc_030&TC_ENABLE_FCL)) {
if (descr_size==8) {
table_index = (addr&mmu030.translation.table[t].mask)>>mmu030.translation.table[t].shift;
limit = (descr[0]&DESCR_LIMIT_MASK)>>16;
if ((descr[0]&DESCR_LOWER_MASK) && (table_index<limit)) {
mmu030.status |= (MMUSR_LIMIT_VIOLATION|MMUSR_INVALID);
#if MMU030_REG_DBG_MSG
write_log(_T("Limit violation (lower limit %i)\n"),limit);
#endif
goto stop_search;
}
if (!(descr[0]&DESCR_LOWER_MASK) && (table_index>limit)) {
mmu030.status |= (MMUSR_LIMIT_VIOLATION|MMUSR_INVALID);
#if MMU030_REG_DBG_MSG
write_log(_T("Limit violation (upper limit %i)\n"),limit);
#endif
goto stop_search;
}
}
}
/* Get all unused bits of the logical address table index field.
* they are added to the page address */
/* TODO: They should be added via "unsigned addition". How to? */
do {
unused_fields_mask |= mmu030.translation.table[t].mask;
t++;
} while (t<=mmu030.translation.last_table);
page_addr = addr&unused_fields_mask;
#if MMU030_REG_DBG_MSG
write_log(_T("Logical address unused bits: %08X (mask = %08X)\n"),
page_addr,unused_fields_mask);
#endif
}
/* Get page address */
addr_position = (descr_size==4) ? 0 : 1;
page_addr += (descr[addr_position]&DESCR_PD_ADDR_MASK);
#if MMU030_REG_DBG_MSG
write_log(_T("Page at %08X\n"),page_addr);
#endif // MMU030_REG_DBG_MSG
stop_search:
; /* Make compiler happy */
} CATCH(prb) {
/* We jump to this place, if a bus error occured during table search.
* bBusErrorReadWrite is set in m68000.c, M68000_BusError: read = 1 */
if (bBusErrorReadWrite) {
descr_num--;
}
mmu030.status |= (MMUSR_BUS_ERROR|MMUSR_INVALID);
write_log(_T("MMU: Bus error while %s descriptor!\n"),
bBusErrorReadWrite?_T("reading"):_T("writing"));
} ENDTRY
/* check if we have to handle ptest */
if (level) {
/* Note: wp, m and sv bits are undefined if the invalid bit is set */
mmu030.status = (mmu030.status&~MMUSR_NUM_LEVELS_MASK) | descr_num;
/* If root pointer is page descriptor (descr_num 0), return 0 */
return descr_num ? descr_addr[descr_num] : 0;
}
/* Find an ATC entry to replace */
/* Search for invalid entry */
for (i=0; i<ATC030_NUM_ENTRIES; i++) {
if (!mmu030.atc[i].logical.valid) {
break;
}
}
/* If there are no invalid entries, replace first entry
* with history bit not set */
if (i == ATC030_NUM_ENTRIES) {
for (i=0; i<ATC030_NUM_ENTRIES; i++) {
if (!mmu030.atc[i].mru) {
break;
}
}
#if MMU030_REG_DBG_MSG
write_log(_T("ATC is full. Replacing entry %i\n"), i);
#endif
}
if (i >= ATC030_NUM_ENTRIES) {
i = 0;
write_log (_T("ATC entry not found!!!\n"));
}
mmu030_atc_handle_history_bit(i);
/* Create ATC entry */
mmu030.atc[i].logical.addr = addr & mmu030.translation.page.imask; /* delete page index bits */
mmu030.atc[i].logical.fc = fc;
mmu030.atc[i].logical.valid = true;
mmu030.atc[i].physical.addr = page_addr & mmu030.translation.page.imask; /* delete page index bits */
if ((mmu030.status&MMUSR_INVALID) || (mmu030.status&MMUSR_SUPER_VIOLATION)) {
mmu030.atc[i].physical.bus_error = true;
} else {
mmu030.atc[i].physical.bus_error = false;
}
mmu030.atc[i].physical.cache_inhibit = cache_inhibit;
mmu030.atc[i].physical.modified = (mmu030.status&MMUSR_MODIFIED) ? true : false;
mmu030.atc[i].physical.write_protect = (mmu030.status&MMUSR_WRITE_PROTECTED) ? true : false;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC create entry(%i): logical = %08X, physical = %08X, FC = %i\n"), i,
mmu030.atc[i].logical.addr, mmu030.atc[i].physical.addr,
mmu030.atc[i].logical.fc);
write_log(_T("ATC create entry(%i): B = %i, CI = %i, WP = %i, M = %i\n"), i,
mmu030.atc[i].physical.bus_error?1:0,
mmu030.atc[i].physical.cache_inhibit?1:0,
mmu030.atc[i].physical.write_protect?1:0,
mmu030.atc[i].physical.modified?1:0);
#endif // MMU030_ATC_DBG_MSG
return 0;
}
/* This function is used for PTEST level 0. */
void mmu030_ptest_atc_search(uaecptr logical_addr, uae_u32 fc, bool write) {
int i;
mmu030.status = 0;
if (mmu030_match_ttr(logical_addr, fc, write)&TT_OK_MATCH) {
mmu030.status |= MMUSR_TRANSP_ACCESS;
return;
}
for (i = 0; i < ATC030_NUM_ENTRIES; i++) {
if ((mmu030.atc[i].logical.fc == fc) &&
(mmu030.atc[i].logical.addr == logical_addr) &&
mmu030.atc[i].logical.valid) {
break;
}
}
if (i==ATC030_NUM_ENTRIES) {
mmu030.status |= MMUSR_INVALID;
return;
}
mmu030.status |= mmu030.atc[i].physical.bus_error ? (MMUSR_BUS_ERROR|MMUSR_INVALID) : 0;
/* Note: write protect and modified bits are undefined if the invalid bit is set */
mmu030.status |= mmu030.atc[i].physical.write_protect ? MMUSR_WRITE_PROTECTED : 0;
mmu030.status |= mmu030.atc[i].physical.modified ? MMUSR_MODIFIED : 0;
}
/* This function is used for PTEST level 1 - 7. */
uae_u32 mmu030_ptest_table_search(uaecptr logical_addr, uae_u32 fc, bool write, int level) {
if (mmu030_match_ttr(logical_addr, fc, write)&TT_OK_MATCH) {
return 0;
} else {
return mmu030_table_search(logical_addr, fc, write, level);
}
}
/* Address Translation Cache
*
* The ATC uses a pseudo-least-recently-used algorithm to keep track of
* least recently used entries. They are replaced if the cache is full.
* An internal history-bit (MRU-bit) is used to identify these entries.
* If an entry is accessed, its history-bit is set to 1. If after that
* there are no more entries with zero-bits, all other history-bits are
* set to 0. When no more invalid entries are in the ATC, the first entry
* with a zero-bit is replaced.
*
*
* Logical Portion (28 bit):
* oooo ---- xxxx xxxx xxxx xxxx xxxx xxxx
* logical address (most significant 24 bit)
*
* oooo -xxx ---- ---- ---- ---- ---- ----
* function code
*
* oooo x--- ---- ---- ---- ---- ---- ----
* valid
*
*
* Physical Portion (28 bit):
* oooo ---- xxxx xxxx xxxx xxxx xxxx xxxx
* physical address
*
* oooo ---x ---- ---- ---- ---- ---- ----
* modified
*
* oooo --x- ---- ---- ---- ---- ---- ----
* write protect
*
* oooo -x-- ---- ---- ---- ---- ---- ----
* cache inhibit
*
* oooo x--- ---- ---- ---- ---- ---- ----
* bus error
*
*/
#define ATC030_MASK 0x0FFFFFFF
#define ATC030_ADDR_MASK 0x00FFFFFF /* after masking shift 8 (<< 8) */
#define ATC030_LOG_FC 0x07000000
#define ATC030_LOG_V 0x08000000
#define ATC030_PHYS_M 0x01000000
#define ATC030_PHYS_WP 0x02000000
#define ATC030_PHYS_CI 0x04000000
#define ATC030_PHYS_BE 0x08000000
void mmu030_page_fault(uaecptr addr, bool read, int flags, uae_u32 fc) {
regs.mmu_fault_addr = addr;
regs.mmu_ssw = (fc & 1) ? MMU030_SSW_DF | (MMU030_SSW_DF << 1) : (MMU030_SSW_FB | MMU030_SSW_RB);
regs.mmu_ssw |= read ? MMU030_SSW_RW : 0;
regs.mmu_ssw |= flags;
regs.mmu_ssw |= fc;
bBusErrorReadWrite = read;
mm030_stageb_address = addr;
#if MMUDEBUG
write_log(_T("MMU: page fault (logical addr=%08X SSW=%04x read=%d size=%d fc=%d pc=%08x ob=%08x ins=%04X)\n"),
addr, regs.mmu_ssw, read, (flags & MMU030_SSW_SIZE_B) ? 1 : (flags & MMU030_SSW_SIZE_W) ? 2 : 4, fc,
regs.instruction_pc, (mmu030_state[1] & MMU030_STATEFLAG1_MOVEM1) ? mmu030_data_buffer : mmu030_ad[mmu030_idx].val, mmu030_opcode & 0xffff);
#endif
// extern void activate_debugger(void);
// activate_debugger ();
THROW(2);
}
void mmu030_put_long_atc(uaecptr addr, uae_u32 val, int l, uae_u32 fc) {
uae_u32 page_index = addr & mmu030.translation.page.mask;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 physical_addr = mmu030.atc[l].physical.addr&addr_mask;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC match(%i): page addr = %08X, index = %08X (lput %08X)\n"),
l, physical_addr, page_index, val);
#endif
physical_addr += page_index;
if (mmu030.atc[l].physical.bus_error || mmu030.atc[l].physical.write_protect) {
mmu030_page_fault(addr, false, MMU030_SSW_SIZE_L, fc);
return;
}
x_phys_put_long(physical_addr, val);
}
void mmu030_put_word_atc(uaecptr addr, uae_u16 val, int l, uae_u32 fc) {
uae_u32 page_index = addr & mmu030.translation.page.mask;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 physical_addr = mmu030.atc[l].physical.addr&addr_mask;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC match(%i): page addr = %08X, index = %08X (wput %04X)\n"),
l, physical_addr, page_index, val);
#endif
physical_addr += page_index;
if (mmu030.atc[l].physical.bus_error || mmu030.atc[l].physical.write_protect) {
mmu030_page_fault(addr, false, MMU030_SSW_SIZE_W, fc);
return;
}
x_phys_put_word(physical_addr, val);
}
void mmu030_put_byte_atc(uaecptr addr, uae_u8 val, int l, uae_u32 fc) {
uae_u32 page_index = addr & mmu030.translation.page.mask;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 physical_addr = mmu030.atc[l].physical.addr&addr_mask;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC match(%i): page addr = %08X, index = %08X (bput %02X)\n"),
l, physical_addr, page_index, val);
#endif
physical_addr += page_index;
if (mmu030.atc[l].physical.bus_error || mmu030.atc[l].physical.write_protect) {
mmu030_page_fault(addr, false, MMU030_SSW_SIZE_B, fc);
return;
}
x_phys_put_byte(physical_addr, val);
}
uae_u32 mmu030_get_long_atc(uaecptr addr, int l, uae_u32 fc) {
uae_u32 page_index = addr & mmu030.translation.page.mask;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 physical_addr = mmu030.atc[l].physical.addr&addr_mask;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC match(%i): page addr = %08X, index = %08X (lget %08X)\n"), l,
physical_addr, page_index, phys_get_long(physical_addr+page_index));
#endif
physical_addr += page_index;
if (mmu030.atc[l].physical.bus_error) {
mmu030_page_fault(addr, true, MMU030_SSW_SIZE_L, fc);
return 0;
}
return x_phys_get_long(physical_addr);
}
uae_u32 mmu030_get_ilong_atc(uaecptr addr, int l, uae_u32 fc) {
uae_u32 page_index = addr & mmu030.translation.page.mask;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 physical_addr = mmu030.atc[l].physical.addr&addr_mask;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC match(%i): page addr = %08X, index = %08X (lget %08X)\n"), l,
physical_addr, page_index, phys_get_long(physical_addr + page_index));
#endif
physical_addr += page_index;
if (mmu030.atc[l].physical.bus_error) {
mmu030_page_fault(addr, true, MMU030_SSW_SIZE_L, fc);
return 0;
}
return x_phys_get_ilong(physical_addr);
}
uae_u16 mmu030_get_word_atc(uaecptr addr, int l, uae_u32 fc) {
uae_u32 page_index = addr & mmu030.translation.page.mask;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 physical_addr = mmu030.atc[l].physical.addr&addr_mask;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC match(%i): page addr = %08X, index = %08X (wget %04X)\n"), l,
physical_addr, page_index, phys_get_word(physical_addr+page_index));
#endif
physical_addr += page_index;
if (mmu030.atc[l].physical.bus_error) {
mmu030_page_fault(addr, true, MMU030_SSW_SIZE_W, fc);
return 0;
}
return x_phys_get_word(physical_addr);
}
uae_u16 mmu030_get_iword_atc(uaecptr addr, int l, uae_u32 fc) {
uae_u32 page_index = addr & mmu030.translation.page.mask;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 physical_addr = mmu030.atc[l].physical.addr&addr_mask;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC match(%i): page addr = %08X, index = %08X (wget %04X)\n"), l,
physical_addr, page_index, phys_get_word(physical_addr + page_index));
#endif
physical_addr += page_index;
if (mmu030.atc[l].physical.bus_error) {
mmu030_page_fault(addr, true, MMU030_SSW_SIZE_W, fc);
return 0;
}
return x_phys_get_iword(physical_addr);
}
uae_u8 mmu030_get_byte_atc(uaecptr addr, int l, uae_u32 fc) {
uae_u32 page_index = addr & mmu030.translation.page.mask;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 physical_addr = mmu030.atc[l].physical.addr&addr_mask;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC match(%i): page addr = %08X, index = %08X (bget %02X)\n"), l,
physical_addr, page_index, phys_get_byte(physical_addr+page_index));
#endif
physical_addr += page_index;
if (mmu030.atc[l].physical.bus_error) {
mmu030_page_fault(addr, true, MMU030_SSW_SIZE_B, fc);
return 0;
}
return x_phys_get_byte(physical_addr);
}
/* Generic versions of above */
void mmu030_put_atc_generic(uaecptr addr, uae_u32 val, int l, uae_u32 fc, int size, int flags) {
uae_u32 page_index = addr & mmu030.translation.page.mask;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 physical_addr = mmu030.atc[l].physical.addr & addr_mask;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC match(%i): page addr = %08X, index = %08X (bput %02X)\n"),
l, physical_addr, page_index, val);
#endif
physical_addr += page_index;
if (mmu030.atc[l].physical.write_protect || mmu030.atc[l].physical.bus_error) {
mmu030_page_fault(addr, false, flags, fc);
return;
}
if (size == sz_byte)
x_phys_put_byte(physical_addr, val);
else if (size == sz_word)
x_phys_put_word(physical_addr, val);
else
x_phys_put_long(physical_addr, val);
}
uae_u32 mmu030_get_atc_generic(uaecptr addr, int l, uae_u32 fc, int size, int flags, bool checkwrite) {
uae_u32 page_index = addr & mmu030.translation.page.mask;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 physical_addr = mmu030.atc[l].physical.addr & addr_mask;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC match(%i): page addr = %08X, index = %08X (bget %02X)\n"), l,
physical_addr, page_index, phys_get_byte(physical_addr+page_index));
#endif
physical_addr += page_index;
if (mmu030.atc[l].physical.bus_error || (checkwrite && mmu030.atc[l].physical.write_protect)) {
mmu030_page_fault(addr, true, flags, fc);
return 0;
}
if (size == sz_byte)
return x_phys_get_byte(physical_addr);
else if (size == sz_word)
return x_phys_get_word(physical_addr);
return x_phys_get_long(physical_addr);
}
/* This function checks if a certain logical address is in the ATC
* by comparing the logical address and function code to the values
* stored in the ATC entries. If a matching entry is found it sets
* the history bit and returns the cache index of the entry. */
int mmu030_logical_is_in_atc(uaecptr addr, uae_u32 fc, bool write) {
uaecptr logical_addr = 0;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 maddr = addr & addr_mask;
int offset = (maddr >> mmu030.translation.page.size) & 0x1f;
int i, index;
index = atcindextable[offset];
for (i=0; i<ATC030_NUM_ENTRIES; i++) {
logical_addr = mmu030.atc[index].logical.addr;
/* If actual address matches address in ATC */
if (maddr==(logical_addr&addr_mask) &&
(mmu030.atc[index].logical.fc==fc) &&
mmu030.atc[index].logical.valid) {
/* If access is valid write and M bit is not set, invalidate entry
* else return index */
if (!write || mmu030.atc[index].physical.modified ||
mmu030.atc[index].physical.write_protect ||
mmu030.atc[index].physical.bus_error) {
/* Maintain history bit */
mmu030_atc_handle_history_bit(index);
atcindextable[offset] = index;
return index;
} else {
mmu030.atc[index].logical.valid = false;
}
}
index++;
if (index >= ATC030_NUM_ENTRIES)
index = 0;
}
return -1;
}
void mmu030_atc_handle_history_bit(int entry_num) {
int j;
mmu030.atc[entry_num].mru = 1;
for (j=0; j<ATC030_NUM_ENTRIES; j++) {
if (!mmu030.atc[j].mru)
break;
}
/* If there are no more zero-bits, reset all */
if (j==ATC030_NUM_ENTRIES) {
for (j=0; j<ATC030_NUM_ENTRIES; j++) {
mmu030.atc[j].mru = 0;
}
mmu030.atc[entry_num].mru = 1;
#if MMU030_ATC_DBG_MSG
write_log(_T("ATC: No more history zero-bits. Reset all.\n"));
#endif
}
}
/* Memory access functions:
* If the address matches one of the transparent translation registers
* use it directly as physical address, else check ATC for the
* logical address. If the logical address is not resident in the ATC
* create a new ATC entry and then look up the physical address.
*/
void mmu030_put_long(uaecptr addr, uae_u32 val, uae_u32 fc) {
// addr,super,write
if ((!mmu030.enabled) || (mmu030_match_ttr_access(addr,fc,true)) || (fc==7)) {
x_phys_put_long(addr,val);
return;
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, true);
if (atc_line_num>=0) {
mmu030_put_long_atc(addr, val, atc_line_num, fc);
} else {
mmu030_table_search(addr,fc,true,0);
mmu030_put_long_atc(addr, val, mmu030_logical_is_in_atc(addr,fc,true), fc);
}
}
void mmu030_put_word(uaecptr addr, uae_u16 val, uae_u32 fc) {
// addr,super,write
if ((!mmu030.enabled) || (mmu030_match_ttr_access(addr,fc,true)) || (fc==7)) {
x_phys_put_word(addr,val);
return;
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, true);
if (atc_line_num>=0) {
mmu030_put_word_atc(addr, val, atc_line_num, fc);
} else {
mmu030_table_search(addr, fc, true, 0);
mmu030_put_word_atc(addr, val, mmu030_logical_is_in_atc(addr,fc,true), fc);
}
}
void mmu030_put_byte(uaecptr addr, uae_u8 val, uae_u32 fc) {
// addr,super,write
if ((!mmu030.enabled) || (mmu030_match_ttr_access(addr, fc, true)) || (fc==7)) {
x_phys_put_byte(addr,val);
return;
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, true);
if (atc_line_num>=0) {
mmu030_put_byte_atc(addr, val, atc_line_num, fc);
} else {
mmu030_table_search(addr, fc, true, 0);
mmu030_put_byte_atc(addr, val, mmu030_logical_is_in_atc(addr,fc,true), fc);
}
}
uae_u32 mmu030_get_ilong(uaecptr addr, uae_u32 fc) {
// addr,super,write
if ((!mmu030.enabled) || (mmu030_match_ttr_access(addr, fc, false)) || (fc == 7)) {
return x_phys_get_ilong(addr);
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, false);
if (atc_line_num >= 0) {
return mmu030_get_ilong_atc(addr, atc_line_num, fc);
}
else {
mmu030_table_search(addr, fc, false, 0);
return mmu030_get_ilong_atc(addr, mmu030_logical_is_in_atc(addr, fc, false), fc);
}
}
uae_u32 mmu030_get_long(uaecptr addr, uae_u32 fc) {
// addr,super,write
if ((!mmu030.enabled) || (mmu030_match_ttr_access(addr,fc,false)) || (fc==7)) {
return phys_get_long(addr);
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, false);
if (atc_line_num>=0) {
return mmu030_get_long_atc(addr, atc_line_num, fc);
} else {
mmu030_table_search(addr, fc, false, 0);
return mmu030_get_long_atc(addr, mmu030_logical_is_in_atc(addr,fc,false), fc);
}
}
uae_u16 mmu030_get_iword(uaecptr addr, uae_u32 fc) {
// addr,super,write
if ((!mmu030.enabled) || (mmu030_match_ttr_access(addr, fc, false)) || (fc == 7)) {
return x_phys_get_iword(addr);
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, false);
if (atc_line_num >= 0) {
return mmu030_get_iword_atc(addr, atc_line_num, fc);
}
else {
mmu030_table_search(addr, fc, false, 0);
return mmu030_get_iword_atc(addr, mmu030_logical_is_in_atc(addr, fc, false), fc);
}
}
uae_u16 mmu030_get_word(uaecptr addr, uae_u32 fc) {
// addr,super,write
if ((!mmu030.enabled) || (mmu030_match_ttr_access(addr,fc,false)) || (fc==7)) {
return phys_get_word(addr);
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, false);
if (atc_line_num>=0) {
return mmu030_get_word_atc(addr, atc_line_num, fc);
} else {
mmu030_table_search(addr, fc, false, 0);
return mmu030_get_word_atc(addr, mmu030_logical_is_in_atc(addr,fc,false), fc);
}
}
uae_u8 mmu030_get_byte(uaecptr addr, uae_u32 fc) {
// addr,super,write
if ((!mmu030.enabled) || (mmu030_match_ttr_access(addr,fc,false)) || (fc==7)) {
return x_phys_get_byte(addr);
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, false);
if (atc_line_num>=0) {
return mmu030_get_byte_atc(addr, atc_line_num, fc);
} else {
mmu030_table_search(addr, fc, false, 0);
return mmu030_get_byte_atc(addr, mmu030_logical_is_in_atc(addr,fc,false), fc);
}
}
/* Not commonly used access function */
void mmu030_put_generic(uaecptr addr, uae_u32 val, uae_u32 fc, int size, int accesssize, int flags) {
// addr,super,write
if ((!mmu030.enabled) || (mmu030_match_ttr_access(addr, fc, true)) || (fc==7)) {
if (size == sz_byte)
x_phys_put_byte(addr, val);
else if (size == sz_word)
x_phys_put_word(addr, val);
else
x_phys_put_long(addr, val);
return;
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, true);
if (atc_line_num>=0) {
mmu030_put_atc_generic(addr, val, atc_line_num, fc, size, flags);
} else {
mmu030_table_search(addr, fc, true, 0);
atc_line_num = mmu030_logical_is_in_atc(addr, fc, true);
if (accesssize == sz_byte)
flags |= MMU030_SSW_SIZE_B;
else if (accesssize == sz_word)
flags |= MMU030_SSW_SIZE_W;
mmu030_put_atc_generic(addr, val, atc_line_num, fc, size, flags);
}
}
static uae_u32 mmu030_get_generic_lrmw(uaecptr addr, uae_u32 fc, int size, int accesssize, int flags) {
// addr,super,write
if ((!mmu030.enabled) || (mmu030_match_lrmw_ttr_access(addr,fc)) || (fc==7)) {
if (size == sz_byte)
return phys_get_byte(addr);
else if (size == sz_word)
return phys_get_word(addr);
return phys_get_long(addr);
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, true);
if (atc_line_num>=0) {
return mmu030_get_atc_generic(addr, atc_line_num, fc, size, flags, true);
} else {
mmu030_table_search(addr, fc, true, 0);
atc_line_num = mmu030_logical_is_in_atc(addr, fc, true);
if (accesssize == sz_byte)
flags |= MMU030_SSW_SIZE_B;
else if (accesssize == sz_word)
flags |= MMU030_SSW_SIZE_W;
return mmu030_get_atc_generic(addr, atc_line_num, fc, size, flags, true);
}
}
uae_u32 mmu030_get_generic(uaecptr addr, uae_u32 fc, int size, int accesssize, int flags) {
if (flags & MMU030_SSW_RM) {
return mmu030_get_generic_lrmw(addr, fc, size, accesssize, flags);
}
// addr,super,write
if ((!mmu030.enabled) || (mmu030_match_ttr_access(addr,fc,false)) || (fc==7)) {
if (size == sz_byte)
return phys_get_byte(addr);
else if (size == sz_word)
return phys_get_word(addr);
return phys_get_long(addr);
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, false);
if (atc_line_num>=0) {
return mmu030_get_atc_generic(addr, atc_line_num, fc, size, flags, false);
} else {
mmu030_table_search(addr, fc, false, 0);
atc_line_num = mmu030_logical_is_in_atc(addr, fc, false);
if (accesssize == sz_byte)
flags |= MMU030_SSW_SIZE_B;
else if (accesssize == sz_word)
flags |= MMU030_SSW_SIZE_W;
return mmu030_get_atc_generic(addr, atc_line_num, fc, size, flags, false);
}
}
/* Locked RMW is rarely used */
uae_u32 uae_mmu030_get_lrmw(uaecptr addr, int size)
{
uae_u32 fc = (regs.s ? 4 : 0) | 1;
if (size == sz_byte) {
return mmu030_get_generic(addr, fc, size, size, MMU030_SSW_RM);
} else if (size == sz_word) {
if (unlikely(is_unaligned(addr, 2)))
return mmu030_get_word_unaligned(addr, fc, MMU030_SSW_RM);
else
return mmu030_get_generic(addr, fc, size, size, MMU030_SSW_RM);
} else {
if (unlikely(is_unaligned(addr, 4)))
return mmu030_get_long_unaligned(addr, fc, MMU030_SSW_RM);
else
return mmu030_get_generic(addr, fc, size, size, MMU030_SSW_RM);
}
}
void uae_mmu030_put_lrmw(uaecptr addr, uae_u32 val, int size)
{
uae_u32 fc = (regs.s ? 4 : 0) | 1;
if (size == sz_byte) {
mmu030_put_generic(addr, val, fc, size, size, MMU030_SSW_RM);
} else if (size == sz_word) {
if (unlikely(is_unaligned(addr, 2)))
mmu030_put_word_unaligned(addr, val, fc, MMU030_SSW_RM);
else
mmu030_put_generic(addr, val, fc, size, size, MMU030_SSW_RM);
} else {
if (unlikely(is_unaligned(addr, 4)))
mmu030_put_long_unaligned(addr, val, fc, MMU030_SSW_RM);
else
mmu030_put_generic(addr, val, fc, size, size, MMU030_SSW_RM);
}
}
uae_u16 REGPARAM2 mmu030_get_word_unaligned(uaecptr addr, uae_u32 fc, int flags)
{
uae_u16 res;
res = (uae_u16)mmu030_get_generic(addr, fc, sz_byte, sz_word, flags) << 8;
SAVE_EXCEPTION;
TRY(prb) {
res |= mmu030_get_generic(addr + 1, fc, sz_byte, sz_word, flags);
RESTORE_EXCEPTION;
}
CATCH(prb) {
RESTORE_EXCEPTION;
THROW_AGAIN(prb);
} ENDTRY
return res;
}
uae_u32 REGPARAM2 mmu030_get_ilong_unaligned(uaecptr addr, uae_u32 fc, int flags)
{
uae_u32 res;
res = (uae_u32)mmu030_get_iword(addr, fc) << 16;
SAVE_EXCEPTION;
TRY(prb) {
res |= mmu030_get_iword(addr + 2, fc);
RESTORE_EXCEPTION;
}
CATCH(prb) {
RESTORE_EXCEPTION;
THROW_AGAIN(prb);
} ENDTRY
return res;
}
uae_u32 REGPARAM2 mmu030_get_long_unaligned(uaecptr addr, uae_u32 fc, int flags)
{
uae_u32 res;
if (likely(!(addr & 1))) {
res = (uae_u32)mmu030_get_generic(addr, fc, sz_word, sz_long, flags) << 16;
SAVE_EXCEPTION;
TRY(prb) {
res |= mmu030_get_generic(addr + 2, fc, sz_word, sz_long, flags);
RESTORE_EXCEPTION;
}
CATCH(prb) {
RESTORE_EXCEPTION;
THROW_AGAIN(prb);
} ENDTRY
} else {
res = (uae_u32)mmu030_get_generic(addr, fc, sz_byte, sz_long, flags) << 8;
SAVE_EXCEPTION;
TRY(prb) {
res = (res | mmu030_get_generic(addr + 1, fc, sz_byte, sz_long, flags)) << 8;
res = (res | mmu030_get_generic(addr + 2, fc, sz_byte, sz_long, flags)) << 8;
res |= mmu030_get_generic(addr + 3, fc, sz_byte, sz_long, flags);
RESTORE_EXCEPTION;
}
CATCH(prb) {
RESTORE_EXCEPTION;
THROW_AGAIN(prb);
} ENDTRY
}
return res;
}
void REGPARAM2 mmu030_put_long_unaligned(uaecptr addr, uae_u32 val, uae_u32 fc, int flags)
{
SAVE_EXCEPTION;
TRY(prb) {
if (likely(!(addr & 1))) {
mmu030_put_generic(addr, val >> 16, fc, sz_word, sz_long, flags);
mmu030_put_generic(addr + 2, val, fc, sz_word, sz_long, flags);
} else {
mmu030_put_generic(addr, val >> 24, fc, sz_byte, sz_long, flags);
mmu030_put_generic(addr + 1, val >> 16, fc, sz_byte, sz_long, flags);
mmu030_put_generic(addr + 2, val >> 8, fc, sz_byte, sz_long, flags);
mmu030_put_generic(addr + 3, val, fc, sz_byte, sz_long, flags);
}
RESTORE_EXCEPTION;
}
CATCH(prb) {
RESTORE_EXCEPTION;
regs.wb3_data = val;
THROW_AGAIN(prb);
} ENDTRY
}
void REGPARAM2 mmu030_put_word_unaligned(uaecptr addr, uae_u16 val, uae_u32 fc, int flags)
{
SAVE_EXCEPTION;
TRY(prb) {
mmu030_put_generic(addr, val >> 8, fc, sz_byte, sz_word, flags);
mmu030_put_generic(addr + 1, val, fc, sz_byte, sz_word, flags);
RESTORE_EXCEPTION;
}
CATCH(prb) {
RESTORE_EXCEPTION;
regs.wb3_data = val;
THROW_AGAIN(prb);
} ENDTRY
}
/* Used by debugger */
static uaecptr mmu030_get_addr_atc(uaecptr addr, int l, uae_u32 fc, bool write) {
uae_u32 page_index = addr & mmu030.translation.page.mask;
uae_u32 addr_mask = mmu030.translation.page.imask;
uae_u32 physical_addr = mmu030.atc[l].physical.addr&addr_mask;
physical_addr += page_index;
if (mmu030.atc[l].physical.bus_error || (write && mmu030.atc[l].physical.write_protect)) {
mmu030_page_fault(addr, write == 0, MMU030_SSW_SIZE_B, fc);
return 0;
}
return physical_addr;
}
uaecptr mmu030_translate(uaecptr addr, bool super, bool data, bool write)
{
int fc = (super ? 4 : 0) | (data ? 1 : 2);
if ((!mmu030.enabled) || (mmu030_match_ttr(addr,fc,write)&TT_OK_MATCH) || (fc==7)) {
return addr;
}
int atc_line_num = mmu030_logical_is_in_atc(addr, fc, write);
if (atc_line_num>=0) {
return mmu030_get_addr_atc(addr, atc_line_num, fc, write);
} else {
mmu030_table_search(addr, fc, false, 0);
return mmu030_get_addr_atc(addr, mmu030_logical_is_in_atc(addr,fc,write), fc, write);
}
}
static uae_u32 get_dcache_byte(uaecptr addr)
{
return read_dcache030(addr, 0);
}
static uae_u32 get_dcache_word(uaecptr addr)
{
return read_dcache030(addr, 1);
}
static uae_u32 get_dcache_long(uaecptr addr)
{
return read_dcache030(addr, 2);
}
static void put_dcache_byte(uaecptr addr, uae_u32 v)
{
write_dcache030(addr, v, 0);
}
static void put_dcache_word(uaecptr addr, uae_u32 v)
{
write_dcache030(addr, v, 1);
}
static void put_dcache_long(uaecptr addr, uae_u32 v)
{
write_dcache030(addr, v, 2);
}
/* MMU Reset */
void mmu030_reset(int hardreset)
{
/* A CPU reset causes the E-bits of TC and TT registers to be zeroed. */
mmu030.enabled = false;
regs.mmu_page_size = 0;
tc_030 &= ~TC_ENABLE_TRANSLATION;
tt0_030 &= ~TT_ENABLE;
tt1_030 &= ~TT_ENABLE;
if (hardreset) {
srp_030 = crp_030 = 0;
tt0_030 = tt1_030 = tc_030 = 0;
mmusr_030 = 0;
mmu030_flush_atc_all();
}
if (currprefs.cpu_cycle_exact || currprefs.cpu_compatible) {
x_phys_get_iword = get_word_icache030;
x_phys_get_ilong = get_long_icache030;
x_phys_get_byte = get_dcache_byte;
x_phys_get_word = get_dcache_word;
x_phys_get_long = get_dcache_long;
x_phys_put_byte = put_dcache_byte;
x_phys_put_word = put_dcache_word;
x_phys_put_long = put_dcache_long;
} else {
x_phys_get_iword = phys_get_word;
x_phys_get_ilong = phys_get_long;
x_phys_get_byte = phys_get_byte;
x_phys_get_word = phys_get_word;
x_phys_get_long = phys_get_long;
x_phys_put_byte = phys_put_byte;
x_phys_put_word = phys_put_word;
x_phys_put_long = phys_put_long;
}
}
void m68k_do_rte_mmu030 (uaecptr a7)
{
// Restore access error exception state
uae_u16 format = get_word_mmu030 (a7 + 6);
uae_u16 frame = format >> 12;
uae_u16 ssw = get_word_mmu030 (a7 + 10);
// Fetch last word, real CPU does it to allow OS bus handler to map
// the page if frame crosses pages and following page is not resident.
if (frame == 0xb)
get_word_mmu030(a7 + 92 - 2);
else
get_word_mmu030(a7 + 32 - 2);
// Internal register, our opcode storage area
mmu030_opcode = get_long_mmu030 (a7 + 0x14);
// Misc state data
mmu030_state[0] = get_word_mmu030 (a7 + 0x30);
mmu030_state[1] = get_word_mmu030 (a7 + 0x32);
mmu030_state[2] = get_word_mmu030 (a7 + 0x34);
mmu030_disp_store[0] = get_long_mmu030 (a7 + 0x1c);
mmu030_disp_store[1] = get_long_mmu030 (a7 + 0x1c + 4);
if (mmu030_state[1] & MMU030_STATEFLAG1_FMOVEM) {
mmu030_fmovem_store[0] = get_long_mmu030 (a7 + 0x5c - (7 + 1) * 4);
mmu030_fmovem_store[1] = get_long_mmu030 (a7 + 0x5c - (8 + 1) * 4);
}
// Rerun "mmu030_opcode" using restored state.
mmu030_retry = true;
if (frame == 0xb) {
uae_u16 idxsize = get_word_mmu030 (a7 + 0x36);
for (int i = 0; i < idxsize + 1; i++) {
mmu030_ad[i].done = i < idxsize;
mmu030_ad[i].val = get_long_mmu030 (a7 + 0x5c - (i + 1) * 4);
}
mmu030_ad[idxsize + 1].done = false;
// did we have data fault but DF bit cleared?
if (ssw & (MMU030_SSW_DF << 1) && !(ssw & MMU030_SSW_DF)) {
// DF not set: mark access as done
if (ssw & MMU030_SSW_RM) {
// Read-Modify-Write: whole instruction is considered done
write_log (_T("Read-Modify-Write and DF bit cleared! PC=%08x\n"), regs.instruction_pc);
mmu030_retry = false;
} else if (mmu030_state[1] & MMU030_STATEFLAG1_MOVEM1) {
// if movem, skip next move
mmu030_data_buffer = get_long_mmu030 (a7 + 0x2c);
mmu030_state[1] |= MMU030_STATEFLAG1_MOVEM2;
} else {
mmu030_ad[idxsize].done = true;
if (ssw & MMU030_SSW_RW) {
// Read and no DF: use value in data input buffer
mmu030_data_buffer = get_long_mmu030 (a7 + 0x2c);
mmu030_ad[idxsize].val = mmu030_data_buffer;
}
}
}
// did we have ins fault and RB bit cleared?
if ((ssw & MMU030_SSW_FB) && !(ssw & MMU030_SSW_RB)) {
uae_u16 stageb = get_word_mmu030 (a7 + 0x0e);
if (mmu030_opcode == -1) {
mmu030_opcode_stageb = stageb;
write_log (_T("Software fixed stage B! opcode = %04x\n"), stageb);
} else {
mmu030_ad[idxsize].done = true;
mmu030_ad[idxsize].val = stageb;
write_log (_T("Software fixed stage B! opcode = %04X, opword = %04x\n"), mmu030_opcode, stageb);
}
}
m68k_areg (regs, 7) += 92;
} else {
m68k_areg (regs, 7) += 32;
}
}
void flush_mmu030 (uaecptr addr, int n)
{
}
void m68k_do_rts_mmu030 (void)
{
m68k_setpc (get_long_mmu030_state (m68k_areg (regs, 7)));
m68k_areg (regs, 7) += 4;
}
void m68k_do_bsr_mmu030 (uaecptr oldpc, uae_s32 offset)
{
put_long_mmu030_state (m68k_areg (regs, 7) - 4, oldpc);
m68k_areg (regs, 7) -= 4;
m68k_incpci (offset);
}
uae_u32 REGPARAM2 get_disp_ea_020_mmu030 (uae_u32 base, int idx)
{
uae_u16 dp;
int reg;
uae_u32 v;
int oldidx;
int pcadd = 0;
// we need to do this hack here because in worst case we don't have enough
// stack frame space to store two very large 020 addressing mode access state
// + whatever the instruction itself does.
if (mmu030_state[1] & (1 << idx)) {
m68k_incpci (((mmu030_state[2] >> (idx * 4)) & 15) * 2);
return mmu030_disp_store[idx];
}
oldidx = mmu030_idx;
dp = next_iword_mmu030_state ();
pcadd += 1;
reg = (dp >> 12) & 15;
uae_s32 regd = regs.regs[reg];
if ((dp & 0x800) == 0)
regd = (uae_s32)(uae_s16)regd;
regd <<= (dp >> 9) & 3;
if (dp & 0x100) {
uae_s32 outer = 0;
if (dp & 0x80)
base = 0;
if (dp & 0x40)
regd = 0;
if ((dp & 0x30) == 0x20) {
base += (uae_s32)(uae_s16) next_iword_mmu030_state ();
pcadd += 1;
}
if ((dp & 0x30) == 0x30) {
base += next_ilong_mmu030_state ();
pcadd += 2;
}
if ((dp & 0x3) == 0x2) {
outer = (uae_s32)(uae_s16) next_iword_mmu030_state ();
pcadd += 1;
}
if ((dp & 0x3) == 0x3) {
outer = next_ilong_mmu030_state ();
pcadd += 2;
}
if ((dp & 0x4) == 0) {
base += regd;
}
if (dp & 0x3) {
base = get_long_mmu030_state (base);
}
if (dp & 0x4) {
base += regd;
}
v = base + outer;
} else {
v = base + (uae_s32)((uae_s8)dp) + regd;
}
mmu030_state[1] |= 1 << idx;
mmu030_state[2] |= pcadd << (idx * 4);
mmu030_disp_store[idx] = v;
mmu030_idx = oldidx;
mmu030_ad[mmu030_idx].done = false;
return v;
}
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