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cpummu.cpp
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cpummu.cpp
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/*
* cpummu.cpp - MMU emulation
*
* Copyright (c) 2001-2004 Milan Jurik of ARAnyM dev team (see AUTHORS)
*
* Inspired by UAE MMU patch
*
* This file is part of the ARAnyM project which builds a new and powerful
* TOS/FreeMiNT compatible virtual machine running on almost any hardware.
*
* ARAnyM is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* ARAnyM is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ARAnyM; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "sysconfig.h"
#include "sysdeps.h"
#include "options.h"
#include "memory.h"
#include "newcpu.h"
#include "cpummu.h"
#include "debug.h"
#define MMUDUMP 1
#define DBG_MMU_VERBOSE 1
#define DBG_MMU_SANITY 1
#if 0
#define write_log printf
#endif
#ifdef FULLMMU
uae_u32 mmu_is_super;
uae_u32 mmu_tagmask, mmu_pagemask, mmu_pagemaski;
struct mmu_atc_line mmu_atc_array[ATC_TYPE][ATC_SLOTS][ATC_WAYS];
bool mmu_pagesize_8k;
int mmu_pageshift, mmu_pageshift1m;
uae_u8 mmu_cache_state;
uae_u8 cache_default_ins, cache_default_data;
int mmu060_state;
uae_u16 mmu_opcode;
bool mmu_restart;
static bool locked_rmw_cycle;
bool rmw_cycle;
static bool ismoves;
bool mmu_ttr_enabled, mmu_ttr_enabled_ins, mmu_ttr_enabled_data;
int mmu_atc_ways[2];
int way_random;
int mmu040_movem;
uaecptr mmu040_movem_ea;
uae_u32 mmu040_move16[4];
#if MMU_ICACHE
struct mmu_icache mmu_icache_data[MMU_ICACHE_SZ];
#endif
#if MMU_IPAGECACHE
uae_u32 atc_last_ins_laddr, atc_last_ins_paddr;
uae_u8 atc_last_ins_cache;
#endif
#if MMU_DPAGECACHE
struct mmufastcache atc_data_cache_read[MMUFASTCACHE_ENTRIES];
struct mmufastcache atc_data_cache_write[MMUFASTCACHE_ENTRIES];
#endif
#if CACHE_HIT_COUNT
int mmu_ins_hit, mmu_ins_miss;
int mmu_data_read_hit, mmu_data_read_miss;
int mmu_data_write_hit, mmu_data_write_miss;
#endif
static void mmu_dump_ttr(const TCHAR * label, uae_u32 ttr)
{
DUNUSED(label);
#if MMUDEBUG > 0
uae_u32 from_addr, to_addr;
from_addr = ttr & MMU_TTR_LOGICAL_BASE;
to_addr = (ttr & MMU_TTR_LOGICAL_MASK) << 8;
console_out_f(_T("%s: [%08x] %08x - %08x enabled=%d supervisor=%d wp=%d cm=%02d\n"),
label, ttr,
from_addr, to_addr,
ttr & MMU_TTR_BIT_ENABLED ? 1 : 0,
(ttr & (MMU_TTR_BIT_SFIELD_ENABLED | MMU_TTR_BIT_SFIELD_SUPER)) >> MMU_TTR_SFIELD_SHIFT,
ttr & MMU_TTR_BIT_WRITE_PROTECT ? 1 : 0,
(ttr & MMU_TTR_CACHE_MASK) >> MMU_TTR_CACHE_SHIFT
);
#endif
}
void mmu_make_transparent_region(uaecptr baseaddr, uae_u32 size, int datamode)
{
uae_u32 * ttr;
uae_u32 * ttr0 = datamode ? ®s.dtt0 : ®s.itt0;
uae_u32 * ttr1 = datamode ? ®s.dtt1 : ®s.itt1;
if ((*ttr1 & MMU_TTR_BIT_ENABLED) == 0)
ttr = ttr1;
else if ((*ttr0 & MMU_TTR_BIT_ENABLED) == 0)
ttr = ttr0;
else
return;
*ttr = baseaddr & MMU_TTR_LOGICAL_BASE;
*ttr |= ((baseaddr + size - 1) & MMU_TTR_LOGICAL_BASE) >> 8;
*ttr |= MMU_TTR_BIT_ENABLED;
#if MMUDEBUG > 0
write_log(_T("MMU: map transparent mapping of %08x\n"), *ttr);
#endif
}
void mmu_tt_modified (void)
{
mmu_ttr_enabled_ins = ((regs.itt0 | regs.itt1) & MMU_TTR_BIT_ENABLED) != 0;
mmu_ttr_enabled_data = ((regs.dtt0 | regs.dtt1) & MMU_TTR_BIT_ENABLED) != 0;
mmu_ttr_enabled = mmu_ttr_enabled_ins || mmu_ttr_enabled_data;
}
#if MMUDUMP
/* This dump output makes much more sense than old one */
#define LEVELA_SIZE 7
#define LEVELB_SIZE 7
#define LEVELC_SIZE (mmu_pagesize_8k ? 5 : 6)
#define PAGE_SIZE_4k 12 // = 1 << 12 = 4096
#define PAGE_SIZE_8k 13 // = 1 << 13 = 8192
#define LEVELA_VAL(x) ((((uae_u32)(x)) >> (32 - (LEVELA_SIZE ))) & ((1 << LEVELA_SIZE) - 1))
#define LEVELB_VAL(x) ((((uae_u32)(x)) >> (32 - (LEVELA_SIZE + LEVELB_SIZE ))) & ((1 << LEVELB_SIZE) - 1))
#define LEVELC_VAL(x) ((((uae_u32)(x)) >> (32 - (LEVELA_SIZE + LEVELB_SIZE + LEVELC_SIZE))) & ((1 << LEVELC_SIZE) - 1))
#define LEVELA(root, x) (get_long(root + LEVELA_VAL(x) * 4))
#define LEVELB(a, x) (get_long((((uae_u32)a) & ~((1 << (LEVELB_SIZE + 2)) - 1)) + LEVELB_VAL(x) * 4))
#define LEVELC(b, x) (get_long((((uae_u32)b) & ~((1 << (LEVELC_SIZE + 2)) - 1)) + LEVELC_VAL(x) * 4))
#define ISINVALID(x) ((((ULONG)x) & 3) == 0)
static uae_u32 getdesc(uae_u32 root, uae_u32 addr)
{
ULONG desc;
desc = LEVELA(root, addr);
if (ISINVALID(desc))
return desc;
desc = LEVELB(desc, addr);
if (ISINVALID(desc))
return desc;
desc = LEVELC(desc, addr);
return desc;
}
static void mmu_dump_table(const char * label, uaecptr root_ptr)
{
ULONG i;
ULONG startaddr;
ULONG odesc;
ULONG totalpages;
ULONG page_size = mmu_pagesize_8k ? PAGE_SIZE_8k : PAGE_SIZE_4k;
ULONG pagemask = (1 << page_size) - 1;
ULONG descmask = pagemask & ~(0x08 | 0x10); // mask out unused and M bits
root_ptr &= 0xfffffe00;
console_out_f(_T("MMU dump start. Root = %08x. Page = %d\n"), root_ptr, 1 << page_size);
totalpages = 1 << (32 - page_size);
startaddr = 0;
odesc = getdesc(root_ptr, startaddr);
for (i = 0; i <= totalpages; i++) {
ULONG addr = i << page_size;
ULONG desc = 0;
if (i < totalpages)
desc = getdesc(root_ptr, addr);
if ((desc & descmask) != (odesc & descmask) || i == totalpages) {
uae_u8 cm, sp;
cm = (odesc >> 5) & 3;
sp = (odesc >> 7) & 1;
console_out_f(_T("%08x - %08x: %08x WP=%d S=%d CM=%d V=%d (%08x)\n"),
startaddr, addr - 1, odesc & ~((1 << page_size) - 1),
(odesc & 4) ? 1 : 0, sp, cm, (odesc & 3) > 0, odesc);
startaddr = addr;
odesc = desc;
}
}
console_out_f(_T("MMU dump end\n"));
}
#else
/* {{{ mmu_dump_table */
static void mmu_dump_table(const char * label, uaecptr root_ptr)
{
DUNUSED(label);
const int ROOT_TABLE_SIZE = 128,
PTR_TABLE_SIZE = 128,
PAGE_TABLE_SIZE = 64,
ROOT_INDEX_SHIFT = 25,
PTR_INDEX_SHIFT = 18;
// const int PAGE_INDEX_SHIFT = 12;
int root_idx, ptr_idx, page_idx;
uae_u32 root_des, ptr_des, page_des;
uaecptr ptr_des_addr, page_addr,
root_log, ptr_log, page_log;
console_out_f(_T("%s: root=%x\n"), label, root_ptr);
for (root_idx = 0; root_idx < ROOT_TABLE_SIZE; root_idx++) {
root_des = phys_get_long(root_ptr + root_idx);
if ((root_des & 2) == 0)
continue; /* invalid */
console_out_f(_T("ROOT: %03d U=%d W=%d UDT=%02d\n"), root_idx,
root_des & 8 ? 1 : 0,
root_des & 4 ? 1 : 0,
root_des & 3
);
root_log = root_idx << ROOT_INDEX_SHIFT;
ptr_des_addr = root_des & MMU_ROOT_PTR_ADDR_MASK;
for (ptr_idx = 0; ptr_idx < PTR_TABLE_SIZE; ptr_idx++) {
struct {
uaecptr log, phys;
int start_idx, n_pages; /* number of pages covered by this entry */
uae_u32 match;
} page_info[PAGE_TABLE_SIZE];
int n_pages_used;
ptr_des = phys_get_long(ptr_des_addr + ptr_idx);
ptr_log = root_log | (ptr_idx << PTR_INDEX_SHIFT);
if ((ptr_des & 2) == 0)
continue; /* invalid */
page_addr = ptr_des & (mmu_pagesize_8k ? MMU_PTR_PAGE_ADDR_MASK_8 : MMU_PTR_PAGE_ADDR_MASK_4);
n_pages_used = -1;
for (page_idx = 0; page_idx < PAGE_TABLE_SIZE; page_idx++) {
page_des = phys_get_long(page_addr + page_idx);
page_log = ptr_log | (page_idx << 2); // ??? PAGE_INDEX_SHIFT
switch (page_des & 3) {
case 0: /* invalid */
continue;
case 1: case 3: /* resident */
case 2: /* indirect */
if (n_pages_used == -1 || page_info[n_pages_used].match != page_des) {
/* use the next entry */
n_pages_used++;
page_info[n_pages_used].match = page_des;
page_info[n_pages_used].n_pages = 1;
page_info[n_pages_used].start_idx = page_idx;
page_info[n_pages_used].log = page_log;
} else {
page_info[n_pages_used].n_pages++;
}
break;
}
}
if (n_pages_used == -1)
continue;
console_out_f(_T(" PTR: %03d U=%d W=%d UDT=%02d\n"), ptr_idx,
ptr_des & 8 ? 1 : 0,
ptr_des & 4 ? 1 : 0,
ptr_des & 3
);
for (page_idx = 0; page_idx <= n_pages_used; page_idx++) {
page_des = page_info[page_idx].match;
if ((page_des & MMU_PDT_MASK) == 2) {
console_out_f(_T(" PAGE: %03d-%03d log=%08x INDIRECT --> addr=%08x\n"),
page_info[page_idx].start_idx,
page_info[page_idx].start_idx + page_info[page_idx].n_pages - 1,
page_info[page_idx].log,
page_des & MMU_PAGE_INDIRECT_MASK
);
} else {
console_out_f(_T(" PAGE: %03d-%03d log=%08x addr=%08x UR=%02d G=%d U1/0=%d S=%d CM=%d M=%d U=%d W=%d\n"),
page_info[page_idx].start_idx,
page_info[page_idx].start_idx + page_info[page_idx].n_pages - 1,
page_info[page_idx].log,
page_des & (mmu_pagesize_8k ? MMU_PAGE_ADDR_MASK_8 : MMU_PAGE_ADDR_MASK_4),
(page_des & (mmu_pagesize_8k ? MMU_PAGE_UR_MASK_8 : MMU_PAGE_UR_MASK_4)) >> MMU_PAGE_UR_SHIFT,
page_des & MMU_DES_GLOBAL ? 1 : 0,
(page_des & MMU_TTR_UX_MASK) >> MMU_TTR_UX_SHIFT,
page_des & MMU_DES_SUPER ? 1 : 0,
(page_des & MMU_TTR_CACHE_MASK) >> MMU_TTR_CACHE_SHIFT,
page_des & MMU_DES_MODIFIED ? 1 : 0,
page_des & MMU_DES_USED ? 1 : 0,
page_des & MMU_DES_WP ? 1 : 0
);
}
}
}
}
}
/* }}} */
#endif
/* {{{ mmu_dump_atc */
static void mmu_dump_atc(void)
{
}
/* }}} */
/* {{{ mmu_dump_tables */
void mmu_dump_tables(void)
{
console_out_f(_T("URP: %08x SRP: %08x MMUSR: %x TC: %x\n"), regs.urp, regs.srp, regs.mmusr, regs.tcr);
mmu_dump_ttr(_T("DTT0"), regs.dtt0);
mmu_dump_ttr(_T("DTT1"), regs.dtt1);
mmu_dump_ttr(_T("ITT0"), regs.itt0);
mmu_dump_ttr(_T("ITT1"), regs.itt1);
mmu_dump_atc();
#if MMUDUMP
mmu_dump_table("SRP", regs.srp);
if (regs.urp != regs.srp)
mmu_dump_table("URP", regs.urp);
#endif
}
/* }}} */
static void flush_shortcut_cache(uaecptr addr, bool super)
{
#if MMU_IPAGECACHE
atc_last_ins_laddr = mmu_pagemask;
#endif
#if MMU_DPAGECACHE
if (addr == 0xffffffff) {
memset(&atc_data_cache_read, 0xff, sizeof atc_data_cache_read);
memset(&atc_data_cache_write, 0xff, sizeof atc_data_cache_write);
} else {
for (int i = 0; i < MMUFASTCACHE_ENTRIES; i++) {
uae_u32 idx = ((addr & mmu_pagemaski) >> mmu_pageshift1m) | (super ? 1 : 0);
if (atc_data_cache_read[i].log == idx)
atc_data_cache_read[i].log = 0xffffffff;
if (atc_data_cache_write[i].log == idx)
atc_data_cache_write[i].log = 0xffffffff;
}
}
#endif
}
static ALWAYS_INLINE int mmu_get_fc(bool super, bool data)
{
return (super ? 4 : 0) | (data ? 1 : 2);
}
void mmu_hardware_bus_error(uaecptr addr, uae_u32 v, bool read, bool ins, int size)
{
uae_u32 fc;
if (ismoves) {
fc = read ? regs.sfc : regs.dfc;
} else {
fc = (regs.s ? 4 : 0) | (ins ? 2 : 1);
}
mmu_bus_error(addr, v, fc, !read, size, 0, true);
}
bool mmu_is_super_access(bool read)
{
if (!ismoves) {
return regs.s;
} else {
uae_u32 fc = read ? regs.sfc : regs.dfc;
return (fc & 4) != 0;
}
}
void mmu_bus_error(uaecptr addr, uae_u32 val, int fc, bool write, int size,uae_u32 status060, bool nonmmu)
{
if (currprefs.mmu_model == 68040) {
uae_u16 ssw = 0;
if (ismoves) {
// MOVES special behavior
int old_fc = fc = write ? regs.dfc : regs.sfc;
if ((fc & 3) == 0 || (fc & 3) == 3) {
ssw |= MMU_SSW_TT1;
} else if (fc & 2) {
fc = (fc & 4) | 1;
}
#if MMUDEBUGMISC > 0
write_log (_T("040 MMU MOVES fc=%d -> %d\n"), old_fc, fc);
#endif
}
ssw |= fc & MMU_SSW_TM; /* TM = FC */
switch (size) {
case sz_byte:
ssw |= MMU_SSW_SIZE_B;
break;
case sz_word:
ssw |= MMU_SSW_SIZE_W;
break;
case sz_long:
ssw |= MMU_SSW_SIZE_L;
break;
}
regs.wb3_status = write ? 0x80 | (ssw & 0x7f) : 0;
regs.wb3_data = val;
regs.wb2_status = 0;
if (!write)
ssw |= MMU_SSW_RW;
if (size == 16) { // MOVE16
ssw |= MMU_SSW_SIZE_CL;
ssw |= MMU_SSW_TT0;
regs.mmu_effective_addr &= ~15;
if (write) {
// clear normal writeback if MOVE16 write
regs.wb3_status &= ~0x80;
// wb2 = cacheline size writeback
regs.wb2_status = 0x80 | MMU_SSW_SIZE_CL | (ssw & 0x1f);
regs.wb2_address = regs.mmu_effective_addr;
write_log (_T("040 MMU MOVE16 WRITE FAULT!\n"));
}
}
if (mmu040_movem) {
ssw |= MMU_SSW_CM;
regs.mmu_effective_addr = mmu040_movem_ea;
mmu040_movem = 0;
#if MMUDEBUGMISC > 0
write_log (_T("040 MMU_SSW_CM EA=%08X\n"), mmu040_movem_ea);
#endif
}
if (locked_rmw_cycle) {
ssw |= MMU_SSW_LK;
ssw &= ~MMU_SSW_RW;
#if MMUDEBUGMISC > 0
write_log (_T("040 MMU_SSW_LK!\n"));
#endif
}
if (!nonmmu)
ssw |= MMU_SSW_ATC;
regs.mmu_ssw = ssw;
#if MMUDEBUG > 0
write_log(_T("BF: fc=%d w=%d logical=%08x ssw=%04x PC=%08x INS=%04X\n"), fc, write, addr, ssw, m68k_getpc(), mmu_opcode);
#endif
} else {
uae_u32 fslw = 0;
fslw |= write ? MMU_FSLW_W : MMU_FSLW_R;
fslw |= fc << 16; /* MMU_FSLW_TM */
switch (size) {
case sz_byte:
fslw |= MMU_FSLW_SIZE_B;
break;
case sz_word:
fslw |= MMU_FSLW_SIZE_W;
break;
case sz_long:
fslw |= MMU_FSLW_SIZE_L;
break;
case 16: // MOVE16
addr &= ~15;
fslw |= MMU_FSLW_SIZE_D;
fslw |= MMU_FSLW_TT_16;
break;
}
if ((fc & 3) == 2) {
// instruction faults always point to opcode address
#if MMUDEBUGMISC > 0
write_log(_T("INS FAULT %08x %08x %d\n"), addr, regs.instruction_pc, mmu060_state);
#endif
addr = regs.instruction_pc;
if (mmu060_state == 0) {
fslw |= MMU_FSLW_IO; // opword fetch
} else {
fslw |= MMU_FSLW_IO | MMU_FSLW_MA; // extension word
}
}
if (rmw_cycle) {
fslw |= MMU_FSLW_W | MMU_FSLW_R;
}
if (locked_rmw_cycle) {
fslw |= MMU_FSLW_LK;
write_log (_T("060 MMU_FSLW_LK!\n"));
}
fslw |= status060;
regs.mmu_fslw = fslw;
#if MMUDEBUG > 0
write_log(_T("BF: fc=%d w=%d s=%d log=%08x ssw=%08x rmw=%d PC=%08x INS=%04X\n"), fc, write, 1 << size, addr, fslw, rmw_cycle, m68k_getpc(), mmu_opcode);
#endif
}
ismoves = false;
rmw_cycle = false;
locked_rmw_cycle = false;
regs.mmu_fault_addr = addr;
#if 0
activate_debugger ();
#endif
cache_default_data &= ~CACHE_DISABLE_ALLOCATE;
THROW(2);
}
/*
* mmu access is a 4 step process:
* if mmu is not enabled just read physical
* check transparent region, if transparent, read physical
* check ATC (address translation cache), read immediately if HIT
* read from mmu with the long path (and allocate ATC entry if needed)
*/
/* check if an address matches a ttr */
static int mmu_do_match_ttr(uae_u32 ttr, uaecptr addr, bool super)
{
if (ttr & MMU_TTR_BIT_ENABLED) { /* TTR enabled */
uae_u8 msb, mask;
msb = ((addr ^ ttr) & MMU_TTR_LOGICAL_BASE) >> 24;
mask = (ttr & MMU_TTR_LOGICAL_MASK) >> 16;
if (!(msb & ~mask)) {
if ((ttr & MMU_TTR_BIT_SFIELD_ENABLED) == 0) {
if (((ttr & MMU_TTR_BIT_SFIELD_SUPER) == 0) != (super == 0)) {
return TTR_NO_MATCH;
}
}
if (ttr & MMU_TTR_CACHE_DISABLE) {
mmu_cache_state = CACHE_DISABLE_MMU;
} else {
mmu_cache_state = CACHE_ENABLE_ALL;
if (ttr & MMU_TTR_CACHE_MODE) {
mmu_cache_state |= CACHE_ENABLE_COPYBACK;
}
}
return (ttr & MMU_TTR_BIT_WRITE_PROTECT) ? TTR_NO_WRITE : TTR_OK_MATCH;
}
}
return TTR_NO_MATCH;
}
int mmu_match_ttr_ins(uaecptr addr, bool super)
{
int res;
if (!mmu_ttr_enabled_ins)
return TTR_NO_MATCH;
res = mmu_do_match_ttr(regs.itt0, addr, super);
if (res == TTR_NO_MATCH)
res = mmu_do_match_ttr(regs.itt1, addr, super);
return res;
}
int mmu_match_ttr(uaecptr addr, bool super, bool data)
{
int res;
if (!mmu_ttr_enabled)
return TTR_NO_MATCH;
if (data) {
res = mmu_do_match_ttr(regs.dtt0, addr, super);
if (res == TTR_NO_MATCH)
res = mmu_do_match_ttr(regs.dtt1, addr, super);
} else {
res = mmu_do_match_ttr(regs.itt0, addr, super);
if (res == TTR_NO_MATCH)
res = mmu_do_match_ttr(regs.itt1, addr, super);
}
return res;
}
void mmu_bus_error_ttr_write_fault(uaecptr addr, bool super, bool data, uae_u32 val, int size)
{
uae_u32 status = 0;
if (currprefs.mmu_model == 68060) {
status |= MMU_FSLW_TTR;
}
mmu_bus_error(addr, val, mmu_get_fc (super, data), true, size, status, false);
}
int mmu_match_ttr_write(uaecptr addr, bool super, bool data, uae_u32 val, int size)
{
int res = TTR_NO_MATCH;
if (mmu_ttr_enabled) {
res = mmu_match_ttr(addr, super, data);
}
if (res == TTR_NO_WRITE || (res == TTR_NO_MATCH && !regs.mmu_enabled && (regs.tcr & MMU_TCR_DWO)))
mmu_bus_error_ttr_write_fault(addr, super, data, val, size);
return res;
}
int mmu_match_ttr_maybe_write(uaecptr addr, bool super, bool data, int size, bool write)
{
int res = TTR_NO_MATCH;
if (mmu_ttr_enabled) {
res = mmu_match_ttr(addr, super, data);
}
if (write && ((res == TTR_NO_WRITE) || (res == TTR_NO_MATCH && !regs.mmu_enabled && (regs.tcr & MMU_TCR_DWO))))
mmu_bus_error_ttr_write_fault(addr, super, data, 0, size);
return res;
}
// Descriptor read accesses can use data cache but never allocate new cache lines.
static uae_u32 desc_get_long(uaecptr addr)
{
mmu_cache_state = ce_cachable[addr >>16] | CACHE_DISABLE_ALLOCATE;
return x_phys_get_long(addr);
}
// Write accesses probably are always pushed to memomory
static void desc_put_long(uaecptr addr, uae_u32 v)
{
mmu_cache_state = CACHE_DISABLE_MMU;
x_phys_put_long(addr, v);
}
/*
* Lookup the address by walking the page table and updating
* the page descriptors accordingly. Returns the found descriptor
* or produces a bus error.
*/
static uae_u32 mmu_fill_atc(uaecptr addr, bool super, uae_u32 tag, bool write, struct mmu_atc_line *l, uae_u32 *status060)
{
uae_u32 desc, desc_addr, wp;
uae_u32 status = 0;
int i;
int old_s;
// Use supervisor mode to access descriptors (really is fc = 7)
old_s = regs.s;
regs.s = 1;
wp = 0;
desc = super ? regs.srp : regs.urp;
/* fetch root table descriptor */
i = (addr >> 23) & 0x1fc;
desc_addr = (desc & MMU_ROOT_PTR_ADDR_MASK) | i;
SAVE_EXCEPTION;
TRY(prb) {
desc = desc_get_long(desc_addr);
if ((desc & 2) == 0) {
#if MMUDEBUG > 1
write_log(_T("MMU: invalid root descriptor %s for %x desc at %x desc=%x\n"), super ? _T("srp"):_T("urp"),
addr, desc_addr, desc);
#endif
*status060 |= MMU_FSLW_PTA;
goto fail;
}
wp |= desc;
if ((desc & MMU_DES_USED) == 0) {
desc_put_long(desc_addr, desc | MMU_DES_USED);
}
/* fetch pointer table descriptor */
i = (addr >> 16) & 0x1fc;
desc_addr = (desc & MMU_ROOT_PTR_ADDR_MASK) | i;
desc = desc_get_long(desc_addr);
if ((desc & 2) == 0) {
#if MMUDEBUG > 1
write_log(_T("MMU: invalid ptr descriptor %s for %x desc at %x desc=%x\n"), super ? _T("srp"):_T("urp"),
addr, desc_addr, desc);
#endif
*status060 |= MMU_FSLW_PTB;
goto fail;
}
wp |= desc;
if ((desc & MMU_DES_USED) == 0)
desc_put_long(desc_addr, desc | MMU_DES_USED);
/* fetch page table descriptor */
if (mmu_pagesize_8k) {
i = (addr >> 11) & 0x7c;
desc_addr = (desc & MMU_PTR_PAGE_ADDR_MASK_8) + i;
} else {
i = (addr >> 10) & 0xfc;
desc_addr = (desc & MMU_PTR_PAGE_ADDR_MASK_4) + i;
}
desc = desc_get_long(desc_addr);
if ((desc & 3) == 2) {
/* indirect */
desc_addr = desc & MMU_PAGE_INDIRECT_MASK;
desc = desc_get_long(desc_addr);
}
if ((desc & 1) == 1) {
wp |= desc;
if (write) {
if ((wp & MMU_DES_WP) || ((desc & MMU_DES_SUPER) && !super)) {
if ((desc & MMU_DES_USED) == 0) {
desc |= MMU_DES_USED;
desc_put_long(desc_addr, desc);
}
} else if ((desc & (MMU_DES_USED|MMU_DES_MODIFIED)) !=
(MMU_DES_USED|MMU_DES_MODIFIED)) {
desc |= MMU_DES_USED|MMU_DES_MODIFIED;
desc_put_long(desc_addr, desc);
}
} else {
if ((desc & MMU_DES_USED) == 0) {
desc |= MMU_DES_USED;
desc_put_long(desc_addr, desc);
}
}
desc |= wp & MMU_DES_WP;
} else {
if ((desc & 3) == 2) {
*status060 |= MMU_FSLW_IL;
#if MMUDEBUG > 1
write_log(_T("MMU: double indirect descriptor log=%0x desc=%08x @%08x\n"), addr, desc, desc_addr);
#endif
} else {
*status060 |= MMU_FSLW_PF;
#if MMUDEBUG > 2
write_log(_T("MMU: invalid page descriptor log=%0x desc=%08x @%08x\n"), addr, desc, desc_addr);
#endif
}
fail:
desc = 0;
}
/* this will cause a bus error exception */
if (!super && (desc & MMU_DES_SUPER)) {
*status060 |= MMU_FSLW_SP;
} else if (write && (desc & MMU_DES_WP)) {
*status060 |= MMU_FSLW_WP;
}
// 68040 always creates ATC entry. 68060 only if valid descriptor was found.
if (currprefs.mmu_model == 68040 || (desc & MMU_MMUSR_R)) {
/* Create new ATC entry and return status */
l->status = desc & (MMU_MMUSR_G|MMU_MMUSR_Ux|MMU_MMUSR_S|MMU_MMUSR_CM|MMU_MMUSR_M|MMU_MMUSR_W|MMU_MMUSR_R);
l->phys = desc & mmu_pagemaski;
l->valid = 1;
l->tag = tag;
status = l->phys | l->status;
}
RESTORE_EXCEPTION;
} CATCH(prb) {
RESTORE_EXCEPTION;
/* bus error during table search */
if (currprefs.mmu_model == 68040) {
l->status = 0;
l->phys = 0;
l->valid = 1;
l->tag = tag;
}
status = MMU_MMUSR_B;
*status060 |= MMU_FSLW_LK | MMU_FSLW_TWE;
#if MMUDEBUG > 0
write_log(_T("MMU: bus error during table search.\n"));
#endif
} ENDTRY;
// Restore original supervisor state
regs.s = old_s;
#if MMUDEBUG > 2
write_log(_T("translate: %x,%u,%u -> %x\n"), addr, super, write, desc);
#endif
flush_shortcut_cache(addr, super);
return status;
}
static void mmu_add_cache(uaecptr addr, uaecptr phys, bool super, bool data, bool write)
{
if (!data) {
#if MMU_IPAGECACHE
uae_u32 laddr = (addr & mmu_pagemaski) | (super ? 1 : 0);
atc_last_ins_laddr = laddr;
atc_last_ins_paddr = phys;
atc_last_ins_cache = mmu_cache_state;
#else
;
#endif
#if MMU_DPAGECACHE
} else {
uae_u32 idx1 = ((addr & mmu_pagemaski) >> mmu_pageshift1m) | (super ? 1 : 0);
uae_u32 idx2 = idx1 & (MMUFASTCACHE_ENTRIES - 1);
if (write) {
if (idx2 < MMUFASTCACHE_ENTRIES - 1) {
atc_data_cache_write[idx2].log = idx1;
atc_data_cache_write[idx2].phys = phys;
atc_data_cache_write[idx2].cache_state = mmu_cache_state;
}
} else {
if (idx2 < MMUFASTCACHE_ENTRIES - 1) {
atc_data_cache_read[idx2].log = idx1;
atc_data_cache_read[idx2].phys = phys;
atc_data_cache_read[idx2].cache_state = mmu_cache_state;
}
}
#endif
}
}
uaecptr mmu_translate(uaecptr addr, uae_u32 val, bool super, bool data, bool write, int size)
{
int way, i, index, way_invalid;
struct mmu_atc_line *l;
uae_u32 status060 = 0;
uae_u32 tag = ((super ? 0x80000000 : 0x00000000) | (addr >> 1)) & mmu_tagmask;
if (mmu_pagesize_8k)
index=(addr & 0x0001E000)>>13;
else
index=(addr & 0x0000F000)>>12;
way_invalid = ATC_WAYS;
way_random++;
way = mmu_atc_ways[data];
for (i = 0; i < ATC_WAYS; i++) {
// if we have this
l = &mmu_atc_array[data][index][way];
if (l->valid) {
if (tag == l->tag) {
atc_retry:
// check if we need to cause a page fault
if (((l->status&(MMU_MMUSR_W|MMU_MMUSR_S|MMU_MMUSR_R))!=MMU_MMUSR_R)) {
if (((l->status&MMU_MMUSR_W) && write) ||
((l->status&MMU_MMUSR_S) && !super) ||
!(l->status&MMU_MMUSR_R)) {
if ((l->status&MMU_MMUSR_S) && !super)
status060 |= MMU_FSLW_SP;
if ((l->status&MMU_MMUSR_W) && write)
status060 |= MMU_FSLW_WP;
mmu_bus_error(addr, val, mmu_get_fc(super, data), write, size, status060, false);
return 0; // never reach, bus error longjumps out of the function
}
}
// if first write to this page initiate table search to set M bit (but modify this slot)
if (!(l->status&MMU_MMUSR_M) && write) {
way_invalid = way;
break;
}
// save way for next access (likely in same page)
mmu_atc_ways[data] = way;
if (l->status & MMU_MMUSR_CM_DISABLE) {
mmu_cache_state = CACHE_DISABLE_MMU;
} else {
mmu_cache_state = CACHE_ENABLE_ALL;
if (l->status & MMU_MMUSR_CM_MODE) {
mmu_cache_state |= CACHE_ENABLE_COPYBACK;
}
}
mmu_add_cache(addr, l->phys, super, data, write);
// return translated addr
return l->phys | (addr & mmu_pagemask);
} else {
way_invalid = way;
}
}
way++;
way %= ATC_WAYS;
}
// no entry found, we need to create a new one, first find an atc line to replace
way_random %= ATC_WAYS;
way = (way_invalid < ATC_WAYS) ? way_invalid : way_random;
// then initiate table search and create a new entry
l = &mmu_atc_array[data][index][way];
mmu_fill_atc(addr, super, tag, write, l, &status060);
if (status060 && currprefs.mmu_model == 68060) {
mmu_bus_error(addr, val, mmu_get_fc(super, data), write, size, status060, false);
}
// and retry the ATC search
way_random++;
goto atc_retry;
}
static void misalignednotfirst(uaecptr addr)
{
#if MMUDEBUGMISC > 0
write_log (_T("misalignednotfirst %08x -> %08x %08X\n"), regs.mmu_fault_addr, addr, regs.instruction_pc);
#endif
regs.mmu_fault_addr = addr;
regs.mmu_fslw |= MMU_FSLW_MA;
regs.mmu_ssw |= MMU_SSW_MA;
}
static void misalignednotfirstcheck(uaecptr addr)
{
if (regs.mmu_fault_addr == addr)
return;
misalignednotfirst (addr);
}
uae_u16 REGPARAM2 mmu_get_word_unaligned(uaecptr addr, bool data)
{
uae_u16 res;
res = (uae_u16)mmu_get_byte(addr, data, sz_word) << 8;
SAVE_EXCEPTION;
TRY(prb) {
res |= mmu_get_byte(addr + 1, data, sz_word);
RESTORE_EXCEPTION;
}
CATCH(prb) {
RESTORE_EXCEPTION;
misalignednotfirst(addr);
THROW_AGAIN(prb);
} ENDTRY
return res;
}
uae_u32 REGPARAM2 mmu_get_long_unaligned(uaecptr addr, bool data)
{
uae_u32 res;
if (likely(!(addr & 1))) {
res = (uae_u32)mmu_get_word(addr, data, sz_long) << 16;
SAVE_EXCEPTION;
TRY(prb) {
res |= mmu_get_word(addr + 2, data, sz_long);
RESTORE_EXCEPTION;
}
CATCH(prb) {
RESTORE_EXCEPTION;
misalignednotfirst(addr);
THROW_AGAIN(prb);
} ENDTRY
} else {
res = (uae_u32)mmu_get_byte(addr, data, sz_long) << 8;
SAVE_EXCEPTION;
TRY(prb) {
res = (res | mmu_get_byte(addr + 1, data, sz_long)) << 8;
res = (res | mmu_get_byte(addr + 2, data, sz_long)) << 8;
res |= mmu_get_byte(addr + 3, data, sz_long);
RESTORE_EXCEPTION;
}
CATCH(prb) {
RESTORE_EXCEPTION;
misalignednotfirst(addr);
THROW_AGAIN(prb);
} ENDTRY
}
return res;
}
uae_u32 REGPARAM2 mmu_get_ilong_unaligned(uaecptr addr)
{
uae_u32 res;
res = (uae_u32)mmu_get_iword(addr, sz_long) << 16;
SAVE_EXCEPTION;
TRY(prb) {
res |= mmu_get_iword(addr + 2, sz_long);
RESTORE_EXCEPTION;
}
CATCH(prb) {
RESTORE_EXCEPTION;
misalignednotfirst(addr);
THROW_AGAIN(prb);
} ENDTRY