Commit 43057ab1 authored by bellard's avatar bellard
Browse files

use constants for TLB handling (Thiemo Seufer)


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1978 c046a42c-6fe2-441c-8c8c-71466251a162
parent c5d6edc3
......@@ -87,7 +87,7 @@ struct CPUMIPSState {
#endif
#if defined(MIPS_USES_R4K_TLB)
tlb_t tlb[16];
tlb_t tlb[MIPS_TLB_NB];
#endif
uint32_t CP0_index;
uint32_t CP0_random;
......
......@@ -28,53 +28,56 @@
#include "cpu.h"
#include "exec-all.h"
enum {
TLBRET_DIRTY = -4,
TLBRET_INVALID = -3,
TLBRET_NOMATCH = -2,
TLBRET_BADADDR = -1,
TLBRET_MATCH = 0
};
/* MIPS32 4K MMU emulation */
#ifdef MIPS_USES_R4K_TLB
static int map_address (CPUState *env, target_ulong *physical, int *prot,
target_ulong address, int rw, int access_type)
{
target_ulong tag = address & (TARGET_PAGE_MASK << 1);
uint8_t ASID = env->CP0_EntryHi & 0xFF;
tlb_t *tlb;
target_ulong tag;
uint8_t ASID;
int i, n;
int ret;
ret = -2;
tag = address & 0xFFFFE000;
ASID = env->CP0_EntryHi & 0xFF;
for (i = 0; i < MIPS_TLB_NB; i++) {
tlb = &env->tlb[i];
/* Check ASID, virtual page number & size */
if ((tlb->G == 1 || tlb->ASID == ASID) &&
tlb->VPN == tag && address < tlb->end2) {
/* TLB match */
n = (address >> 12) & 1;
n = (address >> TARGET_PAGE_BITS) & 1;
/* Check access rights */
if (!(n ? tlb->V1 : tlb->V0))
return -3;
if (rw == 0 || (n ? tlb->D1 : tlb->D0)) {
*physical = tlb->PFN[n] | (address & 0xFFF);
if (!(n ? tlb->V1 : tlb->V0))
return TLBRET_INVALID;
if (rw == 0 || (n ? tlb->D1 : tlb->D0)) {
*physical = tlb->PFN[n] | (address & ~TARGET_PAGE_MASK);
*prot = PAGE_READ;
if (n ? tlb->D1 : tlb->D0)
*prot |= PAGE_WRITE;
return 0;
return TLBRET_MATCH;
}
return -4;
return TLBRET_DIRTY;
}
}
return ret;
return TLBRET_NOMATCH;
}
#endif
int get_physical_address (CPUState *env, target_ulong *physical, int *prot,
target_ulong address, int rw, int access_type)
static int get_physical_address (CPUState *env, target_ulong *physical,
int *prot, target_ulong address,
int rw, int access_type)
{
int user_mode;
int ret;
/* User mode can only access useg */
user_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_UM;
int user_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_UM;
int ret = TLBRET_MATCH;
#if 0
if (logfile) {
fprintf(logfile, "user mode %d h %08x\n",
......@@ -82,8 +85,7 @@ int get_physical_address (CPUState *env, target_ulong *physical, int *prot,
}
#endif
if (user_mode && address > 0x7FFFFFFFUL)
return -1;
ret = 0;
return TLBRET_BADADDR;
if (address < 0x80000000UL) {
if (!(env->hflags & MIPS_HFLAG_ERL)) {
#ifdef MIPS_USES_R4K_TLB
......@@ -181,7 +183,7 @@ int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
access_type = ACCESS_INT;
if (env->user_mode_only) {
/* user mode only emulation */
ret = -2;
ret = TLBRET_NOMATCH;
goto do_fault;
}
ret = get_physical_address(env, &physical, &prot,
......@@ -190,14 +192,15 @@ int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
fprintf(logfile, "%s address=%08x ret %d physical %08x prot %d\n",
__func__, address, ret, physical, prot);
}
if (ret == 0) {
ret = tlb_set_page(env, address & ~0xFFF, physical & ~0xFFF, prot,
is_user, is_softmmu);
if (ret == TLBRET_MATCH) {
ret = tlb_set_page(env, address & TARGET_PAGE_MASK,
physical & TARGET_PAGE_MASK, prot,
is_user, is_softmmu);
} else if (ret < 0) {
do_fault:
switch (ret) {
default:
case -1:
case TLBRET_BADADDR:
/* Reference to kernel address from user mode or supervisor mode */
/* Reference to supervisor address from user mode */
if (rw)
......@@ -205,7 +208,7 @@ int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
else
exception = EXCP_AdEL;
break;
case -2:
case TLBRET_NOMATCH:
/* No TLB match for a mapped address */
if (rw)
exception = EXCP_TLBS;
......@@ -213,14 +216,14 @@ int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
exception = EXCP_TLBL;
error_code = 1;
break;
case -3:
case TLBRET_INVALID:
/* TLB match with no valid bit */
if (rw)
exception = EXCP_TLBS;
else
exception = EXCP_TLBL;
break;
case -4:
case TLBRET_DIRTY:
/* TLB match but 'D' bit is cleared */
exception = EXCP_LTLBL;
break;
......@@ -231,7 +234,7 @@ int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
env->CP0_Context = (env->CP0_Context & 0xff800000) |
((address >> 9) & 0x007ffff0);
env->CP0_EntryHi =
(env->CP0_EntryHi & 0xFF) | (address & 0xFFFFE000);
(env->CP0_EntryHi & 0xFF) | (address & (TARGET_PAGE_MASK << 1));
env->exception_index = exception;
env->error_code = error_code;
ret = 1;
......
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