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MIPS TLB style selection at runtime, by Herve Poussineau.

Browse Source 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2809 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
ths 2007-05-13 13:49:44 +00:00
parent f707cfba9a
commit 29929e3490
8 changed files with 149 additions and 114 deletions
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32
target-mips/cpu.h
View File

@ -33,9 +33,8 @@ union fpr_t {
# define FP_ENDIAN_IDX 0
#endif
#if defined(MIPS_USES_R4K_TLB)
typedef struct tlb_t tlb_t;
struct tlb_t {
typedef struct r4k_tlb_t r4k_tlb_t;
struct r4k_tlb_t {
target_ulong VPN;
uint32_t PageMask;
uint_fast8_t ASID;
@ -48,7 +47,6 @@ struct tlb_t {
uint_fast16_t D1:1;
target_ulong PFN[2];
};
#endif
typedef struct CPUMIPSState CPUMIPSState;
struct CPUMIPSState {
@ -100,11 +98,19 @@ struct CPUMIPSState {
#define FP_INVALID 16
#define FP_UNIMPLEMENTED 32
#if defined(MIPS_USES_R4K_TLB)
tlb_t tlb[MIPS_TLB_MAX];
uint32_t tlb_in_use;
uint32_t nb_tlb;
#endif
uint32_t tlb_in_use;
int (*map_address) (CPUMIPSState *env, target_ulong *physical, int *prot, target_ulong address, int rw, int access_type);
void (*do_tlbwi) (void);
void (*do_tlbwr) (void);
void (*do_tlbp) (void);
void (*do_tlbr) (void);
union {
struct {
r4k_tlb_t tlb[MIPS_TLB_MAX];
} r4k;
} mmu;
int32_t CP0_Index;
int32_t CP0_Random;
target_ulong CP0_EntryLo0;
@ -289,6 +295,16 @@ struct CPUMIPSState {
struct QEMUTimer *timer; /* Internal timer */
};
int no_mmu_map_address (CPUMIPSState *env, target_ulong *physical, int *prot,
target_ulong address, int rw, int access_type);
int fixed_mmu_map_address (CPUMIPSState *env, target_ulong *physical, int *prot,
target_ulong address, int rw, int access_type);
int r4k_map_address (CPUMIPSState *env, target_ulong *physical, int *prot,
target_ulong address, int rw, int access_type);
void r4k_do_tlbwi (void);
void r4k_do_tlbwr (void);
void r4k_do_tlbp (void);
void r4k_do_tlbr (void);
typedef struct mips_def_t mips_def_t;
int mips_find_by_name (const unsigned char *name, mips_def_t **def);
void mips_cpu_list (FILE *f, int (*cpu_fprintf)(FILE *f, const char *fmt, ...));

6
target-mips/exec.h
View File

@ -105,10 +105,6 @@ void do_mfc0_count(void);
void do_mtc0_entryhi(uint32_t in);
void do_mtc0_status_debug(uint32_t old, uint32_t val);
void do_mtc0_status_irqraise_debug(void);
void do_tlbwi (void);
void do_tlbwr (void);
void do_tlbp (void);
void do_tlbr (void);
void dump_fpu(CPUState *env);
void fpu_dump_state(CPUState *env, FILE *f,
int (*fpu_fprintf)(FILE *f, const char *fmt, ...),
@ -151,7 +147,7 @@ void dump_sc (void);
int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
int is_user, int is_softmmu);
void do_interrupt (CPUState *env);
void invalidate_tlb (CPUState *env, int idx, int use_extra);
void r4k_invalidate_tlb (CPUState *env, int idx, int use_extra);
void cpu_loop_exit(void);
void do_raise_exception_err (uint32_t exception, int error_code);

72
target-mips/helper.c
View File

@ -36,16 +36,42 @@ enum {
TLBRET_MATCH = 0
};
/* MIPS32 4K MMU emulation */
#ifdef MIPS_USES_R4K_TLB
static int map_address (CPUState *env, target_ulong *physical, int *prot,
/* no MMU emulation */
int no_mmu_map_address (CPUState *env, target_ulong *physical, int *prot,
target_ulong address, int rw, int access_type)
{
*physical = address;
*prot = PAGE_READ | PAGE_WRITE;
return TLBRET_MATCH;
}
/* fixed mapping MMU emulation */
int fixed_mmu_map_address (CPUState *env, target_ulong *physical, int *prot,
target_ulong address, int rw, int access_type)
{
if (address <= (int32_t)0x7FFFFFFFUL) {
if (!(env->CP0_Status & (1 << CP0St_ERL)))
*physical = address + 0x40000000UL;
else
*physical = address;
} else if (address <= (int32_t)0xBFFFFFFFUL)
*physical = address & 0x1FFFFFFF;
else
*physical = address;
*prot = PAGE_READ | PAGE_WRITE;
return TLBRET_MATCH;
}
/* MIPS32/MIPS64 R4000-style MMU emulation */
int r4k_map_address (CPUState *env, target_ulong *physical, int *prot,
target_ulong address, int rw, int access_type)
{
uint8_t ASID = env->CP0_EntryHi & 0xFF;
int i;
for (i = 0; i < env->tlb_in_use; i++) {
tlb_t *tlb = &env->tlb[i];
r4k_tlb_t *tlb = &env->mmu.r4k.tlb[i];
/* 1k pages are not supported. */
target_ulong mask = tlb->PageMask | 0x1FFF;
target_ulong tag = address & ~mask;
@ -71,7 +97,6 @@ static int map_address (CPUState *env, target_ulong *physical, int *prot,
}
return TLBRET_NOMATCH;
}
#endif
static int get_physical_address (CPUState *env, target_ulong *physical,
int *prot, target_ulong address,
@ -104,14 +129,9 @@ static int get_physical_address (CPUState *env, target_ulong *physical,
if (address <= (int32_t)0x7FFFFFFFUL) {
/* useg */
if (!(env->CP0_Status & (1 << CP0St_ERL) && user_mode)) {
#ifdef MIPS_USES_R4K_TLB
ret = map_address(env, physical, prot, address, rw, access_type);
#else
*physical = address + 0x40000000UL;
*prot = PAGE_READ | PAGE_WRITE;
#endif
ret = env->map_address(env, physical, prot, address, rw, access_type);
} else {
*physical = address;
*physical = address & 0xFFFFFFFF;
*prot = PAGE_READ | PAGE_WRITE;
}
#ifdef TARGET_MIPS64
@ -123,14 +143,14 @@ static int get_physical_address (CPUState *env, target_ulong *physical,
} else if (address < 0x3FFFFFFFFFFFFFFFULL) {
/* xuseg */
if (UX && address < 0x000000FFFFFFFFFFULL) {
ret = map_address(env, physical, prot, address, rw, access_type);
ret = env->map_address(env, physical, prot, address, rw, access_type);
} else {
ret = TLBRET_BADADDR;
}
} else if (address < 0x7FFFFFFFFFFFFFFFULL) {
/* xsseg */
if (SX && address < 0x400000FFFFFFFFFFULL) {
ret = map_address(env, physical, prot, address, rw, access_type);
ret = env->map_address(env, physical, prot, address, rw, access_type);
} else {
ret = TLBRET_BADADDR;
}
@ -148,7 +168,7 @@ static int get_physical_address (CPUState *env, target_ulong *physical,
/* xkseg */
/* XXX: check supervisor mode */
if (KX && address < 0xC00000FF7FFFFFFFULL) {
ret = map_address(env, physical, prot, address, rw, access_type);
ret = env->map_address(env, physical, prot, address, rw, access_type);
} else {
ret = TLBRET_BADADDR;
}
@ -165,22 +185,12 @@ static int get_physical_address (CPUState *env, target_ulong *physical,
*prot = PAGE_READ | PAGE_WRITE;
} else if (address < (int32_t)0xE0000000UL) {
/* kseg2 */
#ifdef MIPS_USES_R4K_TLB
ret = map_address(env, physical, prot, address, rw, access_type);
#else
*physical = address & 0xFFFFFFFF;
*prot = PAGE_READ | PAGE_WRITE;
#endif
ret = env->map_address(env, physical, prot, address, rw, access_type);
} else {
/* kseg3 */
/* XXX: check supervisor mode */
/* XXX: debug segment is not emulated */
#ifdef MIPS_USES_R4K_TLB
ret = map_address(env, physical, prot, address, rw, access_type);
#else
*physical = address & 0xFFFFFFFF;
*prot = PAGE_READ | PAGE_WRITE;
#endif
ret = env->map_address(env, physical, prot, address, rw, access_type);
}
#if 0
if (logfile) {
@ -483,15 +493,15 @@ void do_interrupt (CPUState *env)
}
#endif /* !defined(CONFIG_USER_ONLY) */
void invalidate_tlb (CPUState *env, int idx, int use_extra)
void r4k_invalidate_tlb (CPUState *env, int idx, int use_extra)
{
tlb_t *tlb;
r4k_tlb_t *tlb;
target_ulong addr;
target_ulong end;
uint8_t ASID = env->CP0_EntryHi & 0xFF;
target_ulong mask;
tlb = &env->tlb[idx];
tlb = &env->mmu.r4k.tlb[idx];
/* The qemu TLB is flushed then the ASID changes, so no need to
flush these entries again. */
if (tlb->G == 0 && tlb->ASID != ASID) {
@ -502,7 +512,7 @@ void invalidate_tlb (CPUState *env, int idx, int use_extra)
/* For tlbwr, we can shadow the discarded entry into
a new (fake) TLB entry, as long as the guest can not
tell that it's there. */
env->tlb[env->tlb_in_use] = *tlb;
env->mmu.r4k.tlb[env->tlb_in_use] = *tlb;
env->tlb_in_use++;
return;
}

2
target-mips/mips-defs.h
View File

@ -6,8 +6,6 @@
/* real pages are variable size... */
#define TARGET_PAGE_BITS 12
/* Uses MIPS R4Kc TLB model */
#define MIPS_USES_R4K_TLB
#define MIPS_TLB_MAX 128
#ifdef TARGET_MIPS64

17
target-mips/op.c
View File

@ -1411,12 +1411,7 @@ void op_mtc0_ebase (void)
void op_mtc0_config0 (void)
{
#if defined(MIPS_USES_R4K_TLB)
/* Fixed mapping MMU not implemented */
env->CP0_Config0 = (env->CP0_Config0 & 0x8017FF88) | (T0 & 0x00000001);
#else
env->CP0_Config0 = (env->CP0_Config0 & 0xFE17FF88) | (T0 & 0x00000001);
#endif
env->CP0_Config0 = (env->CP0_Config0 & 0x81FFFFF8) | (T0 & 0x00000001);
RETURN();
}
@ -2680,31 +2675,29 @@ void op_bc1tany4 (void)
RETURN();
}
#if defined(MIPS_USES_R4K_TLB)
void op_tlbwi (void)
{
CALL_FROM_TB0(do_tlbwi);
CALL_FROM_TB0(env->do_tlbwi);
RETURN();
}
void op_tlbwr (void)
{
CALL_FROM_TB0(do_tlbwr);
CALL_FROM_TB0(env->do_tlbwr);
RETURN();
}
void op_tlbp (void)
{
CALL_FROM_TB0(do_tlbp);
CALL_FROM_TB0(env->do_tlbp);
RETURN();
}
void op_tlbr (void)
{
CALL_FROM_TB0(do_tlbr);
CALL_FROM_TB0(env->do_tlbr);
RETURN();
}
#endif
/* Specials */
#if defined (CONFIG_USER_ONLY)

64
target-mips/op_helper.c
View File

@ -298,26 +298,6 @@ void do_mtc0_status_irqraise_debug (void)
cpu_abort(env, "mtc0 status irqraise debug\n");
}
void do_tlbwi (void)
{
cpu_abort(env, "tlbwi\n");
}
void do_tlbwr (void)
{
cpu_abort(env, "tlbwr\n");
}
void do_tlbp (void)
{
cpu_abort(env, "tlbp\n");
}
void do_tlbr (void)
{
cpu_abort(env, "tlbr\n");
}
void cpu_mips_tlb_flush (CPUState *env, int flush_global)
{
cpu_abort(env, "mips_tlb_flush\n");
@ -389,7 +369,6 @@ void fpu_handle_exception(void)
}
/* TLB management */
#if defined(MIPS_USES_R4K_TLB)
void cpu_mips_tlb_flush (CPUState *env, int flush_global)
{
/* Flush qemu's TLB and discard all shadowed entries. */
@ -397,20 +376,20 @@ void cpu_mips_tlb_flush (CPUState *env, int flush_global)
env->tlb_in_use = env->nb_tlb;
}
static void mips_tlb_flush_extra (CPUState *env, int first)
static void r4k_mips_tlb_flush_extra (CPUState *env, int first)
{
/* Discard entries from env->tlb[first] onwards. */
while (env->tlb_in_use > first) {
invalidate_tlb(env, --env->tlb_in_use, 0);
r4k_invalidate_tlb(env, --env->tlb_in_use, 0);
}
}
static void fill_tlb (int idx)
static void r4k_fill_tlb (int idx)
{
tlb_t *tlb;
r4k_tlb_t *tlb;
/* XXX: detect conflicting TLBs and raise a MCHECK exception when needed */
tlb = &env->tlb[idx];
tlb = &env->mmu.r4k.tlb[idx];
tlb->VPN = env->CP0_EntryHi & ~(target_ulong)0x1FFF;
tlb->ASID = env->CP0_EntryHi & 0xFF;
tlb->PageMask = env->CP0_PageMask;
@ -425,28 +404,28 @@ static void fill_tlb (int idx)
tlb->PFN[1] = (env->CP0_EntryLo1 >> 6) << 12;
}
void do_tlbwi (void)
void r4k_do_tlbwi (void)
{
/* Discard cached TLB entries. We could avoid doing this if the
tlbwi is just upgrading access permissions on the current entry;
that might be a further win. */
mips_tlb_flush_extra (env, env->nb_tlb);
r4k_mips_tlb_flush_extra (env, env->nb_tlb);
invalidate_tlb(env, env->CP0_Index % env->nb_tlb, 0);
fill_tlb(env->CP0_Index % env->nb_tlb);
r4k_invalidate_tlb(env, env->CP0_Index % env->nb_tlb, 0);
r4k_fill_tlb(env->CP0_Index % env->nb_tlb);
}
void do_tlbwr (void)
void r4k_do_tlbwr (void)
{
int r = cpu_mips_get_random(env);
invalidate_tlb(env, r, 1);
fill_tlb(r);
r4k_invalidate_tlb(env, r, 1);
r4k_fill_tlb(r);
}
void do_tlbp (void)
void r4k_do_tlbp (void)
{
tlb_t *tlb;
r4k_tlb_t *tlb;
target_ulong tag;
uint8_t ASID;
int i;
@ -454,7 +433,7 @@ void do_tlbp (void)
tag = env->CP0_EntryHi & (int32_t)0xFFFFE000;
ASID = env->CP0_EntryHi & 0xFF;
for (i = 0; i < env->nb_tlb; i++) {
tlb = &env->tlb[i];
tlb = &env->mmu.r4k.tlb[i];
/* Check ASID, virtual page number & size */
if ((tlb->G == 1 || tlb->ASID == ASID) && tlb->VPN == tag) {
/* TLB match */
@ -465,11 +444,11 @@ void do_tlbp (void)
if (i == env->nb_tlb) {
/* No match. Discard any shadow entries, if any of them match. */
for (i = env->nb_tlb; i < env->tlb_in_use; i++) {
tlb = &env->tlb[i];
tlb = &env->mmu.r4k.tlb[i];
/* Check ASID, virtual page number & size */
if ((tlb->G == 1 || tlb->ASID == ASID) && tlb->VPN == tag) {
mips_tlb_flush_extra (env, i);
r4k_mips_tlb_flush_extra (env, i);
break;
}
}
@ -478,19 +457,19 @@ void do_tlbp (void)
}
}
void do_tlbr (void)
void r4k_do_tlbr (void)
{
tlb_t *tlb;
r4k_tlb_t *tlb;
uint8_t ASID;
ASID = env->CP0_EntryHi & 0xFF;
tlb = &env->tlb[env->CP0_Index % env->nb_tlb];
tlb = &env->mmu.r4k.tlb[env->CP0_Index % env->nb_tlb];
/* If this will change the current ASID, flush qemu's TLB. */
if (ASID != tlb->ASID)
cpu_mips_tlb_flush (env, 1);
mips_tlb_flush_extra(env, env->nb_tlb);
r4k_mips_tlb_flush_extra(env, env->nb_tlb);
env->CP0_EntryHi = tlb->VPN | tlb->ASID;
env->CP0_PageMask = tlb->PageMask;
@ -499,7 +478,6 @@ void do_tlbr (void)
env->CP0_EntryLo1 = tlb->G | (tlb->V1 << 1) | (tlb->D1 << 2) |
(tlb->C1 << 3) | (tlb->PFN[1] >> 6);
}
#endif
#endif /* !CONFIG_USER_ONLY */

25
target-mips/translate.c
View File

@ -4164,7 +4164,7 @@ die:
}
#endif /* TARGET_MIPS64 */
static void gen_cp0 (DisasContext *ctx, uint32_t opc, int rt, int rd)
static void gen_cp0 (CPUState *env, DisasContext *ctx, uint32_t opc, int rt, int rd)
{
const char *opn = "ldst";
@ -4199,24 +4199,30 @@ static void gen_cp0 (DisasContext *ctx, uint32_t opc, int rt, int rd)
opn = "dmtc0";
break;
#endif
#if defined(MIPS_USES_R4K_TLB)
case OPC_TLBWI:
gen_op_tlbwi();
opn = "tlbwi";
if (!env->do_tlbwi)
goto die;
gen_op_tlbwi();
break;
case OPC_TLBWR:
gen_op_tlbwr();
opn = "tlbwr";
if (!env->do_tlbwr)
goto die;
gen_op_tlbwr();
break;
case OPC_TLBP:
gen_op_tlbp();
opn = "tlbp";
if (!env->do_tlbp)
goto die;
gen_op_tlbp();
break;
case OPC_TLBR:
gen_op_tlbr();
opn = "tlbr";
if (!env->do_tlbr)
goto die;
gen_op_tlbr();
break;
#endif
case OPC_ERET:
opn = "eret";
save_cpu_state(ctx, 0);
@ -4244,6 +4250,7 @@ static void gen_cp0 (DisasContext *ctx, uint32_t opc, int rt, int rd)
ctx->bstate = BS_EXCP;
break;
default:
die:
MIPS_INVAL(opn);
generate_exception(ctx, EXCP_RI);
return;
@ -5576,10 +5583,10 @@ static void decode_opc (CPUState *env, DisasContext *ctx)
case OPC_DMFC0:
case OPC_DMTC0:
#endif
gen_cp0(ctx, op1, rt, rd);
gen_cp0(env, ctx, op1, rt, rd);
break;
case OPC_C0_FIRST ... OPC_C0_LAST:
gen_cp0(ctx, MASK_C0(ctx->opcode), rt, rd);
gen_cp0(env, ctx, MASK_C0(ctx->opcode), rt, rd);
break;
case OPC_MFMC0:
op2 = MASK_MFMC0(ctx->opcode);

45
target-mips/translate_init.c
View File

@ -148,7 +148,7 @@ static mips_def_t mips_defs[] =
.Status_rw_bitmask = 0x3678FFFF,
.CP1_fcr0 = (1 << FCR0_F64) | (1 << FCR0_L) | (1 << FCR0_W) |
(1 << FCR0_D) | (1 << FCR0_S) |
(0x4 << FCR0_PRID) | (0x0 << FCR0_REV),
(0x5 << FCR0_PRID) | (0x0 << FCR0_REV),
},
#endif
};
@ -180,6 +180,30 @@ void mips_cpu_list (FILE *f, int (*cpu_fprintf)(FILE *f, const char *fmt, ...))
}
}
#ifndef CONFIG_USER_ONLY
static void no_mmu_init (CPUMIPSState *env, mips_def_t *def)
{
env->nb_tlb = 1;
env->map_address = &no_mmu_map_address;
}
static void fixed_mmu_init (CPUMIPSState *env, mips_def_t *def)
{
env->nb_tlb = 1;
env->map_address = &fixed_mmu_map_address;
}
static void r4k_mmu_init (CPUMIPSState *env, mips_def_t *def)
{
env->nb_tlb = 1 + ((def->CP0_Config1 >> CP0C1_MMU) & 63);
env->map_address = &r4k_map_address;
env->do_tlbwi = r4k_do_tlbwi;
env->do_tlbwr = r4k_do_tlbwr;
env->do_tlbp = r4k_do_tlbp;
env->do_tlbr = r4k_do_tlbr;
}
#endif /* CONFIG_USER_ONLY */
int cpu_mips_register (CPUMIPSState *env, mips_def_t *def)
{
if (!def)
@ -199,10 +223,23 @@ int cpu_mips_register (CPUMIPSState *env, mips_def_t *def)
env->CCRes = def->CCRes;
env->Status_rw_bitmask = def->Status_rw_bitmask;
env->fcr0 = def->CP1_fcr0;
#if defined (MIPS_USES_R4K_TLB)
env->nb_tlb = 1 + ((def->CP0_Config1 >> CP0C1_MMU) & 63);
#ifndef CONFIG_USER_ONLY
switch ((env->CP0_Config0 >> CP0C0_MT) & 3) {
case 0:
no_mmu_init(env, def);
break;
case 1:
r4k_mmu_init(env, def);
break;
case 3:
fixed_mmu_init(env, def);
break;
default:
/* Older CPUs like the R3000 may need nonstandard handling here. */
cpu_abort(env, "MMU type not supported\n");
}
env->CP0_Random = env->nb_tlb - 1;
env->tlb_in_use = env->nb_tlb;
#endif
#endif /* CONFIG_USER_ONLY */
return 0;
}