Commit fcb4a419 authored by ths's avatar ths
Browse files

Choose number of TLBs at runtime, by Herve Poussineau.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2693 c046a42c-6fe2-441c-8c8c-71466251a162
parent 04f20795
......@@ -10,7 +10,7 @@ uint32_t cpu_mips_get_random (CPUState *env)
static uint32_t seed = 0;
uint32_t idx;
seed = seed * 314159 + 1;
idx = (seed >> 16) % (MIPS_TLB_NB - env->CP0_Wired) + env->CP0_Wired;
idx = (seed >> 16) % (env->nb_tlb - env->CP0_Wired) + env->CP0_Wired;
return idx;
}
......
......@@ -99,6 +99,7 @@ struct CPUMIPSState {
#if defined(MIPS_USES_R4K_TLB)
tlb_t tlb[MIPS_TLB_MAX];
uint32_t tlb_in_use;
uint32_t nb_tlb;
#endif
int32_t CP0_Index;
int32_t CP0_Random;
......
......@@ -10,7 +10,6 @@
#define TARGET_PAGE_BITS 12
/* Uses MIPS R4Kc TLB model */
#define MIPS_USES_R4K_TLB
#define MIPS_TLB_NB 16
#define MIPS_TLB_MAX 128
#ifdef TARGET_MIPS64
......
......@@ -1270,7 +1270,7 @@ void op_mfc0_desave (void)
void op_mtc0_index (void)
{
env->CP0_Index = (env->CP0_Index & 0x80000000) | (T0 & (MIPS_TLB_NB - 1));
env->CP0_Index = (env->CP0_Index & 0x80000000) | (T0 % env->nb_tlb);
RETURN();
}
......@@ -1314,7 +1314,7 @@ void op_mtc0_pagegrain (void)
void op_mtc0_wired (void)
{
env->CP0_Wired = T0 & (MIPS_TLB_NB - 1);
env->CP0_Wired = T0 % env->nb_tlb;
RETURN();
}
......
......@@ -394,7 +394,7 @@ void cpu_mips_tlb_flush (CPUState *env, int flush_global)
{
/* Flush qemu's TLB and discard all shadowed entries. */
tlb_flush (env, flush_global);
env->tlb_in_use = MIPS_TLB_NB;
env->tlb_in_use = env->nb_tlb;
}
static void mips_tlb_flush_extra (CPUState *env, int first)
......@@ -430,12 +430,10 @@ void 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, MIPS_TLB_NB);
mips_tlb_flush_extra (env, env->nb_tlb);
/* Wildly undefined effects for CP0_Index containing a too high value and
MIPS_TLB_NB not being a power of two. But so does real silicon. */
invalidate_tlb(env, env->CP0_Index & (MIPS_TLB_NB - 1), 0);
fill_tlb(env->CP0_Index & (MIPS_TLB_NB - 1));
invalidate_tlb(env, env->CP0_Index % env->nb_tlb, 0);
fill_tlb(env->CP0_Index % env->nb_tlb);
}
void do_tlbwr (void)
......@@ -455,7 +453,7 @@ void do_tlbp (void)
tag = env->CP0_EntryHi & (int32_t)0xFFFFE000;
ASID = env->CP0_EntryHi & 0xFF;
for (i = 0; i < MIPS_TLB_NB; i++) {
for (i = 0; i < env->nb_tlb; i++) {
tlb = &env->tlb[i];
/* Check ASID, virtual page number & size */
if ((tlb->G == 1 || tlb->ASID == ASID) && tlb->VPN == tag) {
......@@ -464,9 +462,9 @@ void do_tlbp (void)
break;
}
}
if (i == MIPS_TLB_NB) {
if (i == env->nb_tlb) {
/* No match. Discard any shadow entries, if any of them match. */
for (i = MIPS_TLB_NB; i < env->tlb_in_use; i++) {
for (i = env->nb_tlb; i < env->tlb_in_use; i++) {
tlb = &env->tlb[i];
/* Check ASID, virtual page number & size */
......@@ -486,13 +484,13 @@ void do_tlbr (void)
uint8_t ASID;
ASID = env->CP0_EntryHi & 0xFF;
tlb = &env->tlb[env->CP0_Index & (MIPS_TLB_NB - 1)];
tlb = &env->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, MIPS_TLB_NB);
mips_tlb_flush_extra(env, env->nb_tlb);
env->CP0_EntryHi = tlb->VPN | tlb->ASID;
env->CP0_PageMask = tlb->PageMask;
......
......@@ -5430,10 +5430,6 @@ void cpu_reset (CPUMIPSState *env)
}
env->hflags = 0;
env->PC = (int32_t)0xBFC00000;
#if defined (MIPS_USES_R4K_TLB)
env->CP0_Random = MIPS_TLB_NB - 1;
env->tlb_in_use = MIPS_TLB_NB;
#endif
env->CP0_Wired = 0;
/* SMP not implemented */
env->CP0_EBase = 0x80000000;
......
......@@ -28,13 +28,13 @@
(0x0 << CP0C0_AT) | (0x0 << CP0C0_AR) | (0x1 << CP0C0_MT) | \
(0x2 << CP0C0_K0))
/* Have config2, 16 TLB entries, 64 sets Icache, 16 bytes Icache line,
/* Have config2, 64 sets Icache, 16 bytes Icache line,
2-way Icache, 64 sets Dcache, 16 bytes Dcache line, 2-way Dcache,
no coprocessor2 attached, no MDMX support attached,
no performance counters, watch registers present,
no code compression, EJTAG present, no FPU */
#define MIPS_CONFIG1 \
((1 << CP0C1_M) | ((MIPS_TLB_NB - 1) << CP0C1_MMU) | \
((1 << CP0C1_M) | \
(0x0 << CP0C1_IS) | (0x3 << CP0C1_IL) | (0x1 << CP0C1_IA) | \
(0x0 << CP0C1_DS) | (0x3 << CP0C1_DL) | (0x1 << CP0C1_DA) | \
(0 << CP0C1_C2) | (0 << CP0C1_MD) | (0 << CP0C1_PC) | \
......@@ -81,7 +81,7 @@ static mips_def_t mips_defs[] =
.name = "4Kc",
.CP0_PRid = 0x00018000,
.CP0_Config0 = MIPS_CONFIG0,
.CP0_Config1 = MIPS_CONFIG1,
.CP0_Config1 = MIPS_CONFIG1 | (15 << CP0C1_MMU),
.CP0_Config2 = MIPS_CONFIG2,
.CP0_Config3 = MIPS_CONFIG3,
.SYNCI_Step = 32,
......@@ -92,7 +92,7 @@ static mips_def_t mips_defs[] =
.name = "4KEcR1",
.CP0_PRid = 0x00018400,
.CP0_Config0 = MIPS_CONFIG0,
.CP0_Config1 = MIPS_CONFIG1,
.CP0_Config1 = MIPS_CONFIG1 | (15 << CP0C1_MMU),
.CP0_Config2 = MIPS_CONFIG2,
.CP0_Config3 = MIPS_CONFIG3,
.SYNCI_Step = 32,
......@@ -103,7 +103,7 @@ static mips_def_t mips_defs[] =
.name = "4KEc",
.CP0_PRid = 0x00019000,
.CP0_Config0 = MIPS_CONFIG0 | (0x1 << CP0C0_AR),
.CP0_Config1 = MIPS_CONFIG1,
.CP0_Config1 = MIPS_CONFIG1 | (15 << CP0C1_MMU),
.CP0_Config2 = MIPS_CONFIG2,
.CP0_Config3 = MIPS_CONFIG3,
.SYNCI_Step = 32,
......@@ -114,7 +114,7 @@ static mips_def_t mips_defs[] =
.name = "24Kc",
.CP0_PRid = 0x00019300,
.CP0_Config0 = MIPS_CONFIG0 | (0x1 << CP0C0_AR),
.CP0_Config1 = MIPS_CONFIG1,
.CP0_Config1 = MIPS_CONFIG1 | (15 << CP0C1_MMU),
.CP0_Config2 = MIPS_CONFIG2,
.CP0_Config3 = MIPS_CONFIG3,
.SYNCI_Step = 32,
......@@ -125,7 +125,7 @@ static mips_def_t mips_defs[] =
.name = "24Kf",
.CP0_PRid = 0x00019300,
.CP0_Config0 = MIPS_CONFIG0 | (0x1 << CP0C0_AR),
.CP0_Config1 = MIPS_CONFIG1 | (1 << CP0C1_FP),
.CP0_Config1 = MIPS_CONFIG1 | (1 << CP0C1_FP) | (15 << CP0C1_MMU),
.CP0_Config2 = MIPS_CONFIG2,
.CP0_Config3 = MIPS_CONFIG3,
.SYNCI_Step = 32,
......@@ -137,7 +137,7 @@ static mips_def_t mips_defs[] =
.name = "R4000",
.CP0_PRid = 0x00000400,
.CP0_Config0 = MIPS_CONFIG0 | (0x2 << CP0C0_AT),
.CP0_Config1 = MIPS_CONFIG1 | (1 << CP0C1_FP),
.CP0_Config1 = MIPS_CONFIG1 | (1 << CP0C1_FP) | (47 << CP0C1_MMU),
.CP0_Config2 = MIPS_CONFIG2,
.CP0_Config3 = MIPS_CONFIG3,
.SYNCI_Step = 16,
......@@ -192,5 +192,10 @@ int cpu_mips_register (CPUMIPSState *env, mips_def_t *def)
env->SYNCI_Step = def->SYNCI_Step;
env->CCRes = def->CCRes;
env->fcr0 = def->CP1_fcr0;
#if defined (MIPS_USES_R4K_TLB)
env->nb_tlb = 1 + ((def->CP0_Config1 >> CP0C1_MMU) & 63);
env->CP0_Random = env->nb_tlb - 1;
env->tlb_in_use = env->nb_tlb;
#endif
return 0;
}
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