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Diffstat (limited to 'target-ppc/helper.c')
-rw-r--r--target-ppc/helper.c159
1 files changed, 142 insertions, 17 deletions
diff --git a/target-ppc/helper.c b/target-ppc/helper.c
index c835b1efe8..c541e7128b 100644
--- a/target-ppc/helper.c
+++ b/target-ppc/helper.c
@@ -549,8 +549,6 @@ static int get_segment (CPUState *env, mmu_ctx_t *ctx,
if (unlikely(PPC_MMU(env) == PPC_FLAGS_MMU_SOFT_6xx)) {
/* Software TLB search */
ret = ppc6xx_tlb_check(env, ctx, eaddr, rw, type);
- } else if (unlikely(PPC_MMU(env) == PPC_FLAGS_MMU_SOFT_4xx)) {
- /* XXX: TODO */
} else {
#if defined (DEBUG_MMU)
if (loglevel > 0) {
@@ -632,6 +630,115 @@ static int get_segment (CPUState *env, mmu_ctx_t *ctx,
return ret;
}
+int mmu4xx_get_physical_address (CPUState *env, mmu_ctx_t *ctx,
+ uint32_t address, int rw, int access_type)
+{
+ ppcemb_tlb_t *tlb;
+ target_phys_addr_t raddr;
+ target_ulong mask;
+ int i, ret, zsel, zpr;
+
+ ret = -6;
+ for (i = 0; i < env->nb_tlb; i++) {
+ tlb = &env->tlb[i].tlbe;
+ /* Check valid flag */
+ if (!(tlb->prot & PAGE_VALID)) {
+ if (loglevel)
+ fprintf(logfile, "%s: TLB %d not valid\n", __func__, i);
+ continue;
+ }
+ mask = ~(tlb->size - 1);
+ if (loglevel) {
+ fprintf(logfile, "%s: TLB %d address %08x PID %04x <=> "
+ "%08x %08x %04x\n",
+ __func__, i, address, env->spr[SPR_40x_PID],
+ tlb->EPN, mask, tlb->PID);
+ }
+ /* Check PID */
+ if (tlb->PID != 0 && tlb->PID != env->spr[SPR_40x_PID])
+ continue;
+ /* Check effective address */
+ if ((address & mask) != tlb->EPN)
+ continue;
+ raddr = (tlb->RPN & mask) | (address & ~mask);
+ zsel = (tlb->attr >> 4) & 0xF;
+ zpr = (env->spr[SPR_40x_ZPR] >> (28 - (2 * zsel))) & 0x3;
+ if (loglevel) {
+ fprintf(logfile, "%s: TLB %d zsel %d zpr %d rw %d attr %08x\n",
+ __func__, i, zsel, zpr, rw, tlb->attr);
+ }
+ if (access_type == ACCESS_CODE) {
+ /* Check execute enable bit */
+ switch (zpr) {
+ case 0x0:
+ if (msr_pr) {
+ ret = -3;
+ ctx->prot = 0;
+ break;
+ }
+ /* No break here */
+ case 0x1:
+ case 0x2:
+ /* Check from TLB entry */
+ if (!(tlb->prot & PAGE_EXEC)) {
+ ret = -3;
+ } else {
+ if (tlb->prot & PAGE_WRITE)
+ ctx->prot = PAGE_READ | PAGE_WRITE;
+ else
+ ctx->prot = PAGE_READ;
+ ret = 0;
+ }
+ break;
+ case 0x3:
+ /* All accesses granted */
+ ret = 0;
+ ctx->prot = PAGE_READ | PAGE_WRITE;
+ break;
+ }
+ } else {
+ switch (zpr) {
+ case 0x0:
+ if (msr_pr) {
+ ret = -2;
+ ctx->prot = 0;
+ break;
+ }
+ /* No break here */
+ case 0x1:
+ case 0x2:
+ /* Check from TLB entry */
+ /* Check write protection bit */
+ if (rw && !(tlb->prot & PAGE_WRITE)) {
+ ret = -2;
+ } else {
+ ret = 2;
+ if (tlb->prot & PAGE_WRITE)
+ ctx->prot = PAGE_READ | PAGE_WRITE;
+ else
+ ctx->prot = PAGE_READ;
+ }
+ break;
+ case 0x3:
+ /* All accesses granted */
+ ret = 2;
+ ctx->prot = PAGE_READ | PAGE_WRITE;
+ break;
+ }
+ }
+ if (ret >= 0) {
+ ctx->raddr = raddr;
+ if (loglevel) {
+ fprintf(logfile, "%s: access granted " ADDRX " => " REGX
+ " %d\n", __func__, address, ctx->raddr, ctx->prot);
+ }
+ return i;
+ }
+ }
+
+ return ret;
+}
+
static int check_physical (CPUState *env, mmu_ctx_t *ctx,
target_ulong eaddr, int rw)
{
@@ -682,13 +789,26 @@ int get_physical_address (CPUState *env, mmu_ctx_t *ctx, target_ulong eaddr,
/* No address translation */
ret = check_physical(env, ctx, eaddr, rw);
} else {
- /* Try to find a BAT */
- ret = -1;
- if (check_BATs)
- ret = get_bat(env, ctx, eaddr, rw, access_type);
- if (ret < 0) {
- /* We didn't match any BAT entry */
- ret = get_segment(env, ctx, eaddr, rw, access_type);
+ switch (PPC_MMU(env)) {
+ case PPC_FLAGS_MMU_32B:
+ case PPC_FLAGS_MMU_SOFT_6xx:
+ /* Try to find a BAT */
+ ret = -1;
+ if (check_BATs)
+ ret = get_bat(env, ctx, eaddr, rw, access_type);
+ if (ret < 0) {
+ /* We didn't match any BAT entry */
+ ret = get_segment(env, ctx, eaddr, rw, access_type);
+ }
+ break;
+ case PPC_FLAGS_MMU_SOFT_4xx:
+ ret = mmu4xx_get_physical_address(env, ctx, eaddr,
+ rw, access_type);
+ break;
+ default:
+ /* XXX: TODO */
+ cpu_abort(env, "MMU model not implemented\n");
+ return -1;
}
}
#if 0
@@ -753,7 +873,10 @@ int cpu_ppc_handle_mmu_fault (CPUState *env, uint32_t address, int rw,
error_code = 1 << 18;
goto tlb_miss;
} else if (unlikely(PPC_MMU(env) == PPC_FLAGS_MMU_SOFT_4xx)) {
- /* XXX: TODO */
+ exception = EXCP_40x_ITLBMISS;
+ error_code = 0;
+ env->spr[SPR_40x_DEAR] = address;
+ env->spr[SPR_40x_ESR] = 0x00000000;
} else {
error_code = 0x40000000;
}
@@ -799,7 +922,13 @@ int cpu_ppc_handle_mmu_fault (CPUState *env, uint32_t address, int rw,
/* Do not alter DAR nor DSISR */
goto out;
} else if (unlikely(PPC_MMU(env) == PPC_FLAGS_MMU_SOFT_4xx)) {
- /* XXX: TODO */
+ exception = EXCP_40x_DTLBMISS;
+ error_code = 0;
+ env->spr[SPR_40x_DEAR] = address;
+ if (rw)
+ env->spr[SPR_40x_ESR] = 0x00800000;
+ else
+ env->spr[SPR_40x_ESR] = 0x00000000;
} else {
error_code = 0x40000000;
}
@@ -1518,9 +1647,7 @@ void do_interrupt (CPUState *env)
switch (PPC_EXCP(env)) {
case PPC_FLAGS_EXCP_40x:
/* DTLBMISS on 4xx */
- /* XXX: TODO */
- cpu_abort(env,
- "40x DTLBMISS exception is not implemented yet !\n");
+ msr &= ~0xFFFF0000;
goto store_next;
case PPC_FLAGS_EXCP_602:
case PPC_FLAGS_EXCP_603:
@@ -1538,9 +1665,7 @@ void do_interrupt (CPUState *env)
switch (PPC_EXCP(env)) {
case PPC_FLAGS_EXCP_40x:
/* ITLBMISS on 4xx */
- /* XXX: TODO */
- cpu_abort(env,
- "40x ITLBMISS exception is not implemented yet !\n");
+ msr &= ~0xFFFF0000;
goto store_next;
case PPC_FLAGS_EXCP_602:
case PPC_FLAGS_EXCP_603:
generated by cgit v1.2.3 (git 2.26.2) at 2025-01-06 00:21:15 +0000