* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
+#include "qemu/osdep.h"
#include "cpu.h"
-#include "helper.h"
+#include "exec/helper-proto.h"
#include "sysemu/kvm.h"
#include "kvm_ppc.h"
#include "mmu-hash32.h"
-//#define DEBUG_MMU
+//#define DEBUG_BAT
-#ifdef DEBUG_MMU
-# define LOG_MMU(...) qemu_log(__VA_ARGS__)
-# define LOG_MMU_STATE(env) log_cpu_state((env), 0)
+#ifdef DEBUG_BATS
+# define LOG_BATS(...) qemu_log_mask(CPU_LOG_MMU, __VA_ARGS__)
#else
-# define LOG_MMU(...) do { } while (0)
-# define LOG_MMU_STATE(...) do { } while (0)
+# define LOG_BATS(...) do { } while (0)
#endif
-#define PTE_PTEM_MASK 0x7FFFFFBF
-#define PTE_CHECK_MASK (TARGET_PAGE_MASK | 0x7B)
+struct mmu_ctx_hash32 {
+ hwaddr raddr; /* Real address */
+ int prot; /* Protection bits */
+ int key; /* Access key */
+};
-static int ppc_hash32_pp_check(int key, int pp, int nx)
+static int ppc_hash32_pp_prot(int key, int pp, int nx)
{
- int access;
+ int prot;
- /* Compute access rights */
- access = 0;
if (key == 0) {
switch (pp) {
case 0x0:
case 0x1:
case 0x2:
- access |= PAGE_WRITE;
- /* No break here */
+ prot = PAGE_READ | PAGE_WRITE;
+ break;
+
case 0x3:
- access |= PAGE_READ;
+ prot = PAGE_READ;
break;
+
+ default:
+ abort();
}
} else {
switch (pp) {
case 0x0:
- access = 0;
+ prot = 0;
break;
+
case 0x1:
case 0x3:
- access = PAGE_READ;
+ prot = PAGE_READ;
break;
+
case 0x2:
- access = PAGE_READ | PAGE_WRITE;
+ prot = PAGE_READ | PAGE_WRITE;
break;
+
+ default:
+ abort();
}
}
if (nx == 0) {
- access |= PAGE_EXEC;
+ prot |= PAGE_EXEC;
}
- return access;
+ return prot;
}
-static int ppc_hash32_check_prot(int prot, int rw, int access_type)
+static int ppc_hash32_pte_prot(CPUPPCState *env,
+ target_ulong sr, ppc_hash_pte32_t pte)
{
- int ret;
+ unsigned pp, key;
- if (access_type == ACCESS_CODE) {
- if (prot & PAGE_EXEC) {
- ret = 0;
- } else {
- ret = -2;
- }
- } else if (rw) {
- if (prot & PAGE_WRITE) {
- ret = 0;
- } else {
- ret = -2;
- }
- } else {
- if (prot & PAGE_READ) {
- ret = 0;
- } else {
- ret = -2;
+ key = !!(msr_pr ? (sr & SR32_KP) : (sr & SR32_KS));
+ pp = pte.pte1 & HPTE32_R_PP;
+
+ return ppc_hash32_pp_prot(key, pp, !!(sr & SR32_NX));
+}
+
+static target_ulong hash32_bat_size(CPUPPCState *env,
+ target_ulong batu, target_ulong batl)
+{
+ if ((msr_pr && !(batu & BATU32_VP))
+ || (!msr_pr && !(batu & BATU32_VS))) {
+ return 0;
+ }
+
+ return BATU32_BEPI & ~((batu & BATU32_BL) << 15);
+}
+
+static int hash32_bat_prot(CPUPPCState *env,
+ target_ulong batu, target_ulong batl)
+{
+ int pp, prot;
+
+ prot = 0;
+ pp = batl & BATL32_PP;
+ if (pp != 0) {
+ prot = PAGE_READ | PAGE_EXEC;
+ if (pp == 0x2) {
+ prot |= PAGE_WRITE;
}
}
+ return prot;
+}
+
+static target_ulong hash32_bat_601_size(CPUPPCState *env,
+ target_ulong batu, target_ulong batl)
+{
+ if (!(batl & BATL32_601_V)) {
+ return 0;
+ }
- return ret;
+ return BATU32_BEPI & ~((batl & BATL32_601_BL) << 17);
}
-static inline int pte_is_valid_hash32(target_ulong pte0)
+static int hash32_bat_601_prot(CPUPPCState *env,
+ target_ulong batu, target_ulong batl)
{
- return pte0 & 0x80000000 ? 1 : 0;
+ int key, pp;
+
+ pp = batu & BATU32_601_PP;
+ if (msr_pr == 0) {
+ key = !!(batu & BATU32_601_KS);
+ } else {
+ key = !!(batu & BATU32_601_KP);
+ }
+ return ppc_hash32_pp_prot(key, pp, 0);
}
-static int pte_check_hash32(mmu_ctx_t *ctx, target_ulong pte0,
- target_ulong pte1, int h, int rw, int type)
+static hwaddr ppc_hash32_bat_lookup(CPUPPCState *env, target_ulong ea, int rwx,
+ int *prot)
{
- target_ulong ptem, mmask;
- int access, ret, pteh, ptev, pp;
-
- ret = -1;
- /* Check validity and table match */
- ptev = pte_is_valid_hash32(pte0);
- pteh = (pte0 >> 6) & 1;
- if (ptev && h == pteh) {
- /* Check vsid & api */
- ptem = pte0 & PTE_PTEM_MASK;
- mmask = PTE_CHECK_MASK;
- pp = pte1 & 0x00000003;
- if (ptem == ctx->ptem) {
- if (ctx->raddr != (hwaddr)-1ULL) {
- /* all matches should have equal RPN, WIMG & PP */
- if ((ctx->raddr & mmask) != (pte1 & mmask)) {
- qemu_log("Bad RPN/WIMG/PP\n");
- return -3;
- }
- }
- /* Compute access rights */
- access = ppc_hash32_pp_check(ctx->key, pp, ctx->nx);
- /* Keep the matching PTE informations */
- ctx->raddr = pte1;
- ctx->prot = access;
- ret = ppc_hash32_check_prot(ctx->prot, rw, type);
- if (ret == 0) {
- /* Access granted */
- LOG_MMU("PTE access granted !\n");
+ target_ulong *BATlt, *BATut;
+ int i;
+
+ LOG_BATS("%s: %cBAT v " TARGET_FMT_lx "\n", __func__,
+ rwx == 2 ? 'I' : 'D', ea);
+ if (rwx == 2) {
+ BATlt = env->IBAT[1];
+ BATut = env->IBAT[0];
+ } else {
+ BATlt = env->DBAT[1];
+ BATut = env->DBAT[0];
+ }
+ for (i = 0; i < env->nb_BATs; i++) {
+ target_ulong batu = BATut[i];
+ target_ulong batl = BATlt[i];
+ target_ulong mask;
+
+ if (unlikely(env->mmu_model == POWERPC_MMU_601)) {
+ mask = hash32_bat_601_size(env, batu, batl);
+ } else {
+ mask = hash32_bat_size(env, batu, batl);
+ }
+ LOG_BATS("%s: %cBAT%d v " TARGET_FMT_lx " BATu " TARGET_FMT_lx
+ " BATl " TARGET_FMT_lx "\n", __func__,
+ type == ACCESS_CODE ? 'I' : 'D', i, ea, batu, batl);
+
+ if (mask && ((ea & mask) == (batu & BATU32_BEPI))) {
+ hwaddr raddr = (batl & mask) | (ea & ~mask);
+
+ if (unlikely(env->mmu_model == POWERPC_MMU_601)) {
+ *prot = hash32_bat_601_prot(env, batu, batl);
} else {
- /* Access right violation */
- LOG_MMU("PTE access rejected\n");
+ *prot = hash32_bat_prot(env, batu, batl);
}
+
+ return raddr & TARGET_PAGE_MASK;
+ }
+ }
+
+ /* No hit */
+#if defined(DEBUG_BATS)
+ if (qemu_log_enabled()) {
+ LOG_BATS("no BAT match for " TARGET_FMT_lx ":\n", ea);
+ for (i = 0; i < 4; i++) {
+ BATu = &BATut[i];
+ BATl = &BATlt[i];
+ BEPIu = *BATu & BATU32_BEPIU;
+ BEPIl = *BATu & BATU32_BEPIL;
+ bl = (*BATu & 0x00001FFC) << 15;
+ LOG_BATS("%s: %cBAT%d v " TARGET_FMT_lx " BATu " TARGET_FMT_lx
+ " BATl " TARGET_FMT_lx "\n\t" TARGET_FMT_lx " "
+ TARGET_FMT_lx " " TARGET_FMT_lx "\n",
+ __func__, type == ACCESS_CODE ? 'I' : 'D', i, ea,
+ *BATu, *BATl, BEPIu, BEPIl, bl);
}
}
+#endif
- return ret;
+ return -1;
}
-static int ppc_hash32_pte_update_flags(mmu_ctx_t *ctx, target_ulong *pte1p,
- int ret, int rw)
+static int ppc_hash32_direct_store(CPUPPCState *env, target_ulong sr,
+ target_ulong eaddr, int rwx,
+ hwaddr *raddr, int *prot)
{
- int store = 0;
+ CPUState *cs = CPU(ppc_env_get_cpu(env));
+ int key = !!(msr_pr ? (sr & SR32_KP) : (sr & SR32_KS));
+
+ qemu_log_mask(CPU_LOG_MMU, "direct store...\n");
+
+ if ((sr & 0x1FF00000) >> 20 == 0x07f) {
+ /* Memory-forced I/O controller interface access */
+ /* If T=1 and BUID=x'07F', the 601 performs a memory access
+ * to SR[28-31] LA[4-31], bypassing all protection mechanisms.
+ */
+ *raddr = ((sr & 0xF) << 28) | (eaddr & 0x0FFFFFFF);
+ *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
+ return 0;
+ }
- /* Update page flags */
- if (!(*pte1p & 0x00000100)) {
- /* Update accessed flag */
- *pte1p |= 0x00000100;
- store = 1;
+ if (rwx == 2) {
+ /* No code fetch is allowed in direct-store areas */
+ cs->exception_index = POWERPC_EXCP_ISI;
+ env->error_code = 0x10000000;
+ return 1;
}
- if (!(*pte1p & 0x00000080)) {
- if (rw == 1 && ret == 0) {
- /* Update changed flag */
- *pte1p |= 0x00000080;
- store = 1;
+
+ switch (env->access_type) {
+ case ACCESS_INT:
+ /* Integer load/store : only access allowed */
+ break;
+ case ACCESS_FLOAT:
+ /* Floating point load/store */
+ cs->exception_index = POWERPC_EXCP_ALIGN;
+ env->error_code = POWERPC_EXCP_ALIGN_FP;
+ env->spr[SPR_DAR] = eaddr;
+ return 1;
+ case ACCESS_RES:
+ /* lwarx, ldarx or srwcx. */
+ env->error_code = 0;
+ env->spr[SPR_DAR] = eaddr;
+ if (rwx == 1) {
+ env->spr[SPR_DSISR] = 0x06000000;
+ } else {
+ env->spr[SPR_DSISR] = 0x04000000;
+ }
+ return 1;
+ case ACCESS_CACHE:
+ /* dcba, dcbt, dcbtst, dcbf, dcbi, dcbst, dcbz, or icbi */
+ /* Should make the instruction do no-op.
+ * As it already do no-op, it's quite easy :-)
+ */
+ *raddr = eaddr;
+ return 0;
+ case ACCESS_EXT:
+ /* eciwx or ecowx */
+ cs->exception_index = POWERPC_EXCP_DSI;
+ env->error_code = 0;
+ env->spr[SPR_DAR] = eaddr;
+ if (rwx == 1) {
+ env->spr[SPR_DSISR] = 0x06100000;
} else {
- /* Force page fault for first write access */
- ctx->prot &= ~PAGE_WRITE;
+ env->spr[SPR_DSISR] = 0x04100000;
}
+ return 1;
+ default:
+ cpu_abort(cs, "ERROR: instruction should not need "
+ "address translation\n");
+ }
+ if ((rwx == 1 || key != 1) && (rwx == 0 || key != 0)) {
+ *raddr = eaddr;
+ return 0;
+ } else {
+ cs->exception_index = POWERPC_EXCP_DSI;
+ env->error_code = 0;
+ env->spr[SPR_DAR] = eaddr;
+ if (rwx == 1) {
+ env->spr[SPR_DSISR] = 0x0a000000;
+ } else {
+ env->spr[SPR_DSISR] = 0x08000000;
+ }
+ return 1;
}
-
- return store;
}
hwaddr get_pteg_offset32(CPUPPCState *env, hwaddr hash)
{
- return (hash * HASH_PTE_SIZE_32 * 8) & env->htab_mask;
+ return (hash * HASH_PTEG_SIZE_32) & env->htab_mask;
}
-/* PTE table lookup */
-static int find_pte32(CPUPPCState *env, mmu_ctx_t *ctx, int h,
- int rw, int type, int target_page_bits)
+static hwaddr ppc_hash32_pteg_search(CPUPPCState *env, hwaddr pteg_off,
+ bool secondary, target_ulong ptem,
+ ppc_hash_pte32_t *pte)
{
- hwaddr pteg_off;
+ hwaddr pte_offset = pteg_off;
target_ulong pte0, pte1;
- int i, good = -1;
- int ret, r;
-
- ret = -1; /* No entry found */
- pteg_off = get_pteg_offset32(env, ctx->hash[h]);
- for (i = 0; i < 8; i++) {
- if (env->external_htab) {
- pte0 = ldl_p(env->external_htab + pteg_off + (i * 8));
- pte1 = ldl_p(env->external_htab + pteg_off + (i * 8) + 4);
- } else {
- pte0 = ldl_phys(env->htab_base + pteg_off + (i * 8));
- pte1 = ldl_phys(env->htab_base + pteg_off + (i * 8) + 4);
- }
- r = pte_check_hash32(ctx, pte0, pte1, h, rw, type);
- LOG_MMU("Load pte from %08" HWADDR_PRIx " => " TARGET_FMT_lx " "
- TARGET_FMT_lx " %d %d %d " TARGET_FMT_lx "\n",
- pteg_off + (i * 8), pte0, pte1, (int)(pte0 >> 31), h,
- (int)((pte0 >> 6) & 1), ctx->ptem);
- switch (r) {
- case -3:
- /* PTE inconsistency */
- return -1;
- case -2:
- /* Access violation */
- ret = -2;
- good = i;
- break;
- case -1:
- default:
- /* No PTE match */
- break;
- case 0:
- /* access granted */
- /* XXX: we should go on looping to check all PTEs consistency
- * but if we can speed-up the whole thing as the
- * result would be undefined if PTEs are not consistent.
- */
- ret = 0;
- good = i;
- goto done;
+ int i;
+
+ for (i = 0; i < HPTES_PER_GROUP; i++) {
+ pte0 = ppc_hash32_load_hpte0(env, pte_offset);
+ pte1 = ppc_hash32_load_hpte1(env, pte_offset);
+
+ if ((pte0 & HPTE32_V_VALID)
+ && (secondary == !!(pte0 & HPTE32_V_SECONDARY))
+ && HPTE32_V_COMPARE(pte0, ptem)) {
+ pte->pte0 = pte0;
+ pte->pte1 = pte1;
+ return pte_offset;
}
- }
- if (good != -1) {
- done:
- LOG_MMU("found PTE at addr %08" HWADDR_PRIx " prot=%01x ret=%d\n",
- ctx->raddr, ctx->prot, ret);
- /* Update page flags */
- pte1 = ctx->raddr;
- if (ppc_hash32_pte_update_flags(ctx, &pte1, ret, rw) == 1) {
- if (env->external_htab) {
- stl_p(env->external_htab + pteg_off + (good * 8) + 4,
- pte1);
- } else {
- stl_phys_notdirty(env->htab_base + pteg_off +
- (good * 8) + 4, pte1);
- }
- }
- }
- /* We have a TLB that saves 4K pages, so let's
- * split a huge page to 4k chunks */
- if (target_page_bits != TARGET_PAGE_BITS) {
- ctx->raddr |= (ctx->eaddr & ((1 << target_page_bits) - 1))
- & TARGET_PAGE_MASK;
+ pte_offset += HASH_PTE_SIZE_32;
}
- return ret;
+
+ return -1;
}
-static int get_segment32(CPUPPCState *env, mmu_ctx_t *ctx,
- target_ulong eaddr, int rw, int type)
+static hwaddr ppc_hash32_htab_lookup(CPUPPCState *env,
+ target_ulong sr, target_ulong eaddr,
+ ppc_hash_pte32_t *pte)
{
+ hwaddr pteg_off, pte_offset;
hwaddr hash;
- target_ulong vsid;
- int ds, pr, target_page_bits;
- int ret, ret2;
- target_ulong sr, pgidx;
-
- pr = msr_pr;
- ctx->eaddr = eaddr;
+ uint32_t vsid, pgidx, ptem;
- sr = env->sr[eaddr >> 28];
- ctx->key = (((sr & 0x20000000) && (pr != 0)) ||
- ((sr & 0x40000000) && (pr == 0))) ? 1 : 0;
- ds = sr & 0x80000000 ? 1 : 0;
- ctx->nx = sr & 0x10000000 ? 1 : 0;
- vsid = sr & 0x00FFFFFF;
- target_page_bits = TARGET_PAGE_BITS;
- LOG_MMU("Check segment v=" TARGET_FMT_lx " %d " TARGET_FMT_lx " nip="
- TARGET_FMT_lx " lr=" TARGET_FMT_lx
- " ir=%d dr=%d pr=%d %d t=%d\n",
- eaddr, (int)(eaddr >> 28), sr, env->nip, env->lr, (int)msr_ir,
- (int)msr_dr, pr != 0 ? 1 : 0, rw, type);
- pgidx = (eaddr & ~SEGMENT_MASK_256M) >> target_page_bits;
+ vsid = sr & SR32_VSID;
+ pgidx = (eaddr & ~SEGMENT_MASK_256M) >> TARGET_PAGE_BITS;
hash = vsid ^ pgidx;
- ctx->ptem = (vsid << 7) | (pgidx >> 10);
-
- LOG_MMU("pte segment: key=%d ds %d nx %d vsid " TARGET_FMT_lx "\n",
- ctx->key, ds, ctx->nx, vsid);
- ret = -1;
- if (!ds) {
- /* Check if instruction fetch is allowed, if needed */
- if (type != ACCESS_CODE || ctx->nx == 0) {
- /* Page address translation */
- LOG_MMU("htab_base " TARGET_FMT_plx " htab_mask " TARGET_FMT_plx
- " hash " TARGET_FMT_plx "\n",
- env->htab_base, env->htab_mask, hash);
- ctx->hash[0] = hash;
- ctx->hash[1] = ~hash;
-
- /* Initialize real address with an invalid value */
- ctx->raddr = (hwaddr)-1ULL;
- LOG_MMU("0 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
- " vsid=" TARGET_FMT_lx " ptem=" TARGET_FMT_lx
- " hash=" TARGET_FMT_plx "\n",
- env->htab_base, env->htab_mask, vsid, ctx->ptem,
- ctx->hash[0]);
- /* Primary table lookup */
- ret = find_pte32(env, ctx, 0, rw, type, target_page_bits);
- if (ret < 0) {
- /* Secondary table lookup */
- LOG_MMU("1 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
- " vsid=" TARGET_FMT_lx " api=" TARGET_FMT_lx
- " hash=" TARGET_FMT_plx "\n", env->htab_base,
- env->htab_mask, vsid, ctx->ptem, ctx->hash[1]);
- ret2 = find_pte32(env, ctx, 1, rw, type,
- target_page_bits);
- if (ret2 != -1) {
- ret = ret2;
- }
- }
-#if defined(DUMP_PAGE_TABLES)
- if (qemu_log_enabled()) {
- hwaddr curaddr;
- uint32_t a0, a1, a2, a3;
-
- qemu_log("Page table: " TARGET_FMT_plx " len " TARGET_FMT_plx
- "\n", sdr, mask + 0x80);
- for (curaddr = sdr; curaddr < (sdr + mask + 0x80);
- curaddr += 16) {
- a0 = ldl_phys(curaddr);
- a1 = ldl_phys(curaddr + 4);
- a2 = ldl_phys(curaddr + 8);
- a3 = ldl_phys(curaddr + 12);
- if (a0 != 0 || a1 != 0 || a2 != 0 || a3 != 0) {
- qemu_log(TARGET_FMT_plx ": %08x %08x %08x %08x\n",
- curaddr, a0, a1, a2, a3);
+ ptem = (vsid << 7) | (pgidx >> 10);
+
+ /* Page address translation */
+ qemu_log_mask(CPU_LOG_MMU, "htab_base " TARGET_FMT_plx
+ " htab_mask " TARGET_FMT_plx
+ " hash " TARGET_FMT_plx "\n",
+ env->htab_base, env->htab_mask, hash);
+
+ /* Primary PTEG lookup */
+ qemu_log_mask(CPU_LOG_MMU, "0 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
+ " vsid=%" PRIx32 " ptem=%" PRIx32
+ " hash=" TARGET_FMT_plx "\n",
+ env->htab_base, env->htab_mask, vsid, ptem, hash);
+ pteg_off = get_pteg_offset32(env, hash);
+ pte_offset = ppc_hash32_pteg_search(env, pteg_off, 0, ptem, pte);
+ if (pte_offset == -1) {
+ /* Secondary PTEG lookup */
+ qemu_log_mask(CPU_LOG_MMU, "1 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
+ " vsid=%" PRIx32 " api=%" PRIx32
+ " hash=" TARGET_FMT_plx "\n", env->htab_base,
+ env->htab_mask, vsid, ptem, ~hash);
+ pteg_off = get_pteg_offset32(env, ~hash);
+ pte_offset = ppc_hash32_pteg_search(env, pteg_off, 1, ptem, pte);
+ }
+
+ return pte_offset;
+}
+
+static hwaddr ppc_hash32_pte_raddr(target_ulong sr, ppc_hash_pte32_t pte,
+ target_ulong eaddr)
+{
+ hwaddr rpn = pte.pte1 & HPTE32_R_RPN;
+ hwaddr mask = ~TARGET_PAGE_MASK;
+
+ return (rpn & ~mask) | (eaddr & mask);
+}
+
+int ppc_hash32_handle_mmu_fault(PowerPCCPU *cpu, target_ulong eaddr, int rwx,
+ int mmu_idx)
+{
+ CPUState *cs = CPU(cpu);
+ CPUPPCState *env = &cpu->env;
+ target_ulong sr;
+ hwaddr pte_offset;
+ ppc_hash_pte32_t pte;
+ int prot;
+ uint32_t new_pte1;
+ const int need_prot[] = {PAGE_READ, PAGE_WRITE, PAGE_EXEC};
+ hwaddr raddr;
+
+ assert((rwx == 0) || (rwx == 1) || (rwx == 2));
+
+ /* 1. Handle real mode accesses */
+ if (((rwx == 2) && (msr_ir == 0)) || ((rwx != 2) && (msr_dr == 0))) {
+ /* Translation is off */
+ raddr = eaddr;
+ tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
+ PAGE_READ | PAGE_WRITE | PAGE_EXEC, mmu_idx,
+ TARGET_PAGE_SIZE);
+ return 0;
+ }
+
+ /* 2. Check Block Address Translation entries (BATs) */
+ if (env->nb_BATs != 0) {
+ raddr = ppc_hash32_bat_lookup(env, eaddr, rwx, &prot);
+ if (raddr != -1) {
+ if (need_prot[rwx] & ~prot) {
+ if (rwx == 2) {
+ cs->exception_index = POWERPC_EXCP_ISI;
+ env->error_code = 0x08000000;
+ } else {
+ cs->exception_index = POWERPC_EXCP_DSI;
+ env->error_code = 0;
+ env->spr[SPR_DAR] = eaddr;
+ if (rwx == 1) {
+ env->spr[SPR_DSISR] = 0x0a000000;
+ } else {
+ env->spr[SPR_DSISR] = 0x08000000;
}
}
+ return 1;
}
-#endif
- } else {
- LOG_MMU("No access allowed\n");
- ret = -3;
- }
- } else {
- target_ulong sr;
-
- LOG_MMU("direct store...\n");
- /* Direct-store segment : absolutely *BUGGY* for now */
- /* Direct-store implies a 32-bit MMU.
- * Check the Segment Register's bus unit ID (BUID).
- */
- sr = env->sr[eaddr >> 28];
- if ((sr & 0x1FF00000) >> 20 == 0x07f) {
- /* Memory-forced I/O controller interface access */
- /* If T=1 and BUID=x'07F', the 601 performs a memory access
- * to SR[28-31] LA[4-31], bypassing all protection mechanisms.
- */
- ctx->raddr = ((sr & 0xF) << 28) | (eaddr & 0x0FFFFFFF);
- ctx->prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
+ tlb_set_page(cs, eaddr & TARGET_PAGE_MASK,
+ raddr & TARGET_PAGE_MASK, prot, mmu_idx,
+ TARGET_PAGE_SIZE);
return 0;
}
+ }
- switch (type) {
- case ACCESS_INT:
- /* Integer load/store : only access allowed */
- break;
- case ACCESS_CODE:
- /* No code fetch is allowed in direct-store areas */
- return -4;
- case ACCESS_FLOAT:
- /* Floating point load/store */
- return -4;
- case ACCESS_RES:
- /* lwarx, ldarx or srwcx. */
- return -4;
- case ACCESS_CACHE:
- /* dcba, dcbt, dcbtst, dcbf, dcbi, dcbst, dcbz, or icbi */
- /* Should make the instruction do no-op.
- * As it already do no-op, it's quite easy :-)
- */
- ctx->raddr = eaddr;
+ /* 3. Look up the Segment Register */
+ sr = env->sr[eaddr >> 28];
+
+ /* 4. Handle direct store segments */
+ if (sr & SR32_T) {
+ if (ppc_hash32_direct_store(env, sr, eaddr, rwx,
+ &raddr, &prot) == 0) {
+ tlb_set_page(cs, eaddr & TARGET_PAGE_MASK,
+ raddr & TARGET_PAGE_MASK, prot, mmu_idx,
+ TARGET_PAGE_SIZE);
return 0;
- case ACCESS_EXT:
- /* eciwx or ecowx */
- return -4;
- default:
- qemu_log("ERROR: instruction should not need "
- "address translation\n");
- return -4;
- }
- if ((rw == 1 || ctx->key != 1) && (rw == 0 || ctx->key != 0)) {
- ctx->raddr = eaddr;
- ret = 2;
} else {
- ret = -2;
+ return 1;
}
}
- return ret;
-}
+ /* 5. Check for segment level no-execute violation */
+ if ((rwx == 2) && (sr & SR32_NX)) {
+ cs->exception_index = POWERPC_EXCP_ISI;
+ env->error_code = 0x10000000;
+ return 1;
+ }
+ /* 6. Locate the PTE in the hash table */
+ pte_offset = ppc_hash32_htab_lookup(env, sr, eaddr, &pte);
+ if (pte_offset == -1) {
+ if (rwx == 2) {
+ cs->exception_index = POWERPC_EXCP_ISI;
+ env->error_code = 0x40000000;
+ } else {
+ cs->exception_index = POWERPC_EXCP_DSI;
+ env->error_code = 0;
+ env->spr[SPR_DAR] = eaddr;
+ if (rwx == 1) {
+ env->spr[SPR_DSISR] = 0x42000000;
+ } else {
+ env->spr[SPR_DSISR] = 0x40000000;
+ }
+ }
-static int ppc_hash32_get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
- target_ulong eaddr, int rw,
- int access_type)
-{
- bool real_mode = (access_type == ACCESS_CODE && msr_ir == 0)
- || (access_type != ACCESS_CODE && msr_dr == 0);
+ return 1;
+ }
+ qemu_log_mask(CPU_LOG_MMU,
+ "found PTE at offset %08" HWADDR_PRIx "\n", pte_offset);
- if (real_mode) {
- ctx->raddr = eaddr;
- ctx->prot = PAGE_READ | PAGE_EXEC | PAGE_WRITE;
- return 0;
- } else {
- int ret = -1;
+ /* 7. Check access permissions */
- /* Try to find a BAT */
- if (env->nb_BATs != 0) {
- ret = get_bat(env, ctx, eaddr, rw, access_type);
- }
- if (ret < 0) {
- /* We didn't match any BAT entry or don't have BATs */
- ret = get_segment32(env, ctx, eaddr, rw, access_type);
+ prot = ppc_hash32_pte_prot(env, sr, pte);
+
+ if (need_prot[rwx] & ~prot) {
+ /* Access right violation */
+ qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n");
+ if (rwx == 2) {
+ cs->exception_index = POWERPC_EXCP_ISI;
+ env->error_code = 0x08000000;
+ } else {
+ cs->exception_index = POWERPC_EXCP_DSI;
+ env->error_code = 0;
+ env->spr[SPR_DAR] = eaddr;
+ if (rwx == 1) {
+ env->spr[SPR_DSISR] = 0x0a000000;
+ } else {
+ env->spr[SPR_DSISR] = 0x08000000;
+ }
}
- return ret;
+ return 1;
}
-}
-hwaddr ppc_hash32_get_phys_page_debug(CPUPPCState *env, target_ulong addr)
-{
- mmu_ctx_t ctx;
+ qemu_log_mask(CPU_LOG_MMU, "PTE access granted !\n");
- if (unlikely(ppc_hash32_get_physical_address(env, &ctx, addr, 0, ACCESS_INT)
- != 0)) {
- return -1;
+ /* 8. Update PTE referenced and changed bits if necessary */
+
+ new_pte1 = pte.pte1 | HPTE32_R_R; /* set referenced bit */
+ if (rwx == 1) {
+ new_pte1 |= HPTE32_R_C; /* set changed (dirty) bit */
+ } else {
+ /* Treat the page as read-only for now, so that a later write
+ * will pass through this function again to set the C bit */
+ prot &= ~PAGE_WRITE;
+ }
+
+ if (new_pte1 != pte.pte1) {
+ ppc_hash32_store_hpte1(env, pte_offset, new_pte1);
}
- return ctx.raddr & TARGET_PAGE_MASK;
+ /* 9. Determine the real address from the PTE */
+
+ raddr = ppc_hash32_pte_raddr(sr, pte, eaddr);
+
+ tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
+ prot, mmu_idx, TARGET_PAGE_SIZE);
+
+ return 0;
}
-int ppc_hash32_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
- int mmu_idx)
+hwaddr ppc_hash32_get_phys_page_debug(CPUPPCState *env, target_ulong eaddr)
{
- mmu_ctx_t ctx;
- int access_type;
- int ret = 0;
-
- if (rw == 2) {
- /* code access */
- rw = 0;
- access_type = ACCESS_CODE;
- } else {
- /* data access */
- access_type = env->access_type;
+ target_ulong sr;
+ hwaddr pte_offset;
+ ppc_hash_pte32_t pte;
+ int prot;
+
+ if (msr_dr == 0) {
+ /* Translation is off */
+ return eaddr;
}
- ret = ppc_hash32_get_physical_address(env, &ctx, address, rw, access_type);
- if (ret == 0) {
- tlb_set_page(env, address & TARGET_PAGE_MASK,
- ctx.raddr & TARGET_PAGE_MASK, ctx.prot,
- mmu_idx, TARGET_PAGE_SIZE);
- ret = 0;
- } else if (ret < 0) {
- LOG_MMU_STATE(env);
- if (access_type == ACCESS_CODE) {
- switch (ret) {
- case -1:
- /* No matches in page tables or TLB */
- env->exception_index = POWERPC_EXCP_ISI;
- env->error_code = 0x40000000;
- break;
- case -2:
- /* Access rights violation */
- env->exception_index = POWERPC_EXCP_ISI;
- env->error_code = 0x08000000;
- break;
- case -3:
- /* No execute protection violation */
- env->exception_index = POWERPC_EXCP_ISI;
- env->error_code = 0x10000000;
- break;
- case -4:
- /* Direct store exception */
- /* No code fetch is allowed in direct-store areas */
- env->exception_index = POWERPC_EXCP_ISI;
- env->error_code = 0x10000000;
- break;
- }
- } else {
- switch (ret) {
- case -1:
- /* No matches in page tables or TLB */
- env->exception_index = POWERPC_EXCP_DSI;
- env->error_code = 0;
- env->spr[SPR_DAR] = address;
- if (rw == 1) {
- env->spr[SPR_DSISR] = 0x42000000;
- } else {
- env->spr[SPR_DSISR] = 0x40000000;
- }
- break;
- case -2:
- /* Access rights violation */
- env->exception_index = POWERPC_EXCP_DSI;
- env->error_code = 0;
- env->spr[SPR_DAR] = address;
- if (rw == 1) {
- env->spr[SPR_DSISR] = 0x0A000000;
- } else {
- env->spr[SPR_DSISR] = 0x08000000;
- }
- break;
- case -4:
- /* Direct store exception */
- switch (access_type) {
- case ACCESS_FLOAT:
- /* Floating point load/store */
- env->exception_index = POWERPC_EXCP_ALIGN;
- env->error_code = POWERPC_EXCP_ALIGN_FP;
- env->spr[SPR_DAR] = address;
- break;
- case ACCESS_RES:
- /* lwarx, ldarx or stwcx. */
- env->exception_index = POWERPC_EXCP_DSI;
- env->error_code = 0;
- env->spr[SPR_DAR] = address;
- if (rw == 1) {
- env->spr[SPR_DSISR] = 0x06000000;
- } else {
- env->spr[SPR_DSISR] = 0x04000000;
- }
- break;
- case ACCESS_EXT:
- /* eciwx or ecowx */
- env->exception_index = POWERPC_EXCP_DSI;
- env->error_code = 0;
- env->spr[SPR_DAR] = address;
- if (rw == 1) {
- env->spr[SPR_DSISR] = 0x06100000;
- } else {
- env->spr[SPR_DSISR] = 0x04100000;
- }
- break;
- default:
- printf("DSI: invalid exception (%d)\n", ret);
- env->exception_index = POWERPC_EXCP_PROGRAM;
- env->error_code =
- POWERPC_EXCP_INVAL | POWERPC_EXCP_INVAL_INVAL;
- env->spr[SPR_DAR] = address;
- break;
- }
- break;
- }
+
+ if (env->nb_BATs != 0) {
+ hwaddr raddr = ppc_hash32_bat_lookup(env, eaddr, 0, &prot);
+ if (raddr != -1) {
+ return raddr;
}
-#if 0
- printf("%s: set exception to %d %02x\n", __func__,
- env->exception, env->error_code);
-#endif
- ret = 1;
}
- return ret;
+ sr = env->sr[eaddr >> 28];
+
+ if (sr & SR32_T) {
+ /* FIXME: Add suitable debug support for Direct Store segments */
+ return -1;
+ }
+
+ pte_offset = ppc_hash32_htab_lookup(env, sr, eaddr, &pte);
+ if (pte_offset == -1) {
+ return -1;
+ }
+
+ return ppc_hash32_pte_raddr(sr, pte, eaddr) & TARGET_PAGE_MASK;
}
projects / qemu.git / blobdiff