--- /dev/null
+/*
+ * PowerPC MMU, TLB, SLB and BAT emulation helpers for QEMU.
+ *
+ * Copyright (c) 2003-2007 Jocelyn Mayer
+ * Copyright (c) 2013 David Gibson, IBM Corporation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "cpu.h"
+#include "exec/helper-proto.h"
+#include "sysemu/kvm.h"
+#include "kvm_ppc.h"
+#include "mmu-hash64.h"
+
+//#define DEBUG_MMU
+//#define DEBUG_SLB
+
+#ifdef DEBUG_MMU
+# define LOG_MMU_STATE(cpu) log_cpu_state((cpu), 0)
+#else
+# define LOG_MMU_STATE(cpu) do { } while (0)
+#endif
+
+#ifdef DEBUG_SLB
+# define LOG_SLB(...) qemu_log(__VA_ARGS__)
+#else
+# define LOG_SLB(...) do { } while (0)
+#endif
+
+/*
+ * Used to indicate whether we have allocated htab in the
+ * host kernel
+ */
+bool kvmppc_kern_htab;
+/*
+ * SLB handling
+ */
+
+static ppc_slb_t *slb_lookup(CPUPPCState *env, target_ulong eaddr)
+{
+ uint64_t esid_256M, esid_1T;
+ int n;
+
+ LOG_SLB("%s: eaddr " TARGET_FMT_lx "\n", __func__, eaddr);
+
+ esid_256M = (eaddr & SEGMENT_MASK_256M) | SLB_ESID_V;
+ esid_1T = (eaddr & SEGMENT_MASK_1T) | SLB_ESID_V;
+
+ for (n = 0; n < env->slb_nr; n++) {
+ ppc_slb_t *slb = &env->slb[n];
+
+ LOG_SLB("%s: slot %d %016" PRIx64 " %016"
+ PRIx64 "\n", __func__, n, slb->esid, slb->vsid);
+ /* We check for 1T matches on all MMUs here - if the MMU
+ * doesn't have 1T segment support, we will have prevented 1T
+ * entries from being inserted in the slbmte code. */
+ if (((slb->esid == esid_256M) &&
+ ((slb->vsid & SLB_VSID_B) == SLB_VSID_B_256M))
+ || ((slb->esid == esid_1T) &&
+ ((slb->vsid & SLB_VSID_B) == SLB_VSID_B_1T))) {
+ return slb;
+ }
+ }
+
+ return NULL;
+}
+
+void dump_slb(FILE *f, fprintf_function cpu_fprintf, CPUPPCState *env)
+{
+ int i;
+ uint64_t slbe, slbv;
+
+ cpu_synchronize_state(CPU(ppc_env_get_cpu(env)));
+
+ cpu_fprintf(f, "SLB\tESID\t\t\tVSID\n");
+ for (i = 0; i < env->slb_nr; i++) {
+ slbe = env->slb[i].esid;
+ slbv = env->slb[i].vsid;
+ if (slbe == 0 && slbv == 0) {
+ continue;
+ }
+ cpu_fprintf(f, "%d\t0x%016" PRIx64 "\t0x%016" PRIx64 "\n",
+ i, slbe, slbv);
+ }
+}
+
+void helper_slbia(CPUPPCState *env)
+{
+ PowerPCCPU *cpu = ppc_env_get_cpu(env);
+ int n, do_invalidate;
+
+ do_invalidate = 0;
+ /* XXX: Warning: slbia never invalidates the first segment */
+ for (n = 1; n < env->slb_nr; n++) {
+ ppc_slb_t *slb = &env->slb[n];
+
+ if (slb->esid & SLB_ESID_V) {
+ slb->esid &= ~SLB_ESID_V;
+ /* XXX: given the fact that segment size is 256 MB or 1TB,
+ * and we still don't have a tlb_flush_mask(env, n, mask)
+ * in QEMU, we just invalidate all TLBs
+ */
+ do_invalidate = 1;
+ }
+ }
+ if (do_invalidate) {
+ tlb_flush(CPU(cpu), 1);
+ }
+}
+
+void helper_slbie(CPUPPCState *env, target_ulong addr)
+{
+ PowerPCCPU *cpu = ppc_env_get_cpu(env);
+ ppc_slb_t *slb;
+
+ slb = slb_lookup(env, addr);
+ if (!slb) {
+ return;
+ }
+
+ if (slb->esid & SLB_ESID_V) {
+ slb->esid &= ~SLB_ESID_V;
+
+ /* XXX: given the fact that segment size is 256 MB or 1TB,
+ * and we still don't have a tlb_flush_mask(env, n, mask)
+ * in QEMU, we just invalidate all TLBs
+ */
+ tlb_flush(CPU(cpu), 1);
+ }
+}
+
+int ppc_store_slb(CPUPPCState *env, target_ulong rb, target_ulong rs)
+{
+ int slot = rb & 0xfff;
+ ppc_slb_t *slb = &env->slb[slot];
+
+ if (rb & (0x1000 - env->slb_nr)) {
+ return -1; /* Reserved bits set or slot too high */
+ }
+ if (rs & (SLB_VSID_B & ~SLB_VSID_B_1T)) {
+ return -1; /* Bad segment size */
+ }
+ if ((rs & SLB_VSID_B) && !(env->mmu_model & POWERPC_MMU_1TSEG)) {
+ return -1; /* 1T segment on MMU that doesn't support it */
+ }
+
+ /* Mask out the slot number as we store the entry */
+ slb->esid = rb & (SLB_ESID_ESID | SLB_ESID_V);
+ slb->vsid = rs;
+
+ LOG_SLB("%s: %d " TARGET_FMT_lx " - " TARGET_FMT_lx " => %016" PRIx64
+ " %016" PRIx64 "\n", __func__, slot, rb, rs,
+ slb->esid, slb->vsid);
+
+ return 0;
+}
+
+static int ppc_load_slb_esid(CPUPPCState *env, target_ulong rb,
+ target_ulong *rt)
+{
+ int slot = rb & 0xfff;
+ ppc_slb_t *slb = &env->slb[slot];
+
+ if (slot >= env->slb_nr) {
+ return -1;
+ }
+
+ *rt = slb->esid;
+ return 0;
+}
+
+static int ppc_load_slb_vsid(CPUPPCState *env, target_ulong rb,
+ target_ulong *rt)
+{
+ int slot = rb & 0xfff;
+ ppc_slb_t *slb = &env->slb[slot];
+
+ if (slot >= env->slb_nr) {
+ return -1;
+ }
+
+ *rt = slb->vsid;
+ return 0;
+}
+
+void helper_store_slb(CPUPPCState *env, target_ulong rb, target_ulong rs)
+{
+ if (ppc_store_slb(env, rb, rs) < 0) {
+ helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
+ POWERPC_EXCP_INVAL);
+ }
+}
+
+target_ulong helper_load_slb_esid(CPUPPCState *env, target_ulong rb)
+{
+ target_ulong rt = 0;
+
+ if (ppc_load_slb_esid(env, rb, &rt) < 0) {
+ helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
+ POWERPC_EXCP_INVAL);
+ }
+ return rt;
+}
+
+target_ulong helper_load_slb_vsid(CPUPPCState *env, target_ulong rb)
+{
+ target_ulong rt = 0;
+
+ if (ppc_load_slb_vsid(env, rb, &rt) < 0) {
+ helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
+ POWERPC_EXCP_INVAL);
+ }
+ return rt;
+}
+
+/*
+ * 64-bit hash table MMU handling
+ */
+
+static int ppc_hash64_pte_prot(CPUPPCState *env,
+ ppc_slb_t *slb, ppc_hash_pte64_t pte)
+{
+ unsigned pp, key;
+ /* Some pp bit combinations have undefined behaviour, so default
+ * to no access in those cases */
+ int prot = 0;
+
+ key = !!(msr_pr ? (slb->vsid & SLB_VSID_KP)
+ : (slb->vsid & SLB_VSID_KS));
+ pp = (pte.pte1 & HPTE64_R_PP) | ((pte.pte1 & HPTE64_R_PP0) >> 61);
+
+ if (key == 0) {
+ switch (pp) {
+ case 0x0:
+ case 0x1:
+ case 0x2:
+ prot = PAGE_READ | PAGE_WRITE;
+ break;
+
+ case 0x3:
+ case 0x6:
+ prot = PAGE_READ;
+ break;
+ }
+ } else {
+ switch (pp) {
+ case 0x0:
+ case 0x6:
+ prot = 0;
+ break;
+
+ case 0x1:
+ case 0x3:
+ prot = PAGE_READ;
+ break;
+
+ case 0x2:
+ prot = PAGE_READ | PAGE_WRITE;
+ break;
+ }
+ }
+
+ /* No execute if either noexec or guarded bits set */
+ if (!(pte.pte1 & HPTE64_R_N) || (pte.pte1 & HPTE64_R_G)
+ || (slb->vsid & SLB_VSID_N)) {
+ prot |= PAGE_EXEC;
+ }
+
+ return prot;
+}
+
+static int ppc_hash64_amr_prot(CPUPPCState *env, ppc_hash_pte64_t pte)
+{
+ int key, amrbits;
+ int prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
+
+
+ /* Only recent MMUs implement Virtual Page Class Key Protection */
+ if (!(env->mmu_model & POWERPC_MMU_AMR)) {
+ return prot;
+ }
+
+ key = HPTE64_R_KEY(pte.pte1);
+ amrbits = (env->spr[SPR_AMR] >> 2*(31 - key)) & 0x3;
+
+ /* fprintf(stderr, "AMR protection: key=%d AMR=0x%" PRIx64 "\n", key, */
+ /* env->spr[SPR_AMR]); */
+
+ /*
+ * A store is permitted if the AMR bit is 0. Remove write
+ * protection if it is set.
+ */
+ if (amrbits & 0x2) {
+ prot &= ~PAGE_WRITE;
+ }
+ /*
+ * A load is permitted if the AMR bit is 0. Remove read
+ * protection if it is set.
+ */
+ if (amrbits & 0x1) {
+ prot &= ~PAGE_READ;
+ }
+
+ return prot;
+}
+
+uint64_t ppc_hash64_start_access(PowerPCCPU *cpu, target_ulong pte_index)
+{
+ uint64_t token = 0;
+ hwaddr pte_offset;
+
+ pte_offset = pte_index * HASH_PTE_SIZE_64;
+ if (kvmppc_kern_htab) {
+ /*
+ * HTAB is controlled by KVM. Fetch the PTEG into a new buffer.
+ */
+ token = kvmppc_hash64_read_pteg(cpu, pte_index);
+ if (token) {
+ return token;
+ }
+ /*
+ * pteg read failed, even though we have allocated htab via
+ * kvmppc_reset_htab.
+ */
+ return 0;
+ }
+ /*
+ * HTAB is controlled by QEMU. Just point to the internally
+ * accessible PTEG.
+ */
+ if (cpu->env.external_htab) {
+ token = (uint64_t)(uintptr_t) cpu->env.external_htab + pte_offset;
+ } else if (cpu->env.htab_base) {
+ token = cpu->env.htab_base + pte_offset;
+ }
+ return token;
+}
+
+void ppc_hash64_stop_access(uint64_t token)
+{
+ if (kvmppc_kern_htab) {
+ kvmppc_hash64_free_pteg(token);
+ }
+}
+
+static hwaddr ppc_hash64_pteg_search(CPUPPCState *env, hwaddr hash,
+ bool secondary, target_ulong ptem,
+ ppc_hash_pte64_t *pte)
+{
+ int i;
+ uint64_t token;
+ target_ulong pte0, pte1;
+ target_ulong pte_index;
+
+ pte_index = (hash & env->htab_mask) * HPTES_PER_GROUP;
+ token = ppc_hash64_start_access(ppc_env_get_cpu(env), pte_index);
+ if (!token) {
+ return -1;
+ }
+ for (i = 0; i < HPTES_PER_GROUP; i++) {
+ pte0 = ppc_hash64_load_hpte0(env, token, i);
+ pte1 = ppc_hash64_load_hpte1(env, token, i);
+
+ if ((pte0 & HPTE64_V_VALID)
+ && (secondary == !!(pte0 & HPTE64_V_SECONDARY))
+ && HPTE64_V_COMPARE(pte0, ptem)) {
+ pte->pte0 = pte0;
+ pte->pte1 = pte1;
+ ppc_hash64_stop_access(token);
+ return (pte_index + i) * HASH_PTE_SIZE_64;
+ }
+ }
+ ppc_hash64_stop_access(token);
+ /*
+ * We didn't find a valid entry.
+ */
+ return -1;
+}
+
+static uint64_t ppc_hash64_page_shift(ppc_slb_t *slb)
+{
+ uint64_t epnshift;
+
+ /* Page size according to the SLB, which we use to generate the
+ * EPN for hash table lookup.. When we implement more recent MMU
+ * extensions this might be different from the actual page size
+ * encoded in the PTE */
+ if ((slb->vsid & SLB_VSID_LLP_MASK) == SLB_VSID_4K) {
+ epnshift = TARGET_PAGE_BITS;
+ } else if ((slb->vsid & SLB_VSID_LLP_MASK) == SLB_VSID_64K) {
+ epnshift = TARGET_PAGE_BITS_64K;
+ } else {
+ epnshift = TARGET_PAGE_BITS_16M;
+ }
+ return epnshift;
+}
+
+static hwaddr ppc_hash64_htab_lookup(CPUPPCState *env,
+ ppc_slb_t *slb, target_ulong eaddr,
+ ppc_hash_pte64_t *pte)
+{
+ hwaddr pte_offset;
+ hwaddr hash;
+ uint64_t vsid, epnshift, epnmask, epn, ptem;
+
+ epnshift = ppc_hash64_page_shift(slb);
+ epnmask = ~((1ULL << epnshift) - 1);
+
+ if (slb->vsid & SLB_VSID_B) {
+ /* 1TB segment */
+ vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT_1T;
+ epn = (eaddr & ~SEGMENT_MASK_1T) & epnmask;
+ hash = vsid ^ (vsid << 25) ^ (epn >> epnshift);
+ } else {
+ /* 256M segment */
+ vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT;
+ epn = (eaddr & ~SEGMENT_MASK_256M) & epnmask;
+ hash = vsid ^ (epn >> epnshift);
+ }
+ ptem = (slb->vsid & SLB_VSID_PTEM) | ((epn >> 16) & HPTE64_V_AVPN);
+
+ /* 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=" TARGET_FMT_lx " ptem=" TARGET_FMT_lx
+ " hash=" TARGET_FMT_plx "\n",
+ env->htab_base, env->htab_mask, vsid, ptem, hash);
+ pte_offset = ppc_hash64_pteg_search(env, hash, 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=" TARGET_FMT_lx " api=" TARGET_FMT_lx
+ " hash=" TARGET_FMT_plx "\n", env->htab_base,
+ env->htab_mask, vsid, ptem, ~hash);
+
+ pte_offset = ppc_hash64_pteg_search(env, ~hash, 1, ptem, pte);
+ }
+
+ return pte_offset;
+}
+
+static hwaddr ppc_hash64_pte_raddr(ppc_slb_t *slb, ppc_hash_pte64_t pte,
+ target_ulong eaddr)
+{
+ hwaddr mask;
+ int target_page_bits;
+ hwaddr rpn = pte.pte1 & HPTE64_R_RPN;
+ /*
+ * We support 4K, 64K and 16M now
+ */
+ target_page_bits = ppc_hash64_page_shift(slb);
+ mask = (1ULL << target_page_bits) - 1;
+ return (rpn & ~mask) | (eaddr & mask);
+}
+
+int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, target_ulong eaddr,
+ int rwx, int mmu_idx)
+{
+ CPUState *cs = CPU(cpu);
+ CPUPPCState *env = &cpu->env;
+ ppc_slb_t *slb;
+ hwaddr pte_offset;
+ ppc_hash_pte64_t pte;
+ int pp_prot, amr_prot, prot;
+ uint64_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 */
+ /* In real mode the top 4 effective address bits are ignored */
+ raddr = eaddr & 0x0FFFFFFFFFFFFFFFULL;
+ 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. Translation is on, so look up the SLB */
+ slb = slb_lookup(env, eaddr);
+
+ if (!slb) {
+ if (rwx == 2) {
+ cs->exception_index = POWERPC_EXCP_ISEG;
+ env->error_code = 0;
+ } else {
+ cs->exception_index = POWERPC_EXCP_DSEG;
+ env->error_code = 0;
+ env->spr[SPR_DAR] = eaddr;
+ }
+ return 1;
+ }
+
+ /* 3. Check for segment level no-execute violation */
+ if ((rwx == 2) && (slb->vsid & SLB_VSID_N)) {
+ cs->exception_index = POWERPC_EXCP_ISI;
+ env->error_code = 0x10000000;
+ return 1;
+ }
+
+ /* 4. Locate the PTE in the hash table */
+ pte_offset = ppc_hash64_htab_lookup(env, slb, 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;
+ }
+ }
+ return 1;
+ }
+ qemu_log_mask(CPU_LOG_MMU,
+ "found PTE at offset %08" HWADDR_PRIx "\n", pte_offset);
+
+ /* 5. Check access permissions */
+
+ pp_prot = ppc_hash64_pte_prot(env, slb, pte);
+ amr_prot = ppc_hash64_amr_prot(env, pte);
+ prot = pp_prot & amr_prot;
+
+ if ((need_prot[rwx] & ~prot) != 0) {
+ /* 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 {
+ target_ulong dsisr = 0;
+
+ cs->exception_index = POWERPC_EXCP_DSI;
+ env->error_code = 0;
+ env->spr[SPR_DAR] = eaddr;
+ if (need_prot[rwx] & ~pp_prot) {
+ dsisr |= 0x08000000;
+ }
+ if (rwx == 1) {
+ dsisr |= 0x02000000;
+ }
+ if (need_prot[rwx] & ~amr_prot) {
+ dsisr |= 0x00200000;
+ }
+ env->spr[SPR_DSISR] = dsisr;
+ }
+ return 1;
+ }
+
+ qemu_log_mask(CPU_LOG_MMU, "PTE access granted !\n");
+
+ /* 6. Update PTE referenced and changed bits if necessary */
+
+ new_pte1 = pte.pte1 | HPTE64_R_R; /* set referenced bit */
+ if (rwx == 1) {
+ new_pte1 |= HPTE64_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_hash64_store_hpte(env, pte_offset / HASH_PTE_SIZE_64,
+ pte.pte0, new_pte1);
+ }
+
+ /* 7. Determine the real address from the PTE */
+
+ raddr = ppc_hash64_pte_raddr(slb, pte, eaddr);
+
+ tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
+ prot, mmu_idx, TARGET_PAGE_SIZE);
+
+ return 0;
+}
+
+hwaddr ppc_hash64_get_phys_page_debug(CPUPPCState *env, target_ulong addr)
+{
+ ppc_slb_t *slb;
+ hwaddr pte_offset;
+ ppc_hash_pte64_t pte;
+
+ if (msr_dr == 0) {
+ /* In real mode the top 4 effective address bits are ignored */
+ return addr & 0x0FFFFFFFFFFFFFFFULL;
+ }
+
+ slb = slb_lookup(env, addr);
+ if (!slb) {
+ return -1;
+ }
+
+ pte_offset = ppc_hash64_htab_lookup(env, slb, addr, &pte);
+ if (pte_offset == -1) {
+ return -1;
+ }
+
+ return ppc_hash64_pte_raddr(slb, pte, addr) & TARGET_PAGE_MASK;
+}
+
+void ppc_hash64_store_hpte(CPUPPCState *env,
+ target_ulong pte_index,
+ target_ulong pte0, target_ulong pte1)
+{
+ CPUState *cs = CPU(ppc_env_get_cpu(env));
+
+ if (kvmppc_kern_htab) {
+ kvmppc_hash64_write_pte(env, pte_index, pte0, pte1);
+ return;
+ }
+
+ pte_index *= HASH_PTE_SIZE_64;
+ if (env->external_htab) {
+ stq_p(env->external_htab + pte_index, pte0);
+ stq_p(env->external_htab + pte_index + HASH_PTE_SIZE_64/2, pte1);
+ } else {
+ stq_phys(cs->as, env->htab_base + pte_index, pte0);
+ stq_phys(cs->as, env->htab_base + pte_index + HASH_PTE_SIZE_64/2, pte1);
+ }
+}
Code Review / kvmfornfv.git / blobdiff