| /* |
| * 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) { |
| return 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 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; |
| |
| /* 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 */ |
| epnshift = (slb->vsid & SLB_VSID_L) |
| ? TARGET_PAGE_BITS_16M : TARGET_PAGE_BITS; |
| 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 rpn = pte.pte1 & HPTE64_R_RPN; |
| /* FIXME: Add support for SLLP extended page sizes */ |
| int target_page_bits = (slb->vsid & SLB_VSID_L) |
| ? TARGET_PAGE_BITS_16M : TARGET_PAGE_BITS; |
| hwaddr 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) { |
| return kvmppc_hash64_write_pte(env, pte_index, pte0, pte1); |
| } |
| |
| 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); |
| } |
| } |
