| /* |
| * PowerPC MMU, TLB 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 "helper.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) |
| #else |
| # define LOG_MMU(...) do { } while (0) |
| # define LOG_MMU_STATE(...) do { } while (0) |
| #endif |
| |
| #ifdef DEBUG_BATS |
| # define LOG_BATS(...) qemu_log(__VA_ARGS__) |
| #else |
| # define LOG_BATS(...) do { } while (0) |
| #endif |
| |
| struct mmu_ctx_hash32 { |
| hwaddr raddr; /* Real address */ |
| int prot; /* Protection bits */ |
| int key; /* Access key */ |
| }; |
| |
| static int ppc_hash32_pp_prot(int key, int pp, int nx) |
| { |
| int prot; |
| |
| if (key == 0) { |
| switch (pp) { |
| case 0x0: |
| case 0x1: |
| case 0x2: |
| prot = PAGE_READ | PAGE_WRITE; |
| break; |
| |
| case 0x3: |
| prot = PAGE_READ; |
| break; |
| |
| default: |
| abort(); |
| } |
| } else { |
| switch (pp) { |
| case 0x0: |
| prot = 0; |
| break; |
| |
| case 0x1: |
| case 0x3: |
| prot = PAGE_READ; |
| break; |
| |
| case 0x2: |
| prot = PAGE_READ | PAGE_WRITE; |
| break; |
| |
| default: |
| abort(); |
| } |
| } |
| if (nx == 0) { |
| prot |= PAGE_EXEC; |
| } |
| |
| return prot; |
| } |
| |
| static int ppc_hash32_pte_prot(CPUPPCState *env, |
| target_ulong sr, ppc_hash_pte32_t pte) |
| { |
| unsigned pp, key; |
| |
| 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 BATU32_BEPI & ~((batl & BATL32_601_BL) << 17); |
| } |
| |
| static int hash32_bat_601_prot(CPUPPCState *env, |
| target_ulong batu, target_ulong batl) |
| { |
| 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 hwaddr ppc_hash32_bat_lookup(CPUPPCState *env, target_ulong ea, int rwx, |
| int *prot) |
| { |
| 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 { |
| *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 -1; |
| } |
| |
| static int ppc_hash32_direct_store(CPUPPCState *env, target_ulong sr, |
| target_ulong eaddr, int rwx, |
| hwaddr *raddr, int *prot) |
| { |
| int key = !!(msr_pr ? (sr & SR32_KP) : (sr & SR32_KS)); |
| |
| 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; |
| } |
| |
| if (rwx == 2) { |
| /* No code fetch is allowed in direct-store areas */ |
| env->exception_index = POWERPC_EXCP_ISI; |
| env->error_code = 0x10000000; |
| return 1; |
| } |
| |
| switch (env->access_type) { |
| case ACCESS_INT: |
| /* Integer load/store : only access allowed */ |
| break; |
| case ACCESS_FLOAT: |
| /* Floating point load/store */ |
| env->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 */ |
| env->exception_index = POWERPC_EXCP_DSI; |
| env->error_code = 0; |
| env->spr[SPR_DAR] = eaddr; |
| if (rwx == 1) { |
| env->spr[SPR_DSISR] = 0x06100000; |
| } else { |
| env->spr[SPR_DSISR] = 0x04100000; |
| } |
| return 1; |
| default: |
| qemu_log("ERROR: instruction should not need " |
| "address translation\n"); |
| abort(); |
| } |
| if ((rwx == 1 || key != 1) && (rwx == 0 || key != 0)) { |
| *raddr = eaddr; |
| return 0; |
| } else { |
| env->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; |
| } |
| } |
| |
| hwaddr get_pteg_offset32(CPUPPCState *env, hwaddr hash) |
| { |
| return (hash * HASH_PTEG_SIZE_32) & env->htab_mask; |
| } |
| |
| static hwaddr ppc_hash32_pteg_search(CPUPPCState *env, hwaddr pteg_off, |
| bool secondary, target_ulong ptem, |
| ppc_hash_pte32_t *pte) |
| { |
| hwaddr pte_offset = pteg_off; |
| target_ulong pte0, pte1; |
| 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; |
| } |
| |
| pte_offset += HASH_PTE_SIZE_32; |
| } |
| |
| return -1; |
| } |
| |
| 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; |
| uint32_t vsid, pgidx, ptem; |
| |
| vsid = sr & SR32_VSID; |
| pgidx = (eaddr & ~SEGMENT_MASK_256M) >> TARGET_PAGE_BITS; |
| hash = vsid ^ pgidx; |
| ptem = (vsid << 7) | (pgidx >> 10); |
| |
| /* 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); |
| |
| /* Primary PTEG lookup */ |
| 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 */ |
| 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(CPUPPCState *env, target_ulong eaddr, int rwx, |
| int mmu_idx) |
| { |
| 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(env, 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) { |
| env->exception_index = POWERPC_EXCP_ISI; |
| env->error_code = 0x08000000; |
| } else { |
| env->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; |
| } |
| |
| tlb_set_page(env, eaddr & TARGET_PAGE_MASK, |
| raddr & TARGET_PAGE_MASK, prot, mmu_idx, |
| TARGET_PAGE_SIZE); |
| return 0; |
| } |
| } |
| |
| /* 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(env, eaddr & TARGET_PAGE_MASK, |
| raddr & TARGET_PAGE_MASK, prot, mmu_idx, |
| TARGET_PAGE_SIZE); |
| return 0; |
| } else { |
| return 1; |
| } |
| } |
| |
| /* 5. Check for segment level no-execute violation */ |
| if ((rwx == 2) && (sr & SR32_NX)) { |
| env->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) { |
| env->exception_index = POWERPC_EXCP_ISI; |
| env->error_code = 0x40000000; |
| } else { |
| env->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; |
| } |
| LOG_MMU("found PTE at offset %08" HWADDR_PRIx "\n", pte_offset); |
| |
| /* 7. Check access permissions */ |
| |
| prot = ppc_hash32_pte_prot(env, sr, pte); |
| |
| if (need_prot[rwx] & ~prot) { |
| /* Access right violation */ |
| LOG_MMU("PTE access rejected\n"); |
| if (rwx == 2) { |
| env->exception_index = POWERPC_EXCP_ISI; |
| env->error_code = 0x08000000; |
| } else { |
| env->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; |
| } |
| |
| LOG_MMU("PTE access granted !\n"); |
| |
| /* 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); |
| } |
| |
| /* 9. Determine the real address from the PTE */ |
| |
| raddr = ppc_hash32_pte_raddr(sr, pte, eaddr); |
| |
| tlb_set_page(env, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK, |
| prot, mmu_idx, TARGET_PAGE_SIZE); |
| |
| return 0; |
| } |
| |
| hwaddr ppc_hash32_get_phys_page_debug(CPUPPCState *env, target_ulong eaddr) |
| { |
| target_ulong sr; |
| hwaddr pte_offset; |
| ppc_hash_pte32_t pte; |
| int prot; |
| |
| if (msr_dr == 0) { |
| /* Translation is off */ |
| return eaddr; |
| } |
| |
| if (env->nb_BATs != 0) { |
| hwaddr raddr = ppc_hash32_bat_lookup(env, eaddr, 0, &prot); |
| if (raddr != -1) { |
| return raddr; |
| } |
| } |
| |
| 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; |
| } |
