diff options
Diffstat (limited to 'target-ppc/mmu-hash64.c')
| -rw-r--r-- | target-ppc/mmu-hash64.c | 647 |
1 files changed, 647 insertions, 0 deletions
diff --git a/target-ppc/mmu-hash64.c b/target-ppc/mmu-hash64.c new file mode 100644 index 00000000..7df6edeb --- /dev/null +++ b/target-ppc/mmu-hash64.c @@ -0,0 +1,647 @@ +/* + * 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); + } +} |