| /* |
| * HPPA memory access helper routines |
| * |
| * Copyright (c) 2017 Helge Deller |
| * |
| * 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 2.1 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 "qemu/osdep.h" |
| #include "qemu/log.h" |
| #include "cpu.h" |
| #include "exec/exec-all.h" |
| #include "exec/helper-proto.h" |
| #include "hw/core/cpu.h" |
| #include "trace.h" |
| |
| static hppa_tlb_entry *hppa_find_tlb(CPUHPPAState *env, vaddr addr) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(env->tlb); ++i) { |
| hppa_tlb_entry *ent = &env->tlb[i]; |
| if (ent->va_b <= addr && addr <= ent->va_e) { |
| trace_hppa_tlb_find_entry(env, ent + i, ent->entry_valid, |
| ent->va_b, ent->va_e, ent->pa); |
| return ent; |
| } |
| } |
| trace_hppa_tlb_find_entry_not_found(env, addr); |
| return NULL; |
| } |
| |
| static void hppa_flush_tlb_ent(CPUHPPAState *env, hppa_tlb_entry *ent, |
| bool force_flush_btlb) |
| { |
| CPUState *cs = env_cpu(env); |
| |
| if (!ent->entry_valid) { |
| return; |
| } |
| |
| trace_hppa_tlb_flush_ent(env, ent, ent->va_b, ent->va_e, ent->pa); |
| |
| tlb_flush_range_by_mmuidx(cs, ent->va_b, |
| ent->va_e - ent->va_b + 1, |
| HPPA_MMU_FLUSH_MASK, TARGET_LONG_BITS); |
| |
| /* never clear BTLBs, unless forced to do so. */ |
| if (ent < &env->tlb[HPPA_BTLB_ENTRIES] && !force_flush_btlb) { |
| return; |
| } |
| |
| memset(ent, 0, sizeof(*ent)); |
| ent->va_b = -1; |
| } |
| |
| static hppa_tlb_entry *hppa_alloc_tlb_ent(CPUHPPAState *env) |
| { |
| hppa_tlb_entry *ent; |
| uint32_t i; |
| |
| if (env->tlb_last < HPPA_BTLB_ENTRIES || env->tlb_last >= ARRAY_SIZE(env->tlb)) { |
| i = HPPA_BTLB_ENTRIES; |
| env->tlb_last = HPPA_BTLB_ENTRIES + 1; |
| } else { |
| i = env->tlb_last; |
| env->tlb_last++; |
| } |
| |
| ent = &env->tlb[i]; |
| |
| hppa_flush_tlb_ent(env, ent, false); |
| return ent; |
| } |
| |
| int hppa_get_physical_address(CPUHPPAState *env, vaddr addr, int mmu_idx, |
| int type, hwaddr *pphys, int *pprot, |
| hppa_tlb_entry **tlb_entry) |
| { |
| hwaddr phys; |
| int prot, r_prot, w_prot, x_prot, priv; |
| hppa_tlb_entry *ent; |
| int ret = -1; |
| |
| if (tlb_entry) { |
| *tlb_entry = NULL; |
| } |
| |
| /* Virtual translation disabled. Direct map virtual to physical. */ |
| if (mmu_idx == MMU_PHYS_IDX) { |
| phys = addr; |
| prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; |
| goto egress; |
| } |
| |
| /* Find a valid tlb entry that matches the virtual address. */ |
| ent = hppa_find_tlb(env, addr); |
| if (ent == NULL || !ent->entry_valid) { |
| phys = 0; |
| prot = 0; |
| ret = (type == PAGE_EXEC) ? EXCP_ITLB_MISS : EXCP_DTLB_MISS; |
| goto egress; |
| } |
| |
| if (tlb_entry) { |
| *tlb_entry = ent; |
| } |
| |
| /* We now know the physical address. */ |
| phys = ent->pa + (addr - ent->va_b); |
| |
| /* Map TLB access_rights field to QEMU protection. */ |
| priv = MMU_IDX_TO_PRIV(mmu_idx); |
| r_prot = (priv <= ent->ar_pl1) * PAGE_READ; |
| w_prot = (priv <= ent->ar_pl2) * PAGE_WRITE; |
| x_prot = (ent->ar_pl2 <= priv && priv <= ent->ar_pl1) * PAGE_EXEC; |
| switch (ent->ar_type) { |
| case 0: /* read-only: data page */ |
| prot = r_prot; |
| break; |
| case 1: /* read/write: dynamic data page */ |
| prot = r_prot | w_prot; |
| break; |
| case 2: /* read/execute: normal code page */ |
| prot = r_prot | x_prot; |
| break; |
| case 3: /* read/write/execute: dynamic code page */ |
| prot = r_prot | w_prot | x_prot; |
| break; |
| default: /* execute: promote to privilege level type & 3 */ |
| prot = x_prot; |
| break; |
| } |
| |
| /* access_id == 0 means public page and no check is performed */ |
| if ((env->psw & PSW_P) && ent->access_id) { |
| /* If bits [31:1] match, and bit 0 is set, suppress write. */ |
| int match = ent->access_id * 2 + 1; |
| |
| if (match == env->cr[CR_PID1] || match == env->cr[CR_PID2] || |
| match == env->cr[CR_PID3] || match == env->cr[CR_PID4]) { |
| prot &= PAGE_READ | PAGE_EXEC; |
| if (type == PAGE_WRITE) { |
| ret = EXCP_DMPI; |
| goto egress; |
| } |
| } |
| } |
| |
| /* No guest access type indicates a non-architectural access from |
| within QEMU. Bypass checks for access, D, B and T bits. */ |
| if (type == 0) { |
| goto egress; |
| } |
| |
| if (unlikely(!(prot & type))) { |
| /* The access isn't allowed -- Inst/Data Memory Protection Fault. */ |
| ret = (type & PAGE_EXEC) ? EXCP_IMP : EXCP_DMAR; |
| goto egress; |
| } |
| |
| /* In reverse priority order, check for conditions which raise faults. |
| As we go, remove PROT bits that cover the condition we want to check. |
| In this way, the resulting PROT will force a re-check of the |
| architectural TLB entry for the next access. */ |
| if (unlikely(!ent->d)) { |
| if (type & PAGE_WRITE) { |
| /* The D bit is not set -- TLB Dirty Bit Fault. */ |
| ret = EXCP_TLB_DIRTY; |
| } |
| prot &= PAGE_READ | PAGE_EXEC; |
| } |
| if (unlikely(ent->b)) { |
| if (type & PAGE_WRITE) { |
| /* The B bit is set -- Data Memory Break Fault. */ |
| ret = EXCP_DMB; |
| } |
| prot &= PAGE_READ | PAGE_EXEC; |
| } |
| if (unlikely(ent->t)) { |
| if (!(type & PAGE_EXEC)) { |
| /* The T bit is set -- Page Reference Fault. */ |
| ret = EXCP_PAGE_REF; |
| } |
| prot &= PAGE_EXEC; |
| } |
| |
| egress: |
| *pphys = phys; |
| *pprot = prot; |
| trace_hppa_tlb_get_physical_address(env, ret, prot, addr, phys); |
| return ret; |
| } |
| |
| hwaddr hppa_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) |
| { |
| HPPACPU *cpu = HPPA_CPU(cs); |
| hwaddr phys; |
| int prot, excp; |
| |
| /* If the (data) mmu is disabled, bypass translation. */ |
| /* ??? We really ought to know if the code mmu is disabled too, |
| in order to get the correct debugging dumps. */ |
| if (!(cpu->env.psw & PSW_D)) { |
| return addr; |
| } |
| |
| excp = hppa_get_physical_address(&cpu->env, addr, MMU_KERNEL_IDX, 0, |
| &phys, &prot, NULL); |
| |
| /* Since we're translating for debugging, the only error that is a |
| hard error is no translation at all. Otherwise, while a real cpu |
| access might not have permission, the debugger does. */ |
| return excp == EXCP_DTLB_MISS ? -1 : phys; |
| } |
| |
| bool hppa_cpu_tlb_fill(CPUState *cs, vaddr addr, int size, |
| MMUAccessType type, int mmu_idx, |
| bool probe, uintptr_t retaddr) |
| { |
| HPPACPU *cpu = HPPA_CPU(cs); |
| CPUHPPAState *env = &cpu->env; |
| hppa_tlb_entry *ent; |
| int prot, excp, a_prot; |
| hwaddr phys; |
| |
| switch (type) { |
| case MMU_INST_FETCH: |
| a_prot = PAGE_EXEC; |
| break; |
| case MMU_DATA_STORE: |
| a_prot = PAGE_WRITE; |
| break; |
| default: |
| a_prot = PAGE_READ; |
| break; |
| } |
| |
| excp = hppa_get_physical_address(env, addr, mmu_idx, |
| a_prot, &phys, &prot, &ent); |
| if (unlikely(excp >= 0)) { |
| if (probe) { |
| return false; |
| } |
| trace_hppa_tlb_fill_excp(env, addr, size, type, mmu_idx); |
| /* Failure. Raise the indicated exception. */ |
| cs->exception_index = excp; |
| if (cpu->env.psw & PSW_Q) { |
| /* ??? Needs tweaking for hppa64. */ |
| cpu->env.cr[CR_IOR] = addr; |
| cpu->env.cr[CR_ISR] = addr >> 32; |
| } |
| cpu_loop_exit_restore(cs, retaddr); |
| } |
| |
| trace_hppa_tlb_fill_success(env, addr & TARGET_PAGE_MASK, |
| phys & TARGET_PAGE_MASK, size, type, mmu_idx); |
| /* Success! Store the translation into the QEMU TLB. */ |
| tlb_set_page(cs, addr & TARGET_PAGE_MASK, phys & TARGET_PAGE_MASK, |
| prot, mmu_idx, TARGET_PAGE_SIZE << (ent ? 2 * ent->page_size : 0)); |
| return true; |
| } |
| |
| /* Insert (Insn/Data) TLB Address. Note this is PA 1.1 only. */ |
| void HELPER(itlba)(CPUHPPAState *env, target_ulong addr, target_ureg reg) |
| { |
| hppa_tlb_entry *empty = NULL; |
| int i; |
| |
| /* Zap any old entries covering ADDR; notice empty entries on the way. */ |
| for (i = HPPA_BTLB_ENTRIES; i < ARRAY_SIZE(env->tlb); ++i) { |
| hppa_tlb_entry *ent = &env->tlb[i]; |
| if (ent->va_b <= addr && addr <= ent->va_e) { |
| if (ent->entry_valid) { |
| hppa_flush_tlb_ent(env, ent, false); |
| } |
| if (!empty) { |
| empty = ent; |
| } |
| } |
| } |
| |
| /* If we didn't see an empty entry, evict one. */ |
| if (empty == NULL) { |
| empty = hppa_alloc_tlb_ent(env); |
| } |
| |
| /* Note that empty->entry_valid == 0 already. */ |
| empty->va_b = addr & TARGET_PAGE_MASK; |
| empty->va_e = empty->va_b + TARGET_PAGE_SIZE - 1; |
| empty->pa = extract32(reg, 5, 20) << TARGET_PAGE_BITS; |
| trace_hppa_tlb_itlba(env, empty, empty->va_b, empty->va_e, empty->pa); |
| } |
| |
| static void set_access_bits(CPUHPPAState *env, hppa_tlb_entry *ent, target_ureg reg) |
| { |
| ent->access_id = extract32(reg, 1, 18); |
| ent->u = extract32(reg, 19, 1); |
| ent->ar_pl2 = extract32(reg, 20, 2); |
| ent->ar_pl1 = extract32(reg, 22, 2); |
| ent->ar_type = extract32(reg, 24, 3); |
| ent->b = extract32(reg, 27, 1); |
| ent->d = extract32(reg, 28, 1); |
| ent->t = extract32(reg, 29, 1); |
| ent->entry_valid = 1; |
| trace_hppa_tlb_itlbp(env, ent, ent->access_id, ent->u, ent->ar_pl2, |
| ent->ar_pl1, ent->ar_type, ent->b, ent->d, ent->t); |
| } |
| |
| /* Insert (Insn/Data) TLB Protection. Note this is PA 1.1 only. */ |
| void HELPER(itlbp)(CPUHPPAState *env, target_ulong addr, target_ureg reg) |
| { |
| hppa_tlb_entry *ent = hppa_find_tlb(env, addr); |
| |
| if (unlikely(ent == NULL)) { |
| qemu_log_mask(LOG_GUEST_ERROR, "ITLBP not following ITLBA\n"); |
| return; |
| } |
| |
| set_access_bits(env, ent, reg); |
| } |
| |
| /* Purge (Insn/Data) TLB. This is explicitly page-based, and is |
| synchronous across all processors. */ |
| static void ptlb_work(CPUState *cpu, run_on_cpu_data data) |
| { |
| CPUHPPAState *env = cpu_env(cpu); |
| target_ulong addr = (target_ulong) data.target_ptr; |
| hppa_tlb_entry *ent = hppa_find_tlb(env, addr); |
| |
| if (ent && ent->entry_valid) { |
| hppa_flush_tlb_ent(env, ent, false); |
| } |
| } |
| |
| void HELPER(ptlb)(CPUHPPAState *env, target_ulong addr) |
| { |
| CPUState *src = env_cpu(env); |
| CPUState *cpu; |
| trace_hppa_tlb_ptlb(env); |
| run_on_cpu_data data = RUN_ON_CPU_TARGET_PTR(addr); |
| |
| CPU_FOREACH(cpu) { |
| if (cpu != src) { |
| async_run_on_cpu(cpu, ptlb_work, data); |
| } |
| } |
| async_safe_run_on_cpu(src, ptlb_work, data); |
| } |
| |
| /* Purge (Insn/Data) TLB entry. This affects an implementation-defined |
| number of pages/entries (we choose all), and is local to the cpu. */ |
| void HELPER(ptlbe)(CPUHPPAState *env) |
| { |
| trace_hppa_tlb_ptlbe(env); |
| qemu_log_mask(CPU_LOG_MMU, "FLUSH ALL TLB ENTRIES\n"); |
| memset(&env->tlb[HPPA_BTLB_ENTRIES], 0, |
| sizeof(env->tlb) - HPPA_BTLB_ENTRIES * sizeof(env->tlb[0])); |
| env->tlb_last = HPPA_BTLB_ENTRIES; |
| tlb_flush_by_mmuidx(env_cpu(env), HPPA_MMU_FLUSH_MASK); |
| } |
| |
| void cpu_hppa_change_prot_id(CPUHPPAState *env) |
| { |
| if (env->psw & PSW_P) { |
| tlb_flush_by_mmuidx(env_cpu(env), HPPA_MMU_FLUSH_MASK); |
| } |
| } |
| |
| void HELPER(change_prot_id)(CPUHPPAState *env) |
| { |
| cpu_hppa_change_prot_id(env); |
| } |
| |
| target_ureg HELPER(lpa)(CPUHPPAState *env, target_ulong addr) |
| { |
| hwaddr phys; |
| int prot, excp; |
| |
| excp = hppa_get_physical_address(env, addr, MMU_KERNEL_IDX, 0, |
| &phys, &prot, NULL); |
| if (excp >= 0) { |
| if (env->psw & PSW_Q) { |
| /* ??? Needs tweaking for hppa64. */ |
| env->cr[CR_IOR] = addr; |
| env->cr[CR_ISR] = addr >> 32; |
| } |
| if (excp == EXCP_DTLB_MISS) { |
| excp = EXCP_NA_DTLB_MISS; |
| } |
| trace_hppa_tlb_lpa_failed(env, addr); |
| hppa_dynamic_excp(env, excp, GETPC()); |
| } |
| trace_hppa_tlb_lpa_success(env, addr, phys); |
| return phys; |
| } |
| |
| /* Return the ar_type of the TLB at VADDR, or -1. */ |
| int hppa_artype_for_page(CPUHPPAState *env, target_ulong vaddr) |
| { |
| hppa_tlb_entry *ent = hppa_find_tlb(env, vaddr); |
| return ent ? ent->ar_type : -1; |
| } |
| |
| /* |
| * diag_btlb() emulates the PDC PDC_BLOCK_TLB firmware call to |
| * allow operating systems to modify the Block TLB (BTLB) entries. |
| * For implementation details see page 1-13 in |
| * https://parisc.wiki.kernel.org/images-parisc/e/ef/Pdc11-v0.96-Ch1-procs.pdf |
| */ |
| void HELPER(diag_btlb)(CPUHPPAState *env) |
| { |
| unsigned int phys_page, len, slot; |
| int mmu_idx = cpu_mmu_index(env, 0); |
| uintptr_t ra = GETPC(); |
| hppa_tlb_entry *btlb; |
| uint64_t virt_page; |
| uint32_t *vaddr; |
| |
| #ifdef TARGET_HPPA64 |
| /* BTLBs are not supported on 64-bit CPUs */ |
| env->gr[28] = -1; /* nonexistent procedure */ |
| return; |
| #endif |
| env->gr[28] = 0; /* PDC_OK */ |
| |
| switch (env->gr[25]) { |
| case 0: |
| /* return BTLB parameters */ |
| qemu_log_mask(CPU_LOG_MMU, "PDC_BLOCK_TLB: PDC_BTLB_INFO\n"); |
| vaddr = probe_access(env, env->gr[24], 4 * sizeof(target_ulong), |
| MMU_DATA_STORE, mmu_idx, ra); |
| if (vaddr == NULL) { |
| env->gr[28] = -10; /* invalid argument */ |
| } else { |
| vaddr[0] = cpu_to_be32(1); |
| vaddr[1] = cpu_to_be32(16 * 1024); |
| vaddr[2] = cpu_to_be32(HPPA_BTLB_FIXED); |
| vaddr[3] = cpu_to_be32(HPPA_BTLB_VARIABLE); |
| } |
| break; |
| case 1: |
| /* insert BTLB entry */ |
| virt_page = env->gr[24]; /* upper 32 bits */ |
| virt_page <<= 32; |
| virt_page |= env->gr[23]; /* lower 32 bits */ |
| phys_page = env->gr[22]; |
| len = env->gr[21]; |
| slot = env->gr[19]; |
| qemu_log_mask(CPU_LOG_MMU, "PDC_BLOCK_TLB: PDC_BTLB_INSERT " |
| "0x%08llx-0x%08llx: vpage 0x%llx for phys page 0x%04x len %d " |
| "into slot %d\n", |
| (long long) virt_page << TARGET_PAGE_BITS, |
| (long long) (virt_page + len) << TARGET_PAGE_BITS, |
| (long long) virt_page, phys_page, len, slot); |
| if (slot < HPPA_BTLB_ENTRIES) { |
| btlb = &env->tlb[slot]; |
| /* force flush of possibly existing BTLB entry */ |
| hppa_flush_tlb_ent(env, btlb, true); |
| /* create new BTLB entry */ |
| btlb->va_b = virt_page << TARGET_PAGE_BITS; |
| btlb->va_e = btlb->va_b + len * TARGET_PAGE_SIZE - 1; |
| btlb->pa = phys_page << TARGET_PAGE_BITS; |
| set_access_bits(env, btlb, env->gr[20]); |
| btlb->t = 0; |
| btlb->d = 1; |
| } else { |
| env->gr[28] = -10; /* invalid argument */ |
| } |
| break; |
| case 2: |
| /* Purge BTLB entry */ |
| slot = env->gr[22]; |
| qemu_log_mask(CPU_LOG_MMU, "PDC_BLOCK_TLB: PDC_BTLB_PURGE slot %d\n", |
| slot); |
| if (slot < HPPA_BTLB_ENTRIES) { |
| btlb = &env->tlb[slot]; |
| hppa_flush_tlb_ent(env, btlb, true); |
| } else { |
| env->gr[28] = -10; /* invalid argument */ |
| } |
| break; |
| case 3: |
| /* Purge all BTLB entries */ |
| qemu_log_mask(CPU_LOG_MMU, "PDC_BLOCK_TLB: PDC_BTLB_PURGE_ALL\n"); |
| for (slot = 0; slot < HPPA_BTLB_ENTRIES; slot++) { |
| btlb = &env->tlb[slot]; |
| hppa_flush_tlb_ent(env, btlb, true); |
| } |
| break; |
| default: |
| env->gr[28] = -2; /* nonexistent option */ |
| break; |
| } |
| } |
