347 lines
10 KiB
C
347 lines
10 KiB
C
/*
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* HPPA memory access helper routines
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*
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* Copyright (c) 2017 Helge Deller
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "exec/helper-proto.h"
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#include "qom/cpu.h"
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#ifdef CONFIG_USER_ONLY
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int hppa_cpu_handle_mmu_fault(CPUState *cs, vaddr address,
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int size, int rw, int mmu_idx)
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{
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HPPACPU *cpu = HPPA_CPU(cs);
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/* ??? Test between data page fault and data memory protection trap,
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which would affect si_code. */
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cs->exception_index = EXCP_DMP;
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cpu->env.cr[CR_IOR] = address;
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return 1;
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}
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#else
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static hppa_tlb_entry *hppa_find_tlb(CPUHPPAState *env, vaddr addr)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(env->tlb); ++i) {
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hppa_tlb_entry *ent = &env->tlb[i];
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if (ent->va_b <= addr && addr <= ent->va_e) {
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return ent;
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}
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}
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return NULL;
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}
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static void hppa_flush_tlb_ent(CPUHPPAState *env, hppa_tlb_entry *ent)
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{
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CPUState *cs = CPU(hppa_env_get_cpu(env));
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unsigned i, n = 1 << (2 * ent->page_size);
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uint64_t addr = ent->va_b;
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for (i = 0; i < n; ++i, addr += TARGET_PAGE_SIZE) {
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/* Do not flush MMU_PHYS_IDX. */
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tlb_flush_page_by_mmuidx(cs, addr, 0xf);
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}
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memset(ent, 0, sizeof(*ent));
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ent->va_b = -1;
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}
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static hppa_tlb_entry *hppa_alloc_tlb_ent(CPUHPPAState *env)
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{
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hppa_tlb_entry *ent;
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uint32_t i = env->tlb_last;
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env->tlb_last = (i == ARRAY_SIZE(env->tlb) - 1 ? 0 : i + 1);
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ent = &env->tlb[i];
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hppa_flush_tlb_ent(env, ent);
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return ent;
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}
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int hppa_get_physical_address(CPUHPPAState *env, vaddr addr, int mmu_idx,
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int type, hwaddr *pphys, int *pprot)
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{
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hwaddr phys;
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int prot, r_prot, w_prot, x_prot;
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hppa_tlb_entry *ent;
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int ret = -1;
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/* Virtual translation disabled. Direct map virtual to physical. */
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if (mmu_idx == MMU_PHYS_IDX) {
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phys = addr;
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prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
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goto egress;
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}
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/* Find a valid tlb entry that matches the virtual address. */
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ent = hppa_find_tlb(env, addr);
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if (ent == NULL || !ent->entry_valid) {
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phys = 0;
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prot = 0;
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ret = (type & PAGE_EXEC ? EXCP_ITLB_MISS : EXCP_DTLB_MISS);
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goto egress;
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}
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/* We now know the physical address. */
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phys = ent->pa + (addr & ~TARGET_PAGE_MASK);
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/* Map TLB access_rights field to QEMU protection. */
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r_prot = (mmu_idx <= ent->ar_pl1) * PAGE_READ;
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w_prot = (mmu_idx <= ent->ar_pl2) * PAGE_WRITE;
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x_prot = (ent->ar_pl2 <= mmu_idx && mmu_idx <= ent->ar_pl1) * PAGE_EXEC;
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switch (ent->ar_type) {
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case 0: /* read-only: data page */
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prot = r_prot;
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break;
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case 1: /* read/write: dynamic data page */
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prot = r_prot | w_prot;
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break;
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case 2: /* read/execute: normal code page */
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prot = r_prot | x_prot;
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break;
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case 3: /* read/write/execute: dynamic code page */
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prot = r_prot | w_prot | x_prot;
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break;
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default: /* execute: promote to privilege level type & 3 */
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prot = x_prot;
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break;
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}
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/* ??? Check PSW_P and ent->access_prot. This can remove PAGE_WRITE. */
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/* No guest access type indicates a non-architectural access from
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within QEMU. Bypass checks for access, D, B and T bits. */
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if (type == 0) {
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goto egress;
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}
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if (unlikely(!(prot & type))) {
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/* The access isn't allowed -- Inst/Data Memory Protection Fault. */
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ret = (type & PAGE_EXEC ? EXCP_IMP : EXCP_DMP);
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goto egress;
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}
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/* In reverse priority order, check for conditions which raise faults.
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As we go, remove PROT bits that cover the condition we want to check.
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In this way, the resulting PROT will force a re-check of the
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architectural TLB entry for the next access. */
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if (unlikely(!ent->d)) {
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if (type & PAGE_WRITE) {
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/* The D bit is not set -- TLB Dirty Bit Fault. */
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ret = EXCP_TLB_DIRTY;
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}
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prot &= PAGE_READ | PAGE_EXEC;
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}
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if (unlikely(ent->b)) {
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if (type & PAGE_WRITE) {
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/* The B bit is set -- Data Memory Break Fault. */
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ret = EXCP_DMB;
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}
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prot &= PAGE_READ | PAGE_EXEC;
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}
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if (unlikely(ent->t)) {
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if (!(type & PAGE_EXEC)) {
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/* The T bit is set -- Page Reference Fault. */
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ret = EXCP_PAGE_REF;
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}
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prot &= PAGE_EXEC;
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}
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egress:
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*pphys = phys;
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*pprot = prot;
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return ret;
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}
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hwaddr hppa_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
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{
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HPPACPU *cpu = HPPA_CPU(cs);
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hwaddr phys;
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int prot, excp;
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/* If the (data) mmu is disabled, bypass translation. */
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/* ??? We really ought to know if the code mmu is disabled too,
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in order to get the correct debugging dumps. */
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if (!(cpu->env.psw & PSW_D)) {
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return addr;
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}
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excp = hppa_get_physical_address(&cpu->env, addr, MMU_KERNEL_IDX, 0,
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&phys, &prot);
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/* Since we're translating for debugging, the only error that is a
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hard error is no translation at all. Otherwise, while a real cpu
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access might not have permission, the debugger does. */
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return excp == EXCP_DTLB_MISS ? -1 : phys;
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}
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void tlb_fill(CPUState *cs, target_ulong addr, int size,
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MMUAccessType type, int mmu_idx, uintptr_t retaddr)
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{
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HPPACPU *cpu = HPPA_CPU(cs);
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int prot, excp, a_prot;
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hwaddr phys;
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switch (type) {
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case MMU_INST_FETCH:
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a_prot = PAGE_EXEC;
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break;
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case MMU_DATA_STORE:
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a_prot = PAGE_WRITE;
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break;
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default:
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a_prot = PAGE_READ;
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break;
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}
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excp = hppa_get_physical_address(&cpu->env, addr, mmu_idx,
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a_prot, &phys, &prot);
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if (unlikely(excp >= 0)) {
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/* Failure. Raise the indicated exception. */
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cs->exception_index = excp;
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if (cpu->env.psw & PSW_Q) {
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/* ??? Needs tweaking for hppa64. */
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cpu->env.cr[CR_IOR] = addr;
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cpu->env.cr[CR_ISR] = addr >> 32;
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}
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cpu_loop_exit_restore(cs, retaddr);
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}
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/* Success! Store the translation into the QEMU TLB. */
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tlb_set_page(cs, addr & TARGET_PAGE_MASK, phys & TARGET_PAGE_MASK,
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prot, mmu_idx, TARGET_PAGE_SIZE);
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}
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/* Insert (Insn/Data) TLB Address. Note this is PA 1.1 only. */
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void HELPER(itlba)(CPUHPPAState *env, target_ulong addr, target_ureg reg)
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{
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hppa_tlb_entry *empty = NULL;
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int i;
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/* Zap any old entries covering ADDR; notice empty entries on the way. */
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for (i = 0; i < ARRAY_SIZE(env->tlb); ++i) {
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hppa_tlb_entry *ent = &env->tlb[i];
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if (!ent->entry_valid) {
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empty = ent;
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} else if (ent->va_b <= addr && addr <= ent->va_e) {
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hppa_flush_tlb_ent(env, ent);
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empty = ent;
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}
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}
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/* If we didn't see an empty entry, evict one. */
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if (empty == NULL) {
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empty = hppa_alloc_tlb_ent(env);
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}
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/* Note that empty->entry_valid == 0 already. */
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empty->va_b = addr & TARGET_PAGE_MASK;
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empty->va_e = empty->va_b + TARGET_PAGE_SIZE - 1;
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empty->pa = extract32(reg, 5, 20) << TARGET_PAGE_BITS;
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}
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/* Insert (Insn/Data) TLB Protection. Note this is PA 1.1 only. */
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void HELPER(itlbp)(CPUHPPAState *env, target_ulong addr, target_ureg reg)
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{
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hppa_tlb_entry *ent = hppa_find_tlb(env, addr);
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if (unlikely(ent == NULL || ent->entry_valid)) {
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qemu_log_mask(LOG_GUEST_ERROR, "ITLBP not following ITLBA\n");
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return;
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}
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ent->access_id = extract32(reg, 1, 18);
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ent->u = extract32(reg, 19, 1);
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ent->ar_pl2 = extract32(reg, 20, 2);
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ent->ar_pl1 = extract32(reg, 22, 2);
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ent->ar_type = extract32(reg, 24, 3);
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ent->b = extract32(reg, 27, 1);
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ent->d = extract32(reg, 28, 1);
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ent->t = extract32(reg, 29, 1);
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ent->entry_valid = 1;
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}
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/* Purge (Insn/Data) TLB. This is explicitly page-based, and is
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synchronous across all processors. */
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static void ptlb_work(CPUState *cpu, run_on_cpu_data data)
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{
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CPUHPPAState *env = cpu->env_ptr;
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target_ulong addr = (target_ulong) data.target_ptr;
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hppa_tlb_entry *ent = hppa_find_tlb(env, addr);
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if (ent && ent->entry_valid) {
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hppa_flush_tlb_ent(env, ent);
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}
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}
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void HELPER(ptlb)(CPUHPPAState *env, target_ulong addr)
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{
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CPUState *src = CPU(hppa_env_get_cpu(env));
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CPUState *cpu;
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run_on_cpu_data data = RUN_ON_CPU_TARGET_PTR(addr);
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CPU_FOREACH(cpu) {
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if (cpu != src) {
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async_run_on_cpu(cpu, ptlb_work, data);
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}
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}
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async_safe_run_on_cpu(src, ptlb_work, data);
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}
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/* Purge (Insn/Data) TLB entry. This affects an implementation-defined
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number of pages/entries (we choose all), and is local to the cpu. */
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void HELPER(ptlbe)(CPUHPPAState *env)
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{
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CPUState *src = CPU(hppa_env_get_cpu(env));
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memset(env->tlb, 0, sizeof(env->tlb));
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tlb_flush_by_mmuidx(src, 0xf);
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}
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target_ureg HELPER(lpa)(CPUHPPAState *env, target_ulong addr)
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{
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hwaddr phys;
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int prot, excp;
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excp = hppa_get_physical_address(env, addr, MMU_KERNEL_IDX, 0,
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&phys, &prot);
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if (excp >= 0) {
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if (env->psw & PSW_Q) {
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/* ??? Needs tweaking for hppa64. */
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env->cr[CR_IOR] = addr;
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env->cr[CR_ISR] = addr >> 32;
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}
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if (excp == EXCP_DTLB_MISS) {
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excp = EXCP_NA_DTLB_MISS;
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}
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hppa_dynamic_excp(env, excp, GETPC());
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}
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return phys;
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}
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/* Return the ar_type of the TLB at VADDR, or -1. */
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int hppa_artype_for_page(CPUHPPAState *env, target_ulong vaddr)
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{
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hppa_tlb_entry *ent = hppa_find_tlb(env, vaddr);
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return ent ? ent->ar_type : -1;
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}
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#endif /* CONFIG_USER_ONLY */
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