Under some circumstances, we need to direct ISI and DSI interrupts at the hypervisor, turning them into HISI/HDSI, and using different SPRs (HDSISR and HDAR) depending on the combination of MSR_DR and the corresponding VPM bits in LPCR. This moves part of the code into helpers that are fixed to select the right exception type and registers. On pre-P7 processors, LPCR is 0 which provides the old behaviour of directing the interrupts at the supervisor. Thanks to Andrei Warkentin for finding a bug when HV=1 Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> [clg: Merged a fix on POWERPC_EXCP_HDSI fixing the condition on msr_hv, from Andrei Warkentin <andrey.warkentin@gmail.com> ] Signed-off-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
854 lines
24 KiB
C
854 lines
24 KiB
C
/*
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* PowerPC MMU, TLB, SLB and BAT emulation helpers for QEMU.
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*
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* Copyright (c) 2003-2007 Jocelyn Mayer
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* Copyright (c) 2013 David Gibson, IBM Corporation
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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 "qapi/error.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 "qemu/error-report.h"
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#include "sysemu/kvm.h"
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#include "qemu/error-report.h"
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#include "kvm_ppc.h"
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#include "mmu-hash64.h"
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#include "exec/log.h"
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//#define DEBUG_SLB
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#ifdef DEBUG_SLB
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# define LOG_SLB(...) qemu_log_mask(CPU_LOG_MMU, __VA_ARGS__)
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#else
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# define LOG_SLB(...) do { } while (0)
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#endif
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/*
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* Used to indicate that a CPU has its hash page table (HPT) managed
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* within the host kernel
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*/
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#define MMU_HASH64_KVM_MANAGED_HPT ((void *)-1)
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/*
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* SLB handling
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*/
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static ppc_slb_t *slb_lookup(PowerPCCPU *cpu, target_ulong eaddr)
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{
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CPUPPCState *env = &cpu->env;
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uint64_t esid_256M, esid_1T;
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int n;
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LOG_SLB("%s: eaddr " TARGET_FMT_lx "\n", __func__, eaddr);
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esid_256M = (eaddr & SEGMENT_MASK_256M) | SLB_ESID_V;
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esid_1T = (eaddr & SEGMENT_MASK_1T) | SLB_ESID_V;
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for (n = 0; n < env->slb_nr; n++) {
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ppc_slb_t *slb = &env->slb[n];
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LOG_SLB("%s: slot %d %016" PRIx64 " %016"
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PRIx64 "\n", __func__, n, slb->esid, slb->vsid);
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/* We check for 1T matches on all MMUs here - if the MMU
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* doesn't have 1T segment support, we will have prevented 1T
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* entries from being inserted in the slbmte code. */
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if (((slb->esid == esid_256M) &&
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((slb->vsid & SLB_VSID_B) == SLB_VSID_B_256M))
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|| ((slb->esid == esid_1T) &&
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((slb->vsid & SLB_VSID_B) == SLB_VSID_B_1T))) {
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return slb;
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}
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}
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return NULL;
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}
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void dump_slb(FILE *f, fprintf_function cpu_fprintf, PowerPCCPU *cpu)
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{
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CPUPPCState *env = &cpu->env;
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int i;
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uint64_t slbe, slbv;
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cpu_synchronize_state(CPU(cpu));
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cpu_fprintf(f, "SLB\tESID\t\t\tVSID\n");
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for (i = 0; i < env->slb_nr; i++) {
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slbe = env->slb[i].esid;
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slbv = env->slb[i].vsid;
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if (slbe == 0 && slbv == 0) {
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continue;
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}
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cpu_fprintf(f, "%d\t0x%016" PRIx64 "\t0x%016" PRIx64 "\n",
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i, slbe, slbv);
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}
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}
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void helper_slbia(CPUPPCState *env)
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{
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int n;
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/* XXX: Warning: slbia never invalidates the first segment */
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for (n = 1; n < env->slb_nr; n++) {
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ppc_slb_t *slb = &env->slb[n];
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if (slb->esid & SLB_ESID_V) {
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slb->esid &= ~SLB_ESID_V;
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/* XXX: given the fact that segment size is 256 MB or 1TB,
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* and we still don't have a tlb_flush_mask(env, n, mask)
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* in QEMU, we just invalidate all TLBs
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*/
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env->tlb_need_flush = 1;
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}
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}
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}
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void helper_slbie(CPUPPCState *env, target_ulong addr)
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{
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PowerPCCPU *cpu = ppc_env_get_cpu(env);
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ppc_slb_t *slb;
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slb = slb_lookup(cpu, addr);
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if (!slb) {
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return;
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}
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if (slb->esid & SLB_ESID_V) {
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slb->esid &= ~SLB_ESID_V;
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/* XXX: given the fact that segment size is 256 MB or 1TB,
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* and we still don't have a tlb_flush_mask(env, n, mask)
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* in QEMU, we just invalidate all TLBs
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*/
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env->tlb_need_flush = 1;
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}
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}
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int ppc_store_slb(PowerPCCPU *cpu, target_ulong slot,
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target_ulong esid, target_ulong vsid)
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{
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CPUPPCState *env = &cpu->env;
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ppc_slb_t *slb = &env->slb[slot];
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const struct ppc_one_seg_page_size *sps = NULL;
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int i;
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if (slot >= env->slb_nr) {
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return -1; /* Bad slot number */
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}
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if (esid & ~(SLB_ESID_ESID | SLB_ESID_V)) {
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return -1; /* Reserved bits set */
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}
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if (vsid & (SLB_VSID_B & ~SLB_VSID_B_1T)) {
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return -1; /* Bad segment size */
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}
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if ((vsid & SLB_VSID_B) && !(env->mmu_model & POWERPC_MMU_1TSEG)) {
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return -1; /* 1T segment on MMU that doesn't support it */
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}
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for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
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const struct ppc_one_seg_page_size *sps1 = &env->sps.sps[i];
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if (!sps1->page_shift) {
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break;
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}
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if ((vsid & SLB_VSID_LLP_MASK) == sps1->slb_enc) {
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sps = sps1;
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break;
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}
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}
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if (!sps) {
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error_report("Bad page size encoding in SLB store: slot "TARGET_FMT_lu
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" esid 0x"TARGET_FMT_lx" vsid 0x"TARGET_FMT_lx,
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slot, esid, vsid);
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return -1;
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}
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slb->esid = esid;
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slb->vsid = vsid;
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slb->sps = sps;
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LOG_SLB("%s: %d " TARGET_FMT_lx " - " TARGET_FMT_lx " => %016" PRIx64
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" %016" PRIx64 "\n", __func__, slot, esid, vsid,
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slb->esid, slb->vsid);
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return 0;
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}
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static int ppc_load_slb_esid(PowerPCCPU *cpu, target_ulong rb,
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target_ulong *rt)
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{
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CPUPPCState *env = &cpu->env;
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int slot = rb & 0xfff;
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ppc_slb_t *slb = &env->slb[slot];
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if (slot >= env->slb_nr) {
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return -1;
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}
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*rt = slb->esid;
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return 0;
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}
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static int ppc_load_slb_vsid(PowerPCCPU *cpu, target_ulong rb,
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target_ulong *rt)
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{
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CPUPPCState *env = &cpu->env;
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int slot = rb & 0xfff;
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ppc_slb_t *slb = &env->slb[slot];
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if (slot >= env->slb_nr) {
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return -1;
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}
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*rt = slb->vsid;
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return 0;
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}
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static int ppc_find_slb_vsid(PowerPCCPU *cpu, target_ulong rb,
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target_ulong *rt)
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{
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CPUPPCState *env = &cpu->env;
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ppc_slb_t *slb;
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if (!msr_is_64bit(env, env->msr)) {
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rb &= 0xffffffff;
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}
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slb = slb_lookup(cpu, rb);
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if (slb == NULL) {
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*rt = (target_ulong)-1ul;
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} else {
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*rt = slb->vsid;
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}
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return 0;
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}
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void helper_store_slb(CPUPPCState *env, target_ulong rb, target_ulong rs)
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{
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PowerPCCPU *cpu = ppc_env_get_cpu(env);
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if (ppc_store_slb(cpu, rb & 0xfff, rb & ~0xfffULL, rs) < 0) {
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helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
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POWERPC_EXCP_INVAL);
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}
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}
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target_ulong helper_load_slb_esid(CPUPPCState *env, target_ulong rb)
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{
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PowerPCCPU *cpu = ppc_env_get_cpu(env);
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target_ulong rt = 0;
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if (ppc_load_slb_esid(cpu, rb, &rt) < 0) {
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helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
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POWERPC_EXCP_INVAL);
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}
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return rt;
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}
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target_ulong helper_find_slb_vsid(CPUPPCState *env, target_ulong rb)
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{
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PowerPCCPU *cpu = ppc_env_get_cpu(env);
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target_ulong rt = 0;
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if (ppc_find_slb_vsid(cpu, rb, &rt) < 0) {
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helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
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POWERPC_EXCP_INVAL);
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}
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return rt;
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}
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target_ulong helper_load_slb_vsid(CPUPPCState *env, target_ulong rb)
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{
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PowerPCCPU *cpu = ppc_env_get_cpu(env);
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target_ulong rt = 0;
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if (ppc_load_slb_vsid(cpu, rb, &rt) < 0) {
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helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
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POWERPC_EXCP_INVAL);
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}
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return rt;
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}
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/*
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* 64-bit hash table MMU handling
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*/
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void ppc_hash64_set_sdr1(PowerPCCPU *cpu, target_ulong value,
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Error **errp)
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{
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CPUPPCState *env = &cpu->env;
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target_ulong htabsize = value & SDR_64_HTABSIZE;
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env->spr[SPR_SDR1] = value;
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if (htabsize > 28) {
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error_setg(errp,
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"Invalid HTABSIZE 0x" TARGET_FMT_lx" stored in SDR1",
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htabsize);
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htabsize = 28;
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}
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env->htab_mask = (1ULL << (htabsize + 18 - 7)) - 1;
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env->htab_base = value & SDR_64_HTABORG;
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}
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void ppc_hash64_set_external_hpt(PowerPCCPU *cpu, void *hpt, int shift,
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Error **errp)
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{
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CPUPPCState *env = &cpu->env;
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Error *local_err = NULL;
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if (hpt) {
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env->external_htab = hpt;
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} else {
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env->external_htab = MMU_HASH64_KVM_MANAGED_HPT;
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}
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ppc_hash64_set_sdr1(cpu, (target_ulong)(uintptr_t)hpt | (shift - 18),
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&local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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/* Not strictly necessary, but makes it clearer that an external
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* htab is in use when debugging */
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env->htab_base = -1;
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if (kvm_enabled()) {
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if (kvmppc_put_books_sregs(cpu) < 0) {
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error_setg(errp, "Unable to update SDR1 in KVM");
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}
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}
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}
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static int ppc_hash64_pte_prot(PowerPCCPU *cpu,
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ppc_slb_t *slb, ppc_hash_pte64_t pte)
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{
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CPUPPCState *env = &cpu->env;
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unsigned pp, key;
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/* Some pp bit combinations have undefined behaviour, so default
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* to no access in those cases */
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int prot = 0;
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key = !!(msr_pr ? (slb->vsid & SLB_VSID_KP)
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: (slb->vsid & SLB_VSID_KS));
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pp = (pte.pte1 & HPTE64_R_PP) | ((pte.pte1 & HPTE64_R_PP0) >> 61);
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if (key == 0) {
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switch (pp) {
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case 0x0:
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case 0x1:
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case 0x2:
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prot = PAGE_READ | PAGE_WRITE;
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break;
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case 0x3:
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case 0x6:
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prot = PAGE_READ;
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break;
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}
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} else {
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switch (pp) {
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case 0x0:
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case 0x6:
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prot = 0;
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break;
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case 0x1:
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case 0x3:
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prot = PAGE_READ;
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break;
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case 0x2:
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prot = PAGE_READ | PAGE_WRITE;
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break;
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}
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}
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/* No execute if either noexec or guarded bits set */
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if (!(pte.pte1 & HPTE64_R_N) || (pte.pte1 & HPTE64_R_G)
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|| (slb->vsid & SLB_VSID_N)) {
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prot |= PAGE_EXEC;
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}
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return prot;
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}
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static int ppc_hash64_amr_prot(PowerPCCPU *cpu, ppc_hash_pte64_t pte)
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{
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CPUPPCState *env = &cpu->env;
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int key, amrbits;
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int prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
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/* Only recent MMUs implement Virtual Page Class Key Protection */
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if (!(env->mmu_model & POWERPC_MMU_AMR)) {
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return prot;
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}
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key = HPTE64_R_KEY(pte.pte1);
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amrbits = (env->spr[SPR_AMR] >> 2*(31 - key)) & 0x3;
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/* fprintf(stderr, "AMR protection: key=%d AMR=0x%" PRIx64 "\n", key, */
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/* env->spr[SPR_AMR]); */
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/*
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* A store is permitted if the AMR bit is 0. Remove write
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* protection if it is set.
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*/
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if (amrbits & 0x2) {
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prot &= ~PAGE_WRITE;
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}
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/*
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* A load is permitted if the AMR bit is 0. Remove read
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* protection if it is set.
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*/
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if (amrbits & 0x1) {
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prot &= ~PAGE_READ;
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}
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return prot;
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}
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uint64_t ppc_hash64_start_access(PowerPCCPU *cpu, target_ulong pte_index)
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{
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uint64_t token = 0;
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hwaddr pte_offset;
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pte_offset = pte_index * HASH_PTE_SIZE_64;
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if (cpu->env.external_htab == MMU_HASH64_KVM_MANAGED_HPT) {
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/*
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* HTAB is controlled by KVM. Fetch the PTEG into a new buffer.
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*/
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token = kvmppc_hash64_read_pteg(cpu, pte_index);
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} else if (cpu->env.external_htab) {
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/*
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* HTAB is controlled by QEMU. Just point to the internally
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* accessible PTEG.
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*/
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token = (uint64_t)(uintptr_t) cpu->env.external_htab + pte_offset;
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} else if (cpu->env.htab_base) {
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token = cpu->env.htab_base + pte_offset;
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}
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return token;
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}
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void ppc_hash64_stop_access(PowerPCCPU *cpu, uint64_t token)
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{
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if (cpu->env.external_htab == MMU_HASH64_KVM_MANAGED_HPT) {
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kvmppc_hash64_free_pteg(token);
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}
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}
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static hwaddr ppc_hash64_pteg_search(PowerPCCPU *cpu, hwaddr hash,
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bool secondary, target_ulong ptem,
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ppc_hash_pte64_t *pte)
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{
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CPUPPCState *env = &cpu->env;
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int i;
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uint64_t token;
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target_ulong pte0, pte1;
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target_ulong pte_index;
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pte_index = (hash & env->htab_mask) * HPTES_PER_GROUP;
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token = ppc_hash64_start_access(cpu, pte_index);
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if (!token) {
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return -1;
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}
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for (i = 0; i < HPTES_PER_GROUP; i++) {
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pte0 = ppc_hash64_load_hpte0(cpu, token, i);
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pte1 = ppc_hash64_load_hpte1(cpu, token, i);
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if ((pte0 & HPTE64_V_VALID)
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&& (secondary == !!(pte0 & HPTE64_V_SECONDARY))
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&& HPTE64_V_COMPARE(pte0, ptem)) {
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pte->pte0 = pte0;
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pte->pte1 = pte1;
|
|
ppc_hash64_stop_access(cpu, token);
|
|
return (pte_index + i) * HASH_PTE_SIZE_64;
|
|
}
|
|
}
|
|
ppc_hash64_stop_access(cpu, token);
|
|
/*
|
|
* We didn't find a valid entry.
|
|
*/
|
|
return -1;
|
|
}
|
|
|
|
static hwaddr ppc_hash64_htab_lookup(PowerPCCPU *cpu,
|
|
ppc_slb_t *slb, target_ulong eaddr,
|
|
ppc_hash_pte64_t *pte)
|
|
{
|
|
CPUPPCState *env = &cpu->env;
|
|
hwaddr pte_offset;
|
|
hwaddr hash;
|
|
uint64_t vsid, epnmask, epn, ptem;
|
|
|
|
/* The SLB store path should prevent any bad page size encodings
|
|
* getting in there, so: */
|
|
assert(slb->sps);
|
|
|
|
epnmask = ~((1ULL << slb->sps->page_shift) - 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 >> slb->sps->page_shift);
|
|
} else {
|
|
/* 256M segment */
|
|
vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT;
|
|
epn = (eaddr & ~SEGMENT_MASK_256M) & epnmask;
|
|
hash = vsid ^ (epn >> slb->sps->page_shift);
|
|
}
|
|
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(cpu, 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(cpu, ~hash, 1, ptem, pte);
|
|
}
|
|
|
|
return pte_offset;
|
|
}
|
|
|
|
static unsigned hpte_page_shift(const struct ppc_one_seg_page_size *sps,
|
|
uint64_t pte0, uint64_t pte1)
|
|
{
|
|
int i;
|
|
|
|
if (!(pte0 & HPTE64_V_LARGE)) {
|
|
if (sps->page_shift != 12) {
|
|
/* 4kiB page in a non 4kiB segment */
|
|
return 0;
|
|
}
|
|
/* Normal 4kiB page */
|
|
return 12;
|
|
}
|
|
|
|
for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
|
|
const struct ppc_one_page_size *ps = &sps->enc[i];
|
|
uint64_t mask;
|
|
|
|
if (!ps->page_shift) {
|
|
break;
|
|
}
|
|
|
|
if (ps->page_shift == 12) {
|
|
/* L bit is set so this can't be a 4kiB page */
|
|
continue;
|
|
}
|
|
|
|
mask = ((1ULL << ps->page_shift) - 1) & HPTE64_R_RPN;
|
|
|
|
if ((pte1 & mask) == (ps->pte_enc << HPTE64_R_RPN_SHIFT)) {
|
|
return ps->page_shift;
|
|
}
|
|
}
|
|
|
|
return 0; /* Bad page size encoding */
|
|
}
|
|
|
|
unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu,
|
|
uint64_t pte0, uint64_t pte1,
|
|
unsigned *seg_page_shift)
|
|
{
|
|
CPUPPCState *env = &cpu->env;
|
|
int i;
|
|
|
|
if (!(pte0 & HPTE64_V_LARGE)) {
|
|
*seg_page_shift = 12;
|
|
return 12;
|
|
}
|
|
|
|
/*
|
|
* The encodings in env->sps need to be carefully chosen so that
|
|
* this gives an unambiguous result.
|
|
*/
|
|
for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
|
|
const struct ppc_one_seg_page_size *sps = &env->sps.sps[i];
|
|
unsigned shift;
|
|
|
|
if (!sps->page_shift) {
|
|
break;
|
|
}
|
|
|
|
shift = hpte_page_shift(sps, pte0, pte1);
|
|
if (shift) {
|
|
*seg_page_shift = sps->page_shift;
|
|
return shift;
|
|
}
|
|
}
|
|
|
|
*seg_page_shift = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void ppc_hash64_set_isi(CPUState *cs, CPUPPCState *env,
|
|
uint64_t error_code)
|
|
{
|
|
bool vpm;
|
|
|
|
if (msr_ir) {
|
|
vpm = !!(env->spr[SPR_LPCR] & LPCR_VPM1);
|
|
} else {
|
|
vpm = !!(env->spr[SPR_LPCR] & LPCR_VPM0);
|
|
}
|
|
if (vpm && !msr_hv) {
|
|
cs->exception_index = POWERPC_EXCP_HISI;
|
|
} else {
|
|
cs->exception_index = POWERPC_EXCP_ISI;
|
|
}
|
|
env->error_code = error_code;
|
|
}
|
|
|
|
static void ppc_hash64_set_dsi(CPUState *cs, CPUPPCState *env, uint64_t dar,
|
|
uint64_t dsisr)
|
|
{
|
|
bool vpm;
|
|
|
|
if (msr_dr) {
|
|
vpm = !!(env->spr[SPR_LPCR] & LPCR_VPM1);
|
|
} else {
|
|
vpm = !!(env->spr[SPR_LPCR] & LPCR_VPM0);
|
|
}
|
|
if (vpm && !msr_hv) {
|
|
cs->exception_index = POWERPC_EXCP_HDSI;
|
|
env->spr[SPR_HDAR] = dar;
|
|
env->spr[SPR_HDSISR] = dsisr;
|
|
} else {
|
|
cs->exception_index = POWERPC_EXCP_DSI;
|
|
env->spr[SPR_DAR] = dar;
|
|
env->spr[SPR_DSISR] = dsisr;
|
|
}
|
|
env->error_code = 0;
|
|
}
|
|
|
|
|
|
int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
|
|
int rwx, int mmu_idx)
|
|
{
|
|
CPUState *cs = CPU(cpu);
|
|
CPUPPCState *env = &cpu->env;
|
|
ppc_slb_t *slb;
|
|
unsigned apshift;
|
|
hwaddr pte_offset;
|
|
ppc_hash_pte64_t pte;
|
|
int pp_prot, amr_prot, prot;
|
|
uint64_t new_pte1, dsisr;
|
|
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(cpu, 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)) {
|
|
ppc_hash64_set_isi(cs, env, 0x10000000);
|
|
return 1;
|
|
}
|
|
|
|
/* 4. Locate the PTE in the hash table */
|
|
pte_offset = ppc_hash64_htab_lookup(cpu, slb, eaddr, &pte);
|
|
if (pte_offset == -1) {
|
|
dsisr = 0x40000000;
|
|
if (rwx == 2) {
|
|
ppc_hash64_set_isi(cs, env, dsisr);
|
|
} else {
|
|
if (rwx == 1) {
|
|
dsisr |= 0x02000000;
|
|
}
|
|
ppc_hash64_set_dsi(cs, env, eaddr, dsisr);
|
|
}
|
|
return 1;
|
|
}
|
|
qemu_log_mask(CPU_LOG_MMU,
|
|
"found PTE at offset %08" HWADDR_PRIx "\n", pte_offset);
|
|
|
|
/* Validate page size encoding */
|
|
apshift = hpte_page_shift(slb->sps, pte.pte0, pte.pte1);
|
|
if (!apshift) {
|
|
error_report("Bad page size encoding in HPTE 0x%"PRIx64" - 0x%"PRIx64
|
|
" @ 0x%"HWADDR_PRIx, pte.pte0, pte.pte1, pte_offset);
|
|
/* Not entirely sure what the right action here, but machine
|
|
* check seems reasonable */
|
|
cs->exception_index = POWERPC_EXCP_MCHECK;
|
|
env->error_code = 0;
|
|
return 1;
|
|
}
|
|
|
|
/* 5. Check access permissions */
|
|
|
|
pp_prot = ppc_hash64_pte_prot(cpu, slb, pte);
|
|
amr_prot = ppc_hash64_amr_prot(cpu, 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) {
|
|
ppc_hash64_set_isi(cs, env, 0x08000000);
|
|
} else {
|
|
dsisr = 0;
|
|
if (need_prot[rwx] & ~pp_prot) {
|
|
dsisr |= 0x08000000;
|
|
}
|
|
if (rwx == 1) {
|
|
dsisr |= 0x02000000;
|
|
}
|
|
if (need_prot[rwx] & ~amr_prot) {
|
|
dsisr |= 0x00200000;
|
|
}
|
|
ppc_hash64_set_dsi(cs, env, eaddr, 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(cpu, pte_offset / HASH_PTE_SIZE_64,
|
|
pte.pte0, new_pte1);
|
|
}
|
|
|
|
/* 7. Determine the real address from the PTE */
|
|
|
|
raddr = deposit64(pte.pte1 & HPTE64_R_RPN, 0, apshift, eaddr);
|
|
|
|
tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
|
|
prot, mmu_idx, 1ULL << apshift);
|
|
|
|
return 0;
|
|
}
|
|
|
|
hwaddr ppc_hash64_get_phys_page_debug(PowerPCCPU *cpu, target_ulong addr)
|
|
{
|
|
CPUPPCState *env = &cpu->env;
|
|
ppc_slb_t *slb;
|
|
hwaddr pte_offset;
|
|
ppc_hash_pte64_t pte;
|
|
unsigned apshift;
|
|
|
|
if (msr_dr == 0) {
|
|
/* In real mode the top 4 effective address bits are ignored */
|
|
return addr & 0x0FFFFFFFFFFFFFFFULL;
|
|
}
|
|
|
|
slb = slb_lookup(cpu, addr);
|
|
if (!slb) {
|
|
return -1;
|
|
}
|
|
|
|
pte_offset = ppc_hash64_htab_lookup(cpu, slb, addr, &pte);
|
|
if (pte_offset == -1) {
|
|
return -1;
|
|
}
|
|
|
|
apshift = hpte_page_shift(slb->sps, pte.pte0, pte.pte1);
|
|
if (!apshift) {
|
|
return -1;
|
|
}
|
|
|
|
return deposit64(pte.pte1 & HPTE64_R_RPN, 0, apshift, addr)
|
|
& TARGET_PAGE_MASK;
|
|
}
|
|
|
|
void ppc_hash64_store_hpte(PowerPCCPU *cpu,
|
|
target_ulong pte_index,
|
|
target_ulong pte0, target_ulong pte1)
|
|
{
|
|
CPUPPCState *env = &cpu->env;
|
|
|
|
if (env->external_htab == MMU_HASH64_KVM_MANAGED_HPT) {
|
|
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(CPU(cpu)->as, env->htab_base + pte_index, pte0);
|
|
stq_phys(CPU(cpu)->as,
|
|
env->htab_base + pte_index + HASH_PTE_SIZE_64 / 2, pte1);
|
|
}
|
|
}
|
|
|
|
void ppc_hash64_tlb_flush_hpte(PowerPCCPU *cpu,
|
|
target_ulong pte_index,
|
|
target_ulong pte0, target_ulong pte1)
|
|
{
|
|
/*
|
|
* XXX: given the fact that there are too many segments to
|
|
* invalidate, 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);
|
|
}
|