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qemu/target/ppc/mmu-booke.c
BALATON Zoltan e7baac649b target/ppc: Move out BookE and related MMU functions from mmu_common.c 
Add a new mmu-booke.c file for BookE and related MMU bits from
mmu_common.c.

Acked-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:43:13 +10:00

532 lines
16 KiB
C
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/*
* PowerPC BookE MMU, TLB emulation helpers for QEMU.
*
* Copyright (c) 2003-2007 Jocelyn Mayer
*
* 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 "exec/page-protection.h"
#include "exec/log.h"
#include "cpu.h"
#include "internal.h"
#include "mmu-booke.h"
/* Generic TLB check function for embedded PowerPC implementations */
static bool ppcemb_tlb_check(CPUPPCState *env, ppcemb_tlb_t *tlb,
hwaddr *raddrp,
target_ulong address, uint32_t pid, int i)
{
target_ulong mask;
/* Check valid flag */
if (!(tlb->prot & PAGE_VALID)) {
return false;
}
mask = ~(tlb->size - 1);
qemu_log_mask(CPU_LOG_MMU, "%s: TLB %d address " TARGET_FMT_lx
" PID %u <=> " TARGET_FMT_lx " " TARGET_FMT_lx " %u %x\n",
__func__, i, address, pid, tlb->EPN,
mask, (uint32_t)tlb->PID, tlb->prot);
/* Check PID */
if (tlb->PID != 0 && tlb->PID != pid) {
return false;
}
/* Check effective address */
if ((address & mask) != tlb->EPN) {
return false;
}
*raddrp = (tlb->RPN & mask) | (address & ~mask);
return true;
}
/* Generic TLB search function for PowerPC embedded implementations */
int ppcemb_tlb_search(CPUPPCState *env, target_ulong address, uint32_t pid)
{
ppcemb_tlb_t *tlb;
hwaddr raddr;
int i;
for (i = 0; i < env->nb_tlb; i++) {
tlb = &env->tlb.tlbe[i];
if (ppcemb_tlb_check(env, tlb, &raddr, address, pid, i)) {
return i;
}
}
return -1;
}
int mmu40x_get_physical_address(CPUPPCState *env, hwaddr *raddr, int *prot,
target_ulong address,
MMUAccessType access_type)
{
ppcemb_tlb_t *tlb;
int i, ret, zsel, zpr, pr;
ret = -1;
pr = FIELD_EX64(env->msr, MSR, PR);
for (i = 0; i < env->nb_tlb; i++) {
tlb = &env->tlb.tlbe[i];
if (!ppcemb_tlb_check(env, tlb, raddr, address,
env->spr[SPR_40x_PID], i)) {
continue;
}
zsel = (tlb->attr >> 4) & 0xF;
zpr = (env->spr[SPR_40x_ZPR] >> (30 - (2 * zsel))) & 0x3;
qemu_log_mask(CPU_LOG_MMU,
"%s: TLB %d zsel %d zpr %d ty %d attr %08x\n",
__func__, i, zsel, zpr, access_type, tlb->attr);
/* Check execute enable bit */
switch (zpr) {
case 0x2:
if (pr != 0) {
goto check_perms;
}
/* fall through */
case 0x3:
/* All accesses granted */
*prot = PAGE_RWX;
ret = 0;
break;
case 0x0:
if (pr != 0) {
/* Raise Zone protection fault. */
env->spr[SPR_40x_ESR] = 1 << 22;
*prot = 0;
ret = -2;
break;
}
/* fall through */
case 0x1:
check_perms:
/* Check from TLB entry */
*prot = tlb->prot;
if (check_prot_access_type(*prot, access_type)) {
ret = 0;
} else {
env->spr[SPR_40x_ESR] = 0;
ret = -2;
}
break;
}
}
qemu_log_mask(CPU_LOG_MMU, "%s: access %s " TARGET_FMT_lx " => "
HWADDR_FMT_plx " %d %d\n", __func__,
ret < 0 ? "refused" : "granted", address,
ret < 0 ? 0 : *raddr, *prot, ret);
return ret;
}
static bool mmubooke_check_pid(CPUPPCState *env, ppcemb_tlb_t *tlb,
hwaddr *raddr, target_ulong addr, int i)
{
if (ppcemb_tlb_check(env, tlb, raddr, addr, env->spr[SPR_BOOKE_PID], i)) {
if (!env->nb_pids) {
/* Extend the physical address to 36 bits */
*raddr |= (uint64_t)(tlb->RPN & 0xF) << 32;
}
return true;
} else if (!env->nb_pids) {
return false;
}
if (env->spr[SPR_BOOKE_PID1] &&
ppcemb_tlb_check(env, tlb, raddr, addr, env->spr[SPR_BOOKE_PID1], i)) {
return true;
}
if (env->spr[SPR_BOOKE_PID2] &&
ppcemb_tlb_check(env, tlb, raddr, addr, env->spr[SPR_BOOKE_PID2], i)) {
return true;
}
return false;
}
static int mmubooke_check_tlb(CPUPPCState *env, ppcemb_tlb_t *tlb,
hwaddr *raddr, int *prot, target_ulong address,
MMUAccessType access_type, int i)
{
if (!mmubooke_check_pid(env, tlb, raddr, address, i)) {
qemu_log_mask(CPU_LOG_MMU, "%s: TLB entry not found\n", __func__);
return -1;
}
/* Check the address space */
if ((access_type == MMU_INST_FETCH ?
FIELD_EX64(env->msr, MSR, IR) :
FIELD_EX64(env->msr, MSR, DR)) != (tlb->attr & 1)) {
qemu_log_mask(CPU_LOG_MMU, "%s: AS doesn't match\n", __func__);
return -1;
}
if (FIELD_EX64(env->msr, MSR, PR)) {
*prot = tlb->prot & 0xF;
} else {
*prot = (tlb->prot >> 4) & 0xF;
}
if (check_prot_access_type(*prot, access_type)) {
qemu_log_mask(CPU_LOG_MMU, "%s: good TLB!\n", __func__);
return 0;
}
qemu_log_mask(CPU_LOG_MMU, "%s: no prot match: %x\n", __func__, *prot);
return access_type == MMU_INST_FETCH ? -3 : -2;
}
static int mmubooke_get_physical_address(CPUPPCState *env, hwaddr *raddr,
int *prot, target_ulong address,
MMUAccessType access_type)
{
ppcemb_tlb_t *tlb;
int i, ret = -1;
for (i = 0; i < env->nb_tlb; i++) {
tlb = &env->tlb.tlbe[i];
ret = mmubooke_check_tlb(env, tlb, raddr, prot, address,
access_type, i);
if (ret != -1) {
break;
}
}
qemu_log_mask(CPU_LOG_MMU,
"%s: access %s " TARGET_FMT_lx " => " HWADDR_FMT_plx
" %d %d\n", __func__, ret < 0 ? "refused" : "granted",
address, ret < 0 ? -1 : *raddr, ret == -1 ? 0 : *prot, ret);
return ret;
}
hwaddr booke206_tlb_to_page_size(CPUPPCState *env, ppcmas_tlb_t *tlb)
{
int tlbm_size;
tlbm_size = (tlb->mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
return 1024ULL << tlbm_size;
}
/* TLB check function for MAS based SoftTLBs */
int ppcmas_tlb_check(CPUPPCState *env, ppcmas_tlb_t *tlb, hwaddr *raddrp,
target_ulong address, uint32_t pid)
{
hwaddr mask;
uint32_t tlb_pid;
if (!FIELD_EX64(env->msr, MSR, CM)) {
/* In 32bit mode we can only address 32bit EAs */
address = (uint32_t)address;
}
/* Check valid flag */
if (!(tlb->mas1 & MAS1_VALID)) {
return -1;
}
mask = ~(booke206_tlb_to_page_size(env, tlb) - 1);
qemu_log_mask(CPU_LOG_MMU, "%s: TLB ADDR=0x" TARGET_FMT_lx
" PID=0x%x MAS1=0x%x MAS2=0x%" PRIx64 " mask=0x%"
HWADDR_PRIx " MAS7_3=0x%" PRIx64 " MAS8=0x%" PRIx32 "\n",
__func__, address, pid, tlb->mas1, tlb->mas2, mask,
tlb->mas7_3, tlb->mas8);
/* Check PID */
tlb_pid = (tlb->mas1 & MAS1_TID_MASK) >> MAS1_TID_SHIFT;
if (tlb_pid != 0 && tlb_pid != pid) {
return -1;
}
/* Check effective address */
if ((address & mask) != (tlb->mas2 & MAS2_EPN_MASK)) {
return -1;
}
if (raddrp) {
*raddrp = (tlb->mas7_3 & mask) | (address & ~mask);
}
return 0;
}
static bool is_epid_mmu(int mmu_idx)
{
return mmu_idx == PPC_TLB_EPID_STORE || mmu_idx == PPC_TLB_EPID_LOAD;
}
static uint32_t mmubooke206_esr(int mmu_idx, MMUAccessType access_type)
{
uint32_t esr = 0;
if (access_type == MMU_DATA_STORE) {
esr |= ESR_ST;
}
if (is_epid_mmu(mmu_idx)) {
esr |= ESR_EPID;
}
return esr;
}
/*
* Get EPID register given the mmu_idx. If this is regular load,
* construct the EPID access bits from current processor state
*
* Get the effective AS and PR bits and the PID. The PID is returned
* only if EPID load is requested, otherwise the caller must detect
* the correct EPID. Return true if valid EPID is returned.
*/
static bool mmubooke206_get_as(CPUPPCState *env,
int mmu_idx, uint32_t *epid_out,
bool *as_out, bool *pr_out)
{
if (is_epid_mmu(mmu_idx)) {
uint32_t epidr;
if (mmu_idx == PPC_TLB_EPID_STORE) {
epidr = env->spr[SPR_BOOKE_EPSC];
} else {
epidr = env->spr[SPR_BOOKE_EPLC];
}
*epid_out = (epidr & EPID_EPID) >> EPID_EPID_SHIFT;
*as_out = !!(epidr & EPID_EAS);
*pr_out = !!(epidr & EPID_EPR);
return true;
} else {
*as_out = FIELD_EX64(env->msr, MSR, DS);
*pr_out = FIELD_EX64(env->msr, MSR, PR);
return false;
}
}
/* Check if the tlb found by hashing really matches */
static int mmubooke206_check_tlb(CPUPPCState *env, ppcmas_tlb_t *tlb,
hwaddr *raddr, int *prot,
target_ulong address,
MMUAccessType access_type, int mmu_idx)
{
uint32_t epid;
bool as, pr;
bool use_epid = mmubooke206_get_as(env, mmu_idx, &epid, &as, &pr);
if (!use_epid) {
if (ppcmas_tlb_check(env, tlb, raddr, address,
env->spr[SPR_BOOKE_PID]) >= 0) {
goto found_tlb;
}
if (env->spr[SPR_BOOKE_PID1] &&
ppcmas_tlb_check(env, tlb, raddr, address,
env->spr[SPR_BOOKE_PID1]) >= 0) {
goto found_tlb;
}
if (env->spr[SPR_BOOKE_PID2] &&
ppcmas_tlb_check(env, tlb, raddr, address,
env->spr[SPR_BOOKE_PID2]) >= 0) {
goto found_tlb;
}
} else {
if (ppcmas_tlb_check(env, tlb, raddr, address, epid) >= 0) {
goto found_tlb;
}
}
qemu_log_mask(CPU_LOG_MMU, "%s: No TLB entry found for effective address "
"0x" TARGET_FMT_lx "\n", __func__, address);
return -1;
found_tlb:
/* Check the address space and permissions */
if (access_type == MMU_INST_FETCH) {
/* There is no way to fetch code using epid load */
assert(!use_epid);
as = FIELD_EX64(env->msr, MSR, IR);
}
if (as != ((tlb->mas1 & MAS1_TS) >> MAS1_TS_SHIFT)) {
qemu_log_mask(CPU_LOG_MMU, "%s: AS doesn't match\n", __func__);
return -1;
}
*prot = 0;
if (pr) {
if (tlb->mas7_3 & MAS3_UR) {
*prot |= PAGE_READ;
}
if (tlb->mas7_3 & MAS3_UW) {
*prot |= PAGE_WRITE;
}
if (tlb->mas7_3 & MAS3_UX) {
*prot |= PAGE_EXEC;
}
} else {
if (tlb->mas7_3 & MAS3_SR) {
*prot |= PAGE_READ;
}
if (tlb->mas7_3 & MAS3_SW) {
*prot |= PAGE_WRITE;
}
if (tlb->mas7_3 & MAS3_SX) {
*prot |= PAGE_EXEC;
}
}
if (check_prot_access_type(*prot, access_type)) {
qemu_log_mask(CPU_LOG_MMU, "%s: good TLB!\n", __func__);
return 0;
}
qemu_log_mask(CPU_LOG_MMU, "%s: no prot match: %x\n", __func__, *prot);
return access_type == MMU_INST_FETCH ? -3 : -2;
}
static int mmubooke206_get_physical_address(CPUPPCState *env, hwaddr *raddr,
int *prot, target_ulong address,
MMUAccessType access_type,
int mmu_idx)
{
ppcmas_tlb_t *tlb;
int i, j, ret = -1;
for (i = 0; i < BOOKE206_MAX_TLBN; i++) {
int ways = booke206_tlb_ways(env, i);
for (j = 0; j < ways; j++) {
tlb = booke206_get_tlbm(env, i, address, j);
if (!tlb) {
continue;
}
ret = mmubooke206_check_tlb(env, tlb, raddr, prot, address,
access_type, mmu_idx);
if (ret != -1) {
goto found_tlb;
}
}
}
found_tlb:
qemu_log_mask(CPU_LOG_MMU, "%s: access %s " TARGET_FMT_lx " => "
HWADDR_FMT_plx " %d %d\n", __func__,
ret < 0 ? "refused" : "granted", address,
ret < 0 ? -1 : *raddr, ret == -1 ? 0 : *prot, ret);
return ret;
}
static void booke206_update_mas_tlb_miss(CPUPPCState *env, target_ulong address,
MMUAccessType access_type, int mmu_idx)
{
uint32_t epid;
bool as, pr;
uint32_t missed_tid = 0;
bool use_epid = mmubooke206_get_as(env, mmu_idx, &epid, &as, &pr);
if (access_type == MMU_INST_FETCH) {
as = FIELD_EX64(env->msr, MSR, IR);
}
env->spr[SPR_BOOKE_MAS0] = env->spr[SPR_BOOKE_MAS4] & MAS4_TLBSELD_MASK;
env->spr[SPR_BOOKE_MAS1] = env->spr[SPR_BOOKE_MAS4] & MAS4_TSIZED_MASK;
env->spr[SPR_BOOKE_MAS2] = env->spr[SPR_BOOKE_MAS4] & MAS4_WIMGED_MASK;
env->spr[SPR_BOOKE_MAS3] = 0;
env->spr[SPR_BOOKE_MAS6] = 0;
env->spr[SPR_BOOKE_MAS7] = 0;
/* AS */
if (as) {
env->spr[SPR_BOOKE_MAS1] |= MAS1_TS;
env->spr[SPR_BOOKE_MAS6] |= MAS6_SAS;
}
env->spr[SPR_BOOKE_MAS1] |= MAS1_VALID;
env->spr[SPR_BOOKE_MAS2] |= address & MAS2_EPN_MASK;
if (!use_epid) {
switch (env->spr[SPR_BOOKE_MAS4] & MAS4_TIDSELD_PIDZ) {
case MAS4_TIDSELD_PID0:
missed_tid = env->spr[SPR_BOOKE_PID];
break;
case MAS4_TIDSELD_PID1:
missed_tid = env->spr[SPR_BOOKE_PID1];
break;
case MAS4_TIDSELD_PID2:
missed_tid = env->spr[SPR_BOOKE_PID2];
break;
}
env->spr[SPR_BOOKE_MAS6] |= env->spr[SPR_BOOKE_PID] << 16;
} else {
missed_tid = epid;
env->spr[SPR_BOOKE_MAS6] |= missed_tid << 16;
}
env->spr[SPR_BOOKE_MAS1] |= (missed_tid << MAS1_TID_SHIFT);
/* next victim logic */
env->spr[SPR_BOOKE_MAS0] |= env->last_way << MAS0_ESEL_SHIFT;
env->last_way++;
env->last_way &= booke206_tlb_ways(env, 0) - 1;
env->spr[SPR_BOOKE_MAS0] |= env->last_way << MAS0_NV_SHIFT;
}
bool ppc_booke_xlate(PowerPCCPU *cpu, vaddr eaddr, MMUAccessType access_type,
hwaddr *raddrp, int *psizep, int *protp, int mmu_idx,
bool guest_visible)
{
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
hwaddr raddr;
int prot, ret;
if (env->mmu_model == POWERPC_MMU_BOOKE206) {
ret = mmubooke206_get_physical_address(env, &raddr, &prot, eaddr,
access_type, mmu_idx);
} else {
ret = mmubooke_get_physical_address(env, &raddr, &prot, eaddr,
access_type);
}
if (ret == 0) {
*raddrp = raddr;
*protp = prot;
*psizep = TARGET_PAGE_BITS;
return true;
} else if (!guest_visible) {
return false;
}
log_cpu_state_mask(CPU_LOG_MMU, cs, 0);
env->error_code = 0;
switch (ret) {
case -1:
/* No matches in page tables or TLB */
if (env->mmu_model == POWERPC_MMU_BOOKE206) {
booke206_update_mas_tlb_miss(env, eaddr, access_type, mmu_idx);
}
cs->exception_index = (access_type == MMU_INST_FETCH) ?
POWERPC_EXCP_ITLB : POWERPC_EXCP_DTLB;
env->spr[SPR_BOOKE_DEAR] = eaddr;
env->spr[SPR_BOOKE_ESR] = mmubooke206_esr(mmu_idx, access_type);
break;
case -2:
/* Access rights violation */
cs->exception_index = (access_type == MMU_INST_FETCH) ?
POWERPC_EXCP_ISI : POWERPC_EXCP_DSI;
if (access_type != MMU_INST_FETCH) {
env->spr[SPR_BOOKE_DEAR] = eaddr;
env->spr[SPR_BOOKE_ESR] = mmubooke206_esr(mmu_idx, access_type);
}
break;
case -3:
/* No execute protection violation */
cs->exception_index = POWERPC_EXCP_ISI;
env->spr[SPR_BOOKE_ESR] = 0;
break;
}
return false;
}
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