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91cda45b69
qemu-e2k/target-ppc/mmu-hash64.c
David Gibson 91cda45b69 mmu-hash*: Reduce use of access_type 
In ppc env->access_type is updated by e.g. integer load/stores with
ACCESS_INT floating point load/stores with ACCESS_FLOAT and so forth.  In
hash mmu fault paths it can also b set to ACCESS_CODE for instruction
fetch accesses.

But the only place which uses anything more of the access_type than
whether it is instruction fetch or data access is the direct store segment
handling.  Instruction versus data access can be more simply determined
from the rw value passed down from the top.

This changes the code to use rw in preference to checking access_type.
For the 32-bit case there is a small amount of code (for direct store
segments) that still needs the full access type.  Instead of passing it
all the way down the stack, we retrieve it from the env structure, which
is where it came anyway, before this patch.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-03-22 15:28:49 +01:00

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/*
* PowerPC MMU, TLB, SLB and BAT emulation helpers for QEMU.
*
* Copyright (c) 2003-2007 Jocelyn Mayer
* Copyright (c) 2013 David Gibson, IBM Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "cpu.h"
#include "helper.h"
#include "sysemu/kvm.h"
#include "kvm_ppc.h"
#include "mmu-hash64.h"
//#define DEBUG_MMU
//#define DEBUG_SLB
#ifdef DEBUG_MMU
# define LOG_MMU(...) qemu_log(__VA_ARGS__)
# define LOG_MMU_STATE(env) log_cpu_state((env), 0)
#else
# define LOG_MMU(...) do { } while (0)
# define LOG_MMU_STATE(...) do { } while (0)
#endif
#ifdef DEBUG_SLB
# define LOG_SLB(...) qemu_log(__VA_ARGS__)
#else
# define LOG_SLB(...) do { } while (0)
#endif
struct mmu_ctx_hash64 {
hwaddr raddr; /* Real address */
hwaddr eaddr; /* Effective address */
int prot; /* Protection bits */
hwaddr hash[2]; /* Pagetable hash values */
target_ulong ptem; /* Virtual segment ID | API */
int key; /* Access key */
int nx; /* Non-execute area */
};
/*
* SLB handling
*/
static ppc_slb_t *slb_lookup(CPUPPCState *env, target_ulong eaddr)
{
uint64_t esid_256M, esid_1T;
int n;
LOG_SLB("%s: eaddr " TARGET_FMT_lx "\n", __func__, eaddr);
esid_256M = (eaddr & SEGMENT_MASK_256M) | SLB_ESID_V;
esid_1T = (eaddr & SEGMENT_MASK_1T) | SLB_ESID_V;
for (n = 0; n < env->slb_nr; n++) {
ppc_slb_t *slb = &env->slb[n];
LOG_SLB("%s: slot %d %016" PRIx64 " %016"
PRIx64 "\n", __func__, n, slb->esid, slb->vsid);
/* We check for 1T matches on all MMUs here - if the MMU
* doesn't have 1T segment support, we will have prevented 1T
* entries from being inserted in the slbmte code. */
if (((slb->esid == esid_256M) &&
((slb->vsid & SLB_VSID_B) == SLB_VSID_B_256M))
|| ((slb->esid == esid_1T) &&
((slb->vsid & SLB_VSID_B) == SLB_VSID_B_1T))) {
return slb;
}
}
return NULL;
}
void dump_slb(FILE *f, fprintf_function cpu_fprintf, CPUPPCState *env)
{
int i;
uint64_t slbe, slbv;
cpu_synchronize_state(env);
cpu_fprintf(f, "SLB\tESID\t\t\tVSID\n");
for (i = 0; i < env->slb_nr; i++) {
slbe = env->slb[i].esid;
slbv = env->slb[i].vsid;
if (slbe == 0 && slbv == 0) {
continue;
}
cpu_fprintf(f, "%d\t0x%016" PRIx64 "\t0x%016" PRIx64 "\n",
i, slbe, slbv);
}
}
void helper_slbia(CPUPPCState *env)
{
int n, do_invalidate;
do_invalidate = 0;
/* XXX: Warning: slbia never invalidates the first segment */
for (n = 1; n < env->slb_nr; n++) {
ppc_slb_t *slb = &env->slb[n];
if (slb->esid & SLB_ESID_V) {
slb->esid &= ~SLB_ESID_V;
/* XXX: given the fact that segment size is 256 MB or 1TB,
* and we still don't have a tlb_flush_mask(env, n, mask)
* in QEMU, we just invalidate all TLBs
*/
do_invalidate = 1;
}
}
if (do_invalidate) {
tlb_flush(env, 1);
}
}
void helper_slbie(CPUPPCState *env, target_ulong addr)
{
ppc_slb_t *slb;
slb = slb_lookup(env, addr);
if (!slb) {
return;
}
if (slb->esid & SLB_ESID_V) {
slb->esid &= ~SLB_ESID_V;
/* XXX: given the fact that segment size is 256 MB or 1TB,
* and we still don't have a tlb_flush_mask(env, n, mask)
* in QEMU, we just invalidate all TLBs
*/
tlb_flush(env, 1);
}
}
int ppc_store_slb(CPUPPCState *env, target_ulong rb, target_ulong rs)
{
int slot = rb & 0xfff;
ppc_slb_t *slb = &env->slb[slot];
if (rb & (0x1000 - env->slb_nr)) {
return -1; /* Reserved bits set or slot too high */
}
if (rs & (SLB_VSID_B & ~SLB_VSID_B_1T)) {
return -1; /* Bad segment size */
}
if ((rs & SLB_VSID_B) && !(env->mmu_model & POWERPC_MMU_1TSEG)) {
return -1; /* 1T segment on MMU that doesn't support it */
}
/* Mask out the slot number as we store the entry */
slb->esid = rb & (SLB_ESID_ESID | SLB_ESID_V);
slb->vsid = rs;
LOG_SLB("%s: %d " TARGET_FMT_lx " - " TARGET_FMT_lx " => %016" PRIx64
" %016" PRIx64 "\n", __func__, slot, rb, rs,
slb->esid, slb->vsid);
return 0;
}
static int ppc_load_slb_esid(CPUPPCState *env, target_ulong rb,
target_ulong *rt)
{
int slot = rb & 0xfff;
ppc_slb_t *slb = &env->slb[slot];
if (slot >= env->slb_nr) {
return -1;
}
*rt = slb->esid;
return 0;
}
static int ppc_load_slb_vsid(CPUPPCState *env, target_ulong rb,
target_ulong *rt)
{
int slot = rb & 0xfff;
ppc_slb_t *slb = &env->slb[slot];
if (slot >= env->slb_nr) {
return -1;
}
*rt = slb->vsid;
return 0;
}
void helper_store_slb(CPUPPCState *env, target_ulong rb, target_ulong rs)
{
if (ppc_store_slb(env, rb, rs) < 0) {
helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
POWERPC_EXCP_INVAL);
}
}
target_ulong helper_load_slb_esid(CPUPPCState *env, target_ulong rb)
{
target_ulong rt = 0;
if (ppc_load_slb_esid(env, rb, &rt) < 0) {
helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
POWERPC_EXCP_INVAL);
}
return rt;
}
target_ulong helper_load_slb_vsid(CPUPPCState *env, target_ulong rb)
{
target_ulong rt = 0;
if (ppc_load_slb_vsid(env, rb, &rt) < 0) {
helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
POWERPC_EXCP_INVAL);
}
return rt;
}
/*
* 64-bit hash table MMU handling
*/
#define PTE64_CHECK_MASK (TARGET_PAGE_MASK | 0x7F)
static int ppc_hash64_pp_check(int key, int pp, int nx)
{
int access;
/* Compute access rights */
/* When pp is 4, 5 or 7, the result is undefined. Set it to noaccess */
access = 0;
if (key == 0) {
switch (pp) {
case 0x0:
case 0x1:
case 0x2:
access |= PAGE_WRITE;
/* No break here */
case 0x3:
case 0x6:
access |= PAGE_READ;
break;
}
} else {
switch (pp) {
case 0x0:
case 0x6:
access = 0;
break;
case 0x1:
case 0x3:
access = PAGE_READ;
break;
case 0x2:
access = PAGE_READ | PAGE_WRITE;
break;
}
}
if (nx == 0) {
access |= PAGE_EXEC;
}
return access;
}
static int ppc_hash64_check_prot(int prot, int rwx)
{
int ret;
if (rwx == 2) {
if (prot & PAGE_EXEC) {
ret = 0;
} else {
ret = -2;
}
} else if (rwx == 1) {
if (prot & PAGE_WRITE) {
ret = 0;
} else {
ret = -2;
}
} else {
if (prot & PAGE_READ) {
ret = 0;
} else {
ret = -2;
}
}
return ret;
}
static int pte64_check(struct mmu_ctx_hash64 *ctx, target_ulong pte0,
target_ulong pte1, int h, int rwx)
{
target_ulong mmask;
int access, ret, pp;
ret = -1;
/* Check validity and table match */
if ((pte0 & HPTE64_V_VALID) && (h == !!(pte0 & HPTE64_V_SECONDARY))) {
/* Check vsid & api */
mmask = PTE64_CHECK_MASK;
pp = (pte1 & HPTE64_R_PP) | ((pte1 & HPTE64_R_PP0) >> 61);
/* No execute if either noexec or guarded bits set */
ctx->nx = (pte1 & HPTE64_R_N) || (pte1 & HPTE64_R_G);
if (HPTE64_V_COMPARE(pte0, ctx->ptem)) {
if (ctx->raddr != (hwaddr)-1ULL) {
/* all matches should have equal RPN, WIMG & PP */
if ((ctx->raddr & mmask) != (pte1 & mmask)) {
qemu_log("Bad RPN/WIMG/PP\n");
return -3;
}
}
/* Compute access rights */
access = ppc_hash64_pp_check(ctx->key, pp, ctx->nx);
/* Keep the matching PTE informations */
ctx->raddr = pte1;
ctx->prot = access;
ret = ppc_hash64_check_prot(ctx->prot, rwx);
if (ret == 0) {
/* Access granted */
LOG_MMU("PTE access granted !\n");
} else {
/* Access right violation */
LOG_MMU("PTE access rejected\n");
}
}
}
return ret;
}
static int ppc_hash64_pte_update_flags(struct mmu_ctx_hash64 *ctx,
target_ulong *pte1p,
int ret, int rw)
{
int store = 0;
/* Update page flags */
if (!(*pte1p & HPTE64_R_R)) {
/* Update accessed flag */
*pte1p |= HPTE64_R_R;
store = 1;
}
if (!(*pte1p & HPTE64_R_C)) {
if (rw == 1 && ret == 0) {
/* Update changed flag */
*pte1p |= HPTE64_R_C;
store = 1;
} else {
/* Force page fault for first write access */
ctx->prot &= ~PAGE_WRITE;
}
}
return store;
}
/* PTE table lookup */
static int find_pte64(CPUPPCState *env, struct mmu_ctx_hash64 *ctx, int h,
int rwx, int target_page_bits)
{
hwaddr pteg_off;
target_ulong pte0, pte1;
int i, good = -1;
int ret, r;
ret = -1; /* No entry found */
pteg_off = (ctx->hash[h] * HASH_PTEG_SIZE_64) & env->htab_mask;
for (i = 0; i < HPTES_PER_GROUP; i++) {
pte0 = ppc_hash64_load_hpte0(env, pteg_off + i*HASH_PTE_SIZE_64);
pte1 = ppc_hash64_load_hpte1(env, pteg_off + i*HASH_PTE_SIZE_64);
r = pte64_check(ctx, pte0, pte1, h, rwx);
LOG_MMU("Load pte from %016" HWADDR_PRIx " => " TARGET_FMT_lx " "
TARGET_FMT_lx " %d %d %d " TARGET_FMT_lx "\n",
pteg_off + (i * 16), pte0, pte1, (int)(pte0 & 1), h,
(int)((pte0 >> 1) & 1), ctx->ptem);
switch (r) {
case -3:
/* PTE inconsistency */
return -1;
case -2:
/* Access violation */
ret = -2;
good = i;
break;
case -1:
default:
/* No PTE match */
break;
case 0:
/* access granted */
/* XXX: we should go on looping to check all PTEs consistency
* but if we can speed-up the whole thing as the
* result would be undefined if PTEs are not consistent.
*/
ret = 0;
good = i;
goto done;
}
}
if (good != -1) {
done:
LOG_MMU("found PTE at addr %08" HWADDR_PRIx " prot=%01x ret=%d\n",
ctx->raddr, ctx->prot, ret);
/* Update page flags */
pte1 = ctx->raddr;
if (ppc_hash64_pte_update_flags(ctx, &pte1, ret, rwx) == 1) {
ppc_hash64_store_hpte1(env, pteg_off + good * HASH_PTE_SIZE_64, pte1);
}
}
/* We have a TLB that saves 4K pages, so let's
* split a huge page to 4k chunks */
if (target_page_bits != TARGET_PAGE_BITS) {
ctx->raddr |= (ctx->eaddr & ((1 << target_page_bits) - 1))
& TARGET_PAGE_MASK;
}
return ret;
}
static int get_segment64(CPUPPCState *env, struct mmu_ctx_hash64 *ctx,
target_ulong eaddr, int rwx)
{
hwaddr hash;
target_ulong vsid;
int pr, target_page_bits;
int ret, ret2;
pr = msr_pr;
ctx->eaddr = eaddr;
ppc_slb_t *slb;
target_ulong pageaddr;
int segment_bits;
LOG_MMU("Check SLBs\n");
slb = slb_lookup(env, eaddr);
if (!slb) {
return -5;
}
if (slb->vsid & SLB_VSID_B) {
vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT_1T;
segment_bits = 40;
} else {
vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT;
segment_bits = 28;
}
target_page_bits = (slb->vsid & SLB_VSID_L)
? TARGET_PAGE_BITS_16M : TARGET_PAGE_BITS;
ctx->key = !!(pr ? (slb->vsid & SLB_VSID_KP)
: (slb->vsid & SLB_VSID_KS));
ctx->nx = !!(slb->vsid & SLB_VSID_N);
pageaddr = eaddr & ((1ULL << segment_bits)
- (1ULL << target_page_bits));
if (slb->vsid & SLB_VSID_B) {
hash = vsid ^ (vsid << 25) ^ (pageaddr >> target_page_bits);
} else {
hash = vsid ^ (pageaddr >> target_page_bits);
}
/* Only 5 bits of the page index are used in the AVPN */
ctx->ptem = (slb->vsid & SLB_VSID_PTEM) |
((pageaddr >> 16) & ((1ULL << segment_bits) - 0x80));
LOG_MMU("pte segment: key=%d nx %d vsid " TARGET_FMT_lx "\n",
ctx->key, ctx->nx, vsid);
ret = -1;
/* Check if instruction fetch is allowed, if needed */
if (rwx != 2 || ctx->nx == 0) {
/* Page address translation */
LOG_MMU("htab_base " TARGET_FMT_plx " htab_mask " TARGET_FMT_plx
" hash " TARGET_FMT_plx "\n",
env->htab_base, env->htab_mask, hash);
ctx->hash[0] = hash;
ctx->hash[1] = ~hash;
/* Initialize real address with an invalid value */
ctx->raddr = (hwaddr)-1ULL;
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, ctx->ptem,
ctx->hash[0]);
/* Primary table lookup */
ret = find_pte64(env, ctx, 0, rwx, target_page_bits);
if (ret < 0) {
/* Secondary table lookup */
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, ctx->ptem, ctx->hash[1]);
ret2 = find_pte64(env, ctx, 1, rwx, target_page_bits);
if (ret2 != -1) {
ret = ret2;
}
}
} else {
LOG_MMU("No access allowed\n");
ret = -3;
}
return ret;
}
static int ppc_hash64_get_physical_address(CPUPPCState *env,
struct mmu_ctx_hash64 *ctx,
target_ulong eaddr, int rwx)
{
bool real_mode = (rwx == 2 && msr_ir == 0)
|| (rwx != 2 && msr_dr == 0);
if (real_mode) {
ctx->raddr = eaddr & 0x0FFFFFFFFFFFFFFFULL;
ctx->prot = PAGE_READ | PAGE_EXEC | PAGE_WRITE;
return 0;
} else {
return get_segment64(env, ctx, eaddr, rwx);
}
}
hwaddr ppc_hash64_get_phys_page_debug(CPUPPCState *env, target_ulong addr)
{
struct mmu_ctx_hash64 ctx;
if (unlikely(ppc_hash64_get_physical_address(env, &ctx, addr, 0) != 0)) {
return -1;
}
return ctx.raddr & TARGET_PAGE_MASK;
}
int ppc_hash64_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rwx,
int mmu_idx)
{
struct mmu_ctx_hash64 ctx;
int ret = 0;
ret = ppc_hash64_get_physical_address(env, &ctx, address, rwx);
if (ret == 0) {
tlb_set_page(env, address & TARGET_PAGE_MASK,
ctx.raddr & TARGET_PAGE_MASK, ctx.prot,
mmu_idx, TARGET_PAGE_SIZE);
ret = 0;
} else if (ret < 0) {
LOG_MMU_STATE(env);
if (rwx == 2) {
switch (ret) {
case -1:
env->exception_index = POWERPC_EXCP_ISI;
env->error_code = 0x40000000;
break;
case -2:
/* Access rights violation */
env->exception_index = POWERPC_EXCP_ISI;
env->error_code = 0x08000000;
break;
case -3:
/* No execute protection violation */
env->exception_index = POWERPC_EXCP_ISI;
env->error_code = 0x10000000;
break;
case -5:
/* No match in segment table */
env->exception_index = POWERPC_EXCP_ISEG;
env->error_code = 0;
break;
}
} else {
switch (ret) {
case -1:
/* No matches in page tables or TLB */
env->exception_index = POWERPC_EXCP_DSI;
env->error_code = 0;
env->spr[SPR_DAR] = address;
if (rwx == 1) {
env->spr[SPR_DSISR] = 0x42000000;
} else {
env->spr[SPR_DSISR] = 0x40000000;
}
break;
case -2:
/* Access rights violation */
env->exception_index = POWERPC_EXCP_DSI;
env->error_code = 0;
env->spr[SPR_DAR] = address;
if (rwx == 1) {
env->spr[SPR_DSISR] = 0x0A000000;
} else {
env->spr[SPR_DSISR] = 0x08000000;
}
break;
case -5:
/* No match in segment table */
env->exception_index = POWERPC_EXCP_DSEG;
env->error_code = 0;
env->spr[SPR_DAR] = address;
break;
}
}
#if 0
printf("%s: set exception to %d %02x\n", __func__,
env->exception, env->error_code);
#endif
ret = 1;
}
return ret;
}
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