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target-arm: Implement PMSAv7 MPU 

Unified MPU only. Uses ARM architecture major revision to switch
between PMSAv5 and v7 when ARM_FEATURE_MPU is set. PMSA v6 remains
unsupported and is asserted against.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: dcb03cda6dd754c5cc6a962fa11f25089811e954.1434501320.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Crosthwaite 2015-06-19 14:17:45 +01:00 committed by Peter Maydell
parent 6cb0b013a1
commit f6bda88ff8
2 changed files with 174 additions and 1 deletions
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1
target-arm/cpu.h
View File

@ -560,6 +560,7 @@ void pmccntr_sync(CPUARMState *env);
#define SCTLR_DT (1U << 16) /* up to ??, RAO in v6 and v7 */
#define SCTLR_nTWI (1U << 16) /* v8 onward */
#define SCTLR_HA (1U << 17)
#define SCTLR_BR (1U << 17) /* PMSA only */
#define SCTLR_IT (1U << 18) /* up to ??, RAO in v6 and v7 */
#define SCTLR_nTWE (1U << 18) /* v8 onward */
#define SCTLR_WXN (1U << 19)

174
target-arm/helper.c
View File

@ -5835,6 +5835,167 @@ do_fault:
return true;
}
static inline void get_phys_addr_pmsav7_default(CPUARMState *env,
ARMMMUIdx mmu_idx,
int32_t address, int *prot)
{
*prot = PAGE_READ | PAGE_WRITE;
switch (address) {
case 0xF0000000 ... 0xFFFFFFFF:
if (regime_sctlr(env, mmu_idx) & SCTLR_V) { /* hivecs execing is ok */
*prot |= PAGE_EXEC;
}
break;
case 0x00000000 ... 0x7FFFFFFF:
*prot |= PAGE_EXEC;
break;
}
}
static bool get_phys_addr_pmsav7(CPUARMState *env, uint32_t address,
int access_type, ARMMMUIdx mmu_idx,
hwaddr *phys_ptr, int *prot, uint32_t *fsr)
{
ARMCPU *cpu = arm_env_get_cpu(env);
int n;
bool is_user = regime_is_user(env, mmu_idx);
*phys_ptr = address;
*prot = 0;
if (regime_translation_disabled(env, mmu_idx)) { /* MPU disabled */
get_phys_addr_pmsav7_default(env, mmu_idx, address, prot);
} else { /* MPU enabled */
for (n = (int)cpu->pmsav7_dregion - 1; n >= 0; n--) {
/* region search */
uint32_t base = env->pmsav7.drbar[n];
uint32_t rsize = extract32(env->pmsav7.drsr[n], 1, 5);
uint32_t rmask;
bool srdis = false;
if (!(env->pmsav7.drsr[n] & 0x1)) {
continue;
}
if (!rsize) {
qemu_log_mask(LOG_GUEST_ERROR, "DRSR.Rsize field can not be 0");
continue;
}
rsize++;
rmask = (1ull << rsize) - 1;
if (base & rmask) {
qemu_log_mask(LOG_GUEST_ERROR, "DRBAR %" PRIx32 " misaligned "
"to DRSR region size, mask = %" PRIx32,
base, rmask);
continue;
}
if (address < base || address > base + rmask) {
continue;
}
/* Region matched */
if (rsize >= 8) { /* no subregions for regions < 256 bytes */
int i, snd;
uint32_t srdis_mask;
rsize -= 3; /* sub region size (power of 2) */
snd = ((address - base) >> rsize) & 0x7;
srdis = extract32(env->pmsav7.drsr[n], snd + 8, 1);
srdis_mask = srdis ? 0x3 : 0x0;
for (i = 2; i <= 8 && rsize < TARGET_PAGE_BITS; i *= 2) {
/* This will check in groups of 2, 4 and then 8, whether
* the subregion bits are consistent. rsize is incremented
* back up to give the region size, considering consistent
* adjacent subregions as one region. Stop testing if rsize
* is already big enough for an entire QEMU page.
*/
int snd_rounded = snd & ~(i - 1);
uint32_t srdis_multi = extract32(env->pmsav7.drsr[n],
snd_rounded + 8, i);
if (srdis_mask ^ srdis_multi) {
break;
}
srdis_mask = (srdis_mask << i) | srdis_mask;
rsize++;
}
}
if (rsize < TARGET_PAGE_BITS) {
qemu_log_mask(LOG_UNIMP, "No support for MPU (sub)region"
"alignment of %" PRIu32 " bits. Minimum is %d\n",
rsize, TARGET_PAGE_BITS);
continue;
}
if (srdis) {
continue;
}
break;
}
if (n == -1) { /* no hits */
if (cpu->pmsav7_dregion &&
(is_user || !(regime_sctlr(env, mmu_idx) & SCTLR_BR))) {
/* background fault */
*fsr = 0;
return true;
}
get_phys_addr_pmsav7_default(env, mmu_idx, address, prot);
} else { /* a MPU hit! */
uint32_t ap = extract32(env->pmsav7.dracr[n], 8, 3);
if (is_user) { /* User mode AP bit decoding */
switch (ap) {
case 0:
case 1:
case 5:
break; /* no access */
case 3:
*prot |= PAGE_WRITE;
/* fall through */
case 2:
case 6:
*prot |= PAGE_READ | PAGE_EXEC;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"Bad value for AP bits in DRACR %"
PRIx32 "\n", ap);
}
} else { /* Priv. mode AP bits decoding */
switch (ap) {
case 0:
break; /* no access */
case 1:
case 2:
case 3:
*prot |= PAGE_WRITE;
/* fall through */
case 5:
case 6:
*prot |= PAGE_READ | PAGE_EXEC;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"Bad value for AP bits in DRACR %"
PRIx32 "\n", ap);
}
}
/* execute never */
if (env->pmsav7.dracr[n] & (1 << 12)) {
*prot &= ~PAGE_EXEC;
}
}
}
*fsr = 0x00d; /* Permission fault */
return !(*prot & (1 << access_type));
}
static bool get_phys_addr_pmsav5(CPUARMState *env, uint32_t address,
int access_type, ARMMMUIdx mmu_idx,
hwaddr *phys_ptr, int *prot, uint32_t *fsr)
@ -5920,7 +6081,7 @@ static bool get_phys_addr_pmsav5(CPUARMState *env, uint32_t address,
* DFSR/IFSR fault register, with the following caveats:
* * we honour the short vs long DFSR format differences.
* * the WnR bit is never set (the caller must do this).
* * for MPU based systems we don't bother to return a full FSR format
* * for PSMAv5 based systems we don't bother to return a full FSR format
* value.
*
* @env: CPUARMState
@ -5968,6 +6129,16 @@ static inline bool get_phys_addr(CPUARMState *env, target_ulong address,
}
}
/* pmsav7 has special handling for when MPU is disabled so call it before
* the common MMU/MPU disabled check below.
*/
if (arm_feature(env, ARM_FEATURE_MPU) &&
arm_feature(env, ARM_FEATURE_V7)) {
*page_size = TARGET_PAGE_SIZE;
return get_phys_addr_pmsav7(env, address, access_type, mmu_idx,
phys_ptr, prot, fsr);
}
if (regime_translation_disabled(env, mmu_idx)) {
/* MMU/MPU disabled. */
*phys_ptr = address;
@ -5977,6 +6148,7 @@ static inline bool get_phys_addr(CPUARMState *env, target_ulong address,
}
if (arm_feature(env, ARM_FEATURE_MPU)) {
/* Pre-v7 MPU */
*page_size = TARGET_PAGE_SIZE;
return get_phys_addr_pmsav5(env, address, access_type, mmu_idx,
phys_ptr, prot, fsr);