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target/arm: Remove is_subpage argument to pmsav8_mpu_lookup 

This can be made redundant with result->page_size, by moving the basic
set of page_size from get_phys_addr_pmsav8.  We still need to overwrite
page_size when v8m_security_lookup signals a subpage.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220822152741.1617527-11-richard.henderson@linaro.org
[PMM: Update a comment that used to refer to is_subpage]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2022-08-22 08:26:45 -07:00 committed by Peter Maydell
parent d2c92e5856
commit 652c750ee5
3 changed files with 15 additions and 15 deletions
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4
target/arm/internals.h
View File

@ -1152,8 +1152,8 @@ bool get_phys_addr(CPUARMState *env, target_ulong address,
bool pmsav8_mpu_lookup(CPUARMState *env, uint32_t address,
MMUAccessType access_type, ARMMMUIdx mmu_idx,
GetPhysAddrResult *result, bool *is_subpage,
ARMMMUFaultInfo *fi, uint32_t *mregion);
GetPhysAddrResult *result, ARMMMUFaultInfo *fi,
uint32_t *mregion);
void arm_log_exception(CPUState *cs);

3
target/arm/m_helper.c
View File

@ -2806,11 +2806,10 @@ uint32_t HELPER(v7m_tt)(CPUARMState *env, uint32_t addr, uint32_t op)
if (arm_current_el(env) != 0 || alt) {
GetPhysAddrResult res = {};
ARMMMUFaultInfo fi = {};
bool is_subpage;
/* We can ignore the return value as prot is always set */
pmsav8_mpu_lookup(env, addr, MMU_DATA_LOAD, mmu_idx,
&res, &is_subpage, &fi, &mregion);
&res, &fi, &mregion);
if (mregion == -1) {
mrvalid = false;
mregion = 0;

23
target/arm/ptw.c
View File

@ -1701,8 +1701,8 @@ static bool get_phys_addr_pmsav7(CPUARMState *env, uint32_t address,
bool pmsav8_mpu_lookup(CPUARMState *env, uint32_t address,
MMUAccessType access_type, ARMMMUIdx mmu_idx,
GetPhysAddrResult *result, bool *is_subpage,
ARMMMUFaultInfo *fi, uint32_t *mregion)
GetPhysAddrResult *result, ARMMMUFaultInfo *fi,
uint32_t *mregion)
{
/*
* Perform a PMSAv8 MPU lookup (without also doing the SAU check
@ -1710,8 +1710,9 @@ bool pmsav8_mpu_lookup(CPUARMState *env, uint32_t address,
* mregion is (if not NULL) set to the region number which matched,
* or -1 if no region number is returned (MPU off, address did not
* hit a region, address hit in multiple regions).
* We set is_subpage to true if the region hit doesn't cover the
* entire TARGET_PAGE the address is within.
* If the region hit doesn't cover the entire TARGET_PAGE the address
* is within, then we set the result page_size to 1 to force the
* memory system to use a subpage.
*/
ARMCPU *cpu = env_archcpu(env);
bool is_user = regime_is_user(env, mmu_idx);
@ -1722,7 +1723,7 @@ bool pmsav8_mpu_lookup(CPUARMState *env, uint32_t address,
uint32_t addr_page_base = address & TARGET_PAGE_MASK;
uint32_t addr_page_limit = addr_page_base + (TARGET_PAGE_SIZE - 1);
*is_subpage = false;
result->page_size = TARGET_PAGE_SIZE;
result->phys = address;
result->prot = 0;
if (mregion) {
@ -1774,13 +1775,13 @@ bool pmsav8_mpu_lookup(CPUARMState *env, uint32_t address,
ranges_overlap(base, limit - base + 1,
addr_page_base,
TARGET_PAGE_SIZE)) {
*is_subpage = true;
result->page_size = 1;
}
continue;
}
if (base > addr_page_base || limit < addr_page_limit) {
*is_subpage = true;
result->page_size = 1;
}
if (matchregion != -1) {
@ -1972,7 +1973,6 @@ static bool get_phys_addr_pmsav8(CPUARMState *env, uint32_t address,
uint32_t secure = regime_is_secure(env, mmu_idx);
V8M_SAttributes sattrs = {};
bool ret;
bool mpu_is_subpage;
if (arm_feature(env, ARM_FEATURE_M_SECURITY)) {
v8m_security_lookup(env, address, access_type, mmu_idx, &sattrs);
@ -2035,9 +2035,10 @@ static bool get_phys_addr_pmsav8(CPUARMState *env, uint32_t address,
}
ret = pmsav8_mpu_lookup(env, address, access_type, mmu_idx,
result, &mpu_is_subpage, fi, NULL);
result->page_size =
sattrs.subpage || mpu_is_subpage ? 1 : TARGET_PAGE_SIZE;
result, fi, NULL);
if (sattrs.subpage) {
result->page_size = 1;
}
return ret;
}