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arm: Use different ARMMMUIdx values for M profile

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Make M profile use completely separate ARMMMUIdx values from
those that A profile CPUs use. This is a prelude to adding
support for the MPU and for v8M, which together will require
6 MMU indexes which don't map cleanly onto the A profile
uses:
 non secure User
 non secure Privileged
 non secure Privileged, execution priority < 0
 secure User
 secure Privileged
 secure Privileged, execution priority < 0

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1493122030-32191-4-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2017-06-02 11:51:47 +01:00
parent 8bd5c82030
commit e7b921c2d9
3 changed files with 27 additions and 2 deletions
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21
target/arm/cpu.h
View File

@ -2057,8 +2057,9 @@ static inline bool arm_excp_unmasked(CPUState *cs, unsigned int excp_idx,
* of the AT/ATS operations.
* The values used are carefully arranged to make mmu_idx => EL lookup easy.
*/
#define ARM_MMU_IDX_A 0x10 /* A profile (and M profile, for the moment) */
#define ARM_MMU_IDX_A 0x10 /* A profile */
#define ARM_MMU_IDX_NOTLB 0x20 /* does not have a TLB */
#define ARM_MMU_IDX_M 0x40 /* M profile */
#define ARM_MMU_IDX_TYPE_MASK (~0x7)
#define ARM_MMU_IDX_COREIDX_MASK 0x7
@ -2071,6 +2072,8 @@ typedef enum ARMMMUIdx {
ARMMMUIdx_S1SE0 = 4 | ARM_MMU_IDX_A,
ARMMMUIdx_S1SE1 = 5 | ARM_MMU_IDX_A,
ARMMMUIdx_S2NS = 6 | ARM_MMU_IDX_A,
ARMMMUIdx_MUser = 0 | ARM_MMU_IDX_M,
ARMMMUIdx_MPriv = 1 | ARM_MMU_IDX_M,
/* Indexes below here don't have TLBs and are used only for AT system
* instructions or for the first stage of an S12 page table walk.
*/
@ -2089,6 +2092,8 @@ typedef enum ARMMMUIdxBit {
ARMMMUIdxBit_S1SE0 = 1 << 4,
ARMMMUIdxBit_S1SE1 = 1 << 5,
ARMMMUIdxBit_S2NS = 1 << 6,
ARMMMUIdxBit_MUser = 1 << 0,
ARMMMUIdxBit_MPriv = 1 << 1,
} ARMMMUIdxBit;
#define MMU_USER_IDX 0
@ -2100,7 +2105,11 @@ static inline int arm_to_core_mmu_idx(ARMMMUIdx mmu_idx)
static inline ARMMMUIdx core_to_arm_mmu_idx(CPUARMState *env, int mmu_idx)
{
return mmu_idx | ARM_MMU_IDX_A;
if (arm_feature(env, ARM_FEATURE_M)) {
return mmu_idx | ARM_MMU_IDX_M;
} else {
return mmu_idx | ARM_MMU_IDX_A;
}
}
/* Return the exception level we're running at if this is our mmu_idx */
@ -2109,6 +2118,8 @@ static inline int arm_mmu_idx_to_el(ARMMMUIdx mmu_idx)
switch (mmu_idx & ARM_MMU_IDX_TYPE_MASK) {
case ARM_MMU_IDX_A:
return mmu_idx & 3;
case ARM_MMU_IDX_M:
return mmu_idx & 1;
default:
g_assert_not_reached();
}
@ -2119,6 +2130,12 @@ static inline int cpu_mmu_index(CPUARMState *env, bool ifetch)
{
int el = arm_current_el(env);
if (arm_feature(env, ARM_FEATURE_M)) {
ARMMMUIdx mmu_idx = el == 0 ? ARMMMUIdx_MUser : ARMMMUIdx_MPriv;
return arm_to_core_mmu_idx(mmu_idx);
}
if (el < 2 && arm_is_secure_below_el3(env)) {
return arm_to_core_mmu_idx(ARMMMUIdx_S1SE0 + el);
}

5
target/arm/helper.c
View File

@ -6992,6 +6992,8 @@ static inline uint32_t regime_el(CPUARMState *env, ARMMMUIdx mmu_idx)
case ARMMMUIdx_S1SE1:
case ARMMMUIdx_S1NSE0:
case ARMMMUIdx_S1NSE1:
case ARMMMUIdx_MPriv:
case ARMMMUIdx_MUser:
return 1;
default:
g_assert_not_reached();
@ -7008,6 +7010,8 @@ static inline bool regime_is_secure(CPUARMState *env, ARMMMUIdx mmu_idx)
case ARMMMUIdx_S1NSE1:
case ARMMMUIdx_S1E2:
case ARMMMUIdx_S2NS:
case ARMMMUIdx_MPriv:
case ARMMMUIdx_MUser:
return false;
case ARMMMUIdx_S1E3:
case ARMMMUIdx_S1SE0:
@ -7146,6 +7150,7 @@ static inline bool regime_is_user(CPUARMState *env, ARMMMUIdx mmu_idx)
switch (mmu_idx) {
case ARMMMUIdx_S1SE0:
case ARMMMUIdx_S1NSE0:
case ARMMMUIdx_MUser:
return true;
default:
return false;

3
target/arm/translate.c
View File

@ -161,6 +161,9 @@ static inline int get_a32_user_mem_index(DisasContext *s)
case ARMMMUIdx_S1SE0:
case ARMMMUIdx_S1SE1:
return arm_to_core_mmu_idx(ARMMMUIdx_S1SE0);
case ARMMMUIdx_MUser:
case ARMMMUIdx_MPriv:
return arm_to_core_mmu_idx(ARMMMUIdx_MUser);
case ARMMMUIdx_S2NS:
default:
g_assert_not_reached();