diff mbox series

[v2,10/66] target/arm: Remove is_subpage argument to pmsav8_mpu_lookup

Message ID 20220822152741.1617527-11-richard.henderson@linaro.org
State New
Headers show
Series target/arm: Implement FEAT_HAFDBS | expand

Commit Message

Richard Henderson Aug. 22, 2022, 3:26 p.m. UTC 
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>
---
 target/arm/internals.h |  4 ++--
 target/arm/m_helper.c  |  3 +--
 target/arm/ptw.c       | 18 +++++++++---------
 3 files changed, 12 insertions(+), 13 deletions(-)

Comments

Peter Maydell Sept. 20, 2022, 2:35 p.m. UTC | #1 
On Mon, 22 Aug 2022 at 16:54, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> 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>

> @@ -1722,7 +1722,7 @@ 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) {

There's a comment just above this that needs updating:

     * We set is_subpage to true if the region hit doesn't cover the
     * entire TARGET_PAGE the address is within.

Otherwise
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM
diff mbox series

Patch

diff --git a/target/arm/internals.h b/target/arm/internals.h
index 6786e08a78..fa8553a17e 100644
--- a/target/arm/internals.h
+++ b/target/arm/internals.h
@@ -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);
 
diff --git a/target/arm/m_helper.c b/target/arm/m_helper.c
index 69d4a63fa6..01263990dc 100644
--- a/target/arm/m_helper.c
+++ b/target/arm/m_helper.c
@@ -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;
diff --git a/target/arm/ptw.c b/target/arm/ptw.c
index 48c9363159..ec66ba6777 100644
--- a/target/arm/ptw.c
+++ b/target/arm/ptw.c
@@ -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
@@ -1722,7 +1722,7 @@  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 +1774,13 @@  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 +1972,6 @@  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 +2034,10 @@  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;
 }