[Qemu-devel] [PULL v2 14/25] target/openrisc: Reduce tlb to a single dimension

[Stafford Horne]

From: Richard Henderson <address@hidden>

While we had defines for *_WAYS, we didn't define more than 1.
Reduce the complexity by eliminating this unused dimension.

Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
Signed-off-by: Stafford Horne <address@hidden>
---
 target/openrisc/cpu.h        |  6 ++----
 target/openrisc/machine.c    |  6 ++----
 target/openrisc/mmu.c        | 30 ++++++++++++++++--------------
 target/openrisc/sys_helper.c | 20 ++++++++++----------
 4 files changed, 30 insertions(+), 32 deletions(-)

diff --git a/target/openrisc/cpu.h b/target/openrisc/cpu.h
index a27adad085..eaf6cdd40e 100644
--- a/target/openrisc/cpu.h
+++ b/target/openrisc/cpu.h
@@ -222,10 +222,8 @@ enum {
 
 /* TLB size */
 enum {
-    DTLB_WAYS = 1,
     DTLB_SIZE = 64,
     DTLB_MASK = (DTLB_SIZE-1),
-    ITLB_WAYS = 1,
     ITLB_SIZE = 64,
     ITLB_MASK = (ITLB_SIZE-1),
 };
@@ -256,8 +254,8 @@ typedef struct OpenRISCTLBEntry {
 
 #ifndef CONFIG_USER_ONLY
 typedef struct CPUOpenRISCTLBContext {
-    OpenRISCTLBEntry itlb[ITLB_WAYS][ITLB_SIZE];
-    OpenRISCTLBEntry dtlb[DTLB_WAYS][DTLB_SIZE];
+    OpenRISCTLBEntry itlb[ITLB_SIZE];
+    OpenRISCTLBEntry dtlb[DTLB_SIZE];
 
     int (*cpu_openrisc_map_address_code)(struct OpenRISCCPU *cpu,
                                          hwaddr *physical,
diff --git a/target/openrisc/machine.c b/target/openrisc/machine.c
index 73e0abcfd7..b795b56dc6 100644
--- a/target/openrisc/machine.c
+++ b/target/openrisc/machine.c
@@ -42,11 +42,9 @@ static const VMStateDescription vmstate_cpu_tlb = {
     .minimum_version_id = 1,
     .minimum_version_id_old = 1,
     .fields = (VMStateField[]) {
-        VMSTATE_STRUCT_2DARRAY(itlb, CPUOpenRISCTLBContext,
-                             ITLB_WAYS, ITLB_SIZE, 0,
+        VMSTATE_STRUCT_ARRAY(itlb, CPUOpenRISCTLBContext, ITLB_SIZE, 0,
                              vmstate_tlb_entry, OpenRISCTLBEntry),
-        VMSTATE_STRUCT_2DARRAY(dtlb, CPUOpenRISCTLBContext,
-                             DTLB_WAYS, DTLB_SIZE, 0,
+        VMSTATE_STRUCT_ARRAY(dtlb, CPUOpenRISCTLBContext, DTLB_SIZE, 0,
                              vmstate_tlb_entry, OpenRISCTLBEntry),
         VMSTATE_END_OF_LIST()
     }
diff --git a/target/openrisc/mmu.c b/target/openrisc/mmu.c
index 9b4b5cf04f..856969a7f2 100644
--- a/target/openrisc/mmu.c
+++ b/target/openrisc/mmu.c
@@ -43,19 +43,21 @@ static int get_phys_code(OpenRISCCPU *cpu, hwaddr 
*physical, int *prot,
     int vpn = address >> TARGET_PAGE_BITS;
     int idx = vpn & ITLB_MASK;
     int right = 0;
+    uint32_t mr = cpu->env.tlb.itlb[idx].mr;
+    uint32_t tr = cpu->env.tlb.itlb[idx].tr;
 
-    if ((cpu->env.tlb.itlb[0][idx].mr >> TARGET_PAGE_BITS) != vpn) {
+    if ((mr >> TARGET_PAGE_BITS) != vpn) {
         return TLBRET_NOMATCH;
     }
-    if (!(cpu->env.tlb.itlb[0][idx].mr & 1)) {
+    if (!(mr & 1)) {
         return TLBRET_INVALID;
     }
     if (supervisor) {
-        if (cpu->env.tlb.itlb[0][idx].tr & SXE) {
+        if (tr & SXE) {
             right |= PAGE_EXEC;
         }
     } else {
-        if (cpu->env.tlb.itlb[0][idx].tr & UXE) {
+        if (tr & UXE) {
             right |= PAGE_EXEC;
         }
     }
@@ -63,8 +65,7 @@ static int get_phys_code(OpenRISCCPU *cpu, hwaddr *physical, 
int *prot,
         return TLBRET_BADADDR;
     }
 
-    *physical = (cpu->env.tlb.itlb[0][idx].tr & TARGET_PAGE_MASK) |
-                (address & (TARGET_PAGE_SIZE-1));
+    *physical = (tr & TARGET_PAGE_MASK) | (address & ~TARGET_PAGE_MASK);
     *prot = right;
     return TLBRET_MATCH;
 }
@@ -75,25 +76,27 @@ static int get_phys_data(OpenRISCCPU *cpu, hwaddr 
*physical, int *prot,
     int vpn = address >> TARGET_PAGE_BITS;
     int idx = vpn & DTLB_MASK;
     int right = 0;
+    uint32_t mr = cpu->env.tlb.dtlb[idx].mr;
+    uint32_t tr = cpu->env.tlb.dtlb[idx].tr;
 
-    if ((cpu->env.tlb.dtlb[0][idx].mr >> TARGET_PAGE_BITS) != vpn) {
+    if ((mr >> TARGET_PAGE_BITS) != vpn) {
         return TLBRET_NOMATCH;
     }
-    if (!(cpu->env.tlb.dtlb[0][idx].mr & 1)) {
+    if (!(mr & 1)) {
         return TLBRET_INVALID;
     }
     if (supervisor) {
-        if (cpu->env.tlb.dtlb[0][idx].tr & SRE) {
+        if (tr & SRE) {
             right |= PAGE_READ;
         }
-        if (cpu->env.tlb.dtlb[0][idx].tr & SWE) {
+        if (tr & SWE) {
             right |= PAGE_WRITE;
         }
     } else {
-        if (cpu->env.tlb.dtlb[0][idx].tr & URE) {
+        if (tr & URE) {
             right |= PAGE_READ;
         }
-        if (cpu->env.tlb.dtlb[0][idx].tr & UWE) {
+        if (tr & UWE) {
             right |= PAGE_WRITE;
         }
     }
@@ -105,8 +108,7 @@ static int get_phys_data(OpenRISCCPU *cpu, hwaddr 
*physical, int *prot,
         return TLBRET_BADADDR;
     }
 
-    *physical = (cpu->env.tlb.dtlb[0][idx].tr & TARGET_PAGE_MASK) |
-                (address & (TARGET_PAGE_SIZE-1));
+    *physical = (tr & TARGET_PAGE_MASK) | (address & ~TARGET_PAGE_MASK);
     *prot = right;
     return TLBRET_MATCH;
 }
diff --git a/target/openrisc/sys_helper.c b/target/openrisc/sys_helper.c
index 9b4339b34e..7f458b0d17 100644
--- a/target/openrisc/sys_helper.c
+++ b/target/openrisc/sys_helper.c
@@ -86,14 +86,14 @@ void HELPER(mtspr)(CPUOpenRISCState *env, target_ulong spr, 
target_ulong rb)
     case TO_SPR(1, 512) ... TO_SPR(1, 512+DTLB_SIZE-1): /* DTLBW0MR 0-127 */
         idx = spr - TO_SPR(1, 512);
         if (!(rb & 1)) {
-            tlb_flush_page(cs, env->tlb.dtlb[0][idx].mr & TARGET_PAGE_MASK);
+            tlb_flush_page(cs, env->tlb.dtlb[idx].mr & TARGET_PAGE_MASK);
         }
-        env->tlb.dtlb[0][idx].mr = rb;
+        env->tlb.dtlb[idx].mr = rb;
         break;
 
     case TO_SPR(1, 640) ... TO_SPR(1, 640+DTLB_SIZE-1): /* DTLBW0TR 0-127 */
         idx = spr - TO_SPR(1, 640);
-        env->tlb.dtlb[0][idx].tr = rb;
+        env->tlb.dtlb[idx].tr = rb;
         break;
     case TO_SPR(1, 768) ... TO_SPR(1, 895):   /* DTLBW1MR 0-127 */
     case TO_SPR(1, 896) ... TO_SPR(1, 1023):  /* DTLBW1TR 0-127 */
@@ -105,14 +105,14 @@ void HELPER(mtspr)(CPUOpenRISCState *env, target_ulong 
spr, target_ulong rb)
     case TO_SPR(2, 512) ... TO_SPR(2, 512+ITLB_SIZE-1):   /* ITLBW0MR 0-127 */
         idx = spr - TO_SPR(2, 512);
         if (!(rb & 1)) {
-            tlb_flush_page(cs, env->tlb.itlb[0][idx].mr & TARGET_PAGE_MASK);
+            tlb_flush_page(cs, env->tlb.itlb[idx].mr & TARGET_PAGE_MASK);
         }
-        env->tlb.itlb[0][idx].mr = rb;
+        env->tlb.itlb[idx].mr = rb;
         break;
 
     case TO_SPR(2, 640) ... TO_SPR(2, 640+ITLB_SIZE-1): /* ITLBW0TR 0-127 */
         idx = spr - TO_SPR(2, 640);
-        env->tlb.itlb[0][idx].tr = rb;
+        env->tlb.itlb[idx].tr = rb;
         break;
     case TO_SPR(2, 768) ... TO_SPR(2, 895):   /* ITLBW1MR 0-127 */
     case TO_SPR(2, 896) ... TO_SPR(2, 1023):  /* ITLBW1TR 0-127 */
@@ -244,11 +244,11 @@ target_ulong HELPER(mfspr)(CPUOpenRISCState *env, 
target_ulong rd,
 
     case TO_SPR(1, 512) ... TO_SPR(1, 512+DTLB_SIZE-1): /* DTLBW0MR 0-127 */
         idx = spr - TO_SPR(1, 512);
-        return env->tlb.dtlb[0][idx].mr;
+        return env->tlb.dtlb[idx].mr;
 
     case TO_SPR(1, 640) ... TO_SPR(1, 640+DTLB_SIZE-1): /* DTLBW0TR 0-127 */
         idx = spr - TO_SPR(1, 640);
-        return env->tlb.dtlb[0][idx].tr;
+        return env->tlb.dtlb[idx].tr;
 
     case TO_SPR(1, 768) ... TO_SPR(1, 895):   /* DTLBW1MR 0-127 */
     case TO_SPR(1, 896) ... TO_SPR(1, 1023):  /* DTLBW1TR 0-127 */
@@ -260,11 +260,11 @@ target_ulong HELPER(mfspr)(CPUOpenRISCState *env, 
target_ulong rd,
 
     case TO_SPR(2, 512) ... TO_SPR(2, 512+ITLB_SIZE-1): /* ITLBW0MR 0-127 */
         idx = spr - TO_SPR(2, 512);
-        return env->tlb.itlb[0][idx].mr;
+        return env->tlb.itlb[idx].mr;
 
     case TO_SPR(2, 640) ... TO_SPR(2, 640+ITLB_SIZE-1): /* ITLBW0TR 0-127 */
         idx = spr - TO_SPR(2, 640);
-        return env->tlb.itlb[0][idx].tr;
+        return env->tlb.itlb[idx].tr;
 
     case TO_SPR(2, 768) ... TO_SPR(2, 895):   /* ITLBW1MR 0-127 */
     case TO_SPR(2, 896) ... TO_SPR(2, 1023):  /* ITLBW1TR 0-127 */
-- 
2.17.0