[Qemu-devel] [PATCH v4 23/33] target-arm: add TTBR0_EL3 and make TTBR0/1 banked

[greg.bellows@linaro.org]

From: Fabian Aggeler <aggelerf@ethz.ch>

Add TTBR0 and maps secure/non-secure instance of ttbr0 and ttbr1
accordingly (translation table base register).

Signed-off-by: Fabian Aggeler <aggelerf@ethz.ch>
Signed-off-by: Greg Bellows <greg.bellows@linaro.org>
---
 target-arm/cpu.h    | 21 +++++++++++++++++++--
 target-arm/helper.c | 46 ++++++++++++++++++++++++++++++++++++----------
 2 files changed, 55 insertions(+), 12 deletions(-)

diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index bc8291a..a80b966 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -203,8 +203,25 @@ typedef struct CPUARMState {
         uint32_t c1_scr; /* secure config register.  */
         uint32_t c1_sder; /* Secure debug enable register. */
         uint32_t c1_nsacr; /* Non-secure access control register. */
-        uint64_t ttbr0_el1; /* MMU translation table base 0. */
-        uint64_t ttbr1_el1; /* MMU translation table base 1. */
+        union { /* MMU translation table base 0. */
+            struct {
+                uint64_t ttbr0_ns;
+                uint64_t ttbr0_s;
+            };
+            struct {
+                uint64_t ttbr0_el1;
+                uint64_t ttbr0_el3;
+            };
+        };
+        union { /* MMU translation table base 1. */
+            struct {
+                uint64_t ttbr1_ns;
+                uint64_t ttbr1_s;
+            };
+            struct {
+                uint64_t ttbr1_el1;
+            };
+        };
         uint64_t c2_control; /* MMU translation table base control.  */
         uint32_t c2_mask; /* MMU translation table base selection mask.  */
         uint32_t c2_base_mask; /* MMU translation table base 0 mask. */
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 4a3b463..1eb819d 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -1509,12 +1509,14 @@ static const ARMCPRegInfo vmsa_cp_reginfo[] = {
       .fieldoffset = offsetof(CPUARMState, cp15.esr_el[1]), .resetvalue = 0, },
     { .name = "TTBR0_EL1", .state = ARM_CP_STATE_BOTH,
       .opc0 = 3, .crn = 2, .crm = 0, .opc1 = 0, .opc2 = 0,
-      .access = PL1_RW, .fieldoffset = offsetof(CPUARMState, cp15.ttbr0_el1),
-      .writefn = vmsa_ttbr_write, .resetvalue = 0 },
+      .access = PL1_RW, .writefn = vmsa_ttbr_write, .resetvalue = 0,
+      .bank_fieldoffsets = { offsetof(CPUARMState, cp15.ttbr0_s),
+                             offsetof(CPUARMState, cp15.ttbr0_el1) } },
     { .name = "TTBR1_EL1", .state = ARM_CP_STATE_BOTH,
       .opc0 = 3, .crn = 2, .crm = 0, .opc1 = 0, .opc2 = 1,
-      .access = PL1_RW, .fieldoffset = offsetof(CPUARMState, cp15.ttbr1_el1),
-      .writefn = vmsa_ttbr_write, .resetvalue = 0 },
+      .access = PL1_RW, .writefn = vmsa_ttbr_write, .resetvalue = 0,
+      .bank_fieldoffsets = { offsetof(CPUARMState, cp15.ttbr1_s),
+                             offsetof(CPUARMState, cp15.ttbr1_el1) } },
     { .name = "TCR_EL1", .state = ARM_CP_STATE_AA64,
       .opc0 = 3, .crn = 2, .crm = 0, .opc1 = 0, .opc2 = 2,
       .access = PL1_RW, .writefn = vmsa_tcr_el1_write,
@@ -1755,11 +1757,13 @@ static const ARMCPRegInfo lpae_cp_reginfo[] = {
       .fieldoffset = offsetof(CPUARMState, cp15.par_el1), .resetvalue = 0 },
     { .name = "TTBR0", .cp = 15, .crm = 2, .opc1 = 0,
       .access = PL1_RW, .type = ARM_CP_64BIT | ARM_CP_NO_MIGRATE,
-      .fieldoffset = offsetof(CPUARMState, cp15.ttbr0_el1),
+      .bank_fieldoffsets = { offsetof(CPUARMState, cp15.ttbr0_s),
+                             offsetof(CPUARMState, cp15.ttbr0_ns) },
       .writefn = vmsa_ttbr_write, .resetfn = arm_cp_reset_ignore },
     { .name = "TTBR1", .cp = 15, .crm = 2, .opc1 = 1,
       .access = PL1_RW, .type = ARM_CP_64BIT | ARM_CP_NO_MIGRATE,
-      .fieldoffset = offsetof(CPUARMState, cp15.ttbr1_el1),
+      .bank_fieldoffsets = { offsetof(CPUARMState, cp15.ttbr1_s),
+                             offsetof(CPUARMState, cp15.ttbr1_ns) },
       .writefn = vmsa_ttbr_write, .resetfn = arm_cp_reset_ignore },
     REGINFO_SENTINEL
 };
@@ -2281,6 +2285,10 @@ static const ARMCPRegInfo v8_el3_cp_reginfo[] = {
       .opc0 = 3, .crn = 1, .crm = 0, .opc1 = 6, .opc2 = 0,
       .access = PL3_RW, .raw_writefn = raw_write, .writefn = sctlr_write,
       .fieldoffset = offsetof(CPUARMState, cp15.sctlr_el3) },
+    { .name = "TTBR0_EL3", .state = ARM_CP_STATE_AA64,
+      .opc0 = 3, .crn = 2, .crm = 0, .opc1 = 6, .opc2 = 0,
+      .access = PL3_RW, .writefn = vmsa_ttbr_write, .resetvalue = 0,
+      .fieldoffset = offsetof(CPUARMState, cp15.ttbr0_el3) },
     { .name = "ELR_EL3", .state = ARM_CP_STATE_AA64,
       .type = ARM_CP_NO_MIGRATE,
       .opc0 = 3, .opc1 = 6, .crn = 4, .crm = 0, .opc2 = 1,
@@ -4000,18 +4008,23 @@ static inline int check_ap(CPUARMState *env, int ap, int domain_prot,
 static bool get_level1_table_address(CPUARMState *env, uint32_t *table,
                                          uint32_t address)
 {
+    /* We only get here if EL1 is running in Aarch32. If EL3 is running in
+     * Aarch32 there is a secure and non-secure instance of the translation
+     * table registers.
+     */
     if (address & env->cp15.c2_mask) {
         if ((env->cp15.c2_control & TTBCR_PD1)) {
             /* Translation table walk disabled for TTBR1 */
             return false;
         }
-        *table = env->cp15.ttbr1_el1 & 0xffffc000;
+        *table = A32_BANKED_CURRENT_REG_GET(env, ttbr1) & 0xffffc000;
     } else {
         if ((env->cp15.c2_control & TTBCR_PD0)) {
             /* Translation table walk disabled for TTBR0 */
             return false;
         }
-        *table = env->cp15.ttbr0_el1 & env->cp15.c2_base_mask;
+        *table = A32_BANKED_CURRENT_REG_GET(env, ttbr0) &
+                 env->cp15.c2_base_mask;
     }
     *table |= (address >> 18) & 0x3ffc;
     return true;
@@ -4265,6 +4278,7 @@ static int get_phys_addr_lpae(CPUARMState *env, target_ulong address,
     int32_t granule_sz = 9;
     int32_t va_size = 32;
     int32_t tbi = 0;
+    uint32_t cur_el = arm_current_pl(env);
 
     if (arm_el_is_aa64(env, 1)) {
         va_size = 64;
@@ -4316,7 +4330,19 @@ static int get_phys_addr_lpae(CPUARMState *env, target_ulong address,
      * we will always flush the TLB any time the ASID is changed).
      */
     if (ttbr_select == 0) {
-        ttbr = env->cp15.ttbr0_el1;
+        if (arm_el_is_aa64(env, 3)) {
+            switch (cur_el) {
+            case 3:
+                ttbr = env->cp15.ttbr0_el3;
+                break;
+            case 1:
+            case 0:
+            default:
+                ttbr = env->cp15.ttbr0_el1;
+            }
+        } else {
+            ttbr = A32_BANKED_CURRENT_REG_GET(env, ttbr0);
+        }
         epd = extract32(env->cp15.c2_control, 7, 1);
         tsz = t0sz;
 
@@ -4328,7 +4354,7 @@ static int get_phys_addr_lpae(CPUARMState *env, target_ulong address,
             granule_sz = 11;
         }
     } else {
-        ttbr = env->cp15.ttbr1_el1;
+        ttbr = A32_BANKED_CURRENT_REG_GET(env, ttbr1);
         epd = extract32(env->cp15.c2_control, 23, 1);
         tsz = t1sz;
 
-- 
1.8.3.2