Minimal ARM LPAE support. Sufficient to boot Linux kernel on vexpress-a15
Signed-off-by: Alexey Starikovskiy <aysta...@gmail.com>
---
target-arm/cpu.h | 11 +-
target-arm/helper.c | 239 ++++++++++++++++++++++++++++++++++++++++++++----
target-arm/helper.h | 2
target-arm/machine.c | 16 +--
target-arm/translate.c | 46 ++++++---
5 files changed, 262 insertions(+), 52 deletions(-)
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 0d9b39c..1d87c7e 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -117,11 +117,9 @@ typedef struct CPUARMState {
uint32_t c1_coproc; /* Coprocessor access register. */
uint32_t c1_xscaleauxcr; /* XScale auxiliary control register. */
uint32_t c1_scr; /* secure config register. */
- uint32_t c2_base0; /* MMU translation table base 0. */
- uint32_t c2_base1; /* MMU translation table base 1. */
+ uint64_t c2_base0; /* MMU translation table base 0. */
+ uint64_t c2_base1; /* MMU translation table base 1. */
uint32_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. */
uint32_t c2_data; /* MPU data cachable bits. */
uint32_t c2_insn; /* MPU instruction cachable bits. */
uint32_t c3; /* MMU domain access control register
@@ -131,7 +129,7 @@ typedef struct CPUARMState {
uint32_t c6_region[8]; /* MPU base/size registers. */
uint32_t c6_insn; /* Fault address registers. */
uint32_t c6_data;
- uint32_t c7_par; /* Translation result. */
+ uint64_t c7_par; /* Translation result. */
uint32_t c9_insn; /* Cache lockdown registers. */
uint32_t c9_data;
uint32_t c9_pmcr; /* performance monitor control register */
@@ -383,6 +381,7 @@ enum arm_features {
ARM_FEATURE_ARM_DIV, /* divide supported in ARM encoding */
ARM_FEATURE_VFP4, /* VFPv4 (implies that NEON is v2) */
ARM_FEATURE_GENERIC_TIMER,
+ ARM_FEATURE_LPAE, /* Large Physical Address Extension */
};
static inline int arm_feature(CPUARMState *env, int feature)
@@ -455,7 +454,7 @@ void cpu_arm_set_cp_io(CPUARMState *env, int cpnum,
#define cpu_signal_handler cpu_arm_signal_handler
#define cpu_list arm_cpu_list
-#define CPU_SAVE_VERSION 6
+#define CPU_SAVE_VERSION 7
/* MMU modes definitions */
#define MMU_MODE0_SUFFIX _kernel
diff --git a/target-arm/helper.c b/target-arm/helper.c
index abe1c30..a5d5e7d 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -172,6 +172,7 @@ static void cpu_reset_model_id(CPUARMState *env, uint32_t
id)
set_feature(env, ARM_FEATURE_ARM_DIV);
set_feature(env, ARM_FEATURE_V7MP);
set_feature(env, ARM_FEATURE_GENERIC_TIMER);
+ set_feature(env, ARM_FEATURE_LPAE);
env->vfp.xregs[ARM_VFP_FPSID] = 0x410430f0;
env->vfp.xregs[ARM_VFP_MVFR0] = 0x10110222;
env->vfp.xregs[ARM_VFP_MVFR1] = 0x11111111;
@@ -325,7 +326,6 @@ void cpu_reset(CPUARMState *env)
}
}
env->vfp.xregs[ARM_VFP_FPEXC] = 0;
- env->cp15.c2_base_mask = 0xffffc000u;
/* v7 performance monitor control register: same implementor
* field as main ID register, and we implement no event counters.
*/
@@ -671,6 +671,16 @@ uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn)
cpu_abort(env, "cp15 insn %08x\n", insn);
}
+void HELPER(set_cp15_64)(CPUState *env, uint32_t insn, uint64_t val)
+{
+ cpu_abort(env, "cp15 insn %08x\n", insn);
+}
+
+uint64_t HELPER(get_cp15_64)(CPUState *env, uint32_t insn)
+{
+ cpu_abort(env, "cp15 insn %08x\n", insn);
+}
+
/* These should probably raise undefined insn exceptions. */
void HELPER(v7m_msr)(CPUState *env, uint32_t reg, uint32_t val)
{
@@ -1050,18 +1060,21 @@ static inline int check_ap(CPUState *env, int ap, int
domain_prot,
static uint32_t get_level1_table_address(CPUState *env, uint32_t address)
{
uint32_t table;
+ int t0size = env->cp15.c2_control & 0x7;
+ uint32_t mask = ~(((uint32_t)0xffffffffu) >> t0size);
- if (address & env->cp15.c2_mask)
+ if (address & mask)
table = env->cp15.c2_base1 & 0xffffc000;
- else
- table = env->cp15.c2_base0 & env->cp15.c2_base_mask;
-
+ else {
+ mask = ~((uint32_t)0x3fffu >> t0size);
+ table = env->cp15.c2_base0 & mask;
+ }
table |= (address >> 18) & 0x3ffc;
return table;
}
static int get_phys_addr_v5(CPUState *env, uint32_t address, int access_type,
- int is_user, uint32_t *phys_ptr, int *prot,
+ int is_user, uint64_t *phys_ptr, int *prot,
target_ulong *page_size)
{
int code;
@@ -1156,7 +1169,7 @@ do_fault:
}
static int get_phys_addr_v6(CPUState *env, uint32_t address, int access_type,
- int is_user, uint32_t *phys_ptr, int *prot,
+ int is_user, uint64_t *phys_ptr, int *prot,
target_ulong *page_size)
{
int code;
@@ -1260,7 +1273,7 @@ do_fault:
}
static int get_phys_addr_mpu(CPUState *env, uint32_t address, int access_type,
- int is_user, uint32_t *phys_ptr, int *prot)
+ int is_user, uint64_t *phys_ptr, int *prot)
{
int n;
uint32_t mask;
@@ -1319,9 +1332,155 @@ static int get_phys_addr_mpu(CPUState *env, uint32_t
address, int access_type,
return 0;
}
+static inline uint64_t bitrange(int m, int n) {
+ int len = m - n + 1; // inclusive
+ if (len < 1)
+ return 0;
+ return (((1ULL << len) - 1) << n);
+}
+
+static int get_phys_addr_lpae(CPUState *env, uint32_t address, int access_type,
+ int is_user, uint64_t *phys_ptr, int *prot,
+ target_ulong *page_size)
+{
+ uint64_t base_address = 0, ia = address;
+ bool base_found = false;
+ bool disabled = false;
+ int type = 1; // Translation
+ uint32_t ttbcr = env->cp15.c2_control;
+ uint64_t ttbr0 = env->cp15.c2_base0;
+ uint32_t t0size = ttbcr & 0x7; //T0SZ
+ int level = 0, start_bit;
+ bool is_secure = 1, lookup_secure = is_secure;
+ if (t0size || (ia & bitrange(31, 32 - t0size)) == 0) {
+ level = ((t0size & 6) == 0) ? 1 : 2;
+ int lowerbound = 9 * level - t0size - 4;
+ base_address = bitrange(39, lowerbound) & ttbr0;
+ base_found = true;
+ disabled = ttbcr & (1 << 7); // EPD0
+ start_bit = 31 - t0size;
+ //TODO unpack type info from TTBCR
+ }
+ uint32_t t1size = (ttbcr >> 16) & 0x7; // T1SZ
+ uint64_t ttbr1 = env->cp15.c2_base1;
+ if ((t1size == 0 && !base_found) || (bitrange(31, 32 - t1size) & ~ia) ==
0) {
+ level = ((t1size & 6) == 0) ? 1 : 2;
+ int lowerbound = 9 * level - t1size - 4;
+ base_address = bitrange(39, lowerbound) & ttbr1;
+ base_found = true;
+ disabled = ttbcr & (1 << 23); // EPD1
+ start_bit = 31 - t1size;
+ //TODO unpack type info from TTBCR
+ }
+ if (!base_found || disabled)
+ goto do_fault;
+ bool first_iteration = true;
+ bool table_rw = true;
+ bool table_user = true;
+ bool table_xn = false;
+ bool table_pxn = false;
+ uint32_t attrs = 0;
+ bool lookup_finished;
+ do {
+ lookup_finished = true;
+ bool block_translate = false;
+ int offset = 9 * level;
+ uint64_t ia_select;
+ if (first_iteration)
+ ia_select = ((ia & bitrange(start_bit, 39 - offset)) >> (39 -
offset - 3));
+ else
+ ia_select = ((ia & bitrange(47 - offset, 39 - offset)) >> (39 -
offset - 3));
+ uint64_t lookup_address = base_address | ia_select;
+ first_iteration = false;
+ uint64_t descriptor = ldq_phys(lookup_address);
+ if ((descriptor & 1) == 0) {
+ goto do_fault;
+ } else {
+ if ((descriptor & 2) == 0) {
+ if (level == 3) {
+ goto do_fault;
+ } else
+ block_translate = true;
+ } else {
+ if (level == 3)
+ block_translate = true;
+ else {
+ base_address = bitrange(39, 12) & descriptor;
+ lookup_secure = lookup_secure && !((descriptor >> 63) & 1);
+ table_rw = table_rw && !((descriptor >> 62) & 1);
+ table_user = table_user && !((descriptor >> 61) & 1);
+ table_xn = table_xn || ((descriptor >> 60) & 1);
+ table_pxn = table_pxn || ((descriptor >> 59) & 1);
+ lookup_finished = false;
+ }
+ }
+ }
+ if (block_translate) {
+ *phys_ptr = (bitrange(39, 39 - offset) & descriptor) | (bitrange(38 -
offset, 0) & ia);
+ attrs = ((descriptor & bitrange(54, 52)) >> 42) |
+ ((descriptor & bitrange(11, 2)) >> 2);
+ if (table_xn)
+ attrs |= 1 << 12;
+ if (table_pxn)
+ attrs |= 1 << 11;
+ if (is_secure && !lookup_secure)
+ attrs |= 1 << 9;
+ if (!table_rw)
+ attrs |= 1 << 5;
+ if (!table_user)
+ attrs &= ~(1UL << 4);
+ if (!lookup_secure)
+ attrs |= 1 << 3;
+ } else
+ ++level;
+ } while (!lookup_finished);
+ // checks
+ type = 2; // AccessFlag
+ if ((attrs & (1 << 8)) == 0)
+ goto do_fault;
+ *prot = 0;
+ if (((attrs >> 12) & 1) == 0)
+ *prot |= PAGE_EXEC; // XN
+ if (!is_user || ((attrs >> 11) & 1) == 0)
+ *prot |= PAGE_EXEC; // PXN
+ type = 3; // Permissions
+ switch ((attrs >> 4) & 3) {
+ case 0:
+ if (is_user)
+ goto do_fault;
+ // fall through
+ case 1:
+ *prot |= PAGE_READ | PAGE_WRITE;
+ break;
+ case 2:
+ if (is_user)
+ goto do_fault;
+ // fall through
+ case 3:
+ if (access_type == 1)
+ goto do_fault;
+ *prot |= PAGE_READ;
+ break;
+ }
+ switch (level) {
+ case 1:
+ *page_size = 0x40000000; //1G
+ break;
+ case 2:
+ *page_size = 0x200000; // 2M
+ break;
+ case 3:
+ *page_size = 0x1000; // 4k
+ break;
+ }
+ return 0;
+do_fault:
+ return (1 << 9) | (type << 2) | level; // DFSR value
+}
+
static inline int get_phys_addr(CPUState *env, uint32_t address,
int access_type, int is_user,
- uint32_t *phys_ptr, int *prot,
+ uint64_t *phys_ptr, int *prot,
target_ulong *page_size)
{
/* Fast Context Switch Extension. */
@@ -1336,8 +1495,10 @@ static inline int get_phys_addr(CPUState *env, uint32_t
address,
return 0;
} else if (arm_feature(env, ARM_FEATURE_MPU)) {
*page_size = TARGET_PAGE_SIZE;
- return get_phys_addr_mpu(env, address, access_type, is_user, phys_ptr,
- prot);
+ return get_phys_addr_mpu(env, address, access_type, is_user, phys_ptr,
prot);
+ } else if (env->cp15.c2_control & (1 << 31)) {
+ return get_phys_addr_lpae(env, address, access_type, is_user, phys_ptr,
+ prot, page_size);
} else if (env->cp15.c1_sys & (1 << 23)) {
return get_phys_addr_v6(env, address, access_type, is_user, phys_ptr,
prot, page_size);
@@ -1350,7 +1511,7 @@ static inline int get_phys_addr(CPUState *env, uint32_t
address,
int cpu_arm_handle_mmu_fault (CPUState *env, target_ulong address,
int access_type, int mmu_idx)
{
- uint32_t phys_addr;
+ uint64_t phys_addr;
target_ulong page_size;
int prot;
int ret, is_user;
@@ -1366,7 +1527,7 @@ int cpu_arm_handle_mmu_fault (CPUState *env, target_ulong
address,
return 0;
}
- if (access_type == 2) {
+ if (access_type == 2 && !arm_feature(env, ARM_FEATURE_LPAE)) {
env->cp15.c5_insn = ret;
env->cp15.c6_insn = address;
env->exception_index = EXCP_PREFETCH_ABORT;
@@ -1382,7 +1543,7 @@ int cpu_arm_handle_mmu_fault (CPUState *env, target_ulong
address,
target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
{
- uint32_t phys_addr;
+ uint64_t phys_addr;
target_ulong page_size;
int prot;
int ret;
@@ -1529,10 +1690,7 @@ void HELPER(set_cp15)(CPUState *env, uint32_t insn,
uint32_t val)
env->cp15.c2_base1 = val;
break;
case 2:
- val &= 7;
env->cp15.c2_control = val;
- env->cp15.c2_mask = ~(((uint32_t)0xffffffffu) >> val);
- env->cp15.c2_base_mask = ~((uint32_t)0x3fffu >> val);
break;
default:
goto bad_reg;
@@ -1611,7 +1769,7 @@ void HELPER(set_cp15)(CPUState *env, uint32_t insn,
uint32_t val)
}
break;
case 8: {
- uint32_t phys_addr;
+ uint64_t phys_addr;
target_ulong page_size;
int prot;
int ret, is_user = op2 & 2;
@@ -2261,6 +2419,51 @@ bad_reg:
return 0;
}
+void HELPER(set_cp15_64)(CPUState *env, uint32_t insn, uint64_t val)
+{
+ int crm = insn & 0xf;
+ int opc1 = (insn >> 4) & 0xf;
+ if (crm == 2) {
+ switch (opc1) {
+ case 0:
+ env->cp15.c2_base0 = val;
+ tlb_flush(env, 0); // might change ASID
+ return;
+ case 1:
+ env->cp15.c2_base1 = val;
+ tlb_flush(env, 0); // might change ASID
+ return;
+ default:;
+ }
+ } else if (crm == 7) {
+ if (opc1 == 0) {
+ env->cp15.c7_par = val;
+ return;
+ }
+ }
+ cpu_abort(env, "Unimplemented cp15 register 64bit write (c%d[%d])\n", crm,
opc1);
+}
+
+uint64_t HELPER(get_cp15_64)(CPUState *env, uint32_t insn)
+{
+ int crm = insn & 0xf;
+ int opc1 = (insn >> 4) & 0xf;
+ if (crm == 2) {
+ switch (opc1) {
+ case 0:
+ return env->cp15.c2_base0;
+ case 1:
+ return env->cp15.c2_base1;
+ default:;
+ }
+ } else if (crm == 7) {
+ if (opc1 == 0)
+ return env->cp15.c7_par;
+ }
+ cpu_abort(env, "Unimplemented cp15 register 64bit read (c%d[%d])\n", crm,
opc1);
+ return 0;
+}
+
void HELPER(set_r13_banked)(CPUState *env, uint32_t mode, uint32_t val)
{
if ((env->uncached_cpsr & CPSR_M) == mode) {
diff --git a/target-arm/helper.h b/target-arm/helper.h
index 16dd5fc..bc8151c 100644
--- a/target-arm/helper.h
+++ b/target-arm/helper.h
@@ -60,7 +60,9 @@ DEF_HELPER_3(v7m_msr, void, env, i32, i32)
DEF_HELPER_2(v7m_mrs, i32, env, i32)
DEF_HELPER_3(set_cp15, void, env, i32, i32)
+DEF_HELPER_3(set_cp15_64, void, env, i32, i64)
DEF_HELPER_2(get_cp15, i32, env, i32)
+DEF_HELPER_2(get_cp15_64, i64, env, i32)
DEF_HELPER_3(set_cp, void, env, i32, i32)
DEF_HELPER_2(get_cp, i32, env, i32)
diff --git a/target-arm/machine.c b/target-arm/machine.c
index f66b8df..8fa738e 100644
--- a/target-arm/machine.c
+++ b/target-arm/machine.c
@@ -27,11 +27,9 @@ void cpu_save(QEMUFile *f, void *opaque)
qemu_put_be32(f, env->cp15.c1_coproc);
qemu_put_be32(f, env->cp15.c1_xscaleauxcr);
qemu_put_be32(f, env->cp15.c1_scr);
- qemu_put_be32(f, env->cp15.c2_base0);
- qemu_put_be32(f, env->cp15.c2_base1);
+ qemu_put_be64(f, env->cp15.c2_base0);
+ qemu_put_be64(f, env->cp15.c2_base1);
qemu_put_be32(f, env->cp15.c2_control);
- qemu_put_be32(f, env->cp15.c2_mask);
- qemu_put_be32(f, env->cp15.c2_base_mask);
qemu_put_be32(f, env->cp15.c2_data);
qemu_put_be32(f, env->cp15.c2_insn);
qemu_put_be32(f, env->cp15.c3);
@@ -42,7 +40,7 @@ void cpu_save(QEMUFile *f, void *opaque)
}
qemu_put_be32(f, env->cp15.c6_insn);
qemu_put_be32(f, env->cp15.c6_data);
- qemu_put_be32(f, env->cp15.c7_par);
+ qemu_put_be64(f, env->cp15.c7_par);
qemu_put_be32(f, env->cp15.c9_insn);
qemu_put_be32(f, env->cp15.c9_data);
qemu_put_be32(f, env->cp15.c9_pmcr);
@@ -145,11 +143,9 @@ int cpu_load(QEMUFile *f, void *opaque, int version_id)
env->cp15.c1_coproc = qemu_get_be32(f);
env->cp15.c1_xscaleauxcr = qemu_get_be32(f);
env->cp15.c1_scr = qemu_get_be32(f);
- env->cp15.c2_base0 = qemu_get_be32(f);
- env->cp15.c2_base1 = qemu_get_be32(f);
+ env->cp15.c2_base0 = qemu_get_be64(f);
+ env->cp15.c2_base1 = qemu_get_be64(f);
env->cp15.c2_control = qemu_get_be32(f);
- env->cp15.c2_mask = qemu_get_be32(f);
- env->cp15.c2_base_mask = qemu_get_be32(f);
env->cp15.c2_data = qemu_get_be32(f);
env->cp15.c2_insn = qemu_get_be32(f);
env->cp15.c3 = qemu_get_be32(f);
@@ -160,7 +156,7 @@ int cpu_load(QEMUFile *f, void *opaque, int version_id)
}
env->cp15.c6_insn = qemu_get_be32(f);
env->cp15.c6_data = qemu_get_be32(f);
- env->cp15.c7_par = qemu_get_be32(f);
+ env->cp15.c7_par = qemu_get_be64(f);
env->cp15.c9_insn = qemu_get_be32(f);
env->cp15.c9_data = qemu_get_be32(f);
env->cp15.c9_pmcr = qemu_get_be32(f);
diff --git a/target-arm/translate.c b/target-arm/translate.c
index 280bfca..1f1dde0 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -2559,17 +2559,9 @@ static int disas_cp15_insn(CPUState *env, DisasContext
*s, uint32_t insn)
/* M profile cores use memory mapped registers instead of cp15. */
if (arm_feature(env, ARM_FEATURE_M))
- return 1;
+ return 1;
- if ((insn & (1 << 25)) == 0) {
- if (insn & (1 << 20)) {
- /* mrrc */
- return 1;
- }
- /* mcrr. Used for block cache operations, so implement as no-op. */
- return 0;
- }
- if ((insn & (1 << 4)) == 0) {
+ if ((insn & (1 << 4)) == 0 && (insn & (1 << 25))) {
/* cdp */
return 1;
}
@@ -2636,16 +2628,34 @@ static int disas_cp15_insn(CPUState *env, DisasContext
*s, uint32_t insn)
tmp2 = tcg_const_i32(insn);
if (insn & ARM_CP_RW_BIT) {
- tmp = tcg_temp_new_i32();
- gen_helper_get_cp15(tmp, cpu_env, tmp2);
- /* If the destination register is r15 then sets condition codes. */
- if (rd != 15)
- store_reg(s, rd, tmp);
- else
- tcg_temp_free_i32(tmp);
+ if ((insn & (1 << 25))) {
+ tmp = tcg_temp_new_i32();
+ gen_helper_get_cp15(tmp, cpu_env, tmp2);
+ /* If the destination register is r15 then sets condition codes.
*/
+ if (rd != 15)
+ store_reg(s, rd, tmp);
+ else
+ tcg_temp_free_i32(tmp);
+ } else {
+ int rd1 = (insn >> 16) & 0xf;
+ TCGv_i64 tmp1 = tcg_temp_new_i64();
+ gen_helper_get_cp15_64(tmp1, cpu_env, tmp2);
+ tcg_gen_trunc_i64_i32(cpu_R[rd], tmp1);
+ tcg_gen_shri_i64(tmp1, tmp1, 32);
+ tcg_gen_trunc_i64_i32(cpu_R[rd1], tmp1);
+ tcg_temp_free_i64(tmp1);
+ }
} else {
tmp = load_reg(s, rd);
- gen_helper_set_cp15(cpu_env, tmp2, tmp);
+ if ((insn & (1 << 25))) {
+ gen_helper_set_cp15(cpu_env, tmp2, tmp);
+ } else {
+ int rd1 = (insn >> 16) & 0xf;
+ TCGv_i64 tmp1 = tcg_temp_new_i64();
+ tcg_gen_concat_i32_i64(tmp1, cpu_R[rd], cpu_R[rd1]);
+ gen_helper_set_cp15_64(cpu_env, tmp2, tmp1);
+ tcg_temp_free_i64(tmp1);
+ }
tcg_temp_free_i32(tmp);
/* Normally we would always end the TB here, but Linux
* arch/arm/mach-pxa/sleep.S expects two instructions following
