Sufficient to boot Linux kernel on vexpress-a15
Missing:
* Extends the DBGDRAR and DBGDSAR to 64 bits, to hold PAs of up to 40 bits.
* Defines two Memory Attribute Indirection Registers, MAIRn, to replace PRRR
and NMRR when
using the Long-descriptor translation table format.
* Provides two IMPLEMENTATION DEFINED Auxiliary Memory Attribute Indirection
Registers 0
AMAIRn.
Does not change behaviour of Short-descriptor format (AKA _v6)
Signed-off-by: Alexey Starikovskiy <aysta...@gmail.com>
---
target-arm/cpu.h | 1
target-arm/helper.c | 231 +++++++++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 221 insertions(+), 11 deletions(-)
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 0298a98..1d87c7e 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -381,6 +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)
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 3c4c0e4..b0d7b93 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;
@@ -1073,7 +1074,7 @@ static uint32_t get_level1_table_address(CPUState *env,
uint32_t address)
}
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;
@@ -1168,7 +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;
@@ -1272,7 +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;
@@ -1331,9 +1332,176 @@ 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 range */
+ 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;
+ 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;
+ uint64_t ttbr1 = env->cp15.c2_base1;
+ if ((t1size == 0 && !base_found) || !(bitrange(31, 32 - t1size) & ~ia)) {
+ 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)) >>
+ (36 - offset);
+ } else {
+ ia_select = (ia & bitrange(47 - offset, 39 - offset)) >>
+ (36 - offset);
+ }
+ 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);
+ type = 2; /* checks */
+ /* 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. */
@@ -1348,8 +1516,11 @@ 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);
@@ -1362,7 +1533,7 @@ 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;
@@ -1378,7 +1549,7 @@ 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;
@@ -1394,7 +1565,7 @@ 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;
@@ -1541,7 +1712,6 @@ 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;
break;
default:
@@ -1621,7 +1791,7 @@ 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;
@@ -2275,12 +2445,51 @@ void HELPER(set_cp15_64)(CPUState *env, uint32_t insn,
uint64_t val)
{
int crm = insn & 0xf;
int opc1 = (insn >> 4) & 0xf;
+ if (arm_feature(env, ARM_FEATURE_LPAE)) {
+ 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)
{
+ if (arm_feature(env, ARM_FEATURE_LPAE)) {
+ 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;
+ }
+ }
+ }
/* Used for block cache operations, so just return 0 */
#if 0
cpu_abort(env, "Unimplemented cp15 register 64bit read (c%d[%d])\n",
