svn commit: r338962 - head/sys/arm64/arm64
Andrew Turner
andrew at FreeBSD.org
Thu Sep 27 13:54:10 UTC 2018
Author: andrew
Date: Thu Sep 27 13:54:09 2018
New Revision: 338962
URL: https://svnweb.freebsd.org/changeset/base/338962
Log:
Export ID_AA64PFR0_EL1 to userland
Create a user view of the ID_AA64PFR0_EL1 register with values common
across all CPUs.
Approved by: re (kib)
Sponsored by: ABT Systems Ltd
Differential Revision: https://reviews.freebsd.org/D17301
Modified:
head/sys/arm64/arm64/identcpu.c
Modified: head/sys/arm64/arm64/identcpu.c
==============================================================================
--- head/sys/arm64/arm64/identcpu.c Thu Sep 27 13:50:57 2018 (r338961)
+++ head/sys/arm64/arm64/identcpu.c Thu Sep 27 13:54:09 2018 (r338962)
@@ -88,6 +88,7 @@ struct cpu_desc {
};
struct cpu_desc cpu_desc[MAXCPU];
+struct cpu_desc user_cpu_desc;
static u_int cpu_print_regs;
#define PRINT_ID_AA64_AFR0 0x00000001
#define PRINT_ID_AA64_AFR1 0x00000002
@@ -163,26 +164,77 @@ const struct cpu_implementers cpu_implementers[] = {
CPU_IMPLEMENTER_NONE,
};
-struct mrs_safe_value {
+#define MRS_TYPE_MASK 0xf
+#define MRS_INVALID 0
+#define MRS_EXACT 1
+#define MRS_EXACT_VAL(x) (MRS_EXACT | ((x) << 4))
+#define MRS_EXACT_FIELD(x) ((x) >> 4)
+#define MRS_LOWER 2
+
+struct mrs_field {
+ bool sign;
+ u_int type;
+ u_int shift;
+};
+
+#define MRS_FIELD(_sign, _type, _shift) \
+ { \
+ .sign = (_sign), \
+ .type = (_type), \
+ .shift = (_shift), \
+ }
+
+#define MRS_FIELD_END { .type = MRS_INVALID, }
+
+static struct mrs_field id_aa64pfr0_fields[] = {
+ MRS_FIELD(false, MRS_EXACT, ID_AA64PFR0_SVE_SHIFT),
+ MRS_FIELD(false, MRS_EXACT, ID_AA64PFR0_RAS_SHIFT),
+ MRS_FIELD(false, MRS_EXACT, ID_AA64PFR0_GIC_SHIFT),
+ MRS_FIELD(true, MRS_LOWER, ID_AA64PFR0_ADV_SIMD_SHIFT),
+ MRS_FIELD(true, MRS_LOWER, ID_AA64PFR0_FP_SHIFT),
+ MRS_FIELD(false, MRS_EXACT, ID_AA64PFR0_EL3_SHIFT),
+ MRS_FIELD(false, MRS_EXACT, ID_AA64PFR0_EL2_SHIFT),
+ MRS_FIELD(false, MRS_LOWER, ID_AA64PFR0_EL1_SHIFT),
+ MRS_FIELD(false, MRS_LOWER, ID_AA64PFR0_EL0_SHIFT),
+ MRS_FIELD_END,
+};
+
+static struct mrs_field id_aa64dfr0_fields[] = {
+ MRS_FIELD(false, MRS_EXACT, ID_AA64DFR0_PMS_VER_SHIFT),
+ MRS_FIELD(false, MRS_EXACT, ID_AA64DFR0_CTX_CMPS_SHIFT),
+ MRS_FIELD(false, MRS_EXACT, ID_AA64DFR0_WRPS_SHIFT),
+ MRS_FIELD(false, MRS_EXACT, ID_AA64DFR0_BRPS_SHIFT),
+ MRS_FIELD(false, MRS_EXACT, ID_AA64DFR0_PMU_VER_SHIFT),
+ MRS_FIELD(false, MRS_EXACT, ID_AA64DFR0_TRACE_VER_SHIFT),
+ MRS_FIELD(false, MRS_EXACT_VAL(0x6), ID_AA64DFR0_DEBUG_VER_SHIFT),
+ MRS_FIELD_END,
+};
+
+struct mrs_user_reg {
u_int CRm;
u_int Op2;
- uint64_t value;
+ size_t offset;
+ struct mrs_field *fields;
};
-static struct mrs_safe_value safe_values[] = {
+static struct mrs_user_reg user_regs[] = {
{ /* id_aa64pfr0_el1 */
.CRm = 4,
.Op2 = 0,
- .value = ID_AA64PFR0_ADV_SIMD_NONE | ID_AA64PFR0_FP_NONE |
- ID_AA64PFR0_EL1_64 | ID_AA64PFR0_EL0_64,
+ .offset = __offsetof(struct cpu_desc, id_aa64pfr0),
+ .fields = id_aa64pfr0_fields,
},
{ /* id_aa64dfr0_el1 */
.CRm = 5,
.Op2 = 0,
- .value = ID_AA64DFR0_DEBUG_VER_8,
+ .offset = __offsetof(struct cpu_desc, id_aa64dfr0),
+ .fields = id_aa64dfr0_fields,
},
};
+#define CPU_DESC_FIELD(desc, idx) \
+ *(uint64_t *)((char *)&(desc) + user_regs[(idx)].offset)
+
static int
user_mrs_handler(vm_offset_t va, uint32_t insn, struct trapframe *frame,
uint32_t esr)
@@ -213,9 +265,9 @@ user_mrs_handler(vm_offset_t va, uint32_t insn, struct
Op2 = mrs_Op2(insn);
value = 0;
- for (i = 0; i < nitems(safe_values); i++) {
- if (safe_values[i].CRm == CRm && safe_values[i].Op2 == Op2) {
- value = safe_values[i].value;
+ for (i = 0; i < nitems(user_regs); i++) {
+ if (user_regs[i].CRm == CRm && user_regs[i].Op2 == Op2) {
+ value = CPU_DESC_FIELD(user_cpu_desc, i);
break;
}
}
@@ -256,12 +308,64 @@ user_mrs_handler(vm_offset_t va, uint32_t insn, struct
}
static void
+update_user_regs(u_int cpu)
+{
+ struct mrs_field *fields;
+ uint64_t cur, value;
+ int i, j, cur_field, new_field;
+
+ for (i = 0; i < nitems(user_regs); i++) {
+ value = CPU_DESC_FIELD(cpu_desc[cpu], i);
+ if (cpu == 0)
+ cur = value;
+ else
+ cur = CPU_DESC_FIELD(user_cpu_desc, i);
+
+ fields = user_regs[i].fields;
+ for (j = 0; fields[j].type != 0; j++) {
+ switch (fields[j].type & MRS_TYPE_MASK) {
+ case MRS_EXACT:
+ cur &= ~(0xfu << fields[j].shift);
+ cur |=
+ (uint64_t)MRS_EXACT_FIELD(fields[j].type) <<
+ fields[j].shift;
+ break;
+ case MRS_LOWER:
+ new_field = (value >> fields[j].shift) & 0xf;
+ cur_field = (cur >> fields[j].shift) & 0xf;
+ if ((fields[j].sign &&
+ (int)new_field < (int)cur_field) ||
+ (!fields[j].sign &&
+ (u_int)new_field < (u_int)cur_field)) {
+ cur &= ~(0xfu << fields[j].shift);
+ cur |= new_field << fields[j].shift;
+ }
+ break;
+ default:
+ panic("Invalid field type: %d", fields[j].type);
+ }
+ }
+
+ CPU_DESC_FIELD(user_cpu_desc, i) = cur;
+ }
+}
+
+static void
identify_cpu_sysinit(void *dummy __unused)
{
int cpu;
+ /* Create a user visible cpu description with safe values */
+ memset(&user_cpu_desc, 0, sizeof(user_cpu_desc));
+ /* Safe values for these registers */
+ user_cpu_desc.id_aa64pfr0 = ID_AA64PFR0_ADV_SIMD_NONE |
+ ID_AA64PFR0_FP_NONE | ID_AA64PFR0_EL1_64 | ID_AA64PFR0_EL0_64;
+ user_cpu_desc.id_aa64dfr0 = ID_AA64DFR0_DEBUG_VER_8;
+
+
CPU_FOREACH(cpu) {
print_cpu_features(cpu);
+ update_user_regs(cpu);
}
install_undef_handler(true, user_mrs_handler);
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