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target/arm: Implement the ARMv8.1-LOR extension 

Provide a trivial implementation with zero limited ordering regions,
which causes the LDLAR and STLLR instructions to devolve into the
LDAR and STLR instructions from the base ARMv8.0 instruction set.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20181210150501.7990-4-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2018-12-13 13:48:08 +00:00 committed by Peter Maydell
parent 7c208e0f41
commit 2d7137c10f
4 changed files with 93 additions and 0 deletions
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5
target/arm/cpu.h
View File

@ -3340,6 +3340,11 @@ static inline bool isar_feature_aa64_sve(const ARMISARegisters *id)
return FIELD_EX64(id->id_aa64pfr0, ID_AA64PFR0, SVE) != 0;
}
static inline bool isar_feature_aa64_lor(const ARMISARegisters *id)
{
return FIELD_EX64(id->id_aa64mmfr1, ID_AA64MMFR1, LO) != 0;
}
/*
* Forward to the above feature tests given an ARMCPU pointer.
*/

1
target/arm/cpu64.c
View File

@ -326,6 +326,7 @@ static void aarch64_max_initfn(Object *obj)
t = cpu->isar.id_aa64mmfr1;
t = FIELD_DP64(t, ID_AA64MMFR1, HPDS, 1); /* HPD */
t = FIELD_DP64(t, ID_AA64MMFR1, LO, 1);
cpu->isar.id_aa64mmfr1 = t;
/* Replicate the same data to the 32-bit id registers. */

75
target/arm/helper.c
View File

@ -1281,6 +1281,7 @@ static void scr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
{
/* Begin with base v8.0 state. */
uint32_t valid_mask = 0x3fff;
ARMCPU *cpu = arm_env_get_cpu(env);
if (arm_el_is_aa64(env, 3)) {
value |= SCR_FW | SCR_AW; /* these two bits are RES1. */
@ -1303,6 +1304,9 @@ static void scr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
valid_mask &= ~SCR_SMD;
}
}
if (cpu_isar_feature(aa64_lor, cpu)) {
valid_mask |= SCR_TLOR;
}
/* Clear all-context RES0 bits. */
value &= valid_mask;
@ -3963,6 +3967,9 @@ static void hcr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
*/
valid_mask &= ~HCR_TSC;
}
if (cpu_isar_feature(aa64_lor, cpu)) {
valid_mask |= HCR_TLOR;
}
/* Clear RES0 bits. */
value &= valid_mask;
@ -5018,6 +5025,42 @@ static uint64_t id_aa64pfr0_read(CPUARMState *env, const ARMCPRegInfo *ri)
return pfr0;
}
/* Shared logic between LORID and the rest of the LOR* registers.
* Secure state has already been delt with.
*/
static CPAccessResult access_lor_ns(CPUARMState *env)
{
int el = arm_current_el(env);
if (el < 2 && (arm_hcr_el2_eff(env) & HCR_TLOR)) {
return CP_ACCESS_TRAP_EL2;
}
if (el < 3 && (env->cp15.scr_el3 & SCR_TLOR)) {
return CP_ACCESS_TRAP_EL3;
}
return CP_ACCESS_OK;
}
static CPAccessResult access_lorid(CPUARMState *env, const ARMCPRegInfo *ri,
bool isread)
{
if (arm_is_secure_below_el3(env)) {
/* Access ok in secure mode. */
return CP_ACCESS_OK;
}
return access_lor_ns(env);
}
static CPAccessResult access_lor_other(CPUARMState *env,
const ARMCPRegInfo *ri, bool isread)
{
if (arm_is_secure_below_el3(env)) {
/* Access denied in secure mode. */
return CP_ACCESS_TRAP;
}
return access_lor_ns(env);
}
void register_cp_regs_for_features(ARMCPU *cpu)
{
/* Register all the coprocessor registers based on feature bits */
@ -5759,6 +5802,38 @@ void register_cp_regs_for_features(ARMCPU *cpu)
define_one_arm_cp_reg(cpu, &sctlr);
}
if (cpu_isar_feature(aa64_lor, cpu)) {
/*
* A trivial implementation of ARMv8.1-LOR leaves all of these
* registers fixed at 0, which indicates that there are zero
* supported Limited Ordering regions.
*/
static const ARMCPRegInfo lor_reginfo[] = {
{ .name = "LORSA_EL1", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 0, .crn = 10, .crm = 4, .opc2 = 0,
.access = PL1_RW, .accessfn = access_lor_other,
.type = ARM_CP_CONST, .resetvalue = 0 },
{ .name = "LOREA_EL1", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 0, .crn = 10, .crm = 4, .opc2 = 1,
.access = PL1_RW, .accessfn = access_lor_other,
.type = ARM_CP_CONST, .resetvalue = 0 },
{ .name = "LORN_EL1", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 0, .crn = 10, .crm = 4, .opc2 = 2,
.access = PL1_RW, .accessfn = access_lor_other,
.type = ARM_CP_CONST, .resetvalue = 0 },
{ .name = "LORC_EL1", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 0, .crn = 10, .crm = 4, .opc2 = 3,
.access = PL1_RW, .accessfn = access_lor_other,
.type = ARM_CP_CONST, .resetvalue = 0 },
{ .name = "LORID_EL1", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 0, .crn = 10, .crm = 4, .opc2 = 7,
.access = PL1_R, .accessfn = access_lorid,
.type = ARM_CP_CONST, .resetvalue = 0 },
REGINFO_SENTINEL
};
define_arm_cp_regs(cpu, lor_reginfo);
}
if (cpu_isar_feature(aa64_sve, cpu)) {
define_one_arm_cp_reg(cpu, &zcr_el1_reginfo);
if (arm_feature(env, ARM_FEATURE_EL2)) {

12
target/arm/translate-a64.c
View File

@ -2290,6 +2290,12 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
}
return;
case 0x8: /* STLLR */
if (!dc_isar_feature(aa64_lor, s)) {
break;
}
/* StoreLORelease is the same as Store-Release for QEMU. */
/* fall through */
case 0x9: /* STLR */
/* Generate ISS for non-exclusive accesses including LASR. */
if (rn == 31) {
@ -2301,6 +2307,12 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
disas_ldst_compute_iss_sf(size, false, 0), is_lasr);
return;
case 0xc: /* LDLAR */
if (!dc_isar_feature(aa64_lor, s)) {
break;
}
/* LoadLOAcquire is the same as Load-Acquire for QEMU. */
/* fall through */
case 0xd: /* LDAR */
/* Generate ISS for non-exclusive accesses including LASR. */
if (rn == 31) {