diff options
Diffstat (limited to 'target/arm/cpu.c')
| -rw-r--r-- | target/arm/cpu.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/target/arm/cpu.c b/target/arm/cpu.c index 4d5bb57f07..353fc48567 100644 --- a/target/arm/cpu.c +++ b/target/arm/cpu.c @@ -1277,6 +1277,9 @@ static Property arm_cpu_cfgend_property = static Property arm_cpu_has_vfp_property = DEFINE_PROP_BOOL("vfp", ARMCPU, has_vfp, true); +static Property arm_cpu_has_vfp_d32_property = + DEFINE_PROP_BOOL("vfp-d32", ARMCPU, has_vfp_d32, true); + static Property arm_cpu_has_neon_property = DEFINE_PROP_BOOL("neon", ARMCPU, has_neon, true); @@ -1408,6 +1411,22 @@ void arm_cpu_post_init(Object *obj) } } + if (cpu->has_vfp && cpu_isar_feature(aa32_simd_r32, cpu)) { + cpu->has_vfp_d32 = true; + if (!kvm_enabled()) { + /* + * The permitted values of the SIMDReg bits [3:0] on + * Armv8-A are either 0b0000 and 0b0010. On such CPUs, + * make sure that has_vfp_d32 can not be set to false. + */ + if (!(arm_feature(&cpu->env, ARM_FEATURE_V8) && + !arm_feature(&cpu->env, ARM_FEATURE_M))) { + qdev_property_add_static(DEVICE(obj), + &arm_cpu_has_vfp_d32_property); + } + } + } + if (arm_feature(&cpu->env, ARM_FEATURE_NEON)) { cpu->has_neon = true; if (!kvm_enabled()) { @@ -1674,6 +1693,19 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp) return; } + if (cpu->has_vfp_d32 != cpu->has_neon) { + error_setg(errp, "ARM CPUs must have both VFP-D32 and Neon or neither"); + return; + } + + if (!cpu->has_vfp_d32) { + uint32_t u; + + u = cpu->isar.mvfr0; + u = FIELD_DP32(u, MVFR0, SIMDREG, 1); /* 16 registers */ + cpu->isar.mvfr0 = u; + } + if (!cpu->has_vfp) { uint64_t t; uint32_t u; |