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author | Pranavkumar Sawargaonkar <pranavkumar@linaro.org> | 2015-02-05 13:37:25 +0000 |
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committer | Peter Maydell <peter.maydell@linaro.org> | 2015-02-05 13:37:25 +0000 |
commit | 84f2bed3cf505f90b7918e2de32e11da27160563 (patch) | |
tree | 9d09d21073fde611f6fc4de86780401f45048595 /target-arm/cpu.c | |
parent | 568bab1fb8cb2237f0134c4c5ffbc2a8ea26df69 (diff) | |
download | hqemu-84f2bed3cf505f90b7918e2de32e11da27160563.zip hqemu-84f2bed3cf505f90b7918e2de32e11da27160563.tar.gz |
target-arm: Guest cpu endianness determination for virtio KVM ARM/ARM64
This patch implements a fucntion pointer "virtio_is_big_endian"
from "CPUClass" structure for arm/arm64.
Function arm_cpu_is_big_endian() is added to determine and
return the guest cpu endianness to virtio.
This is required for running cross endian guests with virtio on ARM/ARM64.
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Message-id: 1423130382-18640-3-git-send-email-pranavkumar@linaro.org
[PMM: check CPSR_E in env->cpsr_uncached, not env->pstate.]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target-arm/cpu.c')
-rw-r--r-- | target-arm/cpu.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/target-arm/cpu.c b/target-arm/cpu.c index f43e2de..d38af74 100644 --- a/target-arm/cpu.c +++ b/target-arm/cpu.c @@ -327,6 +327,29 @@ static void arm_cpu_kvm_set_irq(void *opaque, int irq, int level) kvm_set_irq(kvm_state, kvm_irq, level ? 1 : 0); #endif } + +static bool arm_cpu_is_big_endian(CPUState *cs) +{ + ARMCPU *cpu = ARM_CPU(cs); + CPUARMState *env = &cpu->env; + int cur_el; + + cpu_synchronize_state(cs); + + /* In 32bit guest endianness is determined by looking at CPSR's E bit */ + if (!is_a64(env)) { + return (env->uncached_cpsr & CPSR_E) ? 1 : 0; + } + + cur_el = arm_current_el(env); + + if (cur_el == 0) { + return (env->cp15.sctlr_el[1] & SCTLR_E0E) != 0; + } + + return (env->cp15.sctlr_el[cur_el] & SCTLR_EE) != 0; +} + #endif static inline void set_feature(CPUARMState *env, int feature) @@ -1196,6 +1219,7 @@ static void arm_cpu_class_init(ObjectClass *oc, void *data) cc->do_interrupt = arm_cpu_do_interrupt; cc->get_phys_page_debug = arm_cpu_get_phys_page_debug; cc->vmsd = &vmstate_arm_cpu; + cc->virtio_is_big_endian = arm_cpu_is_big_endian; #endif cc->gdb_num_core_regs = 26; cc->gdb_core_xml_file = "arm-core.xml"; |