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target-arm: Guest cpu endianness determination for virtio KVM ARM/ARM64

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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>
This commit is contained in:
Pranavkumar Sawargaonkar 2015-02-05 13:37:25 +00:00 committed by Peter Maydell
parent 568bab1fb8
commit 84f2bed3cf
2 changed files with 26 additions and 0 deletions
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24
target-arm/cpu.c
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@ -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";

2
target-arm/cpu.h
View File

@ -32,6 +32,8 @@
# define ELF_MACHINE EM_ARM
#endif
#define TARGET_IS_BIENDIAN 1
#define CPUArchState struct CPUARMState
#include "qemu-common.h"