Commit 84f2bed3 authored by Pranavkumar Sawargaonkar's avatar Pranavkumar Sawargaonkar Committed by Peter Maydell
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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: default avatarPranavkumar 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: default avatarPeter Maydell <peter.maydell@linaro.org>
parent 568bab1f

target-arm/cpu.c

+24 −0
Original line number Diff line number Diff line
@@ -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";

target-arm/cpu.h

+2 −0
Original line number Diff line number Diff line
@@ -32,6 +32,8 @@ 
#  define ELF_MACHINE EM_ARM

#endif



#define TARGET_IS_BIENDIAN 1



#define CPUArchState struct CPUARMState



#include "qemu-common.h"