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[Qemu-devel] [PULL 27/28] target-arm: Guest cpu endianness determination
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PULL 27/28] target-arm: Guest cpu endianness determination for virtio KVM ARM/ARM64 |
Date: |
Thu, 5 Feb 2015 14:03:06 +0000 |
From: Pranavkumar Sawargaonkar <address@hidden>
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 <address@hidden>
Message-id: address@hidden
[PMM: check CPSR_E in env->cpsr_uncached, not env->pstate.]
Signed-off-by: Peter Maydell <address@hidden>
---
target-arm/cpu.c | 24 ++++++++++++++++++++++++
target-arm/cpu.h | 2 ++
2 files changed, 26 insertions(+)
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";
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 3585754..1830a12 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -32,6 +32,8 @@
# define ELF_MACHINE EM_ARM
#endif
+#define TARGET_IS_BIENDIAN 1
+
#define CPUArchState struct CPUARMState
#include "qemu-common.h"
--
1.9.1
- [Qemu-devel] [PULL 00/28] target-arm queue, Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 01/28] target_arm: Remove memory region init from armv7m_init, Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 28/28] target-arm: fix for exponent comparison in recpe_f64, Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 26/28] target-arm: KVM64: Get and Sync up guest register state like kvm32., Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 27/28] target-arm: Guest cpu endianness determination for virtio KVM ARM/ARM64,
Peter Maydell <=
- [Qemu-devel] [PULL 25/28] disas/arm-a64.cc: Tell libvixl correct code addresses, Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 20/28] target-arm: Pass mmu_idx to get_phys_addr(), Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 23/28] target-arm: Fix brace style in reindented code, Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 12/28] hw/arm/virt: explain device-to-transport mapping in create_virtio_devices(), Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 22/28] target-arm: Reindent ancient page-table-walk code, Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 17/28] target-arm: Use correct mmu_idx for unprivileged loads and stores, Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 11/28] target-arm: check that LSB <= MSB in BFI instruction, Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 08/28] target-arm: Add checks that cpreg raw accesses are handled, Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 18/28] target-arm: Don't define any MMU_MODE*_SUFFIXes, Peter Maydell, 2015/02/05
- [Qemu-devel] [PULL 15/28] target-arm/translate-a64: Fix wrong mmu_idx usage for LDT/STT, Peter Maydell, 2015/02/05