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[Qemu-ppc] [PATCH] target-ppc: ppc64 target's virtio can be either endia
From: |
Greg Kurz |
Subject: |
[Qemu-ppc] [PATCH] target-ppc: ppc64 target's virtio can be either endian. (v3) |
Date: |
Fri, 17 Jan 2014 14:52:12 +0100 |
User-agent: |
StGit/0.16 |
We base it on the OS endian, as reflected by the endianness of the
interrupt vectors (handled through the ILE bit in the LPCR register).
This patch implements virtio_get_byteswap() over LPCR.
Using first_cpu to fetch the registers from KVM may look arbitrary
and awkward, but it is okay because KVM sets/unsets the ILE bit on
all CPUs.
Changes in v3:
- dropped the explicit calls to kvm_[get|put]_one_reg as LPCR is
now properly handled by the generic SPR code.
Changes in v2:
- call cpu_synchronize_state() instead of kvm_arch_get_registers().
Suggested-by: Benjamin Herrenschmidt <address@hidden>
Signed-off-by: Rusty Russell <address@hidden>
Signed-off-by: Greg Kurz <address@hidden>
Reviewed-by: Alexander Graf <address@hidden>
---
target-ppc/misc_helper.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/target-ppc/misc_helper.c b/target-ppc/misc_helper.c
index 616aab6..e8fc8a3 100644
--- a/target-ppc/misc_helper.c
+++ b/target-ppc/misc_helper.c
@@ -20,6 +20,8 @@
#include "helper.h"
#include "helper_regs.h"
+#include "hw/virtio/virtio.h"
+#include "sysemu/kvm.h"
/*****************************************************************************/
/* SPR accesses */
@@ -116,3 +118,13 @@ void ppc_store_msr(CPUPPCState *env, target_ulong value)
{
hreg_store_msr(env, value, 0);
}
+
+bool virtio_get_byteswap(void)
+{
+ PowerPCCPU *cp = POWERPC_CPU(first_cpu);
+ CPUPPCState *env = &cp->env;
+
+ cpu_synchronize_state(first_cpu);
+
+ return env->spr[SPR_LPCR] & LPCR_ILE;
+}
- [Qemu-ppc] [PATCH] target-ppc: ppc64 target's virtio can be either endian. (v3),
Greg Kurz <=