[v3] tcg: Improve atomicity support

[PATCH v3 36/57] tcg/loongarch64: Assert the host supports unaligned accesses

Richard Henderson posted 57 patches 2 years, 9 months ago

Diff against v1 v2 v4 v5
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Maintainers: Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Riku Voipio <riku.voipio@iki.fi>, Peter Xu <peterx@redhat.com>, David Hildenbrand <david@redhat.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Thomas Huth <thuth@redhat.com>, Song Gao <gaosong@loongson.cn>, Xiaojuan Yang <yangxiaojuan@loongson.cn>, WANG Xuerui <git@xen0n.name>, Aurelien Jarno <aurelien@aurel32.net>, Huacai Chen <chenhuacai@kernel.org>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, Palmer Dabbelt <palmer@dabbelt.com>, Alistair Francis <Alistair.Francis@wdc.com>, Stefan Weil <sw@weilnetz.de>

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[PATCH v3 36/57] tcg/loongarch64: Assert the host supports unaligned accesses

Posted by Richard Henderson 2 years, 9 months ago

This should be true of all server class loongarch64.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/loongarch64/tcg-target.c.inc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tcg/loongarch64/tcg-target.c.inc b/tcg/loongarch64/tcg-target.c.inc
index e651ec5c71..ccc13ffdb4 100644
--- a/tcg/loongarch64/tcg-target.c.inc
+++ b/tcg/loongarch64/tcg-target.c.inc
@@ -30,6 +30,7 @@
  */
 
 #include "../tcg-ldst.c.inc"
+#include <asm/hwcap.h>
 
 #ifdef CONFIG_DEBUG_TCG
 static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
@@ -1674,6 +1675,11 @@ static void tcg_target_qemu_prologue(TCGContext *s)
 
 static void tcg_target_init(TCGContext *s)
 {
+    unsigned long hwcap = qemu_getauxval(AT_HWCAP);
+
+    /* All server class loongarch have UAL; only embedded do not. */
+    assert(hwcap & HWCAP_LOONGARCH_UAL);
+
     tcg_target_available_regs[TCG_TYPE_I32] = ALL_GENERAL_REGS;
     tcg_target_available_regs[TCG_TYPE_I64] = ALL_GENERAL_REGS;
 
-- 
2.34.1