* [Qemu-devel] [PATCH] linux-user: Report AArch64 FP16 support via hwcap bits
@ 2018-02-27 18:39 Peter Maydell
2018-02-27 18:57 ` Richard Henderson
0 siblings, 1 reply; 2+ messages in thread
From: Peter Maydell @ 2018-02-27 18:39 UTC (permalink / raw)
To: qemu-arm, qemu-devel; +Cc: patches, Richard Henderson, Alex Bennée
Set the appropriate Linux hwcap bits to tell the guest binary if we
have implemented half-precision floating point support.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
This is intended to go after Alex's FP16 stuff since it
uses the ARM_FEATURE_V8_FP16 bit that defines.
There is as yet no kernel definition of an AArch32 hwcap
bit to report FP16.
Based-on: <20180227143852.11175-1-alex.bennee@linaro.org>
linux-user/elfload.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 8bb9a2c3e8..80f1b32fbe 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -551,6 +551,8 @@ static uint32_t get_elf_hwcap(void)
GET_FEATURE(ARM_FEATURE_V8_SM3, ARM_HWCAP_A64_SM3);
GET_FEATURE(ARM_FEATURE_V8_SM4, ARM_HWCAP_A64_SM4);
GET_FEATURE(ARM_FEATURE_V8_SHA512, ARM_HWCAP_A64_SHA512);
+ GET_FEATURE(ARM_FEATURE_V8_FP16,
+ ARM_HWCAP_A64_FPHP | ARM_HWCAP_A64_ASIMDHP);
#undef GET_FEATURE
return hwcaps;
--
2.16.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] [PATCH] linux-user: Report AArch64 FP16 support via hwcap bits
2018-02-27 18:39 [Qemu-devel] [PATCH] linux-user: Report AArch64 FP16 support via hwcap bits Peter Maydell
@ 2018-02-27 18:57 ` Richard Henderson
0 siblings, 0 replies; 2+ messages in thread
From: Richard Henderson @ 2018-02-27 18:57 UTC (permalink / raw)
To: Peter Maydell, qemu-arm, qemu-devel; +Cc: patches, Alex Bennée
On 02/27/2018 10:39 AM, Peter Maydell wrote:
> Set the appropriate Linux hwcap bits to tell the guest binary if we
> have implemented half-precision floating point support.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
> This is intended to go after Alex's FP16 stuff since it
> uses the ARM_FEATURE_V8_FP16 bit that defines.
> There is as yet no kernel definition of an AArch32 hwcap
> bit to report FP16.
>
> Based-on: <20180227143852.11175-1-alex.bennee@linaro.org>
>
> linux-user/elfload.c | 2 ++
> 1 file changed, 2 insertions(+)
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
r~
^ permalink raw reply [flat|nested] 2+ messages in thread
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