* [Qemu-devel] [PATCH] target-ppc: Extend HWCAP2 bits for ISA 3.0
@ 2018-09-06 6:57 Sandipan Das
2018-09-06 7:04 ` Laurent Vivier
2018-09-07 1:30 ` David Gibson
0 siblings, 2 replies; 3+ messages in thread
From: Sandipan Das @ 2018-09-06 6:57 UTC (permalink / raw)
To: david, richard.henderson
Cc: qemu-devel, laurent, riku.voipio, nikunj, naveen.n.rao
This adds the HWCAP2 bit to detect if a linux user process is
running on an ISA 3.0 compliant cpu like POWER9. This can be
verified using a simple test program that prints the value in
the auxiliary vector for AT_HWCAP2 as shown below.
Before:
$ qemu-ppc64le -cpu power8 test
0x8c000000
$ qemu-ppc64le -cpu power9 test
0x8c000000
After:
$ qemu-ppc64le -cpu power8 test
0x8c000000
$ qemu-ppc64le -cpu power9 test
0x8c800000
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
---
linux-user/elfload.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 8638612aec..e97c4cde49 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -710,6 +710,7 @@ enum {
QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */
QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */
QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */
+ QEMU_PPC_FEATURE2_ARCH_3_00 = 0x00800000, /* ISA 3.00 */
};
#define ELF_HWCAP get_elf_hwcap()
@@ -764,6 +765,7 @@ static uint32_t get_elf_hwcap2(void)
GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR);
GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07);
+ GET_FEATURE2(PPC2_ISA300, QEMU_PPC_FEATURE2_ARCH_3_00);
#undef GET_FEATURE
#undef GET_FEATURE2
--
2.14.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [PATCH] target-ppc: Extend HWCAP2 bits for ISA 3.0
2018-09-06 6:57 [Qemu-devel] [PATCH] target-ppc: Extend HWCAP2 bits for ISA 3.0 Sandipan Das
@ 2018-09-06 7:04 ` Laurent Vivier
2018-09-07 1:30 ` David Gibson
1 sibling, 0 replies; 3+ messages in thread
From: Laurent Vivier @ 2018-09-06 7:04 UTC (permalink / raw)
To: Sandipan Das, david, richard.henderson
Cc: qemu-devel, riku.voipio, nikunj, naveen.n.rao
Le 06/09/2018 à 08:57, Sandipan Das a écrit :
> This adds the HWCAP2 bit to detect if a linux user process is
> running on an ISA 3.0 compliant cpu like POWER9. This can be
> verified using a simple test program that prints the value in
> the auxiliary vector for AT_HWCAP2 as shown below.
>
> Before:
> $ qemu-ppc64le -cpu power8 test
> 0x8c000000
>
> $ qemu-ppc64le -cpu power9 test
> 0x8c000000
>
> After:
> $ qemu-ppc64le -cpu power8 test
> 0x8c000000
>
> $ qemu-ppc64le -cpu power9 test
> 0x8c800000
>
> Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
> ---
> linux-user/elfload.c | 2 ++
> 1 file changed, 2 insertions(+)
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [PATCH] target-ppc: Extend HWCAP2 bits for ISA 3.0
2018-09-06 6:57 [Qemu-devel] [PATCH] target-ppc: Extend HWCAP2 bits for ISA 3.0 Sandipan Das
2018-09-06 7:04 ` Laurent Vivier
@ 2018-09-07 1:30 ` David Gibson
1 sibling, 0 replies; 3+ messages in thread
From: David Gibson @ 2018-09-07 1:30 UTC (permalink / raw)
To: Sandipan Das
Cc: richard.henderson, qemu-devel, laurent, riku.voipio, nikunj,
naveen.n.rao
[-- Attachment #1: Type: text/plain, Size: 1834 bytes --]
On Thu, Sep 06, 2018 at 12:27:29PM +0530, Sandipan Das wrote:
> This adds the HWCAP2 bit to detect if a linux user process is
> running on an ISA 3.0 compliant cpu like POWER9. This can be
> verified using a simple test program that prints the value in
> the auxiliary vector for AT_HWCAP2 as shown below.
>
> Before:
> $ qemu-ppc64le -cpu power8 test
> 0x8c000000
>
> $ qemu-ppc64le -cpu power9 test
> 0x8c000000
>
> After:
> $ qemu-ppc64le -cpu power8 test
> 0x8c000000
>
> $ qemu-ppc64le -cpu power9 test
> 0x8c800000
>
> Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Applied, thanks.
> ---
> linux-user/elfload.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/linux-user/elfload.c b/linux-user/elfload.c
> index 8638612aec..e97c4cde49 100644
> --- a/linux-user/elfload.c
> +++ b/linux-user/elfload.c
> @@ -710,6 +710,7 @@ enum {
> QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */
> QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */
> QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */
> + QEMU_PPC_FEATURE2_ARCH_3_00 = 0x00800000, /* ISA 3.00 */
> };
>
> #define ELF_HWCAP get_elf_hwcap()
> @@ -764,6 +765,7 @@ static uint32_t get_elf_hwcap2(void)
> GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR);
> GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
> PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07);
> + GET_FEATURE2(PPC2_ISA300, QEMU_PPC_FEATURE2_ARCH_3_00);
>
> #undef GET_FEATURE
> #undef GET_FEATURE2
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-09-06 6:57 [Qemu-devel] [PATCH] target-ppc: Extend HWCAP2 bits for ISA 3.0 Sandipan Das
2018-09-06 7:04 ` Laurent Vivier
2018-09-07 1:30 ` David Gibson
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