From: ard.biesheuvel@linaro.org (Ard Biesheuvel)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/5] ARM: add support for AT_HWCAP2 ELF auxv entry
Date: Mon, 23 Dec 2013 15:06:28 +0100 [thread overview]
Message-ID: <1387807592-26375-2-git-send-email-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <1387807592-26375-1-git-send-email-ard.biesheuvel@linaro.org>
This enables AT_HWCAP2 for ARM. The generic support for this
new ELF auxv entry was added in commit 2171364d1a9 (powerpc:
Add HWCAP2 aux entry)
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
arch/arm/include/asm/hwcap.h | 3 ++-
arch/arm/include/uapi/asm/hwcap.h | 4 ++++
arch/arm/kernel/setup.c | 11 +++++++++++
3 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/arch/arm/include/asm/hwcap.h b/arch/arm/include/asm/hwcap.h
index 6ff56ec..6e183fd 100644
--- a/arch/arm/include/asm/hwcap.h
+++ b/arch/arm/include/asm/hwcap.h
@@ -9,6 +9,7 @@
* instruction set this cpu supports.
*/
#define ELF_HWCAP (elf_hwcap)
-extern unsigned int elf_hwcap;
+#define ELF_HWCAP2 (elf_hwcap2)
+extern unsigned int elf_hwcap, elf_hwcap2;
#endif
#endif
diff --git a/arch/arm/include/uapi/asm/hwcap.h b/arch/arm/include/uapi/asm/hwcap.h
index 7dcc10d..87768b5 100644
--- a/arch/arm/include/uapi/asm/hwcap.h
+++ b/arch/arm/include/uapi/asm/hwcap.h
@@ -28,4 +28,8 @@
#define HWCAP_LPAE (1 << 20)
#define HWCAP_EVTSTRM (1 << 21)
+/*
+ * HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2
+ */
+
#endif /* _UAPI__ASMARM_HWCAP_H */
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 987a7f5..ce3049c 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -100,6 +100,9 @@ EXPORT_SYMBOL(system_serial_high);
unsigned int elf_hwcap __read_mostly;
EXPORT_SYMBOL(elf_hwcap);
+unsigned int elf_hwcap2 __read_mostly;
+EXPORT_SYMBOL(elf_hwcap2);
+
#ifdef MULTI_CPU
struct processor processor __read_mostly;
@@ -992,6 +995,10 @@ static const char *hwcap_str[] = {
NULL
};
+static const char *hwcap2_str[] = {
+ NULL
+};
+
static int c_show(struct seq_file *m, void *v)
{
int i, j;
@@ -1015,6 +1022,10 @@ static int c_show(struct seq_file *m, void *v)
if (elf_hwcap & (1 << j))
seq_printf(m, "%s ", hwcap_str[j]);
+ for (j = 0; hwcap2_str[j]; j++)
+ if (elf_hwcap2 & (1 << j))
+ seq_printf(m, "%s ", hwcap2_str[j]);
+
seq_printf(m, "\nCPU implementer\t: 0x%02x\n", cpuid >> 24);
seq_printf(m, "CPU architecture: %s\n",
proc_arch[cpu_architecture()]);
--
1.8.3.2
next prev parent reply other threads:[~2013-12-23 14:06 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-23 14:06 [PATCH v2 0/5] arm64: advertise availability of CRC and crypto instructions Ard Biesheuvel
2013-12-23 14:06 ` Ard Biesheuvel [this message]
2014-01-20 17:39 ` [PATCH v2 1/5] ARM: add support for AT_HWCAP2 ELF auxv entry Catalin Marinas
2013-12-23 14:06 ` [PATCH v2 2/5] binfmt_elf: add ELF_HWCAP2 to compat auxv entries Ard Biesheuvel
2014-01-20 17:40 ` Catalin Marinas
2014-02-05 14:08 ` Ard Biesheuvel
2013-12-23 14:06 ` [PATCH v2 3/5] arm64: add AT_HWCAP2 support for 32-bit compat Ard Biesheuvel
2013-12-23 14:06 ` [PATCH v2 4/5] ARM: introduce HWCAP2 feature bits for ARMv8 Crypto Extensions Ard Biesheuvel
2014-01-20 17:41 ` Catalin Marinas
2013-12-23 14:06 ` [PATCH v2 5/5] arm64: advertise ARMv8 extensions to 32-bit compat ELF binaries Ard Biesheuvel
2014-01-20 17:43 ` Catalin Marinas
2014-01-07 9:22 ` [PATCH v2 0/5] arm64: advertise availability of CRC and crypto instructions Ard Biesheuvel
2014-01-20 17:38 ` Catalin Marinas
2014-01-20 17:44 ` Nicolas Pitre
2014-01-20 18:03 ` Ard Biesheuvel
2014-01-20 18:17 ` Nicolas Pitre
2014-01-20 18:32 ` Ard Biesheuvel
2014-01-20 18:55 ` Nicolas Pitre
2014-01-20 19:01 ` Ard Biesheuvel
2014-01-20 19:42 ` Nicolas Pitre
2014-01-21 15:12 ` Catalin Marinas
2014-01-21 8:55 ` Ard Biesheuvel
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