From: "Suzuki K. Poulose" <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: marc.zyngier@arm.com, will.deacon@arm.com, mark.rutland@arm.com,
catalin.marinas@arm.com, steve.capper@linaro.org,
linux-kernel@vger.kernel.org, andre.przywara@arm.com,
dave.martin@arm.com, Vladimir.Murzin@arm.com,
james.morse@arm.com, ard.biesheuvel@linaro.org,
edward.nevill@linaro.org, aph@redhat.com,
"Suzuki K. Poulose" <suzuki.poulose@arm.com>
Subject: [PATCH v2 10/22] arm64: Cleanup mixed endian support detection
Date: Mon, 5 Oct 2015 18:01:59 +0100 [thread overview]
Message-ID: <1444064531-25607-11-git-send-email-suzuki.poulose@arm.com> (raw)
In-Reply-To: <1444064531-25607-1-git-send-email-suzuki.poulose@arm.com>
Make use of the system wide safe register to decide the support
for mixed endian.
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
---
arch/arm64/kernel/cpufeature.c | 32 ++++++++++----------------------
1 file changed, 10 insertions(+), 22 deletions(-)
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index a4eff72..3506876 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -24,7 +24,6 @@
#include <asm/processor.h>
#include <asm/sysreg.h>
-static bool mixed_endian_el0 = true;
unsigned long elf_hwcap __read_mostly;
EXPORT_SYMBOL_GPL(elf_hwcap);
@@ -42,22 +41,6 @@ unsigned int compat_elf_hwcap2 __read_mostly;
DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS);
-
-bool cpu_supports_mixed_endian_el0(void)
-{
- return id_aa64mmfr0_mixed_endian_el0(read_cpuid(ID_AA64MMFR0_EL1));
-}
-
-bool system_supports_mixed_endian_el0(void)
-{
- return mixed_endian_el0;
-}
-
-static void update_mixed_endian_el0_support(struct cpuinfo_arm64 *info)
-{
- mixed_endian_el0 &= id_aa64mmfr0_mixed_endian_el0(info->reg_id_aa64mmfr0);
-}
-
#define ARM64_FTR_BITS(ftr_strict, ftr_type, ftr_shift, ftr_width, ftr_safe_val) \
{ \
.strict = ftr_strict, \
@@ -438,9 +421,6 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info)
init_cpu_ftr_reg(SYS_MVFR0_EL1, info->reg_mvfr0);
init_cpu_ftr_reg(SYS_MVFR1_EL1, info->reg_mvfr1);
init_cpu_ftr_reg(SYS_MVFR2_EL1, info->reg_mvfr2);
-
- /* This will be removed later, once we start using the infrastructure */
- update_mixed_endian_el0_support(info);
}
static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new)
@@ -590,8 +570,6 @@ void update_cpu_features(int cpu,
*/
WARN_TAINT_ONCE(taint, TAINT_CPU_OUT_OF_SPEC,
"Unsupported CPU feature variation.\n");
-
- update_mixed_endian_el0_support(info);
}
u64 read_system_reg(u32 id)
@@ -681,6 +659,16 @@ void check_local_cpu_features(void)
check_cpu_capabilities(arm64_features, "detected feature:");
}
+bool cpu_supports_mixed_endian_el0(void)
+{
+ return id_aa64mmfr0_mixed_endian_el0(read_cpuid(ID_AA64MMFR0_EL1));
+}
+
+bool system_supports_mixed_endian_el0(void)
+{
+ return id_aa64mmfr0_mixed_endian_el0(read_system_reg(SYS_ID_AA64MMFR0_EL1));
+}
+
void __init setup_cpu_features(void)
{
u64 features;
--
1.7.9.5
next prev parent reply other threads:[~2015-10-05 17:06 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-05 17:01 [PATCH v2 00/22] arm64: Consolidate CPU feature handling Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 01/22] arm64: Make the CPU information more clear Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 02/22] arm64: Delay ELF HWCAP initialisation until all CPUs are up Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 03/22] arm64: Move cpu feature detection code Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 04/22] arm64: Move mixed endian support detection Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 05/22] arm64: Move /proc/cpuinfo handling code Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 06/22] arm64: sys_reg: Define System register encoding Suzuki K. Poulose
2015-10-07 16:36 ` Catalin Marinas
2015-10-07 17:03 ` Suzuki K. Poulose
2015-10-08 14:43 ` Catalin Marinas
2015-10-08 16:13 ` Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 07/22] arm64: Keep track of CPU feature registers Suzuki K. Poulose
2015-10-07 17:16 ` Catalin Marinas
2015-10-08 9:55 ` Suzuki K. Poulose
2015-10-08 15:03 ` Catalin Marinas
2015-10-09 13:00 ` Suzuki K. Poulose
2015-10-12 17:01 ` Suzuki K. Poulose
2015-10-12 17:21 ` Mark Rutland
2015-10-13 9:40 ` Catalin Marinas
2015-10-09 10:56 ` Suzuki K. Poulose
2015-10-09 14:16 ` Catalin Marinas
2015-10-05 17:01 ` [PATCH v2 08/22] arm64: Consolidate CPU Sanity check to CPU Feature infrastructure Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 09/22] arm64: Read system wide CPUID value Suzuki K. Poulose
2015-10-05 17:01 ` Suzuki K. Poulose [this message]
2015-10-05 17:02 ` [PATCH v2 11/22] arm64: Populate cpuinfo after notify_cpu_starting Suzuki K. Poulose
2015-10-08 10:15 ` Catalin Marinas
2015-10-08 10:46 ` Suzuki K. Poulose
2015-10-09 15:01 ` Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 12/22] arm64: Delay cpu feature checks Suzuki K. Poulose
2015-10-06 4:41 ` kbuild test robot
2015-10-06 11:09 ` Suzuki K. Poulose
2015-10-08 11:08 ` Catalin Marinas
2015-10-13 10:12 ` Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 13/22] arm64: Make use of system wide capability checks Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 14/22] arm64: Cleanup HWCAP handling Suzuki K. Poulose
2015-10-08 11:10 ` Catalin Marinas
2015-10-08 11:17 ` Russell King - ARM Linux
2015-10-08 13:00 ` Catalin Marinas
2015-10-08 14:54 ` Edward Nevill
2015-10-05 17:02 ` [PATCH v2 15/22] arm64: Move FP/ASIMD hwcap handling to common code Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 16/22] arm64/debug: Make use of the system wide safe value Suzuki K. Poulose
2015-10-08 11:11 ` Catalin Marinas
2015-10-08 11:56 ` Suzuki K. Poulose
2015-10-08 15:08 ` Catalin Marinas
2015-10-08 15:57 ` Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 17/22] arm64/kvm: Make use of the system wide safe values Suzuki K. Poulose
2015-10-10 15:17 ` Christoffer Dall
2015-10-05 17:02 ` [PATCH v2 18/22] arm64: Add helper to decode register from instruction Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 19/22] arm64: cpufeature: Track the user visible fields Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 20/22] arm64: Expose feature registers by emulating MRS Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 21/22] arm64: cpuinfo: Expose MIDR_EL1 and REVIDR_EL1 to sysfs Suzuki K. Poulose
2015-10-06 9:09 ` Russell King - ARM Linux
2015-10-06 10:18 ` Steve Capper
2015-10-06 10:25 ` Mark Rutland
2015-10-06 10:29 ` Steve Capper
2015-10-06 19:16 ` Russell King - ARM Linux
2015-10-05 17:02 ` [PATCH v2 22/22] arm64: feature registers: Documentation Suzuki K. Poulose
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