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Subject[PATCH v3 05/24] arm64: Move mixed endian support detection
Date
Move the mixed endian support detection code to cpufeature.c
from cpuinfo.c. This also moves the update_cpu_features()
used by mixed endian detection code, which will get more
functionality.

Also moves the ID register field shifts to asm/sysreg.h,
where all the useful definitions will end up in later patches.

Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
---
arch/arm64/include/asm/cpu.h | 2 ++
arch/arm64/include/asm/cpufeature.h | 7 +++++++
arch/arm64/include/asm/cputype.h | 15 ---------------
arch/arm64/include/asm/sysreg.h | 3 +++
arch/arm64/kernel/cpufeature.c | 22 ++++++++++++++++++++++
arch/arm64/kernel/cpuinfo.c | 21 ---------------------
6 files changed, 34 insertions(+), 36 deletions(-)

diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h
index 8e797b2..30db691 100644
--- a/arch/arm64/include/asm/cpu.h
+++ b/arch/arm64/include/asm/cpu.h
@@ -63,4 +63,6 @@ DECLARE_PER_CPU(struct cpuinfo_arm64, cpu_data);
void cpuinfo_store_cpu(void);
void __init cpuinfo_store_boot_cpu(void);

+void update_cpu_features(struct cpuinfo_arm64 *info);
+
#endif /* __ASM_CPU_H */
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index b7769f6..b5f313d 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -10,6 +10,7 @@
#define __ASM_CPUFEATURE_H

#include <asm/hwcap.h>
+#include <asm/sysreg.h>

/*
* In the arm64 world (as in the ARM world), elf_hwcap is used both internally
@@ -81,6 +82,12 @@ static inline int __attribute_const__ cpuid_feature_extract_field(u64 features,
return (s64)(features << (64 - 4 - field)) >> (64 - 4);
}

+static inline bool id_aa64mmfr0_mixed_endian_el0(u64 mmfr0)
+{
+ return cpuid_feature_extract_field(mmfr0, ID_AA64MMFR0_BIGENDEL_SHIFT) == 0x1 ||
+ cpuid_feature_extract_field(mmfr0, ID_AA64MMFR0_BIGENDEL0_SHIFT) == 0x1;
+}
+
void __init setup_cpu_features(void);

void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
index ee6403d..31678b2 100644
--- a/arch/arm64/include/asm/cputype.h
+++ b/arch/arm64/include/asm/cputype.h
@@ -72,15 +72,6 @@

#define APM_CPU_PART_POTENZA 0x000

-#define ID_AA64MMFR0_BIGENDEL0_SHIFT 16
-#define ID_AA64MMFR0_BIGENDEL0_MASK (0xf << ID_AA64MMFR0_BIGENDEL0_SHIFT)
-#define ID_AA64MMFR0_BIGENDEL0(mmfr0) \
- (((mmfr0) & ID_AA64MMFR0_BIGENDEL0_MASK) >> ID_AA64MMFR0_BIGENDEL0_SHIFT)
-#define ID_AA64MMFR0_BIGEND_SHIFT 8
-#define ID_AA64MMFR0_BIGEND_MASK (0xf << ID_AA64MMFR0_BIGEND_SHIFT)
-#define ID_AA64MMFR0_BIGEND(mmfr0) \
- (((mmfr0) & ID_AA64MMFR0_BIGEND_MASK) >> ID_AA64MMFR0_BIGEND_SHIFT)
-
#ifndef __ASSEMBLY__

/*
@@ -112,12 +103,6 @@ static inline u32 __attribute_const__ read_cpuid_cachetype(void)
{
return read_cpuid(CTR_EL0);
}
-
-static inline bool id_aa64mmfr0_mixed_endian_el0(u64 mmfr0)
-{
- return (ID_AA64MMFR0_BIGEND(mmfr0) == 0x1) ||
- (ID_AA64MMFR0_BIGENDEL0(mmfr0) == 0x1);
-}
#endif /* __ASSEMBLY__ */

#endif
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index a7f3d4b..4246e41 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -44,6 +44,9 @@
#define SET_PSTATE_PAN(x) __inst_arm(0xd5000000 | REG_PSTATE_PAN_IMM |\
(!!x)<<8 | 0x1f)

+#define ID_AA64MMFR0_BIGENDEL0_SHIFT 16
+#define ID_AA64MMFR0_BIGENDEL_SHIFT 8
+
#ifdef __ASSEMBLY__

.irp num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index e49be15..1ae8b24 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -22,7 +22,9 @@
#include <asm/cpu.h>
#include <asm/cpufeature.h>
#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);

@@ -41,6 +43,26 @@ 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);
+}
+
+void update_cpu_features(struct cpuinfo_arm64 *info)
+{
+ update_mixed_endian_el0_support(info);
+}
+
static bool
feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry)
{
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index 75d5a86..8307b33 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -35,7 +35,6 @@
*/
DEFINE_PER_CPU(struct cpuinfo_arm64, cpu_data);
static struct cpuinfo_arm64 boot_cpu_data;
-static bool mixed_endian_el0 = true;

static char *icache_policy_str[] = {
[ICACHE_POLICY_RESERVED] = "RESERVED/UNKNOWN",
@@ -69,26 +68,6 @@ static void cpuinfo_detect_icache_policy(struct cpuinfo_arm64 *info)
pr_info("Detected %s I-cache on CPU%d\n", icache_policy_str[l1ip], cpu);
}

-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);
-}
-
-static void update_cpu_features(struct cpuinfo_arm64 *info)
-{
- update_mixed_endian_el0_support(info);
-}
-
static int check_reg_mask(char *name, u64 mask, u64 boot, u64 cur, int cpu)
{
if ((boot & mask) == (cur & mask))
--
1.7.9.5


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