[PATCH v3 24/26] arm: vdso: Enable arm to use common headers

Vincenzo Frascino
2020-03-13T15:43:43Z

Enable arm to use only the common headers in the implementation
of the vDSO library.

Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
---
arch/arm/include/asm/cp15.h | 20 +------------
arch/arm/include/asm/processor.h | 11 +------
arch/arm/include/asm/vdso/cp15.h | 38 ++++++++++++++++++++++++
arch/arm/include/asm/vdso/gettimeofday.h | 4 +--
arch/arm/include/asm/vdso/processor.h | 22 ++++++++++++++
5 files changed, 64 insertions(+), 31 deletions(-)
create mode 100644 arch/arm/include/asm/vdso/cp15.h
create mode 100644 arch/arm/include/asm/vdso/processor.h

diff --git a/arch/arm/include/asm/cp15.h b/arch/arm/include/asm/cp15.h
index d2453e2d3f1f..a54230e65647 100644
--- a/arch/arm/include/asm/cp15.h
+++ b/arch/arm/include/asm/cp15.h
@@ -50,25 +50,7 @@

#ifdef CONFIG_CPU_CP15

-#define __ACCESS_CP15(CRn, Op1, CRm, Op2) \
- "mrc", "mcr", __stringify(p15, Op1, %0, CRn, CRm, Op2), u32
-#define __ACCESS_CP15_64(Op1, CRm) \
- "mrrc", "mcrr", __stringify(p15, Op1, %Q0, %R0, CRm), u64
-
-#define __read_sysreg(r, w, c, t) ({ \
- t __val; \
- asm volatile(r " " c : "=r" (__val)); \
- __val; \
-})
-#define read_sysreg(...) __read_sysreg(__VA_ARGS__)
-
-#define __write_sysreg(v, r, w, c, t) asm volatile(w " " c : : "r" ((t)(v)))
-#define write_sysreg(v, ...) __write_sysreg(v, __VA_ARGS__)
-
-#define BPIALL __ACCESS_CP15(c7, 0, c5, 6)
-#define ICIALLU __ACCESS_CP15(c7, 0, c5, 0)
-
-#define CNTVCT __ACCESS_CP15_64(1, c14)
+#include <asm/vdso/cp15.h>

extern unsigned long cr_alignment; /* defined in entry-armv.S */

diff --git a/arch/arm/include/asm/processor.h b/arch/arm/include/asm/processor.h
index 614bf829e454..b9241051e5cb 100644
--- a/arch/arm/include/asm/processor.h
+++ b/arch/arm/include/asm/processor.h
@@ -14,6 +14,7 @@
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/unified.h>
+#include <asm/vdso/processor.h>

#ifdef __KERNEL__
#define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
@@ -85,16 +86,6 @@ extern void release_thread(struct task_struct *);

unsigned long get_wchan(struct task_struct *p);

-#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
-#define cpu_relax() \
- do { \
- smp_mb(); \
- __asm__ __volatile__("nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;"); \
- } while (0)
-#else
-#define cpu_relax() barrier()
-#endif
-
#define task_pt_regs(p) \
((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)

diff --git a/arch/arm/include/asm/vdso/cp15.h b/arch/arm/include/asm/vdso/cp15.h
new file mode 100644
index 000000000000..bed16fa1865e
--- /dev/null
+++ b/arch/arm/include/asm/vdso/cp15.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 ARM Ltd.
+ */
+#ifndef __ASM_VDSO_CP15_H
+#define __ASM_VDSO_CP15_H
+
+#ifndef __ASSEMBLY__
+
+#ifdef CONFIG_CPU_CP15
+
+#include <linux/stringify.h>
+
+#define __ACCESS_CP15(CRn, Op1, CRm, Op2) \
+ "mrc", "mcr", __stringify(p15, Op1, %0, CRn, CRm, Op2), u32
+#define __ACCESS_CP15_64(Op1, CRm) \
+ "mrrc", "mcrr", __stringify(p15, Op1, %Q0, %R0, CRm), u64
+
+#define __read_sysreg(r, w, c, t) ({ \
+ t __val; \
+ asm volatile(r " " c : "=r" (__val)); \
+ __val; \
+})
+#define read_sysreg(...) __read_sysreg(__VA_ARGS__)
+
+#define __write_sysreg(v, r, w, c, t) asm volatile(w " " c : : "r" ((t)(v)))
+#define write_sysreg(v, ...) __write_sysreg(v, __VA_ARGS__)
+
+#define BPIALL __ACCESS_CP15(c7, 0, c5, 6)
+#define ICIALLU __ACCESS_CP15(c7, 0, c5, 0)
+
+#define CNTVCT __ACCESS_CP15_64(1, c14)
+
+#endif /* CONFIG_CPU_CP15 */
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_VDSO_CP15_H */
diff --git a/arch/arm/include/asm/vdso/gettimeofday.h b/arch/arm/include/asm/vdso/gettimeofday.h
index 07d791c65cf7..36dc18553ed8 100644
--- a/arch/arm/include/asm/vdso/gettimeofday.h
+++ b/arch/arm/include/asm/vdso/gettimeofday.h
@@ -7,9 +7,9 @@

#ifndef __ASSEMBLY__

-#include <asm/barrier.h>
-#include <asm/cp15.h>
+#include <asm/errno.h>
#include <asm/unistd.h>
+#include <asm/vdso/cp15.h>
#include <uapi/linux/time.h>

#define VDSO_HAS_CLOCK_GETRES 1
diff --git a/arch/arm/include/asm/vdso/processor.h b/arch/arm/include/asm/vdso/processor.h
new file mode 100644
index 000000000000..45efb3ff511c
--- /dev/null
+++ b/arch/arm/include/asm/vdso/processor.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 ARM Ltd.
+ */
+#ifndef __ASM_VDSO_PROCESSOR_H
+#define __ASM_VDSO_PROCESSOR_H
+
+#ifndef __ASSEMBLY__
+
+#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
+#define cpu_relax() \
+ do { \
+ smp_mb(); \
+ __asm__ __volatile__("nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;"); \
+ } while (0)
+#else
+#define cpu_relax() barrier()
+#endif
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_VDSO_PROCESSOR_H */
--
2.25.1