arch/riscv/include/asm/vdso.h

Source file repositories/reference/linux-study-clean/arch/riscv/include/asm/vdso.h

File Facts

System
Linux kernel
Corpus path
arch/riscv/include/asm/vdso.h
Extension
.h
Size
1361 bytes
Lines
53
Domain
Architecture Layer
Bucket
arch/riscv
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_RISCV_VDSO_H
#define _ASM_RISCV_VDSO_H

/*
 * All systems with an MMU have a VDSO, but systems without an MMU don't
 * support shared libraries and therefore don't have one.
 */

#define __VDSO_PAGES    4

#ifndef __ASSEMBLER__

#ifdef CONFIG_MMU
#include <generated/vdso-offsets.h>
#endif

#ifdef CONFIG_RISCV_USER_CFI
#include <generated/vdso-cfi-offsets.h>
#endif

#ifdef CONFIG_RISCV_USER_CFI
#define VDSO_SYMBOL(base, name)							\
	  (riscv_has_extension_unlikely(RISCV_ISA_EXT_ZIMOP) ?			\
	  (void __user *)((unsigned long)(base) + __vdso_##name##_cfi_offset) :	\
	  (void __user *)((unsigned long)(base) + __vdso_##name##_offset))
#else
#define VDSO_SYMBOL(base, name)							\
	  ((void __user *)((unsigned long)(base) + __vdso_##name##_offset))
#endif

#ifdef CONFIG_COMPAT
#include <generated/compat_vdso-offsets.h>

#define COMPAT_VDSO_SYMBOL(base, name)						\
	(void __user *)((unsigned long)(base) + compat__vdso_##name##_offset)

#endif /* CONFIG_COMPAT */

extern char vdso_start[], vdso_end[];
extern char vdso_cfi_start[], vdso_cfi_end[];
extern char compat_vdso_start[], compat_vdso_end[];

#endif /* !__ASSEMBLER__ */

#endif /* _ASM_RISCV_VDSO_H */

Annotation

Implementation Notes