arch/mips/include/asm/paccess.h

File Facts

System

Linux kernel

Corpus path

arch/mips/include/asm/paccess.h

Extension

.h

Size

3140 bytes

Lines

115

Domain

Architecture Layer

Bucket

arch/mips

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.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/errno.h

Detected Declarations

• struct __large_pstruct

Annotated Snippet

struct __large_pstruct { unsigned long buf[100]; };
#define __mp(x) (*(struct __large_pstruct *)(x))

#define __get_dbe(x, ptr, size)						\
({									\
	long __gu_err;							\
	__typeof__(*(ptr)) __gu_val;					\
	unsigned long __gu_addr;					\
	__asm__("":"=r" (__gu_val));					\
	__gu_addr = (unsigned long) (ptr);				\
	__asm__("":"=r" (__gu_err));					\
	switch (size) {							\
	case 1: __get_dbe_asm("lb"); break;				\
	case 2: __get_dbe_asm("lh"); break;				\
	case 4: __get_dbe_asm("lw"); break;				\
	case 8:	 __get_dbe_asm("ld"); break;				\
	default: __get_dbe_unknown(); break;				\
	}								\
	x = (__typeof__(*(ptr))) __gu_val;				\
	__gu_err;							\
})

#define __get_dbe_asm(insn)						\
{									\
	__asm__ __volatile__(						\
	"1:\t" insn "\t%1,%2\n\t"					\
	"move\t%0,$0\n"							\
	"2:\n\t"							\
	".insn\n\t"							\
	".section\t.fixup,\"ax\"\n"					\
	"3:\tli\t%0,%3\n\t"						\
	"move\t%1,$0\n\t"						\
	"j\t2b\n\t"							\
	".previous\n\t"							\
	".section\t__dbe_table,\"a\"\n\t"				\
	__PA_ADDR "\t1b, 3b\n\t"					\
	".previous"							\
	:"=r" (__gu_err), "=r" (__gu_val)				\
	:"o" (__mp(__gu_addr)), "i" (-EFAULT));				\
}

extern void __get_dbe_unknown(void);

#define __put_dbe(x, ptr, size)						\
({									\
	long __pu_err;							\
	__typeof__(*(ptr)) __pu_val;					\
	long __pu_addr;							\
	__pu_val = (x);							\
	__pu_addr = (long) (ptr);					\
	__asm__("":"=r" (__pu_err));					\
	switch (size) {							\
	case 1: __put_dbe_asm("sb"); break;				\
	case 2: __put_dbe_asm("sh"); break;				\
	case 4: __put_dbe_asm("sw"); break;				\
	case 8: __put_dbe_asm("sd"); break;				\
	default: __put_dbe_unknown(); break;				\
	}								\
	__pu_err;							\
})

#define __put_dbe_asm(insn)						\
{									\
	__asm__ __volatile__(						\
	"1:\t" insn "\t%1,%2\n\t"					\
	"move\t%0,$0\n"							\
	"2:\n\t"							\
	".insn\n\t"							\
	".section\t.fixup,\"ax\"\n"					\
	"3:\tli\t%0,%3\n\t"						\
	"j\t2b\n\t"							\
	".previous\n\t"							\
	".section\t__dbe_table,\"a\"\n\t"				\
	__PA_ADDR "\t1b, 3b\n\t"					\
	".previous"							\
	: "=r" (__pu_err)						\
	: "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT));	\
}

extern void __put_dbe_unknown(void);

extern unsigned long search_dbe_table(unsigned long addr);

#endif /* _ASM_PACCESS_H */

Annotation

• Immediate include surface: `linux/errno.h`.
• Detected declarations: `struct __large_pstruct`.
• Atlas domain: Architecture Layer / arch/mips.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.