arch/arm/include/asm/dcc.h

Source file repositories/reference/linux-study-clean/arch/arm/include/asm/dcc.h

File Facts

System
Linux kernel
Corpus path
arch/arm/include/asm/dcc.h
Extension
.h
Size
623 bytes
Lines
34
Domain
Architecture Layer
Bucket
arch/arm
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

#include <asm/barrier.h>

static inline u32 __dcc_getstatus(void)
{
	u32 __ret;
	asm volatile("mrc p14, 0, %0, c0, c1, 0	@ read comms ctrl reg"
		: "=r" (__ret) : : "cc");

	return __ret;
}

static inline char __dcc_getchar(void)
{
	char __c;

	asm volatile("mrc p14, 0, %0, c0, c5, 0	@ read comms data reg"
		: "=r" (__c));
	isb();

	return __c;
}

static inline void __dcc_putchar(char c)
{
	asm volatile("mcr p14, 0, %0, c0, c5, 0	@ write a char"
		: /* no output register */
		: "r" (c));
	isb();
}

Annotation

Implementation Notes