arch/sparc/include/asm/psr.h

Source file repositories/reference/linux-study-clean/arch/sparc/include/asm/psr.h

File Facts

System
Linux kernel
Corpus path
arch/sparc/include/asm/psr.h
Extension
.h
Size
1416 bytes
Lines
69
Domain
Architecture Layer
Bucket
arch/sparc
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 __LINUX_SPARC_PSR_H
#define __LINUX_SPARC_PSR_H

#include <uapi/asm/psr.h>


#ifndef __ASSEMBLER__
/* Get the %psr register. */
static inline unsigned int get_psr(void)
{
	unsigned int psr;
	__asm__ __volatile__(
		"rd	%%psr, %0\n\t"
		"nop\n\t"
		"nop\n\t"
		"nop\n\t"
	: "=r" (psr)
	: /* no inputs */
	: "memory");

	return psr;
}

static inline void put_psr(unsigned int new_psr)
{
	__asm__ __volatile__(
		"wr	%0, 0x0, %%psr\n\t"
		"nop\n\t"
		"nop\n\t"
		"nop\n\t"
	: /* no outputs */
	: "r" (new_psr)
	: "memory", "cc");
}

/* Get the %fsr register.  Be careful, make sure the floating point
 * enable bit is set in the %psr when you execute this or you will
 * incur a trap.
 */

extern unsigned int fsr_storage;

static inline unsigned int get_fsr(void)
{
	unsigned int fsr = 0;

	__asm__ __volatile__(
		"st	%%fsr, %1\n\t"
		"ld	%1, %0\n\t"
	: "=r" (fsr)
	: "m" (fsr_storage));

	return fsr;
}

#endif /* !(__ASSEMBLER__) */

#endif /* !(__LINUX_SPARC_PSR_H) */

Annotation

Implementation Notes