arch/sh/include/asm/mmu_context_32.h

Source file repositories/reference/linux-study-clean/arch/sh/include/asm/mmu_context_32.h

File Facts

System
Linux kernel
Corpus path
arch/sh/include/asm/mmu_context_32.h
Extension
.h
Size
1136 bytes
Lines
52
Domain
Architecture Layer
Bucket
arch/sh
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_SH_MMU_CONTEXT_32_H
#define __ASM_SH_MMU_CONTEXT_32_H

#ifdef CONFIG_CPU_HAS_PTEAEX
static inline void set_asid(unsigned long asid)
{
	__raw_writel(asid, MMU_PTEAEX);
}

static inline unsigned long get_asid(void)
{
	return __raw_readl(MMU_PTEAEX) & MMU_CONTEXT_ASID_MASK;
}
#else
static inline void set_asid(unsigned long asid)
{
	unsigned long __dummy;

	__asm__ __volatile__ ("mov.l	%2, %0\n\t"
			      "and	%3, %0\n\t"
			      "or	%1, %0\n\t"
			      "mov.l	%0, %2"
			      : "=&r" (__dummy)
			      : "r" (asid), "m" (__m(MMU_PTEH)),
			        "r" (0xffffff00));
}

static inline unsigned long get_asid(void)
{
	unsigned long asid;

	__asm__ __volatile__ ("mov.l	%1, %0"
			      : "=r" (asid)
			      : "m" (__m(MMU_PTEH)));
	asid &= MMU_CONTEXT_ASID_MASK;
	return asid;
}
#endif /* CONFIG_CPU_HAS_PTEAEX */

/* MMU_TTB is used for optimizing the fault handling. */
static inline void set_TTB(pgd_t *pgd)
{
	__raw_writel((unsigned long)pgd, MMU_TTB);
}

static inline pgd_t *get_TTB(void)
{
	return (pgd_t *)__raw_readl(MMU_TTB);
}
#endif /* __ASM_SH_MMU_CONTEXT_32_H */

Annotation

Implementation Notes