arch/m68k/include/asm/page_mm.h

Source file repositories/reference/linux-study-clean/arch/m68k/include/asm/page_mm.h

File Facts

System
Linux kernel
Corpus path
arch/m68k/include/asm/page_mm.h
Extension
.h
Size
3386 bytes
Lines
150
Domain
Architecture Layer
Bucket
arch/m68k
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 _M68K_PAGE_MM_H
#define _M68K_PAGE_MM_H

#ifndef __ASSEMBLER__

#include <linux/compiler.h>
#include <asm/module.h>

/*
 * We don't need to check for alignment etc.
 */
#ifdef CPU_M68040_OR_M68060_ONLY
static inline void copy_page(void *to, void *from)
{
	unsigned long tmp;

	__asm__ __volatile__("1:\t"
			     ".chip 68040\n\t"
			     "move16 %1@+,%0@+\n\t"
			     "move16 %1@+,%0@+\n\t"
			     ".chip 68k\n\t"
			     "dbra  %2,1b\n\t"
			     : "=a" (to), "=a" (from), "=d" (tmp)
			     : "0" (to), "1" (from), "2" (PAGE_SIZE / 32 - 1));
}

static inline void clear_page(void *page)
{
	unsigned long tmp;
	unsigned long *sp = page;

	*sp++ = 0;
	*sp++ = 0;
	*sp++ = 0;
	*sp++ = 0;

	__asm__ __volatile__("1:\t"
			     ".chip 68040\n\t"
			     "move16 %2@+,%0@+\n\t"
			     ".chip 68k\n\t"
			     "subqw  #8,%2\n\t"
			     "subqw  #8,%2\n\t"
			     "dbra   %1,1b\n\t"
			     : "=a" (sp), "=d" (tmp)
			     : "a" (page), "0" (sp),
			       "1" ((PAGE_SIZE - 16) / 16 - 1));
}

#else
#define clear_page(page)	memset((page), 0, PAGE_SIZE)
#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)
#endif

#define clear_user_page(addr, vaddr, page)	\
	do {	clear_page(addr);		\
		flush_dcache_page(page);	\
	} while (0)
#define copy_user_page(to, from, vaddr, page)	\
	do {	copy_page(to, from);		\
		flush_dcache_page(page);	\
	} while (0)

extern unsigned long m68k_memoffset;

#ifndef CONFIG_SUN3

#define WANT_PAGE_VIRTUAL

static inline unsigned long ___pa(void *vaddr)
{
	unsigned long paddr;
	asm (
		"1:	addl #0,%0\n"
		m68k_fixup(%c2, 1b+2)
		: "=r" (paddr)
		: "0" (vaddr), "i" (m68k_fixup_memoffset));
	return paddr;
}
#define __pa(vaddr)	___pa((void *)(long)(vaddr))
static inline void *__va(unsigned long paddr)
{
	void *vaddr;
	asm (
		"1:	subl #0,%0\n"
		m68k_fixup(%c2, 1b+2)
		: "=r" (vaddr)
		: "0" (paddr), "i" (m68k_fixup_memoffset));
	return vaddr;
}

Annotation

Implementation Notes