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.
- CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
Dependency Surface
linux/compiler.hasm/module.h
Detected Declarations
function copy_pagefunction clear_pagefunction ___pafunction ___pafunction virt_to_pfn
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
- Immediate include surface: `linux/compiler.h`, `asm/module.h`.
- Detected declarations: `function copy_page`, `function clear_page`, `function ___pa`, `function ___pa`, `function virt_to_pfn`.
- Atlas domain: Architecture Layer / arch/m68k.
- 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.