arch/m68k/include/asm/sun3_pgalloc.h

Source file repositories/reference/linux-study-clean/arch/m68k/include/asm/sun3_pgalloc.h

File Facts

System
Linux kernel
Corpus path
arch/m68k/include/asm/sun3_pgalloc.h
Extension
.h
Size
1218 bytes
Lines
52
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 _SUN3_PGALLOC_H
#define _SUN3_PGALLOC_H

#include <asm/tlb.h>

#include <asm-generic/pgalloc.h>

extern const char bad_pmd_string[];

#define __pte_free_tlb(tlb, pte, addr)	\
	tlb_remove_ptdesc((tlb), page_ptdesc(pte))

static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
{
	pmd_val(*pmd) = __pa((unsigned long)pte);
}

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
{
	pmd_val(*pmd) = __pa((unsigned long)page_address(page));
}

/*
 * allocating and freeing a pmd is trivial: the 1-entry pmd is
 * inside the pgd, so has no extra memory associated with it.
 */
#define pmd_free(mm, x)			do { } while (0)

static inline pgd_t * pgd_alloc(struct mm_struct *mm)
{
	pgd_t *new_pgd;

	new_pgd = __pgd_alloc(mm, 0);
	if (likely(new_pgd != NULL)) {
		memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
		memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
	}
	return new_pgd;
}

#endif /* SUN3_PGALLOC_H */

Annotation

Implementation Notes