arch/openrisc/include/asm/pgalloc.h

Source file repositories/reference/linux-study-clean/arch/openrisc/include/asm/pgalloc.h

File Facts

System
Linux kernel
Corpus path
arch/openrisc/include/asm/pgalloc.h
Extension
.h
Size
1711 bytes
Lines
71
Domain
Architecture Layer
Bucket
arch/openrisc
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_OPENRISC_PGALLOC_H
#define __ASM_OPENRISC_PGALLOC_H

#include <asm/page.h>
#include <linux/threads.h>
#include <linux/mm.h>
#include <linux/memblock.h>

#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
#include <asm-generic/pgalloc.h>

extern int mem_init_done;

#define pmd_populate_kernel(mm, pmd, pte) \
	set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
				struct page *pte)
{
	set_pmd(pmd, __pmd(_KERNPG_TABLE +
		     ((unsigned long)page_to_pfn(pte) <<
		     (unsigned long) PAGE_SHIFT)));
}

/*
 * Allocate and free page tables.
 */
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	pgd_t *ret = __pgd_alloc(mm, 0);

	if (ret)
		memcpy(ret + USER_PTRS_PER_PGD,
		       swapper_pg_dir + USER_PTRS_PER_PGD,
		       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));

	return ret;
}

#if 0
/* FIXME: This seems to be the preferred style, but we are using
 * current_pgd (from mm->pgd) to load kernel pages so we need it
 * initialized.  This needs to be looked into.
 */
extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	return (pgd_t *)get_zeroed_page(GFP_KERNEL);
}
#endif

extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm);

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

#endif

Annotation

Implementation Notes