arch/powerpc/include/asm/nohash/pgalloc.h

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

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/nohash/pgalloc.h
Extension
.h
Size
1956 bytes
Lines
77
Domain
Architecture Layer
Bucket
arch/powerpc
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_POWERPC_NOHASH_PGALLOC_H
#define _ASM_POWERPC_NOHASH_PGALLOC_H

#include <linux/mm.h>
#include <linux/slab.h>

extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
#ifdef CONFIG_PPC64
extern void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address);
#else
/* 44x etc which is BOOKE not BOOK3E */
static inline void tlb_flush_pgtable(struct mmu_gather *tlb,
				     unsigned long address)
{

}
#endif /* !CONFIG_PPC_BOOK3E_64 */

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	pgd_t *pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
			pgtable_gfp_flags(mm, GFP_KERNEL));

#ifdef CONFIG_PPC_8xx
	memcpy(pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD,
	       (MAX_PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
#endif
	return pgd;
}

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
}

#ifdef CONFIG_PPC64
#include <asm/nohash/64/pgalloc.h>
#else
#include <asm/nohash/32/pgalloc.h>
#endif

static inline void pgtable_free(void *table, int shift)
{
	if (!shift) {
		pte_fragment_free((unsigned long *)table, 0);
	} else {
		BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
		kmem_cache_free(PGT_CACHE(shift), table);
	}
}

static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift)
{
	unsigned long pgf = (unsigned long)table;

	BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
	pgf |= shift;
	tlb_remove_table(tlb, (void *)pgf);
}

static inline void __tlb_remove_table(void *_table)
{
	void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
	unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;

	pgtable_free(table, shift);
}

static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
				  unsigned long address)
{
	tlb_flush_pgtable(tlb, address);
	pgtable_free_tlb(tlb, table, 0);
}
#endif /* _ASM_POWERPC_NOHASH_PGALLOC_H */

Annotation

Implementation Notes