forked from luck/tmp_suning_uos_patched
5e5419734c
(with Martin Schwidefsky <schwidefsky@de.ibm.com>) The pgd/pud/pmd/pte page table allocation functions get a mm_struct pointer as first argument. The free functions do not get the mm_struct argument. This is 1) asymmetrical and 2) to do mm related page table allocations the mm argument is needed on the free function as well. [kamalesh@linux.vnet.ibm.com: i386 fix] [akpm@linux-foundation.org: coding-syle fixes] Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
#ifndef _I386_PGALLOC_H
|
|
#define _I386_PGALLOC_H
|
|
|
|
#include <linux/threads.h>
|
|
#include <linux/mm.h> /* for struct page */
|
|
#include <linux/pagemap.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm-generic/tlb.h>
|
|
|
|
#ifdef CONFIG_PARAVIRT
|
|
#include <asm/paravirt.h>
|
|
#else
|
|
#define paravirt_alloc_pt(mm, pfn) do { } while (0)
|
|
#define paravirt_alloc_pd(mm, pfn) do { } while (0)
|
|
#define paravirt_alloc_pd_clone(pfn, clonepfn, start, count) do { } while (0)
|
|
#define paravirt_release_pt(pfn) do { } while (0)
|
|
#define paravirt_release_pd(pfn) do { } while (0)
|
|
#endif
|
|
|
|
static inline void pmd_populate_kernel(struct mm_struct *mm,
|
|
pmd_t *pmd, pte_t *pte)
|
|
{
|
|
paravirt_alloc_pt(mm, __pa(pte) >> PAGE_SHIFT);
|
|
set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
|
|
}
|
|
|
|
static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
|
|
{
|
|
unsigned long pfn = page_to_pfn(pte);
|
|
|
|
paravirt_alloc_pt(mm, pfn);
|
|
set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
|
|
}
|
|
|
|
/*
|
|
* Allocate and free page tables.
|
|
*/
|
|
extern pgd_t *pgd_alloc(struct mm_struct *);
|
|
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
|
|
|
|
extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
|
|
extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
|
|
|
|
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
|
|
{
|
|
free_page((unsigned long)pte);
|
|
}
|
|
|
|
static inline void pte_free(struct mm_struct *mm, struct page *pte)
|
|
{
|
|
__free_page(pte);
|
|
}
|
|
|
|
|
|
extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
/*
|
|
* In the PAE case we free the pmds as part of the pgd.
|
|
*/
|
|
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
|
|
}
|
|
|
|
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
|
|
{
|
|
BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
|
|
free_page((unsigned long)pmd);
|
|
}
|
|
|
|
extern void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
|
|
|
|
static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
|
|
{
|
|
paravirt_alloc_pd(mm, __pa(pmd) >> PAGE_SHIFT);
|
|
|
|
/* Note: almost everything apart from _PAGE_PRESENT is
|
|
reserved at the pmd (PDPT) level. */
|
|
set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT));
|
|
|
|
/*
|
|
* According to Intel App note "TLBs, Paging-Structure Caches,
|
|
* and Their Invalidation", April 2007, document 317080-001,
|
|
* section 8.1: in PAE mode we explicitly have to flush the
|
|
* TLB via cr3 if the top-level pgd is changed...
|
|
*/
|
|
if (mm == current->active_mm)
|
|
write_cr3(read_cr3());
|
|
}
|
|
#endif /* CONFIG_X86_PAE */
|
|
|
|
#endif /* _I386_PGALLOC_H */
|