188 строки
4.6 KiB
C
188 строки
4.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __ASM_GENERIC_PGALLOC_H
|
|
#define __ASM_GENERIC_PGALLOC_H
|
|
|
|
#ifdef CONFIG_MMU
|
|
|
|
#define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO)
|
|
#define GFP_PGTABLE_USER (GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
|
|
|
|
/**
|
|
* __pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
|
|
* @mm: the mm_struct of the current context
|
|
*
|
|
* This function is intended for architectures that need
|
|
* anything beyond simple page allocation.
|
|
*
|
|
* Return: pointer to the allocated memory or %NULL on error
|
|
*/
|
|
static inline pte_t *__pte_alloc_one_kernel(struct mm_struct *mm)
|
|
{
|
|
return (pte_t *)__get_free_page(GFP_PGTABLE_KERNEL);
|
|
}
|
|
|
|
#ifndef __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
|
|
/**
|
|
* pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
|
|
* @mm: the mm_struct of the current context
|
|
*
|
|
* Return: pointer to the allocated memory or %NULL on error
|
|
*/
|
|
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
|
|
{
|
|
return __pte_alloc_one_kernel(mm);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* pte_free_kernel - free PTE-level kernel page table page
|
|
* @mm: the mm_struct of the current context
|
|
* @pte: pointer to the memory containing the page table
|
|
*/
|
|
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
|
|
{
|
|
free_page((unsigned long)pte);
|
|
}
|
|
|
|
/**
|
|
* __pte_alloc_one - allocate a page for PTE-level user page table
|
|
* @mm: the mm_struct of the current context
|
|
* @gfp: GFP flags to use for the allocation
|
|
*
|
|
* Allocates a page and runs the pgtable_pte_page_ctor().
|
|
*
|
|
* This function is intended for architectures that need
|
|
* anything beyond simple page allocation or must have custom GFP flags.
|
|
*
|
|
* Return: `struct page` initialized as page table or %NULL on error
|
|
*/
|
|
static inline pgtable_t __pte_alloc_one(struct mm_struct *mm, gfp_t gfp)
|
|
{
|
|
struct page *pte;
|
|
|
|
pte = alloc_page(gfp);
|
|
if (!pte)
|
|
return NULL;
|
|
if (!pgtable_pte_page_ctor(pte)) {
|
|
__free_page(pte);
|
|
return NULL;
|
|
}
|
|
|
|
return pte;
|
|
}
|
|
|
|
#ifndef __HAVE_ARCH_PTE_ALLOC_ONE
|
|
/**
|
|
* pte_alloc_one - allocate a page for PTE-level user page table
|
|
* @mm: the mm_struct of the current context
|
|
*
|
|
* Allocates a page and runs the pgtable_pte_page_ctor().
|
|
*
|
|
* Return: `struct page` initialized as page table or %NULL on error
|
|
*/
|
|
static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
|
|
{
|
|
return __pte_alloc_one(mm, GFP_PGTABLE_USER);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Should really implement gc for free page table pages. This could be
|
|
* done with a reference count in struct page.
|
|
*/
|
|
|
|
/**
|
|
* pte_free - free PTE-level user page table page
|
|
* @mm: the mm_struct of the current context
|
|
* @pte_page: the `struct page` representing the page table
|
|
*/
|
|
static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
|
|
{
|
|
pgtable_pte_page_dtor(pte_page);
|
|
__free_page(pte_page);
|
|
}
|
|
|
|
|
|
#if CONFIG_PGTABLE_LEVELS > 2
|
|
|
|
#ifndef __HAVE_ARCH_PMD_ALLOC_ONE
|
|
/**
|
|
* pmd_alloc_one - allocate a page for PMD-level page table
|
|
* @mm: the mm_struct of the current context
|
|
*
|
|
* Allocates a page and runs the pgtable_pmd_page_ctor().
|
|
* Allocations use %GFP_PGTABLE_USER in user context and
|
|
* %GFP_PGTABLE_KERNEL in kernel context.
|
|
*
|
|
* Return: pointer to the allocated memory or %NULL on error
|
|
*/
|
|
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
struct page *page;
|
|
gfp_t gfp = GFP_PGTABLE_USER;
|
|
|
|
if (mm == &init_mm)
|
|
gfp = GFP_PGTABLE_KERNEL;
|
|
page = alloc_pages(gfp, 0);
|
|
if (!page)
|
|
return NULL;
|
|
if (!pgtable_pmd_page_ctor(page)) {
|
|
__free_pages(page, 0);
|
|
return NULL;
|
|
}
|
|
return (pmd_t *)page_address(page);
|
|
}
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_PMD_FREE
|
|
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
|
|
{
|
|
BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
|
|
pgtable_pmd_page_dtor(virt_to_page(pmd));
|
|
free_page((unsigned long)pmd);
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_PGTABLE_LEVELS > 2 */
|
|
|
|
#if CONFIG_PGTABLE_LEVELS > 3
|
|
|
|
#ifndef __HAVE_ARCH_PUD_FREE
|
|
/**
|
|
* pud_alloc_one - allocate a page for PUD-level page table
|
|
* @mm: the mm_struct of the current context
|
|
*
|
|
* Allocates a page using %GFP_PGTABLE_USER for user context and
|
|
* %GFP_PGTABLE_KERNEL for kernel context.
|
|
*
|
|
* Return: pointer to the allocated memory or %NULL on error
|
|
*/
|
|
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
gfp_t gfp = GFP_PGTABLE_USER;
|
|
|
|
if (mm == &init_mm)
|
|
gfp = GFP_PGTABLE_KERNEL;
|
|
return (pud_t *)get_zeroed_page(gfp);
|
|
}
|
|
#endif
|
|
|
|
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
|
|
{
|
|
BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
|
|
free_page((unsigned long)pud);
|
|
}
|
|
|
|
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
|
|
|
|
#ifndef __HAVE_ARCH_PGD_FREE
|
|
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
|
|
{
|
|
free_page((unsigned long)pgd);
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_MMU */
|
|
|
|
#endif /* __ASM_GENERIC_PGALLOC_H */
|