arch/powerpc/include/asm/pgtable.h

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

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/pgtable.h
Extension
.h
Size
5998 bytes
Lines
226
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

static inline void mark_initmem_nx(void) { }
#endif

#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
			  pte_t *ptep, pte_t entry, int dirty);

pgprot_t __phys_mem_access_prot(unsigned long pfn, unsigned long size,
				pgprot_t vma_prot);

struct file;
static inline pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
					    unsigned long size, pgprot_t vma_prot)
{
	return __phys_mem_access_prot(pfn, size, vma_prot);
}
#define __HAVE_PHYS_MEM_ACCESS_PROT

void __update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep);

/*
 * This gets called at the end of handling a page fault, when
 * the kernel has put a new PTE into the page table for the process.
 * We use it to ensure coherency between the i-cache and d-cache
 * for the page which has just been mapped in.
 * On machines which use an MMU hash table, we use this to put a
 * corresponding HPTE into the hash table ahead of time, instead of
 * waiting for the inevitable extra hash-table miss exception.
 */
static inline void update_mmu_cache_range(struct vm_fault *vmf,
		struct vm_area_struct *vma, unsigned long address,
		pte_t *ptep, unsigned int nr)
{
	if ((mmu_has_feature(MMU_FTR_HPTE_TABLE) && !radix_enabled()) ||
	    (IS_ENABLED(CONFIG_PPC_E500) && IS_ENABLED(CONFIG_HUGETLB_PAGE)))
		__update_mmu_cache(vma, address, ptep);
}

/*
 * When used, PTE_FRAG_NR is defined in subarch pgtable.h
 * so we are sure it is included when arriving here.
 */
#ifdef PTE_FRAG_NR
static inline void *pte_frag_get(mm_context_t *ctx)
{
	return ctx->pte_frag;
}

static inline void pte_frag_set(mm_context_t *ctx, void *p)
{
	ctx->pte_frag = p;
}
#else
#define PTE_FRAG_NR		1
#define PTE_FRAG_SIZE_SHIFT	PAGE_SHIFT
#define PTE_FRAG_SIZE		(1UL << PTE_FRAG_SIZE_SHIFT)

static inline void *pte_frag_get(mm_context_t *ctx)
{
	return NULL;
}

static inline void pte_frag_set(mm_context_t *ctx, void *p)
{
}
#endif

#define pmd_pgtable pmd_pgtable
static inline pgtable_t pmd_pgtable(pmd_t pmd)
{
	return (pgtable_t)pmd_page_vaddr(pmd);
}

#ifdef CONFIG_PPC64
int __meminit vmemmap_populated(unsigned long vmemmap_addr, int vmemmap_map_size);
bool altmap_cross_boundary(struct vmem_altmap *altmap, unsigned long start,
			   unsigned long page_size);
/*
 * mm/memory_hotplug.c:mhp_supports_memmap_on_memory goes into details
 * some of the restrictions. We don't check for PMD_SIZE because our
 * vmemmap allocation code can fallback correctly. The pageblock
 * alignment requirement is met using altmap->reserve blocks.
 */
#define arch_supports_memmap_on_memory arch_supports_memmap_on_memory
static inline bool arch_supports_memmap_on_memory(unsigned long vmemmap_size)
{
	if (!radix_enabled())
		return false;
	/*
	 * With 4K page size and 2M PMD_SIZE, we can align

Annotation

Implementation Notes