arch/loongarch/include/asm/page.h

Source file repositories/reference/linux-study-clean/arch/loongarch/include/asm/page.h

File Facts

System
Linux kernel
Corpus path
arch/loongarch/include/asm/page.h
Extension
.h
Size
2895 bytes
Lines
111
Domain
Architecture Layer
Bucket
arch/loongarch
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_PAGE_H
#define _ASM_PAGE_H

#include <linux/const.h>
#include <asm/addrspace.h>

#include <vdso/page.h>

#define HPAGE_SHIFT	(PAGE_SHIFT + PAGE_SHIFT - PTRLOG)
#define HPAGE_SIZE	(_AC(1, UL) << HPAGE_SHIFT)
#define HPAGE_MASK	(~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)

#ifndef __ASSEMBLER__

#include <linux/kernel.h>
#include <linux/pfn.h>

/*
 * It's normally defined only for FLATMEM config but it's
 * used in our early mem init code for all memory models.
 * So always define it.
 */
#define ARCH_PFN_OFFSET	PFN_UP(PHYS_OFFSET)

extern void clear_page(void *page);
extern void copy_page(void *to, void *from);

#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)

extern unsigned long shm_align_mask;

struct page;
struct vm_area_struct;

typedef struct { unsigned long pte; } pte_t;
#define pte_val(x)	((x).pte)
#define __pte(x)	((pte_t) { (x) })
typedef struct page *pgtable_t;

typedef struct { unsigned long pgd; } pgd_t;
#define pgd_val(x)	((x).pgd)
#define __pgd(x)	((pgd_t) { (x) })

/*
 * Manipulate page protection bits
 */
typedef struct { unsigned long pgprot; } pgprot_t;
#define pgprot_val(x)	((x).pgprot)
#define __pgprot(x)	((pgprot_t) { (x) })
#define pte_pgprot(x)	__pgprot(pte_val(x) & ~_PFN_MASK)

#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))

/*
 * __pa()/__va() should be used only during mem init.
 */
#define __pa(x)		PHYSADDR(x)
#define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))

#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
#define sym_to_pfn(x)		__phys_to_pfn(__pa_symbol(x))

struct page *dmw_virt_to_page(unsigned long kaddr);
struct page *tlb_virt_to_page(unsigned long kaddr);

#define pfn_to_phys(pfn)	__pfn_to_phys(pfn)
#define phys_to_pfn(paddr)	__phys_to_pfn(paddr)

#ifndef CONFIG_KFENCE

#define page_to_virt(page)	__va(page_to_phys(page))
#define virt_to_page(kaddr)	phys_to_page(__pa(kaddr))

#else

#define WANT_PAGE_VIRTUAL

#define page_to_virt(page)								\
({											\
	extern char *__kfence_pool;							\
	(__kfence_pool == NULL) ? __va(page_to_phys(page)) : page_address(page);	\
})

#define virt_to_page(kaddr)								\
({											\
	(likely((unsigned long)kaddr < vm_map_base)) ?					\
	dmw_virt_to_page((unsigned long)kaddr) : tlb_virt_to_page((unsigned long)kaddr);\
})

Annotation

Implementation Notes