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.
- CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/const.hasm/addrspace.hvdso/page.hlinux/kernel.hlinux/pfn.hasm-generic/memory_model.hasm-generic/getorder.h
Detected Declarations
struct pagestruct vm_area_struct
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
- Immediate include surface: `linux/const.h`, `asm/addrspace.h`, `vdso/page.h`, `linux/kernel.h`, `linux/pfn.h`, `asm-generic/memory_model.h`, `asm-generic/getorder.h`.
- Detected declarations: `struct page`, `struct vm_area_struct`.
- Atlas domain: Architecture Layer / arch/loongarch.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.