arch/openrisc/include/asm/pgtable.h

File Facts

System

Linux kernel

Corpus path

arch/openrisc/include/asm/pgtable.h

Extension

.h

Size

12446 bytes

Lines

414

Domain

Architecture Layer

Bucket

arch/openrisc

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.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• asm-generic/pgtable-nopmd.h
• asm/mmu.h
• asm/fixmap.h

Detected Declarations

• struct vm_area_struct
• function pte_present
• function pte_write
• function pte_exec
• function pte_dirty
• function pte_young
• function pte_wrprotect
• function pte_rdprotect
• function pte_exprotect
• function pte_mkclean
• function pte_mkold
• function pte_mkwrite_novma
• function pte_mkread
• function pte_mkexec
• function pte_mkdirty
• function pte_mkyoung
• function addresses
• function pte_modify
• function __pte_page
• function pmd_set
• function pmd_page_vaddr
• function update_tlb
• function update_mmu_cache_range
• function pte_swp_exclusive
• function pte_swp_mkexclusive
• function pte_swp_clear_exclusive

Annotated Snippet

static inline int pte_read(pte_t pte)  { return pte_val(pte) & _PAGE_READ; }
static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
static inline int pte_exec(pte_t pte)  { return pte_val(pte) & _PAGE_EXEC; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }

static inline pte_t pte_wrprotect(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_WRITE);
	return pte;
}

static inline pte_t pte_rdprotect(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_READ);
	return pte;
}

static inline pte_t pte_exprotect(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_EXEC);
	return pte;
}

static inline pte_t pte_mkclean(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_DIRTY);
	return pte;
}

static inline pte_t pte_mkold(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_ACCESSED);
	return pte;
}

static inline pte_t pte_mkwrite_novma(pte_t pte)
{
	pte_val(pte) |= _PAGE_WRITE;
	return pte;
}

static inline pte_t pte_mkread(pte_t pte)
{
	pte_val(pte) |= _PAGE_READ;
	return pte;
}

static inline pte_t pte_mkexec(pte_t pte)
{
	pte_val(pte) |= _PAGE_EXEC;
	return pte;
}

static inline pte_t pte_mkdirty(pte_t pte)
{
	pte_val(pte) |= _PAGE_DIRTY;
	return pte;
}

static inline pte_t pte_mkyoung(pte_t pte)
{
	pte_val(pte) |= _PAGE_ACCESSED;
	return pte;
}

/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */

/* What actually goes as arguments to the various functions is less than
 * obvious, but a rule of thumb is that struct page's goes as struct page *,
 * really physical DRAM addresses are unsigned long's, and DRAM "virtual"
 * addresses (the 0xc0xxxxxx's) goes as void *'s.
 */

static inline pte_t __mk_pte(void *page, pgprot_t pgprot)
{
	pte_t pte;
	/* the PTE needs a physical address */
	pte_val(pte) = __pa(page) | pgprot_val(pgprot);
	return pte;
}

#define mk_pte_phys(physpage, pgprot) \
({                                                                      \
	pte_t __pte;                                                    \
									\
	pte_val(__pte) = (physpage) + pgprot_val(pgprot);               \

Annotation

• Immediate include surface: `asm-generic/pgtable-nopmd.h`, `asm/mmu.h`, `asm/fixmap.h`.
• Detected declarations: `struct vm_area_struct`, `function pte_present`, `function pte_write`, `function pte_exec`, `function pte_dirty`, `function pte_young`, `function pte_wrprotect`, `function pte_rdprotect`, `function pte_exprotect`, `function pte_mkclean`.
• Atlas domain: Architecture Layer / arch/openrisc.
• 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.