arch/mips/mm/pgtable-64.c

Source file repositories/reference/linux-study-clean/arch/mips/mm/pgtable-64.c

File Facts

System
Linux kernel
Corpus path
arch/mips/mm/pgtable-64.c
Extension
.c
Size
2385 bytes
Lines
120
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration 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

#include <linux/export.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <asm/fixmap.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>

void pgd_init(void *addr)
{
	unsigned long *p, *end;
	unsigned long entry;

#if !defined(__PAGETABLE_PUD_FOLDED)
	entry = (unsigned long)invalid_pud_table;
#elif !defined(__PAGETABLE_PMD_FOLDED)
	entry = (unsigned long)invalid_pmd_table;
#else
	entry = (unsigned long)invalid_pte_table;
#endif

	p = (unsigned long *) addr;
	end = p + PTRS_PER_PGD;

	do {
		p[0] = entry;
		p[1] = entry;
		p[2] = entry;
		p[3] = entry;
		p[4] = entry;
		p += 8;
		p[-3] = entry;
		p[-2] = entry;
		p[-1] = entry;
	} while (p != end);
}

#ifndef __PAGETABLE_PMD_FOLDED
void pmd_init(void *addr)
{
	unsigned long *p, *end;
	unsigned long pagetable = (unsigned long)invalid_pte_table;

	p = (unsigned long *)addr;
	end = p + PTRS_PER_PMD;

	do {
		p[0] = pagetable;
		p[1] = pagetable;
		p[2] = pagetable;
		p[3] = pagetable;
		p[4] = pagetable;
		p += 8;
		p[-3] = pagetable;
		p[-2] = pagetable;
		p[-1] = pagetable;
	} while (p != end);
}
EXPORT_SYMBOL_GPL(pmd_init);
#endif

#ifndef __PAGETABLE_PUD_FOLDED
void pud_init(void *addr)
{
	unsigned long *p, *end;
	unsigned long pagetable = (unsigned long)invalid_pmd_table;

	p = (unsigned long *)addr;
	end = p + PTRS_PER_PUD;

	do {
		p[0] = pagetable;
		p[1] = pagetable;
		p[2] = pagetable;
		p[3] = pagetable;
		p[4] = pagetable;
		p += 8;
		p[-3] = pagetable;
		p[-2] = pagetable;
		p[-1] = pagetable;
	} while (p != end);
}
#endif

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void set_pmd_at(struct mm_struct *mm, unsigned long addr,
		pmd_t *pmdp, pmd_t pmd)
{
	*pmdp = pmd;
}
#endif

Annotation

Implementation Notes