arch/riscv/mm/pgtable.c

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

File Facts

System
Linux kernel
Corpus path
arch/riscv/mm/pgtable.c
Extension
.c
Size
4111 bytes
Lines
183
Domain
Architecture Layer
Bucket
arch/riscv
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

if (!pte_same(ptep_get(ptep), entry)) {
			__set_pte_at(vma->vm_mm, ptep, entry);
			/* Here only not svadu is impacted */
			flush_tlb_page(vma, address);
			return true;
		}

		return false;
	}

	if (!pte_same(ptep_get(ptep), entry))
		__set_pte_at(vma->vm_mm, ptep, entry);
	/*
	 * update_mmu_cache will unconditionally execute, handling both
	 * the case that the PTE changed and the spurious fault case.
	 */
	return true;
}

bool ptep_test_and_clear_young(struct vm_area_struct *vma,
		unsigned long address, pte_t *ptep)
{
	if (!pte_young(ptep_get(ptep)))
		return false;
	return test_and_clear_bit(_PAGE_ACCESSED_OFFSET, &pte_val(*ptep));
}
EXPORT_SYMBOL_GPL(ptep_test_and_clear_young);

#ifdef CONFIG_64BIT
pud_t *pud_offset(p4d_t *p4d, unsigned long address)
{
	if (pgtable_l4_enabled)
		return p4d_pgtable(p4dp_get(p4d)) + pud_index(address);

	return (pud_t *)p4d;
}
EXPORT_SYMBOL_GPL(pud_offset);

p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
{
	if (pgtable_l5_enabled)
		return pgd_pgtable(pgdp_get(pgd)) + p4d_index(address);

	return (p4d_t *)pgd;
}
EXPORT_SYMBOL_GPL(p4d_offset);
#endif

#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
{
	return 0;
}

void p4d_clear_huge(p4d_t *p4d)
{
}

int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot)
{
	pud_t new_pud = pfn_pud(__phys_to_pfn(phys), prot);

	set_pud(pud, new_pud);
	return 1;
}

int pud_clear_huge(pud_t *pud)
{
	if (!pud_leaf(pudp_get(pud)))
		return 0;
	pud_clear(pud);
	return 1;
}

int pud_free_pmd_page(pud_t *pud, unsigned long addr)
{
	pmd_t *pmd = pud_pgtable(pudp_get(pud));
	int i;

	pud_clear(pud);

	flush_tlb_kernel_range(addr, addr + PUD_SIZE);

	for (i = 0; i < PTRS_PER_PMD; i++) {
		if (!pmd_none(pmd[i])) {
			pte_t *pte = (pte_t *)pmd_page_vaddr(pmd[i]);

			pte_free_kernel(NULL, pte);
		}
	}

Annotation

Implementation Notes