arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h

File Facts

System

Linux kernel

Corpus path

arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h

Extension

.h

Size

1684 bytes

Lines

61

Domain

Architecture Layer

Bucket

arch/powerpc

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

• No C-style include directives detected by the generator.

Detected Declarations

• function flush_hugetlb_page
• function check_and_get_huge_psize
• function huge_ptep_get
• function huge_pte_clear
• function huge_ptep_set_wrprotect
• function arch_make_huge_pte

Annotated Snippet

#ifndef _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H
#define _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H

#define PAGE_SHIFT_8M		23

static inline void flush_hugetlb_page(struct vm_area_struct *vma,
				      unsigned long vmaddr)
{
	flush_tlb_page(vma, vmaddr);
}

static inline int check_and_get_huge_psize(int shift)
{
	return shift_to_mmu_psize(shift);
}

#define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
		     pte_t pte, unsigned long sz);

#define __HAVE_ARCH_HUGE_PTEP_GET
static inline pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
	if (ptep_is_8m_pmdp(mm, addr, ptep))
		ptep = pte_offset_kernel((pmd_t *)ptep, ALIGN_DOWN(addr, SZ_8M));
	return ptep_get(ptep);
}

#define __HAVE_ARCH_HUGE_PTE_CLEAR
static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
				  pte_t *ptep, unsigned long sz)
{
	pte_update(mm, addr, ptep, ~0UL, 0, 1);
}

#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
					   unsigned long addr, pte_t *ptep)
{
	unsigned long clr = ~pte_val(pte_wrprotect(__pte(~0)));
	unsigned long set = pte_val(pte_wrprotect(__pte(0)));

	pte_update(mm, addr, ptep, clr, set, 1);
}

#ifdef CONFIG_PPC_4K_PAGES
static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
{
	size_t size = 1UL << shift;

	if (size == SZ_16K)
		return __pte(pte_val(entry) | _PAGE_SPS);
	else
		return __pte(pte_val(entry) | _PAGE_SPS | _PAGE_HUGE);
}
#define arch_make_huge_pte arch_make_huge_pte
#endif

#endif /* _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H */

Annotation

• Detected declarations: `function flush_hugetlb_page`, `function check_and_get_huge_psize`, `function huge_ptep_get`, `function huge_pte_clear`, `function huge_ptep_set_wrprotect`, `function arch_make_huge_pte`.
• Atlas domain: Architecture Layer / arch/powerpc.
• 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.