arch/parisc/include/asm/kfence.h

Source file repositories/reference/linux-study-clean/arch/parisc/include/asm/kfence.h

File Facts

System
Linux kernel
Corpus path
arch/parisc/include/asm/kfence.h
Extension
.h
Size
865 bytes
Lines
45
Domain
Architecture Layer
Bucket
arch/parisc
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.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_PARISC_KFENCE_H
#define _ASM_PARISC_KFENCE_H

#include <linux/kfence.h>

#include <asm/pgtable.h>
#include <asm/tlbflush.h>

static inline bool arch_kfence_init_pool(void)
{
	return true;
}

/* Protect the given page and flush TLB. */
static inline bool kfence_protect_page(unsigned long addr, bool protect)
{
	pte_t *pte = virt_to_kpte(addr);

	if (WARN_ON(!pte))
		return false;

	/*
	 * We need to avoid IPIs, as we may get KFENCE allocations or faults
	 * with interrupts disabled.
	 */

	if (protect)
		set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_PRESENT));
	else
		set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT));

	flush_tlb_kernel_range(addr, addr + PAGE_SIZE);

	return true;
}

#endif /* _ASM_PARISC_KFENCE_H */

Annotation

Implementation Notes