arch/riscv/include/asm/kfence.h

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

File Facts

System
Linux kernel
Corpus path
arch/riscv/include/asm/kfence.h
Extension
.h
Size
735 bytes
Lines
36
Domain
Architecture Layer
Bucket
arch/riscv
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_RISCV_KFENCE_H
#define _ASM_RISCV_KFENCE_H

#include <linux/kfence.h>
#include <linux/pfn.h>
#include <asm-generic/pgalloc.h>
#include <asm/cacheflush.h>
#include <asm/pgtable.h>

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

static inline bool kfence_protect_page(unsigned long addr, bool protect)
{
	pte_t *pte = virt_to_kpte(addr);

	if (protect) {
		set_pte(pte, __pte(pte_val(ptep_get(pte)) & ~_PAGE_PRESENT));
	} else {
		set_pte(pte, __pte(pte_val(ptep_get(pte)) | _PAGE_PRESENT));
		mark_new_valid_map();
	}

	preempt_disable();
	local_flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
	preempt_enable();

	return true;
}

#endif /* _ASM_RISCV_KFENCE_H */

Annotation

Implementation Notes