52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef __ASM_KASAN_H
|
||
|
|
#define __ASM_KASAN_H
|
||
|
|
|
||
|
|
#include <asm/pgtable.h>
|
||
|
|
|
||
|
|
#ifdef CONFIG_KASAN
|
||
|
|
|
||
|
|
#define KASAN_SHADOW_SCALE_SHIFT 3
|
||
|
|
#define KASAN_SHADOW_SIZE \
|
||
|
|
(_AC(1, UL) << (_REGION1_SHIFT - KASAN_SHADOW_SCALE_SHIFT))
|
||
|
|
#define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
|
||
|
|
#define KASAN_SHADOW_START KASAN_SHADOW_OFFSET
|
||
|
|
#define KASAN_SHADOW_END (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
|
||
|
|
|
||
|
|
extern void kasan_early_init(void);
|
||
|
|
extern void kasan_copy_shadow_mapping(void);
|
||
|
|
extern void kasan_free_early_identity(void);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Estimate kasan memory requirements, which it will reserve
|
||
|
|
* at the very end of available physical memory. To estimate
|
||
|
|
* that, we take into account that kasan would require
|
||
|
|
* 1/8 of available physical memory (for shadow memory) +
|
||
|
|
* creating page tables for the whole memory + shadow memory
|
||
|
|
* region (1 + 1/8). To keep page tables estimates simple take
|
||
|
|
* the double of combined ptes size.
|
||
|
|
*
|
||
|
|
* physmem parameter has to be already adjusted if not entire physical memory
|
||
|
|
* would be used (e.g. due to effect of "mem=" option).
|
||
|
|
*/
|
||
|
|
static inline unsigned long kasan_estimate_memory_needs(unsigned long physmem)
|
||
|
|
{
|
||
|
|
unsigned long kasan_needs;
|
||
|
|
unsigned long pages;
|
||
|
|
/* for shadow memory */
|
||
|
|
kasan_needs = round_up(physmem / 8, PAGE_SIZE);
|
||
|
|
/* for paging structures */
|
||
|
|
pages = DIV_ROUND_UP(physmem + kasan_needs, PAGE_SIZE);
|
||
|
|
kasan_needs += DIV_ROUND_UP(pages, _PAGE_ENTRIES) * _PAGE_TABLE_SIZE * 2;
|
||
|
|
|
||
|
|
return kasan_needs;
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
static inline void kasan_early_init(void) { }
|
||
|
|
static inline void kasan_copy_shadow_mapping(void) { }
|
||
|
|
static inline void kasan_free_early_identity(void) { }
|
||
|
|
static inline unsigned long kasan_estimate_memory_needs(unsigned long physmem) { return 0; }
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|