[mirror_ubuntu-jammy-kernel.git] / arch / riscv / include / asm / kasan.h

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2019 Andes Technology Corporation */

#ifndef __ASM_KASAN_H
#define __ASM_KASAN_H

#ifndef __ASSEMBLY__

#ifdef CONFIG_KASAN

/*
 * The following comment was copied from arm64:
 * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
 * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
 * where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
 *
 * KASAN_SHADOW_OFFSET:
 * This value is used to map an address to the corresponding shadow
 * address by the following formula:
 *     shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
 *
 * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
 * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
 * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
 *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
 *                              (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
 */
#define KASAN_SHADOW_SCALE_SHIFT	3

#define KASAN_SHADOW_SIZE	(UL(1) << ((CONFIG_VA_BITS - 1) - KASAN_SHADOW_SCALE_SHIFT))
#define KASAN_SHADOW_START	KERN_VIRT_START
#define KASAN_SHADOW_END	(KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
#define KASAN_SHADOW_OFFSET	(KASAN_SHADOW_END - (1ULL << \
					(64 - KASAN_SHADOW_SCALE_SHIFT)))

void kasan_init(void);
asmlinkage void kasan_early_init(void);

#endif
#endif
#endif /* __ASM_KASAN_H */
Commit	Line	Data
8ad8b727 NH	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/* Copyright (C) 2019 Andes Technology Corporation */
	3
	4	#ifndef __ASM_KASAN_H
	5	#define __ASM_KASAN_H
	6
	7	#ifndef __ASSEMBLY__
	8
	9	#ifdef CONFIG_KASAN
	10
7899ed26 AG	11	/*
	12	* The following comment was copied from arm64:
	13	* KASAN_SHADOW_START: beginning of the kernel virtual addresses.
	14	* KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
	15	* where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
	16	*
	17	* KASAN_SHADOW_OFFSET:
	18	* This value is used to map an address to the corresponding shadow
	19	* address by the following formula:
	20	* shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
	21	*
	22	* (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
	23	* [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
	24	* addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
	25	* KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
	26	* (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
	27	*/
8ad8b727 NH	28	#define KASAN_SHADOW_SCALE_SHIFT 3
8ad8b727 NH	29
7899ed26 AG	30	#define KASAN_SHADOW_SIZE (UL(1) << ((CONFIG_VA_BITS - 1) - KASAN_SHADOW_SCALE_SHIFT))
7899ed26 AG	31	#define KASAN_SHADOW_START KERN_VIRT_START
8ad8b727	32	#define KASAN_SHADOW_END (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
8ad8b727 NH	33	#define KASAN_SHADOW_OFFSET (KASAN_SHADOW_END - (1ULL << \
	34	(64 - KASAN_SHADOW_SCALE_SHIFT)))
	35
	36	void kasan_init(void);
	37	asmlinkage void kasan_early_init(void);
	38
	39	#endif
	40	#endif
	41	#endif /* __ASM_KASAN_H */