18ad8b727SNick Hu /* SPDX-License-Identifier: GPL-2.0 */ 28ad8b727SNick Hu /* Copyright (C) 2019 Andes Technology Corporation */ 38ad8b727SNick Hu 48ad8b727SNick Hu #ifndef __ASM_KASAN_H 58ad8b727SNick Hu #define __ASM_KASAN_H 68ad8b727SNick Hu 78ad8b727SNick Hu #ifndef __ASSEMBLY__ 88ad8b727SNick Hu 98ad8b727SNick Hu #ifdef CONFIG_KASAN 108ad8b727SNick Hu 117899ed26SAlexandre Ghiti /* 127899ed26SAlexandre Ghiti * The following comment was copied from arm64: 137899ed26SAlexandre Ghiti * KASAN_SHADOW_START: beginning of the kernel virtual addresses. 147899ed26SAlexandre Ghiti * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses, 157899ed26SAlexandre Ghiti * where N = (1 << KASAN_SHADOW_SCALE_SHIFT). 167899ed26SAlexandre Ghiti * 177899ed26SAlexandre Ghiti * KASAN_SHADOW_OFFSET: 187899ed26SAlexandre Ghiti * This value is used to map an address to the corresponding shadow 197899ed26SAlexandre Ghiti * address by the following formula: 207899ed26SAlexandre Ghiti * shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET 217899ed26SAlexandre Ghiti * 227899ed26SAlexandre Ghiti * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range 237899ed26SAlexandre Ghiti * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual 247899ed26SAlexandre Ghiti * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation: 257899ed26SAlexandre Ghiti * KASAN_SHADOW_OFFSET = KASAN_SHADOW_END - 267899ed26SAlexandre Ghiti * (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT)) 277899ed26SAlexandre Ghiti */ 288ad8b727SNick Hu #define KASAN_SHADOW_SCALE_SHIFT 3 298ad8b727SNick Hu 303270bfdbSAlexandre Ghiti #define KASAN_SHADOW_SIZE (UL(1) << ((VA_BITS - 1) - KASAN_SHADOW_SCALE_SHIFT)) 31*e8a62cc2SAlexandre Ghiti /* 32*e8a62cc2SAlexandre Ghiti * Depending on the size of the virtual address space, the region may not be 33*e8a62cc2SAlexandre Ghiti * aligned on PGDIR_SIZE, so force its alignment to ease its population. 34*e8a62cc2SAlexandre Ghiti */ 35*e8a62cc2SAlexandre Ghiti #define KASAN_SHADOW_START ((KASAN_SHADOW_END - KASAN_SHADOW_SIZE) & PGDIR_MASK) 36f7ae0233SAlexandre Ghiti #define KASAN_SHADOW_END MODULES_LOWEST_VADDR 3754c5639dSAlexandre Ghiti #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL) 388ad8b727SNick Hu 398ad8b727SNick Hu void kasan_init(void); 408ad8b727SNick Hu asmlinkage void kasan_early_init(void); 412efad17eSAlexandre Ghiti void kasan_swapper_init(void); 428ad8b727SNick Hu 438ad8b727SNick Hu #endif 448ad8b727SNick Hu #endif 458ad8b727SNick Hu #endif /* __ASM_KASAN_H */ 46