From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/s390/include/asm/kasan.h | 51 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 arch/s390/include/asm/kasan.h (limited to 'arch/s390/include/asm/kasan.h') diff --git a/arch/s390/include/asm/kasan.h b/arch/s390/include/asm/kasan.h new file mode 100644 index 000000000..2768d5db1 --- /dev/null +++ b/arch/s390/include/asm/kasan.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_KASAN_H +#define __ASM_KASAN_H + +#include + +#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 -- cgit v1.2.3