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