48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
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/* 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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/*
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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 shadow memory region.
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* To keep page tables estimates simple take the double of
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* 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(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 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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