43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_S390_KFENCE_H
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#define _ASM_S390_KFENCE_H
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#include <linux/mm.h>
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#include <linux/kfence.h>
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#include <asm/set_memory.h>
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#include <asm/page.h>
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void __kernel_map_pages(struct page *page, int numpages, int enable);
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static __always_inline bool arch_kfence_init_pool(void)
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{
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return true;
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}
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#define arch_kfence_test_address(addr) ((addr) & PAGE_MASK)
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/*
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* Do not split kfence pool to 4k mapping with arch_kfence_init_pool(),
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* but earlier where page table allocations still happen with memblock.
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* Reason is that arch_kfence_init_pool() gets called when the system
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* is still in a limbo state - disabling and enabling bottom halves is
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* not yet allowed, but that is what our page_table_alloc() would do.
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*/
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static __always_inline void kfence_split_mapping(void)
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{
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#ifdef CONFIG_KFENCE
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unsigned long pool_pages = KFENCE_POOL_SIZE >> PAGE_SHIFT;
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set_memory_4k((unsigned long)__kfence_pool, pool_pages);
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#endif
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}
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static inline bool kfence_protect_page(unsigned long addr, bool protect)
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{
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__kernel_map_pages(virt_to_page(addr), 1, !protect);
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return true;
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}
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#endif /* _ASM_S390_KFENCE_H */
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