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