c10bc260e7
This helper should be used for setting permissions to the kernel mapping as it takes pointers as arguments and then avoids explicit cast to unsigned long needed for the set_memory_* API. Suggested-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Reviewed-by: Anup Patel <anup@brainfault.org> Reviewed-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Jisheng Zhang <jszhang@kernel.org> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2019 SiFive
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*/
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#ifndef _ASM_RISCV_SET_MEMORY_H
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#define _ASM_RISCV_SET_MEMORY_H
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#ifndef __ASSEMBLY__
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/*
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* Functions to change memory attributes.
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*/
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#ifdef CONFIG_MMU
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int set_memory_ro(unsigned long addr, int numpages);
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int set_memory_rw(unsigned long addr, int numpages);
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int set_memory_x(unsigned long addr, int numpages);
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int set_memory_nx(unsigned long addr, int numpages);
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int set_memory_rw_nx(unsigned long addr, int numpages);
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void protect_kernel_text_data(void);
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static __always_inline int set_kernel_memory(char *startp, char *endp,
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int (*set_memory)(unsigned long start,
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int num_pages))
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{
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unsigned long start = (unsigned long)startp;
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unsigned long end = (unsigned long)endp;
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int num_pages = PAGE_ALIGN(end - start) >> PAGE_SHIFT;
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return set_memory(start, num_pages);
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}
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#else
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static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
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static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
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static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
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static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
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static inline void protect_kernel_text_data(void) {}
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static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; }
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static inline int set_kernel_memory(char *startp, char *endp,
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int (*set_memory)(unsigned long start,
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int num_pages))
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{
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return 0;
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}
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#endif
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#if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)
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void protect_kernel_linear_mapping_text_rodata(void);
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#else
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static inline void protect_kernel_linear_mapping_text_rodata(void) {}
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#endif
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int set_direct_map_invalid_noflush(struct page *page);
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int set_direct_map_default_noflush(struct page *page);
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bool kernel_page_present(struct page *page);
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#endif /* __ASSEMBLY__ */
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#ifdef CONFIG_STRICT_KERNEL_RWX
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#ifdef CONFIG_64BIT
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#define SECTION_ALIGN (1 << 21)
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#else
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#define SECTION_ALIGN (1 << 22)
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#endif
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#else /* !CONFIG_STRICT_KERNEL_RWX */
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#define SECTION_ALIGN L1_CACHE_BYTES
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#endif /* CONFIG_STRICT_KERNEL_RWX */
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#endif /* _ASM_RISCV_SET_MEMORY_H */
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