Unverified Commit c10bc260 authored by Alexandre Ghiti's avatar Alexandre Ghiti Committed by Palmer Dabbelt
Browse files

riscv: Introduce set_kernel_memory helper 



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: default avatarChristoph Hellwig <hch@infradead.org>
Signed-off-by: default avatarAlexandre Ghiti <alex@ghiti.fr>
Reviewed-by: default avatarAnup Patel <anup@brainfault.org>
Reviewed-by: default avatarAtish Patra <atish.patra@wdc.com>
Reviewed-by: default avatarJisheng Zhang <jszhang@kernel.org>
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent 7094e6ac

arch/riscv/include/asm/set_memory.h

+16 −0
Original line number Diff line number Diff line
@@ -17,6 +17,16 @@ int set_memory_x(unsigned long addr, int numpages); 
int set_memory_nx(unsigned long addr, int numpages);

int set_memory_rw_nx(unsigned long addr, int numpages);

void protect_kernel_text_data(void);

static __always_inline int set_kernel_memory(char *startp, char *endp,

					     int (*set_memory)(unsigned long start,

							       int num_pages))

{

	unsigned long start = (unsigned long)startp;

	unsigned long end = (unsigned long)endp;

	int num_pages = PAGE_ALIGN(end - start) >> PAGE_SHIFT;



	return set_memory(start, num_pages);

}

#else

static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }

static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
@@ -24,6 +34,12 @@ static inline int set_memory_x(unsigned long addr, int numpages) { return 0; } 
static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }

static inline void protect_kernel_text_data(void) {}

static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; }

static inline int set_kernel_memory(char *startp, char *endp,

				    int (*set_memory)(unsigned long start,

						      int num_pages))

{

	return 0;

}

#endif



#if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)