From ff0a979fc3591dcfb28585ae97ed4078a3ed5ef4 Mon Sep 17 00:00:00 2001 From: Ilias Apalodimas Date: Thu, 20 Feb 2025 15:54:41 +0200 Subject: arm64: mmu_change_region_attr() add an option not to break PTEs The ARM ARM (Rev L.a) on section 8.17.1 describes the cases where break-before-make is required when changing live page tables. Since we can use a function to tweak block and page permissions, where BBM is not required split the existing mmu_change_region_attr() into two functions and create one that doesn't require BBM. Subsequent patches will use the new function to map the U-Boot binary with proper page permissions. While at it add function descriptions in their header files. Signed-off-by: Ilias Apalodimas --- arch/arm/include/asm/system.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'arch/arm/include/asm/system.h') diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 091082281c7..849b3d0efb7 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -303,8 +303,26 @@ void flush_l3_cache(void); * @emerg: Also map the region in the emergency table */ void mmu_map_region(phys_addr_t start, u64 size, bool emerg); + +/** + * mmu_change_region_attr() - change a mapped region attributes + * + * @start: Start address of the region + * @size: Size of the region + * @aatrs: New attributes + */ void mmu_change_region_attr(phys_addr_t start, size_t size, u64 attrs); +/** + * mmu_change_region_attr_nobreak() - change a mapped region attributes without doing + * break-before-make + * + * @start: Start address of the region + * @size: Size of the region + * @aatrs: New attributes + */ +void mmu_change_region_attr_nobreak(phys_addr_t addr, size_t size, u64 attrs); + /* * smc_call() - issue a secure monitor call * -- cgit v1.2.3