From fe2647f2a0d4e4df5d47fdf068aeb2a1edd3d533 Mon Sep 17 00:00:00 2001 From: Anshul Dalal Date: Fri, 17 Oct 2025 18:45:27 +0530 Subject: arm: armv8: mmu: add mem_map_from_dram_banks For armv8, U-Boot uses a static map defined as 'mem_map' for configuring the MMU as part of mmu_setup. But since the exact configuration of memory banks might not be known at build time, many platforms such as imx9, versal2 etc. utilize gd->bd->bi_dram to configure the static map at runtime. Therefore this patch adds a new API mem_map_from_dram_banks that modifies the static map in a similar way. Allowing the caller to map all dram banks by just passing the index to last entry in their mem_map and it's length. Reviewed-by: Dhruva Gole Signed-off-by: Anshul Dalal Tested-by: Wadim Egorov --- arch/arm/include/asm/armv8/mmu.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'arch/arm/include') diff --git a/arch/arm/include/asm/armv8/mmu.h b/arch/arm/include/asm/armv8/mmu.h index 3807c702fb6..6e7a3366844 100644 --- a/arch/arm/include/asm/armv8/mmu.h +++ b/arch/arm/include/asm/armv8/mmu.h @@ -194,8 +194,19 @@ struct mm_region { u64 attrs; }; +/* Used as the memory map for MMU configuration by mmu_setup */ extern struct mm_region *mem_map; void setup_pgtables(void); + +/** + * mem_map_from_dram_banks() - Populate mem_map with entries corresponding to + * dram banks as per the gd. This should be called prior to mmu_setup. + * + * @index: The entry in mem_map to start the over-write + * @len: The size of mem_map + */ +int mem_map_from_dram_banks(unsigned int index, unsigned int len, u64 attrs); + u64 get_tcr(u64 *pips, u64 *pva_bits); /** -- cgit v1.2.3