diff options
| author | Anshul Dalal <[email protected]> | 2025-10-17 18:45:25 +0530 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2025-10-22 12:05:52 -0600 |
| commit | 567a683e8ced54c3ffa53f62a4ed7e535268c6f2 (patch) | |
| tree | 9ea4a7e0433c6bf406fb3db321edb6ba7dc56d20 | |
| parent | e55e57d240e0bdef604efca5b386978b1c70d513 (diff) | |
arm: armv8: mmu: export mmu_setup
The mmu_setup function configures the page tables based on the board
supplied mem_map struct array. It is called implicitly as part of
dcache_enable but this limits us to only be able to use APIs such as
mmu_change_region_attr only after caches are enabled.
This might lead to speculative accesses before we can unmap a region
that is marked as cacheable in the static memory map.
Therefore this patch exports the mmu_setup function in mmu.h allowing
users to have more control over when the mmu is configured.
For K3 specifically this allows for the following configuration sequence
as part of enable_caches:
static mem_map fixups (TODO) -> mmu_setup -> carveouts using
mmu_change_region_attr (TODO) -> icache/dcache enable
Reviewed-by: Dhruva Gole <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
Signed-off-by: Anshul Dalal <[email protected]>
Tested-by: Wadim Egorov <[email protected]>
| -rw-r--r-- | arch/arm/include/asm/armv8/mmu.h | 5 | ||||
| -rw-r--r-- | arch/arm/mach-k3/common.c | 3 |
2 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/include/asm/armv8/mmu.h b/arch/arm/include/asm/armv8/mmu.h index 6af8cd111a4..3807c702fb6 100644 --- a/arch/arm/include/asm/armv8/mmu.h +++ b/arch/arm/include/asm/armv8/mmu.h @@ -197,6 +197,11 @@ struct mm_region { extern struct mm_region *mem_map; void setup_pgtables(void); u64 get_tcr(u64 *pips, u64 *pva_bits); + +/** + * mmu_setup() - Sets up the mmu page tables as per mem_map + */ +void mmu_setup(void); #endif #endif /* _ASM_ARMV8_MMU_H_ */ diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c index 7f2a4e6260e..ea287ba1226 100644 --- a/arch/arm/mach-k3/common.c +++ b/arch/arm/mach-k3/common.c @@ -30,6 +30,7 @@ #include <soc.h> #include <dm/uclass-internal.h> #include <dm/device-internal.h> +#include <asm/armv8/mmu.h> #define PROC_BOOT_CTRL_FLAG_R5_CORE_HALT 0x00000001 #define PROC_BOOT_STATUS_FLAG_R5_WFI 0x00000002 @@ -261,6 +262,8 @@ void board_prep_linux(struct bootm_headers *images) void enable_caches(void) { + mmu_setup(); + icache_enable(); dcache_enable(); } |