diff options
| author | Anshul Dalal <anshuld@ti.com> | 2025-10-17 18:45:29 +0530 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2025-10-22 12:05:52 -0600 |
| commit | 856480eef0a25dde339cce6d1889efdc836c6be8 (patch) | |
| tree | a0fa72da2d9e2624343b07d5a12ebd00a02e92cf /arch/arm/include/asm | |
| parent | f1c694b8fddece279cdd103ae4009bf25345d8e4 (diff) | |
arm: armv8: mmu: add mmu_unmap_reserved_mem
For armv8, U-Boot uses a static map defined as 'mem_map' for configuring
the MMU's page tables, done by mmu_setup.
Though this works well for simpler platforms, it makes creating runtime
carveouts by modifying the static array at runtime exceedingly complex
like in mach-snapdragon/board.c.
Creation of such carveouts are much better handled by APIs such as
mmu_change_region_attr once the page tables are configured. Usually such
carveouts are configured via the device-tree's reserved-memory node
which provides the address and size for the carveout.
Therefore this patch adds mmu_unmap_reserved_mem which acts as a wrapper
over mmu_change_region_attr, helping unmap a reserved-memory region.
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Anshul Dalal <anshuld@ti.com>
Tested-by: Wadim Egorov <w.egorov@phytec.de>
Diffstat (limited to 'arch/arm/include/asm')
| -rw-r--r-- | arch/arm/include/asm/armv8/mmu.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/include/asm/armv8/mmu.h b/arch/arm/include/asm/armv8/mmu.h index 6e7a3366844..8aa5f9721c4 100644 --- a/arch/arm/include/asm/armv8/mmu.h +++ b/arch/arm/include/asm/armv8/mmu.h @@ -207,6 +207,15 @@ void setup_pgtables(void); */ int mem_map_from_dram_banks(unsigned int index, unsigned int len, u64 attrs); +/** + * mmu_unmap_reserved_mem() - Unmaps a reserved-memory node as PTE_TYPE_FAULT + * once MMU is configured by mmu_setup. + * + * @name: The name of the node under "/reserved-memory/" path + * @check_nomap: Check if the node is marked "no-map" before unmapping it + */ +int mmu_unmap_reserved_mem(const char *name, bool check_nomap); + u64 get_tcr(u64 *pips, u64 *pva_bits); /** |