diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/armv8/cache_v8.c | 26 | ||||
| -rw-r--r-- | arch/arm/include/asm/armv8/mmu.h | 9 |
2 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c index 9b3c37dae82..672ec16d483 100644 --- a/arch/arm/cpu/armv8/cache_v8.c +++ b/arch/arm/cpu/armv8/cache_v8.c @@ -86,6 +86,32 @@ int mem_map_from_dram_banks(unsigned int index, unsigned int len, u64 attrs) return 0; } + +int mmu_unmap_reserved_mem(const char *name, bool check_nomap) +{ + void *fdt = (void *)gd->fdt_blob; + char node_path[128]; + fdt_addr_t addr; + fdt_size_t size; + int ret; + + snprintf(node_path, sizeof(node_path), "/reserved-memory/%s", name); + ret = fdt_path_offset(fdt, node_path); + if (ret < 0) + return ret; + + if (check_nomap && !fdtdec_get_bool(fdt, ret, "no-map")) + return -EINVAL; + + addr = fdtdec_get_addr_size(fdt, ret, "reg", &size); + if (addr == FDT_ADDR_T_NONE) + return -1; + + mmu_change_region_attr_nobreak(addr, size, PTE_TYPE_FAULT); + + return 0; +} + u64 get_tcr(u64 *pips, u64 *pva_bits) { int el = get_effective_el(); 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); /** |