diff options
Diffstat (limited to 'src/arch/arm/armv7/mmu.c')
| -rw-r--r-- | src/arch/arm/armv7/mmu.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/src/arch/arm/armv7/mmu.c b/src/arch/arm/armv7/mmu.c index 581c57244e..727da5cf72 100644 --- a/src/arch/arm/armv7/mmu.c +++ b/src/arch/arm/armv7/mmu.c @@ -1,6 +1,7 @@ /* * This file is part of the coreboot project. * + * Copyright (c) 2015, The Linux Foundation. All rights reserved. * Copyright 2013 Google Inc. * * Redistribution and use in source and binary forms, with or without @@ -185,7 +186,7 @@ static pte_t *mmu_create_subtable(pte_t *pgd_entry) return table; } -void mmu_config_range_kb(u32 start_kb, u32 size_kb, enum dcache_policy policy) +static pte_t *mmu_validate_create_sub_table(u32 start_kb, u32 size_kb) { pte_t *pgd_entry = &ttb_buff[start_kb / (BLOCK_SIZE/KiB)]; pte_t *table = (void *)(uintptr_t)(*pgd_entry & NEXTLEVEL_MASK); @@ -197,6 +198,13 @@ void mmu_config_range_kb(u32 start_kb, u32 size_kb, enum dcache_policy policy) if ((*pgd_entry & ~NEXTLEVEL_MASK) != ATTR_NEXTLEVEL) table = mmu_create_subtable(pgd_entry); + return table; +} + +void mmu_config_range_kb(u32 start_kb, u32 size_kb, enum dcache_policy policy) +{ + pte_t *table = mmu_validate_create_sub_table(start_kb, size_kb); + /* Always _one_ _damn_ bit that won't fit... (XN moves from 4 to 0) */ pte_t attr = attrs[policy].value; if (!IS_ENABLED(CONFIG_ARM_LPAE) && (attr & (1 << 4))) @@ -211,6 +219,19 @@ void mmu_config_range_kb(u32 start_kb, u32 size_kb, enum dcache_policy policy) (start_kb & ~mask) * KiB, PAGE_SHIFT, ATTR_PAGE | attr); } +void mmu_disable_range_kb(u32 start_kb, u32 size_kb) +{ + pte_t *table = mmu_validate_create_sub_table(start_kb, size_kb); + + /* Mask away high address bits that are handled by upper level table. */ + u32 mask = BLOCK_SIZE/KiB - 1; + printk(BIOS_DEBUG, "Setting address range [%#.8x:%#.8x) as unmapped\n", + start_kb * KiB, (start_kb + size_kb) * KiB); + mmu_fill_table(table, (start_kb & mask) / (PAGE_SIZE/KiB), + div_round_up((start_kb + size_kb) & mask, PAGE_SIZE/KiB), + (start_kb & ~mask) * KiB, PAGE_SHIFT, 0); +} + void mmu_disable_range(u32 start_mb, u32 size_mb) { printk(BIOS_DEBUG, "Setting address range [%#.8x:%#.8x) as unmapped\n", |