From e1977482638f71904cecb5b251ee687107acdce4 Mon Sep 17 00:00:00 2001 From: Deepa Dinamani Date: Wed, 28 Jan 2015 14:15:56 -0800 Subject: arch/armv7: Add API to disable MMU pages. Disables 4K regions in the MMU table. Assumes that the region is already accounted for by the first level page table entry. BRANCH=storm BUG=chrome-os-partner:24786 TEST=verified mmu.pagetable.list output for Storm: _______address___________|_physical________________|sec|_d_|_size____|_permissions____________________|_glb|_shr|_pageflags______________________| C:00000000--00000FFF| | | | | | | | | C:00001000--000FFFFF| A:00:00001000--000FFFFF| ns| 00| 00001000| P:readwrite U:readwrite notexec| yes| no | strongly ordered | C:00100000--29FFFFFF| A:00:00100000--29FFFFFF| ns| 00| 00100000| P:readwrite U:readwrite notexec| yes| no | strongly ordered | C:2A000000--2A05FFFF| A:00:2A000000--2A05FFFF| ns| 00| 00001000| P:readwrite U:readwrite exec | yes| no | write-back/no write alloc | C:2A060000--2A0FFFFF| A:00:2A060000--2A0FFFFF| ns| 00| 00001000| P:readwrite U:readwrite notexec| yes| no | strongly ordered | C:2A100000--3FFFFFFF| A:00:2A100000--3FFFFFFF| ns| 00| 00100000| P:readwrite U:readwrite notexec| yes| no | strongly ordered | C:40000000--59FFFFFF| A:00:40000000--59FFFFFF| ns| 00| 00100000| P:readwrite U:readwrite exec | yes| no | write-back/no write alloc | C:5A000000--5A1FFFFF| A:00:5A000000--5A1FFFFF| ns| 00| 00100000| P:readwrite U:readwrite notexec| yes| no | strongly ordered | C:5A200000--7FFFFFFF| A:00:5A200000--7FFFFFFF| ns| 00| 00100000| P:readwrite U:readwrite exec | yes| no | write-back/no write alloc | C:80000000--FFFFFFFF| | | | | | | | | Change-Id: Ib603da91966cc4c70ea9d5fee04f1e9890d0bb93 Signed-off-by: Patrick Georgi Original-Commit-Id: 67db80e6476d8ed35f0a9d1e0d3ca03612b9d9be Original-Change-Id: I6b149c7edbd975231b783cc53ddb63cf2e94052c Original-Signed-off-by: Vikas Das Original-Reviewed-on: https://chromium-review.googlesource.com/253800 Original-Reviewed-by: Julius Werner Original-Tested-by: Deepa Dinamani Original-Commit-Queue: Deepa Dinamani Reviewed-on: http://review.coreboot.org/9912 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/arch/arm/armv7/mmu.c | 23 ++++++++++++++++++++++- src/arch/arm/include/armv7/arch/cache.h | 2 ++ 2 files changed, 24 insertions(+), 1 deletion(-) 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", diff --git a/src/arch/arm/include/armv7/arch/cache.h b/src/arch/arm/include/armv7/arch/cache.h index 12df5c309f..df44c47f21 100644 --- a/src/arch/arm/include/armv7/arch/cache.h +++ b/src/arch/arm/include/armv7/arch/cache.h @@ -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 @@ -402,5 +403,6 @@ void mmu_config_range(u32 start_mb, u32 size_mb, enum dcache_policy policy); * Careful: Do NOT map over this address range with mmu_config_range() again * later, or you will leak resources and may desync your TLB! */ void mmu_config_range_kb(u32 start_kb, u32 size_kb, enum dcache_policy policy); +void mmu_disable_range_kb(u32 start_kb, u32 size_kb); #endif /* ARM_CACHE_H */ -- cgit v1.2.3