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authorDeepa Dinamani <deepad@codeaurora.org>2015-01-28 14:15:56 -0800
committerPatrick Georgi <pgeorgi@google.com>2015-04-22 08:58:48 +0200
commite1977482638f71904cecb5b251ee687107acdce4 (patch)
treeb50514fb5692173c485dfa5a294fefd100da0a22 /src/arch
parented84a8f5406e35a6f5c88ac30ee003e62f264a14 (diff)
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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 <pgeorgi@chromium.org> Original-Commit-Id: 67db80e6476d8ed35f0a9d1e0d3ca03612b9d9be Original-Change-Id: I6b149c7edbd975231b783cc53ddb63cf2e94052c Original-Signed-off-by: Vikas Das <vdas@codeaurora.org> Original-Reviewed-on: https://chromium-review.googlesource.com/253800 Original-Reviewed-by: Julius Werner <jwerner@chromium.org> Original-Tested-by: Deepa Dinamani <deepad@codeaurora.org> Original-Commit-Queue: Deepa Dinamani <deepad@codeaurora.org> Reviewed-on: http://review.coreboot.org/9912 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/arm/armv7/mmu.c23
-rw-r--r--src/arch/arm/include/armv7/arch/cache.h2
2 files changed, 24 insertions, 1 deletions
diff --git a/src/arch/arm/armv7/mmu.c b/src/arch/arm/armv7/mmu.c
index 581c57244..727da5cf7 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 12df5c309..df44c47f2 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 */