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authorRussell King <rmk+kernel@arm.linux.org.uk>2014-01-11 11:22:18 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-01-21 16:42:12 +0000
commit571b14375019c3a66ef70d4d4a7083f4238aca30 (patch)
treea5e0f283bca3a46eadc5061030c30a607d9b5377 /arch
parent1096813131dcfd7d86f156c14b43eb0fdbc090b6 (diff)
ARM: ignore memory below PHYS_OFFSET
If the kernel is loaded higher in physical memory than normal, and we calculate PHYS_OFFSET higher than the start of RAM, this leads to boot problems as we attempt to map part of this RAM into userspace. Rather than struggle with this, just truncate the mapping. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kernel/setup.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 7a2dd4689a7..061cea820e3 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -660,6 +660,20 @@ int __init arm_add_memory(u64 start, u64 size)
}
#endif
+ if (aligned_start < PHYS_OFFSET) {
+ if (aligned_start + size <= PHYS_OFFSET) {
+ pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n",
+ aligned_start, aligned_start + size);
+ return -EINVAL;
+ }
+
+ pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n",
+ aligned_start, (u64)PHYS_OFFSET);
+
+ size -= PHYS_OFFSET - aligned_start;
+ aligned_start = PHYS_OFFSET;
+ }
+
bank->start = aligned_start;
bank->size = size & ~(phys_addr_t)(PAGE_SIZE - 1);