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authorLennert Buytenhek <buytenh@org.rmk.(none)>2006-09-29 21:14:05 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-09-30 11:30:44 +0100
commit2552fc27ff79b10b9678d92bcaef21df38bb7bb6 (patch)
treec69faf46c3df7f9260f33ea7e562bebee6854766 /arch/arm/boot
parent6ae5a6ef0340908fb7065a75231ae9980a910fbe (diff)
[ARM] 3809/3: get rid of 4 megabyte kernel image size limit
We currently have a hardcoded 4 megabyte uncompressed kernel image size limit, which is easily exceeded by, for example, enabling some of the various kernel debugging options. When setting up the initial page tables (which is where this 4M limit is hardcoded), it's actually relatively easy to find out the true size of the uncompressed kernel image and create enough page table entries for things to fit, so this patch makes it so. In the decompressor, we also need to know the size of the uncompressed kernel image, to figure out whether there is any chance that uncompressing the kernel might overwrite the compressed kernel image stored elsewhere in memory. We don't have that info at this boot stage, though, so we approximate the size of the uncompressed kernel by taking the compressed kernel image size and allowing for a maximum 4x expansion. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/boot')
-rw-r--r--arch/arm/boot/compressed/head.S3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index e5ab51b9cce..2568d311be2 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -237,7 +237,8 @@ not_relocated: mov r0, #0
*/
cmp r4, r2
bhs wont_overwrite
- add r0, r4, #4096*1024 @ 4MB largest kernel size
+ sub r3, sp, r5 @ > compressed kernel size
+ add r0, r4, r3, lsl #2 @ allow for 4x expansion
cmp r0, r5
bls wont_overwrite