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authorDavid Brown <davidb@codeaurora.org>2009-10-01 17:43:29 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-10-02 22:32:34 +0100
commit31abdb744179159f8b605f56da5b197b188e1689 (patch)
tree3f7831e86901526bd0da7d8da18ab4de348c22ff
parent0a4bc5e89cfc3cc3083acef130cd8b670ee56914 (diff)
ARM: 5739/1: ARM: allow empty ATAG_CORE
From: David Brown <davidb@quicinc.com> The ATAG_CORE is allowed to be empty. Although this is handled by parse_tag_core(), __vet_atags during startup rejects this tag unless it contains data. Allow the initial tag to be either the full size, or empty. Signed-off-by: David Brown <davidb@quicinc.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/kernel/head-common.S4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S
index 93ad576b2d74..885a7214418d 100644
--- a/arch/arm/kernel/head-common.S
+++ b/arch/arm/kernel/head-common.S
@@ -13,6 +13,7 @@
#define ATAG_CORE 0x54410001
#define ATAG_CORE_SIZE ((2*4 + 3*4) >> 2)
+#define ATAG_CORE_SIZE_EMPTY ((2*4) >> 2)
.align 2
.type __switch_data, %object
@@ -251,7 +252,8 @@ __vet_atags:
bne 1f
ldr r5, [r2, #0] @ is first tag ATAG_CORE?
- subs r5, r5, #ATAG_CORE_SIZE
+ cmp r5, #ATAG_CORE_SIZE
+ cmpne r5, #ATAG_CORE_SIZE_EMPTY
bne 1f
ldr r5, [r2, #4]
ldr r6, =ATAG_CORE