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authorNicolas Pitre <nico@cam.org>2007-02-21 15:32:28 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-02-25 16:41:39 +0000
commitec3622d963522432a873cc1b6f66fed6fceddc18 (patch)
tree190048563eab2d45ea4e6540192d2384626ba939 /arch/arm/kernel/head.S
parente98ff7f6d8164c5636538998fb7d1e08b1fbbddd (diff)
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[ARM] 4226/1: initial .data and .bss mappings of XIP kernel should be TEXT_OFFSET
aware Since TEXT_OFFSET is meant to determine RAM location for kernel use, itshould affect .data and .bss initial mapping in the XIP case. Otherwise a XIP kernel would crash if TEXT_OFFSET gets somewhat larger than 2MB. Corresponding code is also moved up a bit to be near the similar .text mapping code making the whole a bit more straight forward to understand. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/head.S')
-rw-r--r--arch/arm/kernel/head.S33
1 files changed, 17 insertions, 16 deletions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index c5f0c52660b2..66db0a9bf0bc 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -252,6 +252,23 @@ __create_page_tables:
strls r3, [r0], #4
bls 1b
+#ifdef CONFIG_XIP_KERNEL
+ /*
+ * Map some ram to cover our .data and .bss areas.
+ */
+ orr r3, r7, #(KERNEL_RAM_PADDR & 0xff000000)
+ orr r3, r3, #(KERNEL_RAM_PADDR & 0x00f00000)
+ add r0, r4, #(KERNEL_RAM_VADDR & 0xff000000) >> 18
+ str r3, [r0, #(KERNEL_RAM_VADDR & 0x00f00000) >> 18]!
+ ldr r6, =(_end - 1)
+ add r0, r0, #4
+ add r6, r4, r6, lsr #18
+1: cmp r0, r6
+ add r3, r3, #1 << 20
+ strls r3, [r0], #4
+ bls 1b
+#endif
+
/*
* Then map first 1MB of ram in case it contains our boot params.
*/
@@ -260,22 +277,6 @@ __create_page_tables:
orr r6, r6, #(PHYS_OFFSET & 0x00e00000)
str r6, [r0]
-#ifdef CONFIG_XIP_KERNEL
- /*
- * Map some ram to cover our .data and .bss areas.
- * Mapping 3MB should be plenty.
- */
- sub r3, r4, #PHYS_OFFSET
- mov r3, r3, lsr #20
- add r0, r0, r3, lsl #2
- add r6, r6, r3, lsl #20
- str r6, [r0], #4
- add r6, r6, #(1 << 20)
- str r6, [r0], #4
- add r6, r6, #(1 << 20)
- str r6, [r0]
-#endif
-
#ifdef CONFIG_DEBUG_LL
ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags
/*
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