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[ARM] 4226/1: initial .data and .bss mappings of XIP kernel should be TEXT_OFFSET

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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>
This commit is contained in:
Nicolas Pitre 2007-02-21 15:32:28 +01:00 committed by Russell King
parent e98ff7f6d8
commit ec3622d963
1 changed files with 17 additions and 16 deletions
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33
arch/arm/kernel/head.S
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@ -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
/*