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[ARM] 4224/2: allow XIP kernel to boot again 

Since commit 2552fc27ff XIP kernels failed
to boot because (_end - PAGE_OFFSET - 1) is much smaller than the size
of the kernel text and data in the XIP case, causing the kernel not to
be entirely mapped.

Even in the non-XIP case, the use of (_end - PAGE_OFFSET - 1) is wrong
because it produces a too large value if TEXT_OFFSET is larger than 1MB.

Finally the original code was performing one loop too many.

Let's break the loop when the section pointer has passed the last byte
of the kernel instead.

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 2007-02-22 16:18:09 +01:00 committed by Russell King
parent 0ebffe39f8
commit e98ff7f6d8
2 changed files with 14 additions and 12 deletions
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25
arch/arm/kernel/head.S
View File

@ -48,9 +48,11 @@
.endm
#ifdef CONFIG_XIP_KERNEL
#define TEXTADDR XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
#define KERNEL_START XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
#define KERNEL_END _edata_loc
#else
#define TEXTADDR KERNEL_RAM_VADDR
#define KERNEL_START KERNEL_RAM_VADDR
#define KERNEL_END _end
#endif
/*
@ -240,16 +242,15 @@ __create_page_tables:
* Now setup the pagetables for our kernel direct
* mapped region.
*/
add r0, r4, #(TEXTADDR & 0xff000000) >> 18 @ start of kernel
str r3, [r0, #(TEXTADDR & 0x00f00000) >> 18]!
ldr r6, =(_end - PAGE_OFFSET - 1) @ r6 = number of sections
mov r6, r6, lsr #20 @ needed for kernel minus 1
1: add r3, r3, #1 << 20
str r3, [r0, #4]!
subs r6, r6, #1
bgt 1b
add r0, r4, #(KERNEL_START & 0xff000000) >> 18
str r3, [r0, #(KERNEL_START & 0x00f00000) >> 18]!
ldr r6, =(KERNEL_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
/*
* Then map first 1MB of ram in case it contains our boot params.

1
arch/arm/kernel/vmlinux.lds.S
View File

@ -156,6 +156,7 @@ SECTIONS
_edata = .;
}
_edata_loc = __data_loc + SIZEOF(.data);
.bss : {
__bss_start = .; /* BSS */