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Commit ec3622d9 authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Russell King
Browse files

[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: default avatarNicolas Pitre <nico@cam.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent e98ff7f6

arch/arm/kernel/head.S

+17 −16
Original line number Diff line number Diff line
@@ -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

	/*