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ARM: introduce atag_offset to replace boot_params

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The boot_params member of the mdesc structure is used to provide a
default physical address for the ATAG list.  Since this value is fixed
at compile time and sometimes based on constants such as ARCH_PHYS_OFFSET,
it gets in the way of runtime PHYS_OFFSET and CONFIG_ARM_PATCH_PHYS_VIRT
usage.

Let's introduce atag_offset which should contains only the relative
offset from PHYS_OFFSET instead of an absolute value, in preparation
to move all instance of boot_params over to it.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Tested-by: Petr Štetiar <ynezz@true.cz>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Nicolas Pitre 2011-07-05 22:38:10 -04:00 committed by Nicolas Pitre
parent 93ee7a9340
commit 2bb9839e31
2 changed files with 3 additions and 0 deletions
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1
arch/arm/include/asm/mach/arch.h
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@ -18,6 +18,7 @@ struct machine_desc {
unsigned int nr; /* architecture number */
const char *name; /* architecture name */
unsigned long boot_params; /* tagged list */
unsigned long atag_offset; /* tagged list (relative) */
const char **dt_compat; /* array of device tree
* 'compatible' strings */

2
arch/arm/kernel/setup.c
View File

@ -819,6 +819,8 @@ static struct machine_desc * __init setup_machine_tags(unsigned int nr)
if (__atags_pointer)
tags = phys_to_virt(__atags_pointer);
else if (mdesc->atag_offset)
tags = (void *)(PAGE_OFFSET + mdesc->atag_offset);
else if (mdesc->boot_params) {
#ifdef CONFIG_MMU
/*