Commit 2bb9839e authored Jul 05, 2011 by Nicolas Pitre Committed by Nicolas Pitre Aug 21, 2011

ARM: introduce atag_offset to replace boot_params



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>

parent 93ee7a93

arch/arm/include/asm/mach/arch.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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 */

arch/arm/kernel/setup.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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
		/*