From 2bb9839e312ed55a6d5824ffa6077ce3d7d63b1e Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Tue, 5 Jul 2011 22:38:10 -0400 Subject: ARM: introduce atag_offset to replace boot_params MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Tested-by: H Hartley Sweeten Tested-by: Petr Štetiar Acked-by: Arnd Bergmann --- arch/arm/include/asm/mach/arch.h | 1 + arch/arm/kernel/setup.c | 2 ++ 2 files changed, 3 insertions(+) diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h index 217aa1911dd..cc240c03efe 100644 --- a/arch/arm/include/asm/mach/arch.h +++ b/arch/arm/include/asm/mach/arch.h @@ -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 */ diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 70bca649e92..2737ba3f739 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -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 /* -- cgit v1.2.3-70-g09d2