From mboxrd@z Thu Jan 1 00:00:00 1970 From: nicolas.pitre@linaro.org (Nicolas Pitre) Date: Tue, 05 Jul 2011 22:46:46 -0400 Subject: [PATCH 01/52] ARM: introduce atag_offset to replace boot_params Message-ID: <1309920457-21913-1-git-send-email-nicolas.pitre@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 often based on ARCH_PHYS_OFFSET, it gets in the way of runtime PHYS_OFFSET usage. Let's introduce atag_offset which should contains only the relative offset from start of memory instead of an absolute value, in preparation to move all instance of boot_params over to it. Signed-off-by: Nicolas Pitre --- arch/arm/include/asm/mach/arch.h | 1 + arch/arm/kernel/setup.c | 2 ++ 2 files changed, 3 insertions(+), 0 deletions(-) diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h index 7b79a00..1bdf6e1 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 e0db84d..4cc3e2b 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -816,6 +816,8 @@ 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 = PAGE_OFFSET + mdesc->atag_offset; else if (mdesc->boot_params) { #ifdef CONFIG_MMU /* -- 1.7.4