From mboxrd@z Thu Jan 1 00:00:00 1970 From: ben.dooks@codethink.co.uk (Ben Dooks) Date: Wed, 19 Jun 2013 17:30:00 +0100 Subject: [PATCH 3/6] ARM: add atag32_to_cpu() function In-Reply-To: <1371659404-20167-1-git-send-email-ben.dooks@codethink.co.uk> References: <1371659404-20167-1-git-send-email-ben.dooks@codethink.co.uk> Message-ID: <1371659404-20167-4-git-send-email-ben.dooks@codethink.co.uk> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Add atag32_to_cpu() function to allow code manipulating ATAGs to deal with the case where the boot-loader was in little-endian and Linux is running big-endian. Signed-off-by: Ben Dooks --- arch/arm/include/uapi/asm/setup.h | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/uapi/asm/setup.h b/arch/arm/include/uapi/asm/setup.h index 979ff40..d3b3fa1 100644 --- a/arch/arm/include/uapi/asm/setup.h +++ b/arch/arm/include/uapi/asm/setup.h @@ -175,13 +175,20 @@ struct tagtable { #define tag_member_present(tag,member) \ ((unsigned long)(&((struct tag *)0L)->member + 1) \ - <= (tag)->hdr.size * 4) + <= atag32_to_cpu((tag)->hdr.size) * 4) -#define tag_next(t) ((struct tag *)((__u32 *)(t) + (t)->hdr.size)) +#define tag_next(t) ((struct tag *)((__u32 *)(t) + atag32_to_cpu((t)->hdr.size))) #define tag_size(type) ((sizeof(struct tag_header) + sizeof(struct type)) >> 2) #define for_each_tag(t,base) \ for (t = base; t->hdr.size; t = tag_next(t)) +#ifdef CONFIG_CPU_BE8_BOOT_LE +#define atag32_to_cpu(x) le32_to_cpu(x) +#define cpu_to_atag32(x) cpu_to_le32(x) +#else +#define cpu_to_atag32(x) x +#define atag32_to_cpu(x) x +#endif #endif /* _UAPI__ASMARM_SETUP_H */ -- 1.7.10.4