From 0063fdede69b2cc6f861aab0641f7e25f451def9 Mon Sep 17 00:00:00 2001 From: Marcin Nowakowski Date: Wed, 23 Nov 2016 14:43:47 +0100 Subject: [PATCH] MIPS: platform: Allow for DTB to be moved during kernel relocation Add plat_fdt_relocated(void*) API to allow the kernel relocation code to update platform's information about the DTB location if the DTB had to be moved due to being placed in a location used by the relocated kernel. Signed-off-by: Marcin Nowakowski Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14611/ Signed-off-by: Ralf Baechle --- arch/mips/generic/init.c | 13 +++++++++++++ arch/mips/include/asm/bootinfo.h | 13 +++++++++++++ 2 files changed, 26 insertions(+) diff --git a/arch/mips/generic/init.c b/arch/mips/generic/init.c index d493ccbf274a..4af619215410 100644 --- a/arch/mips/generic/init.c +++ b/arch/mips/generic/init.c @@ -88,6 +88,19 @@ void __init *plat_get_fdt(void) return (void *)fdt; } +void __init plat_fdt_relocated(void *new_location) +{ + /* + * reset fdt as the cached value would point to the location + * before relocations happened and update the location argument + * if it was passed using UHI + */ + fdt = NULL; + + if (fw_arg0 == -2) + fw_arg1 = (unsigned long)new_location; +} + void __init plat_mem_setup(void) { if (mach && mach->fixup_fdt) diff --git a/arch/mips/include/asm/bootinfo.h b/arch/mips/include/asm/bootinfo.h index ee9f5f2d18fc..e26a093bb17a 100644 --- a/arch/mips/include/asm/bootinfo.h +++ b/arch/mips/include/asm/bootinfo.h @@ -164,6 +164,19 @@ static inline void plat_swiotlb_setup(void) {} * Return: Pointer to the flattened device tree blob. */ extern void *plat_get_fdt(void); + +#ifdef CONFIG_RELOCATABLE + +/** + * plat_fdt_relocated() - Update platform's information about relocated dtb + * + * This function provides a platform-independent API to set platform's + * information about relocated DTB if it needs to be moved due to kernel + * relocation occurring at boot. + */ +void plat_fdt_relocated(void *new_location); + +#endif /* CONFIG_RELOCATABLE */ #endif /* CONFIG_USE_OF */ #endif /* _ASM_BOOTINFO_H */ -- 2.20.1