From 2ea9b9485913863acd41151ad65ac9d1d22787a2 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Mon, 31 Jan 2011 13:50:46 +0000 Subject: [PATCH] ARM: LPAE: add support for ATAG_MEM64 LPAE provides support for memory banks with physical addresses of up to 40 bits. This patch adds a new atag, ATAG_MEM64, so that the Kernel can be informed about memory that exists above the 4GB boundary. Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas --- arch/arm/include/asm/setup.h | 8 ++++++++ arch/arm/kernel/setup.c | 10 ++++++++++ 2 files changed, 18 insertions(+) diff --git a/arch/arm/include/asm/setup.h b/arch/arm/include/asm/setup.h index 915696dd9c7c..a3ca303a0801 100644 --- a/arch/arm/include/asm/setup.h +++ b/arch/arm/include/asm/setup.h @@ -43,6 +43,13 @@ struct tag_mem32 { __u32 start; /* physical start address */ }; +#define ATAG_MEM64 0x54420002 + +struct tag_mem64 { + __u64 size; + __u64 start; /* physical start address */ +}; + /* VGA text type displays */ #define ATAG_VIDEOTEXT 0x54410003 @@ -148,6 +155,7 @@ struct tag { union { struct tag_core core; struct tag_mem32 mem; + struct tag_mem64 mem64; struct tag_videotext videotext; struct tag_ramdisk ramdisk; struct tag_initrd initrd; diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 70bca649e925..a1265581a374 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -608,6 +608,16 @@ static int __init parse_tag_mem32(const struct tag *tag) __tagtable(ATAG_MEM, parse_tag_mem32); +#ifdef CONFIG_PHYS_ADDR_T_64BIT +static int __init parse_tag_mem64(const struct tag *tag) +{ + /* We only use 32-bits for the size. */ + return arm_add_memory(tag->u.mem64.start, (unsigned long)tag->u.mem64.size); +} + +__tagtable(ATAG_MEM64, parse_tag_mem64); +#endif /* CONFIG_PHYS_ADDR_T_64BIT */ + #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) struct screen_info screen_info = { .orig_video_lines = 30, -- 2.39.5