Messages in this thread Patch in this message | | | From | Catalin Marinas <> | Subject | [PATCH v7 15/16] ARM: LPAE: add support for ATAG_MEM64 | Date | Wed, 10 Aug 2011 16:03:38 +0100 |
| |
From: Will Deacon <will.deacon@arm.com>
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 <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> --- arch/arm/include/asm/setup.h | 8 ++++++++ arch/arm/kernel/setup.c | 10 ++++++++++ 2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/setup.h b/arch/arm/include/asm/setup.h index 915696d..a3ca303 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 70bca64..a126558 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,
| |