Messages in this thread Patch in this message | | | Subject | [RFC PATCH 16/18] ARM: LPAE: add support for ATAG_MEM64 | From | Catalin Marinas <> | Date | Mon, 25 Oct 2010 10:01:04 +0100 |
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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 | 10 +++++++++- arch/arm/kernel/compat.c | 4 ++-- arch/arm/kernel/setup.c | 12 +++++++++++- 3 files changed, 22 insertions(+), 4 deletions(-)
diff --git a/arch/arm/include/asm/setup.h b/arch/arm/include/asm/setup.h index 5092118..fab849f 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 @@ -147,7 +154,8 @@ struct tag { struct tag_header hdr; union { struct tag_core core; - struct tag_mem32 mem; + struct tag_mem32 mem32; + struct tag_mem64 mem64; struct tag_videotext videotext; struct tag_ramdisk ramdisk; struct tag_initrd initrd; diff --git a/arch/arm/kernel/compat.c b/arch/arm/kernel/compat.c index 9256523..f224d95 100644 --- a/arch/arm/kernel/compat.c +++ b/arch/arm/kernel/compat.c @@ -86,8 +86,8 @@ static struct tag * __init memtag(struct tag *tag, unsigned long start, unsigned tag = tag_next(tag); tag->hdr.tag = ATAG_MEM; tag->hdr.size = tag_size(tag_mem32); - tag->u.mem.size = size; - tag->u.mem.start = start; + tag->u.mem32.size = size; + tag->u.mem32.start = start; return tag; } diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index b1f3fe9..a6a37d5 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -556,11 +556,21 @@ __tagtable(ATAG_CORE, parse_tag_core); static int __init parse_tag_mem32(const struct tag *tag) { - return arm_add_memory(tag->u.mem.start, tag->u.mem.size); + return arm_add_memory(tag->u.mem32.start, tag->u.mem32.size); } __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,
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