From b90ff0fdaadc4de096afed605b36aac1185fc1dc Mon Sep 17 00:00:00 2001 From: Bin Meng Date: Wed, 7 Oct 2015 20:19:18 -0700 Subject: cmd: bootvx: Pass E820 information to an x86 VxWorks kernel E820 is critical to the kernel as it provides system memory map information. Pass it to an x86 VxWorks kernel. Signed-off-by: Bin Meng Acked-by: Simon Glass Reviewed-by: Tom Rini Tested-by: Jian Luo --- include/vxworks.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'include') diff --git a/include/vxworks.h b/include/vxworks.h index 297a70f..f69b008 100644 --- a/include/vxworks.h +++ b/include/vxworks.h @@ -8,6 +8,35 @@ #ifndef _VXWORKS_H_ #define _VXWORKS_H_ +/* + * VxWorks x86 E820 related stuff + * + * VxWorks on x86 gets E820 information from pre-defined address @ + * 0x4a00 and 0x4000. At 0x4a00 it's an information table defined + * by VxWorks and the actual E820 table entries starts from 0x4000. + * As defined by the BIOS E820 spec, the maximum number of E820 table + * entries is 128 and each entry occupies 20 bytes, so it's 128 * 20 + * = 2560 (0xa00) bytes in total. That's where VxWorks stores some + * information that is retrieved from the BIOS E820 call and saved + * later for sanity test during the kernel boot-up. + */ +#define VXWORKS_E820_DATA_ADDR 0x4000 +#define VXWORKS_E820_INFO_ADDR 0x4a00 + +/* E820 info signatiure "SMAP" - System MAP */ +#define E820_SIGNATURE 0x534d4150 + +struct e820info { + u32 sign; /* "SMAP" signature */ + u32 x0; /* don't care, used by VxWorks */ + u32 x1; /* don't care, used by VxWorks */ + u32 x2; /* don't care, used by VxWorks */ + u32 addr; /* last e820 table entry addr */ + u32 x3; /* don't care, used by VxWorks */ + u32 entries; /* e820 table entry count */ + u32 error; /* must be zero */ +}; + int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]); void boot_prep_vxworks(bootm_headers_t *images); void boot_jump_vxworks(bootm_headers_t *images); -- cgit v1.1