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authorBin Meng <bmeng.cn@gmail.com>2015-10-07 20:19:18 -0700
committerSimon Glass <sjg@chromium.org>2015-10-21 07:46:26 -0600
commitb90ff0fdaadc4de096afed605b36aac1185fc1dc (patch)
tree1704fb5b174bf760f990aecd0360b5a27bc4a9a4 /include
parent9e98b7e3c5010e918d0fdfae75ab7d6995c1fa75 (diff)
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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 <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com> Tested-by: Jian Luo <jian.luo4@boschrexroth.de>
Diffstat (limited to 'include')
-rw-r--r--include/vxworks.h29
1 files changed, 29 insertions, 0 deletions
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);