1351700cf2
VxWorks bootloader stores its size at a pre-defined offset @ 0x5004. Later when VxWorks kernel boots up and system memory information is retrieved from the E820 table, the bootloader size will be subtracted from the total system memory size to calculate the size of available memory for the OS. Explicitly clear the bootloader image size otherwise if memory at this offset happens to contain some garbage data, the final available memory size for the kernel is insane. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/*
|
|
* (C) Copyright 2008
|
|
* Niklaus Giger, niklaus.giger@member.fsf.org
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#ifndef _VXWORKS_H_
|
|
#define _VXWORKS_H_
|
|
|
|
/*
|
|
* Physical address of memory base for VxWorks x86
|
|
* This is LOCAL_MEM_LOCAL_ADRS in the VxWorks kernel configuration.
|
|
*/
|
|
#define VXWORKS_PHYS_MEM_BASE 0x100000
|
|
|
|
/*
|
|
* VxWorks x86 E820 related stuff
|
|
*
|
|
* VxWorks on x86 gets E820 information from pre-defined offset @
|
|
* 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 E820_DATA_OFFSET 0x4000
|
|
#define E820_INFO_OFFSET 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 */
|
|
};
|
|
|
|
/*
|
|
* VxWorks bootloader stores its size at a pre-defined offset @ 0x5004.
|
|
* Later when VxWorks kernel boots up and system memory information is
|
|
* retrieved from the E820 table, the bootloader size will be subtracted
|
|
* from the total system memory size to calculate the size of available
|
|
* memory for the OS.
|
|
*/
|
|
#define BOOT_IMAGE_SIZE_OFFSET 0x5004
|
|
|
|
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);
|
|
void do_bootvx_fdt(bootm_headers_t *images);
|
|
|
|
#endif
|