5 * SPDX-License-Identifier: GPL-2.0+
14 * Physical address of memory base for VxWorks x86
15 * This is LOCAL_MEM_LOCAL_ADRS in the VxWorks kernel configuration.
17 #define VXWORKS_PHYS_MEM_BASE 0x100000
20 * VxWorks x86 E820 related stuff
22 * VxWorks on x86 gets E820 information from pre-defined offset @
23 * 0x4a00 and 0x4000. At 0x4a00 it's an information table defined
24 * by VxWorks and the actual E820 table entries starts from 0x4000.
25 * As defined by the BIOS E820 spec, the maximum number of E820 table
26 * entries is 128 and each entry occupies 20 bytes, so it's 128 * 20
27 * = 2560 (0xa00) bytes in total. That's where VxWorks stores some
28 * information that is retrieved from the BIOS E820 call and saved
29 * later for sanity test during the kernel boot-up.
31 #define E820_DATA_OFFSET 0x4000
32 #define E820_INFO_OFFSET 0x4a00
34 /* E820 info signatiure "SMAP" - System MAP */
35 #define E820_SIGNATURE 0x534d4150
38 u32 sign; /* "SMAP" signature */
39 u32 x0; /* don't care, used by VxWorks */
40 u32 x1; /* don't care, used by VxWorks */
41 u32 x2; /* don't care, used by VxWorks */
42 u32 addr; /* last e820 table entry addr */
43 u32 x3; /* don't care, used by VxWorks */
44 u32 entries; /* e820 table entry count */
45 u32 error; /* must be zero */
49 * VxWorks bootloader stores its size at a pre-defined offset @ 0x5004.
50 * Later when VxWorks kernel boots up and system memory information is
51 * retrieved from the E820 table, the bootloader size will be subtracted
52 * from the total system memory size to calculate the size of available
55 #define BOOT_IMAGE_SIZE_OFFSET 0x5004
58 * When booting from EFI BIOS, VxWorks bootloader stores the EFI GOP
59 * framebuffer info at a pre-defined offset @ 0x6100. When VxWorks kernel
60 * boots up, its EFI console driver tries to find such a block and if
61 * the signature matches, the framebuffer information will be used to
62 * initialize the driver.
64 * However it is not necessary to prepare an EFI environment for VxWorks's
65 * EFI console driver to function (eg: EFI loader in U-Boot). If U-Boot has
66 * already initialized the graphics card and set it to a VESA mode that is
67 * compatible with EFI GOP, we can simply prepare such a block for VxWorks.
69 #define EFI_GOP_INFO_OFFSET 0x6100
71 /* EFI GOP info signatiure */
72 #define EFI_GOP_INFO_MAGIC 0xfeedface
75 u32 magic; /* signature */
76 struct efi_gop_mode_info info; /* EFI GOP mode info structure */
77 phys_addr_t fb_base; /* framebuffer base address */
78 u32 fb_size; /* framebuffer size */
81 int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
82 void boot_prep_vxworks(bootm_headers_t *images);
83 void boot_jump_vxworks(bootm_headers_t *images);
84 void do_bootvx_fdt(bootm_headers_t *images);