include/vxworks.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * (C) Copyright 2008
   4  * Niklaus Giger, niklaus.giger@member.fsf.org
   5  */
   6
   7 #ifndef _VXWORKS_H_
   8 #define _VXWORKS_H_
   9
  10 #include <efi_api.h>
  11
  12 /*
  13  * Physical address of memory base for VxWorks x86
  14  * This is LOCAL_MEM_LOCAL_ADRS in the VxWorks kernel configuration.
  15  */
  16 #define VXWORKS_PHYS_MEM_BASE   0x100000
  17
  18 /* x86 bootline offset relative to LOCAL_MEM_LOCAL_ADRS in VxWorks */
  19 #define X86_BOOT_LINE_OFFSET    0x1200
  20
  21 /*
  22  * VxWorks x86 E820 related stuff
  23  *
  24  * VxWorks on x86 gets E820 information from pre-defined offset @
  25  * 0x4a00 and 0x4000. At 0x4a00 it's an information table defined
  26  * by VxWorks and the actual E820 table entries starts from 0x4000.
  27  * As defined by the BIOS E820 spec, the maximum number of E820 table
  28  * entries is 128 and each entry occupies 20 bytes, so it's 128 * 20
  29  * = 2560 (0xa00) bytes in total. That's where VxWorks stores some
  30  * information that is retrieved from the BIOS E820 call and saved
  31  * later for sanity test during the kernel boot-up.
  32  */
  33 #define E820_DATA_OFFSET        0x4000
  34 #define E820_INFO_OFFSET        0x4a00
  35
  36 /* E820 info signatiure "SMAP" - System MAP */
  37 #define E820_SIGNATURE  0x534d4150
  38
  39 struct e820_info {
  40         u32 sign;       /* "SMAP" signature */
  41         u32 x0;         /* don't care, used by VxWorks */
  42         u32 x1;         /* don't care, used by VxWorks */
  43         u32 x2;         /* don't care, used by VxWorks */
  44         u32 addr;       /* last e820 table entry addr */
  45         u32 x3;         /* don't care, used by VxWorks */
  46         u32 entries;    /* e820 table entry count */
  47         u32 error;      /* must be zero */
  48 };
  49
  50 /*
  51  * VxWorks bootloader stores its size at a pre-defined offset @ 0x5004.
  52  * Later when VxWorks kernel boots up and system memory information is
  53  * retrieved from the E820 table, the bootloader size will be subtracted
  54  * from the total system memory size to calculate the size of available
  55  * memory for the OS.
  56  */
  57 #define BOOT_IMAGE_SIZE_OFFSET  0x5004
  58
  59 /*
  60  * When booting from EFI BIOS, VxWorks bootloader stores the EFI GOP
  61  * framebuffer info at a pre-defined offset @ 0x6100. When VxWorks kernel
  62  * boots up, its EFI console driver tries to find such a block and if
  63  * the signature matches, the framebuffer information will be used to
  64  * initialize the driver.
  65  *
  66  * However it is not necessary to prepare an EFI environment for VxWorks's
  67  * EFI console driver to function (eg: EFI loader in U-Boot). If U-Boot has
  68  * already initialized the graphics card and set it to a VESA mode that is
  69  * compatible with EFI GOP, we can simply prepare such a block for VxWorks.
  70  */
  71 #define EFI_GOP_INFO_OFFSET     0x6100
  72
  73 /* EFI GOP info signatiure */
  74 #define EFI_GOP_INFO_MAGIC      0xfeedface
  75
  76 struct efi_gop_info {
  77         u32 magic;                      /* signature */
  78         struct efi_gop_mode_info info;  /* EFI GOP mode info structure */
  79         phys_addr_t fb_base;            /* framebuffer base address */
  80         u32 fb_size;                    /* framebuffer size */
  81 };
  82
  83 int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
  84 void boot_prep_vxworks(bootm_headers_t *images);
  85 void boot_jump_vxworks(bootm_headers_t *images);
  86
  87 #endif