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 88