1 /* 2 * (C) Copyright 2008 3 * Niklaus Giger, niklaus.giger@member.fsf.org 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #ifndef _VXWORKS_H_ 9 #define _VXWORKS_H_ 10 11 /* 12 * VxWorks x86 E820 related stuff 13 * 14 * VxWorks on x86 gets E820 information from pre-defined address @ 15 * 0x4a00 and 0x4000. At 0x4a00 it's an information table defined 16 * by VxWorks and the actual E820 table entries starts from 0x4000. 17 * As defined by the BIOS E820 spec, the maximum number of E820 table 18 * entries is 128 and each entry occupies 20 bytes, so it's 128 * 20 19 * = 2560 (0xa00) bytes in total. That's where VxWorks stores some 20 * information that is retrieved from the BIOS E820 call and saved 21 * later for sanity test during the kernel boot-up. 22 */ 23 #define VXWORKS_E820_DATA_ADDR 0x4000 24 #define VXWORKS_E820_INFO_ADDR 0x4a00 25 26 /* E820 info signatiure "SMAP" - System MAP */ 27 #define E820_SIGNATURE 0x534d4150 28 29 struct e820info { 30 u32 sign; /* "SMAP" signature */ 31 u32 x0; /* don't care, used by VxWorks */ 32 u32 x1; /* don't care, used by VxWorks */ 33 u32 x2; /* don't care, used by VxWorks */ 34 u32 addr; /* last e820 table entry addr */ 35 u32 x3; /* don't care, used by VxWorks */ 36 u32 entries; /* e820 table entry count */ 37 u32 error; /* must be zero */ 38 }; 39 40 int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]); 41 void boot_prep_vxworks(bootm_headers_t *images); 42 void boot_jump_vxworks(bootm_headers_t *images); 43 void do_bootvx_fdt(bootm_headers_t *images); 44 45 #endif 46