1/*- 2 * Copyright (c) 2012 Andriy Gapon <avg@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are freely 6 * permitted provided that the above copyright notice and this 7 * paragraph and the following disclaimer are duplicated in all 8 * such forms. 9 * 10 * This software is provided "AS IS" and without any express or 11 * implied warranties, including, without limitation, the implied 12 * warranties of merchantability and fitness for a particular 13 * purpose. 14 * 15 * $FreeBSD$ 16 */ 17 18#ifndef _BOOT_I386_ARGS_H_ 19#define _BOOT_I386_ARGS_H_ 20 21#define KARGS_FLAGS_CD 0x1 22#define KARGS_FLAGS_PXE 0x2 23#define KARGS_FLAGS_ZFS 0x4 24#define KARGS_FLAGS_EXTARG 0x8 /* variably sized extended argument */ 25 26#define BOOTARGS_SIZE 24 /* sizeof(struct bootargs) */ 27#define BA_BOOTFLAGS 8 /* offsetof(struct bootargs, bootflags) */ 28#define BA_BOOTINFO 20 /* offsetof(struct bootargs, bootinfo) */ 29#define BI_SIZE 48 /* offsetof(struct bootinfo, bi_size) */ 30 31/* 32 * We reserve some space above BTX allocated stack for the arguments 33 * and certain data that could hang off them. Currently only struct bootinfo 34 * is supported in that category. The bootinfo is placed at the top 35 * of the arguments area and the actual arguments are placed at ARGOFF offset 36 * from the top and grow towards the top. Hopefully we have enough space 37 * for bootinfo and the arguments to not run into each other. 38 * Arguments area below ARGOFF is reserved for future use. 39 */ 40#define ARGSPACE 0x1000 /* total size of the BTX args area */ 41#define ARGOFF 0x800 /* actual args offset within the args area */ 42#define ARGADJ (ARGSPACE - ARGOFF) 43 44#ifndef __ASSEMBLER__ 45 46struct bootargs 47{ 48 uint32_t howto; 49 uint32_t bootdev; 50 uint32_t bootflags; 51 union { 52 struct { 53 uint32_t pxeinfo; 54 uint32_t reserved; 55 }; 56 uint64_t zfspool; 57 }; 58 uint32_t bootinfo; 59 60 /* 61 * If KARGS_FLAGS_EXTARG is set in bootflags, then the above fields 62 * are followed by a uint32_t field that specifies a size of the 63 * extended arguments (including the size field). 64 */ 65}; 66 67#endif /*__ASSEMBLER__*/ 68 69#endif /* !_BOOT_I386_ARGS_H_ */ 70