112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/*-
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* Copyright (c) 2012 Andriy Gapon <avg@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are freely
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* permitted provided that the above copyright notice and this
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* paragraph and the following disclaimer are duplicated in all
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* such forms.
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*
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* This software is provided "AS IS" and without any express or
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* implied warranties, including, without limitation, the implied
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* warranties of merchantability and fitness for a particular
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* purpose.
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*
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* $FreeBSD$
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*/
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#ifndef _BOOT_I386_ARGS_H_
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#define _BOOT_I386_ARGS_H_
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#define KARGS_FLAGS_CD 0x1
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#define KARGS_FLAGS_PXE 0x2
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#define KARGS_FLAGS_ZFS 0x4
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#define KARGS_FLAGS_EXTARG 0x8 /* variably sized extended argument */
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#define BOOTARGS_SIZE 24 /* sizeof(struct bootargs) */
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#define BA_BOOTFLAGS 8 /* offsetof(struct bootargs, bootflags) */
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#define BA_BOOTINFO 20 /* offsetof(struct bootargs, bootinfo) */
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#define BI_SIZE 48 /* offsetof(struct bootinfo, bi_size) */
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/*
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* We reserve some space above BTX allocated stack for the arguments
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* and certain data that could hang off them. Currently only struct bootinfo
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* is supported in that category. The bootinfo is placed at the top
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* of the arguments area and the actual arguments are placed at ARGOFF offset
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* from the top and grow towards the top. Hopefully we have enough space
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* for bootinfo and the arguments to not run into each other.
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* Arguments area below ARGOFF is reserved for future use.
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*/
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#define ARGSPACE 0x1000 /* total size of the BTX args area */
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#define ARGOFF 0x800 /* actual args offset within the args area */
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#define ARGADJ (ARGSPACE - ARGOFF)
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#ifndef __ASSEMBLER__
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/*
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* This struct describes the contents of the stack on entry to btxldr.S. This
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* is the data that follows the return address, so it begins at 4(%esp). On
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* the sending side, this data is passed as individual args to __exec(). On the
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* receiving side, code in btxldr.S copies the data from the entry stack to a
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* known fixed location in the new address space. Then, btxcsu.S sets the
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* global variable __args to point to that known fixed location before calling
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* main(), which casts __args to a struct bootargs pointer to access the data.
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* The btxldr.S code is aware of KARGS_FLAGS_EXTARG, and if it's set, the extra
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* args data is copied along with the other bootargs from the entry stack to the
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* fixed location in the new address space.
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*
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* The bootinfo field is actually a pointer to a bootinfo struct that has been
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* converted to uint32_t using VTOP(). On the receiving side it must be
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* converted back to a pointer using PTOV(). Code in btxldr.S is aware of this
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* field and if it's non-NULL it copies the data it points to into another known
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* fixed location, and adjusts the bootinfo field to point to that new location.
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*/
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struct bootargs
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{
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uint32_t howto;
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uint32_t bootdev;
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uint32_t bootflags;
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union {
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struct {
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uint32_t pxeinfo;
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uint32_t reserved;
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};
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uint64_t zfspool;
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};
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uint32_t bootinfo;
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/*
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* If KARGS_FLAGS_EXTARG is set in bootflags, then the above fields
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* are followed by a uint32_t field that specifies a size of the
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* extended arguments (including the size field).
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*/
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};
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#ifdef LOADER_GELI_SUPPORT
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#include <crypto/intake.h>
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#endif
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struct geli_boot_args
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{
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uint32_t size;
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union {
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char gelipw[256];
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struct {
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char notapw; /*
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* single null byte to stop keybuf
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* being interpreted as a password
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*/
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uint32_t keybuf_sentinel;
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#ifdef LOADER_GELI_SUPPORT
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struct keybuf *keybuf;
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#else
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void *keybuf;
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#endif
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};
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};
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};
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#endif /*__ASSEMBLER__*/
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#endif /* !_BOOT_I386_ARGS_H_ */
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