/*
 * Copyright (c) 2012 Andriy Gapon <avg@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are freely
 * permitted provided that the above copyright notice and this
 * paragraph and the following disclaimer are duplicated in all
 * such forms.
 *
 * This software is provided "AS IS" and without any express or
 * implied warranties, including, without limitation, the implied
 * warranties of merchantability and fitness for a particular
 * purpose.
 */

#ifndef _BOOT_I386_ARGS_H_
#define _BOOT_I386_ARGS_H_

#define KARGS_FLAGS_CD          0x1
#define KARGS_FLAGS_PXE         0x2
#define KARGS_FLAGS_ZFS         0x4
#define KARGS_FLAGS_EXTARG      0x8     /* variably sized extended argument */

#define BOOTARGS_SIZE   24      /* sizeof(struct bootargs) */
#define BA_BOOTFLAGS    8       /* offsetof(struct bootargs, bootflags) */
#define BA_BOOTINFO     20      /* offsetof(struct bootargs, bootinfo) */
#define BI_SIZE         48      /* offsetof(struct bootinfo, bi_size) */

/*
 * We reserve some space above BTX allocated stack for the arguments
 * and certain data that could hang off them.  Currently only struct bootinfo
 * is supported in that category.  The bootinfo is placed at the top
 * of the arguments area and the actual arguments are placed at ARGOFF offset
 * from the top and grow towards the top.  Hopefully we have enough space
 * for bootinfo and the arguments to not run into each other.
 * Arguments area below ARGOFF is reserved for future use.
 */
#define ARGSPACE        0x1000  /* total size of the BTX args area */
#define ARGOFF          0x800   /* actual args offset within the args area */
#define ARGADJ          (ARGSPACE - ARGOFF)

#ifndef __ASSEMBLER__

struct bootargs {
        uint32_t                        howto;
        uint32_t                        bootdev;
        uint32_t                        bootflags;
        union {
                struct {
                        uint32_t        pxeinfo;
                        uint32_t        reserved;
                };
                uint64_t                zfspool;
        };
        uint32_t                        bootinfo;

        /*
         * If KARGS_FLAGS_EXTARG is set in bootflags, then the above fields
         * are followed by a uint32_t field that specifies a size of the
         * extended arguments (including the size field).
         */
};

struct zfs_boot_args {
        uint32_t                size;
        uint32_t                reserved;
        uint64_t                pool;
        uint64_t                root;
        uint64_t                primary_pool;
        uint64_t                primary_vdev;
};

#endif /* __ASSEMBLER__ */

#endif  /* !_BOOT_I386_ARGS_H_ */