1/* ----------------------------------------------------------------------- *
2 *
3 *   Copyright 2001-2008 H. Peter Anvin - All Rights Reserved
4 *
5 *   This program is free software; you can redistribute it and/or modify
6 *   it under the terms of the GNU General Public License as published by
7 *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
8 *   Boston MA 02111-1307, USA; either version 2 of the License, or
9 *   (at your option) any later version; incorporated herein by reference.
10 *
11 * ----------------------------------------------------------------------- */
12
13/*
14 * memdisk.h
15 *
16 * Miscellaneous header definitions
17 */
18
19#ifndef MEMDISK_H
20#define MEMDISK_H
21
22#include <stddef.h>
23
24/* We use the com32 interface for calling 16-bit code */
25#include <com32.h>
26
27/* define it only for i386 */
28#if __SIZEOF_POINTER__ == 4
29#define __cdecl __attribute__((cdecl,regparm(0)))
30#endif
31
32void __cdecl intcall(uint8_t, com32sys_t *, com32sys_t *);
33
34/* Structure passed in from the real-mode code */
35struct real_mode_args {
36    uint32_t rm_return;
37    uint32_t rm_intcall;
38    uint32_t rm_bounce;
39    uint32_t rm_base;
40    uint32_t rm_handle_interrupt;
41    uint32_t rm_gdt;
42    uint32_t rm_size;
43    uint32_t rm_pmjmp;
44    uint32_t rm_rmjmp;
45};
46extern struct real_mode_args rm_args;
47#define sys_bounce ((void *)rm_args.rm_bounce)
48
49/* This is the header in the boot sector/setup area */
50struct setup_header {
51    char cmdline[0x1f1];
52    uint8_t setup_secs;
53    uint16_t syssize;
54    uint16_t swap_dev;
55    uint16_t ram_size;
56    uint16_t vid_mode;
57    uint16_t root_dev;
58    uint16_t boot_flag;
59    uint16_t jump;
60    char header[4];
61    uint16_t version;
62    uint32_t realmode_swtch;
63    uint32_t start_sys;
64    uint8_t type_of_loader;
65    uint8_t loadflags;
66    uint16_t setup_move_size;
67    uint32_t code32_start;
68    uint32_t ramdisk_image;
69    uint32_t ramdisk_size;
70    uint32_t bootsect_kludge;
71    uint16_t head_end_ptr;
72    uint16_t pad1;
73    uint32_t cmd_line_ptr;
74    uint32_t initrd_addr_max;
75    uint32_t esdi;
76    uint32_t edx;
77    uint32_t sssp;
78    uint32_t csip;
79};
80#define shdr ((struct setup_header *)rm_args.rm_base)
81
82/* Standard routines */
83void *memcpy(void *, const void *, size_t);
84void *memset(void *, int, size_t);
85void *memmove(void *, const void *, size_t);
86
87#define strcpy(a,b)   __builtin_strcpy(a,b)
88
89static inline size_t strlen(const char *__a)
90{
91    const char *__D;
92    size_t __c;
93
94asm("repne;scasb":"=D"(__D), "=c"(__c)
95:	"D"(__a), "c"(-1), "a"(0), "m"(*__a));
96
97    return __D - __a - 1;
98}
99
100/* memcpy() but returns a pointer to end of buffer */
101static inline void *mempcpy(void *__d, const void *__s, unsigned int __n)
102{
103    memcpy(__d, __s, __n);
104    return (void *)((char *)__d + __n);
105}
106
107/* memcmp() */
108static inline int memcmp(const void *__a, const void *__b, unsigned int __n)
109{
110    const unsigned char *__aa = __a;
111    const unsigned char *__bb = __b;
112    int __d;
113
114    while (__n--) {
115	__d = *__bb++ - *__aa++;
116	if (__d)
117	    return __d;
118    }
119
120    return 0;
121}
122
123static inline void sti(void)
124{
125    asm volatile("sti");
126}
127
128static inline void cli(void)
129{
130    asm volatile("cli");
131}
132
133/* Decompression */
134extern int check_zip(void *indata, uint32_t size, uint32_t * zbytes_p,
135		     uint32_t * dbytes_p, uint32_t * orig_crc,
136		     uint32_t * offset_p);
137extern void *unzip(void *indata, uint32_t zbytes, uint32_t dbytes,
138		   uint32_t orig_crc, void *target);
139
140#endif
141