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
32 void __cdecl intcall(uint8_t, com32sys_t *, com32sys_t *);
33
34 /* Structure passed in from the real-mode code */
35 struct 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 };
46 extern 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 */
50 struct 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 */
83 void *memcpy(void *, const void *, size_t);
84 void *memset(void *, int, size_t);
85 void *memmove(void *, const void *, size_t);
86
87 #define strcpy(a,b) __builtin_strcpy(a,b)
88
strlen(const char * __a)89 static inline size_t strlen(const char *__a)
90 {
91 const char *__D;
92 size_t __c;
93
94 asm("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 */
mempcpy(void * __d,const void * __s,unsigned int __n)101 static 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() */
memcmp(const void * __a,const void * __b,unsigned int __n)108 static 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
sti(void)123 static inline void sti(void)
124 {
125 asm volatile("sti");
126 }
127
cli(void)128 static inline void cli(void)
129 {
130 asm volatile("cli");
131 }
132
133 /* Decompression */
134 extern 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);
137 extern void *unzip(void *indata, uint32_t zbytes, uint32_t dbytes,
138 uint32_t orig_crc, void *target);
139
140 #endif
141