aboutsummaryrefslogtreecommitdiffstats
path: root/gpxe/src/arch/i386/include/comboot.h
blob: 1232f0a74cce4d2152c1feb7e6dfd42bf4ff237f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
#ifndef COMBOOT_H
#define COMBOOT_H

/**
 * @file
 *
 * SYSLINUX COMBOOT
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <stdint.h>
#include <setjmp.h>
#include <gpxe/in.h>

/** Segment used for COMBOOT PSP and image */
#define COMBOOT_PSP_SEG 0x07C0

/** Entry point address of COM32 images */
#define COM32_START_PHYS 0x101000

/** COM32 bounce buffer segment */
#define COM32_BOUNCE_SEG 0x07C0

/** Size of SYSLINUX file block in bytes */
#define COMBOOT_FILE_BLOCKSZ 512

/** COMBOOT feature flags (INT 22h AX=15h) */
#define COMBOOT_FEATURE_LOCAL_BOOT (1 << 0)
#define COMBOOT_FEATURE_IDLE_LOOP  (1 << 1)

/** Maximum number of shuffle descriptors for 
 * shuffle and boot functions
 * (INT 22h AX=0012h, 001Ah, 001Bh)
 */
#define COMBOOT_MAX_SHUFFLE_DESCRIPTORS 682

typedef union {
	uint32_t l;
	uint16_t w[2];
	uint8_t  b[4];
} com32_reg32_t;

typedef struct {
	uint16_t gs;                /* Offset  0 */
	uint16_t fs;                /* Offset  2 */
	uint16_t es;                /* Offset  4 */
	uint16_t ds;                /* Offset  6 */

	com32_reg32_t edi;          /* Offset  8 */
	com32_reg32_t esi;          /* Offset 12 */
	com32_reg32_t ebp;          /* Offset 16 */
	com32_reg32_t _unused_esp;  /* Offset 20 */
	com32_reg32_t ebx;          /* Offset 24 */
	com32_reg32_t edx;          /* Offset 28 */
	com32_reg32_t ecx;          /* Offset 32 */
	com32_reg32_t eax;          /* Offset 36 */

	com32_reg32_t eflags;       /* Offset 40 */
} com32sys_t;

typedef struct {
	uint32_t eax;               /* Offset  0 */
	uint32_t ecx;               /* Offset  4 */
	uint32_t edx;               /* Offset  8 */
	uint32_t ebx;               /* Offset 12 */
	uint32_t esp;               /* Offset 16 */
	uint32_t ebp;               /* Offset 20 */
	uint32_t esi;               /* Offset 24 */
	uint32_t edi;               /* Offset 28 */

	uint32_t eip;               /* Offset 32 */
} syslinux_pm_regs;

typedef struct {
	uint16_t es;                /* Offset  0 */
	uint16_t _unused_cs;        /* Offset  2 */
	uint16_t ds;                /* Offset  4 */
	uint16_t ss;                /* Offset  6 */
	uint16_t fs;                /* Offset  8 */
	uint16_t gs;                /* Offset 10 */

	uint32_t eax;                /* Offset 12 */
	uint32_t ecx;                /* Offset 16 */
	uint32_t edx;                /* Offset 20 */
	uint32_t ebx;                /* Offset 24 */
	uint32_t esp;                /* Offset 28 */
	uint32_t ebp;                /* Offset 32 */
	uint32_t esi;                /* Offset 36 */
	uint32_t edi;                /* Offset 40 */

	uint16_t ip;                /* Offset 44 */
	uint16_t cs;                /* Offset 46 */
} syslinux_rm_regs;

typedef struct {
	uint32_t dest;
	uint32_t src;
	uint32_t len;
} comboot_shuffle_descriptor;

extern void hook_comboot_interrupts ( );
extern void unhook_comboot_interrupts ( );

/* These are not the correct prototypes, but it doens't matter, 
 * as we only ever get the address of these functions;
 * they are only called from COM32 code running in PHYS_CODE
 */
extern void com32_intcall_wrapper ( );
extern void com32_farcall_wrapper ( );
extern void com32_cfarcall_wrapper ( );

/* Resolve a hostname to an (IPv4) address */
extern int comboot_resolv ( const char *name, struct in_addr *address );

/* setjmp/longjmp context buffer used to return after loading an image */
extern rmjmp_buf comboot_return;

/* Replacement image when exiting with COMBOOT_EXIT_RUN_KERNEL */
extern struct image *comboot_replacement_image;

extern void *com32_external_esp;

#define COMBOOT_EXIT 1
#define COMBOOT_EXIT_RUN_KERNEL 2
#define COMBOOT_EXIT_COMMAND 3

extern void comboot_force_text_mode ( void );

#define COMBOOT_VIDEO_GRAPHICS    0x01
#define COMBOOT_VIDEO_NONSTANDARD 0x02
#define COMBOOT_VIDEO_VESA        0x04
#define COMBOOT_VIDEO_NOTEXT      0x08

#endif