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1.1 root 1: #ifndef COMBOOT_H
2: #define COMBOOT_H
3:
4: /**
5: * @file
6: *
7: * SYSLINUX COMBOOT
8: */
9:
10: FILE_LICENCE ( GPL2_OR_LATER );
11:
12: #include <stdint.h>
13: #include <setjmp.h>
14: #include <ipxe/in.h>
15:
16: /** Descriptor in a 32-bit IDT */
17: struct idt_descriptor {
18: uint16_t offset_low;
19: uint16_t selector;
20: uint16_t flags;
21: uint16_t offset_high;
22: } __attribute__ (( packed ));
23:
24: /** Operand for the LIDT instruction */
25: struct idt_register {
26: uint16_t limit;
27: uint32_t base;
28: } __attribute__ (( packed ));
29:
30: /** Entry in the interrupt jump buffer */
31: struct ijb_entry {
32: uint8_t pusha_instruction;
33: uint8_t mov_instruction;
34: uint8_t mov_value;
35: uint8_t jump_instruction;
36: uint32_t jump_destination;
37: } __attribute__ (( packed ));
38:
39: /** The x86 opcode for "pushal" */
40: #define IJB_PUSHA 0x60
41:
42: /** The x86 opcode for "movb $imm8,%al" */
43: #define IJB_MOV_AL_IMM8 0xB0
44:
45: /** The x86 opcode for "jmp rel32" */
46: #define IJB_JMP_REL32 0xE9
47:
48: /** Flags that specify a 32-bit interrupt gate with DPL=0 */
49: #define IDT_INTERRUPT_GATE_FLAGS 0x8E00
50:
51: /** Address of COM32 interrupt descriptor table */
52: #define COM32_IDT 0x100000
53:
54: /** Number of entries in a fully populated IDT */
55: #define COM32_NUM_IDT_ENTRIES 256
56:
57: /** Address of COM32 interrupt jump buffer */
58: #define COM32_IJB 0x100800
59:
60: /** Segment used for COMBOOT PSP and image */
61: #define COMBOOT_PSP_SEG 0x07C0
62:
63: /** Entry point address of COM32 images */
64: #define COM32_START_PHYS 0x101000
65:
66: /** COM32 bounce buffer segment */
67: #define COM32_BOUNCE_SEG 0x07C0
68:
69: /** Size of SYSLINUX file block in bytes */
70: #define COMBOOT_FILE_BLOCKSZ 512
71:
72: /** COMBOOT feature flags (INT 22h AX=15h) */
73: #define COMBOOT_FEATURE_LOCAL_BOOT (1 << 0)
74: #define COMBOOT_FEATURE_IDLE_LOOP (1 << 1)
75:
76: /** Maximum number of shuffle descriptors for
77: * shuffle and boot functions
78: * (INT 22h AX=0012h, 001Ah, 001Bh)
79: */
80: #define COMBOOT_MAX_SHUFFLE_DESCRIPTORS 682
81:
82: typedef union {
83: uint32_t l;
84: uint16_t w[2];
85: uint8_t b[4];
86: } com32_reg32_t;
87:
88: typedef struct {
89: uint16_t gs; /* Offset 0 */
90: uint16_t fs; /* Offset 2 */
91: uint16_t es; /* Offset 4 */
92: uint16_t ds; /* Offset 6 */
93:
94: com32_reg32_t edi; /* Offset 8 */
95: com32_reg32_t esi; /* Offset 12 */
96: com32_reg32_t ebp; /* Offset 16 */
97: com32_reg32_t _unused_esp; /* Offset 20 */
98: com32_reg32_t ebx; /* Offset 24 */
99: com32_reg32_t edx; /* Offset 28 */
100: com32_reg32_t ecx; /* Offset 32 */
101: com32_reg32_t eax; /* Offset 36 */
102:
103: com32_reg32_t eflags; /* Offset 40 */
104: } com32sys_t;
105:
106: typedef struct {
107: uint32_t eax; /* Offset 0 */
108: uint32_t ecx; /* Offset 4 */
109: uint32_t edx; /* Offset 8 */
110: uint32_t ebx; /* Offset 12 */
111: uint32_t esp; /* Offset 16 */
112: uint32_t ebp; /* Offset 20 */
113: uint32_t esi; /* Offset 24 */
114: uint32_t edi; /* Offset 28 */
115:
116: uint32_t eip; /* Offset 32 */
117: } syslinux_pm_regs;
118:
119: typedef struct {
120: uint16_t es; /* Offset 0 */
121: uint16_t _unused_cs; /* Offset 2 */
122: uint16_t ds; /* Offset 4 */
123: uint16_t ss; /* Offset 6 */
124: uint16_t fs; /* Offset 8 */
125: uint16_t gs; /* Offset 10 */
126:
127: uint32_t eax; /* Offset 12 */
128: uint32_t ecx; /* Offset 16 */
129: uint32_t edx; /* Offset 20 */
130: uint32_t ebx; /* Offset 24 */
131: uint32_t esp; /* Offset 28 */
132: uint32_t ebp; /* Offset 32 */
133: uint32_t esi; /* Offset 36 */
134: uint32_t edi; /* Offset 40 */
135:
136: uint16_t ip; /* Offset 44 */
137: uint16_t cs; /* Offset 46 */
138: } syslinux_rm_regs;
139:
140: typedef struct {
141: uint32_t dest;
142: uint32_t src;
143: uint32_t len;
144: } comboot_shuffle_descriptor;
145:
146: extern void hook_comboot_interrupts ( );
147: extern void unhook_comboot_interrupts ( );
148:
149: /* These are not the correct prototypes, but it doens't matter,
150: * as we only ever get the address of these functions;
151: * they are only called from COM32 code running in PHYS_CODE
152: */
153: extern void com32_intcall_wrapper ( );
154: extern void com32_farcall_wrapper ( );
155: extern void com32_cfarcall_wrapper ( );
156: extern void com32_irq_wrapper ( );
157:
158: /* Resolve a hostname to an (IPv4) address */
159: extern int comboot_resolv ( const char *name, struct in_addr *address );
160:
161: /* setjmp/longjmp context buffer used to return after loading an image */
162: extern rmjmp_buf comboot_return;
163:
164: extern void *com32_external_esp;
165:
166: #define COMBOOT_EXIT 1
167: #define COMBOOT_EXIT_RUN_KERNEL 2
168: #define COMBOOT_EXIT_COMMAND 3
169:
170: extern void comboot_force_text_mode ( void );
171:
172: #define COMBOOT_VIDEO_GRAPHICS 0x01
173: #define COMBOOT_VIDEO_NONSTANDARD 0x02
174: #define COMBOOT_VIDEO_VESA 0x04
175: #define COMBOOT_VIDEO_NOTEXT 0x08
176:
177: #endif
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