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1.1 root 1: // Structure layout of cpu registers the the bios uses.
2: //
3: // Copyright (C) 2008 Kevin O'Connor <[email protected]>
4: //
5: // This file may be distributed under the terms of the GNU LGPLv3 license.
6:
7: #ifndef __BREGS_H
8: #define __BREGS_H
9:
10: // CPU flag bitdefs
11: #define F_CF (1<<0)
12: #define F_ZF (1<<6)
13: #define F_IF (1<<9)
14:
15: // CR0 flags
16: #define CR0_PG (1<<31) // Paging
17: #define CR0_CD (1<<30) // Cache disable
18: #define CR0_NW (1<<29) // Not Write-through
19: #define CR0_PE (1<<0) // Protection enable
20:
21:
22: #ifndef __ASSEMBLY__
23:
24: #include "farptr.h" // struct segoff_s
25:
26: /****************************************************************
27: * Registers saved/restored in romlayout.S
28: ****************************************************************/
29:
30: #include "types.h" // u16
31:
32: #define UREG(ER, R, RH, RL) union { u32 ER; struct { u16 R; u16 R ## _hi; }; struct { u8 RL; u8 RH; u8 R ## _hilo; u8 R ## _hihi; }; }
33:
34: // Layout of registers passed in to irq handlers. Note that this
35: // layout corresponds to code in romlayout.S - don't change it here
36: // without also updating the assembler code.
37: struct bregs {
38: u16 ds;
39: u16 es;
40: UREG(edi, di, di_hi, di_lo);
41: UREG(esi, si, si_hi, si_lo);
42: UREG(ebp, bp, bp_hi, bp_lo);
43: UREG(ebx, bx, bh, bl);
44: UREG(edx, dx, dh, dl);
45: UREG(ecx, cx, ch, cl);
46: UREG(eax, ax, ah, al);
47: struct segoff_s code;
48: u16 flags;
49: } PACKED;
50:
51:
52: /****************************************************************
53: * Helper functions
54: ****************************************************************/
55:
56: static inline void
57: set_cf(struct bregs *regs, int cond)
58: {
59: if (cond)
60: regs->flags |= F_CF;
61: else
62: regs->flags &= ~F_CF;
63: }
64:
65: // Frequently used return codes
66: #define RET_EUNSUPPORTED 0x86
67:
68: static inline void
69: set_success(struct bregs *regs)
70: {
71: set_cf(regs, 0);
72: }
73:
74: static inline void
75: set_code_success(struct bregs *regs)
76: {
77: regs->ah = 0;
78: set_cf(regs, 0);
79: }
80:
81: static inline void
82: set_invalid_silent(struct bregs *regs)
83: {
84: set_cf(regs, 1);
85: }
86:
87: static inline void
88: set_code_invalid_silent(struct bregs *regs, u8 code)
89: {
90: regs->ah = code;
91: set_cf(regs, 1);
92: }
93:
94: #define warn_invalid(regs) \
95: __warn_invalid((regs), __LINE__, __func__)
96: #define set_invalid(regs) \
97: __set_invalid((regs), __LINE__, __func__)
98: #define set_code_invalid(regs, code) \
99: __set_code_invalid((regs), (code) | (__LINE__ << 8), __func__)
100:
101: #define warn_unimplemented(regs) \
102: __warn_unimplemented((regs), __LINE__, __func__)
103: #define set_unimplemented(regs) \
104: __set_unimplemented((regs), __LINE__, __func__)
105: #define set_code_unimplemented(regs, code) \
106: __set_code_unimplemented((regs), (code) | (__LINE__ << 8), __func__)
107:
108: // output.c
109: void __warn_invalid(struct bregs *regs, int lineno, const char *fname);
110: void __warn_unimplemented(struct bregs *regs, int lineno, const char *fname);
111: void __set_invalid(struct bregs *regs, int lineno, const char *fname);
112: void __set_unimplemented(struct bregs *regs, int lineno, const char *fname);
113: void __set_code_invalid(struct bregs *regs, u32 linecode, const char *fname);
114: void __set_code_unimplemented(struct bregs *regs, u32 linecode
115: , const char *fname);
116:
117: #endif // !__ASSEMBLY__
118:
119: #endif // bregs.h
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