1 // Structure layout of cpu registers the the bios uses.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
5 // This file may be distributed under the terms of the GNU GPLv3 license.
11 /****************************************************************
12 * Registers saved/restored in romlayout.S
13 ****************************************************************/
15 #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; }; }
17 // Layout of registers passed in to irq handlers. Note that this
18 // layout corresponds to code in romlayout.S - don't change it here
19 // without also updating the assembler code.
23 UREG(edi, di, di_hi, di_lo);
24 UREG(esi, si, si_hi, si_lo);
25 UREG(ebx, bx, bh, bl);
26 UREG(edx, dx, dh, dl);
27 UREG(ecx, cx, ch, cl);
28 UREG(eax, ax, ah, al);
35 /****************************************************************
37 ****************************************************************/
39 // bregs flags bitdefs
44 set_cf(struct bregs *regs, int cond)
52 // Frequently used return codes
53 #define RET_EUNSUPPORTED 0x86
56 set_success(struct bregs *regs)
62 set_code_success(struct bregs *regs)
69 set_fail_silent(struct bregs *regs)
75 set_code_fail_silent(struct bregs *regs, u8 code)
81 #define set_fail(regs) \
82 __set_fail(__func__, __LINE__, (regs))
83 #define set_code_fail(regs, code) \
84 __set_code_fail(__func__, __LINE__, (regs), (code))
87 void __set_fail(const char *fname, int lineno, struct bregs *regs);
88 void __set_code_fail(const char *fname, int lineno, struct bregs *regs, u8 code);