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.
15 #define CR0_PG (1<<31) // Paging
16 #define CR0_CD (1<<30) // Cache disable
17 #define CR0_NW (1<<29) // Not Write-through
18 #define CR0_PE (1<<0) // Protection enable
23 /****************************************************************
24 * Registers saved/restored in romlayout.S
25 ****************************************************************/
27 #include "types.h" // u16
29 #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; }; }
31 // Layout of registers passed in to irq handlers. Note that this
32 // layout corresponds to code in romlayout.S - don't change it here
33 // without also updating the assembler code.
37 UREG(edi, di, di_hi, di_lo);
38 UREG(esi, si, si_hi, si_lo);
39 UREG(ebx, bx, bh, bl);
40 UREG(edx, dx, dh, dl);
41 UREG(ecx, cx, ch, cl);
42 UREG(eax, ax, ah, al);
49 /****************************************************************
51 ****************************************************************/
54 set_cf(struct bregs *regs, int cond)
62 // Frequently used return codes
63 #define RET_EUNSUPPORTED 0x86
66 set_success(struct bregs *regs)
72 set_code_success(struct bregs *regs)
79 set_fail_silent(struct bregs *regs)
85 set_code_fail_silent(struct bregs *regs, u8 code)
91 #define set_fail(regs) \
92 __set_fail(__func__, __LINE__, (regs))
93 #define set_code_fail(regs, code) \
94 __set_code_fail(__func__, __LINE__, (regs), (code))
97 void __set_fail(const char *fname, int lineno, struct bregs *regs);
98 void __set_code_fail(const char *fname, int lineno, struct bregs *regs, u8 code);
100 #endif // !__ASSEMBLY__