104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
// Structure layout of cpu registers the the bios uses.
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//
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// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU LGPLv3 license.
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#ifndef __BREGS_H
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#define __BREGS_H
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// CPU flag bitdefs
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#define F_CF (1<<0)
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#define F_ZF (1<<6)
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#define F_IF (1<<9)
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// CR0 flags
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#define CR0_PG (1<<31) // Paging
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#define CR0_CD (1<<30) // Cache disable
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#define CR0_NW (1<<29) // Not Write-through
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#define CR0_PE (1<<0) // Protection enable
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#ifndef __ASSEMBLY__
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/****************************************************************
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* Registers saved/restored in romlayout.S
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****************************************************************/
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#include "types.h" // u16
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#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; }; }
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// Layout of registers passed in to irq handlers. Note that this
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// layout corresponds to code in romlayout.S - don't change it here
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// without also updating the assembler code.
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struct bregs {
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u16 ds;
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u16 es;
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UREG(edi, di, di_hi, di_lo);
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UREG(esi, si, si_hi, si_lo);
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UREG(ebx, bx, bh, bl);
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UREG(edx, dx, dh, dl);
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UREG(ecx, cx, ch, cl);
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UREG(eax, ax, ah, al);
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u16 ip;
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u16 cs;
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u16 flags;
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} PACKED;
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/****************************************************************
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* Helper functions
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****************************************************************/
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static inline void
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set_cf(struct bregs *regs, int cond)
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{
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if (cond)
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regs->flags |= F_CF;
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else
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regs->flags &= ~F_CF;
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}
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// Frequently used return codes
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#define RET_EUNSUPPORTED 0x86
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static inline void
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set_success(struct bregs *regs)
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{
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set_cf(regs, 0);
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}
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static inline void
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set_code_success(struct bregs *regs)
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{
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regs->ah = 0;
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set_cf(regs, 0);
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}
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static inline void
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set_fail_silent(struct bregs *regs)
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{
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set_cf(regs, 1);
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}
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static inline void
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set_code_fail_silent(struct bregs *regs, u8 code)
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{
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regs->ah = code;
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set_cf(regs, 1);
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}
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#define set_fail(regs) \
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__set_fail((regs), __LINE__, __func__)
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#define set_code_fail(regs, code) \
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__set_code_fail((regs), (code) | (__LINE__ << 8), __func__)
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// output.c
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void __set_fail(struct bregs *regs, int lineno, const char *fname);
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void __set_code_fail(struct bregs *regs, u32 linecode, const char *fname);
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#endif // !__ASSEMBLY__
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#endif // bregs.h
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