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Annotation of qemu/roms/seabios/src/bregs.h, revision 1.1.1.4

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)
1.1.1.4 ! root       14: #define F_ID (1<<21)
1.1       root       15: 
                     16: // CR0 flags
                     17: #define CR0_PG (1<<31) // Paging
                     18: #define CR0_CD (1<<30) // Cache disable
                     19: #define CR0_NW (1<<29) // Not Write-through
                     20: #define CR0_PE (1<<0)  // Protection enable
                     21: 
                     22: 
                     23: #ifndef __ASSEMBLY__
                     24: 
                     25: #include "farptr.h" // struct segoff_s
                     26: 
                     27: /****************************************************************
                     28:  * Registers saved/restored in romlayout.S
                     29:  ****************************************************************/
                     30: 
                     31: #include "types.h" // u16
                     32: 
                     33: #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; }; }
                     34: 
                     35: // Layout of registers passed in to irq handlers.  Note that this
                     36: // layout corresponds to code in romlayout.S - don't change it here
                     37: // without also updating the assembler code.
                     38: struct bregs {
                     39:     u16 ds;
                     40:     u16 es;
1.1.1.3   root       41:     UREG(edi, di, di8u, di8l);
                     42:     UREG(esi, si, si8u, si8l);
                     43:     UREG(ebp, bp, bp8u, bp8l);
1.1       root       44:     UREG(ebx, bx, bh, bl);
                     45:     UREG(edx, dx, dh, dl);
                     46:     UREG(ecx, cx, ch, cl);
                     47:     UREG(eax, ax, ah, al);
                     48:     struct segoff_s code;
                     49:     u16 flags;
                     50: } PACKED;
                     51: 
                     52: 
                     53: /****************************************************************
                     54:  * Helper functions
                     55:  ****************************************************************/
                     56: 
                     57: static inline void
                     58: set_cf(struct bregs *regs, int cond)
                     59: {
                     60:     if (cond)
                     61:         regs->flags |= F_CF;
                     62:     else
                     63:         regs->flags &= ~F_CF;
                     64: }
                     65: 
                     66: // Frequently used return codes
                     67: #define RET_EUNSUPPORTED 0x86
                     68: 
                     69: static inline void
                     70: set_success(struct bregs *regs)
                     71: {
                     72:     set_cf(regs, 0);
                     73: }
                     74: 
                     75: static inline void
                     76: set_code_success(struct bregs *regs)
                     77: {
                     78:     regs->ah = 0;
                     79:     set_cf(regs, 0);
                     80: }
                     81: 
                     82: static inline void
                     83: set_invalid_silent(struct bregs *regs)
                     84: {
                     85:     set_cf(regs, 1);
                     86: }
                     87: 
                     88: static inline void
                     89: set_code_invalid_silent(struct bregs *regs, u8 code)
                     90: {
                     91:     regs->ah = code;
                     92:     set_cf(regs, 1);
                     93: }
                     94: 
                     95: #endif // !__ASSEMBLY__
                     96: 
                     97: #endif // bregs.h

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