source: xtideuniversalbios/trunk/Assembly_Library/Inc/Registers.inc@ 156

; Project name  :   Assembly Library
; Description   :   Register related macros.
%ifndef REGISTERS_INC
%define REGISTERS_INC

struc INTPACK
%ifdef USE_386
    .gs             resb    2
    .fs             resb    2
%endif
    .es             resb    2
    .ds             resb    2
    .di             resb    2
    .si             resb    2
    .bp             resb    2
    .sp             resb    2
    .bx:
    .bl             resb    1
    .bh             resb    1
    .dx:
    .dl             resb    1
    .dh             resb    1
    .cx:
    .cl             resb    1
    .ch             resb    1
    .ax:
    .al             resb    1
    .ah             resb    1
    .ip             resb    2
    .cs             resb    2
    .flags          resb    2
endstruc

; 8086/8088 FLAGS
FLG_FLAGS_CF        EQU (1<<0)
FLG_FLAGS_PF        EQU (1<<2)
FLG_FLAGS_AF        EQU (1<<4)
FLG_FLAGS_ZF        EQU (1<<6)
FLG_FLAGS_SF        EQU (1<<7)
FLG_FLAGS_TF        EQU (1<<8)
FLG_FLAGS_IF        EQU (1<<9)
FLG_FLAGS_DF        EQU (1<<10)
FLG_FLAGS_OF        EQU (1<<11)


;--------------------------------------------------------------------
; This macro must be the first thing to call on Interrupt Service Routine.
;
; CREATE_INTPACK_TO_SSBP
;   Parameters
;       Nothing
;   Returns:
;       SS:BP:  Points to INTPACK
;   Corrupts registers:
;       Nothing
;--------------------------------------------------------------------
%macro CREATE_INTPACK_TO_SSBP 0
    ePUSHA
    push    ds
    push    es
%ifdef USE_386
    push    fs
    push    gs
%endif
    mov     bp, sp
%endmacro

;--------------------------------------------------------------------
; This macro must be the last thing to call on Interrupt Service Routine.
;
; RESTORE_INTPACK_FROM_SSBP
;   Parameters
;       SS:BP:  Ptr to INTPACK
;   Returns:
;       All Registers will be loaded from INTPACK
;--------------------------------------------------------------------
%macro RESTORE_INTPACK_FROM_SSBP 0
%ifdef USE_386
    pop     gs
    pop     fs
%endif
    pop     es
    pop     ds
    ePOPA
    iret
%endmacro


;--------------------------------------------------------------------
; This macro must be the first thing to call on Interrupt Service Routine.
;
; CREATE_FRAME_INTPACK_TO_SSBP
;   Parameters
;       %1:     Number of extra bytes to reserve before INTPACK
;   Returns:
;       SS:BP:  Points to INTPACK
;   Corrupts registers:
;       Nothing
;--------------------------------------------------------------------
%macro CREATE_FRAME_INTPACK_TO_SSBP 1
    ePUSHA
    push    ds
    push    es
%ifdef USE_386
    push    fs
    push    gs
%endif
    sub     sp, BYTE %1
    mov     bp, sp
%endmacro

;--------------------------------------------------------------------
; This macro must be the last thing to call on Interrupt Service Routine.
;
; RESTORE_FRAME_INTPACK_FROM_SSBP
;   Parameters
;       %1:     Number of extra bytes in INTPACK
;       SS:BP:  Ptr to INTPACK
;   Returns:
;       All Registers will be loaded from INTPACK
;--------------------------------------------------------------------
%macro RESTORE_FRAME_INTPACK_FROM_SSBP 1
    add     sp, BYTE %1
%ifdef USE_386
    pop     gs
    pop     fs
%endif
    pop     es
    pop     ds
    ePOPA
    iret
%endmacro


;--------------------------------------------------------------------
; NORMALIZE_FAR_POINTER
;   Parameters:
;       %1:%2:      Far pointer to normalize
;       %3:         Scratch register
;       %4:         Scratch register
;   Returns:
;       %1:%2:      Normalized far pointer
;   Corrupts registers:
;       %3, %4
;--------------------------------------------------------------------
%macro NORMALIZE_FAR_POINTER 4
    mov     %4, %2              ; Copy offset to scratch reg
    and     %2, BYTE 0Fh        ; Clear offset bits 15...4
    eSHR_IM %4, 4               ; Divide offset by 16
    mov     %3, %1              ; Copy segment to scratch reg
    add     %3, %4              ; Add shifted offset to segment
    mov     %1, %3              ; Set normalized segment
%endmacro


;--------------------------------------------------------------------
; COPY_SSBP_TO_ESDI
; COPY_SSBP_TO_DSSI
; COPY_DSSI_TO_ESDI
; COPY_ESDI_to_DSSI
;   Parameters
;       Nothing
;   Returns:
;       Copies farm pointer to different segment/pointer register pair
;   Corrupts registers:
;       Nothing
;--------------------------------------------------------------------
%macro COPY_SSBP_TO_ESDI 0
    push    ss
    pop     es
    mov     di, bp
%endmacro

%macro COPY_SSBP_TO_DSSI 0
    push    ss
    pop     ds
    mov     si, bp
%endmacro

%macro COPY_DSSI_TO_ESDI 0
    push    ds
    pop     es
    mov     di, si
%endmacro

%macro COPY_ESDI_to_DSSI 0
    push    es
    pop     ds
    mov     si, di
%endmacro



%endif ; REGISTERS_INC