diff options
Diffstat (limited to 'board/MAI/bios_emulator/scitech/src/pm/common/_dma.asm')
| -rw-r--r-- | board/MAI/bios_emulator/scitech/src/pm/common/_dma.asm | 246 |
1 files changed, 0 insertions, 246 deletions
diff --git a/board/MAI/bios_emulator/scitech/src/pm/common/_dma.asm b/board/MAI/bios_emulator/scitech/src/pm/common/_dma.asm deleted file mode 100644 index 2b6e1e8b56..0000000000 --- a/board/MAI/bios_emulator/scitech/src/pm/common/_dma.asm +++ /dev/null @@ -1,246 +0,0 @@ -;**************************************************************************** -;* -;* SciTech OS Portability Manager Library -;* -;* ======================================================================== -;* -;* The contents of this file are subject to the SciTech MGL Public -;* License Version 1.0 (the "License"); you may not use this file -;* except in compliance with the License. You may obtain a copy of -;* the License at http://www.scitechsoft.com/mgl-license.txt -;* -;* Software distributed under the License is distributed on an -;* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or -;* implied. See the License for the specific language governing -;* rights and limitations under the License. -;* -;* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc. -;* -;* The Initial Developer of the Original Code is SciTech Software, Inc. -;* All Rights Reserved. -;* -;* ======================================================================== -;* -;* Language: 80386 Assembler, TASM 4.0 or NASM -;* Environment: 16/32 bit Ring 0 device driver -;* -;* Description: Assembler support routines for ISA DMA controller. -;* -;**************************************************************************** - - IDEAL - -include "scitech.mac" ; Memory model macros - -header _dma ; Set up memory model - -begdataseg _dma ; Start of data segment - -cpublic _PM_DMADataStart - -; DMA register I/O addresses for channels 0-7 (except 4) - -DMAC_page db 087h,083h,081h,082h, -1,08Bh,089h,08Ah -DMAC_addr db 000h,002h,004h,006h, -1,0C4h,0C8h,0CCh -DMAC_cnt db 001h,003h,005h,007h, -1,0C6h,0CAh,0CEh -DMAC_mask db 00Ah,00Ah,00Ah,00Ah, -1,0D4h,0D4h,0D4h -DMAC_mode db 00Bh,00Bh,00Bh,00Bh, -1,0D6h,0D6h,0D6h -DMAC_FF db 00Ch,00Ch,00Ch,00Ch, -1,0D8h,0D8h,0D8h - -cpublic _PM_DMADataEnd - -enddataseg _dma - -begcodeseg _dma ; Start of code segment - -ifdef flatmodel - -cpublic _PM_DMACodeStart - -;---------------------------------------------------------------------------- -; void PM_DMACDisable(int channel); -;---------------------------------------------------------------------------- -; Masks DMA channel, inhibiting DMA transfers -;---------------------------------------------------------------------------- -cprocstart PM_DMACDisable - - ARG channel:UINT - - push ebp - mov ebp,esp - mov ecx,[channel] ; ECX indexes DMAC register tables - mov dh,0 ; DH = 0 for DMAC register port access - mov al,cl - and al,11b - or al,100b ; AL = (channel & 3) | "set mask bit" - mov dl,[DMAC_mask+ecx] - out dx,al - pop ebp - ret - -cprocend - -;---------------------------------------------------------------------------- -; void PM_DMACEnable(int channel); -;---------------------------------------------------------------------------- -; Unmasks DMA channel, enabling DMA transfers -;---------------------------------------------------------------------------- -cprocstart PM_DMACEnable - - ARG channel:UINT - - push ebp - mov ebp,esp - mov ecx,[channel] ; ECX indexes DMAC register tables - mov dh,0 ; DH = 0 for DMAC register port access - mov al,cl - and al,11b ; AL = (channel & 3), "set mask bit"=0 - mov dl,[DMAC_mask+ecx] - out dx,al - pop ebp - ret - -cprocend - -;---------------------------------------------------------------------------- -; void PM_DMACProgram(int channel,int mode,ulong bufferPhys,int count); -;---------------------------------------------------------------------------- -; Purpose: Program DMA controller to perform transfer from first 16MB -; based on previously selected mode and channel. DMA transfer may be enabled -; by subsequent call to PM_DMACEnable. -; -; Entry: channel - DMA channel in use (0-7) -; mode - Selected DMAMODE type for transfer -; buffer - 32-bit physical address of DMA buffer -; count - DMA byte count (1-65536 bytes) -;---------------------------------------------------------------------------- -cprocstart PM_DMACProgram - - ARG channel:UINT, mode:UINT, bufferPhys:ULONG, count:UINT - - enter_c - pushfd - cli ; Disable interrupts - -; Mask DMA channel to disable it - - mov ebx,[channel] ; EBX indexes DMAC register tables - mov dh,0 ; DH = 0 for DMAC register port access - mov al,bl - and al,11b - or al,100b ; AL = (channel & 3) | "set mask bit" - mov dl,[DMAC_mask+ebx] - out dx,al - -; Generate IOW to clear FF toggle state - - mov al,0 - mov dl,[DMAC_FF+ebx] - out dx,al - -; Compute buffer address to program - - mov eax,[bufferPhys] ; AX := DMA address offset - mov ecx,eax - shr ecx,16 ; CL := bufferPhys >> 16 (DMA page) - mov esi,[count] ; ESI = # of bytes to transfer - cmp ebx,4 ; 16-bit channel? - jb @@WriteDMAC ; No, program DMAC - shr eax,1 ; Yes, convert address and count - shr esi,1 ; to 16-bit, 128K/page format - -; Set the DMA address word (bits 0-15) - -@@WriteDMAC: - mov dl,[DMAC_addr+ebx] - out dx,al - mov al,ah - out dx,al - -; Set DMA transfer count - - mov eax,esi - dec eax ; ESI = # of bytes to transfer - 1 - mov dl,[DMAC_cnt+ebx] - out dx,al - mov al,ah - out dx,al - -; Set DMA page byte (bits 16-23) - - mov al,cl - mov dl,[DMAC_page+ebx] - out dx,al - -; Set the DMA channel mode - - mov al,bl - and al,11b - or al,[BYTE mode] ; EAX = (channel & 3) | mode - mov dl,[DMAC_mode+ebx] - out dx,al - - pop eax ; SMP safe interrupt state restore! - test eax,200h - jz @@1 - sti -@@1: leave_c - ret - -cprocend - -;---------------------------------------------------------------------------- -; ulong PMAPI PM_DMACPosition(int channel); -;---------------------------------------------------------------------------- -; Returns the current position in a dma transfer. Interrupts should be -; disabled before calling this function. -;---------------------------------------------------------------------------- -cprocstart PM_DMACPosition - - ARG channel:UINT - - enter_c - mov ecx,[channel] ; ECX indexes DMAC register tables - mov dh,0 ; DH = 0 for DMAC register port access - -; Generate IOW to clear FF toggle state - - mov al,0 - mov dl,[DMAC_FF+ebx] - out dx,al - xor eax,eax - xor ecx,ecx - -; Now read the current position for the channel - -@@ReadLoop: - mov dl,[DMAC_cnt+ebx] - out dx,al - in al,dx - mov cl,al - in al,dx - mov ch,al ; ECX := first count read - in al,dx - mov ah,al - in al,dx - xchg al,ah ; EAX := second count read - sub ecx,eax - cmp ecx,40h - jg @@ReadLoop - cmp ebx,4 ; 16-bit channel? - jb @@Exit ; No, we are done - shl eax,1 ; Yes, adjust to byte address - -@@Exit: leave_c - ret - -cprocend - - -cpublic _PM_DMACodeEnd - -endif - -endcodeseg _dma - - END ; End of module |
