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-/****************************************************************************
-*
-* The SuperVGA Kit - UniVBE Software Development Kit
-*
-* ========================================================================
-*
-* 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: ANSI C
-* Environment: IBM PC Real Mode and 16/32 bit Protected Mode.
-*
-* Description: Module to implement a C callable interface to the standard
-* VESA VBE routines. You should rip out this module and use it
-* directly in your own applications, or you can use the
-* high level SDK functions.
-*
-* MUST be compiled in the LARGE or FLAT models.
-*
-****************************************************************************/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include "vesavbe.h"
-#include "pmapi.h"
-#include "drvlib/os/os.h"
-
-/*---------------------------- Global Variables ---------------------------*/
-
-#define VBE_SUCCESS 0x004F
-#define MAX_LIN_PTRS 10
-
-static uint VESABuf_len = 1024;/* Length of the VESABuf buffer */
-static ibool haveRiva128; /* True if we have a Riva128 */
-static VBE_state defState = {0}; /* Default state buffer */
-static VBE_state *state = &defState; /* Pointer to current buffer */
-static int VBE_shared = 0;
-#ifndef REALMODE
-static char localBuf[512]; /* Global PM string translate buf */
-#define MAX_LOCAL_BUF &localBuf[511]
-#endif
-
-/*----------------------------- Implementation ----------------------------*/
-
-/* static function in WinDirect for passing 32-bit registers to BIOS */
-int PMAPI WD_int386(int intno, RMREGS *in, RMREGS *out);
-
-void VBEAPI VBE_init(void)
-/****************************************************************************
-*
-* Function: VBE_init
-*
-* Description: Initialises the VBE transfer buffer in real mode DC.memory.
-* This routine is called by the VESAVBE module every time
-* it needs to use the transfer buffer, so we simply allocate
-* it once and then return.
-*
-****************************************************************************/
-{
- if (!state->VESABuf_ptr) {
- /* Allocate a global buffer for communicating with the VESA VBE */
- if ((state->VESABuf_ptr = PM_getVESABuf(&VESABuf_len, &state->VESABuf_rseg, &state->VESABuf_roff)) == NULL)
- PM_fatalError("VESAVBE.C: Real mode memory allocation failed!");
- }
-}
-
-void * VBEAPI VBE_getRMBuf(uint *len,uint *rseg,uint *roff)
-/****************************************************************************
-*
-* Function: VBE_getRMBuf
-*
-* Description: This function returns the location and length of the real
-* mode memory buffer for calling real mode functions.
-*
-****************************************************************************/
-{
- *len = VESABuf_len;
- *rseg = state->VESABuf_rseg;
- *roff = state->VESABuf_roff;
- return state->VESABuf_ptr;
-}
-
-void VBEAPI VBE_setStateBuffer(VBE_state *s)
-/****************************************************************************
-*
-* Function: VBE_setStateBuffer
-*
-* Description: This functions sets the internal state buffer for the
-* VBE module to the passed in buffer. By default the internal
-* global buffer is used, but you must use separate buffers
-* for each device in a multi-controller environment.
-*
-****************************************************************************/
-{
- state = s;
-}
-
-void VBEAPI VBE_callESDI(RMREGS *regs, void *buffer, int size)
-/****************************************************************************
-*
-* Function: VBE_callESDI
-* Parameters: regs - Registers to load when calling VBE
-* buffer - Buffer to copy VBE info block to
-* size - Size of buffer to fill
-*
-* Description: Calls the VESA VBE and passes in a buffer for the VBE to
-* store information in, which is then copied into the users
-* buffer space. This works in protected mode as the buffer
-* passed to the VESA VBE is allocated in conventional
-* memory, and is then copied into the users memory block.
-*
-****************************************************************************/
-{
- RMSREGS sregs;
-
- if (!state->VESABuf_ptr)
- PM_fatalError("You *MUST* call VBE_init() before you can call the VESAVBE.C module!");
- sregs.es = (ushort)state->VESABuf_rseg;
- regs->x.di = (ushort)state->VESABuf_roff;
- memcpy(state->VESABuf_ptr, buffer, size);
- PM_int86x(0x10, regs, regs, &sregs);
- memcpy(buffer, state->VESABuf_ptr, size);
-}
-
-#ifndef REALMODE
-static char *VBE_copyStrToLocal(char *p,char *realPtr,char *max)
-/****************************************************************************
-*
-* Function: VBE_copyStrToLocal
-* Parameters: p - Flat model buffer to copy to
-* realPtr - Real mode pointer to copy
-* Returns: Pointer to the next byte after string
-*
-* Description: Copies the string from the real mode location pointed to
-* by 'realPtr' into the flat model buffer pointed to by
-* 'p'. We return a pointer to the next byte past the copied
-* string.
-*
-****************************************************************************/
-{
- uchar *v;
-
- v = PM_mapRealPointer((uint)((ulong)realPtr >> 16), (uint)((ulong)realPtr & 0xFFFF));
- while (*v != 0 && p < max)
- *p++ = *v++;
- *p++ = 0;
- return p;
-}
-
-static void VBE_copyShortToLocal(ushort *p,ushort *realPtr)
-/****************************************************************************
-*
-* Function: VBE_copyShortToLocal
-* Parameters: p - Flat model buffer to copy to
-* realPtr - Real mode pointer to copy
-*
-* Description: Copies the mode table from real mode memory to the flat
-* model buffer.
-*
-****************************************************************************/
-{
- ushort *v;
-
- v = PM_mapRealPointer((uint)((ulong)realPtr >> 16),(uint)((ulong)realPtr & 0xFFFF));
- while (*v != 0xFFFF)
- *p++ = *v++;
- *p = 0xFFFF;
-}
-#endif
-
-int VBEAPI VBE_detectEXT(VBE_vgaInfo *vgaInfo,ibool forceUniVBE)
-/****************************************************************************
-*
-* Function: VBE_detect
-* Parameters: vgaInfo - Place to store the VGA information block
-* Returns: VBE version number, or 0 if not detected.
-*
-* Description: Detects if a VESA VBE is out there and functioning
-* correctly. If we detect a VBE interface we return the
-* VGAInfoBlock returned by the VBE and the VBE version number.
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F00; /* Get SuperVGA information */
- if (forceUniVBE) {
- regs.x.bx = 0x1234;
- regs.x.cx = 0x4321;
- }
- else {
- regs.x.bx = 0;
- regs.x.cx = 0;
- }
- strncpy(vgaInfo->VESASignature,"VBE2",4);
- VBE_callESDI(&regs, vgaInfo, sizeof(*vgaInfo));
- if (regs.x.ax != VBE_SUCCESS)
- return 0;
- if (strncmp(vgaInfo->VESASignature,"VESA",4) != 0)
- return 0;
-
- /* Check for bogus BIOSes that return a VBE version number that is
- * not correct, and fix it up. We also check the OemVendorNamePtr for a
- * valid value, and if it is invalid then we also reset to VBE 1.2.
- */
- if (vgaInfo->VESAVersion >= 0x200 && vgaInfo->OemVendorNamePtr == 0)
- vgaInfo->VESAVersion = 0x102;
-#ifndef REALMODE
- /* Relocate all the indirect information (mode tables, OEM strings
- * etc) from the low 1Mb memory region into a static buffer in
- * our default data segment. We do this to insulate the application
- * from mapping the strings from real mode to protected mode.
- */
- {
- char *p,*p2;
- p2 = VBE_copyStrToLocal(localBuf,vgaInfo->OemStringPtr,MAX_LOCAL_BUF);
- vgaInfo->OemStringPtr = localBuf;
- if (vgaInfo->VESAVersion >= 0x200) {
- p = VBE_copyStrToLocal(p2,vgaInfo->OemVendorNamePtr,MAX_LOCAL_BUF);
- vgaInfo->OemVendorNamePtr = p2;
- p2 = VBE_copyStrToLocal(p,vgaInfo->OemProductNamePtr,MAX_LOCAL_BUF);
- vgaInfo->OemProductNamePtr = p;
- p = VBE_copyStrToLocal(p2,vgaInfo->OemProductRevPtr,MAX_LOCAL_BUF);
- vgaInfo->OemProductRevPtr = p2;
- VBE_copyShortToLocal((ushort*)p,vgaInfo->VideoModePtr);
- vgaInfo->VideoModePtr = (ushort*)p;
- }
- else {
- VBE_copyShortToLocal((ushort*)p2,vgaInfo->VideoModePtr);
- vgaInfo->VideoModePtr = (ushort*)p2;
- }
- }
-#endif
- state->VBEMemory = vgaInfo->TotalMemory * 64;
-
- /* Check for Riva128 based cards since they have broken triple buffering
- * and stereo support.
- */
- haveRiva128 = false;
- if (vgaInfo->VESAVersion >= 0x300 &&
- (strstr(vgaInfo->OemStringPtr,"NVidia") != NULL ||
- strstr(vgaInfo->OemStringPtr,"Riva") != NULL)) {
- haveRiva128 = true;
- }
-
- /* Check for Matrox G400 cards which claim to be VBE 3.0
- * compliant yet they don't implement the refresh rate control
- * functions.
- */
- if (vgaInfo->VESAVersion >= 0x300 && (strcmp(vgaInfo->OemProductNamePtr,"Matrox G400") == 0))
- vgaInfo->VESAVersion = 0x200;
- return (state->VBEVersion = vgaInfo->VESAVersion);
-}
-
-int VBEAPI VBE_detect(VBE_vgaInfo *vgaInfo)
-/****************************************************************************
-*
-* Function: VBE_detect
-* Parameters: vgaInfo - Place to store the VGA information block
-* Returns: VBE version number, or 0 if not detected.
-*
-* Description: Detects if a VESA VBE is out there and functioning
-* correctly. If we detect a VBE interface we return the
-* VGAInfoBlock returned by the VBE and the VBE version number.
-*
-****************************************************************************/
-{
- return VBE_detectEXT(vgaInfo,false);
-}
-
-ibool VBEAPI VBE_getModeInfo(int mode,VBE_modeInfo *modeInfo)
-/****************************************************************************
-*
-* Function: VBE_getModeInfo
-* Parameters: mode - VBE mode to get information for
-* modeInfo - Place to store VBE mode information
-* Returns: True on success, false if function failed.
-*
-* Description: Obtains information about a specific video mode from the
-* VBE. You should use this function to find the video mode
-* you wish to set, as the new VBE 2.0 mode numbers may be
-* completely arbitrary.
-*
-****************************************************************************/
-{
- RMREGS regs;
- int bits;
-
- regs.x.ax = 0x4F01; /* Get mode information */
- regs.x.cx = (ushort)mode;
- VBE_callESDI(&regs, modeInfo, sizeof(*modeInfo));
- if (regs.x.ax != VBE_SUCCESS)
- return false;
- if ((modeInfo->ModeAttributes & vbeMdAvailable) == 0)
- return false;
-
- /* Map out triple buffer and stereo flags for NVidia Riva128
- * chips.
- */
- if (haveRiva128) {
- modeInfo->ModeAttributes &= ~vbeMdTripleBuf;
- modeInfo->ModeAttributes &= ~vbeMdStereo;
- }
-
- /* Support old style RGB definitions for VBE 1.1 BIOSes */
- bits = modeInfo->BitsPerPixel;
- if (modeInfo->MemoryModel == vbeMemPK && bits > 8) {
- modeInfo->MemoryModel = vbeMemRGB;
- switch (bits) {
- case 15:
- modeInfo->RedMaskSize = 5;
- modeInfo->RedFieldPosition = 10;
- modeInfo->GreenMaskSize = 5;
- modeInfo->GreenFieldPosition = 5;
- modeInfo->BlueMaskSize = 5;
- modeInfo->BlueFieldPosition = 0;
- modeInfo->RsvdMaskSize = 1;
- modeInfo->RsvdFieldPosition = 15;
- break;
- case 16:
- modeInfo->RedMaskSize = 5;
- modeInfo->RedFieldPosition = 11;
- modeInfo->GreenMaskSize = 5;
- modeInfo->GreenFieldPosition = 5;
- modeInfo->BlueMaskSize = 5;
- modeInfo->BlueFieldPosition = 0;
- modeInfo->RsvdMaskSize = 0;
- modeInfo->RsvdFieldPosition = 0;
- break;
- case 24:
- modeInfo->RedMaskSize = 8;
- modeInfo->RedFieldPosition = 16;
- modeInfo->GreenMaskSize = 8;
- modeInfo->GreenFieldPosition = 8;
- modeInfo->BlueMaskSize = 8;
- modeInfo->BlueFieldPosition = 0;
- modeInfo->RsvdMaskSize = 0;
- modeInfo->RsvdFieldPosition = 0;
- break;
- }
- }
-
- /* Convert the 32k direct color modes of VBE 1.2+ BIOSes to
- * be recognised as 15 bits per pixel modes.
- */
- if (bits == 16 && modeInfo->RsvdMaskSize == 1)
- modeInfo->BitsPerPixel = 15;
-
- /* Fix up bogus BIOS'es that report incorrect reserved pixel masks
- * for 32K color modes. Quite a number of BIOS'es have this problem,
- * and this affects our OS/2 drivers in VBE fallback mode.
- */
- if (bits == 15 && (modeInfo->RsvdMaskSize != 1 || modeInfo->RsvdFieldPosition != 15)) {
- modeInfo->RsvdMaskSize = 1;
- modeInfo->RsvdFieldPosition = 15;
- }
- return true;
-}
-
-long VBEAPI VBE_getPageSize(VBE_modeInfo *mi)
-/****************************************************************************
-*
-* Function: VBE_getPageSize
-* Parameters: mi - Pointer to mode information block
-* Returns: Caculated page size in bytes rounded to correct boundary
-*
-* Description: Computes the page size in bytes for the specified mode
-* information block, rounded up to the appropriate boundary
-* (8k, 16k, 32k or 64k). Pages >= 64k in size are always
-* rounded to the nearest 64k boundary (so the start of a
-* page is always bank aligned).
-*
-****************************************************************************/
-{
- long size;
-
- size = (long)mi->BytesPerScanLine * (long)mi->YResolution;
- if (mi->BitsPerPixel == 4) {
- /* We have a 16 color video mode, so round up the page size to
- * 8k, 16k, 32k or 64k boundaries depending on how large it is.
- */
-
- size = (size + 0x1FFFL) & 0xFFFFE000L;
- if (size != 0x2000) {
- size = (size + 0x3FFFL) & 0xFFFFC000L;
- if (size != 0x4000) {
- size = (size + 0x7FFFL) & 0xFFFF8000L;
- if (size != 0x8000)
- size = (size + 0xFFFFL) & 0xFFFF0000L;
- }
- }
- }
- else size = (size + 0xFFFFL) & 0xFFFF0000L;
- return size;
-}
-
-ibool VBEAPI VBE_setVideoModeExt(int mode,VBE_CRTCInfo *crtc)
-/****************************************************************************
-*
-* Function: VBE_setVideoModeExt
-* Parameters: mode - SuperVGA video mode to set.
-* Returns: True if the mode was set, false if not.
-*
-* Description: Attempts to set the specified video mode. This version
-* includes support for the VBE/Core 3.0 refresh rate control
-* mechanism.
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- if (state->VBEVersion < 0x200 && mode < 0x100) {
- /* Some VBE implementations barf terribly if you try to set non-VBE
- * video modes with the VBE set mode call. VBE 2.0 implementations
- * must be able to handle this.
- */
- regs.h.al = (ushort)mode;
- regs.h.ah = 0;
- PM_int86(0x10,&regs,&regs);
- }
- else {
- if (state->VBEVersion < 0x300 && (mode & vbeRefreshCtrl))
- return false;
- regs.x.ax = 0x4F02;
- regs.x.bx = (ushort)mode;
- if ((mode & vbeRefreshCtrl) && crtc)
- VBE_callESDI(&regs, crtc, sizeof(*crtc));
- else
- PM_int86(0x10,&regs,&regs);
- if (regs.x.ax != VBE_SUCCESS)
- return false;
- }
- return true;
-}
-
-ibool VBEAPI VBE_setVideoMode(int mode)
-/****************************************************************************
-*
-* Function: VBE_setVideoMode
-* Parameters: mode - SuperVGA video mode to set.
-* Returns: True if the mode was set, false if not.
-*
-* Description: Attempts to set the specified video mode.
-*
-****************************************************************************/
-{
- return VBE_setVideoModeExt(mode,NULL);
-}
-
-int VBEAPI VBE_getVideoMode(void)
-/****************************************************************************
-*
-* Function: VBE_getVideoMode
-* Returns: Current video mode
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F03;
- PM_int86(0x10,&regs,&regs);
- if (regs.x.ax != VBE_SUCCESS)
- return -1;
- return regs.x.bx;
-}
-
-ibool VBEAPI VBE_setBank(int window,int bank)
-/****************************************************************************
-*
-* Function: VBE_setBank
-* Parameters: window - Window to set
-* bank - Bank number to set window to
-* Returns: True on success, false on failure.
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F05;
- regs.h.bh = 0;
- regs.h.bl = window;
- regs.x.dx = bank;
- PM_int86(0x10,&regs,&regs);
- return regs.x.ax == VBE_SUCCESS;
-}
-
-int VBEAPI VBE_getBank(int window)
-/****************************************************************************
-*
-* Function: VBE_setBank
-* Parameters: window - Window to read
-* Returns: Bank number for the window (-1 on failure)
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F05;
- regs.h.bh = 1;
- regs.h.bl = window;
- PM_int86(0x10,&regs,&regs);
- if (regs.x.ax != VBE_SUCCESS)
- return -1;
- return regs.x.dx;
-}
-
-ibool VBEAPI VBE_setPixelsPerLine(int pixelsPerLine,int *newBytes,
- int *newPixels,int *maxScanlines)
-/****************************************************************************
-*
-* Function: VBE_setPixelsPerLine
-* Parameters: pixelsPerLine - Pixels per scanline
-* newBytes - Storage for bytes per line value set
-* newPixels - Storage for pixels per line value set
-* maxScanLines - Storage for maximum number of scanlines
-* Returns: True on success, false on failure
-*
-* Description: Sets the scanline length for the video mode to the specified
-* number of pixels per scanline. If you need more granularity
-* in TrueColor modes, use the VBE_setBytesPerLine routine
-* (only valid for VBE 2.0).
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F06;
- regs.h.bl = 0;
- regs.x.cx = pixelsPerLine;
- PM_int86(0x10,&regs,&regs);
- *newBytes = regs.x.bx;
- *newPixels = regs.x.cx;
- *maxScanlines = regs.x.dx;
- return regs.x.ax == VBE_SUCCESS;
-}
-
-ibool VBEAPI VBE_setBytesPerLine(int bytesPerLine,int *newBytes,
- int *newPixels,int *maxScanlines)
-/****************************************************************************
-*
-* Function: VBE_setBytesPerLine
-* Parameters: pixelsPerLine - Pixels per scanline
-* newBytes - Storage for bytes per line value set
-* newPixels - Storage for pixels per line value set
-* maxScanLines - Storage for maximum number of scanlines
-* Returns: True on success, false on failure
-*
-* Description: Sets the scanline length for the video mode to the specified
-* number of bytes per scanline (valid for VBE 2.0 only).
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F06;
- regs.h.bl = 2;
- regs.x.cx = bytesPerLine;
- PM_int86(0x10,&regs,&regs);
- *newBytes = regs.x.bx;
- *newPixels = regs.x.cx;
- *maxScanlines = regs.x.dx;
- return regs.x.ax == VBE_SUCCESS;
-}
-
-ibool VBEAPI VBE_getScanlineLength(int *bytesPerLine,int *pixelsPerLine,
- int *maxScanlines)
-/****************************************************************************
-*
-* Function: VBE_getScanlineLength
-* Parameters: bytesPerLine - Storage for bytes per scanline
-* pixelsPerLine - Storage for pixels per scanline
-* maxScanLines - Storage for maximum number of scanlines
-* Returns: True on success, false on failure
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F06;
- regs.h.bl = 1;
- PM_int86(0x10,&regs,&regs);
- *bytesPerLine = regs.x.bx;
- *pixelsPerLine = regs.x.cx;
- *maxScanlines = regs.x.dx;
- return regs.x.ax == VBE_SUCCESS;
-}
-
-ibool VBEAPI VBE_getMaxScanlineLength(int *maxBytes,int *maxPixels)
-/****************************************************************************
-*
-* Function: VBE_getMaxScanlineLength
-* Parameters: maxBytes - Maximum scanline width in bytes
-* maxPixels - Maximum scanline width in pixels
-* Returns: True if successful, false if function failed
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F06;
- regs.h.bl = 3;
- PM_int86(0x10,&regs,&regs);
- *maxBytes = regs.x.bx;
- *maxPixels = regs.x.cx;
- return regs.x.ax == VBE_SUCCESS;
-}
-
-ibool VBEAPI VBE_setDisplayStart(int x,int y,ibool waitVRT)
-/****************************************************************************
-*
-* Function: VBE_setDisplayStart
-* Parameters: x,y - Position of the first pixel to display
-* waitVRT - True to wait for retrace, false if not
-* Returns: True if function was successful.
-*
-* Description: Sets the new starting display position to implement
-* hardware scrolling.
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F07;
- if (waitVRT)
- regs.x.bx = 0x80;
- else regs.x.bx = 0x00;
- regs.x.cx = x;
- regs.x.dx = y;
- PM_int86(0x10,&regs,&regs);
- return regs.x.ax == VBE_SUCCESS;
-}
-
-ibool VBEAPI VBE_getDisplayStart(int *x,int *y)
-/****************************************************************************
-*
-* Function: VBE_getDisplayStart
-* Parameters: x,y - Place to store starting address value
-* Returns: True if function was successful.
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F07;
- regs.x.bx = 0x01;
- PM_int86(0x10,&regs,&regs);
- *x = regs.x.cx;
- *y = regs.x.dx;
- return regs.x.ax == VBE_SUCCESS;
-}
-
-ibool VBEAPI VBE_setDisplayStartAlt(ulong startAddr,ibool waitVRT)
-/****************************************************************************
-*
-* Function: VBE_setDisplayStartAlt
-* Parameters: startAddr - 32-bit starting address in display memory
-* waitVRT - True to wait for vertical retrace, false if not
-* Returns: True if function was successful, false if not supported.
-*
-* Description: Sets the new starting display position to the specified
-* 32-bit display start address. Note that this function is
-* different the the version above, since it takes a 32-bit
-* byte offset in video memory as the starting address which
-* gives the programmer maximum control over the stat address.
-*
-* NOTE: Requires VBE/Core 3.0
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- if (state->VBEVersion >= 0x300) {
- regs.x.ax = 0x4F07;
- regs.x.bx = waitVRT ? 0x82 : 0x02;
- regs.e.ecx = startAddr;
- PM_int86(0x10,&regs,&regs);
- return regs.x.ax == VBE_SUCCESS;
- }
- return false;
-}
-
-int VBEAPI VBE_getDisplayStartStatus(void)
-/****************************************************************************
-*
-* Function: VBE_getDisplayStartStatus
-* Returns: 0 if last flip not occurred, 1 if already flipped
-* -1 if not supported
-*
-* Description: Returns the status of the previous display start request.
-* If this function is supported the programmer can implement
-* hardware triple buffering using this function.
-*
-* NOTE: Requires VBE/Core 3.0
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- if (state->VBEVersion >= 0x300) {
- regs.x.ax = 0x4F07;
- regs.x.bx = 0x0004;
- PM_int86(0x10,&regs,&regs);
- if (regs.x.ax == VBE_SUCCESS)
- return (regs.x.cx != 0);
- }
- return -1;
-}
-
-ibool VBEAPI VBE_enableStereoMode(void)
-/****************************************************************************
-*
-* Function: VBE_enableStereoMode
-* Returns: True if stereo mode enabled, false if not supported.
-*
-* Description: Puts the system into hardware stereo mode for LC shutter
-* glasses, where the display swaps between two display start
-* addresses every vertical retrace.
-*
-* NOTE: Requires VBE/Core 3.0
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- if (state->VBEVersion >= 0x300) {
- regs.x.ax = 0x4F07;
- regs.x.bx = 0x0005;
- PM_int86(0x10,&regs,&regs);
- return regs.x.ax == VBE_SUCCESS;
- }
- return false;
-}
-
-ibool VBEAPI VBE_disableStereoMode(void)
-/****************************************************************************
-*
-* Function: VBE_disableStereoMode
-* Returns: True if stereo mode disabled, false if not supported.
-*
-* Description: Puts the system back into normal, non-stereo display mode
-* after having stereo mode enabled.
-*
-* NOTE: Requires VBE/Core 3.0
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- if (state->VBEVersion >= 0x300) {
- regs.x.ax = 0x4F07;
- regs.x.bx = 0x0006;
- PM_int86(0x10,&regs,&regs);
- return regs.x.ax == VBE_SUCCESS;
- }
- return false;
-}
-
-ibool VBEAPI VBE_setStereoDisplayStart(ulong leftAddr,ulong rightAddr,
- ibool waitVRT)
-/****************************************************************************
-*
-* Function: VBE_setStereoDisplayStart
-* Parameters: leftAddr - 32-bit start address for left image
-* rightAddr - 32-bit start address for right image
-* waitVRT - True to wait for vertical retrace, false if not
-* Returns: True if function was successful, false if not supported.
-*
-* Description: Sets the new starting display position to the specified
-* 32-bit display start address. Note that this function is
-* different the the version above, since it takes a 32-bit
-* byte offset in video memory as the starting address which
-* gives the programmer maximum control over the stat address.
-*
-* NOTE: Requires VBE/Core 3.0
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- if (state->VBEVersion >= 0x300) {
- regs.x.ax = 0x4F07;
- regs.x.bx = waitVRT ? 0x83 : 0x03;
- regs.e.ecx = leftAddr;
- regs.e.edx = rightAddr;
- PM_int86(0x10,&regs,&regs);
- return regs.x.ax == VBE_SUCCESS;
- }
- return false;
-}
-
-ulong VBEAPI VBE_getClosestClock(ushort mode,ulong pixelClock)
-/****************************************************************************
-*
-* Function: VBE_getClosestClock
-* Parameters: mode - VBE mode to be used (include vbeLinearBuffer)
-* pixelClock - Desired pixel clock
-* Returns: Closest pixel clock to desired clock (-1 if not supported)
-*
-* Description: Calls the VBE/Core 3.0 interface to determine the closest
-* pixel clock to the requested value. The BIOS will always
-* search for a pixel clock that is no more than 1% below the
-* requested clock or somewhere higher than the clock. If the
-* clock is higher note that it may well be many Mhz higher
-* that requested and the application will have to check that
-* the returned value is suitable for it's needs. This function
-* returns the actual pixel clock that will be programmed by
-* the hardware.
-*
-* Note that if the pixel clock will be used with a linear
-* framebuffer mode, make sure you pass in the linear
-* framebuffer flag to this function.
-*
-* NOTE: Requires VBE/Core 3.0
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- if (state->VBEVersion >= 0x300) {
- regs.x.ax = 0x4F0B;
- regs.h.bl = 0x00;
- regs.e.ecx = pixelClock;
- regs.x.dx = mode;
- PM_int86(0x10,&regs,&regs);
- if (regs.x.ax == VBE_SUCCESS)
- return regs.e.ecx;
- }
- return -1;
-}
-
-ibool VBEAPI VBE_setDACWidth(int width)
-/****************************************************************************
-*
-* Function: VBE_setDACWidth
-* Parameters: width - Width to set the DAC to
-* Returns: True on success, false on failure
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F08;
- regs.h.bl = 0x00;
- regs.h.bh = width;
- PM_int86(0x10,&regs,&regs);
- return regs.x.ax == VBE_SUCCESS;
-}
-
-int VBEAPI VBE_getDACWidth(void)
-/****************************************************************************
-*
-* Function: VBE_getDACWidth
-* Returns: Current width of the palette DAC
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F08;
- regs.h.bl = 0x01;
- PM_int86(0x10,&regs,&regs);
- if (regs.x.ax != VBE_SUCCESS)
- return -1;
- return regs.h.bh;
-}
-
-ibool VBEAPI VBE_setPalette(int start,int num,VBE_palette *pal,ibool waitVRT)
-/****************************************************************************
-*
-* Function: VBE_setPalette
-* Parameters: start - Starting palette index to program
-* num - Number of palette indexes to program
-* pal - Palette buffer containing values
-* waitVRT - Wait for vertical retrace flag
-* Returns: True on success, false on failure
-*
-* Description: Sets a block of palette registers by calling the VBE 2.0
-* BIOS. This function will fail on VBE 1.2 implementations.
-*
-****************************************************************************/
-{
- RMREGS regs;
-
- regs.x.ax = 0x4F09;
- regs.h.bl = waitVRT ? 0x80 : 0x00;
- regs.x.cx = num;
- regs.x.dx = start;
- VBE_callESDI(&regs, pal, sizeof(VBE_palette) * num);
- return regs.x.ax == VBE_SUCCESS;
-}
-
-void * VBEAPI VBE_getBankedPointer(VBE_modeInfo *modeInfo)
-/****************************************************************************
-*
-* Function: VBE_getBankedPointer
-* Parameters: modeInfo - Mode info block for video mode
-* Returns: Selector to the linear framebuffer (0 on failure)
-*
-* Description: Returns a near pointer to the VGA framebuffer area.
-*
-****************************************************************************/
-{
- /* We just map the pointer every time, since the pointer will always
- * be in real mode memory, so we wont actually be mapping any real
- * memory.
- *
- * NOTE: We cannot currently map a near pointer to the banked frame
- * buffer for Watcom Win386, so we create a 16:16 far pointer to
- * the video memory. All the assembler code will render to the
- * video memory by loading the selector rather than using a
- * near pointer.
- */
- ulong seg = (ushort)modeInfo->WinASegment;
- if (seg != 0) {
- if (seg == 0xA000)
- return (void*)PM_getA0000Pointer();
- else
- return (void*)PM_mapPhysicalAddr(seg << 4,0xFFFF,true);
- }
- return NULL;
-}
-
-#ifndef REALMODE
-
-void * VBEAPI VBE_getLinearPointer(VBE_modeInfo *modeInfo)
-/****************************************************************************
-*
-* Function: VBE_getLinearPointer
-* Parameters: modeInfo - Mode info block for video mode
-* Returns: Selector to the linear framebuffer (0 on failure)
-*
-* Description: Returns a near pointer to the linear framebuffer for the video
-* mode.
-*
-****************************************************************************/
-{
- static ulong physPtr[MAX_LIN_PTRS] = {0};
- static void *linPtr[MAX_LIN_PTRS] = {0};
- static int numPtrs = 0;
- int i;
-
- /* Search for an already mapped pointer */
- for (i = 0; i < numPtrs; i++) {
- if (physPtr[i] == modeInfo->PhysBasePtr)
- return linPtr[i];
- }
- if (numPtrs < MAX_LIN_PTRS) {
- physPtr[numPtrs] = modeInfo->PhysBasePtr;
- linPtr[numPtrs] = PM_mapPhysicalAddr(modeInfo->PhysBasePtr,(state->VBEMemory * 1024L)-1,true);
- return linPtr[numPtrs++];
- }
- return NULL;
-}
-
-static void InitPMCode(void)
-/****************************************************************************
-*
-* Function: InitPMCode - 32 bit protected mode version
-*
-* Description: Finds the address of and relocates the protected mode
-* code block from the VBE 2.0 into a local memory block. The
-* memory block is allocated with malloc() and must be freed
-* with VBE_freePMCode() after graphics processing is complete.
-*
-* Note that this buffer _must_ be recopied after each mode set,
-* as the routines will change depending on the underlying
-* video mode.
-*
-****************************************************************************/
-{
- RMREGS regs;
- RMSREGS sregs;
- uchar *code;
- int pmLen;
-
- if (!state->pmInfo && state->VBEVersion >= 0x200) {
- regs.x.ax = 0x4F0A;
- regs.x.bx = 0;
- PM_int86x(0x10,&regs,&regs,&sregs);
- if (regs.x.ax != VBE_SUCCESS)
- return;
- if (VBE_shared)
- state->pmInfo = PM_mallocShared(regs.x.cx);
- else
- state->pmInfo = PM_malloc(regs.x.cx);
- if (state->pmInfo == NULL)
- return;
- state->pmInfo32 = state->pmInfo;
- pmLen = regs.x.cx;
-
- /* Relocate the block into our local data segment */
- code = PM_mapRealPointer(sregs.es,regs.x.di);
- memcpy(state->pmInfo,code,pmLen);
-
- /* Now do a sanity check on the information we recieve to ensure
- * that is is correct. Some BIOS return totally bogus information
- * in here (Matrox is one)! Under DOS this works OK, but under OS/2
- * we are screwed.
- */
- if (state->pmInfo->setWindow >= pmLen ||
- state->pmInfo->setDisplayStart >= pmLen ||
- state->pmInfo->setPalette >= pmLen ||
- state->pmInfo->IOPrivInfo >= pmLen) {
- if (VBE_shared)
- PM_freeShared(state->pmInfo);
- else
- PM_free(state->pmInfo);
- state->pmInfo32 = state->pmInfo = NULL;
- return;
- }
-
- /* Read the IO priveledge info and determine if we need to
- * pass a selector to MMIO registers to the bank switch code.
- * Since we no longer support selector allocation, we no longer
- * support this mechanism so we disable the protected mode
- * interface in this case.
- */
- if (state->pmInfo->IOPrivInfo && !state->MMIOSel) {
- ushort *p = (ushort*)((uchar*)state->pmInfo + state->pmInfo->IOPrivInfo);
- while (*p != 0xFFFF)
- p++;
- p++;
- if (*p != 0xFFFF)
- VBE_freePMCode();
- }
- }
-}
-
-void * VBEAPI VBE_getSetBank(void)
-/****************************************************************************
-*
-* Function: VBE_getSetBank
-* Returns: Pointer to the 32 VBE 2.0 bit bank switching routine.
-*
-****************************************************************************/
-{
- if (state->VBEVersion >= 0x200) {
- InitPMCode();
- if (state->pmInfo)
- return (uchar*)state->pmInfo + state->pmInfo->setWindow;
- }
- return NULL;
-}
-
-void * VBEAPI VBE_getSetDisplayStart(void)
-/****************************************************************************
-*
-* Function: VBE_getSetDisplayStart
-* Returns: Pointer to the 32 VBE 2.0 bit CRT start address routine.
-*
-****************************************************************************/
-{
- if (state->VBEVersion >= 0x200) {
- InitPMCode();
- if (state->pmInfo)
- return (uchar*)state->pmInfo + state->pmInfo->setDisplayStart;
- }
- return NULL;
-}
-
-void * VBEAPI VBE_getSetPalette(void)
-/****************************************************************************
-*
-* Function: VBE_getSetPalette
-* Returns: Pointer to the 32 VBE 2.0 bit palette programming routine.
-*
-****************************************************************************/
-{
- if (state->VBEVersion >= 0x200) {
- InitPMCode();
- if (state->pmInfo)
- return (uchar*)state->pmInfo + state->pmInfo->setPalette;
- }
- return NULL;
-}
-
-void VBEAPI VBE_freePMCode(void)
-/****************************************************************************
-*
-* Function: VBE_freePMCode
-*
-* Description: This routine frees the protected mode code blocks that
-* we copied from the VBE 2.0 interface. This routine must
-* be after you have finished graphics processing to free up
-* the memory occupied by the routines. This is necessary
-* because the PM info memory block must be re-copied after
-* every video mode set from the VBE 2.0 implementation.
-*
-****************************************************************************/
-{
- if (state->pmInfo) {
- if (VBE_shared)
- PM_freeShared(state->pmInfo);
- else
- PM_free(state->pmInfo);
- state->pmInfo = NULL;
- state->pmInfo32 = NULL;
- }
-}
-
-void VBEAPI VBE_sharePMCode(void)
-/****************************************************************************
-*
-* Function: VBE_sharePMCode
-*
-* Description: Enables internal sharing of the PM code buffer for OS/2.
-*
-****************************************************************************/
-{
- VBE_shared = true;
-}
-
-/* Set of code stubs used to build the final bank switch code */
-
-#define VBE20_adjustOffset 7
-
-static uchar VBE20A_bankFunc32_Start[] = {
- 0x53,0x51, /* push ebx,ecx */
- 0x8B,0xD0, /* mov edx,eax */
- 0x33,0xDB, /* xor ebx,ebx */
- 0xB1,0x00, /* mov cl,0 */
- 0xD2,0xE2, /* shl dl,cl */
- };
-
-static uchar VBE20_bankFunc32_End[] = {
- 0x59,0x5B, /* pop ecx,ebx */
- };
-
-static uchar bankFunc32[100];
-
-#define copy(p,b,a) memcpy(b,a,sizeof(a)); (p) = (b) + sizeof(a)
-
-ibool VBEAPI VBE_getBankFunc32(int *codeLen,void **bankFunc,int dualBanks,
- int bankAdjust)
-/****************************************************************************
-*
-* Function: VBE_getBankFunc32
-* Parameters: codeLen - Place to store length of code
-* bankFunc - Place to store pointer to bank switch code
-* dualBanks - True if dual banks are in effect
-* bankAdjust - Bank shift adjustment factor
-* Returns: True on success, false if not compatible.
-*
-* Description: Creates a local 32 bit bank switch function from the
-* VBE 2.0 bank switch code that is compatible with the
-* virtual flat framebuffer devices (does not have a return
-* instruction at the end and takes the bank number in EAX
-* not EDX). Note that this 32 bit code cannot include int 10h
-* instructions, so we can only do this if we have VBE 2.0
-* or later.
-*
-* Note that we need to know the length of the 32 bit
-* bank switch function, which the standard VBE 2.0 spec
-* does not provide. In order to support this we have
-* extended the VBE 2.0 state->pmInfo structure in UniVBE 5.2 in a
-* way to support this, and we hope that this will become
-* a VBE 2.0 ammendment.
-*
-* Note also that we cannot run the linear framebuffer
-* emulation code with bank switching routines that require
-* a selector to the memory mapped registers passed in ES.
-*
-****************************************************************************/
-{
- int len;
- uchar *code;
- uchar *p;
-
- InitPMCode();
- if (state->VBEVersion >= 0x200 && state->pmInfo32 && !state->MMIOSel) {
- code = (uchar*)state->pmInfo32 + state->pmInfo32->setWindow;
- if (state->pmInfo32->extensionSig == VBE20_EXT_SIG)
- len = state->pmInfo32->setWindowLen-1;
- else {
- /* We are running on a system without the UniVBE 5.2 extension.
- * We do as best we can by scanning through the code for the
- * ret function to determine the length. This is not foolproof,
- * but is the best we can do.
- */
- p = code;
- while (*p != 0xC3)
- p++;
- len = p - code;
- }
- if ((len + sizeof(VBE20A_bankFunc32_Start) + sizeof(VBE20_bankFunc32_End)) > sizeof(bankFunc32))
- PM_fatalError("32-bit bank switch function too long!");
- copy(p,bankFunc32,VBE20A_bankFunc32_Start);
- memcpy(p,code,len);
- p += len;
- copy(p,p,VBE20_bankFunc32_End);
- *codeLen = p - bankFunc32;
- bankFunc32[VBE20_adjustOffset] = (uchar)bankAdjust;
- *bankFunc = bankFunc32;
- return true;
- }
- return false;
-}
-
-#endif