482 lines
12 KiB
C
482 lines
12 KiB
C
/*
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* ______ ____ ______ _____ ______
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* | ____| | _ \| ____| / / _ \| ____|
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* | |__ _ __ ___ ___| |_) | |__ / / |_| | |__
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* | __| '__/ _ \/ _ \ _ <| __| / /| _ | __|
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* | | | | | __/ __/ |_) | |____ / / | | | | |
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* |_| |_| \___|\___|____/|______/_/ |_| |_|_|
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*
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*
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* Video-7 driver (based on the Allegro Video-7 code).
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*
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* By Peter Monks, Markus Oberhumer, and Shawn Hargreaves.
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*
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* See freebe.txt for copyright information.
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*/
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// #define NO_HWPTR
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#include <pc.h>
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#include "vbeaf.h"
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/* driver function prototypes */
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void SetBank32( );
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void SetBank32End( );
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int ExtStub( );
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long GetVideoModeInfo(AF_DRIVER *af, short mode, AF_MODE_INFO *modeInfo);
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long SetVideoMode(AF_DRIVER *af, short mode, long virtualX, long virtualY,
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long *bytesPerLine, int numBuffers, AF_CRTCInfo *crtc);
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void RestoreTextMode(AF_DRIVER *af);
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long GetClosestPixelClock(AF_DRIVER *af, short mode, unsigned long pixelClock);
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void SaveRestoreState(AF_DRIVER *af, int subfunc, void *saveBuf);
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void SetDisplayStart(AF_DRIVER *af, long x, long y, long waitVRT);
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void SetActiveBuffer(AF_DRIVER *af, long index);
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void SetVisibleBuffer(AF_DRIVER *af, long index, long waitVRT);
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int GetDisplayStartStatus(AF_DRIVER *af);
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void SetPaletteData(AF_DRIVER *af, AF_PALETTE *pal, long num, long index,
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long waitVRT);
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void SetBank(AF_DRIVER *af, long bank);
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/* list which ports we are going to access (only needed under Linux) */
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unsigned short ports_table[] = { 0xFFFF };
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/* internal driver state variables */
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int af_bpp;
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int af_width;
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int af_height;
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int af_visible_page;
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int af_active_page;
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int af_scroll_x;
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int af_scroll_y;
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int af_bank;
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/* FreeBE/AF extension allowing farptr access to video memory */
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FAF_HWPTR_DATA hwptr;
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/* list of available video modes */
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typedef struct VIDEO_MODE {
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int w, h;
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int bpp;
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int num;
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} VIDEO_MODE;
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VIDEO_MODE mode_list[] = { { 640, 400, 8, 0x66 },
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{ 640, 480, 8, 0x67 },
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{ 720, 540, 8, 0x68 },
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{ 800, 600, 8, 0x69 },
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{ 1024, 768, 8, 0x6A } };
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#define NUM_MODES (int)(sizeof(mode_list) / sizeof(VIDEO_MODE))
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short available_modes[NUM_MODES + 1] = { 1, 2, 3, 4, 5, -1 };
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/* detect:
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* Detects the presence of a Video-7 card.
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*/
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char *detect(unsigned long *vidmem) {
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RM_REGS r;
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unsigned v;
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int old;
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old = read_vga_register(0x3C4, 6);
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write_vga_register(0x3C4, 6, 0xEA); /* enable BIOS extensions */
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r.x.ax = 0x6F00; /* installation check */
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r.x.bx = 0x0000;
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rm_int(0x10, &r);
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if ((r.x.bx != 0x5637) && (r.x.bx != 0x4850)) {
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write_vga_register(0x3C4, 6, old);
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return NULL;
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}
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r.x.ax = 0x6F07; /* get configuration */
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rm_int(0x10, &r);
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if (r.h.al != 0x6F) {
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write_vga_register(0x3C4, 6, old);
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return NULL;
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}
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*vidmem = (r.h.ah & 0x7F) * 256;
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v = (read_vga_register(0x3C4, 0x8F) << 8) + read_vga_register(0x3C4, 0x8E);
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switch (v) {
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case 0x7140 ... 0x714F: return "V7 208A";
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case 0x7151: return "V7 208B";
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case 0x7152: return "V7 208CD";
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case 0x7760: return "V7 216BC";
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case 0x7763: return "V7 216D";
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case 0x7764: return "V7 216E";
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case 0x7765: return "V7 216F";
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default: return NULL;
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}
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}
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/* SetupDriver:
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* Fills in our driver header block.
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*/
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int SetupDriver(AF_DRIVER *af) {
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char *name;
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int i;
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name = detect(&af->TotalMemory);
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if (!name) return 1;
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i = 0;
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while (af->OemVendorName[i]) i++;
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af->OemVendorName[i++] = ',';
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af->OemVendorName[i++] = ' ';
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while (*name) af->OemVendorName[i++] = *(name++);
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af->OemVendorName[i] = 0;
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af->AvailableModes = available_modes;
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af->Attributes =
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(afHaveMultiBuffer | afHaveVirtualScroll | afHaveBankedBuffer);
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af->BankSize = 64;
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af->BankedBasePtr = 0xA0000;
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af->IOPortsTable = ports_table;
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af->SetBank32 = SetBank32;
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af->SetBank32Len = (long)SetBank32End - (long)SetBank32;
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af->SupplementalExt = ExtStub;
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af->GetVideoModeInfo = GetVideoModeInfo;
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af->SetVideoMode = SetVideoMode;
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af->RestoreTextMode = RestoreTextMode;
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af->GetClosestPixelClock = GetClosestPixelClock;
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af->SaveRestoreState = SaveRestoreState;
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af->SetDisplayStart = SetDisplayStart;
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af->SetActiveBuffer = SetActiveBuffer;
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af->SetVisibleBuffer = SetVisibleBuffer;
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af->GetDisplayStartStatus = GetDisplayStartStatus;
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af->SetPaletteData = SetPaletteData;
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af->SetBank = SetBank;
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return 0;
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}
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/* InitDriver:
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* The second thing to be called during the init process, after the
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* application has mapped all the memory and I/O resources we need.
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*/
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int InitDriver(AF_DRIVER *af) {
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hwptr_init(hwptr.IOMemMaps[0], af->IOMemMaps[0]);
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hwptr_init(hwptr.IOMemMaps[1], af->IOMemMaps[1]);
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hwptr_init(hwptr.IOMemMaps[2], af->IOMemMaps[2]);
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hwptr_init(hwptr.IOMemMaps[3], af->IOMemMaps[3]);
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hwptr_init(hwptr.BankedMem, af->BankedMem);
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hwptr_init(hwptr.LinearMem, af->LinearMem);
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return 0;
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}
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/* FreeBEX:
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* Returns an interface structure for the requested FreeBE/AF extension.
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*/
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void *FreeBEX(AF_DRIVER *af, unsigned long id) {
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switch (id) {
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#ifndef NO_HWPTR
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case FAFEXT_HWPTR:
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/* allow farptr access to video memory */
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return &hwptr;
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#endif
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default: return NULL;
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}
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}
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/* ExtStub:
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* Vendor-specific extension hook: we don't provide any.
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*/
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int ExtStub( ) {
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return 0;
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}
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/* GetVideoModeInfo:
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* Retrieves information about this video mode, returning zero on success
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* or -1 if the mode is invalid.
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*/
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long GetVideoModeInfo(AF_DRIVER *af, short mode, AF_MODE_INFO *modeInfo) {
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VIDEO_MODE *info;
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int i;
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if ((mode <= 0) || (mode > NUM_MODES)) return -1;
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info = &mode_list[mode - 1];
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for (i = 0; i < (int)sizeof(AF_MODE_INFO); i++) ((char *)modeInfo)[i] = 0;
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modeInfo->Attributes =
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(afHaveMultiBuffer | afHaveVirtualScroll | afHaveBankedBuffer);
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modeInfo->XResolution = info->w;
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modeInfo->YResolution = info->h;
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modeInfo->BitsPerPixel = info->bpp;
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modeInfo->MaxBuffers = (af->TotalMemory * 1024) /
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(info->w * info->h * BYTES_PER_PIXEL(info->bpp));
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if (info->w > 1024) {
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modeInfo->MaxBytesPerScanLine = 2048 * BYTES_PER_PIXEL(info->bpp);
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modeInfo->MaxScanLineWidth = 2048;
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} else {
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modeInfo->MaxBytesPerScanLine = 1024 * BYTES_PER_PIXEL(info->bpp);
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modeInfo->MaxScanLineWidth = 1024;
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}
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modeInfo->BytesPerScanLine = info->w * BYTES_PER_PIXEL(info->bpp);
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modeInfo->BnkMaxBuffers = modeInfo->MaxBuffers;
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modeInfo->MaxPixelClock = 135000000;
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return 0;
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}
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/* SetVideoMode:
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* Sets the specified video mode, returning zero on success.
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*/
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long SetVideoMode(AF_DRIVER *af, short mode, long virtualX, long virtualY,
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long *bytesPerLine, int numBuffers, AF_CRTCInfo *crtc) {
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long available_vram;
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long used_vram;
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int width;
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VIDEO_MODE *info;
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RM_REGS r;
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/* reject anything with hardware stereo, linear framebuffer, or noclear */
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if (mode & 0xC400) return -1;
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mode &= 0x3FF;
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if ((mode <= 0) || (mode > NUM_MODES)) return -1;
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info = &mode_list[mode - 1];
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/* call BIOS to set the mode */
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r.x.ax = 0x6F05;
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r.x.bx = info->num;
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rm_int(0x10, &r);
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/* adjust the virtual width for widescreen modes */
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if (virtualX > info->w) {
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if (virtualX > 1024) return -1;
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*bytesPerLine = ((virtualX * BYTES_PER_PIXEL(info->bpp)) + 15) & 0xFFF0;
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width = read_vga_register(0x3D4, 0x13);
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write_vga_register(0x3D4, 0x13,
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(width * (*bytesPerLine)) /
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(info->w * BYTES_PER_PIXEL(info->bpp)));
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} else
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*bytesPerLine = info->w * BYTES_PER_PIXEL(info->bpp);
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/* tweak some hardware registers */
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write_vga_register(0x3C4, 6, 0xEA); /* enable BIOS extensions */
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alter_vga_register(0x3C4, 0xE0, 0x80, 0); /* disable split banks */
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alter_vga_register(0x3C4, 0xF6, 0xC0, 0xC0); /* disable wrap-around */
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alter_vga_register(0x3C4, 0xFC, 0x07, 4); /* set compatibility control */
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/* store info about the current mode */
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af_bpp = info->bpp;
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af_width = *bytesPerLine;
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af_height = MAX(info->h, virtualY);
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af_visible_page = 0;
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af_active_page = 0;
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af_scroll_x = 0;
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af_scroll_y = 0;
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af_bank = -1;
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af->BufferEndX = af_width / BYTES_PER_PIXEL(af_bpp) - 1;
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af->BufferEndY = af_height - 1;
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af->OriginOffset = 0;
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used_vram = af_width * af_height * numBuffers;
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available_vram = af->TotalMemory * 1024;
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if (used_vram > available_vram) return -1;
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if (available_vram - used_vram >= af_width) {
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af->OffscreenOffset = used_vram;
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af->OffscreenStartY = af_height * numBuffers;
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af->OffscreenEndY = available_vram / af_width - 1;
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} else {
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af->OffscreenOffset = 0;
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af->OffscreenStartY = 0;
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af->OffscreenEndY = 0;
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}
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return 0;
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}
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/* RestoreTextMode:
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* Returns to text mode, shutting down the accelerator hardware.
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*/
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void RestoreTextMode(AF_DRIVER *af) {
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RM_REGS r;
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r.x.ax = 3;
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rm_int(0x10, &r);
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}
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/* GetClosestPixelClock:
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* I don't have a clue what this should return: it is used for the
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* refresh rate control.
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*/
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long GetClosestPixelClock(AF_DRIVER *af, short mode, unsigned long pixelClock) {
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/* ??? */
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return 135000000;
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}
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/* SaveRestoreState:
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* Stores the current driver status: not presently implemented.
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*/
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void SaveRestoreState(AF_DRIVER *af, int subfunc, void *saveBuf) {
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/* not implemented (not used by Allegro) */
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}
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/* SetDisplayStart:
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* Hardware scrolling function. The waitVRT value may be one of:
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*
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* -1 = don't set hardware, just store values for next page flip to use
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* 0 = set values and return immediately
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* 1 = set values and wait for retrace
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*/
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void SetDisplayStart(AF_DRIVER *af, long x, long y, long waitVRT) {
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if (waitVRT >= 0) {
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long a = (x * BYTES_PER_PIXEL(af_bpp)) +
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((y + af_visible_page * af_height) * af_width);
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asm volatile("cli");
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if (waitVRT) {
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do { } while (inportb(0x3DA) & 1); }
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/* write high bits to Video7 registers */
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alter_vga_register(0x3C4, 0xF6, 0x30, a >> (18 - 4));
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/* write to normal VGA address registers */
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write_vga_register(0x3D4, 0x0D, (a >> 2) & 0xFF);
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write_vga_register(0x3D4, 0x0C, (a >> 10) & 0xFF);
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asm volatile("sti");
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if (waitVRT) {
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do { } while (!(inportb(0x3DA) & 8)); }
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/* write low 2 bits to VGA horizontal pan register */
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write_vga_register(0x3C0, 0x33, a & 3);
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}
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af_scroll_x = x;
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af_scroll_y = y;
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}
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/* SetActiveBuffer:
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* Sets which buffer is being drawn onto, for use in multi buffering
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* systems (not used by Allegro).
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*/
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void SetActiveBuffer(AF_DRIVER *af, long index) {
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if (af->OffscreenOffset) {
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af->OffscreenStartY += af_active_page * af_height;
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af->OffscreenEndY += af_active_page * af_height;
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}
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af_active_page = index;
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af->OriginOffset = af_width * af_height * index;
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if (af->OffscreenOffset) {
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af->OffscreenStartY -= af_active_page * af_height;
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af->OffscreenEndY -= af_active_page * af_height;
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}
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}
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/* SetVisibleBuffer:
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* Sets which buffer is displayed on the screen, for use in multi buffering
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* systems (not used by Allegro).
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*/
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void SetVisibleBuffer(AF_DRIVER *af, long index, long waitVRT) {
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af_visible_page = index;
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SetDisplayStart(af, af_scroll_x, af_scroll_y, waitVRT);
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}
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/* GetDisplayStartStatus:
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* Status poll for triple buffering. Not possible on the majority of
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* present cards: this function is just a placeholder.
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*/
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int GetDisplayStartStatus(AF_DRIVER *af) {
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return 1;
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}
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/* SetPaletteData:
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* Palette setting routine.
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*/
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void SetPaletteData(AF_DRIVER *af, AF_PALETTE *pal, long num, long index,
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long waitVRT) {
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int i;
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if (waitVRT) {
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do {
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} while (inportb(0x3DA) & 8);
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do { } while (!(inportb(0x3DA) & 8)); }
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for (i = 0; i < num; i++) {
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outportb(0x3C8, index + i);
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outportb(0x3C9, pal[i].red / 4);
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outportb(0x3C9, pal[i].green / 4);
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outportb(0x3C9, pal[i].blue / 4);
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}
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}
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/* SetBank32:
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* Relocatable bank switch function, called with a bank number in %edx.
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*/
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asm ("
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.globl _SetBank32, _SetBank32End
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.align 4
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_SetBank32:
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pushl %edx
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pushl %eax
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movb %dl, %ah
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shlb $4, %ah /* bank number */
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movb $0xE8, %al
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movl $0x3C4, %edx
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outw %ax, %dx /* 3C4 index 0xE8 */
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popl %eax
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popl %edx
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ret
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_SetBank32End:
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");
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/* SetBank:
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* C-callable bank switch function. This version simply chains to the
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* relocatable SetBank32() above.
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*/
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void SetBank(AF_DRIVER *af, long bank)
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{
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asm(" call _SetBank32 " : : "d"(bank));
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af_bank = bank;
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}
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