674 lines
14 KiB
C
674 lines
14 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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* Paradise driver (based on the Allegro Paradise code).
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*
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* By Francois Charton 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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/* chipset information */
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#define PVGA1 1
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#define WD90C 2
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int paradise_type = 0;
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/* driver function prototypes */
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void CirrusSetBank32();
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void CirrusSetBank32End();
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void CirrusSetBank(AF_DRIVER *af, long bank);
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void ParadiseSetBank32();
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void ParadiseSetBank32End();
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void ParadiseSetBank(AF_DRIVER *af, long bank);
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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, 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, long waitVRT);
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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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{
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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[] =
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{
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{ 640, 400, 8, 0x5E },
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{ 640, 480, 8, 0x5F },
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{ 800, 600, 8, 0x5C }
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};
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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, -1 };
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/* detect:
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* Detects the presence of a Paradise card.
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*/
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char *detect(unsigned long *vidmem)
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{
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char *name = NULL;
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RM_REGS r;
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int old, old2;
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old = read_vga_register(0x3CE, 0xF);
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write_vga_register(0x3CE, 0xF, old | 0x17); /* lock extended registers */
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if (test_vga_register(0x3CE, 0x9, 0x7F)) { /* not a Paradise card! */
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write_vga_register(0x3CE, 0xF, old);
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return NULL;
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}
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alter_vga_register(0x3CE, 0xF, 0x17, 5); /* unlock extended regs */
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if (!test_vga_register(0x3CE, 0x9, 0x7F)) { /* not a Paradise card! */
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write_vga_register(0x3CE, 0xF, old);
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return NULL;
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}
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old2 = read_vga_register(0x3D4, 0x29);
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alter_vga_register(0x3D4, 0x29, 0x8F, 0x85);
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if (!test_vga_register(0x3D4, 0x2B, 0xFF)) {
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paradise_type = PVGA1;
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name = "PVGA1";
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goto end;
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}
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write_vga_register(0x3C4, 0x06, 0x48);
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if (!test_vga_register(0x3C4, 0x7, 0xF0)) {
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paradise_type = PVGA1;
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name = "WD90C0x";
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goto end;
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}
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if (!test_vga_register(0x3C4, 0x10, 0xFF)) {
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paradise_type = PVGA1;
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name = "WD90C2x";
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write_vga_register(0x3D4, 0x34, 0xA6);
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if (read_vga_register(0x3D4, 0x32) & 0x20)
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write_vga_register(0x3D4, 0x34, 0);
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goto end;
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}
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paradise_type = WD90C;
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name = "WD90C1x or 24+";
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end:
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write_vga_register(0x3D4, 0x29, old2);
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write_vga_register(0x3CE, 0xF, old);
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r.x.ax = 0x007F;
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r.h.bh = 0x02;
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rm_int(0x10, &r);
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*vidmem = r.h.ch * 64;
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return name;
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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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{
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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)
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return 1;
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i = 0;
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while (af->OemVendorName[i])
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i++;
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af->OemVendorName[i++] = ',';
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af->OemVendorName[i++] = ' ';
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while (*name)
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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 = (afHaveMultiBuffer |
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afHaveVirtualScroll |
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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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if (paradise_type == PVGA1) {
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af->SetBank32 = CirrusSetBank32;
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af->SetBank32Len = (long)CirrusSetBank32End - (long)CirrusSetBank32;
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af->SetBank = CirrusSetBank;
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}
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else {
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af->SetBank32 = ParadiseSetBank32;
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af->SetBank32Len = (long)ParadiseSetBank32End - (long)ParadiseSetBank32;
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af->SetBank = ParadiseSetBank;
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}
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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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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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{
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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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{
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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:
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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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{
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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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{
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VIDEO_MODE *info;
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int i;
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if ((mode <= 0) || (mode > NUM_MODES))
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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++)
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((char *)modeInfo)[i] = 0;
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modeInfo->Attributes = (afHaveMultiBuffer |
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afHaveVirtualScroll |
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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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}
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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, long *bytesPerLine, int numBuffers, AF_CRTCInfo *crtc)
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{
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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)
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return -1;
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mode &= 0x3FF;
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if ((mode <= 0) || (mode > NUM_MODES))
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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 = 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)
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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, (width * (*bytesPerLine)) / (info->w*BYTES_PER_PIXEL(info->bpp)));
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}
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else
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*bytesPerLine = info->w*BYTES_PER_PIXEL(info->bpp);
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/* set up some hardware registers */
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if (paradise_type != PVGA1) {
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write_vga_register(0x3C4, 0x06, 0x48);
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alter_vga_register(0x3C4, 0x11, 0x80, 0x80);
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alter_vga_register(0x3CE, 0x0B, 0x80, 0x80);
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write_vga_register(0x3C4, 0x06, 0x00);
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}
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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)
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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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}
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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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{
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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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/* ??? */
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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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{
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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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{
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if (waitVRT >= 0) {
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long a = (x * BYTES_PER_PIXEL(af_bpp)) + ((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 {
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} while (inportb(0x3DA) & 1);
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}
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/* write high bits to Paradise register 3CE indx 0xD, bits 3-4 */
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alter_vga_register(0x3CE, 0x0D, 0x18, a>>15);
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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 {
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} while (!(inportb(0x3DA) & 8));
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}
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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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{
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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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{
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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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{
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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, long waitVRT)
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{
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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 {
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} while (!(inportb(0x3DA) & 8));
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}
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for (i=0; i<num; i++) {
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outportb(0x3C8, index+i);
|
|
outportb(0x3C9, pal[i].red/4);
|
|
outportb(0x3C9, pal[i].green/4);
|
|
outportb(0x3C9, pal[i].blue/4);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/* CirrusSetBank32:
|
|
* Relocatable bank switch function, called with a bank number in %edx.
|
|
*/
|
|
|
|
asm ("
|
|
|
|
.globl _CirrusSetBank32, _CirrusSetBank32End
|
|
|
|
.align 4
|
|
_CirrusSetBank32:
|
|
pushl %edx
|
|
pushl %eax
|
|
pushl %edx
|
|
|
|
movl $0x3CE, %edx /* 3CE index 0x9 */
|
|
movb $0x9, %al
|
|
outb %al, %dx
|
|
|
|
popl %eax /* write bank number */
|
|
shll $4, %eax
|
|
incl %edx
|
|
outb %al, %dx
|
|
|
|
popl %eax
|
|
popl %edx
|
|
ret
|
|
|
|
_CirrusSetBank32End:
|
|
|
|
");
|
|
|
|
|
|
|
|
/* CirrusSetBank:
|
|
* C-callable bank switch function. This version simply chains to the
|
|
* relocatable CirrusSetBank32() above.
|
|
*/
|
|
void CirrusSetBank(AF_DRIVER *af, long bank)
|
|
{
|
|
asm (
|
|
" call _CirrusSetBank32 "
|
|
:
|
|
: "d" (bank)
|
|
);
|
|
|
|
af_bank = bank;
|
|
}
|
|
|
|
|
|
|
|
/* ParadiseSetBank32:
|
|
* Relocatable bank switch function, called with a bank number in %edx.
|
|
*/
|
|
|
|
asm ("
|
|
|
|
.globl _ParadiseSetBank32, _ParadiseSetBank32End
|
|
|
|
.align 4
|
|
_ParadiseSetBank32:
|
|
pushl %eax
|
|
pushl %ecx
|
|
pushl %edx
|
|
|
|
movl %edx, %ecx
|
|
shll $4, %ecx
|
|
|
|
movl $0x3CE, %edx /* 3CE index 0x9 */
|
|
movb $0x9, %al
|
|
outb %al, %dx
|
|
|
|
movl %ecx, %eax /* set read bank number */
|
|
incl %edx
|
|
outb %al, %dx
|
|
|
|
decl %edx /* 3CE index 0xA */
|
|
movb $0xA, %al
|
|
outb %al, %dx
|
|
|
|
movl %ecx, %eax /* set write bank number */
|
|
incl %edx
|
|
outb %al, %dx
|
|
|
|
popl %edx
|
|
popl %ecx
|
|
popl %eax
|
|
ret
|
|
|
|
_ParadiseSetBank32End:
|
|
|
|
");
|
|
|
|
|
|
|
|
/* ParadiseSetBank:
|
|
* C-callable bank switch function. This version simply chains to the
|
|
* relocatable ParadiseSetBank32() above.
|
|
*/
|
|
void ParadiseSetBank(AF_DRIVER *af, long bank)
|
|
{
|
|
asm (
|
|
" call _ParadiseSetBank32 "
|
|
:
|
|
: "d" (bank)
|
|
);
|
|
|
|
af_bank = bank;
|
|
}
|
|
|
|
|
|
|