X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=blobdiff_plain;f=bios%2Fvgabios%2Fvbe.c;fp=bios%2Fvgabios%2Fvbe.c;h=8c06473e8a9266a360935ebd8da45e74deaef888;hp=0000000000000000000000000000000000000000;hb=d34450b1e6fe3c2e1295c268c1722c669ba8d545;hpb=1a24d4e8fb3918a42b124777db5b41940150023e diff --git a/bios/vgabios/vbe.c b/bios/vgabios/vbe.c new file mode 100644 index 0000000..8c06473 --- /dev/null +++ b/bios/vgabios/vbe.c @@ -0,0 +1,1068 @@ +// ============================================================================================ +// +// Copyright (C) 2002 Jeroen Janssen +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +// +// ============================================================================================ +// +// This VBE is part of the VGA Bios specific to the plex86/bochs Emulated VGA card. +// You can NOT drive any physical vga card with it. +// +// ============================================================================================ +// +// This VBE Bios is based on information taken from : +// - VESA BIOS EXTENSION (VBE) Core Functions Standard Version 3.0 located at www.vesa.org +// +// ============================================================================================ + + +// defines available +// enable LFB support +#define VBE_HAVE_LFB + +// disable VESA/VBE2 check in vbe info +//#define VBE2_NO_VESA_CHECK + +// dynamicly generate a mode_info list +#define DYN_LIST + + +#include "vbe.h" +#include "vbetables.h" + + +// The current OEM Software Revision of this VBE Bios +#define VBE_OEM_SOFTWARE_REV 0x0002; + +extern char vbebios_copyright; +extern char vbebios_vendor_name; +extern char vbebios_product_name; +extern char vbebios_product_revision; + +#ifndef DYN_LIST +extern Bit16u vbebios_mode_list; +#endif + +ASM_START +// FIXME: 'merge' these (c) etc strings with the vgabios.c strings? +_vbebios_copyright: +.ascii "Bochs/Plex86 VBE(C) 2003 http://savannah.nongnu.org/projects/vgabios/" +.byte 0x00 + +_vbebios_vendor_name: +.ascii "Bochs/Plex86 Developers" +.byte 0x00 + +_vbebios_product_name: +.ascii "Bochs/Plex86 VBE Adapter" +.byte 0x00 + +_vbebios_product_revision: +.ascii "$Id: vbe.c,v 1.1 2007/11/29 20:26:38 pdinda Exp $" +.byte 0x00 + +_vbebios_info_string: +.ascii "Bochs VBE Display Adapter enabled" +.byte 0x0a,0x0d +.byte 0x0a,0x0d +.byte 0x00 + +_no_vbebios_info_string: +.ascii "NO Bochs VBE Support available!" +.byte 0x0a,0x0d +.byte 0x0a,0x0d +.byte 0x00 + +#if defined(USE_BX_INFO) || defined(DEBUG) +msg_vbe_init: +.ascii "VBE Bios $Id: vbe.c,v 1.1 2007/11/29 20:26:38 pdinda Exp $" +.byte 0x0a,0x0d, 0x00 +#endif + +#ifndef DYN_LIST +// FIXME: for each new mode add a statement here +// at least until dynamic list creation is working +_vbebios_mode_list: + +.word VBE_VESA_MODE_640X400X8 +.word VBE_VESA_MODE_640X480X8 +.word VBE_VESA_MODE_800X600X4 +.word VBE_VESA_MODE_800X600X8 +.word VBE_VESA_MODE_1024X768X8 +.word VBE_VESA_MODE_640X480X1555 +.word VBE_VESA_MODE_640X480X565 +.word VBE_VESA_MODE_640X480X888 +.word VBE_VESA_MODE_800X600X1555 +.word VBE_VESA_MODE_800X600X565 +.word VBE_VESA_MODE_800X600X888 +.word VBE_VESA_MODE_1024X768X1555 +.word VBE_VESA_MODE_1024X768X565 +.word VBE_VESA_MODE_1024X768X888 +.word VBE_OWN_MODE_640X480X8888 +.word VBE_OWN_MODE_800X600X8888 +.word VBE_OWN_MODE_1024X768X8888 +.word VBE_OWN_MODE_320X200X8 +.word VBE_VESA_MODE_END_OF_LIST +#endif + +; DISPI ioport functions + +dispi_get_id: + push dx + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_ID + out dx, ax + mov dx, # VBE_DISPI_IOPORT_DATA + in ax, dx + pop dx + ret + +dispi_set_id: + push dx + push ax + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_ID + out dx, ax + pop ax + mov dx, # VBE_DISPI_IOPORT_DATA + out dx, ax + pop dx + ret +ASM_END + +static void dispi_set_xres(xres) + Bit16u xres; +{ +ASM_START + push bp + mov bp, sp + push ax + push dx + + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_XRES + out dx, ax + mov dx, # VBE_DISPI_IOPORT_DATA + mov ax, 4[bp] ; xres + out dx, ax + push ax + mov dx, #0x03d4 + mov ax, #0x0011 + out dx, ax + mov dx, #0x03d4 + pop ax + push ax + shr ax, #3 + dec ax + mov ah, al + mov al, #0x01 + out dx, ax + pop ax + call vga_set_virt_width + + pop dx + pop ax + pop bp +ASM_END +} + +static void dispi_set_yres(yres) + Bit16u yres; +{ + outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_YRES); + outw(VBE_DISPI_IOPORT_DATA,yres); +} + +static void dispi_set_bpp(bpp) + Bit16u bpp; +{ + outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_BPP); + outw(VBE_DISPI_IOPORT_DATA,bpp); +} + +ASM_START +; AL = bits per pixel / AH = bytes per pixel +dispi_get_bpp: + push dx + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_BPP + out dx, ax + mov dx, # VBE_DISPI_IOPORT_DATA + in ax, dx + mov ah, al + shr ah, 3 + test al, #0x07 + jz get_bpp_noinc + inc ah +get_bpp_noinc: + pop dx + ret + +_dispi_get_max_bpp: + push dx + push bx + call dispi_get_enable + mov bx, ax + or ax, # VBE_DISPI_GETCAPS + call _dispi_set_enable + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_BPP + out dx, ax + mov dx, # VBE_DISPI_IOPORT_DATA + in ax, dx + push ax + mov ax, bx + call _dispi_set_enable + pop ax + pop bx + pop dx + ret + +_dispi_set_enable: + push dx + push ax + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_ENABLE + out dx, ax + pop ax + mov dx, # VBE_DISPI_IOPORT_DATA + out dx, ax + pop dx + ret + +dispi_get_enable: + push dx + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_ENABLE + out dx, ax + mov dx, # VBE_DISPI_IOPORT_DATA + in ax, dx + pop dx + ret + +_dispi_set_bank: + push dx + push ax + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_BANK + out dx, ax + pop ax + mov dx, # VBE_DISPI_IOPORT_DATA + out dx, ax + pop dx + ret + +dispi_get_bank: + push dx + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_BANK + out dx, ax + mov dx, # VBE_DISPI_IOPORT_DATA + in ax, dx + pop dx + ret +ASM_END + +static void dispi_set_bank_farcall() +{ +ASM_START + cmp bx,#0x0100 + je dispi_set_bank_farcall_get + or bx,bx + jnz dispi_set_bank_farcall_error + push dx + mov ax,# VBE_DISPI_INDEX_BANK + mov dx,# VBE_DISPI_IOPORT_INDEX + out dx,ax + pop ax + mov dx,# VBE_DISPI_IOPORT_DATA + out dx,ax + retf +dispi_set_bank_farcall_get: + mov ax,# VBE_DISPI_INDEX_BANK + mov dx,# VBE_DISPI_IOPORT_INDEX + out dx,ax + mov dx,# VBE_DISPI_IOPORT_DATA + in ax,dx + mov dx,ax + retf +dispi_set_bank_farcall_error: + mov ax,#0x014F + retf +ASM_END +} + +ASM_START +dispi_set_x_offset: + push dx + push ax + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_X_OFFSET + out dx, ax + pop ax + mov dx, # VBE_DISPI_IOPORT_DATA + out dx, ax + pop dx + ret + +dispi_get_x_offset: + push dx + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_X_OFFSET + out dx, ax + mov dx, # VBE_DISPI_IOPORT_DATA + in ax, dx + pop dx + ret + +dispi_set_y_offset: + push dx + push ax + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_Y_OFFSET + out dx, ax + pop ax + mov dx, # VBE_DISPI_IOPORT_DATA + out dx, ax + pop dx + ret + +dispi_get_y_offset: + push dx + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_Y_OFFSET + out dx, ax + mov dx, # VBE_DISPI_IOPORT_DATA + in ax, dx + pop dx + ret + +vga_set_virt_width: + push ax + push bx + push dx + mov bx, ax + call dispi_get_bpp + cmp al, #0x04 + ja set_width_svga + shr bx, #2 +set_width_svga: + shr bx, #2 + mov dx, #0x03d4 + mov ah, bl + mov al, #0x13 + out dx, ax + pop dx + pop bx + pop ax + ret + +dispi_set_virt_width: + call vga_set_virt_width + push dx + push ax + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_VIRT_WIDTH + out dx, ax + pop ax + mov dx, # VBE_DISPI_IOPORT_DATA + out dx, ax + pop dx + ret + +dispi_get_virt_width: + push dx + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_VIRT_WIDTH + out dx, ax + mov dx, # VBE_DISPI_IOPORT_DATA + in ax, dx + pop dx + ret + +dispi_get_virt_height: + push dx + mov dx, # VBE_DISPI_IOPORT_INDEX + mov ax, # VBE_DISPI_INDEX_VIRT_HEIGHT + out dx, ax + mov dx, # VBE_DISPI_IOPORT_DATA + in ax, dx + pop dx + ret +ASM_END + + +// ModeInfo helper function +static ModeInfoListItem* mode_info_find_mode(mode, using_lfb) + Bit16u mode; Boolean using_lfb; +{ + ModeInfoListItem *cur_info=&mode_info_list; + + while (cur_info->mode != VBE_VESA_MODE_END_OF_LIST) + { + if (cur_info->mode == mode) + { + if (!using_lfb) + { + return cur_info; + } + else if (cur_info->info.ModeAttributes & VBE_MODE_ATTRIBUTE_LINEAR_FRAME_BUFFER_MODE) + { + return cur_info; + } + else + { + cur_info++; + } + } + else + { + cur_info++; + } + } + + return 0; +} + +ASM_START + +; Has VBE display - Returns true if VBE display detected + +_vbe_has_vbe_display: + push ds + push bx + mov ax, # BIOSMEM_SEG + mov ds, ax + mov bx, # BIOSMEM_VBE_FLAG + mov al, [bx] + and al, #0x01 + xor ah, ah + pop bx + pop ds + ret + +; VBE Init - Initialise the Vesa Bios Extension Code +; This function does a sanity check on the host side display code interface. + +vbe_init: + mov ax, # VBE_DISPI_ID0 + call dispi_set_id + call dispi_get_id + cmp ax, # VBE_DISPI_ID0 + jne no_vbe_interface + push ds + push bx + mov ax, # BIOSMEM_SEG + mov ds, ax + mov bx, # BIOSMEM_VBE_FLAG + mov al, #0x01 + mov [bx], al + pop bx + pop ds + mov ax, # VBE_DISPI_ID3 + call dispi_set_id +no_vbe_interface: +#if defined(USE_BX_INFO) || defined(DEBUG) + mov bx, #msg_vbe_init + push bx + call _printf + inc sp + inc sp +#endif + ret + +; VBE Display Info - Display information on screen about the VBE + +vbe_display_info: + call _vbe_has_vbe_display + test ax, ax + jz no_vbe_flag + mov ax, #0xc000 + mov ds, ax + mov si, #_vbebios_info_string + jmp _display_string +no_vbe_flag: + mov ax, #0xc000 + mov ds, ax + mov si, #_no_vbebios_info_string + jmp _display_string +ASM_END + +/** Function 00h - Return VBE Controller Information + * + * Input: + * AX = 4F00h + * ES:DI = Pointer to buffer in which to place VbeInfoBlock structure + * (VbeSignature should be VBE2 when VBE 2.0 information is desired and + * the info block is 512 bytes in size) + * Output: + * AX = VBE Return Status + * + */ +void vbe_biosfn_return_controller_information(AX, ES, DI) +Bit16u *AX;Bit16u ES;Bit16u DI; +{ + Bit16u ss=get_SS(); + VbeInfoBlock vbe_info_block; + Bit16u status; + Bit16u result; + Bit16u vbe2_info; + Bit16u cur_mode=0; + Bit16u cur_ptr=34; + ModeInfoListItem *cur_info=&mode_info_list; + + status = read_word(ss, AX); + +#ifdef DEBUG + printf("VBE vbe_biosfn_return_vbe_info ES%x DI%x AX%x\n",ES,DI,status); +#endif + + vbe2_info = 0; +#ifdef VBE2_NO_VESA_CHECK +#else + // get vbe_info_block into local variable + memcpyb(ss, &vbe_info_block, ES, DI, sizeof(vbe_info_block)); + + // check for VBE2 signature + if (((vbe_info_block.VbeSignature[0] == 'V') && + (vbe_info_block.VbeSignature[1] == 'B') && + (vbe_info_block.VbeSignature[2] == 'E') && + (vbe_info_block.VbeSignature[3] == '2')) || + + ((vbe_info_block.VbeSignature[0] == 'V') && + (vbe_info_block.VbeSignature[1] == 'E') && + (vbe_info_block.VbeSignature[2] == 'S') && + (vbe_info_block.VbeSignature[3] == 'A')) ) + { + vbe2_info = 1; +#ifdef DEBUG + printf("VBE correct VESA/VBE2 signature found\n"); +#endif + } +#endif + + // VBE Signature + vbe_info_block.VbeSignature[0] = 'V'; + vbe_info_block.VbeSignature[1] = 'E'; + vbe_info_block.VbeSignature[2] = 'S'; + vbe_info_block.VbeSignature[3] = 'A'; + + // VBE Version supported + vbe_info_block.VbeVersion = 0x0200; + + // OEM String + vbe_info_block.OemStringPtr_Seg = 0xc000; + vbe_info_block.OemStringPtr_Off = &vbebios_copyright; + + // Capabilities + vbe_info_block.Capabilities[0] = VBE_CAPABILITY_8BIT_DAC; + vbe_info_block.Capabilities[1] = 0; + vbe_info_block.Capabilities[2] = 0; + vbe_info_block.Capabilities[3] = 0; + +#ifdef DYN_LIST + // VBE Video Mode Pointer (dynamicly generated from the mode_info_list) + vbe_info_block.VideoModePtr_Seg= ES ; + vbe_info_block.VideoModePtr_Off= DI + 34; +#else + // VBE Video Mode Pointer (staticly in rom) + vbe_info_block.VideoModePtr_Seg = 0xc000; + vbe_info_block.VideoModePtr_Off = &vbebios_mode_list; +#endif + + // VBE Total Memory (in 64b blocks) + vbe_info_block.TotalMemory = VBE_TOTAL_VIDEO_MEMORY_DIV_64K; + + if (vbe2_info) + { + // OEM Stuff + vbe_info_block.OemSoftwareRev = VBE_OEM_SOFTWARE_REV; + vbe_info_block.OemVendorNamePtr_Seg = 0xc000; + vbe_info_block.OemVendorNamePtr_Off = &vbebios_vendor_name; + vbe_info_block.OemProductNamePtr_Seg = 0xc000; + vbe_info_block.OemProductNamePtr_Off = &vbebios_product_name; + vbe_info_block.OemProductRevPtr_Seg = 0xc000; + vbe_info_block.OemProductRevPtr_Off = &vbebios_product_revision; + + // copy updates in vbe_info_block back + memcpyb(ES, DI, ss, &vbe_info_block, sizeof(vbe_info_block)); + } + else + { + // copy updates in vbe_info_block back (VBE 1.x compatibility) + memcpyb(ES, DI, ss, &vbe_info_block, 256); + } + +#ifdef DYN_LIST + do + { + if (cur_info->info.BitsPerPixel <= dispi_get_max_bpp()) { +#ifdef DEBUG + printf("VBE found mode %x => %x\n", cur_info->mode,cur_mode); +#endif + write_word(ES, DI + cur_ptr, cur_info->mode); + cur_mode++; + cur_ptr+=2; + } + cur_info++; + } while (cur_info->mode != VBE_VESA_MODE_END_OF_LIST); + + // Add vesa mode list terminator + write_word(ES, DI + cur_ptr, cur_info->mode); +#endif + + result = 0x4f; + + write_word(ss, AX, result); +} + + +/** Function 01h - Return VBE Mode Information + * + * Input: + * AX = 4F01h + * CX = Mode Number + * ES:DI = Pointer to buffer in which to place ModeInfoBlock structure + * Output: + * AX = VBE Return Status + * + */ +void vbe_biosfn_return_mode_information(AX, CX, ES, DI) +Bit16u *AX;Bit16u CX; Bit16u ES;Bit16u DI; +{ + Bit16u result=0x0100; + Bit16u ss=get_SS(); + ModeInfoBlock info; + ModeInfoListItem *cur_info; + Boolean using_lfb; + +#ifdef DEBUG + printf("VBE vbe_biosfn_return_mode_information ES%x DI%x CX%x\n",ES,DI,CX); +#endif + + using_lfb=((CX & VBE_MODE_LINEAR_FRAME_BUFFER) == VBE_MODE_LINEAR_FRAME_BUFFER); + + CX = (CX & 0x1ff); + + cur_info = mode_info_find_mode(CX, using_lfb, &cur_info); + + if (cur_info != 0) + { +#ifdef DEBUG + printf("VBE found mode %x\n",CX); +#endif + memsetb(ss, &info, 0, sizeof(ModeInfoBlock)); + memcpyb(ss, &info, 0xc000, &(cur_info->info), sizeof(ModeInfoBlockCompact)); + if (info.WinAAttributes & VBE_WINDOW_ATTRIBUTE_RELOCATABLE) { + info.WinFuncPtr = 0xC0000000UL; + *(Bit16u *)&(info.WinFuncPtr) = (Bit16u)(dispi_set_bank_farcall); + } + + result = 0x4f; + } + else + { +#ifdef DEBUG + printf("VBE *NOT* found mode %x\n",CX); +#endif + result = 0x100; + } + + if (result == 0x4f) + { + // copy updates in mode_info_block back + memcpyb(ES, DI, ss, &info, sizeof(info)); + } + + write_word(ss, AX, result); +} + +/** Function 02h - Set VBE Mode + * + * Input: + * AX = 4F02h + * BX = Desired Mode to set + * ES:DI = Pointer to CRTCInfoBlock structure + * Output: + * AX = VBE Return Status + * + */ +void vbe_biosfn_set_mode(AX, BX, ES, DI) +Bit16u *AX;Bit16u BX; Bit16u ES;Bit16u DI; +{ + Bit16u ss = get_SS(); + Bit16u result; + ModeInfoListItem *cur_info; + Boolean using_lfb; + Bit8u no_clear; + Bit8u lfb_flag; + + using_lfb=((BX & VBE_MODE_LINEAR_FRAME_BUFFER) == VBE_MODE_LINEAR_FRAME_BUFFER); + lfb_flag=using_lfb?VBE_DISPI_LFB_ENABLED:0; + no_clear=((BX & VBE_MODE_PRESERVE_DISPLAY_MEMORY) == VBE_MODE_PRESERVE_DISPLAY_MEMORY)?VBE_DISPI_NOCLEARMEM:0; + + BX = (BX & 0x1ff); + + //result=read_word(ss,AX); + + // check for non vesa mode + if (BXinfo.XResolution, + cur_info->info.YResolution, + cur_info->info.BitsPerPixel); +#endif + + // first disable current mode (when switching between vesa modi) + dispi_set_enable(VBE_DISPI_DISABLED); + + if (cur_info->mode == VBE_VESA_MODE_800X600X4) + { + biosfn_set_video_mode(0x6a); + } + + dispi_set_bpp(cur_info->info.BitsPerPixel); + dispi_set_xres(cur_info->info.XResolution); + dispi_set_yres(cur_info->info.YResolution); + dispi_set_bank(0); + dispi_set_enable(VBE_DISPI_ENABLED | no_clear | lfb_flag); + + write_word(BIOSMEM_SEG,BIOSMEM_VBE_MODE,BX); + write_byte(BIOSMEM_SEG,BIOSMEM_VIDEO_CTL,(0x60 | no_clear)); + + result = 0x4f; + } + else + { +#ifdef DEBUG + printf("VBE *NOT* found mode %x\n" , BX); +#endif + result = 0x100; + + // FIXME: redirect non VBE modi to normal VGA bios operation + // (switch back to VGA mode + if (BX == 3) + result = 0x4f; + } + + write_word(ss, AX, result); +} + +/** Function 03h - Return Current VBE Mode + * + * Input: + * AX = 4F03h + * Output: + * AX = VBE Return Status + * BX = Current VBE Mode + * + */ +ASM_START +vbe_biosfn_return_current_mode: + push ds + mov ax, # BIOSMEM_SEG + mov ds, ax + call dispi_get_enable + and ax, # VBE_DISPI_ENABLED + jz no_vbe_mode + mov bx, # BIOSMEM_VBE_MODE + mov ax, [bx] + mov bx, ax + jnz vbe_03_ok +no_vbe_mode: + mov bx, # BIOSMEM_CURRENT_MODE + mov al, [bx] + mov bl, al + xor bh, bh +vbe_03_ok: + mov ax, #0x004f + pop ds + ret +ASM_END + + +/** Function 04h - Save/Restore State + * + * Input: + * AX = 4F04h + * DL = 00h Return Save/Restore State buffer size + * 01h Save State + * 02h Restore State + * CX = Requested states + * ES:BX = Pointer to buffer (if DL <> 00h) + * Output: + * AX = VBE Return Status + * BX = Number of 64-byte blocks to hold the state buffer (if DL=00h) + * + */ +void vbe_biosfn_save_restore_state(AX, DL, CX, ES, BX) +{ +} + + +/** Function 05h - Display Window Control + * + * Input: + * AX = 4F05h + * (16-bit) BH = 00h Set memory window + * = 01h Get memory window + * BL = Window number + * = 00h Window A + * = 01h Window B + * DX = Window number in video memory in window + * granularity units (Set Memory Window only) + * Note: + * If this function is called while in a linear frame buffer mode, + * this function must fail with completion code AH=03h + * + * Output: + * AX = VBE Return Status + * DX = Window number in window granularity units + * (Get Memory Window only) + */ +ASM_START +vbe_biosfn_display_window_control: + cmp bl, #0x00 + jne vbe_05_failed + cmp bh, #0x01 + je get_display_window + jb set_display_window + mov ax, #0x0100 + ret +set_display_window: + mov ax, dx + call _dispi_set_bank + call dispi_get_bank + cmp ax, dx + jne vbe_05_failed + mov ax, #0x004f + ret +get_display_window: + call dispi_get_bank + mov dx, ax + mov ax, #0x004f + ret +vbe_05_failed: + mov ax, #0x014f + ret +ASM_END + + +/** Function 06h - Set/Get Logical Scan Line Length + * + * Input: + * AX = 4F06h + * BL = 00h Set Scan Line Length in Pixels + * = 01h Get Scan Line Length + * = 02h Set Scan Line Length in Bytes + * = 03h Get Maximum Scan Line Length + * CX = If BL=00h Desired Width in Pixels + * If BL=02h Desired Width in Bytes + * (Ignored for Get Functions) + * + * Output: + * AX = VBE Return Status + * BX = Bytes Per Scan Line + * CX = Actual Pixels Per Scan Line + * (truncated to nearest complete pixel) + * DX = Maximum Number of Scan Lines + */ +ASM_START +vbe_biosfn_set_get_logical_scan_line_length: + mov ax, cx + cmp bl, #0x01 + je get_logical_scan_line_length + cmp bl, #0x02 + je set_logical_scan_line_bytes + jb set_logical_scan_line_pixels + mov ax, #0x0100 + ret +set_logical_scan_line_bytes: + push ax + call dispi_get_bpp + xor bh, bh + mov bl, ah + xor dx, dx + pop ax + div bx +set_logical_scan_line_pixels: + call dispi_set_virt_width +get_logical_scan_line_length: + call dispi_get_bpp + xor bh, bh + mov bl, ah + call dispi_get_virt_width + mov cx, ax + mul bx + mov bx, ax + call dispi_get_virt_height + mov dx, ax + mov ax, #0x004f + ret +ASM_END + + +/** Function 07h - Set/Get Display Start + * + * Input(16-bit): + * AX = 4F07h + * BH = 00h Reserved and must be 00h + * BL = 00h Set Display Start + * = 01h Get Display Start + * = 02h Schedule Display Start (Alternate) + * = 03h Schedule Stereoscopic Display Start + * = 04h Get Scheduled Display Start Status + * = 05h Enable Stereoscopic Mode + * = 06h Disable Stereoscopic Mode + * = 80h Set Display Start during Vertical Retrace + * = 82h Set Display Start during Vertical Retrace (Alternate) + * = 83h Set Stereoscopic Display Start during Vertical Retrace + * ECX = If BL=02h/82h Display Start Address in bytes + * If BL=03h/83h Left Image Start Address in bytes + * EDX = If BL=03h/83h Right Image Start Address in bytes + * CX = If BL=00h/80h First Displayed Pixel In Scan Line + * DX = If BL=00h/80h First Displayed Scan Line + * + * Output: + * AX = VBE Return Status + * BH = If BL=01h Reserved and will be 0 + * CX = If BL=01h First Displayed Pixel In Scan Line + * If BL=04h 0 if flip has not occurred, not 0 if it has + * DX = If BL=01h First Displayed Scan Line + * + * Input(32-bit): + * BH = 00h Reserved and must be 00h + * BL = 00h Set Display Start + * = 80h Set Display Start during Vertical Retrace + * CX = Bits 0-15 of display start address + * DX = Bits 16-31 of display start address + * ES = Selector for memory mapped registers + */ +ASM_START +vbe_biosfn_set_get_display_start: + cmp bl, #0x80 + je set_display_start + cmp bl, #0x01 + je get_display_start + jb set_display_start + mov ax, #0x0100 + ret +set_display_start: + mov ax, cx + call dispi_set_x_offset + mov ax, dx + call dispi_set_y_offset + mov ax, #0x004f + ret +get_display_start: + call dispi_get_x_offset + mov cx, ax + call dispi_get_y_offset + mov dx, ax + xor bh, bh + mov ax, #0x004f + ret +ASM_END + + +/** Function 08h - Set/Get Dac Palette Format + * + * Input: + * AX = 4F08h + * BL = 00h set DAC palette width + * = 01h get DAC palette width + * BH = If BL=00h: desired number of bits per primary color + * Output: + * AX = VBE Return Status + * BH = current number of bits per primary color (06h = standard VGA) + */ +ASM_START +vbe_biosfn_set_get_dac_palette_format: + cmp bl, #0x01 + je get_dac_palette_format + jb set_dac_palette_format + mov ax, #0x0100 + ret +set_dac_palette_format: + call dispi_get_enable + cmp bh, #0x06 + je set_normal_dac + cmp bh, #0x08 + jne vbe_08_unsupported + or ax, # VBE_DISPI_8BIT_DAC + jnz set_dac_mode +set_normal_dac: + and ax, #~ VBE_DISPI_8BIT_DAC +set_dac_mode: + call _dispi_set_enable +get_dac_palette_format: + mov bh, #0x06 + call dispi_get_enable + and ax, # VBE_DISPI_8BIT_DAC + jz vbe_08_ok + mov bh, #0x08 +vbe_08_ok: + mov ax, #0x004f + ret +vbe_08_unsupported: + mov ax, #0x014f + ret +ASM_END + + +/** Function 09h - Set/Get Palette Data + * + * Input: + * AX = 4F09h + * Output: + * AX = VBE Return Status + * + * FIXME: incomplete API description, Input & Output + */ +void vbe_biosfn_set_get_palette_data(AX) +{ +} + +/** Function 0Ah - Return VBE Protected Mode Interface + * + * Input: + * AX = 4F0Ah + * Output: + * AX = VBE Return Status + * + * FIXME: incomplete API description, Input & Output + */ +void vbe_biosfn_return_protected_mode_interface(AX) +{ +}