--- /dev/null
+// ============================================================================================
+//
+// 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 (BX<VBE_MODE_VESA_DEFINED)
+ {
+ Bit8u mode;
+
+ dispi_set_enable(VBE_DISPI_DISABLED);
+ // call the vgabios in order to set the video mode
+ // this allows for going back to textmode with a VBE call (some applications expect that to work)
+
+ mode=(BX & 0xff);
+ biosfn_set_video_mode(mode);
+ result = 0x4f;
+ }
+
+ cur_info = mode_info_find_mode(BX, using_lfb, &cur_info);
+
+ if (cur_info != 0)
+ {
+#ifdef DEBUG
+ printf("VBE found mode %x, setting:\n", BX);
+ printf("\txres%x yres%x bpp%x\n",
+ cur_info->info.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)
+{
+}
