| // ============================================================================================ |
| // |
| // 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 (depends upon bochs-vbe-lfb patch) |
| #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; |
| |
| #define VBEInfoData ((VbeInfoBlock *) 0) |
| |
| extern char vbebios_copyright; |
| extern char vbebios_vendor_name; |
| extern char vbebios_product_name; |
| extern char vbebios_product_revision; |
| |
| // FIXME: find out why we cannot use the dynamic list generation (due to a bug somewhere) |
| //#define DYN_LIST |
| |
| #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 Jeroen Janssen <japj@darius.demon.nl>" |
| .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 "$Id$" |
| .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 |
| |
| |
| #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 |
| |
| ASM_END |
| |
| // from rombios.c |
| #define PANIC_PORT 0x501 |
| |
| ASM_START |
| MACRO HALT |
| ;; the HALT macro is called with the line number of the HALT call. |
| ;; The line number is then sent to the PANIC_PORT, causing Bochs to |
| ;; print a BX_PANIC message. This will normally halt the simulation |
| ;; with a message such as "BIOS panic at rombios.c, line 4091". |
| ;; However, users can choose to make panics non-fatal and continue. |
| mov dx,#PANIC_PORT |
| mov ax,#?1 |
| out dx,ax |
| MEND |
| ASM_END |
| |
| // DISPI ioport functions |
| // FIXME: what if no VBE host side code? |
| static Bit16u dispi_get_id() |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ID); |
| return inw(VBE_DISPI_IOPORT_DATA); |
| } |
| |
| static void dispi_set_id(id) |
| Bit16u id; |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ID); |
| outw(VBE_DISPI_IOPORT_DATA,id); |
| } |
| |
| static void dispi_set_xres(xres) |
| Bit16u xres; |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_XRES); |
| outw(VBE_DISPI_IOPORT_DATA,xres); |
| } |
| |
| 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); |
| } |
| |
| static Bit16u dispi_get_bpp() |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_BPP); |
| return inw(VBE_DISPI_IOPORT_DATA); |
| } |
| |
| static Bit16u dispi_get_enable() |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ENABLE); |
| return inw(VBE_DISPI_IOPORT_DATA); |
| } |
| |
| void dispi_set_enable(enable) |
| Bit16u enable; |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ENABLE); |
| outw(VBE_DISPI_IOPORT_DATA,enable); |
| } |
| |
| static void dispi_set_bank(bank) |
| Bit16u bank; |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_BANK); |
| outw(VBE_DISPI_IOPORT_DATA,bank); |
| } |
| |
| static Bit16u dispi_get_bank() |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_BANK); |
| return inw(VBE_DISPI_IOPORT_DATA); |
| } |
| |
| 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 |
| } |
| |
| static void dispi_set_x_offset(offset) |
| Bit16u offset; |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_X_OFFSET); |
| outw(VBE_DISPI_IOPORT_DATA,offset); |
| } |
| |
| static Bit16u dispi_get_x_offset() |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_X_OFFSET); |
| return inw(VBE_DISPI_IOPORT_DATA); |
| } |
| |
| static void dispi_set_y_offset(offset) |
| Bit16u offset; |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_Y_OFFSET); |
| outw(VBE_DISPI_IOPORT_DATA,offset); |
| } |
| |
| static Bit16u dispi_get_y_offset() |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_Y_OFFSET); |
| return inw(VBE_DISPI_IOPORT_DATA); |
| } |
| |
| static void dispi_set_virt_width(width) |
| Bit16u width; |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_VIRT_WIDTH); |
| outw(VBE_DISPI_IOPORT_DATA,width); |
| } |
| |
| static Bit16u dispi_get_virt_width() |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_VIRT_WIDTH); |
| return inw(VBE_DISPI_IOPORT_DATA); |
| } |
| /* |
| static void dispi_set_virt_height(height) |
| Bit16u height; |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_VIRT_HEIGHT); |
| outw(VBE_DISPI_IOPORT_DATA,height); |
| } |
| */ |
| static Bit16u dispi_get_virt_height() |
| { |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_VIRT_HEIGHT); |
| return inw(VBE_DISPI_IOPORT_DATA); |
| } |
| |
| |
| // 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; |
| } |
| |
| /** Has VBE display - Returns true if VBE display detected |
| * |
| */ |
| Boolean vbe_has_vbe_display() |
| { |
| dispi_set_id(VBE_DISPI_ID2); |
| |
| return (dispi_get_id()==VBE_DISPI_ID2); |
| } |
| |
| /** VBE Init - Initialise the Vesa Bios Extension Code |
| * |
| * This function does a sanity check on the host side display code interface. |
| */ |
| void vbe_init() |
| { |
| Bit16u dispi_id; |
| |
| outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ID); |
| outw(VBE_DISPI_IOPORT_DATA,VBE_DISPI_ID0); |
| |
| dispi_id=inw(VBE_DISPI_IOPORT_DATA); |
| |
| if (dispi_id!=VBE_DISPI_ID0) |
| { |
| //FIXME this results in a 'rombios.c' line panic, but it's actually a 'vbe.c' panic |
| ASM_START |
| HALT(__LINE__) |
| ASM_END |
| } |
| //#ifdef DEBUG |
| printf("VBE Bios $Id$\n"); |
| //#endif |
| } |
| |
| /** VBE Display Info - Display information on screen about the VBE |
| */ |
| void vbe_display_info() |
| { |
| // Check for VBE display extension in Bochs |
| if (vbe_has_vbe_display()) |
| { |
| ASM_START |
| mov ax,#0xc000 |
| mov ds,ax |
| mov si,#_vbebios_info_string |
| call _display_string |
| ASM_END |
| } |
| else |
| { |
| ASM_START |
| mov ax,#0xc000 |
| mov ds,ax |
| mov si,#_no_vbebios_info_string |
| call _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; |
| #ifdef DYN_LIST |
| Bit16u *video_mode_list; |
| #endif |
| Bit16u cur_mode=0; |
| 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] = 0; |
| vbe_info_block.Capabilities[1] = 0; |
| vbe_info_block.Capabilities[2] = 0; |
| vbe_info_block.Capabilities[3] = 0; |
| |
| #ifdef DYN_LIST |
| // FIXME: This doesn't work correctly somehow? |
| // VBE Video Mode Pointer (dynamicly generated from the mode_info_list) |
| vbe_info_block.VideoModePtr_Seg= ES ;//0xc000; |
| vbe_info_block.VideoModePtr_Off= DI + 34;//&(VBEInfoData->Reserved);//&vbebios_mode_list; |
| #else |
| // VBE Video Mode Pointer (staticly in rom) |
| vbe_info_block.VideoModePtr_Seg = 0xc000; |
| vbe_info_block.VideoModePtr_Off = &vbebios_mode_list; |
| |
| #endif |
| |
| #ifdef DYN_LIST |
| |
| // video_mode_list=(Bit16u*)&(vbe_info_block.Reserved); |
| |
| do |
| { |
| #ifdef DEBUG |
| printf("VBE found mode %x => %x\n", cur_info->mode,cur_mode); |
| #endif |
| // *video_mode_list=cur_info->mode; |
| vbe_info_block.Reserved[cur_mode] = cur_info->mode; |
| |
| cur_info++; |
| //video_mode_list++; |
| cur_mode++; |
| } while (cur_info->mode != VBE_VESA_MODE_END_OF_LIST); |
| |
| // Add vesa mode list terminator |
| vbe_info_block.Reserved[cur_mode] = VBE_VESA_MODE_END_OF_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); |
| } |
| |
| 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_xres(cur_info->info.XResolution); |
| dispi_set_yres(cur_info->info.YResolution); |
| dispi_set_bpp(cur_info->info.BitsPerPixel); |
| 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 |
| * |
| */ |
| void vbe_biosfn_return_current_mode(AX, BX) |
| Bit16u *AX;Bit16u *BX; |
| { |
| Bit16u ss=get_SS(); |
| Bit16u mode; |
| |
| #ifdef DEBUG |
| printf("VBE vbe_biosfn_return_current_mode\n"); |
| #endif |
| |
| if(dispi_get_enable()) |
| { |
| mode=read_word(BIOSMEM_SEG,BIOSMEM_VBE_MODE); |
| } |
| else |
| { |
| mode=read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE); |
| } |
| write_word(ss, AX, 0x4f); |
| write_word(ss, BX, mode); |
| } |
| |
| |
| /** 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) |
| */ |
| void vbe_biosfn_display_window_control(AX,BX,DX) |
| Bit16u *AX;Bit16u BX;Bit16u *DX; |
| { |
| Bit16u ss = get_SS(); |
| Bit16u window = read_word(ss, DX); |
| Bit16u result = 0x014f; |
| |
| if (BX==0x0000) |
| { |
| dispi_set_bank(window); |
| result = 0x4f; |
| } |
| else if (BX==0x0100) |
| { |
| window = dispi_get_bank(); |
| write_word(ss, DX, result); |
| result = 0x4f; |
| } |
| write_word(ss, AX, result); |
| } |
| |
| |
| /** 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 |
| */ |
| void vbe_biosfn_set_get_logical_scan_line_length(AX,BX,CX,DX) |
| Bit16u *AX;Bit16u *BX;Bit16u *DX;Bit16u *DX; |
| { |
| Bit16u ss=get_SS(); |
| Bit16u result=0x100; |
| Bit16u width = read_word(ss, CX); |
| Bit16u cmd = read_word(ss, BX); |
| Bit8u bytespp = dispi_get_bpp()/8; |
| |
| // check bl |
| if ( ((cmd & 0xff) == 0x00) || ((cmd & 0xff) == 0x02) ) |
| { |
| // set scan line lenght in pixels(0x00) or bytes (0x02) |
| Bit16u new_width; |
| Bit16u new_height; |
| |
| if ( ((cmd & 0xff) == 0x02) && (bytespp > 1) ) |
| { |
| width/=bytespp; |
| } |
| dispi_set_virt_width(width); |
| new_width=dispi_get_virt_width(); |
| new_height=dispi_get_virt_height(); |
| |
| if (new_width!=width) |
| { |
| #ifdef DEBUG |
| printf("* VBE width adjusted\n"); |
| #endif |
| |
| // notify width adjusted |
| result=0x024f; |
| } |
| else |
| { |
| result=0x4f; |
| } |
| |
| write_word(ss,BX,new_width*bytespp); |
| write_word(ss,CX,new_width); |
| write_word(ss,DX,new_height); |
| } |
| |
| write_word(ss, AX, result); |
| } |
| |
| |
| /** 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 |
| */ |
| void vbe_biosfn_set_get_display_start(AX,BX,CX,DX) |
| Bit16u *AX;Bit16u BX;Bit16u CX;Bit16u DX; |
| { |
| Bit16u ss=get_SS(); |
| Bit16u result=0x100; |
| #ifdef DEBUG |
| // printf("VBE vbe_biosfn_set_get_display_start\n"); |
| #endif |
| |
| // check for set display start |
| if ((GET_BL()==0x00) || (GET_BL()==0x80)) |
| { |
| // 0x80 is during vertical retrace - is also used by sdd vbetest during multibuffering |
| #ifdef DEBUG |
| // printf("VBE vbe_biosfn_set_get_display_start CX%x DX%x\n",CX,DX); |
| #endif |
| |
| dispi_set_x_offset(CX); |
| dispi_set_y_offset(DX); |
| result = 0x4f; |
| } |
| |
| write_word(ss, AX, result); |
| } |
| |
| |
| /** Function 08h - Set/Get Dac Palette Format |
| * |
| * Input: |
| * AX = 4F08h |
| * Output: |
| * AX = VBE Return Status |
| * |
| * FIXME: incomplete API description, Input & Output |
| */ |
| void vbe_biosfn_set_get_dac_palette_format(AX) |
| { |
| } |
| |
| |
| /** 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) |
| { |
| } |
