vbe.c

xen 3.2.2 源码

        // 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)
{
}