;; ============================================================================================ ;; ;; Copyright (C) 2001,2002 the LGPL VGABios developers Team ;; ;; 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 VGA Bios is specific to the plex86/bochs Emulated VGA card. ;; You can NOT drive any physical vga card with it. ;; ;; ============================================================================================ ;; ; Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice ; other than GPL or LGPL is available it will apply instead, Oracle elects to use only ; the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where ; a choice of LGPL license versions is made available with the language indicating ; that LGPLv2 or any later version may be used, or where a choice of which version ; of the LGPL is applied is otherwise unspecified. include vgadefs.inc public vgabios_int10_handler VGAROM segment public 'CODE' ; Implemented in C extrn _int10_func:near extrn _vgabios_init_func:near ifdef VBE ; Implemented in separate assembly module extrn vbe_biosfn_return_current_mode:near extrn vbe_biosfn_display_window_control:near extrn vbe_biosfn_set_get_logical_scan_line_length:near extrn vbe_biosfn_set_get_display_start:near extrn vbe_biosfn_set_get_dac_palette_format:near extrn vbe_biosfn_set_get_palette_data:near extrn vbe_biosfn_return_protected_mode_interface:near endif ifdef VGA_DEBUG extrn _int10_debugmsg:near extrn _printf:near extrn _unimplemented:near extrn _unknown:near endif vgabios_start: db 055h, 0AAh ; ROM signature, required for expansion ROMs db 40h ; ROM module length in units of 512 bytes */ vgabios_entry_point: jmp _vgabios_init_func org 1Eh db 'IBM',0 ;; ;; int10 handled here ;; .286 vgabios_int10_handler: pushf ifdef VGA_DEBUG push es push ds pusha mov bx, 0C000h mov ds, bx call _int10_debugmsg popa pop ds pop es endif cmp ah, 0Fh jne int10_test_1A call biosfn_get_video_mode jmp int10_end int10_test_1A: cmp ah, 1Ah jne int10_test_0B call biosfn_group_1A jmp int10_end int10_test_0B: cmp ah, 0Bh jne int10_test_1103 call biosfn_group_0B jmp int10_end int10_test_1103: cmp ax, 1103h jne int10_test_12 call biosfn_set_text_block_specifier jmp int10_end int10_test_12: cmp ah, 12h jne int10_test_101B cmp bl, 10h jne int10_test_BL30 call biosfn_get_ega_info jmp int10_end int10_test_BL30: cmp bl, 30h jne int10_test_BL31 call biosfn_select_vert_res jmp int10_end int10_test_BL31: cmp bl, 31h jne int10_test_BL32 call biosfn_enable_default_palette_loading jmp int10_end int10_test_BL32: cmp bl, 32h jne int10_test_BL33 call biosfn_enable_video_addressing jmp int10_end int10_test_BL33: cmp bl, 33h jne int10_test_BL34 call biosfn_enable_grayscale_summing jmp int10_end int10_test_BL34: cmp bl, 34h jne int10_normal call biosfn_enable_cursor_emulation jmp int10_end int10_test_101B: cmp ax, 101Bh je int10_normal cmp ah, 10h ifndef VBE jne int10_normal else jne int10_test_4F endif call biosfn_group_10 jmp int10_end ifdef VBE int10_test_4F: cmp ah, 4Fh jne int10_normal cmp al, 3 jne int10_test_vbe_05 call vbe_biosfn_return_current_mode jmp int10_end int10_test_vbe_05: cmp al, 5 jne int10_test_vbe_06 call vbe_biosfn_display_window_control jmp int10_end int10_test_vbe_06: cmp al, 6 jne int10_test_vbe_07 call vbe_biosfn_set_get_logical_scan_line_length jmp int10_end int10_test_vbe_07: cmp al, 7 jne int10_test_vbe_08 call vbe_biosfn_set_get_display_start jmp int10_end int10_test_vbe_08: cmp al, 8 jne int10_test_vbe_09 call vbe_biosfn_set_get_dac_palette_format jmp int10_end int10_test_vbe_09: cmp al, 9 jne int10_test_vbe_0A call vbe_biosfn_set_get_palette_data jmp int10_end int10_test_vbe_0A: cmp al, 0Ah jne int10_normal call vbe_biosfn_return_protected_mode_interface jmp int10_end endif int10_normal: push es push ds pusha ;; We have to set ds to access the right data segment mov bx, 0C000h mov ds, bx call _int10_func popa pop ds pop es int10_end: popf iret ;;-------------------------------------------------------------------------------------------- biosfn_group_0B: cmp bh, 0 je biosfn_set_border_color cmp bh, 1 je biosfn_set_palette ifdef VGA_DEBUG call _unknown endif ret biosfn_set_border_color: push ax push bx push cx push dx push ds mov dx, BIOSMEM_SEG mov ds, dx mov dx, VGAREG_ACTL_RESET in al, dx cmp byte ptr ds:[BIOSMEM_CURRENT_MODE], 3 jbe set_border_done mov dx, VGAREG_ACTL_ADDRESS mov al, 00h out dx, al mov al, bl and al, 0Fh test al, 08h jz set_low_border add al, 08h set_low_border: out dx, al mov cl, 1 and bl, 10h set_intensity_loop: mov dx, VGAREG_ACTL_ADDRESS mov al, cl out dx, al mov dx, VGAREG_ACTL_READ_DATA in al, dx and al, 0EFh or al, bl mov dx, VGAREG_ACTL_ADDRESS out dx, al inc cl cmp cl, 4 jne set_intensity_loop set_border_done: mov al, 20h out dx, al ifdef VBOX mov dx, VGAREG_ACTL_RESET in al, dx endif ; VBOX pop ds pop dx pop cx pop bx pop ax ret biosfn_set_palette: push ax push bx push cx push dx mov dx, VGAREG_ACTL_RESET in al, dx mov cl, 01 and bl, 01 set_cga_palette_loop: mov dx, VGAREG_ACTL_ADDRESS mov al, cl out dx, al mov dx, VGAREG_ACTL_READ_DATA in al, dx and al, 0FEh or al, bl mov dx, VGAREG_ACTL_ADDRESS out dx, al inc cl cmp cl, 4 jne set_cga_palette_loop mov al, 20h out dx, al ifdef VBOX mov dx, VGAREG_ACTL_RESET in al, dx endif ; VBOX pop dx pop cx pop bx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_get_video_mode: push ds mov ax, BIOSMEM_SEG mov ds, ax push bx mov bx, BIOSMEM_CURRENT_PAGE mov al, [bx] pop bx mov bh, al push bx mov bx, BIOSMEM_VIDEO_CTL mov ah, [bx] and ah, 80h mov bx, BIOSMEM_CURRENT_MODE mov al, [bx] or al, ah mov bx, BIOSMEM_NB_COLS mov ah, [bx] pop bx pop ds ret ;-------------------------------------------------------------------------------------------- biosfn_group_10: cmp al, 0 jne int10_test_1001 jmp biosfn_set_single_palette_reg int10_test_1001: cmp al, 1 jne int10_test_1002 jmp biosfn_set_overscan_border_color int10_test_1002: cmp al, 2 jne int10_test_1003 jmp biosfn_set_all_palette_reg int10_test_1003: cmp al, 3 jne int10_test_1007 jmp biosfn_toggle_intensity int10_test_1007: cmp al, 7 jne int10_test_1008 jmp biosfn_get_single_palette_reg int10_test_1008: cmp al, 8 jne int10_test_1009 jmp biosfn_read_overscan_border_color int10_test_1009: cmp al, 9 jne int10_test_1010 jmp biosfn_get_all_palette_reg int10_test_1010: cmp al, 10h jne int10_test_1012 jmp biosfn_set_single_dac_reg int10_test_1012: cmp al, 12h jne int10_test_1013 jmp biosfn_set_all_dac_reg int10_test_1013: cmp al, 13h jne int10_test_1015 jmp biosfn_select_video_dac_color_page int10_test_1015: cmp al, 15h jne int10_test_1017 jmp biosfn_read_single_dac_reg int10_test_1017: cmp al, 17h jne int10_test_1018 jmp biosfn_read_all_dac_reg int10_test_1018: cmp al, 18h jne int10_test_1019 jmp biosfn_set_pel_mask int10_test_1019: cmp al, 19h jne int10_test_101A jmp biosfn_read_pel_mask int10_test_101A: cmp al, 1Ah jne int10_group_10_unknown jmp biosfn_read_video_dac_state int10_group_10_unknown: ifdef VGA_DEBUG call _unknown endif ret biosfn_set_single_palette_reg: cmp bl, 14h ja no_actl_reg1 push ax push dx mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, bl out dx, al mov al, bh out dx, al mov al, 20h out dx, al ifdef VBOX mov dx, VGAREG_ACTL_RESET in al, dx endif ; VBOX pop dx pop ax no_actl_reg1: ret ;-------------------------------------------------------------------------------------------- biosfn_set_overscan_border_color: push bx mov bl, 11h call biosfn_set_single_palette_reg pop bx ret ;-------------------------------------------------------------------------------------------- biosfn_set_all_palette_reg: push ax push bx push cx push dx mov bx, dx mov dx, VGAREG_ACTL_RESET in al, dx mov cl, 0 mov dx, VGAREG_ACTL_ADDRESS set_palette_loop: mov al, cl out dx, al mov al, es:[bx] out dx, al inc bx inc cl cmp cl, 10h jne set_palette_loop mov al, 11h out dx, al mov al, es:[bx] out dx, al mov al, 20h out dx, al ifdef VBOX mov dx, VGAREG_ACTL_RESET in al, dx endif ; VBOX pop dx pop cx pop bx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_toggle_intensity: push ax push bx push dx mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, 10h out dx, al mov dx, VGAREG_ACTL_READ_DATA in al, dx and al, 0F7h and bl, 01 shl bl, 3 or al, bl mov dx, VGAREG_ACTL_ADDRESS out dx, al mov al, 20h out dx, al ifdef VBOX mov dx, VGAREG_ACTL_RESET in al, dx endif ; VBOX pop dx pop bx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_get_single_palette_reg: cmp bl, 14h ja no_actl_reg2 push ax push dx mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, bl out dx, al mov dx, VGAREG_ACTL_READ_DATA in al, dx mov bh, al mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, 20h out dx, al ifdef VBOX mov dx, VGAREG_ACTL_RESET in al, dx endif ; VBOX pop dx pop ax no_actl_reg2: ret ;;-------------------------------------------------------------------------------------------- biosfn_read_overscan_border_color: push ax push bx mov bl, 11h call biosfn_get_single_palette_reg mov al, bh pop bx mov bh, al pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_get_all_palette_reg: push ax push bx push cx push dx mov bx, dx mov cl, 0 get_palette_loop: mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, cl out dx, al mov dx, VGAREG_ACTL_READ_DATA in al, dx mov es:[bx], al inc bx inc cl cmp cl, 10h jne get_palette_loop mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, 11h out dx, al mov dx, VGAREG_ACTL_READ_DATA in al, dx mov es:[bx], al mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, 20h out dx, al ifdef VBOX mov dx, VGAREG_ACTL_RESET in al, dx endif ; VBOX pop dx pop cx pop bx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_set_single_dac_reg: push ax push dx mov dx, VGAREG_DAC_WRITE_ADDRESS mov al, bl out dx, al mov dx, VGAREG_DAC_DATA pop ax push ax mov al, ah out dx, al mov al, ch out dx, al mov al, cl out dx, al pop dx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_set_all_dac_reg: push ax push bx push cx push dx mov dx, VGAREG_DAC_WRITE_ADDRESS mov al, bl out dx, al pop dx push dx mov bx, dx mov dx, VGAREG_DAC_DATA set_dac_loop: mov al, es:[bx] out dx, al inc bx mov al, es:[bx] out dx, al inc bx mov al, es:[bx] out dx, al inc bx dec cx jnz set_dac_loop pop dx pop cx pop bx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_select_video_dac_color_page: push ax push bx push dx mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, 10h out dx, al mov dx, VGAREG_ACTL_READ_DATA in al, dx and bl, 01 jnz set_dac_page and al, 07Fh shl bh, 7 or al, bh mov dx, VGAREG_ACTL_ADDRESS out dx, al jmp set_actl_normal set_dac_page: push ax mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, 14h out dx, al pop ax and al, 80h jnz set_dac_16_page shl bh, 2 set_dac_16_page: and bh, 0Fh mov al, bh out dx, al set_actl_normal: mov al, 20h out dx, al ifdef VBOX mov dx, VGAREG_ACTL_RESET in al, dx endif ; VBOX pop dx pop bx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_read_single_dac_reg: push ax push dx mov dx, VGAREG_DAC_READ_ADDRESS mov al, bl out dx, al pop ax mov ah, al mov dx, VGAREG_DAC_DATA in al, dx xchg al, ah push ax in al, dx mov ch, al in al, dx mov cl, al pop dx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_read_all_dac_reg: push ax push bx push cx push dx mov dx, VGAREG_DAC_READ_ADDRESS mov al, bl out dx, al pop dx push dx mov bx, dx mov dx, VGAREG_DAC_DATA read_dac_loop: in al, dx mov es:[bx], al inc bx in al, dx mov es:[bx], al inc bx in al, dx mov es:[bx], al inc bx dec cx jnz read_dac_loop pop dx pop cx pop bx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_set_pel_mask: push ax push dx mov dx, VGAREG_PEL_MASK mov al, bl out dx, al pop dx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_read_pel_mask: push ax push dx mov dx, VGAREG_PEL_MASK in al, dx mov bl, al pop dx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_read_video_dac_state: push ax push dx mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, 10h out dx, al mov dx, VGAREG_ACTL_READ_DATA in al, dx mov bl, al shr bl, 7 mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, 14h out dx, al mov dx, VGAREG_ACTL_READ_DATA in al, dx mov bh, al and bh, 0Fh test bl, 01 jnz get_dac_16_page shr bh, 2 get_dac_16_page: mov dx, VGAREG_ACTL_RESET in al, dx mov dx, VGAREG_ACTL_ADDRESS mov al, 20h out dx, al ifdef VBOX mov dx, VGAREG_ACTL_RESET in al, dx endif ; VBOX pop dx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_set_text_block_specifier: push ax push dx mov dx, VGAREG_SEQU_ADDRESS mov ah, bl mov al, 03 out dx, ax pop dx pop ax ret ;;-------------------------------------------------------------------------------------------- biosfn_get_ega_info: push ds push ax mov ax, BIOSMEM_SEG mov ds, ax xor ch, ch mov bx, BIOSMEM_SWITCHES mov cl, [bx] and cl, 0Fh mov bx, BIOSMEM_CRTC_ADDRESS mov ax, [bx] mov bx, 0003h cmp ax, VGAREG_MDA_CRTC_ADDRESS jne mode_ega_color mov bh, 01 mode_ega_color: pop ax pop ds ret ;;-------------------------------------------------------------------------------------------- biosfn_select_vert_res: ; res : 00 200 lines, 01 350 lines, 02 400 lines push ds push bx push dx mov dl, al mov ax, BIOSMEM_SEG mov ds, ax mov bx, BIOSMEM_MODESET_CTL mov al, [bx] mov bx, BIOSMEM_SWITCHES mov ah, [bx] cmp dl, 1 je vert_res_350 jb vert_res_200 cmp dl, 2 je vert_res_400 ifdef VGA_DEBUG mov al, dl xor ah, ah push ax mov bx, msg_vert_res push bx call _printf add sp, 4 endif jmp set_retcode vert_res_400: ; reset modeset ctl bit 7 and set bit 4 ; set switches bit 3-0 to 09 and al, 07Fh or al, 010h and ah, 0F0h or ah, 009h jnz set_vert_res vert_res_350: ; reset modeset ctl bit 7 and bit 4 ; set switches bit 3-0 to 09 and al, 06Fh and ah, 0F0h or ah, 009h jnz set_vert_res vert_res_200: ; set modeset ctl bit 7 and reset bit 4 ; set switches bit 3-0 to 08 and al, 0EFh or al, 080h and ah, 0F0h or ah, 008h set_vert_res: mov bx, BIOSMEM_MODESET_CTL mov [bx], al mov bx, BIOSMEM_SWITCHES mov [bx], ah set_retcode: mov ax, 1212h pop dx pop bx pop ds ret ifdef VGA_DEBUG msg_vert_res: db "Select vert res (%02x) was discarded", 13, 10, 0 endif biosfn_enable_default_palette_loading: push ds push bx push dx mov dl, al and dl, 01 shl dl, 3 mov ax, BIOSMEM_SEG mov ds, ax mov bx, BIOSMEM_MODESET_CTL mov al, [bx] and al, 0F7h or al, dl mov [bx], al mov ax, 1212h pop dx pop bx pop ds ret biosfn_enable_video_addressing: push bx push dx mov bl, al and bl, 01 xor bl, 01 shl bl, 1 mov dx, VGAREG_READ_MISC_OUTPUT in al, dx and al, 0FDh or al, bl mov dx, VGAREG_WRITE_MISC_OUTPUT out dx, al mov ax, 1212h pop dx pop bx ret biosfn_enable_grayscale_summing: push ds push bx push dx mov dl, al and dl, 01h xor dl, 01h shl dl, 1 mov ax, BIOSMEM_SEG mov ds, ax mov bx, BIOSMEM_MODESET_CTL mov al, [bx] and al, 0FDh or al, dl mov [bx], al mov ax, 1212h pop dx pop bx pop ds ret biosfn_enable_cursor_emulation: push ds push bx push dx mov dl, al and dl, 01 xor dl, 01 mov ax, BIOSMEM_SEG mov ds, ax mov bx, BIOSMEM_MODESET_CTL mov al, [bx] and al, 0FEh or al, dl mov [bx], al mov ax, 1212h pop dx pop bx pop ds ret ;;-------------------------------------------------------------------------------------------- biosfn_group_1A: cmp al, 0 je biosfn_read_display_code cmp al, 1 je biosfn_set_display_code ifdef VGA_DEBUG call _unknown endif ret biosfn_read_display_code: push ds push ax mov ax, BIOSMEM_SEG mov ds, ax mov bx, BIOSMEM_DCC_INDEX mov al, [bx] mov bl, al xor bh, bh pop ax mov al, ah pop ds ret biosfn_set_display_code: push ds push ax push bx mov ax, BIOSMEM_SEG mov ds, ax mov ax, bx mov bx, BIOSMEM_DCC_INDEX mov [bx], al ifdef VGA_DEBUG mov al, ah xor ah, ah push ax mov bx, msg_alt_dcc push bx call _printf add sp, 4 endif pop bx pop ax mov al, ah pop ds ret ifdef VGA_DEBUG msg_alt_dcc: db "Alternate Display code (%02x) was discarded", 13, 10, 0 endif VGAROM ends end