196 lines
6.2 KiB
C++
196 lines
6.2 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: vga.h,v 1.6 2001-10-03 13:10:38 bdenney Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#define CGA_TEXT_ADDR(row, column) (0x18000 + ((row)*80 + (column))*2)
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#define X_TILESIZE 16
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#define Y_TILESIZE 16
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#define BX_NUM_X_TILES (640/X_TILESIZE)
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#define BX_NUM_Y_TILES (((65536 / (640/8)) / Y_TILESIZE) + 1)
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// #define BX_NUM_Y_TILES (480/Y_TILESIZE)
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// Support varying number of rows of text. This used to
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// be limited to only 25 lines.
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#define BX_MAX_TEXT_LINES 260
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#if BX_USE_VGA_SMF
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# define BX_VGA_SMF static
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# define BX_VGA_THIS bx_vga.
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#else
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# define BX_VGA_SMF
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# define BX_VGA_THIS this->
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#endif
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class bx_vga_c : public logfunctions {
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public:
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bx_vga_c(void);
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~bx_vga_c(void);
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BX_VGA_SMF void init(bx_devices_c *, bx_cmos_c *cmos);
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BX_VGA_SMF Bit8u mem_read(Bit32u addr);
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// Note: either leave value of type Bit8u, or mask it when
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// used to 8 bits, in memory.cc
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BX_VGA_SMF void mem_write(Bit32u addr, Bit8u value);
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BX_VGA_SMF void redraw_area(unsigned x0, unsigned y0,
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unsigned width, unsigned height);
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private:
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static Bit32u read_handler(void *this_ptr, Bit32u address, unsigned io_len);
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static void write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len);
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static void write_handler_no_log(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len);
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struct {
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struct {
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Boolean color_emulation; // 1=color emulation, base address = 3Dx
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// 0=mono emulation, base address = 3Bx
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Boolean enable_ram; // enable CPU access to video memory if set
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Bit8u clock_select; // 0=25Mhz 1=28Mhz
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Boolean select_high_bank; // when in odd/even modes, select
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// high 64k bank if set
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Boolean horiz_sync_pol; // bit6: negative if set
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Boolean vert_sync_pol; // bit7: negative if set
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// bit7,bit6 represent number of lines on display:
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// 0 = reserved
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// 1 = 400 lines
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// 2 = 350 lines
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// 3 - 480 lines
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} misc_output;
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struct {
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Bit8u address;
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Bit8u reg[0x19];
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} CRTC;
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struct {
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Boolean flip_flop; /* 0 = address, 1 = data-write */
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unsigned address; /* register number */
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Boolean video_enabled;
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Bit8u palette_reg[16];
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Bit8u overscan_color;
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Bit8u color_plane_enable;
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Bit8u horiz_pel_panning;
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Bit8u color_select;
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struct {
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Boolean graphics_alpha;
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Boolean display_type;
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Boolean enable_line_graphics;
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Boolean blink_intensity;
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Boolean pixel_panning_compat;
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Boolean pixel_clock_select;
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Boolean internal_palette_size;
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} mode_ctrl;
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} attribute_ctrl;
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struct {
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Bit8u write_data_register;
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Bit8u write_data_cycle; /* 0, 1, 2 */
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Bit8u read_data_register;
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Bit8u read_data_cycle; /* 0, 1, 2 */
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struct {
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Bit8u red;
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Bit8u green;
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Bit8u blue;
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} data[256];
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Bit8u mask;
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} pel;
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struct {
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Bit8u index;
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Bit8u set_reset;
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Bit8u enable_set_reset;
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Bit8u color_compare;
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Bit8u data_rotate;
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Bit8u raster_op;
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Bit8u read_map_select;
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Bit8u write_mode;
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Boolean read_mode;
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Boolean odd_even;
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Boolean chain_odd_even;
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Bit8u shift_reg;
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Boolean graphics_alpha;
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Bit8u memory_mapping; /* 0 = use A0000-BFFFF
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* 1 = use A0000-AFFFF EGA/VGA graphics modes
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* 2 = use B0000-B7FFF Monochrome modes
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* 3 = use B8000-BFFFF CGA modes
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*/
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Bit8u color_dont_care;
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Bit8u bitmask;
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Bit8u latch[4];
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} graphics_ctrl;
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struct {
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Bit8u index;
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Bit8u map_mask;
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Boolean map_mask_bit[4];
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Boolean bit0;
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Boolean bit1;
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Bit8u reg1;
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Bit8u char_map_select;
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Boolean extended_mem;
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Boolean odd_even;
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Boolean chain_four;
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} sequencer;
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Boolean vga_mem_updated;
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unsigned x_tilesize;
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unsigned y_tilesize;
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unsigned scan_bits;
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Boolean vga_tile_updated[BX_NUM_X_TILES][BX_NUM_Y_TILES];
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Bit8u vga_memory[256 * 1024];
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Bit8u text_snapshot[2 * 80 * BX_MAX_TEXT_LINES]; // current text snapshot
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unsigned horiz_tick;
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unsigned vert_tick;
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Bit8u rgb[3 * 256];
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Bit8u tile[X_TILESIZE * Y_TILESIZE];
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} s; // state information
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bx_devices_c *devices;
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#if !BX_USE_VGA_SMF
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Bit32u read(Bit32u address, unsigned io_len);
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void write(Bit32u address, Bit32u value, unsigned io_len, Boolean no_log);
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#else
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void write(Bit32u address, Bit32u value, unsigned io_len, Boolean no_log);
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#endif
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int timer_id;
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public:
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static void timer_handler(void *);
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BX_VGA_SMF void timer(void);
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BX_VGA_SMF void set_update_interval (unsigned interval);
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private:
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BX_VGA_SMF void update(void);
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BX_VGA_SMF void dump_status(void);
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BX_VGA_SMF void determine_screen_dimensions(unsigned *piHeight,
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unsigned *piWidth);
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};
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extern bx_vga_c bx_vga;
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