diff options
Diffstat (limited to 'drivers/video/console/vgacon.c')
| -rw-r--r-- | drivers/video/console/vgacon.c | 1103 |
1 files changed, 1103 insertions, 0 deletions
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c new file mode 100644 index 0000000..7d1ae06 --- /dev/null +++ b/drivers/video/console/vgacon.c @@ -0,0 +1,1103 @@ +/* + * linux/drivers/video/vgacon.c -- Low level VGA based console driver + * + * Created 28 Sep 1997 by Geert Uytterhoeven + * + * Rewritten by Martin Mares <mj@ucw.cz>, July 1998 + * + * This file is based on the old console.c, vga.c and vesa_blank.c drivers. + * + * Copyright (C) 1991, 1992 Linus Torvalds + * 1995 Jay Estabrook + * + * User definable mapping table and font loading by Eugene G. Crosser, + * <crosser@average.org> + * + * Improved loadable font/UTF-8 support by H. Peter Anvin + * Feb-Sep 1995 <peter.anvin@linux.org> + * + * Colour palette handling, by Simon Tatham + * 17-Jun-95 <sgt20@cam.ac.uk> + * + * if 512 char mode is already enabled don't re-enable it, + * because it causes screen to flicker, by Mitja Horvat + * 5-May-96 <mitja.horvat@guest.arnes.si> + * + * Use 2 outw instead of 4 outb_p to reduce erroneous text + * flashing on RHS of screen during heavy console scrolling . + * Oct 1996, Paul Gortmaker. + * + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive for + * more details. + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/fs.h> +#include <linux/kernel.h> +#include <linux/tty.h> +#include <linux/console.h> +#include <linux/string.h> +#include <linux/kd.h> +#include <linux/slab.h> +#include <linux/vt_kern.h> +#include <linux/selection.h> +#include <linux/spinlock.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <linux/smp_lock.h> +#include <video/vga.h> +#include <asm/io.h> + +static DEFINE_SPINLOCK(vga_lock); +static int cursor_size_lastfrom; +static int cursor_size_lastto; +static struct vgastate state; + +#define BLANK 0x0020 + +#define CAN_LOAD_EGA_FONTS /* undefine if the user must not do this */ +#define CAN_LOAD_PALETTE /* undefine if the user must not do this */ + +/* You really do _NOT_ want to define this, unless you have buggy + * Trident VGA which will resize cursor when moving it between column + * 15 & 16. If you define this and your VGA is OK, inverse bug will + * appear. + */ +#undef TRIDENT_GLITCH + +/* + * Interface used by the world + */ + +static const char *vgacon_startup(void); +static void vgacon_init(struct vc_data *c, int init); +static void vgacon_deinit(struct vc_data *c); +static void vgacon_cursor(struct vc_data *c, int mode); +static int vgacon_switch(struct vc_data *c); +static int vgacon_blank(struct vc_data *c, int blank, int mode_switch); +static int vgacon_set_palette(struct vc_data *vc, unsigned char *table); +static int vgacon_scrolldelta(struct vc_data *c, int lines); +static int vgacon_set_origin(struct vc_data *c); +static void vgacon_save_screen(struct vc_data *c); +static int vgacon_scroll(struct vc_data *c, int t, int b, int dir, + int lines); +static u8 vgacon_build_attr(struct vc_data *c, u8 color, u8 intensity, + u8 blink, u8 underline, u8 reverse); +static void vgacon_invert_region(struct vc_data *c, u16 * p, int count); +static unsigned long vgacon_uni_pagedir[2]; + + +/* Description of the hardware situation */ +static unsigned long vga_vram_base; /* Base of video memory */ +static unsigned long vga_vram_end; /* End of video memory */ +static u16 vga_video_port_reg; /* Video register select port */ +static u16 vga_video_port_val; /* Video register value port */ +static unsigned int vga_video_num_columns; /* Number of text columns */ +static unsigned int vga_video_num_lines; /* Number of text lines */ +static int vga_can_do_color = 0; /* Do we support colors? */ +static unsigned int vga_default_font_height;/* Height of default screen font */ +static unsigned char vga_video_type; /* Card type */ +static unsigned char vga_hardscroll_enabled; +static unsigned char vga_hardscroll_user_enable = 1; +static unsigned char vga_font_is_default = 1; +static int vga_vesa_blanked; +static int vga_palette_blanked; +static int vga_is_gfx; +static int vga_512_chars; +static int vga_video_font_height; +static int vga_scan_lines; +static unsigned int vga_rolled_over = 0; + +static int __init no_scroll(char *str) +{ + /* + * Disabling scrollback is required for the Braillex ib80-piezo + * Braille reader made by F.H. Papenmeier (Germany). + * Use the "no-scroll" bootflag. + */ + vga_hardscroll_user_enable = vga_hardscroll_enabled = 0; + return 1; +} + +__setup("no-scroll", no_scroll); + +/* + * By replacing the four outb_p with two back to back outw, we can reduce + * the window of opportunity to see text mislocated to the RHS of the + * console during heavy scrolling activity. However there is the remote + * possibility that some pre-dinosaur hardware won't like the back to back + * I/O. Since the Xservers get away with it, we should be able to as well. + */ +static inline void write_vga(unsigned char reg, unsigned int val) +{ + unsigned int v1, v2; + unsigned long flags; + + /* + * ddprintk might set the console position from interrupt + * handlers, thus the write has to be IRQ-atomic. + */ + spin_lock_irqsave(&vga_lock, flags); + +#ifndef SLOW_VGA + v1 = reg + (val & 0xff00); + v2 = reg + 1 + ((val << 8) & 0xff00); + outw(v1, vga_video_port_reg); + outw(v2, vga_video_port_reg); +#else + outb_p(reg, vga_video_port_reg); + outb_p(val >> 8, vga_video_port_val); + outb_p(reg + 1, vga_video_port_reg); + outb_p(val & 0xff, vga_video_port_val); +#endif + spin_unlock_irqrestore(&vga_lock, flags); +} + +static const char __init *vgacon_startup(void) +{ + const char *display_desc = NULL; + u16 saved1, saved2; + volatile u16 *p; + + if (ORIG_VIDEO_ISVGA == VIDEO_TYPE_VLFB) { + no_vga: +#ifdef CONFIG_DUMMY_CONSOLE + conswitchp = &dummy_con; + return conswitchp->con_startup(); +#else + return NULL; +#endif + } + + /* VGA16 modes are not handled by VGACON */ + if ((ORIG_VIDEO_MODE == 0x0D) || /* 320x200/4 */ + (ORIG_VIDEO_MODE == 0x0E) || /* 640x200/4 */ + (ORIG_VIDEO_MODE == 0x10) || /* 640x350/4 */ + (ORIG_VIDEO_MODE == 0x12) || /* 640x480/4 */ + (ORIG_VIDEO_MODE == 0x6A)) /* 800x600/4, 0x6A is very common */ + goto no_vga; + + vga_video_num_lines = ORIG_VIDEO_LINES; + vga_video_num_columns = ORIG_VIDEO_COLS; + state.vgabase = NULL; + + if (ORIG_VIDEO_MODE == 7) { /* Is this a monochrome display? */ + vga_vram_base = 0xb0000; + vga_video_port_reg = VGA_CRT_IM; + vga_video_port_val = VGA_CRT_DM; + if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10) { + static struct resource ega_console_resource = + { "ega", 0x3B0, 0x3BF }; + vga_video_type = VIDEO_TYPE_EGAM; + vga_vram_end = 0xb8000; + display_desc = "EGA+"; + request_resource(&ioport_resource, + &ega_console_resource); + } else { + static struct resource mda1_console_resource = + { "mda", 0x3B0, 0x3BB }; + static struct resource mda2_console_resource = + { "mda", 0x3BF, 0x3BF }; + vga_video_type = VIDEO_TYPE_MDA; + vga_vram_end = 0xb2000; + display_desc = "*MDA"; + request_resource(&ioport_resource, + &mda1_console_resource); + request_resource(&ioport_resource, + &mda2_console_resource); + vga_video_font_height = 14; + } + } else { + /* If not, it is color. */ + vga_can_do_color = 1; + vga_vram_base = 0xb8000; + vga_video_port_reg = VGA_CRT_IC; + vga_video_port_val = VGA_CRT_DC; + if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10) { + int i; + + vga_vram_end = 0xc0000; + + if (!ORIG_VIDEO_ISVGA) { + static struct resource ega_console_resource + = { "ega", 0x3C0, 0x3DF }; + vga_video_type = VIDEO_TYPE_EGAC; + display_desc = "EGA"; + request_resource(&ioport_resource, + &ega_console_resource); + } else { + static struct resource vga_console_resource + = { "vga+", 0x3C0, 0x3DF }; + vga_video_type = VIDEO_TYPE_VGAC; + display_desc = "VGA+"; + request_resource(&ioport_resource, + &vga_console_resource); + +#ifdef VGA_CAN_DO_64KB + /* + * get 64K rather than 32K of video RAM. + * This doesn't actually work on all "VGA" + * controllers (it seems like setting MM=01 + * and COE=1 isn't necessarily a good idea) + */ + vga_vram_base = 0xa0000; + vga_vram_end = 0xb0000; + outb_p(6, VGA_GFX_I); + outb_p(6, VGA_GFX_D); +#endif + /* + * Normalise the palette registers, to point + * the 16 screen colours to the first 16 + * DAC entries. + */ + + for (i = 0; i < 16; i++) { + inb_p(VGA_IS1_RC); + outb_p(i, VGA_ATT_W); + outb_p(i, VGA_ATT_W); + } + outb_p(0x20, VGA_ATT_W); + + /* + * Now set the DAC registers back to their + * default values + */ + for (i = 0; i < 16; i++) { + outb_p(color_table[i], VGA_PEL_IW); + outb_p(default_red[i], VGA_PEL_D); + outb_p(default_grn[i], VGA_PEL_D); + outb_p(default_blu[i], VGA_PEL_D); + } + } + } else { + static struct resource cga_console_resource = + { "cga", 0x3D4, 0x3D5 }; + vga_video_type = VIDEO_TYPE_CGA; + vga_vram_end = 0xba000; + display_desc = "*CGA"; + request_resource(&ioport_resource, + &cga_console_resource); + vga_video_font_height = 8; + } + } + + vga_vram_base = VGA_MAP_MEM(vga_vram_base); + vga_vram_end = VGA_MAP_MEM(vga_vram_end); + + /* + * Find out if there is a graphics card present. + * Are there smarter methods around? + */ + p = (volatile u16 *) vga_vram_base; + saved1 = scr_readw(p); + saved2 = scr_readw(p + 1); + scr_writew(0xAA55, p); + scr_writew(0x55AA, p + 1); + if (scr_readw(p) != 0xAA55 || scr_readw(p + 1) != 0x55AA) { + scr_writew(saved1, p); + scr_writew(saved2, p + 1); + goto no_vga; + } + scr_writew(0x55AA, p); + scr_writew(0xAA55, p + 1); + if (scr_readw(p) != 0x55AA || scr_readw(p + 1) != 0xAA55) { + scr_writew(saved1, p); + scr_writew(saved2, p + 1); + goto no_vga; + } + scr_writew(saved1, p); + scr_writew(saved2, p + 1); + + if (vga_video_type == VIDEO_TYPE_EGAC + || vga_video_type == VIDEO_TYPE_VGAC + || vga_video_type == VIDEO_TYPE_EGAM) { + vga_hardscroll_enabled = vga_hardscroll_user_enable; + vga_default_font_height = ORIG_VIDEO_POINTS; + vga_video_font_height = ORIG_VIDEO_POINTS; + /* This may be suboptimal but is a safe bet - go with it */ + vga_scan_lines = + vga_video_font_height * vga_video_num_lines; + } + return display_desc; +} + +static void vgacon_init(struct vc_data *c, int init) +{ + unsigned long p; + + /* We cannot be loaded as a module, therefore init is always 1 */ + c->vc_can_do_color = vga_can_do_color; + c->vc_cols = vga_video_num_columns; + c->vc_rows = vga_video_num_lines; + c->vc_scan_lines = vga_scan_lines; + c->vc_font.height = vga_video_font_height; + c->vc_complement_mask = 0x7700; + p = *c->vc_uni_pagedir_loc; + if (c->vc_uni_pagedir_loc == &c->vc_uni_pagedir || + !--c->vc_uni_pagedir_loc[1]) + con_free_unimap(c); + c->vc_uni_pagedir_loc = vgacon_uni_pagedir; + vgacon_uni_pagedir[1]++; + if (!vgacon_uni_pagedir[0] && p) + con_set_default_unimap(c); +} + +static inline void vga_set_mem_top(struct vc_data *c) +{ + write_vga(12, (c->vc_visible_origin - vga_vram_base) / 2); +} + +static void vgacon_deinit(struct vc_data *c) +{ + /* When closing the last console, reset video origin */ + if (!--vgacon_uni_pagedir[1]) { + c->vc_visible_origin = vga_vram_base; + vga_set_mem_top(c); + con_free_unimap(c); + } + c->vc_uni_pagedir_loc = &c->vc_uni_pagedir; + con_set_default_unimap(c); +} + +static u8 vgacon_build_attr(struct vc_data *c, u8 color, u8 intensity, + u8 blink, u8 underline, u8 reverse) +{ + u8 attr = color; + + if (vga_can_do_color) { + if (underline) + attr = (attr & 0xf0) | c->vc_ulcolor; + else if (intensity == 0) + attr = (attr & 0xf0) | c->vc_halfcolor; + } + if (reverse) + attr = + ((attr) & 0x88) | ((((attr) >> 4) | ((attr) << 4)) & + 0x77); + if (blink) + attr ^= 0x80; + if (intensity == 2) + attr ^= 0x08; + if (!vga_can_do_color) { + if (underline) + attr = (attr & 0xf8) | 0x01; + else if (intensity == 0) + attr = (attr & 0xf0) | 0x08; + } + return attr; +} + +static void vgacon_invert_region(struct vc_data *c, u16 * p, int count) +{ + int col = vga_can_do_color; + + while (count--) { + u16 a = scr_readw(p); + if (col) + a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | + (((a) & 0x0700) << 4); + else + a ^= ((a & 0x0700) == 0x0100) ? 0x7000 : 0x7700; + scr_writew(a, p++); + } +} + +static void vgacon_set_cursor_size(int xpos, int from, int to) +{ + unsigned long flags; + int curs, cure; + +#ifdef TRIDENT_GLITCH + if (xpos < 16) + from--, to--; +#endif + + if ((from == cursor_size_lastfrom) && (to == cursor_size_lastto)) + return; + cursor_size_lastfrom = from; + cursor_size_lastto = to; + + spin_lock_irqsave(&vga_lock, flags); + outb_p(0x0a, vga_video_port_reg); /* Cursor start */ + curs = inb_p(vga_video_port_val); + outb_p(0x0b, vga_video_port_reg); /* Cursor end */ + cure = inb_p(vga_video_port_val); + + curs = (curs & 0xc0) | from; + cure = (cure & 0xe0) | to; + + outb_p(0x0a, vga_video_port_reg); /* Cursor start */ + outb_p(curs, vga_video_port_val); + outb_p(0x0b, vga_video_port_reg); /* Cursor end */ + outb_p(cure, vga_video_port_val); + spin_unlock_irqrestore(&vga_lock, flags); +} + +static void vgacon_cursor(struct vc_data *c, int mode) +{ + if (c->vc_origin != c->vc_visible_origin) + vgacon_scrolldelta(c, 0); + switch (mode) { + case CM_ERASE: + write_vga(14, (vga_vram_end - vga_vram_base - 1) / 2); + break; + + case CM_MOVE: + case CM_DRAW: + write_vga(14, (c->vc_pos - vga_vram_base) / 2); + switch (c->vc_cursor_type & 0x0f) { + case CUR_UNDERLINE: + vgacon_set_cursor_size(c->vc_x, + c->vc_font.height - + (c->vc_font.height < + 10 ? 2 : 3), + c->vc_font.height - + (c->vc_font.height < + 10 ? 1 : 2)); + break; + case CUR_TWO_THIRDS: + vgacon_set_cursor_size(c->vc_x, + c->vc_font.height / 3, + c->vc_font.height - + (c->vc_font.height < + 10 ? 1 : 2)); + break; + case CUR_LOWER_THIRD: + vgacon_set_cursor_size(c->vc_x, + (c->vc_font.height * 2) / 3, + c->vc_font.height - + (c->vc_font.height < + 10 ? 1 : 2)); + break; + case CUR_LOWER_HALF: + vgacon_set_cursor_size(c->vc_x, + c->vc_font.height / 2, + c->vc_font.height - + (c->vc_font.height < + 10 ? 1 : 2)); + break; + case CUR_NONE: + vgacon_set_cursor_size(c->vc_x, 31, 30); + break; + default: + vgacon_set_cursor_size(c->vc_x, 1, + c->vc_font.height); + break; + } + break; + } +} + +static int vgacon_switch(struct vc_data *c) +{ + /* + * We need to save screen size here as it's the only way + * we can spot the screen has been resized and we need to + * set size of freshly allocated screens ourselves. + */ + vga_video_num_columns = c->vc_cols; + vga_video_num_lines = c->vc_rows; + if (!vga_is_gfx) + scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf, + c->vc_screenbuf_size); + return 0; /* Redrawing not needed */ +} + +static void vga_set_palette(struct vc_data *vc, unsigned char *table) +{ + int i, j; + + for (i = j = 0; i < 16; i++) { + vga_w(state.vgabase, VGA_PEL_IW, table[i]); + vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2); + vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2); + vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2); + } +} + +static int vgacon_set_palette(struct vc_data *vc, unsigned char *table) +{ +#ifdef CAN_LOAD_PALETTE + if (vga_video_type != VIDEO_TYPE_VGAC || vga_palette_blanked + || !CON_IS_VISIBLE(vc)) + return -EINVAL; + vga_set_palette(vc, table); + return 0; +#else + return -EINVAL; +#endif +} + +/* structure holding original VGA register settings */ +static struct { + unsigned char SeqCtrlIndex; /* Sequencer Index reg. */ + unsigned char CrtCtrlIndex; /* CRT-Contr. Index reg. */ + unsigned char CrtMiscIO; /* Miscellaneous register */ + unsigned char HorizontalTotal; /* CRT-Controller:00h */ + unsigned char HorizDisplayEnd; /* CRT-Controller:01h */ + unsigned char StartHorizRetrace; /* CRT-Controller:04h */ + unsigned char EndHorizRetrace; /* CRT-Controller:05h */ + unsigned char Overflow; /* CRT-Controller:07h */ + unsigned char StartVertRetrace; /* CRT-Controller:10h */ + unsigned char EndVertRetrace; /* CRT-Controller:11h */ + unsigned char ModeControl; /* CRT-Controller:17h */ + unsigned char ClockingMode; /* Seq-Controller:01h */ +} vga_state; + +static void vga_vesa_blank(struct vgastate *state, int mode) +{ + /* save original values of VGA controller registers */ + if (!vga_vesa_blanked) { + spin_lock_irq(&vga_lock); + vga_state.SeqCtrlIndex = vga_r(state->vgabase, VGA_SEQ_I); + vga_state.CrtCtrlIndex = inb_p(vga_video_port_reg); + vga_state.CrtMiscIO = vga_r(state->vgabase, VGA_MIS_R); + spin_unlock_irq(&vga_lock); + + outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */ + vga_state.HorizontalTotal = inb_p(vga_video_port_val); + outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */ + vga_state.HorizDisplayEnd = inb_p(vga_video_port_val); + outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */ + vga_state.StartHorizRetrace = inb_p(vga_video_port_val); + outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */ + vga_state.EndHorizRetrace = inb_p(vga_video_port_val); + outb_p(0x07, vga_video_port_reg); /* Overflow */ + vga_state.Overflow = inb_p(vga_video_port_val); + outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */ + vga_state.StartVertRetrace = inb_p(vga_video_port_val); + outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */ + vga_state.EndVertRetrace = inb_p(vga_video_port_val); + outb_p(0x17, vga_video_port_reg); /* ModeControl */ + vga_state.ModeControl = inb_p(vga_video_port_val); + vga_state.ClockingMode = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE); + } + + /* assure that video is enabled */ + /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */ + spin_lock_irq(&vga_lock); + vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode | 0x20); + + /* test for vertical retrace in process.... */ + if ((vga_state.CrtMiscIO & 0x80) == 0x80) + vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO & 0xEF); + + /* + * Set <End of vertical retrace> to minimum (0) and + * <Start of vertical Retrace> to maximum (incl. overflow) + * Result: turn off vertical sync (VSync) pulse. + */ + if (mode & VESA_VSYNC_SUSPEND) { + outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */ + outb_p(0xff, vga_video_port_val); /* maximum value */ + outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */ + outb_p(0x40, vga_video_port_val); /* minimum (bits 0..3) */ + outb_p(0x07, vga_video_port_reg); /* Overflow */ + outb_p(vga_state.Overflow | 0x84, vga_video_port_val); /* bits 9,10 of vert. retrace */ + } + + if (mode & VESA_HSYNC_SUSPEND) { + /* + * Set <End of horizontal retrace> to minimum (0) and + * <Start of horizontal Retrace> to maximum + * Result: turn off horizontal sync (HSync) pulse. + */ + outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */ + outb_p(0xff, vga_video_port_val); /* maximum */ + outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */ + outb_p(0x00, vga_video_port_val); /* minimum (0) */ + } + + /* restore both index registers */ + vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex); + outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg); + spin_unlock_irq(&vga_lock); +} + +static void vga_vesa_unblank(struct vgastate *state) +{ + /* restore original values of VGA controller registers */ + spin_lock_irq(&vga_lock); + vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO); + + outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */ + outb_p(vga_state.HorizontalTotal, vga_video_port_val); + outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */ + outb_p(vga_state.HorizDisplayEnd, vga_video_port_val); + outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */ + outb_p(vga_state.StartHorizRetrace, vga_video_port_val); + outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */ + outb_p(vga_state.EndHorizRetrace, vga_video_port_val); + outb_p(0x07, vga_video_port_reg); /* Overflow */ + outb_p(vga_state.Overflow, vga_video_port_val); + outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */ + outb_p(vga_state.StartVertRetrace, vga_video_port_val); + outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */ + outb_p(vga_state.EndVertRetrace, vga_video_port_val); + outb_p(0x17, vga_video_port_reg); /* ModeControl */ + outb_p(vga_state.ModeControl, vga_video_port_val); + /* ClockingMode */ + vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode); + + /* restore index/control registers */ + vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex); + outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg); + spin_unlock_irq(&vga_lock); +} + +static void vga_pal_blank(struct vgastate *state) +{ + int i; + + for (i = 0; i < 16; i++) { + vga_w(state->vgabase, VGA_PEL_IW, i); + vga_w(state->vgabase, VGA_PEL_D, 0); + vga_w(state->vgabase, VGA_PEL_D, 0); + vga_w(state->vgabase, VGA_PEL_D, 0); + } +} + +static int vgacon_blank(struct vc_data *c, int blank, int mode_switch) +{ + switch (blank) { + case 0: /* Unblank */ + if (vga_vesa_blanked) { + vga_vesa_unblank(&state); + vga_vesa_blanked = 0; + } + if (vga_palette_blanked) { + vga_set_palette(c, color_table); + vga_palette_blanked = 0; + return 0; + } + vga_is_gfx = 0; + /* Tell console.c that it has to restore the screen itself */ + return 1; + case 1: /* Normal blanking */ + case -1: /* Obsolete */ + if (!mode_switch && vga_video_type == VIDEO_TYPE_VGAC) { + vga_pal_blank(&state); + vga_palette_blanked = 1; + return 0; + } + vgacon_set_origin(c); + scr_memsetw((void *) vga_vram_base, BLANK, + c->vc_screenbuf_size); + if (mode_switch) + vga_is_gfx = 1; + return 1; + default: /* VESA blanking */ + if (vga_video_type == VIDEO_TYPE_VGAC) { + vga_vesa_blank(&state, blank - 1); + vga_vesa_blanked = blank; + } + return 0; + } +} + +/* + * PIO_FONT support. + * + * The font loading code goes back to the codepage package by + * Joel Hoffman (joel@wam.umd.edu). (He reports that the original + * reference is: "From: p. 307 of _Programmer's Guide to PC & PS/2 + * Video Systems_ by Richard Wilton. 1987. Microsoft Press".) + * + * Change for certain monochrome monitors by Yury Shevchuck + * (sizif@botik.yaroslavl.su). + */ + +#ifdef CAN_LOAD_EGA_FONTS + +#define colourmap 0xa0000 +/* Pauline Middelink <middelin@polyware.iaf.nl> reports that we + should use 0xA0000 for the bwmap as well.. */ +#define blackwmap 0xa0000 +#define cmapsz 8192 + +static int vgacon_do_font_op(struct vgastate *state,char *arg,int set,int ch512) +{ + unsigned short video_port_status = vga_video_port_reg + 6; + int font_select = 0x00, beg, i; + char *charmap; + + if (vga_video_type != VIDEO_TYPE_EGAM) { + charmap = (char *) VGA_MAP_MEM(colourmap); + beg = 0x0e; +#ifdef VGA_CAN_DO_64KB + if (vga_video_type == VIDEO_TYPE_VGAC) + beg = 0x06; +#endif + } else { + charmap = (char *) VGA_MAP_MEM(blackwmap); + beg = 0x0a; + } + +#ifdef BROKEN_GRAPHICS_PROGRAMS + /* + * All fonts are loaded in slot 0 (0:1 for 512 ch) + */ + + if (!arg) + return -EINVAL; /* Return to default font not supported */ + + vga_font_is_default = 0; + font_select = ch512 ? 0x04 : 0x00; +#else + /* + * The default font is kept in slot 0 and is never touched. + * A custom font is loaded in slot 2 (256 ch) or 2:3 (512 ch) + */ + + if (set) { + vga_font_is_default = !arg; + if (!arg) + ch512 = 0; /* Default font is always 256 */ + font_select = arg ? (ch512 ? 0x0e : 0x0a) : 0x00; + } + + if (!vga_font_is_default) + charmap += 4 * cmapsz; +#endif + + unlock_kernel(); + spin_lock_irq(&vga_lock); + /* First, the Sequencer */ + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1); + /* CPU writes only to map 2 */ + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x04); + /* Sequential addressing */ + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x07); + /* Clear synchronous reset */ + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03); + + /* Now, the graphics controller, select map 2 */ + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x02); + /* disable odd-even addressing */ + vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x00); + /* map start at A000:0000 */ + vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x00); + spin_unlock_irq(&vga_lock); + + if (arg) { + if (set) + for (i = 0; i < cmapsz; i++) + vga_writeb(arg[i], charmap + i); + else + for (i = 0; i < cmapsz; i++) + arg[i] = vga_readb(charmap + i); + + /* + * In 512-character mode, the character map is not contiguous if + * we want to remain EGA compatible -- which we do + */ + + if (ch512) { + charmap += 2 * cmapsz; + arg += cmapsz; + if (set) + for (i = 0; i < cmapsz; i++) + vga_writeb(arg[i], charmap + i); + else + for (i = 0; i < cmapsz; i++) + arg[i] = vga_readb(charmap + i); + } + } + + spin_lock_irq(&vga_lock); + /* First, the sequencer, Synchronous reset */ + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01); + /* CPU writes to maps 0 and 1 */ + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x03); + /* odd-even addressing */ + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x03); + /* Character Map Select */ + if (set) + vga_wseq(state->vgabase, VGA_SEQ_CHARACTER_MAP, font_select); + /* clear synchronous reset */ + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03); + + /* Now, the graphics controller, select map 0 for CPU */ + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x00); + /* enable even-odd addressing */ + vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x10); + /* map starts at b800:0 or b000:0 */ + vga_wgfx(state->vgabase, VGA_GFX_MISC, beg); + + /* if 512 char mode is already enabled don't re-enable it. */ + if ((set) && (ch512 != vga_512_chars)) { + int i; + + /* attribute controller */ + for (i = 0; i < MAX_NR_CONSOLES; i++) { + struct vc_data *c = vc_cons[i].d; + if (c && c->vc_sw == &vga_con) + c->vc_hi_font_mask = ch512 ? 0x0800 : 0; + } + vga_512_chars = ch512; + /* 256-char: enable intensity bit + 512-char: disable intensity bit */ + inb_p(video_port_status); /* clear address flip-flop */ + /* color plane enable register */ + vga_wattr(state->vgabase, VGA_ATC_PLANE_ENABLE, ch512 ? 0x07 : 0x0f); + /* Wilton (1987) mentions the following; I don't know what + it means, but it works, and it appears necessary */ + inb_p(video_port_status); + vga_wattr(state->vgabase, VGA_AR_ENABLE_DISPLAY, 0); + } + spin_unlock_irq(&vga_lock); + lock_kernel(); + return 0; +} + +/* + * Adjust the screen to fit a font of a certain height + */ +static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight) +{ + unsigned char ovr, vde, fsr; + int rows, maxscan, i; + + rows = vc->vc_scan_lines / fontheight; /* Number of video rows we end up with */ + maxscan = rows * fontheight - 1; /* Scan lines to actually display-1 */ + + /* Reprogram the CRTC for the new font size + Note: the attempt to read the overflow register will fail + on an EGA, but using 0xff for the previous value appears to + be OK for EGA text modes in the range 257-512 scan lines, so I + guess we don't need to worry about it. + + The same applies for the spill bits in the font size and cursor + registers; they are write-only on EGA, but it appears that they + are all don't care bits on EGA, so I guess it doesn't matter. */ + + spin_lock_irq(&vga_lock); + outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */ + ovr = inb_p(vga_video_port_val); + outb_p(0x09, vga_video_port_reg); /* Font size register */ + fsr = inb_p(vga_video_port_val); + spin_unlock_irq(&vga_lock); + + vde = maxscan & 0xff; /* Vertical display end reg */ + ovr = (ovr & 0xbd) + /* Overflow register */ + ((maxscan & 0x100) >> 7) + ((maxscan & 0x200) >> 3); + fsr = (fsr & 0xe0) + (fontheight - 1); /* Font size register */ + + spin_lock_irq(&vga_lock); + outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */ + outb_p(ovr, vga_video_port_val); + outb_p(0x09, vga_video_port_reg); /* Font size */ + outb_p(fsr, vga_video_port_val); + outb_p(0x12, vga_video_port_reg); /* Vertical display limit */ + outb_p(vde, vga_video_port_val); + spin_unlock_irq(&vga_lock); + + for (i = 0; i < MAX_NR_CONSOLES; i++) { + struct vc_data *c = vc_cons[i].d; + + if (c && c->vc_sw == &vga_con) { + if (CON_IS_VISIBLE(c)) { + /* void size to cause regs to be rewritten */ + cursor_size_lastfrom = 0; + cursor_size_lastto = 0; + c->vc_sw->con_cursor(c, CM_DRAW); + } + c->vc_font.height = fontheight; + vc_resize(c, 0, rows); /* Adjust console size */ + } + } + return 0; +} + +static int vgacon_font_set(struct vc_data *c, struct console_font *font, unsigned flags) +{ + unsigned charcount = font->charcount; + int rc; + + if (vga_video_type < VIDEO_TYPE_EGAM) + return -EINVAL; + + if (font->width != 8 || (charcount != 256 && charcount != 512)) + return -EINVAL; + + rc = vgacon_do_font_op(&state, font->data, 1, charcount == 512); + if (rc) + return rc; + + if (!(flags & KD_FONT_FLAG_DONT_RECALC)) + rc = vgacon_adjust_height(c, font->height); + return rc; +} + +static int vgacon_font_get(struct vc_data *c, struct console_font *font) +{ + if (vga_video_type < VIDEO_TYPE_EGAM) + return -EINVAL; + + font->width = 8; + font->height = c->vc_font.height; + font->charcount = vga_512_chars ? 512 : 256; + if (!font->data) + return 0; + return vgacon_do_font_op(&state, font->data, 0, 0); +} + +#else + +#define vgacon_font_set NULL +#define vgacon_font_get NULL + +#endif + +static int vgacon_scrolldelta(struct vc_data *c, int lines) +{ + if (!lines) /* Turn scrollback off */ + c->vc_visible_origin = c->vc_origin; + else { + int vram_size = vga_vram_end - vga_vram_base; + int margin = c->vc_size_row * 4; + int ul, we, p, st; + + if (vga_rolled_over > + (c->vc_scr_end - vga_vram_base) + margin) { + ul = c->vc_scr_end - vga_vram_base; + we = vga_rolled_over + c->vc_size_row; + } else { + ul = 0; + we = vram_size; + } + p = (c->vc_visible_origin - vga_vram_base - ul + we) % we + + lines * c->vc_size_row; + st = (c->vc_origin - vga_vram_base - ul + we) % we; + if (st < 2 * margin) + margin = 0; + if (p < margin) + p = 0; + if (p > st - margin) + p = st; + c->vc_visible_origin = vga_vram_base + (p + ul) % we; + } + vga_set_mem_top(c); + return 1; +} + +static int vgacon_set_origin(struct vc_data *c) +{ + if (vga_is_gfx || /* We don't play origin tricks in graphic modes */ + (console_blanked && !vga_palette_blanked)) /* Nor we write to blanked screens */ + return 0; + c->vc_origin = c->vc_visible_origin = vga_vram_base; + vga_set_mem_top(c); + vga_rolled_over = 0; + return 1; +} + +static void vgacon_save_screen(struct vc_data *c) +{ + static int vga_bootup_console = 0; + + if (!vga_bootup_console) { + /* This is a gross hack, but here is the only place we can + * set bootup console parameters without messing up generic + * console initialization routines. + */ + vga_bootup_console = 1; + c->vc_x = ORIG_X; + c->vc_y = ORIG_Y; + } + if (!vga_is_gfx) + scr_memcpyw((u16 *) c->vc_screenbuf, (u16 *) c->vc_origin, + c->vc_screenbuf_size); +} + +static int vgacon_scroll(struct vc_data *c, int t, int b, int dir, + int lines) +{ + unsigned long oldo; + unsigned int delta; + + if (t || b != c->vc_rows || vga_is_gfx) + return 0; + + if (c->vc_origin != c->vc_visible_origin) + vgacon_scrolldelta(c, 0); + + if (!vga_hardscroll_enabled || lines >= c->vc_rows / 2) + return 0; + + oldo = c->vc_origin; + delta = lines * c->vc_size_row; + if (dir == SM_UP) { + if (c->vc_scr_end + delta >= vga_vram_end) { + scr_memcpyw((u16 *) vga_vram_base, + (u16 *) (oldo + delta), + c->vc_screenbuf_size - delta); + c->vc_origin = vga_vram_base; + vga_rolled_over = oldo - vga_vram_base; + } else + c->vc_origin += delta; + scr_memsetw((u16 *) (c->vc_origin + c->vc_screenbuf_size - + delta), c->vc_video_erase_char, + delta); + } else { + if (oldo - delta < vga_vram_base) { + scr_memmovew((u16 *) (vga_vram_end - + c->vc_screenbuf_size + + delta), (u16 *) oldo, + c->vc_screenbuf_size - delta); + c->vc_origin = vga_vram_end - c->vc_screenbuf_size; + vga_rolled_over = 0; + } else + c->vc_origin -= delta; + c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size; + scr_memsetw((u16 *) (c->vc_origin), c->vc_video_erase_char, + delta); + } + c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size; + c->vc_visible_origin = c->vc_origin; + vga_set_mem_top(c); + c->vc_pos = (c->vc_pos - oldo) + c->vc_origin; + return 1; +} + + +/* + * The console `switch' structure for the VGA based console + */ + +static int vgacon_dummy(struct vc_data *c) +{ + return 0; +} + +#define DUMMY (void *) vgacon_dummy + +const struct consw vga_con = { + .owner = THIS_MODULE, + .con_startup = vgacon_startup, + .con_init = vgacon_init, + .con_deinit = vgacon_deinit, + .con_clear = DUMMY, + .con_putc = DUMMY, + .con_putcs = DUMMY, + .con_cursor = vgacon_cursor, + .con_scroll = vgacon_scroll, + .con_bmove = DUMMY, + .con_switch = vgacon_switch, + .con_blank = vgacon_blank, + .con_font_set = vgacon_font_set, + .con_font_get = vgacon_font_get, + .con_set_palette = vgacon_set_palette, + .con_scrolldelta = vgacon_scrolldelta, + .con_set_origin = vgacon_set_origin, + .con_save_screen = vgacon_save_screen, + .con_build_attr = vgacon_build_attr, + .con_invert_region = vgacon_invert_region, +}; + +MODULE_LICENSE("GPL"); |
