linux0.12源代码

/* * linux/kernel/console.c * * (C) 1991 Linus Torvalds */ /* * console.c * * This module implements the console io functions * 'void con_init(void)' * 'void con_write(struct tty_queue * queue)' * Hopefully this will be a rather complete VT102 implementation. * * Beeping thanks to John T Kohl. * * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics * Chars, and VT100 enhancements by Peter MacDonald. */ /* * NOTE!!! We sometimes disable and enable interrupts for a short while * (to put a word in video IO), but this will work even for keyboard * interrupts. We know interrupts aren't enabled when getting a keyboard * interrupt, as we use trap-gates. Hopefully all is well. */ /* * Code to check for different video-cards mostly by Galen Hunt, * <g-hunt@ee.utah.edu> */ #include <linux/sched.h> #include <linux/tty.h> #include <linux/config.h> #include <linux/kernel.h> #include <asm/io.h> #include <asm/system.h> #include <asm/segment.h> #include <string.h> #include <errno.h> #define DEF_TERMIOS \ (struct termios) { \ ICRNL, \ OPOST | ONLCR, \ 0, \ IXON | ISIG | ICANON | ECHO | ECHOCTL | ECHOKE, \ 0, \ INIT_C_CC \ } /* * These are set up by the setup-routine at boot-time: */ #define ORIG_X (*(unsigned char *)0x90000) #define ORIG_Y (*(unsigned char *)0x90001) #define ORIG_VIDEO_PAGE (*(unsigned short *)0x90004) #define ORIG_VIDEO_MODE ((*(unsigned short *)0x90006) & 0xff) #define ORIG_VIDEO_COLS (((*(unsigned short *)0x90006) & 0xff00) >> 8) #define ORIG_VIDEO_LINES ((*(unsigned short *)0x9000e) & 0xff) #define ORIG_VIDEO_EGA_AX (*(unsigned short *)0x90008) #define ORIG_VIDEO_EGA_BX (*(unsigned short *)0x9000a) #define ORIG_VIDEO_EGA_CX (*(unsigned short *)0x9000c) #define VIDEO_TYPE_MDA 0x10 /* Monochrome Text Display */ #define VIDEO_TYPE_CGA 0x11 /* CGA Display */ #define VIDEO_TYPE_EGAM 0x20 /* EGA/VGA in Monochrome Mode */ #define VIDEO_TYPE_EGAC 0x21 /* EGA/VGA in Color Mode */ #define NPAR 16 int NR_CONSOLES = 0; extern void keyboard_interrupt(void); static unsigned char video_type; /* Type of display being used */ static unsigned long video_num_columns; /* Number of text columns */ static unsigned long video_mem_base; /* Base of video memory */ static unsigned long video_mem_term; /* End of video memory */ static unsigned long video_size_row; /* Bytes per row */ static unsigned long video_num_lines; /* Number of test lines */ static unsigned char video_page; /* Initial video page */ static unsigned short video_port_reg; /* Video register select port */ static unsigned short video_port_val; /* Video register value port */ static int can_do_colour = 0; static struct { unsigned short vc_video_erase_char; unsigned char vc_attr; unsigned char vc_def_attr; int vc_bold_attr; unsigned long vc_ques; unsigned long vc_state; unsigned long vc_restate; unsigned long vc_checkin; unsigned long vc_origin; /* Used for EGA/VGA fast scroll */ unsigned long vc_scr_end; /* Used for EGA/VGA fast scroll */ unsigned long vc_pos; unsigned long vc_x,vc_y; unsigned long vc_top,vc_bottom; unsigned long vc_npar,vc_par[NPAR]; unsigned long vc_video_mem_start; /* Start of video RAM */ unsigned long vc_video_mem_end; /* End of video RAM (sort of) */ unsigned int vc_saved_x; unsigned int vc_saved_y; unsigned int vc_iscolor; char * vc_translate; } vc_cons [MAX_CONSOLES]; #define origin (vc_cons[currcons].vc_origin) #define scr_end (vc_cons[currcons].vc_scr_end) #define pos (vc_cons[currcons].vc_pos) #define top (vc_cons[currcons].vc_top) #define bottom (vc_cons[currcons].vc_bottom) #define x (vc_cons[currcons].vc_x) #define y (vc_cons[currcons].vc_y) #define state (vc_cons[currcons].vc_state) #define restate (vc_cons[currcons].vc_restate) #define checkin (vc_cons[currcons].vc_checkin) #define npar (vc_cons[currcons].vc_npar) #define par (vc_cons[currcons].vc_par) #define ques (vc_cons[currcons].vc_ques) #define attr (vc_cons[currcons].vc_attr) #define saved_x (vc_cons[currcons].vc_saved_x) #define saved_y (vc_cons[currcons].vc_saved_y) #define translate (vc_cons[currcons].vc_translate) #define video_mem_start (vc_cons[currcons].vc_video_mem_start) #define video_mem_end (vc_cons[currcons].vc_video_mem_end) #define def_attr (vc_cons[currcons].vc_def_attr) #define video_erase_char (vc_cons[currcons].vc_video_erase_char) #define iscolor (vc_cons[currcons].vc_iscolor) int blankinterval = 0; int blankcount = 0; static void sysbeep(void); /* * this is what the terminal answers to a ESC-Z or csi0c * query (= vt100 response). */ #define RESPONSE "\033[?1;2c" static char * translations[] = { /* normal 7-bit ascii */ " !\"#$%&'()*+,-./0123456789:;<=>?" "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_" "`abcdefghijklmnopqrstuvwxyz{|}~ ", /* vt100 graphics */ " !\"#$%&'()*+,-./0123456789:;<=>?" "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^ " "\004\261\007\007\007\007\370\361\007\007\275\267\326\323\327\304" "\304\304\304\304\307\266\320\322\272\363\362\343\\007\234\007 " }; #define NORM_TRANS (translations[0]) #define GRAF_TRANS (translations[1]) /* NOTE! gotoxy thinks x==video_num_columns is ok */ static inline void gotoxy(int currcons, int new_x,unsigned int new_y) { if (new_x > video_num_columns || new_y >= video_num_lines) return; x = new_x; y = new_y; pos = origin + y*video_size_row + (x<<1); } static inline void set_origin(int currcons) { if (video_type != VIDEO_TYPE_EGAC && video_type != VIDEO_TYPE_EGAM) return; if (currcons != fg_console) return; cli(); outb_p(12, video_port_reg); outb_p(0xff&((origin-video_mem_base)>>9), video_port_val); outb_p(13, video_port_reg); outb_p(0xff&((origin-video_mem_base)>>1), video_port_val); sti(); } static void scrup(int currcons) { if (bottom<=top) return; if (video_type == VIDEO_TYPE_EGAC || video_type == VIDEO_TYPE_EGAM) { if (!top && bottom == video_num_lines) { origin += video_size_row; pos += video_size_row; scr_end += video_size_row; if (scr_end > video_mem_end) { __asm__("cld\n\t" "rep\n\t" "movsl\n\t" "movl _video_num_columns,%1\n\t" "rep\n\t" "stosw" ::"a" (video_erase_char), "c" ((video_num_lines-1)*video_num_columns>>1), "D" (video_mem_start), "S" (origin) :"cx","di","si"); scr_end -= origin-video_mem_start; pos -= origin-video_mem_start; origin = video_mem_start; } else { __asm__("cld\n\t" "rep\n\t" "stosw" ::"a" (video_erase_char), "c" (video_num_columns), "D" (scr_end-video_size_row) :"cx","di"); } set_origin(currcons); } else { __asm__("cld\n\t" "rep\n\t" "movsl\n\t" "movl _video_num_columns,%%ecx\n\t" "rep\n\t" "stosw" ::"a" (video_erase_char), "c" ((bottom-top-1)*video_num_columns>>1), "D" (origin+video_size_row*top), "S" (origin+video_size_row*(top+1)) :"cx","di","si"); } } else /* Not EGA/VGA */ { __asm__("cld\n\t" "rep\n\t" "movsl\n\t" "movl _video_num_columns,%%ecx\n\t" "rep\n\t" "stosw" ::"a" (video_erase_char), "c" ((bottom-top-1)*video_num_columns>>1), "D" (origin+video_size_row*top), "S" (origin+video_size_row*(top+1)) :"cx","di","si"); } } static void scrdown(int currcons) { if (bottom <= top) return; if (video_type == VIDEO_TYPE_EGAC || video_type == VIDEO_TYPE_EGAM) { __asm__("std\n\t" "rep\n\t" "movsl\n\t" "addl $2,%%edi\n\t" /* %edi has been decremented by 4 */ "movl _video_num_columns,%%ecx\n\t" "rep\n\t" "stosw" ::"a" (video_erase_char), "c" ((bottom-top-1)*video_num_columns>>1), "D" (origin+video_size_row*bottom-4), "S" (origin+video_size_row*(bottom-1)-4) :"ax","cx","di","si"); } else /* Not EGA/VGA */ { __asm__("std\n\t" "rep\n\t" "movsl\n\t" "addl $2,%%edi\n\t" /* %edi has been decremented by 4 */ "movl _video_num_columns,%%ecx\n\t" "rep\n\t" "stosw" ::"a" (video_erase_char), "c" ((bottom-top