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分类: LINUX

2009-08-10 15:57:57

/*
 * linux/kernel/keyboard.S
 *
 * (C) 1991 Linus Torvalds
 */

/*
 *    Thanks to Alfred Leung for US keyboard patches
 *        Wolfgang Thiel for German keyboard patches
 *        Marc Corsini for the French keyboard
 */

#include <linux/config.h>//内核配置头文件,定义键盘语言和硬盘类型

.text
.globl _keyboard_interrupt

/*
 * these are for the keyboard read functions
 */
size    = 1024/*缓冲区(缓冲队列的长度)与/include/linux/tty.h line 14 #define TTY_BUF_SIZE 1024 相同 must be a power of two ! And MUST be the same
             as in tty_io.c !!!! */
head = 4#/include/linux/tty.h tty_queue结构 缓冲区头指针字段在tty_queue结构的偏移
tail = 8#缓冲区尾指针段偏移
proc_list = 12#等待该缓冲区队列的进程字段偏移
buf = 16#队列的缓冲区字段偏移

mode:    .byte 0        /* caps, alt, ctrl and shift mode */
leds:    .byte 2        /* num-lock, caps, scroll-lock mode (nom-lock on) */
e0:    .byte 0

/*
 * con_int is the real interrupt routine that reads the
 * keyboard scan-code and converts it into the appropriate
 * ascii character(s).
 */
_keyboard_interrupt:#键盘中断处理程序入口点
    pushl %eax
    pushl %ebx
    pushl %ecx
    pushl %edx
    push %ds
    push %es
    movl $0x10,%eax
    mov %ax,%ds
    mov %ax,%es
    xorl %al,%al        /* %eax is scan code */
    inb $0x60,%al
    cmpb $0xe0,%al
    je set_e0
    cmpb $0xe1,%al
    je set_e1
    call key_table(,%eax,4)#调用键处理函数
    movb $0,e0
e0_e1:    inb $0x61,%al
    jmp 1f
1:    jmp 1f
1:    orb $0x80,%al
    jmp 1f
1:    jmp 1f
1:    outb %al,$0x61
    jmp 1f
1:    jmp 1f
1:    andb $0x7F,%al
    outb %al,$0x61
    movb $0x20,%al
    outb %al,$0x20
    pushl $0//控制台tty号为0,作为参数入栈,
    call _do_tty_interrupt//调用do_tty_interrupt C语言函数
    addl $4,%esp//丢弃入栈的参数,弹出保留的寄存器,并中断返回
    pop %es
    pop %ds
    popl %edx
    popl %ecx
    popl %ebx
    popl %eax
    iret
set_e0:    movb $1,e0
    jmp e0_e1
set_e1:    movb $2,e0
    jmp e0_e1

/*
 * This routine fills the buffer with max 8 bytes, taken from
 * %ebx:%eax. (%edx is high). The bytes are written in the
 * order %al,%ah,%eal,%eah,%bl,%bh ... until %eax is zero.
 */
put_queue:
    pushl %ecx
    pushl %edx
    movl _table_list,%edx        # read-queue for console,linux-0.11\kernel\chr_drv\tty_io.c line 99 读控制台的缓冲队列read-queue的进址
    movl head(%edx),%ecx
1:    movb %al,buf(%edx,%ecx)
    incl %ecx
    andl $size-1,%ecx
    cmpl tail(%edx),%ecx        # buffer full - discard everything
    je 3f
    shrdl $8,%ebx,%eax
    je 2f
    shrl $8,%ebx
    jmp 1b
2:    movl %ecx,head(%edx)
    movl proc_list(%edx),%ecx
    testl %ecx,%ecx
    je 3f
    movl $0,(%ecx)
3:    popl %edx
    popl %ecx
    ret

ctrl:    movb $0x04,%al
    jmp 1f
alt:    movb $0x10,%al
1:    cmpb $0,e0
    je 2f
    addb %al,%al
2:    orb %al,mode
    ret
unctrl:    movb $0x04,%al
    jmp 1f
unalt:    movb $0x10,%al
1:    cmpb $0,e0
    je 2f
    addb %al,%al
2:    notb %al
    andb %al,mode
    ret

lshift:
    orb $0x01,mode
    ret
unlshift:
    andb $0xfe,mode
    ret
rshift:
    orb $0x02,mode
    ret
unrshift:
    andb $0xfd,mode
    ret

caps:    testb $0x80,mode
    jne 1f
    xorb $4,leds
    xorb $0x40,mode
    orb $0x80,mode
set_leds:
    call kb_wait
    movb $0xed,%al        /* set leds command */
    outb %al,$0x60
    call kb_wait
    movb leds,%al
    outb %al,$0x60
    ret
uncaps:    andb $0x7f,mode
    ret
scroll:
    xorb $1,leds
    jmp set_leds
num:    xorb $2,leds
    jmp set_leds

/*
 * curosr-key/numeric keypad cursor keys are handled here.
 * checking for numeric keypad etc.
 */
cursor:
    subb $0x47,%al
    jb 1f
    cmpb $12,%al
    ja 1f
    jne cur2        /* check for ctrl-alt-del */
    testb $0x0c,mode
    je cur2
    testb $0x30,mode
    jne reboot
cur2:    cmpb $0x01,e0        /* e0 forces cursor movement */
    je cur
    testb $0x02,leds    /* not num-lock forces cursor */
    je cur
    testb $0x03,mode    /* shift forces cursor */
    jne cur
    xorl %ebx,%ebx
    movb num_table(%eax),%al
    jmp put_queue
1:    ret

cur:    movb cur_table(%eax),%al
    cmpb $'9,%al
    ja ok_cur
    movb $'
~,%ah
ok_cur:    shll $16,%eax
    movw $0x5b1b,%ax
    xorl %ebx,%ebx
    jmp put_queue

#if defined(KBD_FR)
num_table:
    .ascii "789 456 1230."
#else
num_table:
    .ascii "789 456 1230,"
#endif
cur_table:
    .ascii "HA5 DGC YB623"

/*
 * this routine handles function keys
 */
func:
    pushl %eax
    pushl %ecx
    pushl %edx
    call _show_stat//调用显示各任务状态函数(\kernel\sched.c line 37)
    popl %edx
    popl %ecx
    popl %eax
    subb $0x3B,%al
    jb end_func
    cmpb $9,%al
    jbe ok_func
    subb $18,%al
    cmpb $10,%al
    jb end_func
    cmpb $11,%al
    ja end_func
ok_func:
    cmpl $4,%ecx        /* check that there is enough room */
    jl end_func
    movl func_table(,%eax,4),%eax
    xorl %ebx,%ebx
    jmp put_queue
end_func:
    ret

/*
 * function keys send F1:'esc [ [ A' F2:'esc [ [ B' etc.
 */
func_table:
    .long 0x415b5b1b,0x425b5b1b,0x435b5b1b,0x445b5b1b
    .long 0x455b5b1b,0x465b5b1b,0x475b5b1b,0x485b5b1b
    .long 0x495b5b1b,0x4a5b5b1b,0x4b5b5b1b,0x4c5b5b1b

#if    defined(KBD_FINNISH)
key_map:
    .byte 0,27
    .ascii "1234567890+'"
    .byte 127,9
    .ascii "qwertyuiop}"
    .byte 0,13,0
    .ascii "asdfghjkl|{"
    .byte 0,0
    .ascii "'zxcvbnm,.-"
    .byte 0,'*,0,32        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte '
-,0,0,0,'+    /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '
<
    .fill 10,1,0

shift_map:
    .byte 0,27
    .ascii "!\"#$%&/()=?`"
    .byte 127,9
    .ascii "
QWERTYUIOP]^"
    .byte 13,0
    .ascii "
ASDFGHJKL\\["
    .byte 0,0
    .ascii "
*ZXCVBNM;:_"
    .byte 0,'*,0,32        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte '-,0,0,0,'+    /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '>
    .fill 10,1,0

alt_map:
    .byte 0,0
    .ascii "
\0@\0$\0\0{[]}\\\0"
    .byte 0,0
    .byte 0,0,0,0,0,0,0,0,0,0,0
    .byte '~,13,0
    .byte 0,0,0,0,0,0,0,0,0,0,0
    .byte 0,0
    .byte 0,0,0,0,0,0,0,0,0,0,0
    .byte 0,0,0,0        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte 0,0,0,0,0        /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '|
    .fill 10,1,0

#elif defined(KBD_US)

key_map:
    .byte 0,27
    .ascii "
1234567890-="
    .byte 127,9
    .ascii "
qwertyuiop[]"
    .byte 13,0
    .ascii "
asdfghjkl;'"
    .byte '
`,0
    .ascii "\\zxcvbnm,./"
    .byte 0,'*,0,32        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte '
-,0,0,0,'+    /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '
<
    .fill 10,1,0


shift_map:
    .byte 0,27
    .ascii "!@#$%^&*()_+"
    .byte 127,9
    .ascii "QWERTYUIOP{}"
    .byte 13,0
    .ascii "ASDFGHJKL:\""
    .byte '~,0
    .ascii "
|ZXCVBNM<>?"
    .byte 0,'*,0,32        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte '-,0,0,0,'+    /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '>
    .fill 10,1,0

alt_map:
    .byte 0,0
    .ascii "
\0@\0$\0\0{[]}\\\0"
    .byte 0,0
    .byte 0,0,0,0,0,0,0,0,0,0,0
    .byte '~,13,0
    .byte 0,0,0,0,0,0,0,0,0,0,0
    .byte 0,0
    .byte 0,0,0,0,0,0,0,0,0,0,0
    .byte 0,0,0,0        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte 0,0,0,0,0        /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '|
    .fill 10,1,0

#elif defined(KBD_GR)

key_map:
    .byte 0,27
    .ascii "
1234567890\\'"
    .byte 127,9
    .ascii "qwertzuiop@+"
    .byte 13,0
    .ascii "asdfghjkl[]^"
    .byte 0,'
#
    .ascii "yxcvbnm,.-"
    .byte 0,'*,0,32        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte '
-,0,0,0,'+    /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '
<
    .fill 10,1,0


shift_map:
    .byte 0,27
    .ascii "!\"#$%&/()=?`"
    .byte 127,9
    .ascii "
QWERTZUIOP\\*"
    .byte 13,0
    .ascii "
ASDFGHJKL{}~"
    .byte 0,''
    .ascii "
YXCVBNM;:_"
    .byte 0,'*,0,32        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte '-,0,0,0,'+    /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '>
    .fill 10,1,0

alt_map:
    .byte 0,0
    .ascii "
\0@\0$\0\0{[]}\\\0"
    .byte 0,0
    .byte '@,0,0,0,0,0,0,0,0,0,0
    .byte '~,13,0
    .byte 0,0,0,0,0,0,0,0,0,0,0
    .byte 0,0
    .byte 0,0,0,0,0,0,0,0,0,0,0
    .byte 0,0,0,0        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte 0,0,0,0,0        /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '|
    .fill 10,1,0


#elif defined(KBD_FR)

key_map:
    .byte 0,27
    .ascii "
&{\"'(-}_/@)="
    .byte 127,9
    .ascii "azertyuiop^$"
    .byte 13,0
    .ascii "qsdfghjklm|"
    .byte '`,0,42        /* coin sup gauche, don't know, [*|mu] */
    .ascii "wxcvbn,;:!"
    .byte 0,'*,0,32        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte '
-,0,0,0,'+    /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '
<
    .fill 10,1,0

shift_map:
    .byte 0,27
    .ascii "1234567890]+"
    .byte 127,9
    .ascii "AZERTYUIOP<>"
    .byte 13,0
    .ascii "QSDFGHJKLM%"
    .byte '~,0,'#
    .ascii "WXCVBN?./\\"
    .byte 0,'*,0,32        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte '
-,0,0,0,'+    /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '
>
    .fill 10,1,0

alt_map:
    .byte 0,0
    .ascii "\0~#{[|`\\^@]}"
    .byte 0,0
    .byte '@,0,0,0,0,0,0,0,0,0,0
    .byte '
~,13,0
    .byte 0,0,0,0,0,0,0,0,0,0,0
    .byte 0,0
    .byte 0,0,0,0,0,0,0,0,0,0,0
    .byte 0,0,0,0        /* 36-39 */
    .fill 16,1,0        /* 3A-49 */
    .byte 0,0,0,0,0        /* 4A-4E */
    .byte 0,0,0,0,0,0,0    /* 4F-55 */
    .byte '|
    .fill 10,1,0

#else
#error "KBD-type not defined"
#endif
/*
 * do_self handles "normal" keys, ie keys that don'
t change meaning
 * and which have just one character returns.
 */
do_self:
    lea alt_map,%ebx
    testb $0x20,mode        /* alt-gr */
    jne 1f
    lea shift_map,%ebx
    testb $0x03,mode
    jne 1f
    lea key_map,%ebx
1:    movb (%ebx,%eax),%al
    orb %al,%al
    je none
    testb $0x4c,mode        /* ctrl or caps */
    je 2f
    cmpb $'a,%al
    jb 2f
    cmpb $'
},%al
    ja 2f
    subb $32,%al
2:    testb $0x0c,mode        /* ctrl */
    je 3f
    cmpb $64,%al
    jb 3f
    cmpb $64+32,%al
    jae 3f
    subb $64,%al
3:    testb $0x10,mode        /* left alt */
    je 4f
    orb $0x80,%al
4:    andl $0xff,%eax
    xorl %ebx,%ebx
    call put_queue
none:    ret

/*
 * minus has a routine of it's own, as a 'E0h' before
 * the scan code for minus means that the numeric keypad
 * slash was pushed.
 */
minus:    cmpb $1,e0
    jne do_self
    movl $'
/,%eax
    xorl %ebx,%ebx
    jmp put_queue

/*
 * This table decides which routine to call when a scan-code has been
 * gotten. Most routines just call do_self, or none, depending if
 * they are make or break.子程序地址跳转表
 */
key_table:
    .long none,do_self,do_self,do_self    /* 00-03 s0 esc 1 2 */
    .long do_self,do_self,do_self,do_self    /* 04-07 3 4 5 6 */
    .long do_self,do_self,do_self,do_self    /* 08-0B 7 8 9 0 */
    .long do_self,do_self,do_self,do_self    /* 0C-0F + ' bs tab */
    .long do_self,do_self,do_self,do_self    /* 10-13 q w e r */
    .long do_self,do_self,do_self,do_self    /* 14-17 t y u i */
    .long do_self,do_self,do_self,do_self    /* 18-1B o p } ^ */
    .long do_self,ctrl,do_self,do_self    /* 1C-1F enter ctrl a s */
    .long do_self,do_self,do_self,do_self    /* 20-23 d f g h */
    .long do_self,do_self,do_self,do_self    /* 24-27 j k l | */
    .long do_self,do_self,lshift,do_self    /* 28-2B { para lshift , */
    .long do_self,do_self,do_self,do_self    /* 2C-2F z x c v */
    .long do_self,do_self,do_self,do_self    /* 30-33 b n m , */
    .long do_self,minus,rshift,do_self    /* 34-37 . - rshift * */
    .long alt,do_self,caps,func        /* 38-3B alt sp caps f1 */
    .long func,func,func,func        /* 3C-3F f2 f3 f4 f5 */
    .long func,func,func,func        /* 40-43 f6 f7 f8 f9 */
    .long func,num,scroll,cursor        /* 44-47 f10 num scr home */
    .long cursor,cursor,do_self,cursor    /* 48-4B up pgup - left */
    .long cursor,cursor,do_self,cursor    /* 4C-4F n5 right + end */
    .long cursor,cursor,cursor,cursor    /* 50-53 dn pgdn ins del */
    .long none,none,do_self,func        /* 54-57 sysreq ? < f11 */
    .long func,none,none,none        /* 58-5B f12 ? ? ? */
    .long none,none,none,none        /* 5C-5F ? ? ? ? */
    .long none,none,none,none        /* 60-63 ? ? ? ? */
    .long none,none,none,none        /* 64-67 ? ? ? ? */
    .long none,none,none,none        /* 68-6B ? ? ? ? */
    .long none,none,none,none        /* 6C-6F ? ? ? ? */
    .long none,none,none,none        /* 70-73 ? ? ? ? */
    .long none,none,none,none        /* 74-77 ? ? ? ? */
    .long none,none,none,none        /* 78-7B ? ? ? ? */
    .long none,none,none,none        /* 7C-7F ? ? ? ? */
    .long none,none,none,none        /* 80-83 ? br br br */
    .long none,none,none,none        /* 84-87 br br br br */
    .long none,none,none,none        /* 88-8B br br br br */
    .long none,none,none,none        /* 8C-8F br br br br */
    .long none,none,none,none        /* 90-93 br br br br */
    .long none,none,none,none        /* 94-97 br br br br */
    .long none,none,none,none        /* 98-9B br br br br */
    .long none,unctrl,none,none        /* 9C-9F br unctrl br br */
    .long none,none,none,none        /* A0-A3 br br br br */
    .long none,none,none,none        /* A4-A7 br br br br */
    .long none,none,unlshift,none        /* A8-AB br br unlshift br */
    .long none,none,none,none        /* AC-AF br br br br */
    .long none,none,none,none        /* B0-B3 br br br br */
    .long none,none,unrshift,none        /* B4-B7 br br unrshift br */
    .long unalt,none,uncaps,none        /* B8-BB unalt br uncaps br */
    .long none,none,none,none        /* BC-BF br br br br */
    .long none,none,none,none        /* C0-C3 br br br br */
    .long none,none,none,none        /* C4-C7 br br br br */
    .long none,none,none,none        /* C8-CB br br br br */
    .long none,none,none,none        /* CC-CF br br br br */
    .long none,none,none,none        /* D0-D3 br br br br */
    .long none,none,none,none        /* D4-D7 br br br br */
    .long none,none,none,none        /* D8-DB br ? ? ? */
    .long none,none,none,none        /* DC-DF ? ? ? ? */
    .long none,none,none,none        /* E0-E3 e0 e1 ? ? */
    .long none,none,none,none        /* E4-E7 ? ? ? ? */
    .long none,none,none,none        /* E8-EB ? ? ? ? */
    .long none,none,none,none        /* EC-EF ? ? ? ? */
    .long none,none,none,none        /* F0-F3 ? ? ? ? */
    .long none,none,none,none        /* F4-F7 ? ? ? ? */
    .long none,none,none,none        /* F8-FB ? ? ? ? */
    .long none,none,none,none        /* FC-FF ? ? ? ? */

/*
 * kb_wait waits for the keyboard controller buffer to empty.
 * there is no timeout - if the buffer doesn'
t empty, we hang.
 */
kb_wait:
    pushl %eax
1:    inb $0x64,%al
    testb $0x02,%al
    jne 1b
    popl %eax
    ret
/*
 * This routine reboots the machine by asking the keyboard
 * controller to pulse the reset-line low.
 */
reboot:
    call kb_wait
    movw $0x1234,0x472    /* don

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chinaunix网友2009-08-10 16:01:33

处理过程: 1、从键盘按一键,向中断控制器发送一键盘中断请求信号 2、执行键盘中断请求函数 3、 inb $0x60,%al line 48 4、 call key_table(,%eax,4) line 53 5、 key_table:(do_self func) line 502 6、 func: line 210 ------- jmp put_queue line 232 7、 do_self: line 453 ----------- call put_queue line 483 8、put_queue: line 88 ------------- movl _table_list,%edx // # read-queue for console,linux-0.11\kernel\chr_drv\tty_io.c line 99 读控制台的缓冲队列read-queue的进址 #将读取的字符放入控制台的读缓冲队列中

chinaunix网友2009-08-10 16:01:33

处理过程: 1、从键盘按一键,向中断控制器发送一键盘中断请求信号 2、执行键盘中断请求函数 3、 inb $0x60,%al line 48 4、 call key_table(,%eax,4) line 53 5、 key_table:(do_self func) line 502 6、 func: line 210 ------- jmp put_queue line 232 7、 do_self: line 453 ----------- call put_queue line 483 8、put_queue: line 88 ------------- movl _table_list,%edx // # read-queue for console,linux-0.11\kernel\chr_drv\tty_io.c line 99 读控制台的缓冲队列read-queue的进址 #将读取的字符放入控制台的读缓冲队列中