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/*
* 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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