diff options
Diffstat (limited to 'linux/kernel/keyboard.s')
| -rw-r--r-- | linux/kernel/keyboard.s | 409 |
1 files changed, 409 insertions, 0 deletions
diff --git a/linux/kernel/keyboard.s b/linux/kernel/keyboard.s new file mode 100644 index 0000000..ba54be5 --- /dev/null +++ b/linux/kernel/keyboard.s @@ -0,0 +1,409 @@ +/* + * keyboard.s + */ + +.text +.globl _keyboard_interrupt + +/* + * these are for the keyboard read functions + */ +size = 1024 /* must be a power of two ! And MUST be the same + as in tty_io.c !!!! */ +head = 4 +tail = 8 +proc_list = 12 +buf = 16 + +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: + 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) + 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 + call _do_tty_interrupt + addl $4,%esp + 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 + 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 + +num_table: + .ascii "789 456 1230," +cur_table: + .ascii "HA5 DGC YB623" + +/* + * this routine handles function keys + */ +func: + 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 $4,%ecx /* check that there is enough room */ + jl end_func + movl func_table(,%eax,4),%eax + xorl %ebx,%ebx + jmp put_queue +end_func: + ret + +/* + * function keys send F1:'esc [ [ A' F2:'esc [ [ B' etc. + */ +func_table: + .long 0x415b5b1b,0x425b5b1b,0x435b5b1b,0x445b5b1b + .long 0x455b5b1b,0x465b5b1b,0x475b5b1b,0x485b5b1b + .long 0x495b5b1b,0x4a5b5b1b,0x4b5b5b1b,0x4c5b5b1b + +key_map: + .byte 0,27 + .ascii "1234567890+'" + .byte 127,9 + .ascii "qwertyuiop}" + .byte 0,10,0 + .ascii "asdfghjkl|{" + .byte 0,0 + .ascii "'zxcvbnm,.-" + .byte 0,'*,0,32 /* 36-39 */ + .fill 16,1,0 /* 3A-49 */ + .byte '-,0,0,0,'+ /* 4A-4E */ + .byte 0,0,0,0,0,0,0 /* 4F-55 */ + .byte '< + .fill 10,1,0 + +shift_map: + .byte 0,27 + .ascii "!\"#$%&/()=?`" + .byte 127,9 + .ascii "QWERTYUIOP]^" + .byte 10,0 + .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 '~,10,0 + .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 + +/* + * 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 $'z,%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. + */ +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't do memory check */ + movb $0xfc,%al /* pulse reset and A20 low */ + outb %al,$0x64 +die: jmp die |