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robfinch |
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; ============================================================================
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; __
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; \\__/ o\ (C) 2015 Robert Finch, Stratford
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; \ __ / All rights reserved.
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; \/_// robfinch@finitron.ca
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; ||
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;
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;
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; This source file is free software: you can redistribute it and/or modify
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; it under the terms of the GNU Lesser General Public License as published
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; by the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This source file is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see .
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;
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;
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; KeyState1_
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; 76543210
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; + = keyup
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;
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; KeyState2_
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; 76543210
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; |||||||+ = shift
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; ||||||+- = alt
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; |||||+-- = control
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; ||||+--- = numlock
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; |||+---- = capslock
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; ||+----- = scrolllock
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; |+------ =
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; +------- = extended
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;
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; ============================================================================
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;
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; Static Device Control Block for Keyboard
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;
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align 8
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byte 8,"keyboard " ; DCB_Name string: first byte is length, 11 chars max
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dh 0 ; DCB_Type 0 = character
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dw 0 ; DCB_nBPB
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dw 0 ; DCB_LastErc last error code
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dw 0 ; DCB_StartBlock starting block number (partitioned devices)
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dw 0 ; DCB_nBlocks number of blocks on device
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dw KeybdCmdProc ; DCB_pCmdProc pointer to command processor routine
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byte 1 ; DCB_ReentCount re-entrancy count (1 to 255)
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byte 0 ; DCB_fSingleUser
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fill.b 6,0
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dw 0 ; DCB_hJob handle to associated job
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dw 0 ; DCB_Mbx
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dw 0 ; DCB_pSema pointer to device semaphore
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dw 0 ; DCB_Resv1 reserved
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dw 0 ; DCB_Resv2 reserved
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align 8
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kbd_jmp:
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jmp KeybdIRQ[c0]
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KeybdCmdProc:
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rts
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KeybdInit:
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addui sp,sp,#-8
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sws c1,[sp]
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lla r1,cs:kbd_jmp ; set interrupt vector
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ldi r2,#194
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bsr set_vector
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lws c1,[sp]
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addui sp,sp,#8
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KeybdClearBuf:
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lw r29,zs:RunningJCB_
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sb r0,zs:JCB_KeybdHead[r29] ; clear buffer pointers
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sb r0,zs:JCB_KeybdTail[r29]
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sb r0,zs:JCB_KeyState1[r29]
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sb r0,zs:JCB_KeyState2[r29]
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sb r0,zs:JCB_KeybdLEDs[r29]
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ldi r1,#64
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sb r1,zs:JCB_KeybdBufSz[r29]
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rts
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; Check if a key is available
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; Returns:
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; r1 = non-zero if key is available, otherwise zero
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;
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public KeybdCheckForKey
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addui sp,sp,#-8
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sw r2,[sp]
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lw r2,zs:RunningJCB_
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lcu r1,zs:JCB_KeybdHead[r2]
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shrui r2,r1,#8
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zxb r1,r1
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eor r1,r1,r2
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lw r2,[sp]
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addui sp,sp,#8
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rts
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endpublic
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public KeybdGetCharWait:
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ldi r1,#-1
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lw r29,zs:RunningJCB_
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sb r1,zs:JCB_KeybdWaitFlag[r29]
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br KeybdGetChar
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endpublic
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public KeybdGetCharNoWait:
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lw r1,zs:RunningJCB_
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sb r0,zs:JCB_KeybdWaitFlag[r1]
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br KeybdGetChar
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endpublic
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; Wait for a keyboard character to be available
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; Returns (-1) if no key available
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; Return key >= 0 if key is available
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;
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;
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KeybdGetChar:
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KeybdGetChar1:
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addui sp,sp,#-64
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sw r2,[sp]
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sws c1,8[sp] ; save off link register
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sws hs,16[sp]
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sws hs.lmt,24[sp]
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sw r3,32[sp]
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sws ds,40[sp]
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sws ds.lmt,48[sp]
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ldis hs,#$FFD00000
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ldis hs.lmt,#$100000
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lws ds,zs:RunningJCB_
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ldis ds.lmt,#$10000
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.0002:
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.0003:
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; Allow for some interruptible code to occur
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nop nop nop nop
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nop nop nop nop
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nop nop nop nop
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; Get head and tail pointers as a single load
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; then separate
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; sei
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sync
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lcu r1,JCB_KeybdHead ; 1 memory op instead of 2
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shrui r2,r1,#8 ; r2 = tail index
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zxb r1,r1 ; r1 = head index
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cmp p0,r1,r2 ; is there anything in the buffer ?
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p0.ne br .0006 ; yes, branch
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cli
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lb r1,JCB_KeybdWaitFlag ; are we waiting indefinitely for a key ?
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tst p0,r1
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p0.lt br .0003 ; if yes, branch
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br .0008 ; otherwise exit no key available
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.0006:
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ldi r1,#$300
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sc r1,hs:LEDS
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lbu r1,JCB_KeybdBuf[r2] ; get scan code from buffer
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lbu r3,JCB_KeybdBufSz
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addui r2,r2,#1 ; increment tail index
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cmp p0,r2,r3
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p0.geu mov r2,r0 ; take modulus
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sb r2,JCB_KeybdTail ; and store it back
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cli
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.0001:
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cmp p0,r1,#SC_KEYUP ; keyup scan code ?
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p0.eq br .doKeyup
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cmp p0,r1,#SC_EXTEND; extended scan code ?
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p0.eq br .doExtend
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cmp p0,r1,#$14 ; control ?
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p0.eq br .doCtrl
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cmp p0,r1,#$12 ; left shift
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p0.eq br .doShift
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cmp p0,r1,#$59 ; right shift
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p0.eq br .doShift
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cmp p0,r1,#SC_NUMLOCK
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p0.eq br .doNumLock
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cmp p0,r1,#SC_CAPSLOCK
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p0.eq br .doCapsLock
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cmp p0,r1,#SC_SCROLLLOCK
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p0.eq br .doScrollLock
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cmp p0,r1,#SC_ALT
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p0.eq br .doAlt
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lb r2,JCB_KeyState1
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sb r0,JCB_KeyState1
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biti p0,r2,#1 ; was keyup set ?
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p0.ne br .0003 ; if yes, ignore and branch back
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lb r2,JCB_KeyState2 ; Is extended code ?
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biti p0,r2,#$80
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p0.eq br .0010
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lb r2,JCB_KeyState2 ; clear extended bit
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andi r2,r2,#$7F
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sb r2,JCB_KeyState2
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sb r0,JCB_KeyState1 ; clear keyup
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andi r1,r1,#$7F
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lbu r1,cs:keybdExtendedCodes_[r1]
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br .0008
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.0010:
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biti p0,r2,#4 ; Is Cntrl down ?
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p0.eq br .0009
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andi r1,r1,#$7F
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lbu r1,cs:keybdControlCodes_[r1]
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br .0008
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.0009:
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biti p0,r2,#33 ; Is shift or CAPS-Lock down ?
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p0.ne lbu r1,cs:shiftedScanCodes_[r1]
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p0.eq lbu r1,cs:unshiftedScanCodes_[r1]
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.0008:
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lw r2,[sp]
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lws c1,8[sp]
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lws hs,16[sp]
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lws hs.lmt,24[sp]
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lw r3,32[sp]
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lws ds,40[sp]
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lws ds.lmt,48[sp]
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addui sp,sp,#64
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rts
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.doKeyup:
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lb r2,JCB_KeyState1 ; set keyup flag
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ori r2,r2,#1
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sb r2,JCB_KeyState1
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br .0003
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.doExtend:
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lb r2,JCB_KeyState2
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ori r2,r2,#$80
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sb r2,JCB_KeyState2
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br .0003
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.doCtrl:
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lb r2,JCB_KeyState1
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biti p0,r2,#1
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lbu r2,JCB_KeyState2
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p0.eq ori r2,r2,#4
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p0.ne andi r2,r2,#~4
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sb r2,JCB_KeyState2
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br .0003
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.doAlt:
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lb r2,JCB_KeyState1
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biti p0,r2,#1
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lbu r2,JCB_KeyState2
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p0.eq ori r2,r2,#2
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p0.ne andi r2,r2,#~2
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sb r2,JCB_KeyState2
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br .0003
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.doShift:
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lb r2,JCB_KeyState1
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biti p0,r2,#1
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lbu r2,JCB_KeyState2
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p0.eq ori r2,r2,#1
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p0.ne andi r2,r2,#~1
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sb r2,JCB_KeyState2
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br .0003
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.doNumLock:
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lbu r2,JCB_KeyState2
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eori r2,r2,#16
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sb r2,JCB_KeyState2
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bsr KeybdSetLEDStatus
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br .0003
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.doCapsLock:
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lbu r2,JCB_KeyState2
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eori r2,r2,#32
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sb r2,JCB_KeyState2
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bsr KeybdSetLEDStatus
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br .0003
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.doScrollLock:
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lbu r2,JCB_KeyState2
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eori r2,r2,#64
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sb r2,JCB_KeyState2
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bsr KeybdSetLEDStatus
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br .0003
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;------------------------------------------------------------------------------
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; Set the keyboard LED status leds.
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; Trashes r1, p0
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;------------------------------------------------------------------------------
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KeybdSetLEDStatus:
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addui r27,r27,#-8
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sws c1,[r27]
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sb r0,KeybdLEDs
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lb r1,JCB_KeyState2
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biti p0,r1,#16
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p0.ne lb r1,KeybdLEDs ; set bit 1 for Num lock, 0 for scrolllock , 2 for caps lock
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| 285 |
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p0.ne ori r1,r1,#2
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| 286 |
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p0.ne sb r1,KeybdLEDs
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| 287 |
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lb r1,JCB_KeyState2
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biti p0,r1,#32
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p0.ne lb r1,KeybdLEDs
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p0.ne ori r1,r1,#4
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p0.ne sb r1,KeybdLEDs
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| 292 |
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lb r1,JCB_KeyState2
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biti p0,r1,#64
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p0.ne lb r1,KeybdLEDs
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| 295 |
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p0.ne ori r1,r1,#1
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| 296 |
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p0.ne sb r1,KeybdLEDs
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ldi r1,#$ED
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| 298 |
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sb r1,hs:KEYBD ; set status LEDs command
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| 299 |
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bsr KeybdWaitTx
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bsr KeybdRecvByte
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| 301 |
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cmpi p0,r1,#$FA
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| 302 |
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lb r1,KeybdLEDs
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sb r1,hs:KEYBD
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| 304 |
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bsr KeybdWaitTx
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| 305 |
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bsr KeybdRecvByte
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| 306 |
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lws c1,[r27]
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addui r27,r27,#8
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| 308 |
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rts
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| 309 |
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| 310 |
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;------------------------------------------------------------------------------
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| 311 |
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; Receive a byte from the keyboard, used after a command is sent to the
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| 312 |
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; keyboard in order to wait for a response.
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| 313 |
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;
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| 314 |
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; Returns:
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| 315 |
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; r1 >= 0 if a scancode is available
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| 316 |
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; r1 = -1 on timeout
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| 317 |
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;------------------------------------------------------------------------------
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| 318 |
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;
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| 319 |
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KeybdRecvByte:
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| 320 |
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addui r27,r27,#-16
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sws c1,8[r27]
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| 322 |
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sw r3,[r27]
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| 323 |
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ldi r3,#20 ; wait up to .2s
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| 324 |
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.0003:
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| 325 |
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bsr KeybdWaitBusy
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| 326 |
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lb r1,hs:KEYBD+1 ; wait for response from keyboard
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| 327 |
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biti p0,r1,#$80 ; is input buffer full ?
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| 328 |
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p0.ne br .0004 ; yes, branch
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| 329 |
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bsr Wait10ms ; wait a bit
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| 330 |
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addui r3,r3,#-1
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| 331 |
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tst p0,r3
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| 332 |
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p0.ne br .0003 ; go back and try again
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| 333 |
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lw r3,[r27] ; timeout
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| 334 |
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lws c1,8[r27]
|
| 335 |
|
|
addui r27,r27,#16
|
| 336 |
|
|
ldi r1,#-1
|
| 337 |
|
|
rts
|
| 338 |
|
|
.0004:
|
| 339 |
|
|
lvb r1,hs:KEYBD ; get scancode
|
| 340 |
|
|
zxb r1,r1 ; convert to unsigned char
|
| 341 |
|
|
sb r0,hs:KEYBD+1 ; clear recieve state
|
| 342 |
|
|
lw r3,[r27]
|
| 343 |
|
|
lws c1,8[r27]
|
| 344 |
|
|
addui r27,r27,#16
|
| 345 |
|
|
rts ; return char in r1
|
| 346 |
|
|
|
| 347 |
|
|
;------------------------------------------------------------------------------
|
| 348 |
|
|
; Wait until the keyboard isn't busy anymore
|
| 349 |
|
|
; Wait until the keyboard transmit is complete
|
| 350 |
|
|
; Returns:
|
| 351 |
|
|
; r1 >= 0 if successful
|
| 352 |
|
|
; r1 < 0 if timed out
|
| 353 |
|
|
;------------------------------------------------------------------------------
|
| 354 |
|
|
;
|
| 355 |
|
|
KeybdWaitBusy: ; alias for KeybdWaitTx
|
| 356 |
|
|
KeybdWaitTx:
|
| 357 |
|
|
addui r27,r27,#-16
|
| 358 |
|
|
sws c1,8[r27]
|
| 359 |
|
|
sw r3,[r27]
|
| 360 |
|
|
ldi r3,#10 ; wait a max of .1s
|
| 361 |
|
|
.0001:
|
| 362 |
|
|
lvb r1,hs:KEYBD+1
|
| 363 |
|
|
biti p0,r1,#$40 ; check for transmit busy bit
|
| 364 |
|
|
p0.eq br .0002 ; branch if bit clear
|
| 365 |
|
|
bsr Wait10ms ; delay a little bit
|
| 366 |
|
|
addui r3,r3,#-1 ; go back and try again
|
| 367 |
|
|
tst p0,r3
|
| 368 |
|
|
p0.ne br .0001
|
| 369 |
|
|
lw r3,[r27] ; timed out
|
| 370 |
|
|
lws c1,8[r27]
|
| 371 |
|
|
addui r27,r27,#16
|
| 372 |
|
|
ldi r1,#-1 ; return -1
|
| 373 |
|
|
rts
|
| 374 |
|
|
.0002:
|
| 375 |
|
|
lw r3,[r27] ; wait complete, return
|
| 376 |
|
|
lws c1,8[r27] ; restore return address
|
| 377 |
|
|
ldi r1,#0 ; return 0 for okay
|
| 378 |
|
|
addui r27,r27,#16
|
| 379 |
|
|
rts
|
| 380 |
|
|
|
| 381 |
|
|
;------------------------------------------------------------------------------
|
| 382 |
|
|
; Delay for about 10 ms.
|
| 383 |
|
|
;------------------------------------------------------------------------------
|
| 384 |
|
|
|
| 385 |
|
|
Wait10ms:
|
| 386 |
|
|
addui r27,r27,#-16
|
| 387 |
|
|
sw r1,8[r27]
|
| 388 |
|
|
sw r2,[r27]
|
| 389 |
|
|
mfspr r1,tick
|
| 390 |
|
|
addui r1,r1,#250000 ; 10ms at 25 MHz
|
| 391 |
|
|
.0001:
|
| 392 |
|
|
mfspr r2,tick
|
| 393 |
|
|
cmp p0,r2,r1
|
| 394 |
|
|
p0.lt br .0001
|
| 395 |
|
|
lw r2,[r27]
|
| 396 |
|
|
lw r1,8[r27]
|
| 397 |
|
|
addui r27,r27,#16
|
| 398 |
|
|
rts
|
| 399 |
|
|
|
| 400 |
|
|
;------------------------------------------------------------------------------
|
| 401 |
|
|
; KeybdIRQ:
|
| 402 |
|
|
; Store scancode in keyboard buffer. Also check for the special key
|
| 403 |
|
|
; sequences ALT-tab and CTRL-ALT-del. If the keyboard buffer is full then
|
| 404 |
|
|
; the newest keystrokes are lost.
|
| 405 |
|
|
;------------------------------------------------------------------------------
|
| 406 |
|
|
|
| 407 |
|
|
KeybdIRQ:
|
| 408 |
|
|
sync
|
| 409 |
|
|
addui r31,r31,#-80
|
| 410 |
|
|
sws p0,[r31]
|
| 411 |
|
|
sw r1,8[r31]
|
| 412 |
|
|
sw r2,16[r31]
|
| 413 |
|
|
sws hs,24[r32]
|
| 414 |
|
|
sw r3,32[r31]
|
| 415 |
|
|
sws ds,40[r31]
|
| 416 |
|
|
sws ds.lmt,48[r31]
|
| 417 |
|
|
sws hs.lmt,56[r31]
|
| 418 |
|
|
sw r4,64[r31]
|
| 419 |
|
|
sw r5,72[r31]
|
| 420 |
|
|
|
| 421 |
|
|
ldis hs,#$FFD00000
|
| 422 |
|
|
ldis hs.lmt,#$100000
|
| 423 |
|
|
lws ds,zs:IOFocusNdx_ ; set input to correct keyboard buffer
|
| 424 |
|
|
ldis ds.lmt,#$10000
|
| 425 |
|
|
lvb r1,hs:KEYBD ; get the scan code
|
| 426 |
|
|
sb r0,hs:KEYBD+1 ; clear interrupt status
|
| 427 |
|
|
lcu r2,JCB_KeybdHead ; get head/tail index (1 memory op)
|
| 428 |
|
|
shrui r3,r2,#8 ; r3 = tail
|
| 429 |
|
|
zxb r2,r2 ; r2 = head
|
| 430 |
|
|
mov r4,r2 ; make copy of old head index
|
| 431 |
|
|
addui r2,r2,#1 ; increment head index
|
| 432 |
|
|
lbu r5,JCB_KeybdBufSz
|
| 433 |
|
|
cmp p0,r2,r5
|
| 434 |
|
|
p0.geu mov r2,r0 ; modulus buffer size
|
| 435 |
|
|
cmp p0,r2,r3 ; is there room in buffer ?
|
| 436 |
|
|
p0.ne sb r1,JCB_KeybdBuf[r4] ; store scan code in buffer
|
| 437 |
|
|
p0.ne sb r2,JCB_KeybdHead ; save buffer index
|
| 438 |
|
|
lb r2,JCB_KeyState2 ; check for ALT
|
| 439 |
|
|
biti p0,r2,#2
|
| 440 |
|
|
p0.eq br .exit
|
| 441 |
|
|
cmpi p0,r1,#SC_TAB
|
| 442 |
|
|
p0.eq inc.b zs:iof_switch_ ; set IOF switch flag if ALT-Tab pressed.
|
| 443 |
|
|
p0.eq br .exit
|
| 444 |
|
|
cmpi p0,r1,#SC_DEL
|
| 445 |
|
|
p0.ne br .exit
|
| 446 |
|
|
biti p0,r2,#4 ; check for CTRL-ALT-DEL
|
| 447 |
|
|
p0.ne jmp cold_start
|
| 448 |
|
|
.exit:
|
| 449 |
|
|
lws p0,[r31]
|
| 450 |
|
|
lw r1,8[r31]
|
| 451 |
|
|
lw r2,16[r31]
|
| 452 |
|
|
lws hs,24[r32]
|
| 453 |
|
|
lw r3,32[r31]
|
| 454 |
|
|
lws ds,40[r31]
|
| 455 |
|
|
lws ds.lmt,48[r31]
|
| 456 |
|
|
lws hs.lmt,56[r31]
|
| 457 |
|
|
lw r4,64[r31]
|
| 458 |
|
|
lw r5,72[r31]
|
| 459 |
|
|
addui r31,r31,#80
|
| 460 |
|
|
sync
|
| 461 |
|
|
rti
|
