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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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;
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SCRSZ EQU 4096
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CR EQU 0x0D ;ASCII equates
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LF EQU 0x0A
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TAB EQU 0x09
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CTRLC EQU 0x03
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BS EQU 0x07
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CTRLH EQU 0x08
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CTRLI EQU 0x09
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CTRLJ EQU 0x0A
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CTRLK EQU 0x0B
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CTRLM EQU 0x0D
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CTRLS EQU 0x13
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CTRLX EQU 0x18
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XON EQU 0x11
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XOFF EQU 0x13
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ESC EQU 0x1B
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SC_LSHIFT EQU $12
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SC_RSHIFT EQU $59
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SC_KEYUP EQU $F0
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SC_EXTEND EQU $E0
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SC_CTRL EQU $14
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SC_ALT EQU $11
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SC_DEL EQU $71 ; extend
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SC_LCTRL EQU $58
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SC_NUMLOCK EQU $77
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SC_SCROLLLOCK EQU $7E
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SC_CAPSLOCK EQU $58
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IOBASE_ADDR EQU 0xFFD00000
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IOLMT EQU 0x100000
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LEDS EQU 0xC0600
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TEXTSCR EQU 0x00000
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TEXTSCR2 EQU 0x10000
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TEXTREG EQU 0xA0000
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TEXT_COLS EQU 0x0
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TEXT_ROWS EQU 0x2
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TEXT_CURPOS EQU 0x16
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KEYBD EQU 0xC0000
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PIC_IE EQU 0xC0FC8
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PIC_ES EQU 0xC0FE0
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PIC_ESR EQU 0xC0FE8 ; edge sense reset
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KeyState1 EQU $2008
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KeyState2 EQU $2009
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KeybdLEDs EQU $200A
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KeybdWaitFlag EQU $200B
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CursorX EQU $2030
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CursorY EQU $2032
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VideoPos EQU $2034
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NormAttr EQU $2036
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Vidregs EQU $2040
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Vidptr EQU $2044
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EscState EQU $2048
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Textrows EQU $204A
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Textcols EQU $204C
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code
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org $FFFF8000
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cold_start:
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; Initialize segment registers for flat model
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mtspr cs,r0
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ldis cs.lmt,#-1 ; maximum
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mtspr zs,r0
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ldis zs.lmt,#-1
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mtspr ds,r0
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ldis ds.lmt,#-1
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mtspr es,r0
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ldis es.lmt,#-1
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mtspr fs,r0
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ldis fs.lmt,#-1
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mtspr gs,r0
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ldis gs.lmt,#-1
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ldis hs,#IOBASE_ADDR
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ldis hs.lmt,#IOLMT
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; set SS:SP
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mtspr ss,r0
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ldis ss.lmt,#$4000
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ldi r27,#$03ff8 ; initialize SP
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; switch processor to full speed
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stp #$FFFF
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; set interrupt table at $0000
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ldis c12,#0
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; set all vectors to the uninitialized interrupt vector
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mov r4,r0
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ldis lc,#255 ; 256 vectors to set
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su1:
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ldi r1,#uii_jmp
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mov r2,r4
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bsr set_vector ; trashes r2,r3
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addui r4,r4,#1
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loop su1
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; setup break vector
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ldi r1,#brk_jmp
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ldi r2,#0
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bsr set_vector
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; setup NMI vector
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ldi r1,#nmi_jmp
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ldi r2,#254
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bsr set_vector
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; setup IRQ vector
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ldi r1,#tms_jmp
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ldi r2,#194
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bsr set_vector
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; Initialize PIC
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ldi r1,#%00100 ; time slice interrupt is edge sensitive
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sh r1,hs:PIC_ES
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ldi r1,#%00101 ; enable time slice interrupt, nmi
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sh r1,hs:PIC_IE
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mov r1,r0
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mov r2,r0
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mov r3,r0
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mov r4,r0
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mov r5,r0
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ldi r1,#1
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sc r1,$FFDC0600
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tlbwrreg DMA,r0 ; clear TLB miss registers
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tlbwrreg IMA,r0
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ldi r1,#2 ; 2 wired registers
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tlbwrreg Wired,r1
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ldi r1,#$2 ; 64kiB page size
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tlbwrreg PageSize,r1
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; setup the first translation
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; virtual page $FFFF0000 maps to physical page $FFFF0000
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; This places the BIOS ROM at $FFFFxxxx in the memory map
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ldi r1,#$80000101 ; ASID=zero, G=1,valid=1
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tlbwrreg ASID,r1
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ldi r1,#$0FFFF
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tlbwrreg VirtPage,r1
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tlbwrreg PhysPage,r1
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tlbwrreg Index,r0 ; select way #0
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tlbwi ; write to TLB entry group #0 with hold registers
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; setup second translation
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; virtual page 0 maps to physical page 0
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ldi r1,#$80000101 ; ASID=zero, G=1,valid=1
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tlbwrreg ASID,r1
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tlbwrreg VirtPage,r0
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tlbwrreg PhysPage,r0
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ldi r1,#8 ; select way#1
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tlbwrreg Index,r1
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tlbwi ; write to TLB entry group #0 with hold registers
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; turn on the TLB
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; tlben
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; enable maskable interrupts
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; Interrupts also are not enabled until an RTI instruction is executed.
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; there will likely be a timer interrupt outstanding so this
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; should go to the timer IRQ.
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cli
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; now globally enable interrupts using the RTI instruction, this will also
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; switch to core to application/user mode.
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ldis c14,#j1 ; c14 contains RTI return address
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rti
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j1:
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ldi r1,#2
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sc r1,$FFDC0600
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; ldi r1,#$AAAAAAAA
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; sh r1,10
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; mov r1,r0
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; lh r1,10
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; cmpi p0,r1,#$AAAAAAAA
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;p0.ne br bad_ram
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sb r0,EscState
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bsr VideoInit
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bsr ClearScreen
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bsr ClearScreen2
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ldi r1,#3
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sc r1,$FFDC0600
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bsr HomeCursor
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ldi r1,#6
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sc r1,$FFDC0600
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ldi r2,#msgStartup
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bsr DisplayString
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ldi r5,#TEXTSCR
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.0001:
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bsr KeybdGetCharWait
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bsr AsciiToScreen
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or r1,r1,#%000000111_111111111_00_00000000
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sh r1,hs:[r5]
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addui r5,r5,#4
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br .0001
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msgStartup:
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byte "Thor Test System Starting...",CR,LF,0
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bad_ram:
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ldi r1,#'B'
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bsr AsciiToScreen
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ori r1,r1,#%011000000_111111111_00_00000000
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sh r1,hs:TEXTSCR+16
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.bram1: br .bram1
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;------------------------------------------------------------------------------
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; Set interrupt vector
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;
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; Parameters:
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; r1 = address of jump code
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; r2 = vector number to set
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; Trashes: r2,r3
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;------------------------------------------------------------------------------
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set_vector:
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mfspr r3,c12 ; get base address of interrupt table
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_16addu r2,r2,r3
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lh r3,cs:[r1]
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sh r3,zs:[r2]
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lh r3,cs:4[r1]
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sh r3,zs:4[r2]
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lh r3,cs:8[r1]
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sh r3,zs:8[r2]
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lh r3,cs:12[r1]
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sh r3,zs:12[r2]
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rts
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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VideoInit:
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ldi r1,#84
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sc r1,Textcols
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ldi r1,#31
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sc r1,Textrows
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ldi r1,#%011000000_111111111_00_00000000
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sh r1,NormAttr
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ldi r1,#TEXTREG
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sh r1,Vidregs
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ldi r1,#TEXTSCR
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sh r1,Vidptr
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ldi r2,#TC1InitData
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ldis lc,#10 ; initialize loop counter ( one less)
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lhu r3,Vidregs
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.0001:
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lvc r1,cs:[r2]
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; sh r1,hs:[r3]
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addui r2,r2,#2
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addui r3,r3,#4
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loop .0001
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| 282 |
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rts
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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ClearScreen:
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; push c1
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addui r27,r27,#-8
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sws c1,[r27]
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| 291 |
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ldi r1,#' '
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| 292 |
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bsr AsciiToScreen
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| 293 |
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lh r2,NormAttr
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| 294 |
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or r2,r2,r1
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| 295 |
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ldis lc,#SCRSZ-1
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| 296 |
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lh r1,Vidptr
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| 297 |
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.0001:
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| 298 |
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; sh r2,hs:[r1]
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| 299 |
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; addui r1,r1,#4
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| 300 |
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; loop .0001
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| 301 |
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ldi r1,#TEXTSCR
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| 302 |
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sync
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| 303 |
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stsh r2,hs:[r1]
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| 304 |
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; pop c1
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| 305 |
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lws c1,[r27]
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| 306 |
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addui r27,r27,#8
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| 307 |
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rts
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| 308 |
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| 309 |
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ClearScreen2:
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| 310 |
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ldis lc,#SCRSZ-1
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| 311 |
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ldi r2,#' '|%000011000_111111111_00_00000000;
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| 312 |
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ldi r1,#TEXTSCR2
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| 313 |
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sync
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| 314 |
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stsh r2,hs:[r1]
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| 315 |
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rts
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| 316 |
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| 317 |
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;------------------------------------------------------------------------------
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| 318 |
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; Scroll the screen upwards.
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| 319 |
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;------------------------------------------------------------------------------
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| 320 |
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| 321 |
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ScrollUp:
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| 322 |
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ldi r3,#0
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| 323 |
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ldi r2,#4096
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| 324 |
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lh r4,Vidptr
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| 325 |
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.0001:
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| 326 |
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addui r27,r27,#-8
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| 327 |
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sw r2,[r27]
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| 328 |
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lc r1,Textcols
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| 329 |
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add r3,r3,r1
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| 330 |
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lh r1,[r4+r3*4]
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| 331 |
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lw r3,[r27] ; pop r3
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| 332 |
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addui r27,r27,#8
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| 333 |
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sh r1,[r4+r3*4]
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| 334 |
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addui r3,r3,#1
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| 335 |
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addui r2,r2,#-1
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| 336 |
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p0.ne br .0001
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| 337 |
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lc r1,Textrows
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| 338 |
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addui r1,r1,#-1
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| 339 |
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| 340 |
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;------------------------------------------------------------------------------
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| 341 |
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; Blank out a line on the screen.
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| 342 |
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;
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| 343 |
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; Parameters:
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| 344 |
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; r1 = line number to blank
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| 345 |
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; Trashes:
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| 346 |
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; r2,r3,r4
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| 347 |
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;------------------------------------------------------------------------------
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| 348 |
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| 349 |
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BlankLine:
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| 350 |
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shli r1,r1,#1
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| 351 |
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lc r3,cs:LineTbl[r1]
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| 352 |
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lc r2,Textcols
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| 353 |
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lh r1,NormAttr
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| 354 |
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ori r1,r1,#$20
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| 355 |
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lh r4,Vidptr
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| 356 |
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.0001:
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| 357 |
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sh r1,[r4+r3]
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| 358 |
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addui r3,r3,#4
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| 359 |
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addui r2,r2,#-1
|
| 360 |
|
|
p0.ne br .0001
|
| 361 |
|
|
rts
|
| 362 |
|
|
|
| 363 |
|
|
;------------------------------------------------------------------------------
|
| 364 |
|
|
; Turn cursor on or off.
|
| 365 |
|
|
;------------------------------------------------------------------------------
|
| 366 |
|
|
|
| 367 |
|
|
CursorOn:
|
| 368 |
|
|
addui r27,r27,#-16
|
| 369 |
|
|
sw r1,8[r27]
|
| 370 |
|
|
sw r2,[r27]
|
| 371 |
|
|
lh r2,Vidregs
|
| 372 |
|
|
ldi r1,#$40
|
| 373 |
|
|
sh r1,hs:32[r2]
|
| 374 |
|
|
ldi r1,#$1F
|
| 375 |
|
|
sh r1,hs:36[r2]
|
| 376 |
|
|
lw r2,[r27]
|
| 377 |
|
|
lw r1,8[r27]
|
| 378 |
|
|
rts
|
| 379 |
|
|
|
| 380 |
|
|
CursorOff:
|
| 381 |
|
|
addui r27,r27,#-16
|
| 382 |
|
|
sw r1,8[r27]
|
| 383 |
|
|
sw r2,[r27]
|
| 384 |
|
|
lh r2,Vidregs
|
| 385 |
|
|
ldi r1,#$20
|
| 386 |
|
|
sh r1,hs:32[r2]
|
| 387 |
|
|
mov r1,r0
|
| 388 |
|
|
sh r1,hs:36[r2]
|
| 389 |
|
|
lw r2,[r27]
|
| 390 |
|
|
lw r1,8[r27]
|
| 391 |
|
|
rts
|
| 392 |
|
|
|
| 393 |
|
|
;------------------------------------------------------------------------------
|
| 394 |
|
|
; Get the number of text rows and columns from the video controller.
|
| 395 |
|
|
;------------------------------------------------------------------------------
|
| 396 |
|
|
|
| 397 |
|
|
GetTextRowscols:
|
| 398 |
|
|
lh r2,Vidregs
|
| 399 |
|
|
lvc r1,hs:0[r2]
|
| 400 |
|
|
sc r1,Textcols
|
| 401 |
|
|
lvc r1,hs:4[r2]
|
| 402 |
|
|
sc r1,Textrows
|
| 403 |
|
|
rts
|
| 404 |
|
|
|
| 405 |
|
|
;------------------------------------------------------------------------------
|
| 406 |
|
|
; Set cursor to home position.
|
| 407 |
|
|
;------------------------------------------------------------------------------
|
| 408 |
|
|
|
| 409 |
|
|
HomeCursor:
|
| 410 |
|
|
sc r0,CursorX
|
| 411 |
|
|
sc r0,CursorY
|
| 412 |
|
|
sc r0,VideoPos
|
| 413 |
|
|
ldi r1,#4
|
| 414 |
|
|
sc r1,$FFDC0600
|
| 415 |
|
|
|
| 416 |
|
|
;------------------------------------------------------------------------------
|
| 417 |
|
|
; Synchronize the absolute video position with the cursor co-ordinates.
|
| 418 |
|
|
; Does not modify any predicates.
|
| 419 |
|
|
;------------------------------------------------------------------------------
|
| 420 |
|
|
|
| 421 |
|
|
SyncVideoPos:
|
| 422 |
|
|
addui r27,r27,#-24
|
| 423 |
|
|
sw r1,16[r27] ; save off some working regs
|
| 424 |
|
|
sw r2,8[r27]
|
| 425 |
|
|
sw r3,[r27]
|
| 426 |
|
|
ldi r1,#5
|
| 427 |
|
|
sc r1,$FFDC0600
|
| 428 |
|
|
lc r2,CursorY
|
| 429 |
|
|
shli r2,r2,#1
|
| 430 |
|
|
lcu r1,cs:LineTbl[r2]
|
| 431 |
|
|
shrui r1,r1,#2
|
| 432 |
|
|
lc r2,CursorX
|
| 433 |
|
|
addu r1,r1,r2
|
| 434 |
|
|
sc r1,VideoPos
|
| 435 |
|
|
lh r3,Vidregs ; r3 = address of video registers
|
| 436 |
|
|
sh r1,hs:44[r3] ; Update the position in the text controller
|
| 437 |
|
|
lw r3,[r27] ; restore the regs
|
| 438 |
|
|
lw r2,8[r27]
|
| 439 |
|
|
lw r1,16[r27]
|
| 440 |
|
|
addui r27,r27,#24
|
| 441 |
|
|
rts
|
| 442 |
|
|
|
| 443 |
|
|
align 2
|
| 444 |
|
|
LineTbl:
|
| 445 |
|
|
dc 0
|
| 446 |
|
|
dc TEXTCOLS*4
|
| 447 |
|
|
dc TEXTCOLS*8
|
| 448 |
|
|
dc TEXTCOLS*12
|
| 449 |
|
|
dc TEXTCOLS*16
|
| 450 |
|
|
dc TEXTCOLS*20
|
| 451 |
|
|
dc TEXTCOLS*24
|
| 452 |
|
|
dc TEXTCOLS*28
|
| 453 |
|
|
dc TEXTCOLS*32
|
| 454 |
|
|
dc TEXTCOLS*36
|
| 455 |
|
|
dc TEXTCOLS*40
|
| 456 |
|
|
dc TEXTCOLS*44
|
| 457 |
|
|
dc TEXTCOLS*48
|
| 458 |
|
|
dc TEXTCOLS*52
|
| 459 |
|
|
dc TEXTCOLS*56
|
| 460 |
|
|
dc TEXTCOLS*60
|
| 461 |
|
|
dc TEXTCOLS*64
|
| 462 |
|
|
dc TEXTCOLS*68
|
| 463 |
|
|
dc TEXTCOLS*72
|
| 464 |
|
|
dc TEXTCOLS*76
|
| 465 |
|
|
dc TEXTCOLS*80
|
| 466 |
|
|
dc TEXTCOLS*84
|
| 467 |
|
|
dc TEXTCOLS*88
|
| 468 |
|
|
dc TEXTCOLS*92
|
| 469 |
|
|
dc TEXTCOLS*96
|
| 470 |
|
|
dc TEXTCOLS*100
|
| 471 |
|
|
dc TEXTCOLS*104
|
| 472 |
|
|
dc TEXTCOLS*108
|
| 473 |
|
|
dc TEXTCOLS*112
|
| 474 |
|
|
dc TEXTCOLS*116
|
| 475 |
|
|
dc TEXTCOLS*120
|
| 476 |
|
|
dc TEXTCOLS*124
|
| 477 |
|
|
|
| 478 |
|
|
TC1InitData:
|
| 479 |
|
|
dc 84 ; #columns
|
| 480 |
|
|
dc 31 ; #rows
|
| 481 |
|
|
dc 64 ; window left
|
| 482 |
|
|
dc 17 ; window top
|
| 483 |
|
|
dc 7 ; max scan line
|
| 484 |
|
|
dc $21 ; pixel size (hhhhvvvv)
|
| 485 |
|
|
dc $1FF ; transparent color
|
| 486 |
|
|
dc $40 ; cursor blink, start line
|
| 487 |
|
|
dc 31 ; cursor end
|
| 488 |
|
|
dc 0 ; start address
|
| 489 |
|
|
dc 0 ; cursor position
|
| 490 |
|
|
TC2InitData:
|
| 491 |
|
|
dc 40
|
| 492 |
|
|
dc 25
|
| 493 |
|
|
dc 376
|
| 494 |
|
|
dc 64 ; window top
|
| 495 |
|
|
dc 7
|
| 496 |
|
|
dc $10
|
| 497 |
|
|
dc $1FF
|
| 498 |
|
|
dc $40
|
| 499 |
|
|
dc 31
|
| 500 |
|
|
dc 0
|
| 501 |
|
|
dc 0
|
| 502 |
|
|
|
| 503 |
|
|
;------------------------------------------------------------------------------
|
| 504 |
|
|
; Convert Ascii character to screen character.
|
| 505 |
|
|
;------------------------------------------------------------------------------
|
| 506 |
|
|
|
| 507 |
|
|
AsciiToScreen:
|
| 508 |
|
|
zxb r1,r1
|
| 509 |
|
|
cmp p0,r1,#' '
|
| 510 |
|
|
p0.le ori r1,r1,#$100
|
| 511 |
|
|
p0.le br .0003
|
| 512 |
|
|
cmp p0,r1,#$5B ; special test for [ ] characters
|
| 513 |
|
|
p0.ne br .0001
|
| 514 |
|
|
ldi r1,#$11B
|
| 515 |
|
|
rts
|
| 516 |
|
|
.0001:
|
| 517 |
|
|
cmp p0,r1,#$5D
|
| 518 |
|
|
p0.ne br .0002
|
| 519 |
|
|
ldi r1,#$11D
|
| 520 |
|
|
rts
|
| 521 |
|
|
.0002:
|
| 522 |
|
|
ori r1,r1,#$100
|
| 523 |
|
|
biti p0,r1,#$20 ; if bit 5 isn't set
|
| 524 |
|
|
p0.eq br .0003
|
| 525 |
|
|
biti p0,r1,#$40 ; or bit 6 isn't set
|
| 526 |
|
|
p0.ne andi r1,r1,#$19F
|
| 527 |
|
|
.0003:
|
| 528 |
|
|
rts
|
| 529 |
|
|
|
| 530 |
|
|
;------------------------------------------------------------------------------
|
| 531 |
|
|
; Convert screen character to ascii character
|
| 532 |
|
|
;------------------------------------------------------------------------------
|
| 533 |
|
|
;
|
| 534 |
|
|
ScreenToAscii:
|
| 535 |
|
|
zxb r1,r1
|
| 536 |
|
|
cmpi p0,r1,#27
|
| 537 |
|
|
p0.le addi r1,r1,#$60
|
| 538 |
|
|
rts
|
| 539 |
|
|
|
| 540 |
|
|
.include "DisplayChar.asm"
|
| 541 |
|
|
|
| 542 |
|
|
;------------------------------------------------------------------------------
|
| 543 |
|
|
; Display a string on the screen.
|
| 544 |
|
|
;------------------------------------------------------------------------------
|
| 545 |
|
|
|
| 546 |
|
|
DisplayString:
|
| 547 |
|
|
ldi r1,#7
|
| 548 |
|
|
sc r1,$FFDC0600
|
| 549 |
|
|
ldis lc,#$FFF
|
| 550 |
|
|
.0001:
|
| 551 |
|
|
lbu r1,[r2]
|
| 552 |
|
|
tst p2,r1
|
| 553 |
|
|
p2.eq br .0002
|
| 554 |
|
|
bsr DisplayChar
|
| 555 |
|
|
addui r2,r2,#1
|
| 556 |
|
|
loop .0001
|
| 557 |
|
|
.0002:
|
| 558 |
|
|
rts
|
| 559 |
|
|
|
| 560 |
|
|
KeybdGetCharWait:
|
| 561 |
|
|
ldi r1,#-1
|
| 562 |
|
|
sb r1,KeybdWaitFlag
|
| 563 |
|
|
br KeybdGetChar
|
| 564 |
|
|
|
| 565 |
|
|
KeybdGetCharNoWait:
|
| 566 |
|
|
sb r0,KeybdWaitFlag
|
| 567 |
|
|
br KeybdGetChar
|
| 568 |
|
|
|
| 569 |
|
|
; Wait for a keyboard character to be available
|
| 570 |
|
|
; Returns (-1) if no key available
|
| 571 |
|
|
; Return key >= 0 if key is available
|
| 572 |
|
|
;
|
| 573 |
|
|
;
|
| 574 |
|
|
KeybdGetChar:
|
| 575 |
|
|
KeybdGetChar1:
|
| 576 |
|
|
addui r27,r27,#-16
|
| 577 |
|
|
sws c1,8[r27] ; save off link register
|
| 578 |
|
|
sw r2,[r27]
|
| 579 |
|
|
.0002:
|
| 580 |
|
|
.0003:
|
| 581 |
|
|
memsb
|
| 582 |
|
|
lvb r1,hs:KEYBD+1 ; check MSB of keyboard status reg.
|
| 583 |
|
|
biti p0,r1,#$80
|
| 584 |
|
|
p0.ne br .0006
|
| 585 |
|
|
lb r1,KeybdWaitFlag
|
| 586 |
|
|
tst p0,r1
|
| 587 |
|
|
p0.lt br .0003
|
| 588 |
|
|
lw r2,[r27]
|
| 589 |
|
|
lws c1,8[r27]
|
| 590 |
|
|
addui r27,r27,#16
|
| 591 |
|
|
rts
|
| 592 |
|
|
.0006:
|
| 593 |
|
|
memsb
|
| 594 |
|
|
lvb r1,hs:KEYBD ; get scan code value
|
| 595 |
|
|
memdb
|
| 596 |
|
|
zxb r1,r1 ; make unsigned
|
| 597 |
|
|
sb r0,hs:KEYBD+1 ; clear read flag
|
| 598 |
|
|
ldi r3,#3
|
| 599 |
|
|
sc r3,$FFDC0600
|
| 600 |
|
|
.0001:
|
| 601 |
|
|
cmp p0,r1,#SC_KEYUP ; keyup scan code ?
|
| 602 |
|
|
p0.eq br .doKeyup
|
| 603 |
|
|
cmp p0,r1,#SC_EXTEND; extended scan code ?
|
| 604 |
|
|
p0.eq br .doExtend
|
| 605 |
|
|
cmp p0,r1,#$14 ; control ?
|
| 606 |
|
|
p0.eq br .doCtrl
|
| 607 |
|
|
cmp p0,r1,#$12 ; left shift
|
| 608 |
|
|
p0.eq br .doShift
|
| 609 |
|
|
cmp p0,r1,#$59 ; right shift
|
| 610 |
|
|
p0.eq br .doShift
|
| 611 |
|
|
cmp p0,r1,#SC_NUMLOCK
|
| 612 |
|
|
p0.eq br .doNumLock
|
| 613 |
|
|
cmp p0,r1,#SC_CAPSLOCK
|
| 614 |
|
|
p0.eq br .doCapsLock
|
| 615 |
|
|
cmp p0,r1,#SC_SCROLLLOCK
|
| 616 |
|
|
p0.eq br .doScrollLock
|
| 617 |
|
|
lb r2,KeyState1
|
| 618 |
|
|
andi r2,r2,#1
|
| 619 |
|
|
cmp p0,r2,#0
|
| 620 |
|
|
p0.ne br .0003
|
| 621 |
|
|
lb r2,KeyState2 ; Is extended code ?
|
| 622 |
|
|
andi r2,r2,#$80
|
| 623 |
|
|
p0.eq br .0010
|
| 624 |
|
|
lb r2,KeyState2
|
| 625 |
|
|
andi r2,r2,#$7F
|
| 626 |
|
|
sb r2,KeyState2
|
| 627 |
|
|
sb r0,KeyState1 ; clear keyup
|
| 628 |
|
|
andi r1,r1,#$7F
|
| 629 |
|
|
lbu r1,cs:keybdExtendedCodes[r1]
|
| 630 |
|
|
br .0008
|
| 631 |
|
|
.0010:
|
| 632 |
|
|
ldi r3,#4
|
| 633 |
|
|
sc r3,$FFDC0600
|
| 634 |
|
|
lb r2,KeyState2
|
| 635 |
|
|
biti p0,r2,#4 ; Is Cntrl down ?
|
| 636 |
|
|
p0.eq br .0009
|
| 637 |
|
|
andi r1,r1,#$7F
|
| 638 |
|
|
lbu r1,cs:keybdControlCodes[r1]
|
| 639 |
|
|
br .0008
|
| 640 |
|
|
.0009:
|
| 641 |
|
|
lb r2,KeyState2
|
| 642 |
|
|
biti p0,r2,#1 ; Is shift down ?
|
| 643 |
|
|
p0.eq br .0007
|
| 644 |
|
|
andi r1,r1,#$FF
|
| 645 |
|
|
lbu r1,cs:shiftedScanCodes[r1]
|
| 646 |
|
|
br .0008
|
| 647 |
|
|
.0007:
|
| 648 |
|
|
andi r1,r1,#$FF
|
| 649 |
|
|
lbu r1,cs:unshiftedScanCodes[r1]
|
| 650 |
|
|
.0008:
|
| 651 |
|
|
ldi r3,#5
|
| 652 |
|
|
sc r3,$FFDC0600
|
| 653 |
|
|
lw r2,[r27]
|
| 654 |
|
|
lws c1,8[r27]
|
| 655 |
|
|
addui r27,r27,#16
|
| 656 |
|
|
rts
|
| 657 |
|
|
|
| 658 |
|
|
.doKeyup:
|
| 659 |
|
|
lb r2,KeyState1
|
| 660 |
|
|
ori r2,r2,#1
|
| 661 |
|
|
sb r2,KeyState1
|
| 662 |
|
|
br .0003
|
| 663 |
|
|
.doExtend:
|
| 664 |
|
|
lb r2,KeyState2
|
| 665 |
|
|
ori r2,r2,#$80
|
| 666 |
|
|
sb r2,KeyState2
|
| 667 |
|
|
br .0003
|
| 668 |
|
|
.doCtrl:
|
| 669 |
|
|
lb r2,KeyState1
|
| 670 |
|
|
biti p0,r2,#1
|
| 671 |
|
|
p0.eq br .0004
|
| 672 |
|
|
lbu r2,KeyState2
|
| 673 |
|
|
andi r2,r2,#~4
|
| 674 |
|
|
sb r2,KeyState2
|
| 675 |
|
|
br .0003
|
| 676 |
|
|
.0004:
|
| 677 |
|
|
lbu r2,KeyState2
|
| 678 |
|
|
ori r2,r2,#4
|
| 679 |
|
|
sb r2,KeyState2
|
| 680 |
|
|
br .0003
|
| 681 |
|
|
.doShift:
|
| 682 |
|
|
lb r2,KeyState1
|
| 683 |
|
|
biti p0,r2,#1
|
| 684 |
|
|
p0.eq br .0005
|
| 685 |
|
|
lbu r2,KeyState2
|
| 686 |
|
|
andi r2,r2,#~1
|
| 687 |
|
|
sb r2,KeyState2
|
| 688 |
|
|
br .0003
|
| 689 |
|
|
.0005:
|
| 690 |
|
|
lbu r2,KeyState2
|
| 691 |
|
|
ori r2,r2,#1
|
| 692 |
|
|
sb r2,KeyState2
|
| 693 |
|
|
br .0003
|
| 694 |
|
|
.doNumLock:
|
| 695 |
|
|
lbu r2,KeyState2
|
| 696 |
|
|
eori r2,r2,#16
|
| 697 |
|
|
sb r2,KeyState2
|
| 698 |
|
|
bsr KeybdSetLEDStatus
|
| 699 |
|
|
br .0003
|
| 700 |
|
|
.doCapsLock:
|
| 701 |
|
|
lbu r2,KeyState2
|
| 702 |
|
|
eori r2,r2,#32
|
| 703 |
|
|
sb r2,KeyState2
|
| 704 |
|
|
bsr KeybdSetLEDStatus
|
| 705 |
|
|
br .0003
|
| 706 |
|
|
.doScrollLock:
|
| 707 |
|
|
lbu r2,KeyState2
|
| 708 |
|
|
eori r2,r2,#64
|
| 709 |
|
|
sb r2,KeyState2
|
| 710 |
|
|
bsr KeybdSetLEDStatus
|
| 711 |
|
|
br .0003
|
| 712 |
|
|
|
| 713 |
|
|
;------------------------------------------------------------------------------
|
| 714 |
|
|
; Set the keyboard LED status leds.
|
| 715 |
|
|
; Trashes r1, p0
|
| 716 |
|
|
;------------------------------------------------------------------------------
|
| 717 |
|
|
|
| 718 |
|
|
KeybdSetLEDStatus:
|
| 719 |
|
|
addui r27,r27,#-8
|
| 720 |
|
|
sws c1,[r27]
|
| 721 |
|
|
sb r0,KeybdLEDs
|
| 722 |
|
|
lb r1,KeyState2
|
| 723 |
|
|
biti p0,r1,#16
|
| 724 |
|
|
p0.ne lb r1,KeybdLEDs ; set bit 1 for Num lock, 0 for scrolllock , 2 for caps lock
|
| 725 |
|
|
p0.ne ori r1,r1,#2
|
| 726 |
|
|
p0.ne sb r1,KeybdLEDs
|
| 727 |
|
|
lb r1,KeyState2
|
| 728 |
|
|
biti p0,r1,#32
|
| 729 |
|
|
p0.ne lb r1,KeybdLEDs
|
| 730 |
|
|
p0.ne ori r1,r1,#4
|
| 731 |
|
|
p0.ne sb r1,KeybdLEDs
|
| 732 |
|
|
lb r1,KeyState2
|
| 733 |
|
|
biti p0,r1,#64
|
| 734 |
|
|
p0.ne lb r1,KeybdLEDs
|
| 735 |
|
|
p0.ne ori r1,r1,#1
|
| 736 |
|
|
p0.ne sb r1,KeybdLEDs
|
| 737 |
|
|
ldi r1,#$ED
|
| 738 |
|
|
sb r1,hs:KEYBD ; set status LEDs command
|
| 739 |
|
|
bsr KeybdWaitTx
|
| 740 |
|
|
bsr KeybdRecvByte
|
| 741 |
|
|
cmpi p0,r1,#$FA
|
| 742 |
|
|
lb r1,KeybdLEDs
|
| 743 |
|
|
sb r1,hs:KEYBD
|
| 744 |
|
|
bsr KeybdWaitTx
|
| 745 |
|
|
bsr KeybdRecvByte
|
| 746 |
|
|
lws c1,[r27]
|
| 747 |
|
|
addui r27,r27,#8
|
| 748 |
|
|
rts
|
| 749 |
|
|
|
| 750 |
|
|
;------------------------------------------------------------------------------
|
| 751 |
|
|
; Receive a byte from the keyboard, used after a command is sent to the
|
| 752 |
|
|
; keyboard in order to wait for a response.
|
| 753 |
|
|
;
|
| 754 |
|
|
; Returns:
|
| 755 |
|
|
; r1 >= 0 if a scancode is available
|
| 756 |
|
|
; r1 = -1 on timeout
|
| 757 |
|
|
;------------------------------------------------------------------------------
|
| 758 |
|
|
;
|
| 759 |
|
|
KeybdRecvByte:
|
| 760 |
|
|
addui r27,r27,#-16
|
| 761 |
|
|
sws c1,8[r27]
|
| 762 |
|
|
sw r3,[r27]
|
| 763 |
|
|
ldi r3,#20 ; wait up to .2s
|
| 764 |
|
|
.0003:
|
| 765 |
|
|
bsr KeybdWaitBusy
|
| 766 |
|
|
lb r1,hs:KEYBD+1 ; wait for response from keyboard
|
| 767 |
|
|
biti p0,r1,#$80 ; is input buffer full ?
|
| 768 |
|
|
p0.ne br .0004 ; yes, branch
|
| 769 |
|
|
bsr Wait10ms ; wait a bit
|
| 770 |
|
|
addui r3,r3,#-1
|
| 771 |
|
|
tst p0,r3
|
| 772 |
|
|
p0.ne br .0003 ; go back and try again
|
| 773 |
|
|
lw r3,[r27] ; timeout
|
| 774 |
|
|
lws c1,8[r27]
|
| 775 |
|
|
addui r27,r27,#16
|
| 776 |
|
|
ldi r1,#-1
|
| 777 |
|
|
rts
|
| 778 |
|
|
.0004:
|
| 779 |
|
|
lvb r1,hs:KEYBD ; get scancode
|
| 780 |
|
|
zxb r1,r1 ; convert to unsigned char
|
| 781 |
|
|
sb r0,hs:KEYBD+1 ; clear recieve state
|
| 782 |
|
|
lw r3,[r27]
|
| 783 |
|
|
lws c1,8[r27]
|
| 784 |
|
|
addui r27,r27,#16
|
| 785 |
|
|
rts ; return char in r1
|
| 786 |
|
|
|
| 787 |
|
|
;------------------------------------------------------------------------------
|
| 788 |
|
|
; Wait until the keyboard isn't busy anymore
|
| 789 |
|
|
; Wait until the keyboard transmit is complete
|
| 790 |
|
|
; Returns:
|
| 791 |
|
|
; r1 >= 0 if successful
|
| 792 |
|
|
; r1 < 0 if timed out
|
| 793 |
|
|
;------------------------------------------------------------------------------
|
| 794 |
|
|
;
|
| 795 |
|
|
KeybdWaitBusy: ; alias for KeybdWaitTx
|
| 796 |
|
|
KeybdWaitTx:
|
| 797 |
|
|
addui r27,r27,#-16
|
| 798 |
|
|
sws c1,8[r27]
|
| 799 |
|
|
sw r3,[r27]
|
| 800 |
|
|
ldi r3,#10 ; wait a max of .1s
|
| 801 |
|
|
.0001:
|
| 802 |
|
|
lvb r1,hs:KEYBD+1
|
| 803 |
|
|
biti p0,r1,#$40 ; check for transmit busy bit
|
| 804 |
|
|
p0.eq br .0002 ; branch if bit clear
|
| 805 |
|
|
bsr Wait10ms ; delay a little bit
|
| 806 |
|
|
addui r3,r3,#-1 ; go back and try again
|
| 807 |
|
|
tst p0,r3
|
| 808 |
|
|
p0.ne br .0001
|
| 809 |
|
|
lw r3,[r27] ; timed out
|
| 810 |
|
|
lws c1,8[r27]
|
| 811 |
|
|
addui r27,r27,#16
|
| 812 |
|
|
ldi r1,#-1 ; return -1
|
| 813 |
|
|
rts
|
| 814 |
|
|
.0002:
|
| 815 |
|
|
lw r3,[r27] ; wait complete, return
|
| 816 |
|
|
lws c1,8[r27] ; restore return address
|
| 817 |
|
|
ldi r1,#0 ; return 0 for okay
|
| 818 |
|
|
addui r27,r27,#16
|
| 819 |
|
|
rts
|
| 820 |
|
|
|
| 821 |
|
|
;------------------------------------------------------------------------------
|
| 822 |
|
|
; Delay for about 10 ms.
|
| 823 |
|
|
;------------------------------------------------------------------------------
|
| 824 |
|
|
|
| 825 |
|
|
Wait10ms:
|
| 826 |
|
|
addui r27,r27,#-16
|
| 827 |
|
|
sw r1,8[r27]
|
| 828 |
|
|
sw r2,[r27]
|
| 829 |
|
|
mfspr r1,tick
|
| 830 |
|
|
addui r1,r1,#250000 ; 10ms at 25 MHz
|
| 831 |
|
|
.0001:
|
| 832 |
|
|
mfspr r2,tick
|
| 833 |
|
|
cmp p0,r2,r1
|
| 834 |
|
|
p0.lt br .0001
|
| 835 |
|
|
lw r2,[r27]
|
| 836 |
|
|
lw r1,8[r27]
|
| 837 |
|
|
addui r27,r27,#16
|
| 838 |
|
|
rts
|
| 839 |
|
|
|
| 840 |
|
|
;--------------------------------------------------------------------------
|
| 841 |
|
|
; PS2 scan codes to ascii conversion tables.
|
| 842 |
|
|
;--------------------------------------------------------------------------
|
| 843 |
|
|
;
|
| 844 |
|
|
unshiftedScanCodes:
|
| 845 |
|
|
byte $2e,$a9,$2e,$a5,$a3,$a1,$a2,$ac
|
| 846 |
|
|
byte $2e,$aa,$a8,$a6,$a4,$09,$60,$2e
|
| 847 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$71,$31,$2e
|
| 848 |
|
|
byte $2e,$2e,$7a,$73,$61,$77,$32,$2e
|
| 849 |
|
|
byte $2e,$63,$78,$64,$65,$34,$33,$2e
|
| 850 |
|
|
byte $2e,$20,$76,$66,$74,$72,$35,$2e
|
| 851 |
|
|
byte $2e,$6e,$62,$68,$67,$79,$36,$2e
|
| 852 |
|
|
byte $2e,$2e,$6d,$6a,$75,$37,$38,$2e
|
| 853 |
|
|
byte $2e,$2c,$6b,$69,$6f,$30,$39,$2e
|
| 854 |
|
|
byte $2e,$2e,$2f,$6c,$3b,$70,$2d,$2e
|
| 855 |
|
|
byte $2e,$2e,$27,$2e,$5b,$3d,$2e,$2e
|
| 856 |
|
|
byte $ad,$2e,$0d,$5d,$2e,$5c,$2e,$2e
|
| 857 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$08,$2e
|
| 858 |
|
|
byte $2e,$95,$2e,$93,$94,$2e,$2e,$2e
|
| 859 |
|
|
byte $98,$7f,$92,$2e,$91,$90,$1b,$af
|
| 860 |
|
|
byte $ab,$2e,$97,$2e,$2e,$96,$ae,$2e
|
| 861 |
|
|
|
| 862 |
|
|
byte $2e,$2e,$2e,$a7,$2e,$2e,$2e,$2e
|
| 863 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 864 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 865 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 866 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 867 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 868 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 869 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 870 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 871 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 872 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 873 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 874 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 875 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 876 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 877 |
|
|
byte $2e,$2e,$fa,$2e,$2e,$2e,$2e,$2e
|
| 878 |
|
|
|
| 879 |
|
|
shiftedScanCodes:
|
| 880 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 881 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$09,$7e,$2e
|
| 882 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$51,$21,$2e
|
| 883 |
|
|
byte $2e,$2e,$5a,$53,$41,$57,$40,$2e
|
| 884 |
|
|
byte $2e,$43,$58,$44,$45,$24,$23,$2e
|
| 885 |
|
|
byte $2e,$20,$56,$46,$54,$52,$25,$2e
|
| 886 |
|
|
byte $2e,$4e,$42,$48,$47,$59,$5e,$2e
|
| 887 |
|
|
byte $2e,$2e,$4d,$4a,$55,$26,$2a,$2e
|
| 888 |
|
|
byte $2e,$3c,$4b,$49,$4f,$29,$28,$2e
|
| 889 |
|
|
byte $2e,$3e,$3f,$4c,$3a,$50,$5f,$2e
|
| 890 |
|
|
byte $2e,$2e,$22,$2e,$7b,$2b,$2e,$2e
|
| 891 |
|
|
byte $2e,$2e,$0d,$7d,$2e,$7c,$2e,$2e
|
| 892 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$08,$2e
|
| 893 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 894 |
|
|
byte $2e,$7f,$2e,$2e,$2e,$2e,$1b,$2e
|
| 895 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 896 |
|
|
|
| 897 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 898 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 899 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 900 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 901 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 902 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 903 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 904 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 905 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 906 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 907 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 908 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 909 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 910 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 911 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 912 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 913 |
|
|
|
| 914 |
|
|
; control
|
| 915 |
|
|
keybdControlCodes:
|
| 916 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 917 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$09,$7e,$2e
|
| 918 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$11,$21,$2e
|
| 919 |
|
|
byte $2e,$2e,$1a,$13,$01,$17,$40,$2e
|
| 920 |
|
|
byte $2e,$03,$18,$04,$05,$24,$23,$2e
|
| 921 |
|
|
byte $2e,$20,$16,$06,$14,$12,$25,$2e
|
| 922 |
|
|
byte $2e,$0e,$02,$08,$07,$19,$5e,$2e
|
| 923 |
|
|
byte $2e,$2e,$0d,$0a,$15,$26,$2a,$2e
|
| 924 |
|
|
byte $2e,$3c,$0b,$09,$0f,$29,$28,$2e
|
| 925 |
|
|
byte $2e,$3e,$3f,$0c,$3a,$10,$5f,$2e
|
| 926 |
|
|
byte $2e,$2e,$22,$2e,$7b,$2b,$2e,$2e
|
| 927 |
|
|
byte $2e,$2e,$0d,$7d,$2e,$7c,$2e,$2e
|
| 928 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$08,$2e
|
| 929 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 930 |
|
|
byte $2e,$7f,$2e,$2e,$2e,$2e,$1b,$2e
|
| 931 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 932 |
|
|
|
| 933 |
|
|
keybdExtendedCodes:
|
| 934 |
|
|
byte $2e,$2e,$2e,$2e,$a3,$a1,$a2,$2e
|
| 935 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 936 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 937 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 938 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 939 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 940 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 941 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 942 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 943 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 944 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 945 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 946 |
|
|
byte $2e,$2e,$2e,$2e,$2e,$2e,$2e,$2e
|
| 947 |
|
|
byte $2e,$95,$2e,$93,$94,$2e,$2e,$2e
|
| 948 |
|
|
byte $98,$99,$92,$2e,$91,$90,$2e,$2e
|
| 949 |
|
|
byte $2e,$2e,$97,$2e,$2e,$96,$2e,$2e
|
| 950 |
|
|
|
| 951 |
|
|
|
| 952 |
|
|
;------------------------------------------------------------------------------
|
| 953 |
|
|
; Uninitialized interrupt
|
| 954 |
|
|
;------------------------------------------------------------------------------
|
| 955 |
|
|
uii_rout:
|
| 956 |
|
|
addui r27,r27,#-16
|
| 957 |
|
|
sw r1,[r27]
|
| 958 |
|
|
sws hs,8[r27]
|
| 959 |
|
|
|
| 960 |
|
|
; set I/O segment
|
| 961 |
|
|
ldis hs,#$FFD00000
|
| 962 |
|
|
|
| 963 |
|
|
; update on-screen IRQ live indicator
|
| 964 |
|
|
ldi r1,#'U'|%011000000_111111111_00_00000000
|
| 965 |
|
|
sh r1,hs:TEXTSCR+320
|
| 966 |
|
|
|
| 967 |
|
|
; restore regs and return
|
| 968 |
|
|
lw r1,[r27]
|
| 969 |
|
|
lws hs,8[r27]
|
| 970 |
|
|
addui r27,r27,#16
|
| 971 |
|
|
rti
|
| 972 |
|
|
|
| 973 |
|
|
;------------------------------------------------------------------------------
|
| 974 |
|
|
; Non-maskable interrupt routine.
|
| 975 |
|
|
;
|
| 976 |
|
|
;------------------------------------------------------------------------------
|
| 977 |
|
|
;
|
| 978 |
|
|
nmi_rout:
|
| 979 |
|
|
addui r27,r27,#-16
|
| 980 |
|
|
sw r1,[r27]
|
| 981 |
|
|
sws hs,8[r27]
|
| 982 |
|
|
|
| 983 |
|
|
; set I/O segment
|
| 984 |
|
|
ldis hs,#$FFD00000
|
| 985 |
|
|
|
| 986 |
|
|
; reset the edge sense circuit to re-enable interrupts
|
| 987 |
|
|
ldi r1,#0
|
| 988 |
|
|
sh r1,hs:PIC_ESR
|
| 989 |
|
|
|
| 990 |
|
|
; update on-screen IRQ live indicator
|
| 991 |
|
|
lh r1,hs:TEXTSCR+324
|
| 992 |
|
|
addui r1,r1,#1
|
| 993 |
|
|
sh r1,hs:TEXTSCR+324
|
| 994 |
|
|
|
| 995 |
|
|
; restore regs and return
|
| 996 |
|
|
lw r1,[r27]
|
| 997 |
|
|
lws hs,8[r27]
|
| 998 |
|
|
addui r27,r27,#16
|
| 999 |
|
|
rti
|
| 1000 |
|
|
|
| 1001 |
|
|
;------------------------------------------------------------------------------
|
| 1002 |
|
|
; Time Slice IRQ routine.
|
| 1003 |
|
|
;
|
| 1004 |
|
|
;
|
| 1005 |
|
|
;------------------------------------------------------------------------------
|
| 1006 |
|
|
;
|
| 1007 |
|
|
tms_rout:
|
| 1008 |
|
|
addui r27,r27,#-16
|
| 1009 |
|
|
sw r1,[r27]
|
| 1010 |
|
|
sws hs,8[r27]
|
| 1011 |
|
|
|
| 1012 |
|
|
; set I/O segment
|
| 1013 |
|
|
ldis hs,#$FFD00000
|
| 1014 |
|
|
|
| 1015 |
|
|
; reset the edge sense circuit to re-enable interrupts
|
| 1016 |
|
|
ldi r1,#2
|
| 1017 |
|
|
sh r1,hs:PIC_ESR
|
| 1018 |
|
|
|
| 1019 |
|
|
; update on-screen IRQ live indicator
|
| 1020 |
|
|
lh r1,hs:TEXTSCR+328
|
| 1021 |
|
|
addui r1,r1,#1
|
| 1022 |
|
|
sh r1,hs:TEXTSCR+328
|
| 1023 |
|
|
|
| 1024 |
|
|
; restore regs and return
|
| 1025 |
|
|
lw r1,[r27]
|
| 1026 |
|
|
lws hs,8[r27]
|
| 1027 |
|
|
addui r27,r27,#16
|
| 1028 |
|
|
rti
|
| 1029 |
|
|
|
| 1030 |
|
|
;------------------------------------------------------------------------------
|
| 1031 |
|
|
; Break routine
|
| 1032 |
|
|
;
|
| 1033 |
|
|
; Currently uses only registers in case memory is bad, and sets an indicator
|
| 1034 |
|
|
; on-screen.
|
| 1035 |
|
|
;------------------------------------------------------------------------------
|
| 1036 |
|
|
;
|
| 1037 |
|
|
brk_rout:
|
| 1038 |
|
|
ldi r1,#'B'
|
| 1039 |
|
|
bsr AsciiToScreen
|
| 1040 |
|
|
ori r1,r1,#|%011000000_111111111_00_00000000
|
| 1041 |
|
|
sh r1,$FFD00000
|
| 1042 |
|
|
ldi r1,#'R'
|
| 1043 |
|
|
bsr AsciiToScreen
|
| 1044 |
|
|
ori r1,r1,#|%011000000_111111111_00_00000000
|
| 1045 |
|
|
sh r1,$FFD00004
|
| 1046 |
|
|
ldi r1,#'K'
|
| 1047 |
|
|
bsr AsciiToScreen
|
| 1048 |
|
|
ori r1,r1,#|%011000000_111111111_00_00000000
|
| 1049 |
|
|
sh r1,$FFD00008
|
| 1050 |
|
|
brk_lockup:
|
| 1051 |
|
|
br brk_lockup[c0]
|
| 1052 |
|
|
|
| 1053 |
|
|
; code snippet to jump to the break routine, copied to the break vector
|
| 1054 |
|
|
;
|
| 1055 |
|
|
; vector table jumps
|
| 1056 |
|
|
;
|
| 1057 |
|
|
align 4
|
| 1058 |
|
|
brk_jmp: jmp brk_rout[c0]
|
| 1059 |
|
|
align 4
|
| 1060 |
|
|
tms_jmp: jmp tms_rout[c0]
|
| 1061 |
|
|
align 4
|
| 1062 |
|
|
nmi_jmp: jmp nmi_rout[c0]
|
| 1063 |
|
|
align 4
|
| 1064 |
|
|
uii_jmp: jmp uii_rout[c0]
|
| 1065 |
|
|
|
| 1066 |
|
|
;------------------------------------------------------------------------------
|
| 1067 |
|
|
; Reset Point
|
| 1068 |
|
|
;------------------------------------------------------------------------------
|
| 1069 |
|
|
|
| 1070 |
|
|
org $FFFFEFF0
|
| 1071 |
|
|
jmp cold_start[C15]
|
| 1072 |
|
|
|
