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annotate level2/modules/kernel/fdebug.asm @ 3127:36061ff9e324

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l2 kernel: Replaced literal FF91 and FFA* with symbolic references Zero functional changes; binaries equivalence verified by diff'ing the listing files before and after.
author Neal Crook <foofoobedoo@gmail.com>
date Mon, 28 Nov 2016 13:02:16 +0000
parents 039ddb7c8ad7
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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039ddb7c8ad7 l2 kernel: Remove tabs and trailing whitespace, align comments
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1 ******************************************************
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2 * F$Debug entry point
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3 *
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4 * Enter the debugger (or reboot)
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5 *
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6 * Input: A = Function code
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7 *
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8
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9 FDebug equ *
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10 * Determine if this is a system process or super user
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11 * Only they have permission to reboot
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12 lda R$A,u
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13 cmpa #255 reboot request
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14 bne leave nope
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15 ldx <D.Proc
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16 ldd P$User,x get user ID
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17 beq REBOOT
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18 comb
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19 ldb #E$UnkSvc
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20 leave rts
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21
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22 * NOTE: HIGHLY MACHINE DEPENDENT CODE!
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23 * THIS CODE IS SPECIFIC TO THE COCO 3!
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24 REBOOT orcc #IntMasks turn off IRQ's
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25 clrb
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26 stb >DAT.Regs map in block 0
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27 stb >$0071 cold reboot
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28 lda #$38 bottom of DECB block mapping
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29 sta >DAT.Regs map in block zero
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30 stb >$0071 and cold reboot here, too
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31 ldu #$0000 force code to go at offset $0000
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32 leax ReBootLoc,pc reboot code
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33 ldy #CodeSize
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34 cit.loop lda ,x+
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35 sta ,u+
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36 leay -1,y
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37 bne cit.loop
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38 clr >$FEED cold reboot
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39 clr >$FFD8 go to low speed
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40 jmp >$0000 jump to the reset code
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41
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42 ReBootLoc
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43 ldd #$3808 block $38, 8 times
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44 ldx #DAT.Regs where to put it
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45 Lp sta 8,x put into map 1
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46 sta ,x+ and into map 0
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47 inca
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48 decb count down
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49 bne Lp
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50
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51 lda #$4C standard DECB mapping
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52 sta >$FF90
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53 clr >DAT.Task go to map type 0
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54 clr >$FFDE and to all-ROM mode
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55 ldd #$FFFF
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56 * clrd executes as CLRA on a 6809
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57 fdb $104F
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58 tstb is it a 6809?
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59 bne Reset yup, skip ahead
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60 * ldmd #$00 go to 6809 mode!
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61 fcb $11,$3D,$00
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62 Reset jmp [$FFFE] do a reset
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63 CodeSize equ *-ReBootLoc