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annotate level2/modules/kernel/ccbfnproc.asm @ 3195:6eb2edad80d8

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L2: Introduce symbol KrnBlk to define kernel block number This is the block number that the kernel is loaded into. This is platform-specific, a function of the behaviour of the platform MMU/DAT. CRCs are unaffected by this change.
author Neal Crook <foofoobedoo@gmail.com>
date Thu, 01 Jun 2017 22:13:49 +0100
parents 039ddb7c8ad7
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 **************************************************
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2 * System Call: F$NProc
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3 *
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4 * Function: Start the next process in the active queue
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5 *
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6 * Input: None
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7 *
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8 * Output: Control does not return to the caller
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9 *
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10 FNProc
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11 IFGT Level-1
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12 ldx <D.SysPrc get system process descriptor
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13 stx <D.Proc save it as current
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14 lds <D.SysStk get system stack pointer
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15 andcc #^IntMasks re-enable IRQ's (to allow pending one through)
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16 ELSE
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17 clra
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18 clrb
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19 std <D.Proc
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20 ENDC
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21 fcb $8C skip the next 2 bytes
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22
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23 L0D91 cwai #^IntMasks re-enable IRQ's and wait for one
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24 L0D93 orcc #IntMasks Shut off interrupts again
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25 lda #Suspend get suspend suspend state flag
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26 ldx #D.AProcQ-P$Queue For start of loop, setup to point to current process
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27
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28 * Loop to find next active process that is not Suspended
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29 L0D9A leay ,x Point y to previous link (process dsc. ptr)
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30 ldx P$Queue,y Get process dsc. ptr for next active process
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31 beq L0D91 None, allow any pending IRQ thru & try again
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32 bita P$State,x There is one, is it Suspended?
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33 bne L0D9A Yes, skip it & try next one
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34
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35 * Found a process in line ready to be started
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36 ldd P$Queue,x Get next process dsc. ptr in line after found one
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37 std P$Queue,y Save the next one in line in previous' next ptr
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38 stx <D.Proc Make new process dsc. the current one
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39 lbsr L0C58 Go check or make a task # for the found process
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40 bcs L0D83 Couldn't get one, go to next process in line
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41 lda <D.TSlice Reload # ticks this process can run
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42 sta <D.Slice Save as new tick counter for process
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43 ldu P$SP,x get the process stack pointer
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44 lda P$State,x get it's state
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45 lbmi L0E29 If in System State, switch to system task (0)
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46 L0DB9 bita #Condem Was it condemned by a deadly signal?
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47 bne L0DFD Yes, go exit with Error=the signal code #
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48 lbsr TstImg do a F$SetTsk if the ImgChg flag is set
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49 L0DBD ldb <P$Signal,x any signals?
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50 beq L0DF7 no, go on
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51 decb is it a wake up signal?
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52 beq L0DEF yes, go wake it up
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53 leas -R$Size,s make a register buffer on stack
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54 leau ,s point to it
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55 lbsr L02CB copy the stack from process to our copy of it
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56 lda <P$Signal,x get last signal
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57 sta R$B,u save it to process' B
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58
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59 ldd <P$SigVec,x any intercept trap?
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60 beq L0DFD no, go force the process to F$Exit
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61 std R$PC,u save vector to it's PC
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62 ldd <P$SigDat,x get pointer to intercept data area
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63 std R$U,u save it to it's U
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64 ldd P$SP,x get it's stack pointer
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65 subd #R$Size take off register stack
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66 std P$SP,x save updated SP
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67 lbsr L02DA Copy modified stack back overtop process' stack
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68 leas R$Size,s purge temporary stack
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69 L0DEF clr <P$Signal,x clear the signal
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70
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71 * No signals go here
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72 L0DF7 equ *
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73 IFNE H6309
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74 oim #$01,<D.Quick
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75 ELSE
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76 ldb <D.Quick
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77 orb #$01
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78 stb <D.Quick
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79 ENDC
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80 BackTo1 equ *
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81 L0DF2 ldu <D.UsrSvc Get current User's system call service routine ptr
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82 stu <D.XSWI2 Save as SWI2 service routine ptr
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83 ldu <D.UsrIRQ Get IRQ entry point for user state
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84 stu <D.XIRQ Save as IRQ service routine ptr
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85
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86 ldb P$Task,x get task number
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87 lslb 2 bytes per entry in D.TskIpt
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88 ldy P$SP,x get stack pointer
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89 lbsr L0E8D re-map the DAT image, if necessary
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90
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91 ldb <D.Quick get quick return flag
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92 lbra L0E4C Go switch GIME over to new process & run
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93
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94 * Process a signal (process had no signal trap)
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95 L0DFD equ *
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96 IFNE H6309
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97 oim #SysState,P$State,x Put process into system state
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98 ELSE
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99 ldb P$State,x
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100 orb #SysState
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101 stb P$State,x
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102 ENDC
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103 leas >P$Stack,x Point SP to process' stack
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104 andcc #^IntMasks Turn interrupts on
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105 ldb <P$Signal,x Get signal that process received
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106 clr <P$Signal,x Clear out the one in process dsc.
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107 os9 F$Exit Exit with signal # being error code
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108
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109 S.SvcIRQ jmp [>D.Poll] Call IOMAN for IRQ polling