121 lines
2.7 KiB
Plaintext
121 lines
2.7 KiB
Plaintext
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{ 0x100 var, userhere
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: userallot userhere @ + userhere ! ;
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: userarray userhere @ CONST userallot ;
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: uservar cell userarray ; }
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uservar tasksp
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uservar taskbp
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uservar tasksi
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uservar taskcoff
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uservar taskcs
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uservar next-task
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:asm @u ( p -- v )
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POP BX
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PUSH @[ SS: BX]
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NEXT
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:asm !u ( v p -- )
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POP BX
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POP AX
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MOV @[ SS: BX] AX
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NEXT
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:asm get-cseg PUSH CS NEXT
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{ :asm get-host-cseg PUSH CS NEXT }
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:asm suspend
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MOV @[ SS: taskcs @] CS
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MOV @[ SS: tasksp @] SP
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MOV @[ SS: taskbp @] BP
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MOV @[ SS: tasksi @] SI
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MOV AX @[ SS: next-task @]
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L: resume-task-ax
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MOV SS AX
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MOV SP @[ SS: tasksp @]
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MOV BP @[ SS: taskbp @]
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MOV SI @[ SS: tasksi @]
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MOV DS @[ SS: taskcs @]
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LODSW
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MOV BX AX
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MOV AX @[ BX]
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MOV @[ SS: taskcoff @] AX
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JMP FAR @[ SS: taskcoff @]
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:asm resume-task ( taskseg -- )
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POP AX
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JMP resume-task-ax
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:asm taskseg
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PUSH SS
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NEXT
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0 var, first-task
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0 var, last-task
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0x200 4 >> const tasksegsize
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( taskseg -- taskseg )
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deferred task-init noop
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: init-first-task
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taskseg dup next-task !u task-init dup first-task ! last-task ! ;
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init-first-task
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' init :chain init-first-task ;
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:asm unlink-task ( prevtaskseg taskseg -- )
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MOV CX SS
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POP AX
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POP BX
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MOV SS AX
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MOV DX @[ SS: next-task @]
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XOR AX AX
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MOV @[ SS: next-task @] AX
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MOV SS BX
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MOV @[ SS: next-task @] DX
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MOV SS CX
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NEXT
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: prev-taskseg ( -- taskseg )
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first-task @ begin next-task over @far taskseg != while
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tasksegsize + repeat ;
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: next-unused-taskseg
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first-task @ begin next-task over @far over last-task @ <= and while
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tasksegsize + repeat ;
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: task-complete next-task @u prev-taskseg taskseg unlink-task resume-task [
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: task-arise execute task-complete [
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{ : task-arise-host execute task-complete [ }
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:asm link-new-task ( taskseg -- )
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MOV CX SS
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POP AX ( taskseg )
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( save the current next task in BX so we can point the new task at it )
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MOV BX @[ SS: next-task @]
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( link our task segment to the new task )
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MOV @[ SS: next-task @] AX
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MOV SS AX
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MOV AX 0x100 #
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MOV @[ SS: tasksp @] AX
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XOR AX AX
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MOV @[ SS: taskbp @] AX
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MOV @[ SS: next-task @] BX
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MOV SS CX ( restore the current task )
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NEXT
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: push-into-task ( v taskseg -- )
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>r tasksp r@ @far 2 - dup tasksp r@ !far <r !far ;
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: spawn-task-raw ( cp cseg arise -- taskseg )
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next-unused-taskseg >r r@ link-new-task
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r@ last-task @ > if r@ last-task ! then
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cell + tasksi r@ !far
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taskcs r@ !far
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r@ push-into-task
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<r task-init ;
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: spawn-task ( cp -- taskseg )
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get-cseg ' task-arise spawn-task-raw ;
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{ : spawn-task ( cp -- taskseg )
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get-host-cseg ' task-arise-host spawn-task-raw ; }
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