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preserve 0x1xx stack for main task, and restore on quit

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This commit is contained in:
Jeremy Penner 2021-08-20 22:29:21 -04:00
parent c428ef3d9c
commit b2d374622a
2 changed files with 9 additions and 5 deletions
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4
ssc/iigs/bootstub.fnl
View file

@ -13,8 +13,9 @@
(global long BootHandle-e1)
(fn boot ()
(asm (clc) (xce) (rep 0x30)) ; disable emulation mode, 16-bit index registers
(save-dp-sp)
(save-dp-sp 0x0800)
(set-task-base 0x0800) ; space for 8 tasks
(save-6502-stack)
; http://www.1000bit.it/support/manuali/apple/technotes/pdos/tn.pdos.27.html
; When bootstrapping with no OS, we must reserve
@ -39,6 +40,7 @@
(MTShutDown)
(restore-6502-stack)
(restore-dp-sp)
(asm (sec) (xce)) ; re-enter emulation mode
))

6
ssc/task.fnl
View file

@ -11,7 +11,9 @@
(form save-dp-sp [#[:block [:tdc] [:sta :old-dp] [:tsc] [:sta :old-sp]]])
(form restore-dp-sp [#[:block [:lda :old-dp] [:tcd] [:lda :old-sp] [:tcs]]])
(form save-6502-stack [#[:block [:tsc] [:tay] [:and 0xff] [:ora 0x100] [:tax] [:eor 0xffff] [:clc] [:adc 0x200] [:mvn 0 0]]])
(form restore-6502-stack [#[:block [:tsc] [:tax] [:and 0xff] [:ora 0x100] [:tay] [:eor 0xffff] [:clc] [:adc 0x200] [:mvn 0 0]]])
; 0x1ef = 0x1ef-0x1ff = 0x0f -> 0x7f
(const task-size 0x100)
(global word first-task)
(global word last-task)
@ -19,7 +21,7 @@
(form set-task-base [(fn [ssc task-base]
[:block [:lda task-base] [:tcd]
[:sta ssc.TASK-NEXT] [:sta :first-task] [:sta :last-task]
[:lda (+ task-base 0xff)] [:tcs]])])
[:tsc] [:and 0xff] [:ora task-base] [:tcs]])])
(fn yield ()
(asm (tsc) (sta [$1.TASK-STACK])