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maxkernel.t
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1988-05-02
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(herald maxkernel
(env tsys))
;;; Copyright (c) 1985 Yale University
;;; Authors: N Adams, R Kelsey, D Kranz, J Philbin, J Rees.
;;; This material was developed by the T Project at the Yale University Computer
;;; Science Department. Permission to copy this software, to redistribute it,
;;; and to use it for any purpose is granted, subject to the following restric-
;;; tions and understandings.
;;; 1. Any copy made of this software must include this copyright notice in full.
;;; 2. Users of this software agree to make their best efforts (a) to return
;;; to the T Project at Yale any improvements or extensions that they make,
;;; so that these may be included in future readdrses; and (b) to inform
;;; the T Project of noteworthy uses of this software.
;;; 3. All materials developed as a consequence of the use of this software
;;; shall duly acknowledge such use, in accordance with the usual standards
;;; of acknowledging credit in academic research.
;;; 4. Yale has made no warrantee or representation that the operation of
;;; this software will be error-free, and Yale is under no obligation to
;;; provide any services, by way of maintenance, update, or otherwise.
;;; 5. In conjunction with products arising from the use of this material,
;;; there shall be no use of the name of the Yale University nor of any
;;; adaptation thereof in any advertising, promotional, or sales literature
;;; without prior written consent from Yale in each case.
;;;
;;; The procedure big_bang MUST come first in this file. boot-arg-offset
;;; When we enter Big_bang the stack looks as follows:
;;; ________________
;;; | debug? | not a boot arg
;;; |_______________|
;;; | argv | Command line argv
;;; |_______________|
;;; | argc | Command line argc
;;; |_______________|
;;; | heap-size | Size of the static storage area
;;; |_______________|
;;; | heap2 | Base addresss of static
;;; |_______________| storage area
;;; | heap1 |
;;; |_______________|
;;; SP => | return addr |
;;; |_______________|
;;;
;;; The address of interrupt_xenoid (see $BUILD/max_start_t.s) is in S0.
;++ replace the numbers 1 and 3 below with boot/heap1 and boot/heap-size
(define (big_bang)
(lap (n32-big-bang *boot*)
;; set up global-constants
(ashi d ($ 2) S0)
(movi d S0 (d@r nil-reg slink/interrupt-handler))
(spri d SP A1) ; save ptr to args
(movi d ($ (fx+ (fixnum-ashl 6 8) header/general-vector)) ; 6 boot-args
(tos))
(addr (d@r SP 2) A2) ; second arg to boot
(movi d A2 (d@r nil-reg slink/boot-args)) ; set up boot-args
(movi d (d@r P (static 'n32-big-bang)) P)
(movi d (d@r p 2) p)
(movi d (d@r P -2) A2)
(addr (label big-bang-return) AN) ; temp because TP is special
(movi d AN TP)
;;; note that pointer to boot args is in A1
(jump (@r A2))
big-bang-return
;; initialize area,area-frontier and area-limit
(movi d (d@r A1 4) S0) ; get address of heap
(movi d S0 (d@r TASK task/area-begin))
(movi d S0 (d@r TASK task/area-frontier))
(addi d (d@r A1 12) S0) ; add size to base
(movi d S0 (d@r TASK task/area-limit))
;; Set up the procedure register P and call boot,
;; never to return. (note: arg 2 (*boot-args*) setup above)
(spri d nil-reg A3)
(cmpi b ($ 0) (d@r A1 24))
(j= %debug)
(movi d ($ header/true) A3)
%debug
(addr (d@r TASK %%task-header-offset) A1) ; root-process
(movi d ($ 4) NARGS) ; 3 args
(movi d (d@r P (static '*boot*)) P)
(movi d (d@r p 2) p)
(movi d (d@r P -2) TP)
(jump (@r TP))))
(define (call-fault-handler)
(lap (signal-handler)
(equate t-interrupt (fixnum-ashl 2 2)) ; UNIX signal codes
(equate t-virtual-timer (fixnum-ashl 26 2))
(movi d ($ t-interrupt) A1) ; signal code is arg 1
(tbiti b ($ 1) (d@r TASK (fx+ task/critical-count 3))) ; t-interrupt?
(jfs %call-fault) ; test F flag
(movi d ($ t-virtual-timer) A1)
%call-fault
(addr (d@r SP (fx+ 4 tag/extend)) A2) ; fault frame is arg 2
(movi d (d@r P (static 'signal-handler)) P)
(movi d (d@r p 2) p)
(movi d (d@r P -2) TP)
(movi b ($ 0) (d@r TASK (fx+ task/critical-count 3)))
(jump (@r TP))))
;;;; Various return points pushed as continuations by INTERRUPT_DISPATCHER
;;; Return from fault handler when originally interrupted in T code
(lap-template (0 0 -1 t stack %fault-frame-handler)
%fault-frame-template
(equate %%fault-sp-offset 20)
(equate %%df_r2 16)
(equate %%df_r3 -44)
(equate %%df_r4 -40)
(equate %%df_r5 -36)
(equate %%df_r6 -32)
(equate %%df_fp -28)
(equate %%df_pc 24)
(ori b ($ #b01000000) (d@r TASK (fx+ task/critical-count 3))) ; ignore int's
(movi d (d@r SP 4) S0) ; fault header
(ashi d ($ -8) S0)
(addi d ($ 2) S0) ; 2 for header and template
(cmpi d ($ 0) (d@r SP 12))
(j= foobar)
(movi d (d@r SP 12) (index-d (@r SP) S0)) ; restore hacked top of stack
foobar
(adjspi b ($ -16)) ; pop template, header, pointers on stack, hack top
;; 10 = 3 (extra p & s & task/scratch) + 6 (pointer regs) + 1 (pc)
(movi d (d@r SP (* (+ *pointer-temps* *scratch-temps* 10) 4))
A1) ; context. pushed in %fault-save-loop above
(movi d (tos) (d@r A1 %%df_pc))
(movi d (tos) (d@r A1 %%df_r2)) ; P
(movi d (tos) (d@r A1 %%df_r3)) ; A1
(movi d (tos) (d@r A1 %%df_r4)) ; A2
(movi d (tos) (d@r A1 %%df_r5)) ; A3
(movi d (tos) (d@r A1 %%df_r6)) ; AN
(movi d (tos) (d@r A1 %%df_fp)) ; TP
(movi d ($ -3) S0) ; extra p & s & task/scratch
%fault-restore-loop ; restore temps
(movi d (tos) (index-d (@r TASK) S0))
(addi d ($ 1) S0)
(cmpi d ($ (fx/ temp-block-size 4)) S0)
(j> %fault-restore-loop)
(adjspi b ($ -4)) ; pop context
(bici b ($ #b01000000) (d@r TASK (fx+ task/critical-count 3)))
(ret ($ 0))
%fault-frame-handler
(spri d nil-reg AN)
(ret ($ 0)))
;;; Return from fault handler when originally interrupted in foreign code
(lap-template (0 0 -1 nil stack handle-foreign-return)
%foreign-return
(ori b ($ #b01000000) (d@r TASK (fx+ task/critical-count 3))) ; ignore int's
(adjspi b ($ -8)) ; pop template,header
(movi d (tos) (d@r TASK task/foreign-call-cont))
(bici b ($ #b01000000) (d@r TASK (fx+ task/critical-count 3)))
(ret ($ 0))
handle-foreign-return
(spri d nil-reg AN)
(ret ($ 0)))
(lap-template (0 0 -1 nil stack handle-enable-return)
%re-enabled
(adjspi b ($ -4)) ; pop return address
(ret ($ 0))
handle-enable-return
(spri d nil-reg AN)
(ret ($ 0)))
(lap-template (0 0 -1 nil stack handle-doing-gc-return)
%doing-gc-return
(adjspi b ($ -4)) ; pop return address
(ret ($ 0))
handle-doing-gc-return
(spri d nil-reg AN)
(ret ($ 0)))
;;; This is T's fault handler, called by UNIX fault handler via
;;; assembly routine INTERRUPT_XENOID.
;;; S0 contains UNIX signal code
;;; A1 contains context
;;; Interrupts can be deferred.
;;; the task/critical count byte has
;;; bit 7 -- interrupts deferred
;;; bit 6 -- interrupts ignored
;;; bit 1 -- quit pending
;;; bit 0 -- timer interrupt pending
(define (interrupt_dispatcher)
(lap (signal-handler enable-signals gc_interrupt)
(equate %%fault-sp-offset 20)
(equate %%df_r2 16)
(equate %%df_r3 -44)
(equate %%df_r4 -40)
(equate %%df_r5 -36)
(equate %%df_r6 -32)
(equate %%df_fp -28)
(equate %%df_pc 24)
(equate fault-interrupt 2) ; UNIX signal codes
(equate fault-quit 3)
(equate fault-virtual-timer 26)
(movi d S0 A2) ; save signal code
; (movi d (d@r P (static '*the-slink*)) nil-reg)
(lpri d TASK (d@r nil-reg slink/current-task)) ; restore task
(tbiti b ($ 6) (d@r TASK (fx+ task/critical-count 3))) ; ignoring int's?
(jfs %ignore-interrupt) ; test F flag
(cmpi d ($ fault-virtual-timer) S0) ; timer interrupt?
(j= %timer)
(cmpi d ($ fault-interrupt) S0) ; is this a ^q?
(jn= %fault) ; if so ...
(cmpi d (d@r TASK task/doing-gc?) (d@r nil-reg slink/nil-car)) ; are we doing gc?
(jn= %doing-gc) ; if not ...
(cmpi b ($ 0) (d@r TASK task/foreign-call-cont))
(jn= %fault) ; if so ...
(tbiti b ($ 1) (d@r TASK (fx+ task/critical-count 3)))
(jfc %set-interrupt-flag)
(andi b ($ #b11111101) (d@r TASK (fx+ task/critical-count 3)))
(cmpi b ($ 0) (d@r TASK (fx+ task/critical-count 3)))
(j= %fault)
%set-interrupt-flag
(ori b ($ #b10) (d@r TASK (fx+ task/critical-count 3))) ; set "quit pending"
(jbr %ignore-interrupt)
%timer
(cmpi d (d@r TASK task/doing-gc?) (d@r nil-reg slink/nil-car)) ; are we doing gc?
(jn= %ignore-interrupt) ; if so, ignore int
(cmpi b ($ 0) (d@r TASK (fx+ task/critical-count 3))) ; are int's deferred?
(j= %fault) ; if so ...
(ori b ($ 1) (d@r TASK (fx+ task/critical-count 3))) ; set timer bit
%ignore-interrupt
(addr (label %re-enabled) (tos)) ; re-enable interrupts
(movi d (d@r P (static 'enable-signals)) P) ; DON'T CONS!!!
(movi d (d@r p 2) p)
(movi d (d@r P -2) TP)
(jump (@r TP))
%doing-gc
(addr (label %doing-gc-return) (tos))
(movi d (d@r P (static 'gc_interrupt)) P)
(movi d (d@r p 2) p)
(movi d (d@r P -2) TP)
(jump (@r TP))
;;; Interrupts are disabled here. (i.e. Signals are disabled at OS level)
%fault
(movi d (d@r TASK task/foreign-call-cont) S0)
(cmpi d ($ 0) S0)
(j= %t-code-interrupt)
;; Interrupted out of foreign code.
(movi d ($ 0) (d@r TASK task/foreign-call-cont))
(movi d S0 (tos)) ; push foreign continuation
(spri d SP AN) ; can't subtract directly...
(subi d AN S0) ; compute frame size
(ashi d ($ 6) S0) ; shift to byte 2
(movi b ($ (fx+ header/fault-frame 128)) S0) ; add header, foreign bit
(movi d S0 (tos)) ; push fault frame header
(addr (label %foreign-return) (tos)) ; push continuation
(jbr %fault-done)
;;; registers: use AN for fault-sp. Still have A1 = context
%t-code-interrupt
(movi d A1 (tos)) ; save context
(movi d (d@r A1 %%fault-sp-offset) AN) ; get fault SP in AN
(movi d ($ (fx/ (fx+ temp-block-size 8) 4)) S0)
%fault-save-loop ; save temps and extra p & s
(movi d (index-d (d@r TASK -12) S0) (tos)) ; and task/scratch
(subi d ($ 1) S0)
(cmpi d S0 ($ 0))
(j>= %fault-save-loop)
(movi d (d@r A1 %%df_fp) (tos)) ; TP (FP)
(movi d (d@r A1 %%df_r6) (tos)) ; AN (R6)
(movi d (d@r A1 %%df_r5) (tos)) ; A3 (R5)
(movi d (d@r A1 %%df_r4) (tos)) ; A2 (R4)
(movi d (d@r A1 %%df_r3) (tos)) ; A1 (R3)
(movi d (d@r A1 %%df_r2) (tos)) ; P (R2)
(movi d (d@r A1 %%df_pc) S0)
(movi d S0 (tos))
(cmpi d (d@r nil-reg slink/kernel-begin) S0)
(j> %not-in-kernel)
(cmpi d (d@r nil-reg slink/kernel-end) S0)
(j< %not-in-kernel)
(movi d (@r AN) (tos)) ; save hack top of stack
(movi d ($ 0) (tos)) ; # of pointers on stack was 0
(jbr %t-code-done)
%not-in-kernel
(movi d ($ 0) (tos)) ; no hacked stack top
;;; find how many pointers were top of stack at time of fault
;;; AN - sp at fault time
;;; S0 - search pointer
;;; A3 - next pointer slot from stack
;;; NARGS - temp
(movi d AN S0) ; start search at fault sp
%find-last-template-loop
(movi d (@r S0) A3) ; load next word
(addi d ($ 4) S0)
(cmpi b ($ header/vframe) A3) ; vframe?
(j= %found-frame) ; .. if so, done looking
(movi d A3 NARGS) ; copy for extend test
(andi b ($ #b11) NARGS)
(cmpi b ($ tag/extend) NARGS) ; extend?
(jn= %find-last-template-loop) ; .. if not, keep looking
(movi d (d@r A3 -2) nargs)
(andi b ($ #x7f) nargs)
(cmpi b ($ header/template) nargs) ; template?
(jn= %find-last-template-loop) ; .. if not, keep looking
%found-frame
(subi d AN S0) ; compute # of pointers (fixnum)
(subi d ($ 4) S0) ; (it was one too high)
(movi d S0 (tos)) ; and push on stack
%t-code-done
(spri d SP S0)
(subi d S0 AN) ; compute total size of frame (-)
(ashi d ($ 6) S0) ; move to byte 2
(movi b ($ header/fault-frame) S0) ; add header
(movi d S0 (tos)) ; push fault header
(addr (label %fault-frame-template) (tos)) ; continuation
%fault-done
(movi d A2 S0) ; restore UNIX signal code
(ashi d ($ 2) S0) ; fixnumize
(movi d S0 A1) ; 1st argument is signal code
(addr (d@r SP 6) A2) ; 2nd argument is frame
(movi d (d@r P (static 'signal-handler)) p)
(movi d (d@r p 2) p)
(movi d (d@r P -2) TP)
(jump (@r TP))
))
(define (local-machine)
(object nil
((machine-type self) 'max)
((machine-suspend-file self) '(link maxsuspend))
((page-size self) 2048) ;?????
((object-file-type self) 'no)
((information-file-type self) 'ni)
((noise-file-type self) 'nn)
((print-type-string self) "Machine")))
(define (nan? x) (ignore x) '#f)
(define (st_mtime stat-block)
(+ (ash (mref-16-u stat-block 34) 16)
(mref-16-u stat-block 32)))
(define-integrable (st_size stat-block)
(mref-integer stat-block 20))
(define-integrable (st_mode stat-block)
(mref-16-u stat-block 8))