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[unix-history] / usr / src / sys / vax / vax / locore.s
/* locore.s 4.74 82/12/09 */
#include "../vax/mtpr.h"
#include "../vax/trap.h"
#include "../h/psl.h"
#include "../h/pte.h"
#include "../vax/cpu.h"
#include "../vax/nexus.h"
#include "../vaxuba/ubareg.h"
#include "../vax/cons.h"
#include "../vax/clock.h"
#include "dz.h"
#include "mba.h"
.set HIGH,0x1f # mask for total disable
.set MCKVEC,4 # offset into scb of machine check vector
.set NBPG,512
.set PGSHIFT,9
.set NISP,3 # number of interrupt stack pages
/*
* User structure is UPAGES at top of user space.
*/
.globl _u
.set _u,0x80000000 - UPAGES*NBPG
/*
* Restart parameter block
* This is filled in in machdep.c in startup().
* It MUST be page aligned.
* When auto-restart occurs, we run restart() in machdep.c, which
* takes a core-dump and then cold-starts.
*/
.globl _rpb
_rpb:
.space 508
erpb:
.space 4
.globl _intstack
_intstack:
.space NISP*NBPG
eintstack:
/*
* Do a dump.
* Called by auto-restart.
* May be called manually.
*/
.align 2
.globl _doadump
_doadump:
nop; nop # .word 0x0101
#define _rpbmap _Sysmap+8 # scb, UNIvec, rpb, istack*4
bicl2 $PG_PROT,_rpbmap
bisl2 $PG_KW,_rpbmap
tstl _rpb+RP_FLAG # dump only once!
bneq 1f
incl _rpb+RP_FLAG
mtpr $0,$TBIA
movl sp,erpb
movab erpb,sp
mfpr $PCBB,-(sp)
mfpr $MAPEN,-(sp)
mfpr $IPL,-(sp)
mtpr $0,$MAPEN
mtpr $HIGH,$IPL
pushr $0x3fff
calls $0,_dumpsys
1:
mfpr $TXCS,r0
bitl $TXCS_RDY,r0
beql 1b
mtpr $TXDB_BOOT,$TXDB
halt
/*
* Interrupt vector routines
*/
.globl _waittime
#define SCBVEC(name) .align 2; .globl _X/**/name; _X/**/name
#define PANIC(msg) clrl _waittime; pushab 1f; \
calls $1,_panic; 1: .asciz msg
#define PRINTF(n,msg) pushab 1f; calls $n+1,_printf; MSG(msg)
#define MSG(msg) .data; 1: .asciz msg; .text
#define PUSHR pushr $0x3f
#define POPR popr $0x3f
SCBVEC(machcheck):
PUSHR; pushab 6*4(sp); calls $1,_machinecheck; POPR;
addl2 (sp)+,sp; rei
SCBVEC(kspnotval):
PUSHR; PANIC("KSP not valid");
SCBVEC(powfail):
halt
SCBVEC(chme): SCBVEC(chms): SCBVEC(chmu):
PUSHR; PANIC("CHM? in kernel");
SCBVEC(stray):
PUSHR; PRINTF(0, "stray scb interrupt\n"); POPR;
rei
SCBVEC(nexzvec):
PUSHR; mfpr $IPL,-(sp); PRINTF(1, "nexus stray intr ipl%x\n"); POPR; rei
SCBVEC(cmrd):
PUSHR; calls $0,_memerr; POPR; rei
SCBVEC(wtime):
PUSHR; pushl 6*4(sp); PRINTF(1,"write timeout %x\n"); POPR;
PANIC("wtimo");
#if NMBA > 0
SCBVEC(mba3int):
PUSHR; pushl $3; brb 1f
SCBVEC(mba2int):
PUSHR; pushl $2; brb 1f
SCBVEC(mba1int):
PUSHR; pushl $1; brb 1f
SCBVEC(mba0int):
PUSHR; pushl $0
1: calls $1,_mbintr
POPR
incl _cnt+V_INTR
rei
#endif
#if VAX780
/*
* Registers for the uba handling code
*/
#define rUBANUM r0
#define rUBAHD r1
#define rUVEC r3
#define rUBA r4
/* r2,r5 are scratch */
SCBVEC(ua3int):
PUSHR; movl $3,rUBANUM; moval _uba_hd+(3*UH_SIZE),rUBAHD; brb 1f
SCBVEC(ua2int):
PUSHR; movl $2,rUBANUM; moval _uba_hd+(2*UH_SIZE),rUBAHD; brb 1f
SCBVEC(ua1int):
PUSHR; movl $1,rUBANUM; moval _uba_hd+(1*UH_SIZE),rUBAHD; brb 1f
SCBVEC(ua0int):
PUSHR; movl $0,rUBANUM; moval _uba_hd+(0*UH_SIZE),rUBAHD;
1:
incl _cnt+V_INTR
mfpr $IPL,r2 /* r2 = mfpr(IPL); */
movl UH_UBA(rUBAHD),rUBA /* uba = uhp->uh_uba; */
movl UBA_BRRVR-0x14*4(rUBA)[r2],rUVEC
/* uvec = uba->uba_brrvr[r2-0x14] */
ubanorm:
bleq ubaerror
addl2 UH_VEC(rUBAHD),rUVEC /* uvec += uh->uh_vec */
bicl3 $3,(rUVEC),r1
jmp 2(r1) /* 2 skips ``pushr $0x3f'' */
ubaerror:
PUSHR; calls $0,_ubaerror; POPR /* ubaerror r/w's r0-r5 */
tstl rUVEC; jneq ubanorm /* rUVEC contains result */
POPR
rei
#endif
SCBVEC(cnrint):
PUSHR; calls $0,_cnrint; POPR; incl _cnt+V_INTR; rei
SCBVEC(cnxint):
PUSHR; calls $0,_cnxint; POPR; incl _cnt+V_INTR; rei
SCBVEC(hardclock):
PUSHR
mtpr $ICCS_RUN|ICCS_IE|ICCS_INT|ICCS_ERR,$ICCS
pushl 4+6*4(sp); pushl 4+6*4(sp);
calls $2,_hardclock # hardclock(pc,psl)
#if NPS > 0
pushl 4+6*4(sp); pushl 4+6*4(sp);
calls $2,_psextsync
#endif
POPR;
incl _cnt+V_INTR ## temp so not to break vmstat -= HZ
rei
SCBVEC(softclock):
PUSHR
#if NDZ > 0
calls $0,_dztimer
#endif
#if NDH > 0
calls $0,_dhtimer
#endif
pushl 4+6*4(sp); pushl 4+6*4(sp);
calls $2,_softclock # softclock(pc,psl)
POPR;
rei
#include "../net/netisr.h"
.globl _netisr
SCBVEC(netintr):
PUSHR
bbcc $NETISR_RAW,_netisr,1f; calls $0,_rawintr; 1:
#ifdef INET
#include "../netinet/in_systm.h"
bbcc $NETISR_IP,_netisr,1f; calls $0,_ipintr; 1:
#endif
#ifdef NS
bbcc $NETISR_NS,_netisr,1f; calls $0,_nsintr; 1:
#endif
POPR
rei
#if defined(VAX750) || defined(VAX730)
SCBVEC(consdin):
PUSHR; calls $0,_turintr; POPR; incl _cnt+V_INTR; rei
SCBVEC(consdout):
PUSHR; calls $0,_tuxintr; POPR; incl _cnt+V_INTR; rei
#else
SCBVEC(consdin):
halt
SCBVEC(consdout):
halt
#endif
#if NDZ > 0
/*
* DZ pseudo dma routine:
* r0 - controller number
*/
.align 1
.globl _dzdma
_dzdma:
mull2 $8*20,r0
movab _dzpdma(r0),r3 # pdma structure base
# for this controller
dzploop:
movl r3,r0
movl (r0)+,r1 # device register address
movzbl 1(r1),r2 # get line number
bitb $0x80,r2 # TRDY on?
beql dzprei # no
bicb2 $0xf8,r2 # clear garbage bits
mull2 $20,r2
addl2 r2,r0 # point at line's pdma structure
movl (r0)+,r2 # p_mem
cmpl r2,(r0)+ # p_mem < p_end ?
bgequ dzpcall # no, go call dzxint
movb (r2)+,6(r1) # dztbuf = *p_mem++
movl r2,-8(r0)
brb dzploop # check for another line
dzprei:
POPR
incl _cnt+V_PDMA
rei
dzpcall:
pushl r3
pushl (r0)+ # push tty address
calls $1,*(r0) # call interrupt rtn
movl (sp)+,r3
brb dzploop # check for another line
#endif
/*
* Stray UNIBUS interrupt catch routines
*/
.data
.align 2
#define PJ PUSHR;jsb _Xustray
.globl _catcher
_catcher:
PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ
PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ
PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ
PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ
PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ
PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ
PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ
PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ;PJ
.globl _cold
_cold: .long 1
.data
.text
SCBVEC(ustray):
blbc _cold,1f
mfpr $IPL,r11
subl3 $_catcher+8,(sp)+,r10
ashl $-1,r10,r10
POPR
rei
1:
subl3 $_catcher+8,(sp)+,r0
ashl $-1,r0,-(sp)
mfpr $IPL,-(sp)
PRINTF(2, "uba?: stray intr ipl %x vec %o\n")
POPR
rei
/*
* Trap and fault vector routines
*/
#define TRAP(a) pushl $T_/**/a; jbr alltraps
/*
* Ast delivery (profiling and/or reschedule)
*/
SCBVEC(astflt):
pushl $0; TRAP(ASTFLT)
SCBVEC(privinflt):
pushl $0; TRAP(PRIVINFLT)
SCBVEC(xfcflt):
pushl $0; TRAP(XFCFLT)
SCBVEC(resopflt):
pushl $0; TRAP(RESOPFLT)
SCBVEC(resadflt):
pushl $0; TRAP(RESADFLT)
SCBVEC(bptflt):
pushl $0; TRAP(BPTFLT)
SCBVEC(compatflt):
TRAP(COMPATFLT);
SCBVEC(tracep):
pushl $0; TRAP(TRCTRAP)
SCBVEC(arithtrap):
TRAP(ARITHTRAP)
SCBVEC(protflt):
blbs (sp)+,segflt
TRAP(PROTFLT)
segflt:
TRAP(SEGFLT)
SCBVEC(transflt):
bitl $2,(sp)+
bnequ tableflt
TRAP(PAGEFLT)
tableflt:
TRAP(TABLEFLT)
alltraps:
mfpr $USP,-(sp); calls $0,_trap; mtpr (sp)+,$USP
incl _cnt+V_TRAP
addl2 $8,sp # pop type, code
mtpr $HIGH,$IPL ## dont go to a higher IPL (GROT)
rei
SCBVEC(syscall):
pushl $T_SYSCALL
mfpr $USP,-(sp); calls $0,_syscall; mtpr (sp)+,$USP
incl _cnt+V_SYSCALL
addl2 $8,sp # pop type, code
mtpr $HIGH,$IPL ## dont go to a higher IPL (GROT)
rei
/*
* System page table
*/
#define vaddr(x) ((((x)-_Sysmap)/4)*NBPG+0x80000000)
#define SYSMAP(mname, vname, npte) \
_/**/mname: .globl _/**/mname; \
.space npte*4; \
.globl _/**/vname; \
.set _/**/vname,vaddr(_/**/mname)
.data
.align 2
SYSMAP(Sysmap ,Sysbase ,SYSPTSIZE )
SYSMAP(UMBAbeg ,umbabeg ,0 )
SYSMAP(Nexmap ,nexus ,16*MAXNNEXUS )
SYSMAP(UMEMmap ,umem ,512*MAXNUBA )
SYSMAP(UMBAend ,umbaend ,0 )
SYSMAP(Usrptmap ,usrpt ,USRPTSIZE )
SYSMAP(Forkmap ,forkutl ,UPAGES )
SYSMAP(Xswapmap ,xswaputl ,UPAGES )
SYSMAP(Xswap2map,xswap2utl ,UPAGES )
SYSMAP(Swapmap ,swaputl ,UPAGES )
SYSMAP(Pushmap ,pushutl ,UPAGES )
SYSMAP(Vfmap ,vfutl ,UPAGES )
SYSMAP(CMAP1 ,CADDR1 ,1 )
SYSMAP(CMAP2 ,CADDR2 ,1 )
SYSMAP(mcrmap ,mcr ,1 )
SYSMAP(mmap ,vmmap ,1 )
SYSMAP(msgbufmap,msgbuf ,MSGBUFPTECNT )
SYSMAP(camap ,cabase ,16*CLSIZE )
SYSMAP(ecamap ,calimit ,0 )
SYSMAP(Mbmap ,mbutl ,NMBCLUSTERS*CLSIZE)
eSysmap:
.globl _Syssize
.set _Syssize,(eSysmap-_Sysmap)/4
.text
/*
* Initialization
*
* ipl 0x1f; mapen 0; scbb, pcbb, sbr, slr, isp, ksp not set
*/
.data
.globl _cpu
_cpu: .long 0
.text
.globl start
start:
.word 0
/* set system control block base and system page table params */
mtpr $_scb-0x80000000,$SCBB
mtpr $_Sysmap-0x80000000,$SBR
mtpr $_Syssize,$SLR
/* double map the kernel into the virtual user addresses of phys mem */
mtpr $_Sysmap,$P0BR
mtpr $_Syssize,$P0LR
/* set ISP and get cpu type */
movl $_intstack+NISP*NBPG,sp
mfpr $SID,r0
movab _cpu,r1
extzv $24,$8,r0,(r1)
/* init RPB */
movab _rpb,r0
movl r0,(r0)+ # rp_selfref
movab _doadump,r1
movl r1,(r0)+ # rp_dumprout
movl $0x1f,r2
clrl r3
1: addl2 (r1)+,r3; sobgtr r2,1b
movl r3,(r0)+ # rp_chksum
/* count up memory */
clrl r7
1: pushl $4; pushl r7; calls $2,_badaddr; tstl r0; bneq 9f
acbl $8192*1024-1,$64*1024,r7,1b
9:
/* clear memory from kernel bss and pages for proc 0 u. and page table */
movab _edata,r6
movab _end,r5
bbcc $31,r5,0f; 0:
addl2 $(UPAGES*NBPG)+NBPG+NBPG,r5
1: clrq (r6); acbl r5,$8,r6,1b
/* trap() and syscall() save r0-r11 in the entry mask (per ../h/reg.h) */
bisw2 $0x0fff,_trap
bisw2 $0x0fff,_syscall
calls $0,_fixctlrmask
/* initialize system page table: scb and int stack writeable */
clrl r2
movab eintstack,r1; bbcc $31,r1,0f; 0: ashl $-PGSHIFT,r1,r1
1: bisl3 $PG_V|PG_KW,r2,_Sysmap[r2]; aoblss r1,r2,1b
/* make rpb read-only as red zone for interrupt stack */
bicl2 $PG_PROT,_rpbmap
bisl2 $PG_KR,_rpbmap
/* make kernel text space read-only */
movab _etext+NBPG-1,r1; bbcc $31,r1,0f; 0: ashl $-PGSHIFT,r1,r1
1: bisl3 $PG_V|PG_KR,r2,_Sysmap[r2]; aoblss r1,r2,1b
/* make kernel data, bss, read-write */
movab _end+NBPG-1,r1; bbcc $31,r1,0f; 0:; ashl $-PGSHIFT,r1,r1
1: bisl3 $PG_V|PG_KW,r2,_Sysmap[r2]; aoblss r1,r2,1b
/* now go to mapped mode */
mtpr $1,$TBIA; mtpr $1,$MAPEN; jmp *$0f; 0:
/* init mem sizes */
ashl $-PGSHIFT,r7,_maxmem
movl _maxmem,_physmem
movl _maxmem,_freemem
/* setup context for proc[0] == Scheduler */
movab _end+NBPG-1,r6
bicl2 $NBPG-1,r6 # make page boundary
/* setup page table for proc[0] */
bbcc $31,r6,0f; 0:
ashl $-PGSHIFT,r6,r3 # r3 = btoc(r6)
bisl3 $PG_V|PG_KW,r3,_Usrptmap # init first upt entry
incl r3
movab _usrpt,r0
mtpr r0,$TBIS
/* init p0br, p0lr */
mtpr r0,$P0BR
mtpr $0,$P0LR
/* init p1br, p1lr */
movab NBPG(r0),r0
movl $0x200000-UPAGES,r1
mtpr r1,$P1LR
mnegl r1,r1
moval -4*UPAGES(r0)[r1],r2
mtpr r2,$P1BR
/* setup mapping for UPAGES of _u */
movl $UPAGES,r2; movab _u+NBPG*UPAGES,r1; addl2 $UPAGES,r3; jbr 2f
1: decl r3
moval -NBPG(r1),r1;
bisl3 $PG_V|PG_URKW,r3,-(r0)
mtpr r1,$TBIS
2: sobgeq r2,1b
/* initialize (slightly) the pcb */
movab UPAGES*NBPG(r1),PCB_KSP(r1)
mnegl $1,PCB_ESP(r1)
mnegl $1,PCB_SSP(r1)
movl r1,PCB_USP(r1)
mfpr $P0BR,PCB_P0BR(r1)
mfpr $P0LR,PCB_P0LR(r1)
movb $4,PCB_P0LR+3(r1) # disable ast
mfpr $P1BR,PCB_P1BR(r1)
mfpr $P1LR,PCB_P1LR(r1)
movl $CLSIZE,PCB_SZPT(r1) # init u.u_pcb.pcb_szpt
movl r11,PCB_R11(r1)
movab 1f,PCB_PC(r1) # initial pc
clrl PCB_PSL(r1) # mode(k,k), ipl=0
ashl $PGSHIFT,r3,r3
mtpr r3,$PCBB # first pcbb
/* set regs, p0br, p0lr, p1br, p1lr, astlvl, ksp and change to kernel mode */
ldpctx
rei
/* put signal trampoline code in u. area */
1: movab _u,r0
movc3 $12,sigcode,PCB_SIGC(r0)
/* save reboot flags in global _boothowto */
movl r11,_boothowto
/* calculate firstaddr, and call main() */
movab _end+NBPG-1,r0; bbcc $31,r0,0f; 0:; ashl $-PGSHIFT,r0,-(sp)
addl2 $UPAGES+1,(sp); calls $1,_main
/* proc[1] == /etc/init now running here; run icode */
pushl $PSL_CURMOD|PSL_PRVMOD; pushl $0; rei
/* signal trampoline code: it is known that this code takes exactly 12 bytes */
/* in ../h/pcb.h and in the movc3 above */
sigcode:
calls $3,1(pc)
rei
.word 0x7f # registers 0-6 (6==sp/compat)
callg (ap),*12(ap)
ret
/*
* Primitives
*/
/*
* badaddr(addr, len)
* see if access addr with a len type instruction causes a machine check
* len is length of access (1=byte, 2=short, 4=long)
*/
.globl _badaddr
_badaddr:
.word 0
movl $1,r0
mfpr $IPL,r1
mtpr $HIGH,$IPL
movl _scb+MCKVEC,r2
movl 4(ap),r3
movl 8(ap),r4
movab 9f+INTSTK,_scb+MCKVEC
bbc $0,r4,1f; tstb (r3)
1: bbc $1,r4,1f; tstw (r3)
1: bbc $2,r4,1f; tstl (r3)
1: clrl r0 # made it w/o machine checks
2: movl r2,_scb+MCKVEC
mtpr r1,$IPL
ret
.align 2
9:
casel _cpu,$1,$VAX_MAX
0:
.word 8f-0b # 1 is 780
.word 5f-0b # 2 is 750
.word 5f-0b # 3 is 730
5:
#if defined(VAX750) || defined(VAX730)
mtpr $0xf,$MCESR
#endif
brb 1f
8:
#if VAX780
mtpr $0,$SBIFS
#endif
1:
addl2 (sp)+,sp # discard mchchk trash
movab 2b,(sp)
rei
_addupc: .globl _addupc
.word 0x0
movl 8(ap),r2 # &u.u_prof
subl3 8(r2),4(ap),r0 # corrected pc
blss 9f
extzv $1,$31,r0,r0 # logical right shift
extzv $1,$31,12(r2),r1 # ditto for scale
emul r1,r0,$0,r0
ashq $-14,r0,r0
tstl r1
bneq 9f
incl r0
bicl2 $1,r0
cmpl r0,4(r2) # length
bgequ 9f
addl2 (r2),r0 # base
probew $3,$2,(r0)
beql 8f
addw2 12(ap),(r0)
9:
ret
8:
clrl 12(r2)
ret
_Copyin: .globl _Copyin # <<<massaged for jsb by asm.sed>>>
movl 12(sp),r0 # copy length
blss ersb
movl 4(sp),r1 # copy user address
cmpl $NBPG,r0 # probing one page or less ?
bgeq cishort # yes
ciloop:
prober $3,$NBPG,(r1) # bytes accessible ?
beql ersb # no
addl2 $NBPG,r1 # incr user address ptr
acbl $NBPG+1,$-NBPG,r0,ciloop # reduce count and loop
cishort:
prober $3,r0,(r1) # bytes accessible ?
beql ersb # no
movl 4(sp),r1
movl 8(sp),r3
jbr 2f
1:
subl2 r0,12(sp)
movc3 r0,(r1),(r3)
2:
movzwl $65535,r0
cmpl 12(sp),r0
jgtr 1b
movc3 12(sp),(r1),(r3)
clrl r0 #redundant
rsb
ersb:
mnegl $1,r0
rsb
_Copyout: .globl _Copyout # <<<massaged for jsb by asm.sed >>>
movl 12(sp),r0 # get count
blss ersb
movl 8(sp),r1 # get user address
cmpl $NBPG,r0 # can do in one probew?
bgeq coshort # yes
coloop:
probew $3,$NBPG,(r1) # bytes accessible?
beql ersb # no
addl2 $NBPG,r1 # increment user address
acbl $NBPG+1,$-NBPG,r0,coloop # reduce count and loop
coshort:
probew $3,r0,(r1) # bytes accessible?
beql ersb # no
movl 4(sp),r1
movl 8(sp),r3
jbr 2f
1:
subl2 r0,12(sp)
movc3 r0,(r1),(r3)
2:
movzwl $65535,r0
cmpl 12(sp),r0
jgtr 1b
movc3 12(sp),(r1),(r3)
clrl r0 #redundant
rsb
/*
* non-local goto's
*/
.globl _Setjmp
_Setjmp:
movq r6,(r0)+
movq r8,(r0)+
movq r10,(r0)+
movq r12,(r0)+
addl3 $4,sp,(r0)+
movl (sp),(r0)
clrl r0
rsb
.globl _Longjmp
_Longjmp:
movq (r0)+,r6
movq (r0)+,r8
movq (r0)+,r10
movq (r0)+,r12
movl (r0)+,r1
cmpl r1,sp # must be a pop
bgequ lj2
pushab lj1
calls $1,_panic
lj2:
movl r1,sp
jmp *(r0) # ``rsb''
lj1: .asciz "longjmp"
.globl _whichqs
.globl _qs
.globl _cnt
.globl _noproc
.comm _noproc,4
.globl _runrun
.comm _runrun,4
/*
* The following primitives use the fancy VAX instructions
* much like VMS does. _whichqs tells which of the 32 queues _qs
* have processes in them. Setrq puts processes into queues, Remrq
* removes them from queues. The running process is on no queue,
* other processes are on a queue related to p->p_pri, divided by 4
* actually to shrink the 0-127 range of priorities into the 32 available
* queues.
*/
/*
* Setrq(p), using fancy VAX instructions.
*
* Call should be made at spl6(), and p->p_stat should be SRUN
*/
.globl _Setrq # <<<massaged to jsb by "asm.sed">>>
_Setrq:
tstl P_RLINK(r0) ## firewall: p->p_rlink must be 0
beql set1 ##
pushab set3 ##
calls $1,_panic ##
set1:
movzbl P_PRI(r0),r1 # put on queue which is p->p_pri / 4
ashl $-2,r1,r1
movaq _qs[r1],r2
insque (r0),*4(r2) # at end of queue
bbss r1,_whichqs,set2 # mark queue non-empty
set2:
rsb
set3: .asciz "setrq"
/*
* Remrq(p), using fancy VAX instructions
*
* Call should be made at spl6().
*/
.globl _Remrq # <<<massaged to jsb by "asm.sed">>>
_Remrq:
movzbl P_PRI(r0),r1
ashl $-2,r1,r1
bbsc r1,_whichqs,rem1
pushab rem3 # it wasn't recorded to be on its q
calls $1,_panic
rem1:
remque (r0),r2
beql rem2
bbss r1,_whichqs,rem2
rem2:
clrl P_RLINK(r0) ## for firewall checking
rsb
rem3: .asciz "remrq"
/*
* Masterpaddr is the p->p_addr of the running process on the master
* processor. When a multiprocessor system, the slave processors will have
* an array of slavepaddr's.
*/
.globl _masterpaddr
.data
_masterpaddr:
.long 0
.text
sw0: .asciz "swtch"
/*
* Swtch(), using fancy VAX instructions
*/
.globl _Swtch
_Swtch: # <<<massaged to jsb by "asm.sed">>>
movl $1,_noproc
clrl _runrun
sw1: ffs $0,$32,_whichqs,r0 # look for non-empty queue
bneq sw1a
mtpr $0,$IPL # must allow interrupts here
jbr sw1 # this is an idle loop!
sw1a: mtpr $0x18,$IPL # lock out all so _whichqs==_qs
bbcc r0,_whichqs,sw1 # proc moved via lbolt interrupt
movaq _qs[r0],r1
remque *(r1),r2 # r2 = p = highest pri process
bvc sw2 # make sure something was there
sw1b: pushab sw0
calls $1,_panic
sw2: beql sw3
insv $1,r0,$1,_whichqs # still more procs in this queue
sw3:
clrl _noproc
tstl P_WCHAN(r2) ## firewalls
bneq sw1b ##
movzbl P_STAT(r2),r3 ##
cmpl $SRUN,r3 ##
bneq sw1b ##
clrl P_RLINK(r2) ##
movl *P_ADDR(r2),r0
movl r0,_masterpaddr
ashl $PGSHIFT,r0,r0 # r0 = pcbb(p)
/* mfpr $PCBB,r1 # resume of current proc is easy
* cmpl r0,r1
*/ beql res0
incl _cnt+V_SWTCH
/* fall into... */
/*
* Resume(pf)
*/
.globl _Resume # <<<massaged to jsb by "asm.sed">>>
_Resume:
mtpr $0x18,$IPL # no interrupts, please
movl _CMAP2,_u+PCB_CMAP2 # yech
svpctx
mtpr r0,$PCBB
ldpctx
movl _u+PCB_CMAP2,_CMAP2 # yech
mtpr $_CADDR2,$TBIS
res0:
tstl _u+PCB_SSWAP
beql res1
movl _u+PCB_SSWAP,r0
clrl _u+PCB_SSWAP
movab _Longjmp,(sp)
movl $PSL_PRVMOD,4(sp) # ``cheating'' (jfr)
res1:
rei
/*
* {fu,su},{byte,word}, all massaged by asm.sed to jsb's
*/
.globl _Fuword
_Fuword:
prober $3,$4,(r0)
beql fserr
movl (r0),r0
rsb
fserr:
mnegl $1,r0
rsb
.globl _Fubyte
_Fubyte:
prober $3,$1,(r0)
beql fserr
movzbl (r0),r0
rsb
.globl _Suword
_Suword:
probew $3,$4,(r0)
beql fserr
movl r1,(r0)
clrl r0
rsb
.globl _Subyte
_Subyte:
probew $3,$1,(r0)
beql fserr
movb r1,(r0)
clrl r0
rsb
/*
* Copy 1 relocation unit (NBPG bytes)
* from user virtual address to physical address
*/
_copyseg: .globl _copyseg
.word 0x0
bisl3 $PG_V|PG_KW,8(ap),_CMAP2
mtpr $_CADDR2,$TBIS # invalidate entry for copy
movc3 $NBPG,*4(ap),_CADDR2
ret
/*
* zero out physical memory
* specified in relocation units (NBPG bytes)
*/
_clearseg: .globl _clearseg
.word 0x0
bisl3 $PG_V|PG_KW,4(ap),_CMAP1
mtpr $_CADDR1,$TBIS
movc5 $0,(sp),$0,$NBPG,_CADDR1
ret
/*
* Check address.
* Given virtual address, byte count, and rw flag
* returns 0 on no access.
*/
_useracc: .globl _useracc
.word 0x0
movl 4(ap),r0 # get va
movl 8(ap),r1 # count
tstl 12(ap) # test for read access ?
bneq userar # yes
cmpl $NBPG,r1 # can we do it in one probe ?
bgeq uaw2 # yes
uaw1:
probew $3,$NBPG,(r0)
beql uaerr # no access
addl2 $NBPG,r0
acbl $NBPG+1,$-NBPG,r1,uaw1
uaw2:
probew $3,r1,(r0)
beql uaerr
movl $1,r0
ret
userar:
cmpl $NBPG,r1
bgeq uar2
uar1:
prober $3,$NBPG,(r0)
beql uaerr
addl2 $NBPG,r0
acbl $NBPG+1,$-NBPG,r1,uar1
uar2:
prober $3,r1,(r0)
beql uaerr
movl $1,r0
ret
uaerr:
clrl r0
ret
/*
* kernacc - check for kernel access privileges
*
* We can't use the probe instruction directly because
* it ors together current and previous mode.
*/
.globl _kernacc
_kernacc:
.word 0x0
movl 4(ap),r0 # virtual address
bbcc $31,r0,kacc1
bbs $30,r0,kacerr
mfpr $SBR,r2 # address and length of page table (system)
bbss $31,r2,0f; 0:
mfpr $SLR,r3
brb kacc2
kacc1:
bbsc $30,r0,kacc3
mfpr $P0BR,r2 # user P0
mfpr $P0LR,r3
brb kacc2
kacc3:
mfpr $P1BR,r2 # user P1 (stack)
mfpr $P1LR,r3
kacc2:
addl3 8(ap),r0,r1 # ending virtual address
addl2 $NBPG-1,r1
ashl $-PGSHIFT,r0,r0
ashl $-PGSHIFT,r1,r1
bbs $31,4(ap),kacc6
bbc $30,4(ap),kacc6
cmpl r0,r3 # user stack
blss kacerr # address too low
brb kacc4
kacc6:
cmpl r1,r3 # compare last page to P0LR or SLR
bgtr kacerr # address too high
kacc4:
movl (r2)[r0],r3
bbc $31,4(ap),kacc4a
bbc $31,r3,kacerr # valid bit is off
kacc4a:
cmpzv $27,$4,r3,$1 # check protection code
bleq kacerr # no access allowed
tstb 12(ap)
bneq kacc5 # only check read access
cmpzv $27,$2,r3,$3 # check low 2 bits of prot code
beql kacerr # no write access
kacc5:
aoblss r1,r0,kacc4 # next page
movl $1,r0 # no errors
ret
kacerr:
clrl r0 # error
ret
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.