/* $OpenBSD: locore.s,v 1.53 2006/07/03 18:55:36 miod Exp $ */ /* * Copyright (c) 1995 Theo de Raadt * Copyright (c) 1999 Steve Murphree, Jr. (68060 support) * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Copyright (c) 1988 University of Utah. * Copyright (c) 1980, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Utah $Hdr: locore.s 1.66 92/12/22$ * * @(#)locore.s 8.6 (Berkeley) 5/27/94 */ #include "assym.h" #include "ksyms.h" #include #include #include /* * Relocate a symbol, used before MMU is enabled. */ #define _RELOC(var, ar) \ lea var,ar #define RELOC(var, ar) _RELOC(_C_LABEL(var), ar) #define ASRELOC(var, ar) _RELOC(_ASM_LABEL(var), ar) /* * Invoke a BUG routine. */ #define BUGCALL(id) \ trap #15; \ .short id /* * Temporary stack for a variety of purposes. * Try and make this the first thing is the data segment so it * is page aligned. Note that if we overflow here, we run into * our text segment. */ .data .space NBPG ASLOCAL(tmpstk) /* * Initialization * * The bootstrap loader loads us in starting at 0, and VBR is non-zero. * On entry, args on stack are boot device, boot filename, console unit, * boot flags (howto), boot device name, filesystem type name. */ BSS(esym, 4) BSS(emini, 4) BSS(smini, 4) BSS(promvbr, 4) BSS(promcall, 4) .text /* GLOBAL(edata) GLOBAL(etext) GLOBAL(end) */ GLOBAL(kernel_text) ASENTRY_NOPROFILE(start) movw #PSL_HIGHIPL,sr | no interrupts movl sp@(4), d7 | get boothowto movl sp@(8), d6 | get bootaddr movl sp@(12),d5 | get bootctrllun movl sp@(16),d4 | get bootdevlun movl sp@(20),d3 | get bootpart movl sp@(24),d2 | get esyms /* note: d2-d7 in use */ ASRELOC(tmpstk, a0) movl a0,sp | give ourselves a temporary stack RELOC(edata, a0) | clear out BSS movl #_C_LABEL(end)-4,d0 | (must be <= 256 kB) subl #_C_LABEL(edata),d0 lsrl #2,d0 1: clrl a0@+ dbra d0,1b movc vbr,d0 | save prom's trap #15 vector RELOC(promvbr, a0) movl d0, a0@ RELOC(esym, a0) movl d2,a0@ | store end of symbol table /* note: d2 now free, d3-d7 still in use */ clrl sp@- BUGCALL(MVMEPROM_GETBRDID) movl sp@+, a1 movl #SIZEOF_MVMEPROM_BRDID, d0 | copy to local variables RELOC(brdid, a0) 1: movb a1@+, a0@+ subql #1, d0 bne 1b clrl d0 RELOC(brdid, a1) movw a1@(MVMEPROM_BRDID_MODEL), d0 RELOC(cputyp, a0) movl d0, a0@ | init _cputyp #ifdef MVME147 cmpw #CPU_147, d0 beq is147 #endif #ifdef MVME162 cmpw #CPU_162, d0 beq is162 #endif #ifdef MVME167 cmpw #CPU_166, d0 beq is167 cmpw #CPU_167, d0 beq is167 #endif #ifdef MVME177 #ifdef notyet cmpw #CPU_176, d0 beq is177 #endif cmpw #CPU_177, d0 beq is177 #endif #ifdef MVME172 cmpw #CPU_172, d0 beq is172 #endif .data notsup: .asciz "kernel does not support this model." notsupend: .even .text | first we bitch, then we die. movl #notsupend, sp@- movl #notsup, sp@- BUGCALL(MVMEPROM_OUTSTRCRLF) addql #8,sp BUGCALL(MVMEPROM_EXIT) | return to m68kbug /*NOTREACHED*/ #ifdef MVME147 is147: RELOC(mmutype, a0) | no, we have 68030 movl #MMU_68030,a0@ | set to reflect 68030 PMMU RELOC(cputype, a0) | no, we have 68030 movl #CPU_68030,a0@ | set to reflect 68030 CPU movl #CACHE_OFF,d0 movc d0,cacr | clear and disable on-chip cache(s) movb #0, 0xfffe1026 | XXX serial interrupt off movb #0, 0xfffe1018 | XXX timer 1 off movb #0, 0xfffe1028 | XXX ethernet off movl #0xfffe0000, a0 | mvme147 nvram base | move nvram component of etheraddr (only last 3 bytes) RELOC(myea, a1) movw a0@(NVRAM_147_ETHER+0), a1@(3+0) movb a0@(NVRAM_147_ETHER+2), a1@(3+2) movl a0@(NVRAM_147_EMEM), d1 | pass memory size RELOC(iiomapsize, a1) movl #INTIOSIZE_147, a1@ RELOC(iiomapbase, a1) movl #INTIOBASE_147, a1@ bra Lstart1 #endif #ifdef MVME162 is162: #if 0 | the following 3 things are "just in case". they won't make | the kernel work properly, but they will at least let it get | far enough that you can figure out that something had an | interrupt pending. which the bootrom shouldn't allow, i don't | think.. clrb 0xfff42002 | XXX MCchip irq off clrl 0xfff42018 | XXX MCchip timers irq off clrb 0xfff4201d | XXX MCchip scc irq off #endif RELOC(memsize162, a1) | how much memory? jbsr a1@ movl d0, d2 RELOC(mmutype, a0) movl #MMU_68040,a0@ | with a 68040 MMU RELOC(cputype, a0) | no, we have 68040 movl #CPU_68040,a0@ | set to reflect 68040 CPU RELOC(fputype, a0) movl #FPU_68040,a0@ | and a 68040 FPU RELOC(vectab, a1) movl #_C_LABEL(buserr40),a1@(8) movl #_C_LABEL(addrerr4060),a1@(12) bra is16x #endif #ifdef MVME167 is167: RELOC(memsize1x7, a1) | how much memory? jbsr a1@ RELOC(mmutype, a0) movl #MMU_68040,a0@ | with a 68040 MMU RELOC(cputype, a0) | no, we have 68040 movl #CPU_68040,a0@ | set to reflect 68040 CPU RELOC(fputype, a0) movl #FPU_68040,a0@ | and a 68040 FPU RELOC(vectab, a1) movl #_C_LABEL(buserr40),a1@(8) movl #_C_LABEL(addrerr4060),a1@(12) bra is16x #endif #ifdef MVME172 is172: RELOC(memsize162, a1) | how much memory? jbsr a1@ movl d0, d2 /* enable Super Scalar Dispatch */ .word 0x4e7a,0x0808 | movc pcr,d0 bset #0,d0 | turn on bit 0. .word 0x4e7b,0x0808 | movc d0,pcr Bang! RELOC(mmutype, a0) movl #MMU_68060,a0@ | with a 68060 MMU RELOC(cputype, a0) | no, we have 68060 movl #CPU_68060,a0@ | set to reflect 68060 CPU RELOC(fputype, a0) movl #FPU_68060,a0@ | and a 68060 FPU RELOC(vectab, a1) movl #_C_LABEL(buserr60),a1@(8) movl #_C_LABEL(addrerr4060),a1@(12) bra is16x #endif #ifdef MVME177 is177: RELOC(memsize1x7, a1) | how much memory? jbsr a1@ /* enable Super Scalar Dispatch */ .word 0x4e7a,0x0808 | movc pcr,d0 bset #0,d0 | turn on bit 0. .word 0x4e7b,0x0808 | movc d0,pcr Bang! We are smokin' ! RELOC(mmutype, a0) movl #MMU_68060,a0@ | with a 68060 MMU RELOC(cputype, a0) | no, we have 68060 movl #CPU_68060,a0@ | set to reflect 68060 CPU RELOC(fputype, a0) movl #FPU_68060,a0@ | and a 68060 FPU RELOC(vectab, a1) movl #_C_LABEL(buserr60),a1@(8) movl #_C_LABEL(addrerr4060),a1@(12) bra is16x #endif #if defined(MVME162) || defined(MVME167) || defined(MVME177) || defined(MVME172) #define ROMPKT_LEN 200 BSS(rompkt, ROMPKT_LEN) .even .text is16x: RELOC(iiomapsize, a1) movl #INTIOSIZE_162, a1@ RELOC(iiomapbase, a1) movl #INTIOBASE_162, a1@ /* get ethernet address */ RELOC(rompkt, a0) | build a .NETCTRL packet movb #0, a0@(NETCTRL_DEV) | onboard ethernet movb #0, a0@(NETCTRL_CTRL) | onboard ethernet movl #NETCTRLCMD_GETETHER, a0@(NETCTRL_CMD) RELOC(myea, a1) movl a1, a0@(NETCTRL_ADDR) | where to put it movl #6, a0@(NETCTRL_LEN) | it is 6 bytes long movl a0, sp@- BUGCALL(MVMEPROM_NETCTRL) | ask the rom addl #4, sp | if memory size is unknown, print a diagnostic and make an | assumption movl d2, d1 cmpl #0, d1 bne Lstart1 movl #unkmemend, sp@- movl #unkmem, sp@- BUGCALL(MVMEPROM_OUTSTRCRLF) addql #8,sp movl #4*1024*1024, d1 | XXX assume 4M of ram bra Lstart1 .data unkmem: .asciz "could not figure out how much memory; assuming 4M." unkmemend: .even .text #endif Lstart1: /* initialize source/destination control registers for movs */ moveq #FC_USERD,d0 | user space movc d0,sfc | as source movc d0,dfc | and destination of transfers moveq #PGSHIFT,d2 lsrl d2,d1 | convert to pages RELOC(physmem, a0) movl d1,a0@ | save as physmem /* configure kernel and proc0 VA space so we can get going */ #if defined(DDB) || NKSYMS > 0 RELOC(esym,a0) | end of static kernel text/data/syms movl a0@,d2 jne Lstart2 #endif movl #_C_LABEL(end),d2 | end of static kernel text/data Lstart2: addl #NBPG-1,d2 andl #PG_FRAME,d2 | round to a page movl d2,a4 #if 0 | XXX clear from end-of-kernel to 1M, as a workaround for an | insane pmap_bootstrap bug I cannot find (68040-specific) movl a4,a0 movl #1024*1024,d0 cmpl a0,d0 | end of kernel is beyond 1M? jlt 2f subl a0,d0 1: clrb a0@+ subql #1,d0 bne 1b 2: #endif /* do pmap_bootstrap stuff */ clrl sp@- | firstpa pea a4@ | nextpa RELOC(pmap_bootstrap,a0) jbsr a0@ | pmap_bootstrap(firstpa, nextpa) addql #8,sp /* * While still running physical, override copypage() with the 68040 * optimized version, copypage040(), if possible. * This relies upon the fact that copypage() immediately follows * copypage040() in memory. */ RELOC(mmutype, a0) cmpl #MMU_68040,a0@ jgt Lmmu_enable RELOC(copypage040, a0) RELOC(copypage, a1) movl a1, a2 1: movw a0@+, a2@+ cmpl a0, a1 jgt 1b /* * Enable the MMU. * Since the kernel is mapped logical == physical, we just turn it on. */ Lmmu_enable: RELOC(Sysseg, a0) | system segment table addr movl a0@,d1 | read value (a KVA) RELOC(mmutype, a0) cmpl #MMU_68040,a0@ | 68040 or 68060? jgt Lmotommu1 | no, skip .long 0x4e7b1807 | movc d1,srp .long 0x4e7b1806 | movc d1,urp jra Lstploaddone Lmotommu1: RELOC(protorp, a0) movl #0x80000202,a0@ | nolimit + share global + 4 byte PTEs movl d1,a0@(4) | + segtable address pmove a0@,srp | load the supervisor root pointer movl #0x80000002,a0@ | reinit upper half for CRP loads Lstploaddone: RELOC(mmutype, a0) cmpl #MMU_68040,a0@ | 68040 or 68060? jgt Lmotommu2 | no, skip moveq #0,d0 | ensure TT regs are disabled .long 0x4e7b0004 | movc d0,itt0 .long 0x4e7b0005 | movc d0,itt1 .long 0x4e7b0006 | movc d0,dtt0 .long 0x4e7b0007 | movc d0,dtt1 .word 0xf4d8 | cinva bc .word 0xf518 | pflusha movl #0x8000,d0 .long 0x4e7b0003 | movc d0,tc /* Enable 68060 extensions here */ RELOC(mmutype, a0) cmpl #MMU_68060,a0@ | 68060? jne Lchache040 movl #CACHE60_ON,d0 | branch cache, etc... movc d0,cacr | turn on both caches jmp Lenab1 Lchache040: movl #CACHE40_ON,d0 movc d0,cacr | turn on both caches jmp Lenab1 Lmotommu2: movl #0x82c0aa00,a2@ | value to load TC with pmove a2@,tc | load it Lenab1: /* * Should be running mapped from this point on */ /* select the software page size now */ lea _ASM_LABEL(tmpstk),sp | temporary stack jbsr _C_LABEL(uvm_setpagesize) | select software page size /* set kernel stack, user SP, and initial pcb */ movl _C_LABEL(proc0paddr),a1 | get proc0 pcb addr lea a1@(USPACE-4),sp | set kernel stack to end of area lea _C_LABEL(proc0), a2 | initialize proc0.p_addr so that movl a1,a2@(P_ADDR) | we don't deref NULL in trap() movl #USRSTACK-4,a2 movl a2,usp | init user SP movl a1,_C_LABEL(curpcb) | proc0 is running tstl _C_LABEL(fputype) | Have an FPU? jeq Lenab2 | No, skip. clrl a1@(PCB_FPCTX) | ensure null FP context movl a1,sp@- jbsr _C_LABEL(m68881_restore) | restore it (does not kill a1) addql #4,sp Lenab2: /* flush TLB and turn on caches */ jbsr _ASM_LABEL(TBIA) | invalidate TLB cmpl #MMU_68040,_C_LABEL(mmutype) | 68040 or 68060? jle Lnocache0 | yes, cache already on movl #CACHE_ON,d0 movc d0,cacr | clear cache(s) Lnocache0: /* final setup for C code */ #if 1 movl #_vectab,d2 | set VBR movc d2,vbr #endif movw #PSL_LOWIPL,sr | lower SPL movl d3, _C_LABEL(bootpart) | save bootpart movl d4, _C_LABEL(bootdevlun) | save bootdevlun movl d5, _C_LABEL(bootctrllun) | save bootctrllun movl d6, _C_LABEL(bootaddr) | save bootaddr movl d7, _C_LABEL(boothowto) | save boothowto /* d3-d7 now free */ /* Final setup for call to main(). */ jbsr _C_LABEL(mvme68k_init) /* * Create a fake exception frame so that cpu_fork() can copy it. * main() never returns; we exit to user mode from a forked process * later on. */ clrw sp@- | vector offset/frame type clrl sp@- | PC - filled in by "execve" movw #PSL_USER,sp@- | in user mode clrl sp@- | stack adjust count and padding lea sp@(-64),sp | construct space for D0-D7/A0-A7 lea _C_LABEL(proc0),a0 | save pointer to frame movl sp,a0@(P_MD_REGS) | in proc0.p_md.md_regs jra _C_LABEL(main) | main() PANIC("main() returned") /* NOTREACHED */ #if defined(MVME162) || defined(MVME167) || defined(MVME177) || defined(MVME172) /* * Figure out the size of onboard DRAM by querying the memory controller(s). * This has to be done in locore as badaddr() can not yet be used at this * point. */ GLOBAL(memsize1x7) movl #0xfff43008,a0 | MEMC040/MEMECC Controller #1 jbsr memc040read movl d0,d2 movl #0xfff43108,a0 | MEMC040/MEMECC Controller #2 jbsr memc040read addl d0,d2 rts /* * Probe for a memory controller ASIC (MEMC040 or MEMECC) at the * address in a0. If found, return the size in bytes of any RAM * controller by the ASIC in d0. Otherwise return zero. */ ASLOCAL(memc040read) moveml d1-d2/a1-a2,sp@- | save scratch regs movc vbr,d2 | Save vbr RELOC(vectab,a2) | Install our own vectab, temporarily movc a2,vbr ASRELOC(Lmemc040berr,a1) | get address of bus error handler movl a2@(8),sp@- | Save current bus error handler addr movl a1,a2@(8) | Install our own handler movl sp,d0 | Save current stack pointer value movql #0x07,d1 andb a0@,d1 | Access MEMC040/MEMECC movl #0x400000,d0 lsll d1,d0 | Convert to memory size, in bytes Lmemc040ret: movc d2,vbr | Restore original vbr movl sp@+,a2@(8) | Restore original bus error handler moveml sp@+,d1-d2/a1-a2 rts /* * If the memory controller doesn't exist, we get a bus error trying * to access a0@ above. Control passes here, where we flag 'no bytes', * ditch the exception frame and return as normal. */ Lmemc040berr: movl d0,sp | Get rid of the exception frame clrl d0 | No ASIC at this location, then! jbra Lmemc040ret | Done #endif /* * proc_trampoline: call function in register a2 with a3 as an arg * and then rei. */ GLOBAL(proc_trampoline) movl a3,sp@- | push function arg jbsr a2@ | call function addql #4,sp | pop arg movl sp@(FR_SP),a0 | grab and load movl a0,usp | user SP moveml sp@+,#0x7FFF | restore most user regs addql #8,sp | toss SP and stack adjust jra _ASM_LABEL(rei) | and return /* * Trap/interrupt vector routines - new for 060 */ #include #if defined(M68040) || defined(M68060) ENTRY_NOPROFILE(addrerr4060) clrl sp@- | stack adjust count moveml #0xFFFF,sp@- | save user registers movl usp,a0 | save the user SP movl a0,sp@(FR_SP) | in the savearea movl sp@(FR_HW+8),sp@- clrl sp@- | dummy code movl #T_ADDRERR,sp@- | mark address error jra _ASM_LABEL(faultstkadj) | and deal with it #endif #if defined(M68060) ENTRY_NOPROFILE(buserr60) clrl sp@- | stack adjust count moveml #0xFFFF,sp@- | save user registers movl usp,a0 | save the user SP movl a0,sp@(FR_SP) | in the savearea movel sp@(FR_HW+12),d0 | FSLW btst #2,d0 | branch prediction error? jeq Lnobpe movc cacr,d2 orl #IC60_CABC,d2 | clear all branch cache entries movc d2,cacr movl d0,d1 andl #0x7ffd,d1 jeq _ASM_LABEL(faultstkadjnotrap2) Lnobpe: | we need to adjust for misaligned addresses movl sp@(FR_HW+8),d1 | grab VA btst #27,d0 | check for mis-aligned access jeq Lberr3 | no, skip addl #28,d1 | yes, get into next page | operand case: 3, | instruction case: 4+12+12 andl #PG_FRAME,d1 | and truncate Lberr3: movl d1,sp@- movl d0,sp@- | code is FSLW now. andw #0x1f80,d0 jeq Lbuserr60 | no, handle as usual movl #T_MMUFLT,sp@- | show that we are an MMU fault jra _ASM_LABEL(faultstkadj) | and deal with it Lbuserr60: tstl _C_LABEL(nofault) | device probe? jeq Lisberr | Bus Error? movl _C_LABEL(nofault),sp@- | yes, jbsr _C_LABEL(longjmp) | longjmp(nofault) #endif #if defined(M68040) ENTRY_NOPROFILE(buserr40) clrl sp@- | stack adjust count moveml #0xFFFF,sp@- | save user registers movl usp,a0 | save the user SP movl a0,sp@(FR_SP) | in the savearea movl sp@(FR_HW+20),d1 | get fault address moveq #0,d0 movw sp@(FR_HW+12),d0 | get SSW btst #11,d0 | check for mis-aligned jeq Lbe1stpg | no skip addl #3,d1 | get into next page andl #PG_FRAME,d1 | and truncate Lbe1stpg: movl d1,sp@- | pass fault address. movl d0,sp@- | pass SSW as code btst #10,d0 | test ATC jeq Lbuserr40 | no, handle as usual movl #T_MMUFLT,sp@- | show that we are an MMU fault jra _ASM_LABEL(faultstkadj) | and deal with it Lbuserr40: tstl _C_LABEL(nofault) | device probe? jeq Lisberr | it is a bus error movl _C_LABEL(nofault),sp@- | yes, jbsr _C_LABEL(longjmp) | longjmp(nofault) /* NOTREACHED */ #endif ENTRY_NOPROFILE(busaddrerr2030) clrl sp@- | stack adjust count moveml #0xFFFF,sp@- | save user registers movl usp,a0 | save the user SP movl a0,sp@(FR_SP) | in the savearea lea sp@(FR_HW),a1 | grab base of HW berr frame moveq #0,d0 movw a1@(10),d0 | grab SSW for fault processing btst #12,d0 | RB set? jeq LbeX0 | no, test RC bset #14,d0 | yes, must set FB movw d0,a1@(10) | for hardware too LbeX0: btst #13,d0 | RC set? jeq LbeX1 | no, skip bset #15,d0 | yes, must set FC movw d0,a1@(10) | for hardware too LbeX1: btst #8,d0 | data fault? jeq Lbe0 | no, check for hard cases movl a1@(16),d1 | fault address is as given in frame jra Lbe10 | thats it Lbe0: btst #4,a1@(6) | long (type B) stack frame? jne Lbe4 | yes, go handle movl a1@(2),d1 | no, can use save PC btst #14,d0 | FB set? jeq Lbe3 | no, try FC addql #4,d1 | yes, adjust address jra Lbe10 | done Lbe3: btst #15,d0 | FC set? jeq Lbe10 | no, done addql #2,d1 | yes, adjust address jra Lbe10 | done Lbe4: movl a1@(36),d1 | long format, use stage B address btst #15,d0 | FC set? jeq Lbe10 | no, all done subql #2,d1 | yes, adjust address Lbe10: movl d1,sp@- | push fault VA movl d0,sp@- | and padded SSW movw a1@(6),d0 | get frame format/vector offset andw #0x0FFF,d0 | clear out frame format cmpw #12,d0 | address error vector? jeq Lisaerr | yes, go to it movl d1,a0 | fault address movl sp@,d0 | function code from ssw btst #8,d0 | data fault? jne Lbe10a movql #1,d0 | user program access FC | (we dont separate data/program) btst #5,a1@ | supervisor mode? jeq Lbe10a | if no, done movql #5,d0 | else supervisor program access Lbe10a: ptestr d0,a0@,#7 | do a table search pmove psr,sp@ | save result movb sp@,d1 btst #2,d1 | invalid (incl. limit viol. and berr)? jeq Lmightnotbemerr | no -> wp check btst #7,d1 | is it MMU table berr? jeq Lismerr | no, must be fast jra Lisberr1 | real bus err needs not be fast. Lmightnotbemerr: btst #3,d1 | write protect bit set? jeq Lisberr1 | no: must be bus error movl sp@,d0 | ssw into low word of d0 andw #0xc0,d0 | Write protect is set on page: cmpw #0x40,d0 | was it read cycle? jeq Lisberr1 | yes, was not WPE, must be bus err Lismerr: movl #T_MMUFLT,sp@- | show that we are an MMU fault jra _ASM_LABEL(faultstkadj) | and deal with it Lisaerr: movl #T_ADDRERR,sp@- | mark address error jra _ASM_LABEL(faultstkadj) | and deal with it Lisberr1: clrw sp@ | re-clear pad word Lisberr: movl #T_BUSERR,sp@- | mark bus error jra _ASM_LABEL(faultstkadj) | and deal with it /* * FP exceptions. */ ENTRY_NOPROFILE(fpfline) #if defined(M68040) || defined(M68060) cmpl #FPU_68040,_C_LABEL(fputype) | 68040 or 68060 FPU? jlt Lfp_unimp | no, skip FPSP cmpw #0x202c,sp@(6) | format type 2? jne _C_LABEL(illinst) | no, not an FP emulation Ldofp_unimp: #ifdef FPSP jmp _ASM_LABEL(fpsp_unimp) | yes, go handle it #endif Lfp_unimp: #endif/* M68040 || M68060 */ #ifdef FPU_EMULATE clrl sp@- | stack adjust count moveml #0xFFFF,sp@- | save registers moveq #T_FPEMULI,d0 | denote as FP emulation trap jra _ASM_LABEL(fault) | do it #else jra _C_LABEL(illinst) #endif ENTRY_NOPROFILE(fpunsupp) #if defined(M68040) || defined(M68060) cmpl #FPU_68040,_C_LABEL(fputype) | 68040 or 68060 FPU? jlt _C_LABEL(illinst) | no, treat as illinst #ifdef FPSP jmp _ASM_LABEL(fpsp_unsupp) | yes, go handle it #endif Lfp_unsupp: #endif /* M68040 */ #ifdef FPU_EMULATE clrl sp@- | stack adjust count moveml #0xFFFF,sp@- | save registers moveq #T_FPEMULD,d0 | denote as FP emulation trap jra _ASM_LABEL(fault) | do it #else jra _C_LABEL(illinst) #endif /* * Handles all other FP coprocessor exceptions. * Note that since some FP exceptions generate mid-instruction frames * and may cause signal delivery, we need to test for stack adjustment * after the trap call. */ ENTRY_NOPROFILE(fpfault) clrl sp@- | stack adjust count moveml #0xFFFF,sp@- | save user registers movl usp,a0 | and save movl a0,sp@(FR_SP) | the user stack pointer clrl sp@- | no VA arg movl _C_LABEL(curpcb),a0 | current pcb lea a0@(PCB_FPCTX),a0 | address of FP savearea fsave a0@ | save state #if defined(M68040) || defined(M68060) /* always null state frame on 68040, 68060 */ cmpl #CPU_68040,_C_LABEL(cputype) jge Lfptnull #endif tstb a0@ | null state frame? jeq Lfptnull | yes, safe clrw d0 | no, need to tweak BIU movb a0@(1),d0 | get frame size bset #3,a0@(0,d0:w) | set exc_pend bit of BIU Lfptnull: fmovem fpsr,sp@- | push fpsr as code argument frestore a0@ | restore state movl #T_FPERR,sp@- | push type arg jra _ASM_LABEL(faultstkadj) | call trap and deal with stack cleanup /* * Other exceptions only cause four and six word stack frame and require * no post-trap stack adjustment. */ ENTRY_NOPROFILE(hardtrap) moveml #0xC0C0,sp@- | save scratch regs lea sp@(16),a1 | get pointer to frame movl a1,sp@- movw sp@(26),d0 movl d0,sp@- | push exception vector info movl sp@(26),sp@- | and PC jbsr _C_LABEL(hardintr) | doit lea sp@(12),sp | pop args moveml sp@+,#0x0303 | restore regs jra _ASM_LABEL(rei) | all done ENTRY_NOPROFILE(badtrap) moveml #0xC0C0,sp@- | save scratch regs movw sp@(22),sp@- | push exception vector info clrw sp@- movl sp@(22),sp@- | and PC jbsr _C_LABEL(straytrap) | report addql #8,sp | pop args moveml sp@+,#0x0303 | restore regs jra _ASM_LABEL(rei) | all done ENTRY_NOPROFILE(trap0) clrl sp@- | stack adjust count moveml #0xFFFF,sp@- | save user registers movl usp,a0 | save the user SP movl a0,sp@(FR_SP) | in the savearea movl d0,sp@- | push syscall number jbsr _C_LABEL(syscall) | handle it addql #4,sp | pop syscall arg tstl _C_LABEL(astpending) jne Lrei2 tstb _C_LABEL(ssir) jeq Ltrap1 movw #SPL1,sr tstb _C_LABEL(ssir) jne Lsir1 Ltrap1: movl sp@(FR_SP),a0 | grab and restore movl a0,usp | user SP moveml sp@+,#0x7FFF | restore most registers addql #8,sp | pop SP and stack adjust rte /* * Trap 1 - sigreturn */ ENTRY_NOPROFILE(trap1) jra _ASM_LABEL(sigreturn) /* * Trap 2 - trace trap */ ENTRY_NOPROFILE(trap2) jra _C_LABEL(trace) /* * Trap 12 is the entry point for the cachectl "syscall" (both HPUX & BSD) * cachectl(command, addr, length) * command in d0, addr in a1, length in d1 */ ENTRY_NOPROFILE(trap12) movl d1,sp@- | push length movl a1,sp@- | push addr movl d0,sp@- | push command movl _C_LABEL(curproc),sp@- | push proc pointer jbsr _C_LABEL(cachectl) | do it lea sp@(16),sp | pop args jra _ASM_LABEL(rei) | all done /* * Trace (single-step) trap (trap 1 or 2) instruction. Kernel-mode is * special. User mode traps are simply passed on to trap(). */ ENTRY_NOPROFILE(trace) clrl sp@- moveml #0xFFFF,sp@- moveq #T_TRACE,d0 | Check PSW and see what happened. | T=0 S=0 (should not happen) | T=1 S=0 trace trap from user mode | T=0 S=1 trace trap on a trap instruction | T=0 S=0 trace trap from system mode (kernel breakpoint) movw sp@(FR_HW),d1 | get SSW notw d1 | XXX no support for T0 on 680[234]0 andw #PSL_S,d1 | from system mode (T=1, S=1)? jeq Lkbrkpt | yes, kernel breakpoint jra _ASM_LABEL(fault) | no, user-mode fault /* * Trap 15 is used for: * - GDB breakpoints (in user programs) * - KGDB breakpoints (in the kernel) * - trace traps for SUN binaries (not fully supported yet) * - calling the prom, but only from the kernel * We just pass it on and let trap() sort it all out */ ENTRY_NOPROFILE(trap15) clrl sp@- | stack adjust count moveml #0xFFFF,sp@- tstl _C_LABEL(promcall) jeq L_notpromcall moveml sp@+,#0xFFFF addql #4, sp | unwind stack to put to known value | this routine is from the 147 BUG manual | currently save and restore are excessive. subql #4,sp link a6,#0 moveml #0xFFFE,sp@- movl _C_LABEL(promvbr),a0 movw a6@(14),d0 andl #0xfff,d0 movl a0@(d0:w),a6@(4) moveml sp@+,#0x7FFF unlk a6 rts | really jumps to the bug trap handler L_notpromcall: moveq #T_TRAP15,d0 movw sp@(FR_HW),d1 | get PSW andw #PSL_S,d1 | from system mode? jne Lkbrkpt | yes, kernel breakpoint jra _ASM_LABEL(fault) | no, user-mode fault Lkbrkpt: | Kernel-mode breakpoint or trace trap. (d0=trap_type) | Save the system sp rather than the user sp. movw #PSL_HIGHIPL,sr | lock out interrupts lea sp@(FR_SIZE),a6 | Save stack pointer movl a6,sp@(FR_SP) | from before trap | If we are not on tmpstk switch to it. | (so debugger can change the stack pointer) movl a6,d1 cmpl #_ASM_LABEL(tmpstk),d1 jls Lbrkpt2 | already on tmpstk | Copy frame to the temporary stack movl sp,a0 | a0=src lea _ASM_LABEL(tmpstk)-96,a1 | a1=dst movl a1,sp | sp=new frame moveq #FR_SIZE,d1 Lbrkpt1: movl a0@+,a1@+ subql #4,d1 bgt Lbrkpt1 Lbrkpt2: | Call the trap handler for the kernel debugger. | Do not call trap() to do it, so that we can | set breakpoints in trap() if we want. We know | the trap type is either T_TRACE or T_BREAKPOINT. | If we have both DDB and KGDB, let KGDB see it first, | because KGDB will just return 0 if not connected. | Save args in d2, a2 movl d0,d2 | trap type movl sp,a2 | frame ptr #ifdef KGDB | Let KGDB handle it (if connected) movl a2,sp@- | push frame ptr movl d2,sp@- | push trap type jbsr _C_LABEL(kgdb_trap) | handle the trap addql #8,sp | pop args cmpl #0,d0 | did kgdb handle it? jne Lbrkpt3 | yes, done #endif #ifdef DDB | Let DDB handle it movl a2,sp@- | push frame ptr movl d2,sp@- | push trap type jbsr _C_LABEL(kdb_trap) | handle the trap addql #8,sp | pop args cmpl #0,d0 | did ddb handle it? jne Lbrkpt3 | yes, done #endif | Drop into the prom BUGCALL(MVMEPROM_EXIT) Lbrkpt3: | The stack pointer may have been modified, or | data below it modified (by kgdb push call), | so push the hardware frame at the current sp | before restoring registers and returning. movl sp@(FR_SP),a0 | modified sp lea sp@(FR_SIZE),a1 | end of our frame movl a1@-,a0@- | copy 2 longs with movl a1@-,a0@- | ... predecrement movl a0,sp@(FR_SP) | sp = h/w frame moveml sp@+,#0x7FFF | restore all but sp movl sp@,sp | ... and sp rte | all done /* Use common m68k sigreturn */ #include /* * Interrupt handlers. * No device interrupts are auto-vectored. */ ENTRY_NOPROFILE(spurintr) addql #1,_C_LABEL(uvmexp)+UVMEXP_INTRS jra _ASM_LABEL(rei) | all done /* * Emulation of VAX REI instruction. * * This code deals with checking for and servicing ASTs * (profiling, scheduling) and software interrupts (network, softclock). * We check for ASTs first, just like the VAX. To avoid excess overhead * the T_ASTFLT handling code will also check for software interrupts so we * do not have to do it here. After identifing that we need an AST we * drop the IPL to allow device interrupts. * * This code is complicated by the fact that sendsig may have been called * necessitating a stack cleanup. */ BSS(ssir,1) ASENTRY_NOPROFILE(rei) tstl _C_LABEL(astpending) | AST pending? jeq Lchksir | no, go check for SIR Lrei1: btst #5,sp@ | yes, are we returning to user mode? jne Lchksir | no, go check for SIR movw #PSL_LOWIPL,sr | lower SPL clrl sp@- | stack adjust moveml #0xFFFF,sp@- | save all registers movl usp,a1 | including movl a1,sp@(FR_SP) | the users SP Lrei2: clrl sp@- | VA == none clrl sp@- | code == none movl #T_ASTFLT,sp@- | type == async system trap jbsr _C_LABEL(trap) | go handle it lea sp@(12),sp | pop value args movl sp@(FR_SP),a0 | restore user SP movl a0,usp | from save area movw sp@(FR_ADJ),d0 | need to adjust stack? jne Laststkadj | yes, go to it moveml sp@+,#0x7FFF | no, restore most user regs addql #8,sp | toss SP and stack adjust rte | and do real RTE Laststkadj: lea sp@(FR_HW),a1 | pointer to HW frame addql #8,a1 | source pointer movl a1,a0 | source addw d0,a0 | + hole size = dest pointer movl a1@-,a0@- | copy movl a1@-,a0@- | 8 bytes movl a0,sp@(FR_SP) | new SSP moveml sp@+,#0x7FFF | restore user registers movl sp@,sp | and our SP rte | and do real RTE Lchksir: tstb _C_LABEL(ssir) | SIR pending? jeq Ldorte | no, all done movl d0,sp@- | need a scratch register movw sp@(4),d0 | get SR andw #PSL_IPL7,d0 | mask all but IPL jne Lnosir | came from interrupt, no can do movl sp@+,d0 | restore scratch register Lgotsir: movw #SPL1,sr | prevent others from servicing int tstb _C_LABEL(ssir) | too late? jeq Ldorte | yes, oh well... clrl sp@- | stack adjust moveml #0xFFFF,sp@- | save all registers movl usp,a1 | including movl a1,sp@(FR_SP) | the users SP Lsir1: clrl sp@- | VA == none clrl sp@- | code == none movl #T_SSIR,sp@- | type == software interrupt jbsr _C_LABEL(trap) | go handle it lea sp@(12),sp | pop value args movl sp@(FR_SP),a0 | restore movl a0,usp | user SP moveml sp@+,#0x7FFF | and all remaining registers addql #8,sp | pop SP and stack adjust rte Lnosir: movl sp@+,d0 | restore scratch register Ldorte: rte | real return /* * Use common m68k signal trampoline. */ #include /* * Use common m68k support routines. */ #include /* * Use common m68k process manipulation routines. */ #include .data GLOBAL(curpcb) .long 0 ASBSS(nullpcb,SIZEOF_PCB) /* * At exit of a process, do a switch for the last time. * Switch to a safe stack and PCB, and deallocate the process's resources. */ ENTRY(switch_exit) movl sp@(4),a0 | save state into garbage pcb movl #_ASM_LABEL(nullpcb),_C_LABEL(curpcb) lea _ASM_LABEL(tmpstk),sp | goto a tmp stack /* Schedule the vmspace and stack to be freed. */ movl a0,sp@- | exit2(p) jbsr _C_LABEL(exit2) lea sp@(4),sp | pop args jra _C_LABEL(cpu_switch) /* * When no processes are on the runq, Swtch branches to Idle * to wait for something to come ready. */ ASENTRY_NOPROFILE(Idle) stop #PSL_LOWIPL movw #PSL_HIGHIPL,sr movl _C_LABEL(whichqs),d0 jeq _ASM_LABEL(Idle) jra Lsw1 Lbadsw: PANIC("switch") /*NOTREACHED*/ /* * cpu_switch() * * NOTE: On the mc68851 we attempt to avoid flushing the * entire ATC. The effort involved in selective flushing may not be * worth it, maybe we should just flush the whole thing? * * NOTE 2: With the new VM layout we now no longer know if an inactive * user's PTEs have been changed (formerly denoted by the SPTECHG p_flag * bit). For now, we just always flush the full ATC. */ ENTRY(cpu_switch) movl _C_LABEL(curpcb),a0 | current pcb movw sr,a0@(PCB_PS) | save sr before changing ipl #ifdef notyet movl _C_LABEL(curproc),sp@- | remember last proc running #endif clrl _C_LABEL(curproc) /* * Find the highest-priority queue that isn't empty, * then take the first proc from that queue. */ movw #PSL_HIGHIPL,sr | lock out interrupts movl _C_LABEL(whichqs),d0 jeq _ASM_LABEL(Idle) Lsw1: movl d0,d1 negl d0 andl d1,d0 bfffo d0{#0:#32},d1 eorib #31,d1 movl d1,d0 lslb #3,d1 | convert queue number to index addl #_C_LABEL(qs),d1 | locate queue (q) movl d1,a1 movl a1@(P_FORW),a0 | p = q->p_forw cmpal d1,a0 | anyone on queue? jeq Lbadsw | no, panic movl a0@(P_FORW),a1@(P_FORW) | q->p_forw = p->p_forw movl a0@(P_FORW),a1 | n = p->p_forw movl d1,a1@(P_BACK) | n->p_back = q cmpal d1,a1 | anyone left on queue? jne Lsw2 | yes, skip movl _C_LABEL(whichqs),d1 bclr d0,d1 | no, clear bit movl d1,_C_LABEL(whichqs) Lsw2: movl a0,_C_LABEL(curproc) clrl _C_LABEL(want_resched) #ifdef notyet movl sp@+,a1 cmpl a0,a1 | switching to same proc? jeq Lswdone | yes, skip save and restore #endif /* * Save state of previous process in its pcb. */ movl _C_LABEL(curpcb),a1 moveml #0xFCFC,a1@(PCB_REGS) | save non-scratch registers movl usp,a2 | grab USP (a2 has been saved) movl a2,a1@(PCB_USP) | and save it #ifdef FPU_EMULATE tstl _C_LABEL(fputype) | do we have any FPU? jeq Lswnofpsave | no, dont save #endif lea a1@(PCB_FPCTX),a2 | pointer to FP save area fsave a2@ | save FP state #ifdef M68060 cmpl #FPU_68060,_C_LABEL(fputype) | is 68060? jeq Lsavfp60 | yes, goto Lsavfp60 #endif /* M68060 */ tstb a2@ | null state frame? jeq Lswnofpsave | yes, all done fmovem fp0-fp7,a2@(FPF_REGS) | save FP general registers fmovem fpcr/fpsr/fpi,a2@(FPF_FPCR) | save FP control registers #ifdef M68060 jra Lswnofpsave Lsavfp60: tstb a2@(2) | null state frame? jeq Lswnofpsave | yes, all done fmovem fp0-fp7,a2@(FPF_REGS) | save FP general registers fmovem fpcr,a2@(FPF_FPCR) | save FP control registers fmovem fpsr,a2@(FPF_FPSR) fmovem fpi,a2@(FPF_FPI) #endif /* M68060 */ Lswnofpsave: #ifdef DIAGNOSTIC tstl a0@(P_WCHAN) jne Lbadsw cmpb #SRUN,a0@(P_STAT) jne Lbadsw #endif movb #SONPROC,a0@(P_STAT) clrl a0@(P_BACK) | clear back link movl a0@(P_ADDR),a1 | get p_addr movl a1,_C_LABEL(curpcb) /* * Activate process's address space. * XXX Should remember the last USTP value loaded, and call this * XXX only of it has changed. */ pea a0@ | push proc jbsr _C_LABEL(pmap_activate) | pmap_activate(p) addql #4,sp movl _C_LABEL(curpcb),a1 | restore p_addr lea _ASM_LABEL(tmpstk),sp | now goto a tmp stack for NMI moveml a1@(PCB_REGS),#0xFCFC | and registers movl a1@(PCB_USP),a0 movl a0,usp | and USP #ifdef FPU_EMULATE tstl _C_LABEL(fputype) | do we _have_ any fpu? jne Lresnonofpatall movw a1@(PCB_PS),sr | no, restore PS moveq #1,d0 | return 1 (for alternate returns) rts Lresnonofpatall: #endif lea a1@(PCB_FPCTX),a0 | pointer to FP save area #ifdef M68060 cmpl #FPU_68060,_C_LABEL(fputype) | is 68060? jeq Lresfp60rest1 | yes, goto Lresfp60rest1 #endif /* M68060 */ tstb a0@ | null state frame? jeq Lresfprest2 | yes, easy fmovem a0@(FPF_FPCR),fpcr/fpsr/fpi | restore FP control registers fmovem a0@(FPF_REGS),fp0-fp7 | restore FP general registers Lresfprest2: frestore a0@ | restore state movw a1@(PCB_PS),sr | no, restore PS moveq #1,d0 | return 1 (for alternate returns) rts #ifdef M68060 Lresfp60rest1: tstb a0@(2) | null state frame? jeq Lresfp60rest2 | yes, easy fmovem a0@(FPF_FPCR),fpcr | restore FP control registers fmovem a0@(FPF_FPSR),fpsr fmovem a0@(FPF_FPI),fpi fmovem a0@(FPF_REGS),fp0-fp7 | restore FP general registers Lresfp60rest2: frestore a0@ | restore state movw a1@(PCB_PS),sr | no, restore PS moveq #1,d0 | return 1 (for alternate returns) rts #endif /* M68060 */ /* * savectx(pcb) * Update pcb, saving current processor state. */ ENTRY(savectx) movl sp@(4),a1 movw sr,a1@(PCB_PS) movl usp,a0 | grab USP movl a0,a1@(PCB_USP) | and save it moveml #0xFCFC,a1@(PCB_REGS) | save non-scratch registers #ifdef FPU_EMULATE tstl _C_LABEL(fputype) jeq Lsavedone #endif lea a1@(PCB_FPCTX),a0 | pointer to FP save area fsave a0@ | save FP state #ifdef M68060 cmpl #FPU_68060,_C_LABEL(fputype) | is 68060? jeq Lsavctx60 | yes, goto Lsavctx60 #endif tstb a0@ | null state frame? jeq Lsavedone | yes, all done fmovem fp0-fp7,a0@(FPF_REGS) | save FP general registers fmovem fpcr/fpsr/fpi,a0@(FPF_FPCR) | save FP control registers moveq #0,d0 rts #ifdef M68060 Lsavctx60: tstb a0@(2) jeq Lsavedone fmovem fp0-fp7,a0@(FPF_REGS) | save FP general registers fmovem fpcr,a0@(FPF_FPCR) | save FP control registers fmovem fpsr,a0@(FPF_FPSR) fmovem fpi,a0@(FPF_FPI) #endif Lsavedone: moveq #0,d0 | return 0 rts #if defined(M68040) || defined(M68060) ENTRY(suline) movl sp@(4),a0 | address to write movl _C_LABEL(curpcb),a1 | current pcb movl #Lslerr,a1@(PCB_ONFAULT) | where to return to on a fault movl sp@(8),a1 | address of line movl a1@+,d0 | get lword movsl d0,a0@+ | put lword nop | sync movl a1@+,d0 | get lword movsl d0,a0@+ | put lword nop | sync movl a1@+,d0 | get lword movsl d0,a0@+ | put lword nop | sync movl a1@+,d0 | get lword movsl d0,a0@+ | put lword nop | sync moveq #0,d0 | indicate no fault jra Lsldone Lslerr: moveq #-1,d0 Lsldone: movl _C_LABEL(curpcb),a1 | current pcb clrl a1@(PCB_ONFAULT) | clear fault address rts #endif /* * Invalidate entire TLB. */ ASENTRY_NOPROFILE(TBIA) cmpl #MMU_68040,_C_LABEL(mmutype) | 68040 or 68060? jle Ltbia040 | yes, goto Ltbia040 pflusha | flush entire TLB tstl _C_LABEL(mmutype) jpl Lmc68851a | 68851 implies no d-cache movl #DC_CLEAR,d0 movc d0,cacr | invalidate on-chip d-cache Lmc68851a: rts Ltbia040: .word 0xf518 | pflusha #ifdef M68060 cmpl #MMU_68060,_C_LABEL(mmutype) | is 68060? jne Ltbiano60 | no, skip movc cacr,d0 orl #IC60_CABC,d0 | and clear all branch cache entries movc d0,cacr #endif Ltbiano60: rts /* * Invalidate any TLB entry for given VA (TB Invalidate Single) */ ENTRY(TBIS) movl sp@(4),a0 | get addr to flush cmpl #MMU_68040,_C_LABEL(mmutype) | 68040 or 68060 ? jle Ltbis040 | yes, goto Ltbis040 tstl _C_LABEL(mmutype) jpl Lmc68851b | is 68851? pflush #0,#0,a0@ | flush address from both sides movl #DC_CLEAR,d0 movc d0,cacr | invalidate on-chip data cache rts Lmc68851b: pflushs #0,#0,a0@ | flush address from both sides rts Ltbis040: moveq #FC_SUPERD,d0 | select supervisor movc d0,dfc .word 0xf508 | pflush a0@ moveq #FC_USERD,d0 | select user movc d0,dfc .word 0xf508 | pflush a0@ #ifdef M68060 cmpl #MMU_68060,_C_LABEL(mmutype) | is 68060? jne Ltbisno60 | no, skip movc cacr,d0 orl #IC60_CABC,d0 | and clear all branch cache entries movc d0,cacr Ltbisno60: #endif rts /* * Invalidate supervisor side of TLB */ #if defined(M68060) ENTRY(TBIAS) | 68060 cannot specify supervisor/user on pflusha, so we flush all .word 0xf518 | pflusha movc cacr,d0 orl #IC60_CABC,d0 | and clear all branch cache entries movc d0,cacr rts #endif #if defined(COMPAT_HPUX) || defined(M68060) /* * Invalidate user side of TLB */ ENTRY(TBIAU) cmpl #MMU_68040,_C_LABEL(mmutype) jle Ltbiau040 tstl _C_LABEL(mmutype) jpl Lmc68851d | 68851? pflush #0,#4 | flush user TLB entries movl #DC_CLEAR,d0 movc d0,cacr | invalidate on-chip d-cache rts Lmc68851d: pflushs #0,#4 | flush user TLB entries rts Ltbiau040: | 68040 cannot specify supervisor/user on pflusha, so we flush all .word 0xf518 | pflusha #ifdef M68060 cmpl #MMU_68060,_C_LABEL(mmutype) jne Ltbiauno60 movc cacr,d0 orl #IC60_CUBC,d0 | but only user branch cache entries movc d0,cacr Ltbiauno60: #endif rts #endif /* defined(COMPAT_HPUX) || defined(M68060) */ /* * Invalidate instruction cache */ ENTRY(ICIA) #if defined(M68040) || defined(M68060) cmpl #MMU_68040,_C_LABEL(mmutype) | 68040 or 68060? jgt 1f | no, skip .word 0xf498 | cinva ic rts 1: #endif movl #IC_CLEAR,d0 movc d0,cacr | invalidate i-cache rts /* * Invalidate data cache. * * NOTE: we do not flush 68030 on-chip cache as there are no aliasing * problems with DC_WA. The only cases we have to worry about are context * switch and TLB changes, both of which are handled "in-line" in resume * and TBI*. * Because of this, since there is no way on 68040 and 68060 to flush * user and supervisor modes specfically, DCIS and DCIU are the same entry * point as DCIA. */ ENTRY(DCIA) ENTRY(DCIS) ENTRY(DCIU) #if defined(M68040) || defined(M68060) cmpl #MMU_68040,_C_LABEL(mmutype) | 68040 or 68060? jgt 1f | no, skip .word 0xf478 | cpusha dc #endif rts #if defined(M68040) || defined(M68060) ENTRY(ICPA) .word 0xf498 | cinva ic rts ENTRY(DCFA) .word 0xf478 | cpusha dc rts ENTRY(ICPL) movl sp@(4),a0 | address .word 0xf488 | cinvl ic,a0@ rts ENTRY(ICPP) movl sp@(4),a0 | address .word 0xf490 | cinvp ic,a0@ rts ENTRY(DCPL) movl sp@(4),a0 | address .word 0xf448 | cinvl dc,a0@ rts ENTRY(DCPP) movl sp@(4),a0 | address .word 0xf450 | cinvp dc,a0@ rts ENTRY(DCFL) movl sp@(4),a0 | address .word 0xf468 | cpushl dc,a0@ rts ENTRY(DCFP) movl sp@(4),a0 | address .word 0xf470 | cpushp dc,a0@ rts #endif ENTRY(getsfc) movc sfc,d0 rts ENTRY(getdfc) movc dfc,d0 rts /* * Load a new user segment table pointer. */ ENTRY(loadustp) movl sp@(4),d0 | new USTP moveq #PGSHIFT,d1 lsll d1,d0 | convert to addr #if defined(M68040) || defined(M68060) cmpl #MMU_68040,_C_LABEL(mmutype) #ifdef M68060 jlt Lldustp060 #endif #ifdef M68040 jeq Lldustp040 #endif #endif pflusha | flush entire TLB lea _C_LABEL(protorp),a0 | CRP prototype movl d0,a0@(4) | stash USTP pmove a0@,crp | load root pointer movl #CACHE_CLR,d0 movc d0,cacr | invalidate cache(s) rts #ifdef M68060 Lldustp060: movc cacr,d1 orl #IC60_CUBC,d1 | clear user branch cache entries movc d1,cacr /* FALLTHROUGH */ #endif Lldustp040: .word 0xf518 | pflusha .long 0x4e7b0806 | movec d0,URP rts /* * Set processor priority level calls. Most are implemented with * inline asm expansions. However, spl0 requires special handling * as we need to check for our emulated software interrupts. */ ENTRY(spl0) moveq #0,d0 movw sr,d0 | get old SR for return movw #PSL_LOWIPL,sr | restore new SR tstb _C_LABEL(ssir) | software interrupt pending? jeq Lspldone | no, all done subql #4,sp | make room for RTE frame movl sp@(4),sp@(2) | position return address clrw sp@(6) | set frame type 0 movw #PSL_LOWIPL,sp@ | and new SR jra Lgotsir | go handle it Lspldone: rts /* * Save and restore 68881 state. * Pretty awful looking since our assembler does not * recognize FP mnemonics. */ ENTRY(m68881_save) movl sp@(4),a0 | save area pointer fsave a0@ | save state #ifdef M68060 cmpl #FPU_68060,_C_LABEL(fputype) | is 68060? jeq Lm68060fpsave | yes, goto Lm68060fpsave #endif tstb a0@ | null state frame? jeq Lm68881sdone | yes, all done fmovem fp0-fp7,a0@(FPF_REGS) | save FP general registers fmovem fpcr/fpsr/fpi,a0@(FPF_FPCR) | save FP control registers Lm68881sdone: rts #ifdef M68060 Lm68060fpsave: tstb a0@(2) | null state frame? jeq Lm68060sdone | yes, all done fmovem fp0-fp7,a0@(FPF_REGS) | save FP general registers fmovem fpcr,a0@(FPF_FPCR) | save FP control registers fmovem fpsr,a0@(FPF_FPSR) fmovem fpi,a0@(FPF_FPI) Lm68060sdone: rts #endif ENTRY(m68881_restore) movl sp@(4),a0 | save area pointer #ifdef M68060 cmpl #FPU_68060,_C_LABEL(fputype) | is 68060? jeq Lm68060fprestore | yes, goto Lm68060fprestore #endif tstb a0@ | null state frame? jeq Lm68881rdone | yes, easy fmovem a0@(FPF_FPCR),fpcr/fpsr/fpi | restore FP control registers fmovem a0@(FPF_REGS),fp0-fp7 | restore FP general registers Lm68881rdone: frestore a0@ | restore state rts #ifdef M68060 Lm68060fprestore: tstb a0@(2) | null state frame? jeq Lm68060fprdone | yes, easy fmovem a0@(FPF_FPCR),fpcr | restore FP control registers fmovem a0@(FPF_FPSR),fpsr fmovem a0@(FPF_FPI),fpi fmovem a0@(FPF_REGS),fp0-fp7 | restore FP general registers Lm68060fprdone: frestore a0@ | restore state rts #endif /* * Handle the nitty-gritty of rebooting the machine. * Basically we just turn off the MMU and jump to the appropriate ROM routine. * XXX add support for rebooting -- that means looking at boothowto and doing * the right thing */ ENTRY_NOPROFILE(doboot) lea _ASM_LABEL(tmpstk),sp | physical SP in case of NMI #if defined(M68040) || defined(M68060) cmpl #MMU_68040,_C_LABEL(mmutype) | 68040? jgt Lbootnot040 | no, skip movl #0,d0 movc d0,cacr | caches off .long 0x4e7b0003 | movc d0,tc (turn off MMU) bra 1f Lbootnot040: #endif movl #CACHE_OFF,d0 movc d0,cacr | disable on-chip cache(s) movl #0,a7@ | value for pmove to TC (turn off MMU) pmove a7@,tc | disable MMU 1: movl #0,d0 movc d0,vbr | ROM VBR /* * We're going down. Make various sick attempts to reset the board. */ RELOC(cputyp, a0) movl a0@,d0 cmpw #CPU_147,d0 bne not147 movl #0xfffe2000,a0 | MVME147: "struct vme1reg *" movw a0@,d0 movl d0,d1 andw #0x0001,d1 | is VME1_SCON_SWITCH set? beq 1f | not SCON. may not use SRESET. orw #0x0002,d0 | ok, assert VME1_SCON_SRESET movw d0,a0@ 1: movl #0xff800000,a0 | if we get here, SRESET did not work. movl a0@(4),a0 | try jumping directly to the ROM. jsr a0@ | still alive! just return to the prom.. bra 3f not147: movl #0xfff40000,a0 | MVME16x: "struct vme2reg *" movl a0@(0x60),d0 movl d0,d1 andl #0x40000000,d1 | is VME2_TCTL_SCON set? beq 1f | not SCON. may not use SRESET. orl #0x00800000,d0 | ok, assert VME2_TCTL_SRST movl d0,a0@(0x60) 1: | lets try the local bus reset movl #0xfff40000,a0 | MVME16x: "struct vme2reg *" movl a0@(0x104),d0 orw #0x00000080,d0 movl d0,a0@(0x104) | lets try jumping off to rom. movl #0xff800000,a0 | if we get here, SRESET did not work. movl a0@(4),a0 | try jumping directly to the ROM. jsr a0@ | still alive! just return to the prom.. 3: BUGCALL(MVMEPROM_EXIT) | return to m68kbug /*NOTREACHED*/ #if defined(M68060) && defined(M060SP) GLOBAL(intemu60) jra _I_CALL_TOP+128+0x00 GLOBAL(fpiemu60) jra _FP_CALL_TOP+128+0x30 GLOBAL(fpdemu60) jra _FP_CALL_TOP+128+0x38 GLOBAL(fpeaemu60) jra _FP_CALL_TOP+128+0x40 #endif .data GLOBAL(mmutype) .long MMU_68030 | default to MMU_68030 GLOBAL(cputype) .long CPU_68030 | default to CPU_68030 GLOBAL(fputype) .long FPU_68881 | default to 68881 FPU GLOBAL(protorp) .long 0,0 | prototype root pointer GLOBAL(cold) .long 1 | cold start flag GLOBAL(want_resched) .long 0 GLOBAL(proc0paddr) .long 0 | KVA of proc0 u-area GLOBAL(intiobase) .long 0 | KVA of base of internal IO space GLOBAL(intiolimit) .long 0 | KVA of end of internal IO space GLOBAL(extiobase) .long 0 | KVA of base of external IO space #include