/* $NetBSD: locore.s,v 1.46 2024/01/17 12:33:49 thorpej Exp $ */ /* * 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 */ /* * Copyright (c) 1994, 1995 Gordon W. Ross * Copyright (c) 1988 University of Utah. * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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 "opt_compat_netbsd.h" #include "opt_compat_sunos.h" #include "opt_ddb.h" #include "opt_fpsp.h" #include "opt_fpu_emulate.h" #include "opt_m68k_arch.h" #include "ksyms.h" #include "assym.h" #include #include /* * This is for kvm_mkdb, and should be the address of the beginning * of the kernel text segment (not necessarily the same as kernbase). */ .text GLOBAL(kernel_text) /* * 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 PAGE_SIZE ASLOCAL(tmpstk) .text /* * Macro to relocate a symbol, used before MMU is enabled. */ #define _RELOC(var, ar) \ lea var-KERNBASE,ar; \ addl %a5,ar #define RELOC(var, ar) _RELOC(_C_LABEL(var), ar) #define ASRELOC(var, ar) _RELOC(_ASM_LABEL(var), ar) /* * Initialization * * A4 contains the address of the end of the symtab * A5 contains physical load point from boot * VBR contains zero from ROM. Exceptions will continue to vector * through ROM until MMU is turned on at which time they will vector * through our table (vectors.s). */ BSS(lowram,4) BSS(esym,4) .text ASENTRY_NOPROFILE(start) movw #PSL_HIGHIPL, %sr | no interrupts movl #CACHE_OFF, %d0 movc %d0, %cacr | clear and disable on-chip cache(s) /* XXX fixed load address */ movl #0x20100000, %a5 movl #0x20000000, %a0 RELOC(edata, %a1) 1: movl %a5@+, %a0@+ cmpl %a5, %a1 bne 1b movl #0x20000000, %a5 ASRELOC(tmpstk, %a0) movl %a0, %sp | give ourselves a temporary stack RELOC(edata, %a0) RELOC(end, %a1) 2: clrb %a0@+ cmpl %a0, %a1 bne 2b RELOC(esym, %a0) #if 0 movl %a4, %a0@ | store end of symbol table #else clrl %a0@ | no symbol table, yet #endif RELOC(lowram, %a0) movl %a5, %a0@ | store start of physical memory #if 0 RELOC(boothowto, %a0) | save reboot flags movl %d7, %a0@ RELOC(bootdev, %a0) | and boot device movl %d6, %a0@ #endif /* * All data registers are now free. All address registers * except a5 are free. a5 is used by the RELOC() macro, * and cannot be used until after the MMU is enabled. */ /* determine our CPU/MMU combo - check for all regardless of kernel config */ movl #0x200,%d0 | data freeze bit movc %d0,%cacr | only exists on 68030 movc %cacr,%d0 | read it back tstl %d0 | zero? jeq Lnot68030 | yes, we have 68020/68040 RELOC(mmutype, %a0) | no, we have 68030 movl #MMU_68030,%a0@ | set to reflect 68030 PMMU RELOC(cputype, %a0) movl #CPU_68030,%a0@ | and 68030 CPU jra Lstart1 Lnot68030: bset #31,%d0 | data cache enable bit movc %d0,%cacr | only exists on 68040 movc %cacr,%d0 | read it back tstl %d0 | zero? beq Lis68020 | yes, we have 68020 moveq #0,%d0 | now turn it back off movec %d0,%cacr | before we access any data RELOC(mmutype, %a0) movl #MMU_68040,%a0@ | with a 68040 MMU RELOC(cputype, %a0) movl #CPU_68040,%a0@ | and a 68040 CPU RELOC(fputype, %a0) movl #FPU_68040,%a0@ | ...and FPU jra Lstart1 Lis68020: /* impossible */ 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 /* initialize memory size (for pmap_bootstrap) */ movl 0x5c00ac00, %d0 andb #0x60, %d0 jne Lnot8M movl #0x20800000, %d1 | memory end, 8M jra Lmemok Lnot8M: cmpb #0x20, %d0 jne Lunkmem movl #0x22000000, %d1 | memory end, 32M jra Lmemok Lunkmem: /* ??? */ movl #0x20400000, %d1 | memory end, assume at least 4M Lmemok: moveq #PGSHIFT,%d2 lsrl %d2,%d1 | convert to page (click) number movl %a5,%d0 | lowram value from ROM via boot lsrl %d2,%d0 | convert to page number subl %d0,%d1 | compute amount of RAM present RELOC(physmem, %a0) movl %d1,%a0@ | and physmem /* configure kernel and lwp0 VA space so we can get going */ .globl _Sysseg_pa, _pmap_bootstrap, _avail_start #if NKSYMS || defined(DDB) || defined(MODULAR) RELOC(esym,%a0) | end of static kernel test/data/syms movl %a0@,%d5 jne Lstart2 #endif movl #_C_LABEL(end),%d5 | end of static kernel text/data Lstart2: addl #PAGE_SIZE-1,%d5 andl #PG_FRAME,%d5 | round to a page movl %d5,%a4 addl %a5,%a4 | convert to PA subl #KERNBASE, %a4 pea %a5@ | firstpa pea %a4@ | nextpa RELOC(pmap_bootstrap,%a0) jbsr %a0@ | pmap_bootstrap(firstpa, nextpa) addql #8,%sp /* * Prepare to enable MMU. */ RELOC(Sysseg_pa, %a0) | system segment table addr movl %a0@,%d1 | read value (a PA) subl #KERNBASE, %d1 RELOC(mmutype, %a0) cmpl #MMU_68040,%a0@ | 68040? jne Lmotommu1 | no, skip .long 0x4e7b1807 | movc d1,srp jra Lstploaddone Lmotommu1: #ifdef M68030 RELOC(protorp, %a0) movl %d1,%a0@(4) | segtable address pmove %a0@,%srp | load the supervisor root pointer #endif /* M68030 */ Lstploaddone: RELOC(mmutype, %a0) cmpl #MMU_68040,%a0@ | 68040? jne Lmotommu2 | no, skip movel #0x2000c000, %d0 | double map RAM .long 0x4e7b0004 | movc d0,itt0 .long 0x4e7b0006 | movc d0,dtt0 moveq #0, %d0 | ensure TT regs are disabled .long 0x4e7b0005 | movc d0,itt1 .long 0x4e7b0007 | movc d0,dtt1 .word 0xf4d8 | cinva bc .word 0xf518 | pflusha movl #MMU40_TCR_BITS, %d0 .long 0x4e7b0003 | movc d0,tc movl #0x80008000, %d0 movc %d0, %cacr | turn on both caches jmp Lenab1:l | avoid pc-relative Lmotommu2: /* XXX do TT here */ pflusha RELOC(prototc, %a2) movl #MMU51_TCR_BITS,%a2@ | value to load TC with pmove %a2@,%tc | load it jmp Lenab1 /* * Should be running mapped from this point on */ Lenab1: .word 0xf4d8 | cinva bc .word 0xf518 | pflusha nop nop nop nop nop 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 lea _ASM_LABEL(tmpstk),%sp | re-load temporary stack jbsr _C_LABEL(vec_init) | initialize vector table /* call final pmap setup */ jbsr _C_LABEL(pmap_bootstrap_finalize) /* set kernel stack, user SP */ movl _C_LABEL(lwp0uarea),%a1 | get lwp0 uarea lea %a1@(USPACE-4),%sp | set kernel stack to end of area movl #USRSTACK-4,%a2 movl %a2,%usp | init user SP 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 _C_LABEL(_TBIA) | invalidate TLB cmpl #MMU_68040,_C_LABEL(mmutype) | 68040? jeq Lnocache0 | yes, cache already on movl #CACHE_ON,%d0 movc %d0,%cacr | clear cache(s) Lnocache0: /* Final setup for call to main(). */ jbsr _C_LABEL(fic_init) /* * Create a fake exception frame so that cpu_lwp_fork() can copy it. * main() nevers 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(lwp0),%a0 | save pointer to frame movl %sp,%a0@(L_MD_REGS) | in lwp0.l_md.md_regs jra _C_LABEL(main) | main() pea Lmainreturned | Yow! Main returned! jbsr _C_LABEL(panic) /* NOTREACHED */ Lmainreturned: .asciz "main() returned" .even /* * Trap/interrupt vector routines */ #include /* * Use common m68k bus error and address error handlers. */ #include /* * FP exceptions. */ ENTRY_NOPROFILE(fpfline) #if defined(M68040) cmpl #FPU_68040,_C_LABEL(fputype) | 68040 FPU? jne 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 #if 0 addl #1, _C_LABEL(evcnt_fpsp_unimp)+EVCNT_COUNT #endif jmp _ASM_LABEL(fpsp_unimp) | yes, go handle it #endif Lfp_unimp: #endif /* M68040 */ #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) cmpl #FPU_68040,_C_LABEL(fputype) | 68040 FPU? jne _C_LABEL(illinst) | no, treat as illinst #ifdef FPSP #if 0 addl #1, _C_LABEL(evcnt_fpsp_unsupp)+EVCNT_COUNT #endif 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 #FPU_68040,_C_LABEL(fputype) 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 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 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 _C_LABEL(curlwp),%a0 movl %a0@(L_PROC),%sp@- | push current proc pointer movl %d1,%sp@- | push length movl %a1,%sp@- | push addr movl %d0,%sp@- | push command jbsr _C_LABEL(cachectl1) | do it lea %sp@(16),%sp | pop args jra _ASM_LABEL(rei) | all done /* * Trace (single-step) trap. Kernel-mode is special. * User mode traps are simply passed on to trap(). */ ENTRY_NOPROFILE(trace) clrl %sp@- | stack adjust count moveml #0xFFFF,%sp@- moveq #T_TRACE,%d0 | Check PSW and see what happen. | 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=1 S=1 trace trap from system mode (kernel breakpoint) movw %sp@(FR_HW),%d1 | get PSW notw %d1 | XXX no support for T0 on 680[234]0 andw #PSL_TS,%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) * User mode traps are simply passed to trap(). */ ENTRY_NOPROFILE(trap15) clrl %sp@- | stack adjust count moveml #0xFFFF,%sp@- 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 were 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. movl %d0,%sp@- | push trap type jbsr _C_LABEL(trap_kdebug) addql #4,%sp | pop args | 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 /* * Interrupt handlers. */ ENTRY_NOPROFILE(lev6intr) /* Level 6: clock */ INTERRUPT_SAVEREG /* XXX */ movl _C_LABEL(clockbase), %a0 movl %a0@, %d0 movl %d0, %a0@ btst #2, %d0 jeq 1f addql #1,_C_LABEL(m68k_intr_evcnt)+CLOCK_INTRCNT lea %sp@(0), %a1 | a1 = &clockframe movl %a1, %sp@- jbsr _C_LABEL(hardclock) | hardclock(&frame) addql #4, %sp jra 2f 1: movl %d0, %sp@- jbsr _C_LABEL(otherclock) addql #4, %sp 2: INTERRUPT_RESTOREREG jra _ASM_LABEL(rei) | all done ENTRY_NOPROFILE(lev7intr) /* level 7: parity errors, reset key */ addql #1,_C_LABEL(m68k_intr_evcnt)+NMI_INTRCNT clrl %sp@- moveml #0xFFFF,%sp@- | save registers movl %usp,%a0 | and save movl %a0,%sp@(FR_SP) | the user stack pointer jbsr _C_LABEL(nmihand) | call handler movl %sp@(FR_SP),%a0 | restore movl %a0,%usp | user SP moveml %sp@+,#0x7FFF | and remaining registers addql #8,%sp | pop SP and stack adjust 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 identifying 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 pea %sp@(12) | fp == address of trap frame jbsr _C_LABEL(trap) | go handle it lea %sp@(16),%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 pea %sp@(12) | fp == address of trap frame jbsr _C_LABEL(trap) | go handle it lea %sp@(16),%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 /* * Primitives */ /* * Use common m68k process/lwp switch and context save subroutines. */ #define FPCOPROC /* XXX: Temporarily required */ #include #if defined(M68040) 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 /* * 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 /* * _delay(u_int N) * * Delay for at least (N/256) microseconds. * This routine depends on the variable: delay_divisor * which should be set based on the CPU clock rate. */ ENTRY_NOPROFILE(_delay) | d0 = arg = (usecs << 8) movl %sp@(4),%d0 | d1 = delay_divisor movl _C_LABEL(delay_divisor),%d1 L_delay: subl %d1,%d0 jgt L_delay rts ENTRY_NOPROFILE(doboot) movl #0x5c00c060, %d0 | want phys addressing .long 0x4e7b0006 | movc d0,dtt0 movl #1, 0x5c00b800 | reset stop #0x2700 | paranoia .data GLOBAL(mmutype) .long MMU_HP | default to HP MMU GLOBAL(cputype) .long CPU_68020 | default to 68020 CPU GLOBAL(fputype) .long FPU_68881 | default to 68881 FPU GLOBAL(prototc) .long 0 | prototype translation control #ifdef DEBUG .globl fulltflush, fullcflush fulltflush: .long 0 fullcflush: .long 0 #endif