/* $NetBSD: locore.s,v 1.128 2026/03/30 03:32:22 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) 1993 Adam Glass * 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_kgdb.h" #include "opt_lockdebug.h" #include "assym.h" #include <machine/asm.h> #include <machine/trap.h> | Remember this is a fun project! | 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) | This is the entry point, as well as the end of the temporary stack | used during process switch (one 8K page ending at start) ASGLOBAL(tmpstk) ASGLOBAL(start) | First we need to set it up so we can access the sun MMU, and be otherwise | undisturbed. Until otherwise noted, all code must be position independent | as the boot loader put us low in memory, but we are linked high. movw #PSL_HIGHIPL,%sr | no interrupts moveq #FC_CONTROL,%d0 | make movs access "control" movc %d0,%sfc | space where the sun3 designers movc %d0,%dfc | put all the "useful" stuff | Set context zero and stay there until pmap_bootstrap. moveq #0,%d0 movsb %d0,CONTEXT_REG | In order to "move" the kernel to high memory, we are going to copy the | first 4 Mb of pmegs such that we will be mapped at the linked address. | This is all done by copying in the segment map (top-level MMU table). | We will unscramble which PMEGs we actually need later. movl #(SEGMAP_BASE+0),%a0 | src movl #(SEGMAP_BASE+KERNBASE3),%a1 | dst movl #(0x400000/NBSG),%d0 | count L_per_pmeg: movsb %a0@,%d1 | copy segmap entry movsb %d1,%a1@ addl #NBSG,%a0 | increment pointers addl #NBSG,%a1 subql #1,%d0 | decrement count bgt L_per_pmeg | Kernel is now double mapped at zero and KERNBASE. | Force a long jump to the relocated code (high VA). movl #IC_CLEAR,%d0 | Flush the I-cache movc %d0,%cacr jmp L_high_code:l | long jump L_high_code: | We are now running in the correctly relocated kernel, so | we are no longer restricted to position-independent code. | Do bootstrap stuff needed before main() gets called. | Make sure the initial frame pointer is zero so that | the backtrace algorithm used by KGDB terminates nicely. | | _bootstrap() returns lwp0 SP in %a0 lea _ASM_LABEL(tmpstk),%sp jsr _C_LABEL(_bootstrap) | See locore2.c movl %a0,%sp | now running on lwp0's stack movl #0,%a6 | terminate the stack back trace jra _C_LABEL(main) | main() (never returns) | That is all the assembly startup code we need on the sun3! | The rest of this is like the hp300/locore.s where possible. /* * Other exceptions only cause four and six word stack frame and require * no post-trap stack adjustment. */ /* * Interrupt handlers. Most are auto-vectored, * and hard-wired the same way on all sun3 models. * Format in the stack is: * %d0,%d1,%a0,%a1, sr, pc, vo */ /* clock: see clock.c */ #ifdef __ELF__ .align 4 #else .align 2 #endif GLOBAL(_isr_clock) INTERRUPT_SAVEREG jbsr _C_LABEL(clock_intr) INTERRUPT_RESTOREREG jra _ASM_LABEL(rei) /* * Initialization is at the beginning of this file, because the * kernel entry point needs to be at zero for compatibility with * the Sun boot loader. This works on Sun machines because the * interrupt vector table for reset is NOT at address zero. * (The MMU has a "boot" bit that forces access to the PROM) */ /* loadustp, ptest_addr */ /* * void set_segmap_allctx(vaddr_t va, int sme) */ ENTRY(set_segmap_allctx) linkw %fp,#0 moveml #0x3000,%sp@- movl 8(%fp),%d3 | d3 = va andl #0xffffffc,%d3 bset #29,%d3 movl %d3,%a1 | a1 = ctrladdr, d3 avail movl 12(%fp),%d1 | d1 = sme moveq #FC_CONTROL,%d0 movl #CONTEXT_REG,%a0 | a0 = ctxreg movc %sfc,%d3 | d3 = oldsfc movc %d0,%sfc movsb %a0@,%d2 andi #7,%d2 | d2 = oldctx movc %d3,%sfc | restore sfc, d3 avail movc %dfc,%d3 | d3 = olddfc movc %d0,%dfc movl #(CONTEXT_NUM - 1),%d0 | d0 = ctx number 1: movsb %d0,%a0@ | change to ctx movsb %d1,%a1@ | set segmap dbf %d0,1b | loop setting each ctx movsb %d2,%a0@ | restore ctx movc %d3,%dfc | restore dfc moveml %sp@+,#0x000c unlk %fp rts | Define some addresses, mostly so DDB can print useful info. | Not using _C_LABEL() here because these symbols are never | referenced by any C code, and if the leading underscore | ever goes away, these lines turn into syntax errors... .set _KERNBASE3,KERNBASE3 .set _MONSTART,SUN3_MONSTART .set _PROM_BASE,SUN3_PROM_BASE .set _MONEND,SUN3_MONEND |The end!
