locore2.c revision 1.14
1/* $NetBSD: locore2.c,v 1.14 1997/04/25 18:29:58 gwr Exp $ */ 2 3/*- 4 * Copyright (c) 1996 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Gordon W. Ross and Jeremy Cooper. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include <sys/param.h> 40#include <sys/systm.h> 41#include <sys/proc.h> 42#include <sys/reboot.h> 43#include <sys/user.h> 44#include <sys/exec_aout.h> 45 46#include <vm/vm.h> 47 48#include <machine/cpu.h> 49#include <machine/db_machdep.h> 50#include <machine/dvma.h> 51#include <machine/mon.h> 52#include <machine/pte.h> 53#include <machine/pmap.h> 54#include <machine/obio.h> 55#include <machine/machdep.h> 56 57#include <sun3/sun3/interreg.h> 58#include <sun3/sun3/vector.h> 59 60/* This is defined in locore.s */ 61extern char kernel_text[]; 62 63/* These are defined by the linker */ 64extern char etext[], edata[], end[]; 65char *esym; /* DDB */ 66 67/* 68 * XXX: m68k common code needs these... 69 * ... but this port does not need to deal with anything except 70 * an mc68030, so these two variables are always ignored. 71 * XXX: Need to do something about <m68k/include/cpu.h> 72 */ 73int cputype = 1; /* CPU_68030 */ 74int mmutype = -1; /* MMU_68030 */ 75 76/* 77 * Now our own stuff. 78 */ 79 80struct user *proc0paddr; /* proc[0] pcb address (u-area VA) */ 81extern struct pcb *curpcb; 82 83/* First C code called by locore.s */ 84void _bootstrap __P((struct exec)); 85 86static void _vm_init __P((struct exec *kehp)); 87 88 89#if defined(DDB) && !defined(SYMTAB_SPACE) 90static void _save_symtab __P((struct exec *kehp)); 91 92/* 93 * Preserve DDB symbols and strings by setting esym. 94 */ 95static void 96_save_symtab(kehp) 97 struct exec *kehp; /* kernel exec header */ 98{ 99 int x, *symsz, *strsz; 100 char *endp; 101 char *errdesc = "?"; 102 103 /* 104 * First, sanity-check the exec header. 105 */ 106 if ((kehp->a_midmag & 0xFFF0) != 0x0100) { 107 errdesc = "magic"; 108 goto err; 109 } 110 /* Boundary between text and data varries a little. */ 111 x = kehp->a_text + kehp->a_data; 112 if (x != (edata - kernel_text)) { 113 errdesc = "a_text+a_data"; 114 goto err; 115 } 116 if (kehp->a_bss != (end - edata)) { 117 errdesc = "a_bss"; 118 goto err; 119 } 120 if (kehp->a_entry != (int)kernel_text) { 121 errdesc = "a_entry"; 122 goto err; 123 } 124 if (kehp->a_trsize || kehp->a_drsize) { 125 errdesc = "a_Xrsize"; 126 goto err; 127 } 128 /* The exec header looks OK... */ 129 130 /* Check the symtab length word. */ 131 endp = end; 132 symsz = (int*)endp; 133 if (kehp->a_syms != *symsz) { 134 errdesc = "a_syms"; 135 goto err; 136 } 137 endp += sizeof(int); /* past length word */ 138 endp += *symsz; /* past nlist array */ 139 140 /* Sanity-check the string table length. */ 141 strsz = (int*)endp; 142 if ((*strsz < 4) || (*strsz > 0x80000)) { 143 errdesc = "strsize"; 144 goto err; 145 } 146 147 /* Success! We have a valid symbol table! */ 148 endp += *strsz; /* past strings */ 149 esym = endp; 150 return; 151 152 err: 153 mon_printf("_save_symtab: bad %s\n", errdesc); 154} 155#endif /* DDB && !SYMTAB_SPACE */ 156 157/* 158 * This function is called from _bootstrap() to initialize 159 * pre-vm-sytem virtual memory. All this really does is to 160 * set virtual_avail to the first page following preloaded 161 * data (i.e. the kernel and its symbol table) and special 162 * things that may be needed very early (proc0 upages). 163 * Once that is done, pmap_bootstrap() is called to do the 164 * usual preparations for our use of the MMU. 165 */ 166static void 167_vm_init(kehp) 168 struct exec *kehp; /* kernel exec header */ 169{ 170 vm_offset_t nextva; 171 172 /* 173 * First, reserve our symbol table which might have been 174 * loaded after our BSS area by the boot loader. However, 175 * if DDB is not part of this kernel, ignore the symbols. 176 */ 177 esym = end; 178#if defined(DDB) && !defined(SYMTAB_SPACE) 179 /* This will advance esym past the symbols. */ 180 _save_symtab(kehp); 181#endif 182 183 /* 184 * Steal some special-purpose, already mapped pages. 185 * Note: msgbuf is setup in machdep.c:cpu_startup() 186 */ 187 nextva = _round_page(esym); 188 189 /* 190 * Setup the u-area pages (stack, etc.) for proc0. 191 * This is done very early (here) to make sure the 192 * fault handler works in case we hit an early bug. 193 * (The fault handler may reference proc0 stuff.) 194 */ 195 proc0paddr = (struct user *) nextva; 196 nextva += USPACE; 197 bzero((caddr_t)proc0paddr, USPACE); 198 proc0.p_addr = proc0paddr; 199 200 /* 201 * Now that proc0 exists, make it the "current" one. 202 */ 203 curproc = &proc0; 204 curpcb = &proc0paddr->u_pcb; 205 206 /* 207 * Call pmap_bootstrap() so that we may begin using 208 * pmap_enter_kernel() and pmap_bootstrap_alloc(). 209 */ 210 pmap_bootstrap(nextva); 211} 212 213 214/* 215 * This is called from locore.s just after the kernel is remapped 216 * to its proper address, but before the call to main(). The work 217 * done here corresponds to various things done in locore.s on the 218 * hp300 port (and other m68k) but which we prefer to do in C code. 219 * Also do setup specific to the Sun PROM monitor and IDPROM here. 220 */ 221void 222_bootstrap(keh) 223 struct exec keh; /* kernel exec header */ 224{ 225 226 /* First, Clear BSS. */ 227 bzero(edata, end - edata); 228 229 /* set v_handler, get boothowto */ 230 sunmon_init(); 231 232 /* 233 * Find and save OBIO mappings needed early, 234 * and call some init functions. 235 */ 236 obio_init(); 237 238 /* handle kernel mapping, pmap_bootstrap(), etc. */ 239 _vm_init(&keh); 240 241 /* 242 * Point interrupts/exceptions to our vector table. 243 * (Until now, we use the one setup by the PROM.) 244 * 245 * This is done after obio_init() / intreg_init() finds 246 * the interrupt register and disables the NMI clock so 247 * it will not cause "spurrious level 7" complaints. 248 * Done after _vm_init so the PROM can debug that. 249 */ 250 setvbr((void **)vector_table); 251 252 /* Interrupts are enabled later, after autoconfig. */ 253} 254