locore2.c revision 1.19
1/* $NetBSD: locore2.c,v 1.19 1998/02/05 04:57:58 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/idprom.h> 52#include <machine/leds.h> 53#include <machine/mon.h> 54#include <machine/pmap.h> 55#include <machine/pte.h> 56 57#include <sun3/sun3/interreg.h> 58#include <sun3/sun3/machdep.h> 59#include <sun3/sun3/vector.h> 60 61/* This is defined in locore.s */ 62extern char kernel_text[]; 63 64/* These are defined by the linker */ 65extern char etext[], edata[], end[]; 66char *esym; /* DDB */ 67 68/* 69 * XXX: m68k common code needs these... 70 * ... but this port does not need to deal with anything except 71 * an mc68030, so these two variables are always ignored. 72 * XXX: Need to do something about <m68k/include/cpu.h> 73 */ 74int cputype = 1; /* CPU_68030 */ 75int mmutype = -1; /* MMU_68030 */ 76 77/* 78 * Now our own stuff. 79 */ 80 81struct user *proc0paddr; /* proc[0] pcb address (u-area VA) */ 82extern struct pcb *curpcb; 83 84/* First C code called by locore.s */ 85void _bootstrap __P((struct exec)); 86 87static void _vm_init __P((struct exec *kehp)); 88 89 90#if defined(DDB) && !defined(SYMTAB_SPACE) 91static void _save_symtab __P((struct exec *kehp)); 92 93/* 94 * Preserve DDB symbols and strings by setting esym. 95 */ 96static void 97_save_symtab(kehp) 98 struct exec *kehp; /* kernel exec header */ 99{ 100 int x, *symsz, *strsz; 101 char *endp; 102 char *errdesc = "?"; 103 104 /* 105 * First, sanity-check the exec header. 106 */ 107 if ((kehp->a_midmag & 0xFFF0) != 0x0100) { 108 errdesc = "magic"; 109 goto err; 110 } 111 /* Boundary between text and data varries a little. */ 112 x = kehp->a_text + kehp->a_data; 113 if (x != (edata - kernel_text)) { 114 errdesc = "a_text+a_data"; 115 goto err; 116 } 117 if (kehp->a_bss != (end - edata)) { 118 errdesc = "a_bss"; 119 goto err; 120 } 121 if (kehp->a_entry != (int)kernel_text) { 122 errdesc = "a_entry"; 123 goto err; 124 } 125 if (kehp->a_trsize || kehp->a_drsize) { 126 errdesc = "a_Xrsize"; 127 goto err; 128 } 129 /* The exec header looks OK... */ 130 131 /* Check the symtab length word. */ 132 endp = end; 133 symsz = (int*)endp; 134 if (kehp->a_syms != *symsz) { 135 errdesc = "a_syms"; 136 goto err; 137 } 138 endp += sizeof(int); /* past length word */ 139 endp += *symsz; /* past nlist array */ 140 141 /* Sanity-check the string table length. */ 142 strsz = (int*)endp; 143 if ((*strsz < 4) || (*strsz > 0x80000)) { 144 errdesc = "strsize"; 145 goto err; 146 } 147 148 /* Success! We have a valid symbol table! */ 149 endp += *strsz; /* past strings */ 150 esym = endp; 151 return; 152 153 err: 154 mon_printf("_save_symtab: bad %s\n", errdesc); 155} 156#endif /* DDB && !SYMTAB_SPACE */ 157 158/* 159 * This function is called from _bootstrap() to initialize 160 * pre-vm-sytem virtual memory. All this really does is to 161 * set virtual_avail to the first page following preloaded 162 * data (i.e. the kernel and its symbol table) and special 163 * things that may be needed very early (proc0 upages). 164 * Once that is done, pmap_bootstrap() is called to do the 165 * usual preparations for our use of the MMU. 166 */ 167static void 168_vm_init(kehp) 169 struct exec *kehp; /* kernel exec header */ 170{ 171 vm_offset_t nextva; 172 173 /* 174 * First preserve our symbol table, which might have been 175 * loaded after our BSS area by the boot loader. However, 176 * if DDB is not part of this kernel, ignore the symbols. 177 */ 178 esym = end; 179#if defined(DDB) && !defined(SYMTAB_SPACE) 180 /* This will advance esym past the symbols. */ 181 _save_symtab(kehp); 182#endif 183 184 /* 185 * Steal some special-purpose, already mapped pages. 186 * Note: msgbuf is setup in machdep.c:cpu_startup() 187 */ 188 nextva = m68k_round_page(esym); 189 190 /* 191 * Setup the u-area pages (stack, etc.) for proc0. 192 * This is done very early (here) to make sure the 193 * fault handler works in case we hit an early bug. 194 * (The fault handler may reference proc0 stuff.) 195 */ 196 proc0paddr = (struct user *) nextva; 197 nextva += USPACE; 198 bzero((caddr_t)proc0paddr, USPACE); 199 proc0.p_addr = proc0paddr; 200 201 /* 202 * Now that proc0 exists, make it the "current" one. 203 */ 204 curproc = &proc0; 205 curpcb = &proc0paddr->u_pcb; 206 207 /* 208 * Call pmap_bootstrap() so that we may begin using 209 * pmap_enter_kernel() and pmap_bootstrap_alloc(). 210 */ 211 pmap_bootstrap(nextva); 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 /* Handle kernel mapping, pmap_bootstrap(), etc. */ 233 _vm_init(&keh); 234 235 /* 236 * Find and save OBIO mappings needed early, 237 * and call some init functions. 238 */ 239 obio_init(); 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 /* Interrupts are enabled later, after autoconfig. */ 252 253 /* 254 * Find the IDPROM and copy it to memory. 255 * Needs obio_init and setvbr earlier. 256 */ 257 idprom_init(); 258 259 /* 260 * Turn on the LEDs so we know power is on. 261 * Needs idprom_init and obio_init earlier. 262 */ 263 leds_init(); 264} 265