1 /* $NetBSD: locore2.c,v 1.30 2005/01/22 15:36:11 chs 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/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: locore2.c,v 1.30 2005/01/22 15:36:11 chs Exp $"); 41 42 #include "opt_ddb.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/proc.h> 47 #include <sys/reboot.h> 48 #include <sys/user.h> 49 #define ELFSIZE 32 50 #include <sys/exec_elf.h> 51 52 #include <uvm/uvm_extern.h> 53 54 #include <machine/cpu.h> 55 #include <machine/db_machdep.h> 56 #include <machine/dvma.h> 57 #include <machine/idprom.h> 58 #include <machine/leds.h> 59 #include <machine/mon.h> 60 #include <machine/pmap.h> 61 #include <machine/pte.h> 62 63 #include <sun3/sun3/interreg.h> 64 #include <sun3/sun3/machdep.h> 65 #include <sun3/sun3/vector.h> 66 67 /* This is defined in locore.s */ 68 extern char kernel_text[]; 69 70 /* These are defined by the linker */ 71 extern char etext[], edata[], end[]; 72 int nsym; 73 char *ssym, *esym; 74 75 /* 76 * XXX: m68k common code needs these... 77 * ... but this port does not need to deal with anything except 78 * an mc68030, so these two variables are always ignored. 79 */ 80 int cputype = CPU_68030; 81 int mmutype = MMU_68030; 82 83 /* 84 * Now our own stuff. 85 */ 86 87 struct user *proc0paddr; /* proc[0] pcb address (u-area VA) */ 88 extern struct pcb *curpcb; 89 90 /* First C code called by locore.s */ 91 void _bootstrap(void); 92 93 static void _vm_init(void); 94 95 #if defined(DDB) 96 static void _save_symtab(void); 97 98 /* 99 * Preserve DDB symbols and strings by setting esym. 100 */ 101 static void 102 _save_symtab(void) 103 { 104 int i; 105 Elf_Ehdr *ehdr; 106 Elf_Shdr *shp; 107 vaddr_t minsym, maxsym; 108 109 /* 110 * Check the ELF headers. 111 */ 112 113 ehdr = (void *)end; 114 if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) != 0 || 115 ehdr->e_ident[EI_CLASS] != ELFCLASS32) { 116 mon_printf("_save_symtab: bad ELF magic\n"); 117 return; 118 } 119 120 /* 121 * Find the end of the symbols and strings. 122 */ 123 124 maxsym = 0; 125 minsym = ~maxsym; 126 shp = (Elf_Shdr *)(end + ehdr->e_shoff); 127 for (i = 0; i < ehdr->e_shnum; i++) { 128 if (shp[i].sh_type != SHT_SYMTAB && 129 shp[i].sh_type != SHT_STRTAB) { 130 continue; 131 } 132 minsym = min(minsym, (vaddr_t)end + shp[i].sh_offset); 133 maxsym = max(maxsym, (vaddr_t)end + shp[i].sh_offset + 134 shp[i].sh_size); 135 } 136 nsym = 1; 137 ssym = (char *)ehdr; 138 esym = (char *)maxsym; 139 } 140 #endif /* DDB */ 141 142 /* 143 * This function is called from _bootstrap() to initialize 144 * pre-vm-sytem virtual memory. All this really does is to 145 * set virtual_avail to the first page following preloaded 146 * data (i.e. the kernel and its symbol table) and special 147 * things that may be needed very early (lwp0 upages). 148 * Once that is done, pmap_bootstrap() is called to do the 149 * usual preparations for our use of the MMU. 150 */ 151 static void 152 _vm_init(void) 153 { 154 vaddr_t nextva; 155 156 /* 157 * First preserve our symbol table, which might have been 158 * loaded after our BSS area by the boot loader. However, 159 * if DDB is not part of this kernel, ignore the symbols. 160 */ 161 esym = end + 4; 162 #if defined(DDB) 163 /* This will advance esym past the symbols. */ 164 _save_symtab(); 165 #endif 166 167 /* 168 * Steal some special-purpose, already mapped pages. 169 * Note: msgbuf is setup in machdep.c:cpu_startup() 170 */ 171 nextva = m68k_round_page(esym); 172 173 /* 174 * Setup the u-area pages (stack, etc.) for lwp0. 175 * This is done very early (here) to make sure the 176 * fault handler works in case we hit an early bug. 177 * (The fault handler may reference lwp0 stuff.) 178 */ 179 proc0paddr = (struct user *) nextva; 180 nextva += USPACE; 181 memset((caddr_t)proc0paddr, 0, USPACE); 182 lwp0.l_addr = proc0paddr; 183 184 /* 185 * Now that lwp0 exists, make it the "current" one. 186 */ 187 curlwp = &lwp0; 188 curpcb = &proc0paddr->u_pcb; 189 190 /* This does most of the real work. */ 191 pmap_bootstrap(nextva); 192 } 193 194 /* 195 * This is called from locore.s just after the kernel is remapped 196 * to its proper address, but before the call to main(). The work 197 * done here corresponds to various things done in locore.s on the 198 * hp300 port (and other m68k) but which we prefer to do in C code. 199 * Also do setup specific to the Sun PROM monitor and IDPROM here. 200 */ 201 void 202 _bootstrap(void) 203 { 204 205 /* First, Clear BSS. */ 206 memset(edata, 0, end - edata); 207 208 /* Set v_handler, get boothowto. */ 209 sunmon_init(); 210 211 /* Handle kernel mapping, pmap_bootstrap(), etc. */ 212 _vm_init(); 213 214 /* 215 * Find and save OBIO mappings needed early, 216 * and call some init functions. 217 */ 218 obio_init(); 219 220 /* 221 * Point interrupts/exceptions to our vector table. 222 * (Until now, we use the one setup by the PROM.) 223 * 224 * This is done after obio_init() / intreg_init() finds 225 * the interrupt register and disables the NMI clock so 226 * it will not cause "spurrious level 7" complaints. 227 * Done after _vm_init so the PROM can debug that. 228 */ 229 setvbr((void **)vector_table); 230 /* Interrupts are enabled later, after autoconfig. */ 231 232 /* 233 * Find the IDPROM and copy it to memory. 234 * Needs obio_init and setvbr earlier. 235 */ 236 idprom_init(); 237 238 /* 239 * Turn on the LEDs so we know power is on. 240 * Needs idprom_init and obio_init earlier. 241 */ 242 leds_init(); 243 } 244