1 /* $NetBSD: locore2.c,v 1.38 2009/11/30 16:09:14 he 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: locore2.c,v 1.38 2009/11/30 16:09:14 he Exp $"); 34 35 #include "opt_ddb.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/proc.h> 40 #include <sys/reboot.h> 41 #define ELFSIZE 32 42 #include <sys/exec_elf.h> 43 44 #include <uvm/uvm_extern.h> 45 46 #include <machine/cpu.h> 47 #include <machine/db_machdep.h> 48 #include <machine/dvma.h> 49 #include <machine/idprom.h> 50 #include <machine/leds.h> 51 #include <machine/mon.h> 52 #include <machine/pmap.h> 53 #include <machine/pte.h> 54 55 #include <sun3/sun3/interreg.h> 56 #include <sun3/sun3/machdep.h> 57 #include <sun68k/sun68k/vector.h> 58 59 /* This is defined in locore.s */ 60 extern char kernel_text[]; 61 62 /* These are defined by the linker */ 63 extern char etext[], edata[], end[]; 64 int nsym; 65 char *ssym, *esym; 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 */ 72 int cputype = CPU_68030; 73 int mmutype = MMU_68030; 74 75 /* 76 * Now our own stuff. 77 */ 78 79 extern struct pcb *curpcb; 80 81 /* First C code called by locore.s */ 82 void _bootstrap(void); 83 84 static void _vm_init(void); 85 86 #if defined(DDB) 87 static void _save_symtab(void); 88 89 /* 90 * Preserve DDB symbols and strings by setting esym. 91 */ 92 static void 93 _save_symtab(void) 94 { 95 int i; 96 Elf_Ehdr *ehdr; 97 Elf_Shdr *shp; 98 vaddr_t minsym, maxsym; 99 100 /* 101 * Check the ELF headers. 102 */ 103 104 ehdr = (void *)end; 105 if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) != 0 || 106 ehdr->e_ident[EI_CLASS] != ELFCLASS32) { 107 mon_printf("_save_symtab: bad ELF magic\n"); 108 return; 109 } 110 111 /* 112 * Find the end of the symbols and strings. 113 */ 114 115 maxsym = 0; 116 minsym = ~maxsym; 117 shp = (Elf_Shdr *)(end + ehdr->e_shoff); 118 for (i = 0; i < ehdr->e_shnum; i++) { 119 if (shp[i].sh_type != SHT_SYMTAB && 120 shp[i].sh_type != SHT_STRTAB) { 121 continue; 122 } 123 minsym = min(minsym, (vaddr_t)end + shp[i].sh_offset); 124 maxsym = max(maxsym, (vaddr_t)end + shp[i].sh_offset + 125 shp[i].sh_size); 126 } 127 nsym = 1; 128 ssym = (char *)ehdr; 129 esym = (char *)maxsym; 130 } 131 #endif /* DDB */ 132 133 /* 134 * This function is called from _bootstrap() to initialize 135 * pre-vm-sytem virtual memory. All this really does is to 136 * set virtual_avail to the first page following preloaded 137 * data (i.e. the kernel and its symbol table) and special 138 * things that may be needed very early (lwp0 upages). 139 * Once that is done, pmap_bootstrap() is called to do the 140 * usual preparations for our use of the MMU. 141 */ 142 static void 143 _vm_init(void) 144 { 145 vaddr_t nextva; 146 147 /* 148 * First preserve our symbol table, which might have been 149 * loaded after our BSS area by the boot loader. However, 150 * if DDB is not part of this kernel, ignore the symbols. 151 */ 152 esym = end + 4; 153 #if defined(DDB) 154 /* This will advance esym past the symbols. */ 155 _save_symtab(); 156 #endif 157 158 /* 159 * Steal some special-purpose, already mapped pages. 160 * Note: msgbuf is setup in machdep.c:cpu_startup() 161 */ 162 nextva = m68k_round_page(esym); 163 164 /* 165 * Setup the u-area pages (stack, etc.) for lwp0. 166 * This is done very early (here) to make sure the 167 * fault handler works in case we hit an early bug. 168 * (The fault handler may reference lwp0 stuff.) 169 */ 170 uvm_lwp_setuarea(&lwp0, nextva); 171 memset((void *)nextva, 0, USPACE); 172 173 nextva += USPACE; 174 175 /* 176 * Now that lwp0 exists, make it the "current" one. 177 */ 178 curlwp = &lwp0; 179 curpcb = lwp_getpcb(&lwp0); 180 181 /* This does most of the real work. */ 182 pmap_bootstrap(nextva); 183 } 184 185 /* 186 * This is called from locore.s just after the kernel is remapped 187 * to its proper address, but before the call to main(). The work 188 * done here corresponds to various things done in locore.s on the 189 * hp300 port (and other m68k) but which we prefer to do in C code. 190 * Also do setup specific to the Sun PROM monitor and IDPROM here. 191 */ 192 void 193 _bootstrap(void) 194 { 195 196 /* First, Clear BSS. */ 197 memset(edata, 0, end - edata); 198 199 /* Set v_handler, get boothowto. */ 200 sunmon_init(); 201 202 /* Handle kernel mapping, pmap_bootstrap(), etc. */ 203 _vm_init(); 204 205 /* 206 * Find and save OBIO mappings needed early, 207 * and call some init functions. 208 */ 209 obio_init(); 210 211 /* 212 * Point interrupts/exceptions to our vector table. 213 * (Until now, we use the one setup by the PROM.) 214 * 215 * This is done after obio_init() / intreg_init() finds 216 * the interrupt register and disables the NMI clock so 217 * it will not cause "spurrious level 7" complaints. 218 * Done after _vm_init so the PROM can debug that. 219 */ 220 setvbr((void **)vector_table); 221 /* Interrupts are enabled later, after autoconfig. */ 222 223 /* 224 * Find the IDPROM and copy it to memory. 225 * Needs obio_init and setvbr earlier. 226 */ 227 idprom_init(); 228 229 /* 230 * Turn on the LEDs so we know power is on. 231 * Needs idprom_init and obio_init earlier. 232 */ 233 leds_init(); 234 } 235