1 /* $NetBSD: arm32_machdep.c,v 1.52 2007/10/17 19:53:30 garbled Exp $ */ 2 3 /* 4 * Copyright (c) 1994-1998 Mark Brinicombe. 5 * Copyright (c) 1994 Brini. 6 * All rights reserved. 7 * 8 * This code is derived from software written for Brini by Mark Brinicombe 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 Mark Brinicombe 21 * for the NetBSD Project. 22 * 4. The name of the company nor the name of the author may be used to 23 * endorse or promote products derived from this software without specific 24 * prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 30 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 31 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * Machine dependant functions for kernel setup 39 * 40 * Created : 17/09/94 41 * Updated : 18/04/01 updated for new wscons 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: arm32_machdep.c,v 1.52 2007/10/17 19:53:30 garbled Exp $"); 46 47 #include "opt_md.h" 48 #include "opt_pmap_debug.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/reboot.h> 53 #include <sys/proc.h> 54 #include <sys/user.h> 55 #include <sys/kernel.h> 56 #include <sys/mbuf.h> 57 #include <sys/mount.h> 58 #include <sys/buf.h> 59 #include <sys/msgbuf.h> 60 #include <sys/device.h> 61 #include <uvm/uvm_extern.h> 62 #include <sys/sysctl.h> 63 #include <sys/cpu.h> 64 65 #include <dev/cons.h> 66 67 #include <arm/arm32/katelib.h> 68 #include <arm/arm32/machdep.h> 69 #include <machine/bootconfig.h> 70 71 #include "opt_ipkdb.h" 72 #include "md.h" 73 74 struct vm_map *exec_map = NULL; 75 struct vm_map *mb_map = NULL; 76 struct vm_map *phys_map = NULL; 77 78 extern int physmem; 79 80 #if NMD > 0 && defined(MEMORY_DISK_HOOKS) && !defined(MEMORY_DISK_ROOT_SIZE) 81 extern size_t md_root_size; /* Memory disc size */ 82 #endif /* NMD && MEMORY_DISK_HOOKS && !MEMORY_DISK_ROOT_SIZE */ 83 84 pv_addr_t kernelstack; 85 86 /* the following is used externally (sysctl_hw) */ 87 char machine[] = MACHINE; /* from <machine/param.h> */ 88 char machine_arch[] = MACHINE_ARCH; /* from <machine/param.h> */ 89 90 /* Our exported CPU info; we can have only one. */ 91 struct cpu_info cpu_info_store; 92 93 void * msgbufaddr; 94 extern paddr_t msgbufphys; 95 96 int kernel_debug = 0; 97 98 struct user *proc0paddr; 99 100 /* exported variable to be filled in by the bootloaders */ 101 char *booted_kernel; 102 103 104 /* Prototypes */ 105 106 void data_abort_handler __P((trapframe_t *frame)); 107 void prefetch_abort_handler __P((trapframe_t *frame)); 108 extern void configure __P((void)); 109 110 /* 111 * arm32_vector_init: 112 * 113 * Initialize the vector page, and select whether or not to 114 * relocate the vectors. 115 * 116 * NOTE: We expect the vector page to be mapped at its expected 117 * destination. 118 */ 119 void 120 arm32_vector_init(vaddr_t va, int which) 121 { 122 extern unsigned int page0[], page0_data[]; 123 unsigned int *vectors = (int *) va; 124 unsigned int *vectors_data = vectors + (page0_data - page0); 125 int vec; 126 127 /* 128 * Loop through the vectors we're taking over, and copy the 129 * vector's insn and data word. 130 */ 131 for (vec = 0; vec < ARM_NVEC; vec++) { 132 if ((which & (1 << vec)) == 0) { 133 /* Don't want to take over this vector. */ 134 continue; 135 } 136 vectors[vec] = page0[vec]; 137 vectors_data[vec] = page0_data[vec]; 138 } 139 140 /* Now sync the vectors. */ 141 cpu_icache_sync_range(va, (ARM_NVEC * 2) * sizeof(u_int)); 142 143 vector_page = va; 144 145 if (va == ARM_VECTORS_HIGH) { 146 /* 147 * Assume the MD caller knows what it's doing here, and 148 * really does want the vector page relocated. 149 * 150 * Note: This has to be done here (and not just in 151 * cpu_setup()) because the vector page needs to be 152 * accessible *before* cpu_startup() is called. 153 * Think ddb(9) ... 154 * 155 * NOTE: If the CPU control register is not readable, 156 * this will totally fail! We'll just assume that 157 * any system that has high vector support has a 158 * readable CPU control register, for now. If we 159 * ever encounter one that does not, we'll have to 160 * rethink this. 161 */ 162 cpu_control(CPU_CONTROL_VECRELOC, CPU_CONTROL_VECRELOC); 163 } 164 } 165 166 /* 167 * Debug function just to park the CPU 168 */ 169 170 void 171 halt() 172 { 173 while (1) 174 cpu_sleep(0); 175 } 176 177 178 /* Sync the discs and unmount the filesystems */ 179 180 void 181 bootsync(void) 182 { 183 static int bootsyncdone = 0; 184 185 if (bootsyncdone) return; 186 187 bootsyncdone = 1; 188 189 /* Make sure we can still manage to do things */ 190 if (GetCPSR() & I32_bit) { 191 /* 192 * If we get here then boot has been called without RB_NOSYNC 193 * and interrupts were disabled. This means the boot() call 194 * did not come from a user process e.g. shutdown, but must 195 * have come from somewhere in the kernel. 196 */ 197 IRQenable; 198 printf("Warning IRQ's disabled during boot()\n"); 199 } 200 201 vfs_shutdown(); 202 } 203 204 /* 205 * void cpu_startup(void) 206 * 207 * Machine dependant startup code. 208 * 209 */ 210 void 211 cpu_startup() 212 { 213 vaddr_t minaddr; 214 vaddr_t maxaddr; 215 u_int loop; 216 char pbuf[9]; 217 218 /* Set the CPU control register */ 219 cpu_setup(boot_args); 220 221 /* Lock down zero page */ 222 vector_page_setprot(VM_PROT_READ); 223 224 /* 225 * Give pmap a chance to set up a few more things now the vm 226 * is initialised 227 */ 228 pmap_postinit(); 229 230 /* 231 * Initialize error message buffer (at end of core). 232 */ 233 234 /* msgbufphys was setup during the secondary boot strap */ 235 for (loop = 0; loop < btoc(MSGBUFSIZE); ++loop) 236 pmap_kenter_pa((vaddr_t)msgbufaddr + loop * PAGE_SIZE, 237 msgbufphys + loop * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE); 238 pmap_update(pmap_kernel()); 239 initmsgbuf(msgbufaddr, round_page(MSGBUFSIZE)); 240 241 /* 242 * Identify ourselves for the msgbuf (everything printed earlier will 243 * not be buffered). 244 */ 245 printf("%s%s", copyright, version); 246 247 format_bytes(pbuf, sizeof(pbuf), arm_ptob(physmem)); 248 printf("total memory = %s\n", pbuf); 249 250 minaddr = 0; 251 252 /* 253 * Allocate a submap for exec arguments. This map effectively 254 * limits the number of processes exec'ing at any time. 255 */ 256 exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 257 16*NCARGS, VM_MAP_PAGEABLE, false, NULL); 258 259 /* 260 * Allocate a submap for physio 261 */ 262 phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 263 VM_PHYS_SIZE, 0, false, NULL); 264 265 /* 266 * Finally, allocate mbuf cluster submap. 267 */ 268 mb_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 269 nmbclusters * mclbytes, VM_MAP_INTRSAFE, 270 false, NULL); 271 272 format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free)); 273 printf("avail memory = %s\n", pbuf); 274 275 curpcb = &lwp0.l_addr->u_pcb; 276 curpcb->pcb_flags = 0; 277 curpcb->pcb_un.un_32.pcb32_und_sp = (u_int)lwp0.l_addr + 278 USPACE_UNDEF_STACK_TOP; 279 curpcb->pcb_un.un_32.pcb32_sp = (u_int)lwp0.l_addr + 280 USPACE_SVC_STACK_TOP; 281 282 curpcb->pcb_tf = (struct trapframe *)curpcb->pcb_un.un_32.pcb32_sp - 1; 283 } 284 285 /* 286 * machine dependent system variables. 287 */ 288 static int 289 sysctl_machdep_booted_device(SYSCTLFN_ARGS) 290 { 291 struct sysctlnode node; 292 293 if (booted_device == NULL) 294 return (EOPNOTSUPP); 295 296 node = *rnode; 297 node.sysctl_data = booted_device->dv_xname; 298 node.sysctl_size = strlen(booted_device->dv_xname) + 1; 299 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 300 } 301 302 static int 303 sysctl_machdep_booted_kernel(SYSCTLFN_ARGS) 304 { 305 struct sysctlnode node; 306 307 if (booted_kernel == NULL || booted_kernel[0] == '\0') 308 return (EOPNOTSUPP); 309 310 node = *rnode; 311 node.sysctl_data = booted_kernel; 312 node.sysctl_size = strlen(booted_kernel) + 1; 313 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 314 } 315 316 static int 317 sysctl_machdep_powersave(SYSCTLFN_ARGS) 318 { 319 struct sysctlnode node = *rnode; 320 int error, newval; 321 322 newval = cpu_do_powersave; 323 node.sysctl_data = &newval; 324 if (cpufuncs.cf_sleep == (void *) cpufunc_nullop) 325 node.sysctl_flags &= ~CTLFLAG_READWRITE; 326 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 327 if (error || newp == NULL || newval == cpu_do_powersave) 328 return (error); 329 330 if (newval < 0 || newval > 1) 331 return (EINVAL); 332 cpu_do_powersave = newval; 333 334 return (0); 335 } 336 337 SYSCTL_SETUP(sysctl_machdep_setup, "sysctl machdep subtree setup") 338 { 339 340 sysctl_createv(clog, 0, NULL, NULL, 341 CTLFLAG_PERMANENT, 342 CTLTYPE_NODE, "machdep", NULL, 343 NULL, 0, NULL, 0, 344 CTL_MACHDEP, CTL_EOL); 345 346 sysctl_createv(clog, 0, NULL, NULL, 347 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 348 CTLTYPE_INT, "debug", NULL, 349 NULL, 0, &kernel_debug, 0, 350 CTL_MACHDEP, CPU_DEBUG, CTL_EOL); 351 sysctl_createv(clog, 0, NULL, NULL, 352 CTLFLAG_PERMANENT, 353 CTLTYPE_STRING, "booted_device", NULL, 354 sysctl_machdep_booted_device, 0, NULL, 0, 355 CTL_MACHDEP, CPU_BOOTED_DEVICE, CTL_EOL); 356 sysctl_createv(clog, 0, NULL, NULL, 357 CTLFLAG_PERMANENT, 358 CTLTYPE_STRING, "booted_kernel", NULL, 359 sysctl_machdep_booted_kernel, 0, NULL, 0, 360 CTL_MACHDEP, CPU_BOOTED_KERNEL, CTL_EOL); 361 sysctl_createv(clog, 0, NULL, NULL, 362 CTLFLAG_PERMANENT, 363 CTLTYPE_STRUCT, "console_device", NULL, 364 sysctl_consdev, 0, NULL, sizeof(dev_t), 365 CTL_MACHDEP, CPU_CONSDEV, CTL_EOL); 366 sysctl_createv(clog, 0, NULL, NULL, 367 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 368 CTLTYPE_INT, "powersave", NULL, 369 sysctl_machdep_powersave, 0, &cpu_do_powersave, 0, 370 CTL_MACHDEP, CPU_POWERSAVE, CTL_EOL); 371 } 372 373 void 374 parse_mi_bootargs(args) 375 char *args; 376 { 377 int integer; 378 379 if (get_bootconf_option(args, "single", BOOTOPT_TYPE_BOOLEAN, &integer) 380 || get_bootconf_option(args, "-s", BOOTOPT_TYPE_BOOLEAN, &integer)) 381 if (integer) 382 boothowto |= RB_SINGLE; 383 if (get_bootconf_option(args, "kdb", BOOTOPT_TYPE_BOOLEAN, &integer) 384 || get_bootconf_option(args, "-k", BOOTOPT_TYPE_BOOLEAN, &integer)) 385 if (integer) 386 boothowto |= RB_KDB; 387 if (get_bootconf_option(args, "ask", BOOTOPT_TYPE_BOOLEAN, &integer) 388 || get_bootconf_option(args, "-a", BOOTOPT_TYPE_BOOLEAN, &integer)) 389 if (integer) 390 boothowto |= RB_ASKNAME; 391 392 #ifdef PMAP_DEBUG 393 if (get_bootconf_option(args, "pmapdebug", BOOTOPT_TYPE_INT, &integer)) { 394 pmap_debug_level = integer; 395 pmap_debug(pmap_debug_level); 396 } 397 #endif /* PMAP_DEBUG */ 398 399 /* if (get_bootconf_option(args, "nbuf", BOOTOPT_TYPE_INT, &integer)) 400 bufpages = integer;*/ 401 402 #if NMD > 0 && defined(MEMORY_DISK_HOOKS) && !defined(MEMORY_DISK_ROOT_SIZE) 403 if (get_bootconf_option(args, "memorydisc", BOOTOPT_TYPE_INT, &integer) 404 || get_bootconf_option(args, "memorydisk", BOOTOPT_TYPE_INT, &integer)) { 405 md_root_size = integer; 406 md_root_size *= 1024; 407 if (md_root_size < 32*1024) 408 md_root_size = 32*1024; 409 if (md_root_size > 2048*1024) 410 md_root_size = 2048*1024; 411 } 412 #endif /* NMD && MEMORY_DISK_HOOKS && !MEMORY_DISK_ROOT_SIZE */ 413 414 if (get_bootconf_option(args, "quiet", BOOTOPT_TYPE_BOOLEAN, &integer) 415 || get_bootconf_option(args, "-q", BOOTOPT_TYPE_BOOLEAN, &integer)) 416 if (integer) 417 boothowto |= AB_QUIET; 418 if (get_bootconf_option(args, "verbose", BOOTOPT_TYPE_BOOLEAN, &integer) 419 || get_bootconf_option(args, "-v", BOOTOPT_TYPE_BOOLEAN, &integer)) 420 if (integer) 421 boothowto |= AB_VERBOSE; 422 } 423 424 void 425 cpu_need_resched(struct cpu_info *ci, int flags) 426 { 427 bool immed = (flags & RESCHED_IMMED) != 0; 428 429 if (ci->ci_want_resched && !immed) 430 return; 431 432 ci->ci_want_resched = 1; 433 if (curlwp != ci->ci_data.cpu_idlelwp) 434 setsoftast(); 435 } 436