usr/src/psm/stand/boot/sparc/common/ramdisk.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <sys/param.h>
  27 #include <sys/promif.h>
  28 #include <sys/salib.h>
  29 #include "ramdisk.h"
  30
  31 #include <sys/param.h>
  32 #include <sys/fcntl.h>
  33 #include <sys/obpdefs.h>
  34 #include <sys/reboot.h>
  35 #include <sys/promif.h>
  36 #include <sys/stat.h>
  37 #include <sys/bootvfs.h>
  38 #include <sys/platnames.h>
  39 #include <sys/salib.h>
  40 #include <sys/elf.h>
  41 #include <sys/link.h>
  42 #include <sys/auxv.h>
  43 #include <sys/boot_policy.h>
  44 #include <sys/boot_redirect.h>
  45 #include <sys/bootconf.h>
  46 #include <sys/boot.h>
  47 #include "boot_plat.h"
  48
  49
  50 static char ramdisk_preamble_fth[] =
  51
  52 ": find-abort ( name$ -- ) "
  53 "   .\" Can't find \" type abort "
  54 "; "
  55
  56 ": get-package ( pkg$ -- ph ) "
  57 "   2dup  find-package 0=  if "
  58 "      find-abort "
  59 "   then                       ( pkg$ ph ) "
  60 "   nip nip                    ( ph ) "
  61 "; "
  62
  63 "\" /openprom/client-services\" get-package  constant cif-ph "
  64
  65 "instance defer cif-open     ( dev$ -- ihandle|0 ) "
  66 "instance defer cif-close    ( ihandle -- ) "
  67
  68 ": find-cif-method ( adr,len -- acf ) "
  69 "   2dup  cif-ph find-method 0=  if    ( adr,len ) "
  70 "      find-abort "
  71 "   then                               ( adr,len acf ) "
  72 "   nip nip                            ( acf ) "
  73 "; "
  74
  75 "\" open\"     find-cif-method to cif-open "
  76 "\" close\"    find-cif-method to cif-close "
  77
  78 "0 value dev-ih "
  79
  80 "d# 100 buffer: open-cstr "
  81
  82 ": dev-open ( dev$ -- okay? ) "
  83 /* copy to C string for open  */
  84 "   0  over open-cstr +  c! "
  85 "   open-cstr swap  move "
  86 "   open-cstr  cif-open dup  if "
  87 "      dup to dev-ih "
  88 "   then "
  89 "; "
  90
  91 ": dev-close ( -- ) "
  92 "   dev-ih cif-close "
  93 "   0 to dev-ih "
  94 "; "
  95
  96 ": open-abort  ( file$ -- ) "
  97 "   .\" Can't open \"  type  abort "
  98 "; "
  99 ;
 100
 101 static char ramdisk_fth[] =
 102
 103 "\" /\" get-package  push-package "
 104
 105 "new-device "
 106 "   \" %s\" device-name "
 107 "    "
 108 "   \" block\"          device-type "
 109 "   \" SUNW,ramdisk\"   encode-string \" compatible\"  property"
 110
 111 "   0 instance value current-offset "
 112 "    "
 113 "   0 value ramdisk-base-va "
 114 "   0 value ramdisk-size "
 115 "   0 value alloc-size "
 116 "    "
 117 "   : set-props "
 118 "      ramdisk-size     encode-int  \" size\"        property "
 119 "      ramdisk-base-va  encode-int  \" address\"     property "
 120 "      alloc-size       encode-int  \" alloc-size\"  property "
 121 "   ; "
 122 "   set-props "
 123 "    "
 124 "   : current-va  ( -- adr )  ramdisk-base-va current-offset +  ; "
 125 "    "
 126 "   external "
 127 "    "
 128 "   : open  ( -- okay? ) "
 129 /* " .\" ramdisk-open\" cr " */
 130 "      true "
 131 "   ; "
 132 "    "
 133 "   : close  ( -- ) "
 134 "   ; "
 135 "    "
 136 "   : seek  ( off.low off.high -- error? ) "
 137 /* " 2dup .\" ramdisk-seek: \" .x .x " */
 138 "      drop  dup  ramdisk-size  >  if "
 139 /* " .\" fail\" cr " */
 140 "         drop true  exit         ( failed ) "
 141 "      then "
 142 "      to current-offset  false   ( succeeded ) "
 143 /* " .\" OK\" cr " */
 144 "   ; "
 145 "    "
 146 "   : read  ( addr len -- actual-len ) "
 147 /* " 2dup .\" ramdisk-read: \" .x .x " */
 148 "      dup  current-offset  +            ( addr len new-off ) "
 149 "      dup  ramdisk-size  >  if "
 150 "         ramdisk-size -  -              ( addr len' ) "
 151 "         ramdisk-size                   ( addr len new-off ) "
 152 "      then  -rot                        ( new-off addr len ) "
 153 "      tuck  current-va  -rot  move      ( new-off len ) "
 154 "      swap  to current-offset           ( len ) "
 155 /* " dup .x cr " */
 156 "   ; "
 157 "    "
 158 "   : create ( alloc-sz base size -- ) "
 159 "      to ramdisk-size "
 160 "      to ramdisk-base-va "
 161 "      to alloc-size "
 162 "      set-props "
 163 "   ; "
 164 "    "
 165 "finish-device "
 166 "pop-package "
 167
 168 "\" /%s\" 2dup  dev-open  0=  if "
 169 "   open-abort "
 170 "then 2drop "
 171
 172 /* %x %x %x will be replaced by alloc-sz, base, size respectively */
 173 "h# %x h# %x h# %x ( alloc-sz base size ) "
 174 "\" create\" dev-ih  $call-method  (  ) "
 175 "dev-close "
 176
 177 ;
 178
 179 char ramdisk_bootable[] =
 180
 181 "\" /chosen\" get-package  push-package "
 182 "   \" nfs\"             encode-string  \" fstype\"  property "
 183 "   \" /%s\"             encode-string  \" bootarchive\"  property "
 184 "pop-package "
 185
 186 "   h# %x d# 512 +  to load-base init-program "
 187 ;
 188
 189 #define BOOT_ARCHIVE_ALLOC_SIZE (32 * 1024 * 1024)      /* 32 MB */
 190 #define BOOTFS_VIRT             ((caddr_t)0x50f00000)
 191 #define ROOTFS_VIRT             ((caddr_t)0x52000000)
 192
 193 struct ramdisk_attr {
 194         char *rd_name;
 195         caddr_t rd_base;
 196         size_t rd_size;
 197 } ramdisk_attr[] = {
 198         RD_BOOTFS,      BOOTFS_VIRT,    0,
 199         RD_ROOTFS,      ROOTFS_VIRT,    0,
 200         0
 201 };
 202
 203 static struct ramdisk_attr *
 204 ramdisk_lookup(char *ramdisk_name)
 205 {
 206         int i;
 207
 208         for (i = 0; ramdisk_attr[i].rd_name != 0; i++) {
 209                 if (strcmp(ramdisk_name, ramdisk_attr[i].rd_name) == 0) {
 210                         return (&ramdisk_attr[i]);
 211                 }
 212         }
 213         return (NULL);
 214 }
 215
 216 static void
 217 ramdisk_free_mem(caddr_t addr, size_t size)
 218 {
 219         caddr_t end_addr;
 220
 221         for (end_addr = addr + size; addr < end_addr;
 222             addr += BOOT_ARCHIVE_ALLOC_SIZE) {
 223                 prom_free(addr, MIN(BOOT_ARCHIVE_ALLOC_SIZE, end_addr - addr));
 224         }
 225 }
 226
 227 /*
 228  * Allocate memory for ramdisk image.
 229  */
 230 static caddr_t
 231 ramdisk_alloc_mem(caddr_t addr, size_t size)
 232 {
 233         caddr_t virt = addr;
 234         caddr_t end_addr;
 235
 236         for (end_addr = virt + size; virt < end_addr;
 237             virt += BOOT_ARCHIVE_ALLOC_SIZE) {
 238                 if (prom_alloc(virt,
 239                     MIN(BOOT_ARCHIVE_ALLOC_SIZE, end_addr - virt),
 240                     1) == NULL) {
 241                         ramdisk_free_mem(addr, virt - addr);
 242                         return (NULL);
 243                 }
 244         }
 245         return (addr);
 246 }
 247
 248 caddr_t
 249 create_ramdisk(char *ramdisk_name, size_t size, char **devpath)
 250 {
 251         char    *fth_buf;
 252         size_t  buf_size;
 253         struct ramdisk_attr *rdp;
 254         char tdevpath[80];
 255         caddr_t virt;
 256         static int need_preamble = 1;
 257
 258         /*
 259          * lookup ramdisk name.
 260          */
 261         if ((rdp = ramdisk_lookup(ramdisk_name)) == NULL)
 262                 prom_panic("invalid ramdisk name");
 263
 264         virt = rdp->rd_base;
 265
 266         /*
 267          * Allocate memory.
 268          */
 269         size = roundup(size, PAGESIZE);
 270         if (ramdisk_alloc_mem(virt, size) == NULL)
 271                 prom_panic("can't alloc ramdisk memory");
 272
 273         rdp->rd_size = size;
 274
 275         if (need_preamble) {
 276                 prom_interpret(ramdisk_preamble_fth, 0, 0, 0, 0, 0);
 277                 need_preamble = 0;
 278         }
 279
 280         /*
 281          * add some space to the size to accommodate a few words in the
 282          * snprintf() below.
 283          */
 284         buf_size = sizeof (ramdisk_fth) + 80;
 285
 286         fth_buf = bkmem_alloc(buf_size);
 287         if (fth_buf == NULL)
 288                 prom_panic("unable to allocate Forth buffer for ramdisk");
 289
 290         (void) snprintf(fth_buf, buf_size, ramdisk_fth,
 291             ramdisk_name, ramdisk_name,
 292             BOOT_ARCHIVE_ALLOC_SIZE, virt, size);
 293
 294         prom_interpret(fth_buf, 0, 0, 0, 0, 0);
 295         bkmem_free(fth_buf, buf_size);
 296
 297         if (devpath != NULL) {
 298                 (void) snprintf(tdevpath, sizeof (tdevpath), "/%s:nolabel",
 299                     ramdisk_name);
 300                 *devpath = strdup(tdevpath);
 301         }
 302
 303         return (virt);
 304 }
 305
 306 void
 307 destroy_ramdisk(char *ramdisk_name)
 308 {
 309         struct ramdisk_attr *rdp;
 310
 311         /*
 312          * lookup ramdisk name.
 313          */
 314         if ((rdp = ramdisk_lookup(ramdisk_name)) == NULL)
 315                 prom_panic("invalid ramdisk name");
 316
 317         ramdisk_free_mem(rdp->rd_base, rdp->rd_size);
 318         rdp->rd_size = 0;
 319 }
 320
 321 /*
 322  * change cwp! to drop in the 2nd word of (init-program) - really
 323  * init-c-stack, but that word has no header.
 324  * (you are not expected to undertsnad this)
 325  */
 326 char obpfix[] = "' drop ' cwp!  ' (init-program) >body ta1+ token@ (patch";
 327 char obpver[OBP_MAXPROPNAME];
 328 const char badver[] = "OBP 4.27.";
 329
 330
 331 void
 332 boot_ramdisk(char *ramdisk_name)
 333 {
 334         char    *fth_buf;
 335         size_t  buf_size;
 336         struct ramdisk_attr *rdp;
 337         void do_sg_go(void);
 338
 339         /*
 340          * OBP revs 4.27.0 to 4.27.8 started using
 341          * windowed regs for the forth kernel, but
 342          * init-program still blindly 0'd %cwp, which
 343          * causes predictably disaterous consequences
 344          * when called with %cwp != 0.
 345          *
 346          * We detect and fix this here
 347          */
 348         if (prom_version_name(obpver, OBP_MAXPROPNAME) != -1 &&
 349             strncmp(obpver, badver, sizeof (badver) - 1) == 0) {
 350                 char ch = obpver[sizeof (badver) - 1];
 351
 352                 if (ch >= '0' && ch <= '8') {
 353                         prom_interpret(obpfix, 0, 0, 0, 0, 0);
 354                 }
 355         }
 356
 357         /* close all open devices */
 358         closeall(1);
 359
 360         /*
 361          * lookup ramdisk name.
 362          */
 363         if ((rdp = ramdisk_lookup(ramdisk_name)) == NULL)
 364                 prom_panic("invalid ramdisk name");
 365
 366         /*
 367          * add some space to the size to accommodate a few words in the
 368          * snprintf() below.
 369          */
 370         buf_size = sizeof (ramdisk_bootable) + 80;
 371
 372         fth_buf = bkmem_alloc(buf_size);
 373         if (fth_buf == NULL)
 374                 prom_panic("unable to allocate Forth buffer for ramdisk");
 375
 376         (void) snprintf(fth_buf, buf_size, ramdisk_bootable,
 377             ramdisk_name, rdp->rd_base);
 378
 379         prom_interpret(fth_buf, 0, 0, 0, 0, 0);
 380
 381         /*
 382          * Ugh  Serengeti proms don't execute C programs
 383          * in init-program, and 'go' doesn't work when
 384          * launching a second C program (inetboot itself
 385          * was launched as the 1st C program).  Nested fcode
 386          * programs work, but that doesn't help the kernel.
 387          */
 388         do_sg_go();
 389 }
 390
 391 void
 392 do_sg_go()
 393 {
 394         pnode_t chosen = prom_chosennode();
 395         Elf64_Ehdr *ehdr;
 396         Elf64_Addr entry;
 397         uint32_t eadr;
 398         extern int is_sg;
 399         extern caddr_t sg_addr;
 400         extern size_t sg_len;
 401
 402         if (!is_sg)
 403                 prom_panic("do_sg_go");
 404
 405         /*
 406          * The ramdisk bootblk left a pointer to the elf image
 407          * in 'elfheader-address'  Use it to find the kernel's
 408          * entry point.
 409          */
 410         if (prom_getprop(chosen, "elfheader-address", (caddr_t)&eadr) == -1)
 411                 prom_panic("no elf header property");
 412         ehdr = (Elf64_Ehdr *)(uintptr_t)eadr;
 413         if (ehdr->e_machine != EM_SPARCV9)
 414                 prom_panic("bad ELF header");
 415         entry = ehdr->e_entry;
 416
 417         /*
 418          * free extra bootmem
 419          */
 420         prom_free(sg_addr, sg_len);
 421
 422         /*
 423          * Use pre-newboot's exitto64() to launch the kernel
 424          */
 425         exitto64((int (*)())entry, NULL);
 426         prom_panic("exitto returned");
 427 }