1 /* 2 * Copyright (c) 2004 Christian Limpach. 3 * Copyright (c) 2004-2006,2008 Kip Macy 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * Copyright (c) 2013 Roger Pau Monné <roger.pau@citrix.com> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include "opt_ddb.h" 34 #include "opt_kstack_pages.h" 35 36 #include <sys/param.h> 37 #include <sys/bus.h> 38 #include <sys/kernel.h> 39 #include <sys/reboot.h> 40 #include <sys/systm.h> 41 #include <sys/malloc.h> 42 #include <sys/linker.h> 43 #include <sys/lock.h> 44 #include <sys/rwlock.h> 45 #include <sys/boot.h> 46 #include <sys/ctype.h> 47 #include <sys/mutex.h> 48 #include <sys/smp.h> 49 50 #include <vm/vm.h> 51 #include <vm/vm_extern.h> 52 #include <vm/vm_kern.h> 53 #include <vm/vm_page.h> 54 #include <vm/vm_map.h> 55 #include <vm/vm_object.h> 56 #include <vm/vm_pager.h> 57 #include <vm/vm_param.h> 58 59 #include <machine/intr_machdep.h> 60 #include <x86/apicvar.h> 61 #include <x86/init.h> 62 #include <machine/pc/bios.h> 63 #include <machine/smp.h> 64 #include <machine/intr_machdep.h> 65 #include <machine/metadata.h> 66 67 #include <xen/xen-os.h> 68 #include <xen/hypervisor.h> 69 #include <xen/xenstore/xenstorevar.h> 70 #include <xen/xen_pv.h> 71 #include <xen/xen_msi.h> 72 73 #include <xen/interface/vcpu.h> 74 75 #include <dev/xen/timer/timer.h> 76 77 #ifdef DDB 78 #include <ddb/ddb.h> 79 #endif 80 81 /* Native initial function */ 82 extern u_int64_t hammer_time(u_int64_t, u_int64_t); 83 /* Xen initial function */ 84 uint64_t hammer_time_xen(start_info_t *, uint64_t); 85 86 #define MAX_E820_ENTRIES 128 87 88 /*--------------------------- Forward Declarations ---------------------------*/ 89 static caddr_t xen_pv_parse_preload_data(u_int64_t); 90 static void xen_pv_parse_memmap(caddr_t, vm_paddr_t *, int *); 91 92 #ifdef SMP 93 static int xen_pv_start_all_aps(void); 94 #endif 95 96 /*---------------------------- Extern Declarations ---------------------------*/ 97 #ifdef SMP 98 /* Variables used by amd64 mp_machdep to start APs */ 99 extern char *doublefault_stack; 100 extern char *nmi_stack; 101 #endif 102 103 /* 104 * Placed by the linker at the end of the bss section, which is the last 105 * section loaded by Xen before loading the symtab and strtab. 106 */ 107 extern uint32_t end; 108 109 /*-------------------------------- Global Data -------------------------------*/ 110 /* Xen init_ops implementation. */ 111 struct init_ops xen_init_ops = { 112 .parse_preload_data = xen_pv_parse_preload_data, 113 .early_clock_source_init = xen_clock_init, 114 .early_delay = xen_delay, 115 .parse_memmap = xen_pv_parse_memmap, 116 #ifdef SMP 117 .start_all_aps = xen_pv_start_all_aps, 118 #endif 119 .msi_init = xen_msi_init, 120 }; 121 122 static struct bios_smap xen_smap[MAX_E820_ENTRIES]; 123 124 /*-------------------------------- Xen PV init -------------------------------*/ 125 /* 126 * First function called by the Xen PVH boot sequence. 127 * 128 * Set some Xen global variables and prepare the environment so it is 129 * as similar as possible to what native FreeBSD init function expects. 130 */ 131 uint64_t 132 hammer_time_xen(start_info_t *si, uint64_t xenstack) 133 { 134 uint64_t physfree; 135 uint64_t *PT4 = (u_int64_t *)xenstack; 136 uint64_t *PT3 = (u_int64_t *)(xenstack + PAGE_SIZE); 137 uint64_t *PT2 = (u_int64_t *)(xenstack + 2 * PAGE_SIZE); 138 int i; 139 140 xen_domain_type = XEN_PV_DOMAIN; 141 vm_guest = VM_GUEST_XEN; 142 143 if ((si == NULL) || (xenstack == 0)) { 144 xc_printf("ERROR: invalid start_info or xen stack, halting\n"); 145 HYPERVISOR_shutdown(SHUTDOWN_crash); 146 } 147 148 xc_printf("FreeBSD PVH running on %s\n", si->magic); 149 150 /* We use 3 pages of xen stack for the boot pagetables */ 151 physfree = xenstack + 3 * PAGE_SIZE - KERNBASE; 152 153 /* Setup Xen global variables */ 154 HYPERVISOR_start_info = si; 155 HYPERVISOR_shared_info = 156 (shared_info_t *)(si->shared_info + KERNBASE); 157 158 /* 159 * Setup some misc global variables for Xen devices 160 * 161 * XXX: Devices that need these specific variables should 162 * be rewritten to fetch this info by themselves from the 163 * start_info page. 164 */ 165 xen_store = (struct xenstore_domain_interface *) 166 (ptoa(si->store_mfn) + KERNBASE); 167 console_page = (char *)(ptoa(si->console.domU.mfn) + KERNBASE); 168 169 /* 170 * Use the stack Xen gives us to build the page tables 171 * as native FreeBSD expects to find them (created 172 * by the boot trampoline). 173 */ 174 for (i = 0; i < (PAGE_SIZE / sizeof(uint64_t)); i++) { 175 /* 176 * Each slot of the level 4 pages points 177 * to the same level 3 page 178 */ 179 PT4[i] = ((uint64_t)&PT3[0]) - KERNBASE; 180 PT4[i] |= PG_V | PG_RW | PG_U; 181 182 /* 183 * Each slot of the level 3 pages points 184 * to the same level 2 page 185 */ 186 PT3[i] = ((uint64_t)&PT2[0]) - KERNBASE; 187 PT3[i] |= PG_V | PG_RW | PG_U; 188 189 /* 190 * The level 2 page slots are mapped with 191 * 2MB pages for 1GB. 192 */ 193 PT2[i] = i * (2 * 1024 * 1024); 194 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U; 195 } 196 load_cr3(((uint64_t)&PT4[0]) - KERNBASE); 197 198 /* Set the hooks for early functions that diverge from bare metal */ 199 init_ops = xen_init_ops; 200 apic_ops = xen_apic_ops; 201 202 /* Now we can jump into the native init function */ 203 return (hammer_time(0, physfree)); 204 } 205 206 /*-------------------------------- PV specific -------------------------------*/ 207 #ifdef SMP 208 static bool 209 start_xen_ap(int cpu) 210 { 211 struct vcpu_guest_context *ctxt; 212 int ms, cpus = mp_naps; 213 const size_t stacksize = kstack_pages * PAGE_SIZE; 214 215 /* allocate and set up an idle stack data page */ 216 bootstacks[cpu] = 217 (void *)kmem_malloc(kernel_arena, stacksize, M_WAITOK | M_ZERO); 218 doublefault_stack = 219 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO); 220 nmi_stack = 221 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO); 222 dpcpu = 223 (void *)kmem_malloc(kernel_arena, DPCPU_SIZE, M_WAITOK | M_ZERO); 224 225 bootSTK = (char *)bootstacks[cpu] + kstack_pages * PAGE_SIZE - 8; 226 bootAP = cpu; 227 228 ctxt = malloc(sizeof(*ctxt), M_TEMP, M_WAITOK | M_ZERO); 229 if (ctxt == NULL) 230 panic("unable to allocate memory"); 231 232 ctxt->flags = VGCF_IN_KERNEL; 233 ctxt->user_regs.rip = (unsigned long) init_secondary; 234 ctxt->user_regs.rsp = (unsigned long) bootSTK; 235 236 /* Set the AP to use the same page tables */ 237 ctxt->ctrlreg[3] = KPML4phys; 238 239 if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt)) 240 panic("unable to initialize AP#%d", cpu); 241 242 free(ctxt, M_TEMP); 243 244 /* Launch the vCPU */ 245 if (HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL)) 246 panic("unable to start AP#%d", cpu); 247 248 /* Wait up to 5 seconds for it to start. */ 249 for (ms = 0; ms < 5000; ms++) { 250 if (mp_naps > cpus) 251 return (true); 252 DELAY(1000); 253 } 254 255 return (false); 256 } 257 258 static int 259 xen_pv_start_all_aps(void) 260 { 261 int cpu; 262 263 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN); 264 265 for (cpu = 1; cpu < mp_ncpus; cpu++) { 266 267 /* attempt to start the Application Processor */ 268 if (!start_xen_ap(cpu)) 269 panic("AP #%d failed to start!", cpu); 270 271 CPU_SET(cpu, &all_cpus); /* record AP in CPU map */ 272 } 273 274 return (mp_naps); 275 } 276 #endif /* SMP */ 277 278 /* 279 * Functions to convert the "extra" parameters passed by Xen 280 * into FreeBSD boot options. 281 */ 282 static void 283 xen_pv_set_env(void) 284 { 285 char *cmd_line_next, *cmd_line; 286 size_t env_size; 287 288 cmd_line = HYPERVISOR_start_info->cmd_line; 289 env_size = sizeof(HYPERVISOR_start_info->cmd_line); 290 291 /* Skip leading spaces */ 292 for (; isspace(*cmd_line) && (env_size != 0); cmd_line++) 293 env_size--; 294 295 /* Replace ',' with '\0' */ 296 for (cmd_line_next = cmd_line; strsep(&cmd_line_next, ",") != NULL;) 297 ; 298 299 init_static_kenv(cmd_line, 0); 300 } 301 302 static void 303 xen_pv_set_boothowto(void) 304 { 305 int i; 306 char *env; 307 308 /* get equivalents from the environment */ 309 for (i = 0; howto_names[i].ev != NULL; i++) { 310 if ((env = kern_getenv(howto_names[i].ev)) != NULL) { 311 boothowto |= howto_names[i].mask; 312 freeenv(env); 313 } 314 } 315 } 316 317 #ifdef DDB 318 /* 319 * The way Xen loads the symtab is different from the native boot loader, 320 * because it's tailored for NetBSD. So we have to adapt and use the same 321 * method as NetBSD. Portions of the code below have been picked from NetBSD: 322 * sys/kern/kern_ksyms.c CVS Revision 1.71. 323 */ 324 static void 325 xen_pv_parse_symtab(void) 326 { 327 Elf_Ehdr *ehdr; 328 Elf_Shdr *shdr; 329 vm_offset_t sym_end; 330 uint32_t size; 331 int i, j; 332 333 size = end; 334 sym_end = HYPERVISOR_start_info->mod_start != 0 ? 335 HYPERVISOR_start_info->mod_start : 336 HYPERVISOR_start_info->mfn_list; 337 338 /* 339 * Make sure the size is right headed, sym_end is just a 340 * high boundary, but at least allows us to fail earlier. 341 */ 342 if ((vm_offset_t)&end + size > sym_end) { 343 xc_printf("Unable to load ELF symtab: size mismatch\n"); 344 return; 345 } 346 347 ehdr = (Elf_Ehdr *)(&end + 1); 348 if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) || 349 ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 350 ehdr->e_version > 1) { 351 xc_printf("Unable to load ELF symtab: invalid symbol table\n"); 352 return; 353 } 354 355 shdr = (Elf_Shdr *)((uint8_t *)ehdr + ehdr->e_shoff); 356 /* Find the symbol table and the corresponding string table. */ 357 for (i = 1; i < ehdr->e_shnum; i++) { 358 if (shdr[i].sh_type != SHT_SYMTAB) 359 continue; 360 if (shdr[i].sh_offset == 0) 361 continue; 362 ksymtab = (uintptr_t)((uint8_t *)ehdr + shdr[i].sh_offset); 363 ksymtab_size = shdr[i].sh_size; 364 j = shdr[i].sh_link; 365 if (shdr[j].sh_offset == 0) 366 continue; /* Can this happen? */ 367 kstrtab = (uintptr_t)((uint8_t *)ehdr + shdr[j].sh_offset); 368 break; 369 } 370 371 if (ksymtab == 0 || kstrtab == 0) { 372 xc_printf( 373 "Unable to load ELF symtab: could not find symtab or strtab\n"); 374 return; 375 } 376 } 377 #endif 378 379 static caddr_t 380 xen_pv_parse_preload_data(u_int64_t modulep) 381 { 382 caddr_t kmdp; 383 vm_ooffset_t off; 384 vm_paddr_t metadata; 385 char *envp; 386 387 if (HYPERVISOR_start_info->mod_start != 0) { 388 preload_metadata = (caddr_t)(HYPERVISOR_start_info->mod_start); 389 390 kmdp = preload_search_by_type("elf kernel"); 391 if (kmdp == NULL) 392 kmdp = preload_search_by_type("elf64 kernel"); 393 KASSERT(kmdp != NULL, ("unable to find kernel")); 394 395 /* 396 * Xen has relocated the metadata and the modules, 397 * so we need to recalculate it's position. This is 398 * done by saving the original modulep address and 399 * then calculating the offset with mod_start, 400 * which contains the relocated modulep address. 401 */ 402 metadata = MD_FETCH(kmdp, MODINFOMD_MODULEP, vm_paddr_t); 403 off = HYPERVISOR_start_info->mod_start - metadata; 404 405 preload_bootstrap_relocate(off); 406 407 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 408 envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *); 409 if (envp != NULL) 410 envp += off; 411 init_static_kenv(envp, 0); 412 } else { 413 /* Parse the extra boot information given by Xen */ 414 xen_pv_set_env(); 415 xen_pv_set_boothowto(); 416 kmdp = NULL; 417 } 418 419 #ifdef DDB 420 xen_pv_parse_symtab(); 421 #endif 422 return (kmdp); 423 } 424 425 static void 426 xen_pv_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx) 427 { 428 struct xen_memory_map memmap; 429 u_int32_t size; 430 int rc; 431 432 /* Fetch the E820 map from Xen */ 433 memmap.nr_entries = MAX_E820_ENTRIES; 434 set_xen_guest_handle(memmap.buffer, xen_smap); 435 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap); 436 if (rc) 437 panic("unable to fetch Xen E820 memory map"); 438 size = memmap.nr_entries * sizeof(xen_smap[0]); 439 440 bios_add_smap_entries(xen_smap, size, physmap, physmap_idx); 441 } 442