1 /* 2 * Copyright (c) 2004 Christian Limpach. 3 * Copyright (c) 2004-2006,2008 Kip Macy 4 * Copyright (c) 2013 Roger Pau Monné <roger.pau@citrix.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/kernel.h> 35 #include <sys/reboot.h> 36 #include <sys/systm.h> 37 #include <sys/malloc.h> 38 #include <sys/lock.h> 39 #include <sys/rwlock.h> 40 #include <sys/boot.h> 41 #include <sys/ctype.h> 42 #include <sys/mutex.h> 43 #include <sys/smp.h> 44 45 #include <vm/vm.h> 46 #include <vm/vm_extern.h> 47 #include <vm/vm_kern.h> 48 #include <vm/vm_page.h> 49 #include <vm/vm_map.h> 50 #include <vm/vm_object.h> 51 #include <vm/vm_pager.h> 52 #include <vm/vm_param.h> 53 54 #include <machine/intr_machdep.h> 55 #include <x86/apicvar.h> 56 #include <x86/init.h> 57 #include <machine/pc/bios.h> 58 #include <machine/smp.h> 59 60 #include <xen/xen-os.h> 61 #include <xen/hypervisor.h> 62 #include <xen/xenstore/xenstorevar.h> 63 #include <xen/xen_pv.h> 64 65 #include <xen/interface/vcpu.h> 66 67 #include <dev/xen/timer/timer.h> 68 69 /* Native initial function */ 70 extern u_int64_t hammer_time(u_int64_t, u_int64_t); 71 /* Xen initial function */ 72 uint64_t hammer_time_xen(start_info_t *, uint64_t); 73 74 #define MAX_E820_ENTRIES 128 75 76 /*--------------------------- Forward Declarations ---------------------------*/ 77 static caddr_t xen_pv_parse_preload_data(u_int64_t); 78 static void xen_pv_parse_memmap(caddr_t, vm_paddr_t *, int *); 79 80 #ifdef SMP 81 static int xen_pv_start_all_aps(void); 82 #endif 83 84 /*---------------------------- Extern Declarations ---------------------------*/ 85 #ifdef SMP 86 /* Variables used by amd64 mp_machdep to start APs */ 87 extern struct mtx ap_boot_mtx; 88 extern void *bootstacks[]; 89 extern char *doublefault_stack; 90 extern char *nmi_stack; 91 extern void *dpcpu; 92 extern int bootAP; 93 extern char *bootSTK; 94 #endif 95 96 /*-------------------------------- Global Data -------------------------------*/ 97 /* Xen init_ops implementation. */ 98 struct init_ops xen_init_ops = { 99 .parse_preload_data = xen_pv_parse_preload_data, 100 .early_clock_source_init = xen_clock_init, 101 .early_delay = xen_delay, 102 .parse_memmap = xen_pv_parse_memmap, 103 #ifdef SMP 104 .start_all_aps = xen_pv_start_all_aps, 105 #endif 106 }; 107 108 static struct bios_smap xen_smap[MAX_E820_ENTRIES]; 109 110 /*-------------------------------- Xen PV init -------------------------------*/ 111 /* 112 * First function called by the Xen PVH boot sequence. 113 * 114 * Set some Xen global variables and prepare the environment so it is 115 * as similar as possible to what native FreeBSD init function expects. 116 */ 117 uint64_t 118 hammer_time_xen(start_info_t *si, uint64_t xenstack) 119 { 120 uint64_t physfree; 121 uint64_t *PT4 = (u_int64_t *)xenstack; 122 uint64_t *PT3 = (u_int64_t *)(xenstack + PAGE_SIZE); 123 uint64_t *PT2 = (u_int64_t *)(xenstack + 2 * PAGE_SIZE); 124 int i; 125 126 xen_domain_type = XEN_PV_DOMAIN; 127 vm_guest = VM_GUEST_XEN; 128 129 if ((si == NULL) || (xenstack == 0)) { 130 xc_printf("ERROR: invalid start_info or xen stack, halting\n"); 131 HYPERVISOR_shutdown(SHUTDOWN_crash); 132 } 133 134 xc_printf("FreeBSD PVH running on %s\n", si->magic); 135 136 /* We use 3 pages of xen stack for the boot pagetables */ 137 physfree = xenstack + 3 * PAGE_SIZE - KERNBASE; 138 139 /* Setup Xen global variables */ 140 HYPERVISOR_start_info = si; 141 HYPERVISOR_shared_info = 142 (shared_info_t *)(si->shared_info + KERNBASE); 143 144 /* 145 * Setup some misc global variables for Xen devices 146 * 147 * XXX: Devices that need these specific variables should 148 * be rewritten to fetch this info by themselves from the 149 * start_info page. 150 */ 151 xen_store = (struct xenstore_domain_interface *) 152 (ptoa(si->store_mfn) + KERNBASE); 153 console_page = (char *)(ptoa(si->console.domU.mfn) + KERNBASE); 154 155 /* 156 * Use the stack Xen gives us to build the page tables 157 * as native FreeBSD expects to find them (created 158 * by the boot trampoline). 159 */ 160 for (i = 0; i < (PAGE_SIZE / sizeof(uint64_t)); i++) { 161 /* 162 * Each slot of the level 4 pages points 163 * to the same level 3 page 164 */ 165 PT4[i] = ((uint64_t)&PT3[0]) - KERNBASE; 166 PT4[i] |= PG_V | PG_RW | PG_U; 167 168 /* 169 * Each slot of the level 3 pages points 170 * to the same level 2 page 171 */ 172 PT3[i] = ((uint64_t)&PT2[0]) - KERNBASE; 173 PT3[i] |= PG_V | PG_RW | PG_U; 174 175 /* 176 * The level 2 page slots are mapped with 177 * 2MB pages for 1GB. 178 */ 179 PT2[i] = i * (2 * 1024 * 1024); 180 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U; 181 } 182 load_cr3(((uint64_t)&PT4[0]) - KERNBASE); 183 184 /* Set the hooks for early functions that diverge from bare metal */ 185 init_ops = xen_init_ops; 186 apic_ops = xen_apic_ops; 187 188 /* Now we can jump into the native init function */ 189 return (hammer_time(0, physfree)); 190 } 191 192 /*-------------------------------- PV specific -------------------------------*/ 193 #ifdef SMP 194 static bool 195 start_xen_ap(int cpu) 196 { 197 struct vcpu_guest_context *ctxt; 198 int ms, cpus = mp_naps; 199 const size_t stacksize = KSTACK_PAGES * PAGE_SIZE; 200 201 /* allocate and set up an idle stack data page */ 202 bootstacks[cpu] = 203 (void *)kmem_malloc(kernel_arena, stacksize, M_WAITOK | M_ZERO); 204 doublefault_stack = 205 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO); 206 nmi_stack = 207 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO); 208 dpcpu = 209 (void *)kmem_malloc(kernel_arena, DPCPU_SIZE, M_WAITOK | M_ZERO); 210 211 bootSTK = (char *)bootstacks[cpu] + KSTACK_PAGES * PAGE_SIZE - 8; 212 bootAP = cpu; 213 214 ctxt = malloc(sizeof(*ctxt), M_TEMP, M_WAITOK | M_ZERO); 215 if (ctxt == NULL) 216 panic("unable to allocate memory"); 217 218 ctxt->flags = VGCF_IN_KERNEL; 219 ctxt->user_regs.rip = (unsigned long) init_secondary; 220 ctxt->user_regs.rsp = (unsigned long) bootSTK; 221 222 /* Set the AP to use the same page tables */ 223 ctxt->ctrlreg[3] = KPML4phys; 224 225 if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt)) 226 panic("unable to initialize AP#%d", cpu); 227 228 free(ctxt, M_TEMP); 229 230 /* Launch the vCPU */ 231 if (HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL)) 232 panic("unable to start AP#%d", cpu); 233 234 /* Wait up to 5 seconds for it to start. */ 235 for (ms = 0; ms < 5000; ms++) { 236 if (mp_naps > cpus) 237 return (true); 238 DELAY(1000); 239 } 240 241 return (false); 242 } 243 244 static int 245 xen_pv_start_all_aps(void) 246 { 247 int cpu; 248 249 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN); 250 251 for (cpu = 1; cpu < mp_ncpus; cpu++) { 252 253 /* attempt to start the Application Processor */ 254 if (!start_xen_ap(cpu)) 255 panic("AP #%d failed to start!", cpu); 256 257 CPU_SET(cpu, &all_cpus); /* record AP in CPU map */ 258 } 259 260 return (mp_naps); 261 } 262 #endif /* SMP */ 263 264 /* 265 * Functions to convert the "extra" parameters passed by Xen 266 * into FreeBSD boot options. 267 */ 268 static void 269 xen_pv_set_env(void) 270 { 271 char *cmd_line_next, *cmd_line; 272 size_t env_size; 273 274 cmd_line = HYPERVISOR_start_info->cmd_line; 275 env_size = sizeof(HYPERVISOR_start_info->cmd_line); 276 277 /* Skip leading spaces */ 278 for (; isspace(*cmd_line) && (env_size != 0); cmd_line++) 279 env_size--; 280 281 /* Replace ',' with '\0' */ 282 for (cmd_line_next = cmd_line; strsep(&cmd_line_next, ",") != NULL;) 283 ; 284 285 init_static_kenv(cmd_line, env_size); 286 } 287 288 static void 289 xen_pv_set_boothowto(void) 290 { 291 int i; 292 293 /* get equivalents from the environment */ 294 for (i = 0; howto_names[i].ev != NULL; i++) { 295 if (getenv(howto_names[i].ev) != NULL) 296 boothowto |= howto_names[i].mask; 297 } 298 } 299 300 static caddr_t 301 xen_pv_parse_preload_data(u_int64_t modulep) 302 { 303 /* Parse the extra boot information given by Xen */ 304 xen_pv_set_env(); 305 xen_pv_set_boothowto(); 306 307 return (NULL); 308 } 309 310 static void 311 xen_pv_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx) 312 { 313 struct xen_memory_map memmap; 314 u_int32_t size; 315 int rc; 316 317 /* Fetch the E820 map from Xen */ 318 memmap.nr_entries = MAX_E820_ENTRIES; 319 set_xen_guest_handle(memmap.buffer, xen_smap); 320 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap); 321 if (rc) 322 panic("unable to fetch Xen E820 memory map"); 323 size = memmap.nr_entries * sizeof(xen_smap[0]); 324 325 bios_add_smap_entries(xen_smap, size, physmap, physmap_idx); 326 } 327