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 <x86/init.h> 55 #include <machine/pc/bios.h> 56 #include <machine/smp.h> 57 58 #include <xen/xen-os.h> 59 #include <xen/hypervisor.h> 60 #include <xen/xenstore/xenstorevar.h> 61 #include <xen/xen_pv.h> 62 63 #include <xen/interface/vcpu.h> 64 65 #include <dev/xen/timer/timer.h> 66 67 /* Native initial function */ 68 extern u_int64_t hammer_time(u_int64_t, u_int64_t); 69 /* Xen initial function */ 70 uint64_t hammer_time_xen(start_info_t *, uint64_t); 71 72 #define MAX_E820_ENTRIES 128 73 74 /*--------------------------- Forward Declarations ---------------------------*/ 75 static caddr_t xen_pv_parse_preload_data(u_int64_t); 76 static void xen_pv_parse_memmap(caddr_t, vm_paddr_t *, int *); 77 78 #ifdef SMP 79 static int xen_pv_start_all_aps(void); 80 #endif 81 82 /*---------------------------- Extern Declarations ---------------------------*/ 83 #ifdef SMP 84 /* Variables used by amd64 mp_machdep to start APs */ 85 extern struct mtx ap_boot_mtx; 86 extern void *bootstacks[]; 87 extern char *doublefault_stack; 88 extern char *nmi_stack; 89 extern void *dpcpu; 90 extern int bootAP; 91 extern char *bootSTK; 92 #endif 93 94 /*-------------------------------- Global Data -------------------------------*/ 95 /* Xen init_ops implementation. */ 96 struct init_ops xen_init_ops = { 97 .parse_preload_data = xen_pv_parse_preload_data, 98 .early_clock_source_init = xen_clock_init, 99 .early_delay = xen_delay, 100 .parse_memmap = xen_pv_parse_memmap, 101 #ifdef SMP 102 .start_all_aps = xen_pv_start_all_aps, 103 #endif 104 }; 105 106 static struct bios_smap xen_smap[MAX_E820_ENTRIES]; 107 108 /*-------------------------------- Xen PV init -------------------------------*/ 109 /* 110 * First function called by the Xen PVH boot sequence. 111 * 112 * Set some Xen global variables and prepare the environment so it is 113 * as similar as possible to what native FreeBSD init function expects. 114 */ 115 uint64_t 116 hammer_time_xen(start_info_t *si, uint64_t xenstack) 117 { 118 uint64_t physfree; 119 uint64_t *PT4 = (u_int64_t *)xenstack; 120 uint64_t *PT3 = (u_int64_t *)(xenstack + PAGE_SIZE); 121 uint64_t *PT2 = (u_int64_t *)(xenstack + 2 * PAGE_SIZE); 122 int i; 123 124 xen_domain_type = XEN_PV_DOMAIN; 125 vm_guest = VM_GUEST_XEN; 126 127 if ((si == NULL) || (xenstack == 0)) { 128 xc_printf("ERROR: invalid start_info or xen stack, halting\n"); 129 HYPERVISOR_shutdown(SHUTDOWN_crash); 130 } 131 132 xc_printf("FreeBSD PVH running on %s\n", si->magic); 133 134 /* We use 3 pages of xen stack for the boot pagetables */ 135 physfree = xenstack + 3 * PAGE_SIZE - KERNBASE; 136 137 /* Setup Xen global variables */ 138 HYPERVISOR_start_info = si; 139 HYPERVISOR_shared_info = 140 (shared_info_t *)(si->shared_info + KERNBASE); 141 142 /* 143 * Setup some misc global variables for Xen devices 144 * 145 * XXX: Devices that need these specific variables should 146 * be rewritten to fetch this info by themselves from the 147 * start_info page. 148 */ 149 xen_store = (struct xenstore_domain_interface *) 150 (ptoa(si->store_mfn) + KERNBASE); 151 console_page = (char *)(ptoa(si->console.domU.mfn) + KERNBASE); 152 153 /* 154 * Use the stack Xen gives us to build the page tables 155 * as native FreeBSD expects to find them (created 156 * by the boot trampoline). 157 */ 158 for (i = 0; i < (PAGE_SIZE / sizeof(uint64_t)); i++) { 159 /* 160 * Each slot of the level 4 pages points 161 * to the same level 3 page 162 */ 163 PT4[i] = ((uint64_t)&PT3[0]) - KERNBASE; 164 PT4[i] |= PG_V | PG_RW | PG_U; 165 166 /* 167 * Each slot of the level 3 pages points 168 * to the same level 2 page 169 */ 170 PT3[i] = ((uint64_t)&PT2[0]) - KERNBASE; 171 PT3[i] |= PG_V | PG_RW | PG_U; 172 173 /* 174 * The level 2 page slots are mapped with 175 * 2MB pages for 1GB. 176 */ 177 PT2[i] = i * (2 * 1024 * 1024); 178 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U; 179 } 180 load_cr3(((uint64_t)&PT4[0]) - KERNBASE); 181 182 /* Set the hooks for early functions that diverge from bare metal */ 183 init_ops = xen_init_ops; 184 apic_ops = xen_apic_ops; 185 186 /* Now we can jump into the native init function */ 187 return (hammer_time(0, physfree)); 188 } 189 190 /*-------------------------------- PV specific -------------------------------*/ 191 #ifdef SMP 192 static bool 193 start_xen_ap(int cpu) 194 { 195 struct vcpu_guest_context *ctxt; 196 int ms, cpus = mp_naps; 197 const size_t stacksize = KSTACK_PAGES * PAGE_SIZE; 198 199 /* allocate and set up an idle stack data page */ 200 bootstacks[cpu] = 201 (void *)kmem_malloc(kernel_arena, stacksize, M_WAITOK | M_ZERO); 202 doublefault_stack = 203 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO); 204 nmi_stack = 205 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO); 206 dpcpu = 207 (void *)kmem_malloc(kernel_arena, DPCPU_SIZE, M_WAITOK | M_ZERO); 208 209 bootSTK = (char *)bootstacks[cpu] + KSTACK_PAGES * PAGE_SIZE - 8; 210 bootAP = cpu; 211 212 ctxt = malloc(sizeof(*ctxt), M_TEMP, M_WAITOK | M_ZERO); 213 if (ctxt == NULL) 214 panic("unable to allocate memory"); 215 216 ctxt->flags = VGCF_IN_KERNEL; 217 ctxt->user_regs.rip = (unsigned long) init_secondary; 218 ctxt->user_regs.rsp = (unsigned long) bootSTK; 219 220 /* Set the AP to use the same page tables */ 221 ctxt->ctrlreg[3] = KPML4phys; 222 223 if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt)) 224 panic("unable to initialize AP#%d", cpu); 225 226 free(ctxt, M_TEMP); 227 228 /* Launch the vCPU */ 229 if (HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL)) 230 panic("unable to start AP#%d", cpu); 231 232 /* Wait up to 5 seconds for it to start. */ 233 for (ms = 0; ms < 5000; ms++) { 234 if (mp_naps > cpus) 235 return (true); 236 DELAY(1000); 237 } 238 239 return (false); 240 } 241 242 static int 243 xen_pv_start_all_aps(void) 244 { 245 int cpu; 246 247 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN); 248 249 for (cpu = 1; cpu < mp_ncpus; cpu++) { 250 251 /* attempt to start the Application Processor */ 252 if (!start_xen_ap(cpu)) 253 panic("AP #%d failed to start!", cpu); 254 255 CPU_SET(cpu, &all_cpus); /* record AP in CPU map */ 256 } 257 258 return (mp_naps); 259 } 260 #endif /* SMP */ 261 262 /* 263 * Functions to convert the "extra" parameters passed by Xen 264 * into FreeBSD boot options. 265 */ 266 static void 267 xen_pv_set_env(void) 268 { 269 char *cmd_line_next, *cmd_line; 270 size_t env_size; 271 272 cmd_line = HYPERVISOR_start_info->cmd_line; 273 env_size = sizeof(HYPERVISOR_start_info->cmd_line); 274 275 /* Skip leading spaces */ 276 for (; isspace(*cmd_line) && (env_size != 0); cmd_line++) 277 env_size--; 278 279 /* Replace ',' with '\0' */ 280 for (cmd_line_next = cmd_line; strsep(&cmd_line_next, ",") != NULL;) 281 ; 282 283 init_static_kenv(cmd_line, env_size); 284 } 285 286 static void 287 xen_pv_set_boothowto(void) 288 { 289 int i; 290 291 /* get equivalents from the environment */ 292 for (i = 0; howto_names[i].ev != NULL; i++) { 293 if (getenv(howto_names[i].ev) != NULL) 294 boothowto |= howto_names[i].mask; 295 } 296 } 297 298 static caddr_t 299 xen_pv_parse_preload_data(u_int64_t modulep) 300 { 301 /* Parse the extra boot information given by Xen */ 302 xen_pv_set_env(); 303 xen_pv_set_boothowto(); 304 305 return (NULL); 306 } 307 308 static void 309 xen_pv_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx) 310 { 311 struct xen_memory_map memmap; 312 u_int32_t size; 313 int rc; 314 315 /* Fetch the E820 map from Xen */ 316 memmap.nr_entries = MAX_E820_ENTRIES; 317 set_xen_guest_handle(memmap.buffer, xen_smap); 318 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap); 319 if (rc) 320 panic("unable to fetch Xen E820 memory map"); 321 size = memmap.nr_entries * sizeof(xen_smap[0]); 322 323 bios_add_smap_entries(xen_smap, size, physmap, physmap_idx); 324 } 325