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