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