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>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
34 #include "opt_kstack_pages.h"
36 #include <sys/param.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>
44 #include <sys/rwlock.h>
46 #include <sys/ctype.h>
47 #include <sys/mutex.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>
59 #include <machine/intr_machdep.h>
60 #include <x86/apicvar.h>
62 #include <machine/pc/bios.h>
63 #include <machine/smp.h>
64 #include <machine/intr_machdep.h>
65 #include <machine/metadata.h>
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>
73 #include <xen/interface/vcpu.h>
75 #include <dev/xen/timer/timer.h>
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);
86 #define MAX_E820_ENTRIES 128
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 *);
93 static int xen_pv_start_all_aps(void);
96 /*---------------------------- Extern Declarations ---------------------------*/
98 /* Variables used by amd64 mp_machdep to start APs */
99 extern char *doublefault_stack;
100 extern char *nmi_stack;
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.
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,
117 .start_all_aps = xen_pv_start_all_aps,
119 .msi_init = xen_msi_init,
122 static struct bios_smap xen_smap[MAX_E820_ENTRIES];
124 /*-------------------------------- Xen PV init -------------------------------*/
126 * First function called by the Xen PVH boot sequence.
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.
132 hammer_time_xen(start_info_t *si, uint64_t xenstack)
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);
140 xen_domain_type = XEN_PV_DOMAIN;
141 vm_guest = VM_GUEST_XEN;
143 if ((si == NULL) || (xenstack == 0)) {
144 xc_printf("ERROR: invalid start_info or xen stack, halting\n");
145 HYPERVISOR_shutdown(SHUTDOWN_crash);
148 xc_printf("FreeBSD PVH running on %s\n", si->magic);
150 /* We use 3 pages of xen stack for the boot pagetables */
151 physfree = xenstack + 3 * PAGE_SIZE - KERNBASE;
153 /* Setup Xen global variables */
154 HYPERVISOR_start_info = si;
155 HYPERVISOR_shared_info =
156 (shared_info_t *)(si->shared_info + KERNBASE);
159 * Setup some misc global variables for Xen devices
161 * XXX: Devices that need these specific variables should
162 * be rewritten to fetch this info by themselves from the
165 xen_store = (struct xenstore_domain_interface *)
166 (ptoa(si->store_mfn) + KERNBASE);
167 console_page = (char *)(ptoa(si->console.domU.mfn) + KERNBASE);
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).
174 for (i = 0; i < (PAGE_SIZE / sizeof(uint64_t)); i++) {
176 * Each slot of the level 4 pages points
177 * to the same level 3 page
179 PT4[i] = ((uint64_t)&PT3[0]) - KERNBASE;
180 PT4[i] |= PG_V | PG_RW | PG_U;
183 * Each slot of the level 3 pages points
184 * to the same level 2 page
186 PT3[i] = ((uint64_t)&PT2[0]) - KERNBASE;
187 PT3[i] |= PG_V | PG_RW | PG_U;
190 * The level 2 page slots are mapped with
193 PT2[i] = i * (2 * 1024 * 1024);
194 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
196 load_cr3(((uint64_t)&PT4[0]) - KERNBASE);
198 /* Set the hooks for early functions that diverge from bare metal */
199 init_ops = xen_init_ops;
200 apic_ops = xen_apic_ops;
202 /* Now we can jump into the native init function */
203 return (hammer_time(0, physfree));
206 /*-------------------------------- PV specific -------------------------------*/
209 start_xen_ap(int cpu)
211 struct vcpu_guest_context *ctxt;
212 int ms, cpus = mp_naps;
213 const size_t stacksize = kstack_pages * PAGE_SIZE;
215 /* allocate and set up an idle stack data page */
217 (void *)kmem_malloc(kernel_arena, stacksize, M_WAITOK | M_ZERO);
219 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
221 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
223 (void *)kmem_malloc(kernel_arena, DPCPU_SIZE, M_WAITOK | M_ZERO);
225 bootSTK = (char *)bootstacks[cpu] + kstack_pages * PAGE_SIZE - 8;
228 ctxt = malloc(sizeof(*ctxt), M_TEMP, M_WAITOK | M_ZERO);
230 ctxt->flags = VGCF_IN_KERNEL;
231 ctxt->user_regs.rip = (unsigned long) init_secondary;
232 ctxt->user_regs.rsp = (unsigned long) bootSTK;
234 /* Set the AP to use the same page tables */
235 ctxt->ctrlreg[3] = KPML4phys;
237 if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
238 panic("unable to initialize AP#%d", cpu);
242 /* Launch the vCPU */
243 if (HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL))
244 panic("unable to start AP#%d", cpu);
246 /* Wait up to 5 seconds for it to start. */
247 for (ms = 0; ms < 5000; ms++) {
257 xen_pv_start_all_aps(void)
261 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
263 for (cpu = 1; cpu < mp_ncpus; cpu++) {
265 /* attempt to start the Application Processor */
266 if (!start_xen_ap(cpu))
267 panic("AP #%d failed to start!", cpu);
269 CPU_SET(cpu, &all_cpus); /* record AP in CPU map */
277 * Functions to convert the "extra" parameters passed by Xen
278 * into FreeBSD boot options.
283 char *cmd_line_next, *cmd_line;
286 cmd_line = HYPERVISOR_start_info->cmd_line;
287 env_size = sizeof(HYPERVISOR_start_info->cmd_line);
289 /* Skip leading spaces */
290 for (; isspace(*cmd_line) && (env_size != 0); cmd_line++)
293 /* Replace ',' with '\0' */
294 for (cmd_line_next = cmd_line; strsep(&cmd_line_next, ",") != NULL;)
297 init_static_kenv(cmd_line, 0);
301 xen_pv_set_boothowto(void)
306 /* get equivalents from the environment */
307 for (i = 0; howto_names[i].ev != NULL; i++) {
308 if ((env = kern_getenv(howto_names[i].ev)) != NULL) {
309 boothowto |= howto_names[i].mask;
317 * The way Xen loads the symtab is different from the native boot loader,
318 * because it's tailored for NetBSD. So we have to adapt and use the same
319 * method as NetBSD. Portions of the code below have been picked from NetBSD:
320 * sys/kern/kern_ksyms.c CVS Revision 1.71.
323 xen_pv_parse_symtab(void)
332 sym_end = HYPERVISOR_start_info->mod_start != 0 ?
333 HYPERVISOR_start_info->mod_start :
334 HYPERVISOR_start_info->mfn_list;
337 * Make sure the size is right headed, sym_end is just a
338 * high boundary, but at least allows us to fail earlier.
340 if ((vm_offset_t)&end + size > sym_end) {
341 xc_printf("Unable to load ELF symtab: size mismatch\n");
345 ehdr = (Elf_Ehdr *)(&end + 1);
346 if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) ||
347 ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
348 ehdr->e_version > 1) {
349 xc_printf("Unable to load ELF symtab: invalid symbol table\n");
353 shdr = (Elf_Shdr *)((uint8_t *)ehdr + ehdr->e_shoff);
354 /* Find the symbol table and the corresponding string table. */
355 for (i = 1; i < ehdr->e_shnum; i++) {
356 if (shdr[i].sh_type != SHT_SYMTAB)
358 if (shdr[i].sh_offset == 0)
360 ksymtab = (uintptr_t)((uint8_t *)ehdr + shdr[i].sh_offset);
361 ksymtab_size = shdr[i].sh_size;
363 if (shdr[j].sh_offset == 0)
364 continue; /* Can this happen? */
365 kstrtab = (uintptr_t)((uint8_t *)ehdr + shdr[j].sh_offset);
369 if (ksymtab == 0 || kstrtab == 0) {
371 "Unable to load ELF symtab: could not find symtab or strtab\n");
378 xen_pv_parse_preload_data(u_int64_t modulep)
385 if (HYPERVISOR_start_info->mod_start != 0) {
386 preload_metadata = (caddr_t)(HYPERVISOR_start_info->mod_start);
388 kmdp = preload_search_by_type("elf kernel");
390 kmdp = preload_search_by_type("elf64 kernel");
391 KASSERT(kmdp != NULL, ("unable to find kernel"));
394 * Xen has relocated the metadata and the modules,
395 * so we need to recalculate it's position. This is
396 * done by saving the original modulep address and
397 * then calculating the offset with mod_start,
398 * which contains the relocated modulep address.
400 metadata = MD_FETCH(kmdp, MODINFOMD_MODULEP, vm_paddr_t);
401 off = HYPERVISOR_start_info->mod_start - metadata;
403 preload_bootstrap_relocate(off);
405 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
406 envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
409 init_static_kenv(envp, 0);
411 /* Parse the extra boot information given by Xen */
413 xen_pv_set_boothowto();
418 xen_pv_parse_symtab();
424 xen_pv_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx)
426 struct xen_memory_map memmap;
430 /* Fetch the E820 map from Xen */
431 memmap.nr_entries = MAX_E820_ENTRIES;
432 set_xen_guest_handle(memmap.buffer, xen_smap);
433 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
435 panic("unable to fetch Xen E820 memory map");
436 size = memmap.nr_entries * sizeof(xen_smap[0]);
438 bios_add_smap_entries(xen_smap, size, physmap, physmap_idx);