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 *mce_stack;
101 extern char *nmi_stack;
105 * Placed by the linker at the end of the bss section, which is the last
106 * section loaded by Xen before loading the symtab and strtab.
110 /*-------------------------------- Global Data -------------------------------*/
111 /* Xen init_ops implementation. */
112 struct init_ops xen_init_ops = {
113 .parse_preload_data = xen_pv_parse_preload_data,
114 .early_clock_source_init = xen_clock_init,
115 .early_delay = xen_delay,
116 .parse_memmap = xen_pv_parse_memmap,
118 .start_all_aps = xen_pv_start_all_aps,
120 .msi_init = xen_msi_init,
123 static struct bios_smap xen_smap[MAX_E820_ENTRIES];
125 /*-------------------------------- Xen PV init -------------------------------*/
127 * First function called by the Xen PVH boot sequence.
129 * Set some Xen global variables and prepare the environment so it is
130 * as similar as possible to what native FreeBSD init function expects.
133 hammer_time_xen(start_info_t *si, uint64_t xenstack)
136 uint64_t *PT4 = (u_int64_t *)xenstack;
137 uint64_t *PT3 = (u_int64_t *)(xenstack + PAGE_SIZE);
138 uint64_t *PT2 = (u_int64_t *)(xenstack + 2 * PAGE_SIZE);
141 xen_domain_type = XEN_PV_DOMAIN;
142 vm_guest = VM_GUEST_XEN;
144 if ((si == NULL) || (xenstack == 0)) {
145 xc_printf("ERROR: invalid start_info or xen stack, halting\n");
146 HYPERVISOR_shutdown(SHUTDOWN_crash);
149 xc_printf("FreeBSD PVH running on %s\n", si->magic);
151 /* We use 3 pages of xen stack for the boot pagetables */
152 physfree = xenstack + 3 * PAGE_SIZE - KERNBASE;
154 /* Setup Xen global variables */
155 HYPERVISOR_start_info = si;
156 HYPERVISOR_shared_info =
157 (shared_info_t *)(si->shared_info + KERNBASE);
160 * Setup some misc global variables for Xen devices
162 * XXX: Devices that need these specific variables should
163 * be rewritten to fetch this info by themselves from the
166 xen_store = (struct xenstore_domain_interface *)
167 (ptoa(si->store_mfn) + KERNBASE);
168 console_page = (char *)(ptoa(si->console.domU.mfn) + KERNBASE);
171 * Use the stack Xen gives us to build the page tables
172 * as native FreeBSD expects to find them (created
173 * by the boot trampoline).
175 for (i = 0; i < (PAGE_SIZE / sizeof(uint64_t)); i++) {
177 * Each slot of the level 4 pages points
178 * to the same level 3 page
180 PT4[i] = ((uint64_t)&PT3[0]) - KERNBASE;
181 PT4[i] |= PG_V | PG_RW | PG_U;
184 * Each slot of the level 3 pages points
185 * to the same level 2 page
187 PT3[i] = ((uint64_t)&PT2[0]) - KERNBASE;
188 PT3[i] |= PG_V | PG_RW | PG_U;
191 * The level 2 page slots are mapped with
194 PT2[i] = i * (2 * 1024 * 1024);
195 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
197 load_cr3(((uint64_t)&PT4[0]) - KERNBASE);
199 /* Set the hooks for early functions that diverge from bare metal */
200 init_ops = xen_init_ops;
201 apic_ops = xen_apic_ops;
203 /* Now we can jump into the native init function */
204 return (hammer_time(0, physfree));
207 /*-------------------------------- PV specific -------------------------------*/
210 start_xen_ap(int cpu)
212 struct vcpu_guest_context *ctxt;
213 int ms, cpus = mp_naps;
214 const size_t stacksize = kstack_pages * PAGE_SIZE;
216 /* allocate and set up an idle stack data page */
218 (void *)kmem_malloc(kernel_arena, stacksize, M_WAITOK | M_ZERO);
220 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
222 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
224 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
226 (void *)kmem_malloc(kernel_arena, DPCPU_SIZE, M_WAITOK | M_ZERO);
228 bootSTK = (char *)bootstacks[cpu] + kstack_pages * PAGE_SIZE - 8;
231 ctxt = malloc(sizeof(*ctxt), M_TEMP, M_WAITOK | M_ZERO);
233 ctxt->flags = VGCF_IN_KERNEL;
234 ctxt->user_regs.rip = (unsigned long) init_secondary;
235 ctxt->user_regs.rsp = (unsigned long) bootSTK;
237 /* Set the AP to use the same page tables */
238 ctxt->ctrlreg[3] = KPML4phys;
240 if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
241 panic("unable to initialize AP#%d", cpu);
245 /* Launch the vCPU */
246 if (HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL))
247 panic("unable to start AP#%d", cpu);
249 /* Wait up to 5 seconds for it to start. */
250 for (ms = 0; ms < 5000; ms++) {
260 xen_pv_start_all_aps(void)
264 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
266 for (cpu = 1; cpu < mp_ncpus; cpu++) {
268 /* attempt to start the Application Processor */
269 if (!start_xen_ap(cpu))
270 panic("AP #%d failed to start!", cpu);
272 CPU_SET(cpu, &all_cpus); /* record AP in CPU map */
280 * Functions to convert the "extra" parameters passed by Xen
281 * into FreeBSD boot options.
286 char *cmd_line_next, *cmd_line;
289 cmd_line = HYPERVISOR_start_info->cmd_line;
290 env_size = sizeof(HYPERVISOR_start_info->cmd_line);
292 /* Skip leading spaces */
293 for (; isspace(*cmd_line) && (env_size != 0); cmd_line++)
296 /* Replace ',' with '\0' */
297 for (cmd_line_next = cmd_line; strsep(&cmd_line_next, ",") != NULL;)
300 init_static_kenv(cmd_line, 0);
305 * The way Xen loads the symtab is different from the native boot loader,
306 * because it's tailored for NetBSD. So we have to adapt and use the same
307 * method as NetBSD. Portions of the code below have been picked from NetBSD:
308 * sys/kern/kern_ksyms.c CVS Revision 1.71.
311 xen_pv_parse_symtab(void)
320 sym_end = HYPERVISOR_start_info->mod_start != 0 ?
321 HYPERVISOR_start_info->mod_start :
322 HYPERVISOR_start_info->mfn_list;
325 * Make sure the size is right headed, sym_end is just a
326 * high boundary, but at least allows us to fail earlier.
328 if ((vm_offset_t)&end + size > sym_end) {
329 xc_printf("Unable to load ELF symtab: size mismatch\n");
333 ehdr = (Elf_Ehdr *)(&end + 1);
334 if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) ||
335 ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
336 ehdr->e_version > 1) {
337 xc_printf("Unable to load ELF symtab: invalid symbol table\n");
341 shdr = (Elf_Shdr *)((uint8_t *)ehdr + ehdr->e_shoff);
342 /* Find the symbol table and the corresponding string table. */
343 for (i = 1; i < ehdr->e_shnum; i++) {
344 if (shdr[i].sh_type != SHT_SYMTAB)
346 if (shdr[i].sh_offset == 0)
348 ksymtab = (uintptr_t)((uint8_t *)ehdr + shdr[i].sh_offset);
349 ksymtab_size = shdr[i].sh_size;
351 if (shdr[j].sh_offset == 0)
352 continue; /* Can this happen? */
353 kstrtab = (uintptr_t)((uint8_t *)ehdr + shdr[j].sh_offset);
357 if (ksymtab == 0 || kstrtab == 0) {
359 "Unable to load ELF symtab: could not find symtab or strtab\n");
366 xen_pv_parse_preload_data(u_int64_t modulep)
373 if (HYPERVISOR_start_info->mod_start != 0) {
374 preload_metadata = (caddr_t)(HYPERVISOR_start_info->mod_start);
376 kmdp = preload_search_by_type("elf kernel");
378 kmdp = preload_search_by_type("elf64 kernel");
379 KASSERT(kmdp != NULL, ("unable to find kernel"));
382 * Xen has relocated the metadata and the modules,
383 * so we need to recalculate it's position. This is
384 * done by saving the original modulep address and
385 * then calculating the offset with mod_start,
386 * which contains the relocated modulep address.
388 metadata = MD_FETCH(kmdp, MODINFOMD_MODULEP, vm_paddr_t);
389 off = HYPERVISOR_start_info->mod_start - metadata;
391 preload_bootstrap_relocate(off);
393 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
394 envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
397 init_static_kenv(envp, 0);
399 /* Parse the extra boot information given by Xen */
401 boothowto |= boot_env_to_howto();
406 xen_pv_parse_symtab();
412 xen_pv_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx)
414 struct xen_memory_map memmap;
418 /* Fetch the E820 map from Xen */
419 memmap.nr_entries = MAX_E820_ENTRIES;
420 set_xen_guest_handle(memmap.buffer, xen_smap);
421 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
423 panic("unable to fetch Xen E820 memory map");
424 size = memmap.nr_entries * sizeof(xen_smap[0]);
426 bios_add_smap_entries(xen_smap, size, physmap, physmap_idx);