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>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
36 #include <sys/kernel.h>
37 #include <sys/reboot.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
40 #include <sys/linker.h>
42 #include <sys/rwlock.h>
44 #include <sys/ctype.h>
45 #include <sys/mutex.h>
49 #include <vm/vm_extern.h>
50 #include <vm/vm_kern.h>
51 #include <vm/vm_page.h>
52 #include <vm/vm_map.h>
53 #include <vm/vm_object.h>
54 #include <vm/vm_pager.h>
55 #include <vm/vm_param.h>
57 #include <machine/intr_machdep.h>
58 #include <x86/apicvar.h>
60 #include <machine/pc/bios.h>
61 #include <machine/smp.h>
63 #include <xen/xen-os.h>
64 #include <xen/hypervisor.h>
65 #include <xen/xenstore/xenstorevar.h>
66 #include <xen/xen_pv.h>
68 #include <xen/interface/vcpu.h>
70 #include <dev/xen/timer/timer.h>
76 /* Native initial function */
77 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
78 /* Xen initial function */
79 uint64_t hammer_time_xen(start_info_t *, uint64_t);
81 #define MAX_E820_ENTRIES 128
83 /*--------------------------- Forward Declarations ---------------------------*/
84 static caddr_t xen_pv_parse_preload_data(u_int64_t);
85 static void xen_pv_parse_memmap(caddr_t, vm_paddr_t *, int *);
88 static int xen_pv_start_all_aps(void);
91 /*---------------------------- Extern Declarations ---------------------------*/
93 /* Variables used by amd64 mp_machdep to start APs */
94 extern struct mtx ap_boot_mtx;
95 extern void *bootstacks[];
96 extern char *doublefault_stack;
97 extern char *nmi_stack;
100 extern char *bootSTK;
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,
121 static struct bios_smap xen_smap[MAX_E820_ENTRIES];
123 /*-------------------------------- Xen PV init -------------------------------*/
125 * First function called by the Xen PVH boot sequence.
127 * Set some Xen global variables and prepare the environment so it is
128 * as similar as possible to what native FreeBSD init function expects.
131 hammer_time_xen(start_info_t *si, uint64_t xenstack)
134 uint64_t *PT4 = (u_int64_t *)xenstack;
135 uint64_t *PT3 = (u_int64_t *)(xenstack + PAGE_SIZE);
136 uint64_t *PT2 = (u_int64_t *)(xenstack + 2 * PAGE_SIZE);
139 xen_domain_type = XEN_PV_DOMAIN;
140 vm_guest = VM_GUEST_XEN;
142 if ((si == NULL) || (xenstack == 0)) {
143 xc_printf("ERROR: invalid start_info or xen stack, halting\n");
144 HYPERVISOR_shutdown(SHUTDOWN_crash);
147 xc_printf("FreeBSD PVH running on %s\n", si->magic);
149 /* We use 3 pages of xen stack for the boot pagetables */
150 physfree = xenstack + 3 * PAGE_SIZE - KERNBASE;
152 /* Setup Xen global variables */
153 HYPERVISOR_start_info = si;
154 HYPERVISOR_shared_info =
155 (shared_info_t *)(si->shared_info + KERNBASE);
158 * Setup some misc global variables for Xen devices
160 * XXX: Devices that need these specific variables should
161 * be rewritten to fetch this info by themselves from the
164 xen_store = (struct xenstore_domain_interface *)
165 (ptoa(si->store_mfn) + KERNBASE);
166 console_page = (char *)(ptoa(si->console.domU.mfn) + KERNBASE);
169 * Use the stack Xen gives us to build the page tables
170 * as native FreeBSD expects to find them (created
171 * by the boot trampoline).
173 for (i = 0; i < (PAGE_SIZE / sizeof(uint64_t)); i++) {
175 * Each slot of the level 4 pages points
176 * to the same level 3 page
178 PT4[i] = ((uint64_t)&PT3[0]) - KERNBASE;
179 PT4[i] |= PG_V | PG_RW | PG_U;
182 * Each slot of the level 3 pages points
183 * to the same level 2 page
185 PT3[i] = ((uint64_t)&PT2[0]) - KERNBASE;
186 PT3[i] |= PG_V | PG_RW | PG_U;
189 * The level 2 page slots are mapped with
192 PT2[i] = i * (2 * 1024 * 1024);
193 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
195 load_cr3(((uint64_t)&PT4[0]) - KERNBASE);
197 /* Set the hooks for early functions that diverge from bare metal */
198 init_ops = xen_init_ops;
199 apic_ops = xen_apic_ops;
201 /* Now we can jump into the native init function */
202 return (hammer_time(0, physfree));
205 /*-------------------------------- PV specific -------------------------------*/
208 start_xen_ap(int cpu)
210 struct vcpu_guest_context *ctxt;
211 int ms, cpus = mp_naps;
212 const size_t stacksize = KSTACK_PAGES * PAGE_SIZE;
214 /* allocate and set up an idle stack data page */
216 (void *)kmem_malloc(kernel_arena, stacksize, M_WAITOK | M_ZERO);
218 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
220 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
222 (void *)kmem_malloc(kernel_arena, DPCPU_SIZE, M_WAITOK | M_ZERO);
224 bootSTK = (char *)bootstacks[cpu] + KSTACK_PAGES * PAGE_SIZE - 8;
227 ctxt = malloc(sizeof(*ctxt), M_TEMP, M_WAITOK | M_ZERO);
229 panic("unable to allocate memory");
231 ctxt->flags = VGCF_IN_KERNEL;
232 ctxt->user_regs.rip = (unsigned long) init_secondary;
233 ctxt->user_regs.rsp = (unsigned long) bootSTK;
235 /* Set the AP to use the same page tables */
236 ctxt->ctrlreg[3] = KPML4phys;
238 if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
239 panic("unable to initialize AP#%d", cpu);
243 /* Launch the vCPU */
244 if (HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL))
245 panic("unable to start AP#%d", cpu);
247 /* Wait up to 5 seconds for it to start. */
248 for (ms = 0; ms < 5000; ms++) {
258 xen_pv_start_all_aps(void)
262 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
264 for (cpu = 1; cpu < mp_ncpus; cpu++) {
266 /* attempt to start the Application Processor */
267 if (!start_xen_ap(cpu))
268 panic("AP #%d failed to start!", cpu);
270 CPU_SET(cpu, &all_cpus); /* record AP in CPU map */
278 * Functions to convert the "extra" parameters passed by Xen
279 * into FreeBSD boot options.
284 char *cmd_line_next, *cmd_line;
287 cmd_line = HYPERVISOR_start_info->cmd_line;
288 env_size = sizeof(HYPERVISOR_start_info->cmd_line);
290 /* Skip leading spaces */
291 for (; isspace(*cmd_line) && (env_size != 0); cmd_line++)
294 /* Replace ',' with '\0' */
295 for (cmd_line_next = cmd_line; strsep(&cmd_line_next, ",") != NULL;)
298 init_static_kenv(cmd_line, env_size);
302 xen_pv_set_boothowto(void)
306 /* get equivalents from the environment */
307 for (i = 0; howto_names[i].ev != NULL; i++) {
308 if (getenv(howto_names[i].ev) != NULL)
309 boothowto |= howto_names[i].mask;
315 * The way Xen loads the symtab is different from the native boot loader,
316 * because it's tailored for NetBSD. So we have to adapt and use the same
317 * method as NetBSD. Portions of the code below have been picked from NetBSD:
318 * sys/kern/kern_ksyms.c CVS Revision 1.71.
321 xen_pv_parse_symtab(void)
330 sym_end = HYPERVISOR_start_info->mod_start != 0 ?
331 HYPERVISOR_start_info->mod_start :
332 HYPERVISOR_start_info->mfn_list;
335 * Make sure the size is right headed, sym_end is just a
336 * high boundary, but at least allows us to fail earlier.
338 if ((vm_offset_t)&end + size > sym_end) {
339 xc_printf("Unable to load ELF symtab: size mismatch\n");
343 ehdr = (Elf_Ehdr *)(&end + 1);
344 if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) ||
345 ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
346 ehdr->e_version > 1) {
347 xc_printf("Unable to load ELF symtab: invalid symbol table\n");
351 shdr = (Elf_Shdr *)((uint8_t *)ehdr + ehdr->e_shoff);
352 /* Find the symbol table and the corresponding string table. */
353 for (i = 1; i < ehdr->e_shnum; i++) {
354 if (shdr[i].sh_type != SHT_SYMTAB)
356 if (shdr[i].sh_offset == 0)
358 ksymtab = (uintptr_t)((uint8_t *)ehdr + shdr[i].sh_offset);
359 ksymtab_size = shdr[i].sh_size;
361 if (shdr[j].sh_offset == 0)
362 continue; /* Can this happen? */
363 kstrtab = (uintptr_t)((uint8_t *)ehdr + shdr[j].sh_offset);
367 if (ksymtab == 0 || kstrtab == 0) {
369 "Unable to load ELF symtab: could not find symtab or strtab\n");
376 xen_pv_parse_preload_data(u_int64_t modulep)
378 /* Parse the extra boot information given by Xen */
380 xen_pv_set_boothowto();
383 xen_pv_parse_symtab();
390 xen_pv_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx)
392 struct xen_memory_map memmap;
396 /* Fetch the E820 map from Xen */
397 memmap.nr_entries = MAX_E820_ENTRIES;
398 set_xen_guest_handle(memmap.buffer, xen_smap);
399 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
401 panic("unable to fetch Xen E820 memory map");
402 size = memmap.nr_entries * sizeof(xen_smap[0]);
404 bios_add_smap_entries(xen_smap, size, physmap, physmap_idx);