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("$FreeBSD$");
32 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/reboot.h>
36 #include <sys/systm.h>
37 #include <sys/malloc.h>
39 #include <sys/rwlock.h>
41 #include <sys/ctype.h>
42 #include <sys/mutex.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>
54 #include <machine/intr_machdep.h>
55 #include <x86/apicvar.h>
57 #include <machine/pc/bios.h>
58 #include <machine/smp.h>
60 #include <xen/xen-os.h>
61 #include <xen/hypervisor.h>
62 #include <xen/xenstore/xenstorevar.h>
63 #include <xen/xen_pv.h>
65 #include <xen/interface/vcpu.h>
67 #include <dev/xen/timer/timer.h>
69 /* Native initial function */
70 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
71 /* Xen initial function */
72 uint64_t hammer_time_xen(start_info_t *, uint64_t);
74 #define MAX_E820_ENTRIES 128
76 /*--------------------------- Forward Declarations ---------------------------*/
77 static caddr_t xen_pv_parse_preload_data(u_int64_t);
78 static void xen_pv_parse_memmap(caddr_t, vm_paddr_t *, int *);
81 static int xen_pv_start_all_aps(void);
84 /*---------------------------- Extern Declarations ---------------------------*/
86 /* Variables used by amd64 mp_machdep to start APs */
87 extern struct mtx ap_boot_mtx;
88 extern void *bootstacks[];
89 extern char *doublefault_stack;
90 extern char *nmi_stack;
96 /*-------------------------------- Global Data -------------------------------*/
97 /* Xen init_ops implementation. */
98 struct init_ops xen_init_ops = {
99 .parse_preload_data = xen_pv_parse_preload_data,
100 .early_clock_source_init = xen_clock_init,
101 .early_delay = xen_delay,
102 .parse_memmap = xen_pv_parse_memmap,
104 .start_all_aps = xen_pv_start_all_aps,
108 static struct bios_smap xen_smap[MAX_E820_ENTRIES];
110 /*-------------------------------- Xen PV init -------------------------------*/
112 * First function called by the Xen PVH boot sequence.
114 * Set some Xen global variables and prepare the environment so it is
115 * as similar as possible to what native FreeBSD init function expects.
118 hammer_time_xen(start_info_t *si, uint64_t xenstack)
121 uint64_t *PT4 = (u_int64_t *)xenstack;
122 uint64_t *PT3 = (u_int64_t *)(xenstack + PAGE_SIZE);
123 uint64_t *PT2 = (u_int64_t *)(xenstack + 2 * PAGE_SIZE);
126 xen_domain_type = XEN_PV_DOMAIN;
127 vm_guest = VM_GUEST_XEN;
129 if ((si == NULL) || (xenstack == 0)) {
130 xc_printf("ERROR: invalid start_info or xen stack, halting\n");
131 HYPERVISOR_shutdown(SHUTDOWN_crash);
134 xc_printf("FreeBSD PVH running on %s\n", si->magic);
136 /* We use 3 pages of xen stack for the boot pagetables */
137 physfree = xenstack + 3 * PAGE_SIZE - KERNBASE;
139 /* Setup Xen global variables */
140 HYPERVISOR_start_info = si;
141 HYPERVISOR_shared_info =
142 (shared_info_t *)(si->shared_info + KERNBASE);
145 * Setup some misc global variables for Xen devices
147 * XXX: Devices that need these specific variables should
148 * be rewritten to fetch this info by themselves from the
151 xen_store = (struct xenstore_domain_interface *)
152 (ptoa(si->store_mfn) + KERNBASE);
153 console_page = (char *)(ptoa(si->console.domU.mfn) + KERNBASE);
156 * Use the stack Xen gives us to build the page tables
157 * as native FreeBSD expects to find them (created
158 * by the boot trampoline).
160 for (i = 0; i < (PAGE_SIZE / sizeof(uint64_t)); i++) {
162 * Each slot of the level 4 pages points
163 * to the same level 3 page
165 PT4[i] = ((uint64_t)&PT3[0]) - KERNBASE;
166 PT4[i] |= PG_V | PG_RW | PG_U;
169 * Each slot of the level 3 pages points
170 * to the same level 2 page
172 PT3[i] = ((uint64_t)&PT2[0]) - KERNBASE;
173 PT3[i] |= PG_V | PG_RW | PG_U;
176 * The level 2 page slots are mapped with
179 PT2[i] = i * (2 * 1024 * 1024);
180 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
182 load_cr3(((uint64_t)&PT4[0]) - KERNBASE);
184 /* Set the hooks for early functions that diverge from bare metal */
185 init_ops = xen_init_ops;
186 apic_ops = xen_apic_ops;
188 /* Now we can jump into the native init function */
189 return (hammer_time(0, physfree));
192 /*-------------------------------- PV specific -------------------------------*/
195 start_xen_ap(int cpu)
197 struct vcpu_guest_context *ctxt;
198 int ms, cpus = mp_naps;
199 const size_t stacksize = KSTACK_PAGES * PAGE_SIZE;
201 /* allocate and set up an idle stack data page */
203 (void *)kmem_malloc(kernel_arena, stacksize, M_WAITOK | M_ZERO);
205 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
207 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
209 (void *)kmem_malloc(kernel_arena, DPCPU_SIZE, M_WAITOK | M_ZERO);
211 bootSTK = (char *)bootstacks[cpu] + KSTACK_PAGES * PAGE_SIZE - 8;
214 ctxt = malloc(sizeof(*ctxt), M_TEMP, M_WAITOK | M_ZERO);
216 panic("unable to allocate memory");
218 ctxt->flags = VGCF_IN_KERNEL;
219 ctxt->user_regs.rip = (unsigned long) init_secondary;
220 ctxt->user_regs.rsp = (unsigned long) bootSTK;
222 /* Set the AP to use the same page tables */
223 ctxt->ctrlreg[3] = KPML4phys;
225 if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
226 panic("unable to initialize AP#%d", cpu);
230 /* Launch the vCPU */
231 if (HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL))
232 panic("unable to start AP#%d", cpu);
234 /* Wait up to 5 seconds for it to start. */
235 for (ms = 0; ms < 5000; ms++) {
245 xen_pv_start_all_aps(void)
249 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
251 for (cpu = 1; cpu < mp_ncpus; cpu++) {
253 /* attempt to start the Application Processor */
254 if (!start_xen_ap(cpu))
255 panic("AP #%d failed to start!", cpu);
257 CPU_SET(cpu, &all_cpus); /* record AP in CPU map */
265 * Functions to convert the "extra" parameters passed by Xen
266 * into FreeBSD boot options.
271 char *cmd_line_next, *cmd_line;
274 cmd_line = HYPERVISOR_start_info->cmd_line;
275 env_size = sizeof(HYPERVISOR_start_info->cmd_line);
277 /* Skip leading spaces */
278 for (; isspace(*cmd_line) && (env_size != 0); cmd_line++)
281 /* Replace ',' with '\0' */
282 for (cmd_line_next = cmd_line; strsep(&cmd_line_next, ",") != NULL;)
285 init_static_kenv(cmd_line, env_size);
289 xen_pv_set_boothowto(void)
293 /* get equivalents from the environment */
294 for (i = 0; howto_names[i].ev != NULL; i++) {
295 if (getenv(howto_names[i].ev) != NULL)
296 boothowto |= howto_names[i].mask;
301 xen_pv_parse_preload_data(u_int64_t modulep)
303 /* Parse the extra boot information given by Xen */
305 xen_pv_set_boothowto();
311 xen_pv_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx)
313 struct xen_memory_map memmap;
317 /* Fetch the E820 map from Xen */
318 memmap.nr_entries = MAX_E820_ENTRIES;
319 set_xen_guest_handle(memmap.buffer, xen_smap);
320 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
322 panic("unable to fetch Xen E820 memory map");
323 size = memmap.nr_entries * sizeof(xen_smap[0]);
325 bios_add_smap_entries(xen_smap, size, physmap, physmap_idx);