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>
55 #include <machine/pc/bios.h>
56 #include <machine/smp.h>
58 #include <xen/xen-os.h>
59 #include <xen/hypervisor.h>
60 #include <xen/xenstore/xenstorevar.h>
62 #include <xen/interface/vcpu.h>
64 #include <dev/xen/timer/timer.h>
66 /* Native initial function */
67 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
68 /* Xen initial function */
69 uint64_t hammer_time_xen(start_info_t *, uint64_t);
71 #define MAX_E820_ENTRIES 128
73 /*--------------------------- Forward Declarations ---------------------------*/
74 static caddr_t xen_pv_parse_preload_data(u_int64_t);
75 static void xen_pv_parse_memmap(caddr_t, vm_paddr_t *, int *);
78 static int xen_pv_start_all_aps(void);
81 /*---------------------------- Extern Declarations ---------------------------*/
83 /* Variables used by amd64 mp_machdep to start APs */
84 extern struct mtx ap_boot_mtx;
85 extern void *bootstacks[];
86 extern char *doublefault_stack;
87 extern char *nmi_stack;
93 /*-------------------------------- Global Data -------------------------------*/
94 /* Xen init_ops implementation. */
95 struct init_ops xen_init_ops = {
96 .parse_preload_data = xen_pv_parse_preload_data,
97 .early_clock_source_init = xen_clock_init,
98 .early_delay = xen_delay,
99 .parse_memmap = xen_pv_parse_memmap,
101 .start_all_aps = xen_pv_start_all_aps,
105 static struct bios_smap xen_smap[MAX_E820_ENTRIES];
107 /*-------------------------------- Xen PV init -------------------------------*/
109 * First function called by the Xen PVH boot sequence.
111 * Set some Xen global variables and prepare the environment so it is
112 * as similar as possible to what native FreeBSD init function expects.
115 hammer_time_xen(start_info_t *si, uint64_t xenstack)
118 uint64_t *PT4 = (u_int64_t *)xenstack;
119 uint64_t *PT3 = (u_int64_t *)(xenstack + PAGE_SIZE);
120 uint64_t *PT2 = (u_int64_t *)(xenstack + 2 * PAGE_SIZE);
123 xen_domain_type = XEN_PV_DOMAIN;
124 vm_guest = VM_GUEST_XEN;
126 if ((si == NULL) || (xenstack == 0)) {
127 xc_printf("ERROR: invalid start_info or xen stack, halting\n");
128 HYPERVISOR_shutdown(SHUTDOWN_crash);
131 xc_printf("FreeBSD PVH running on %s\n", si->magic);
133 /* We use 3 pages of xen stack for the boot pagetables */
134 physfree = xenstack + 3 * PAGE_SIZE - KERNBASE;
136 /* Setup Xen global variables */
137 HYPERVISOR_start_info = si;
138 HYPERVISOR_shared_info =
139 (shared_info_t *)(si->shared_info + KERNBASE);
142 * Setup some misc global variables for Xen devices
144 * XXX: Devices that need these specific variables should
145 * be rewritten to fetch this info by themselves from the
148 xen_store = (struct xenstore_domain_interface *)
149 (ptoa(si->store_mfn) + KERNBASE);
150 console_page = (char *)(ptoa(si->console.domU.mfn) + KERNBASE);
153 * Use the stack Xen gives us to build the page tables
154 * as native FreeBSD expects to find them (created
155 * by the boot trampoline).
157 for (i = 0; i < (PAGE_SIZE / sizeof(uint64_t)); i++) {
158 /* Each slot of the level 4 pages points to the same level 3 page */
159 PT4[i] = ((uint64_t)&PT3[0]) - KERNBASE;
160 PT4[i] |= PG_V | PG_RW | PG_U;
162 /* Each slot of the level 3 pages points to the same level 2 page */
163 PT3[i] = ((uint64_t)&PT2[0]) - KERNBASE;
164 PT3[i] |= PG_V | PG_RW | PG_U;
166 /* The level 2 page slots are mapped with 2MB pages for 1GB. */
167 PT2[i] = i * (2 * 1024 * 1024);
168 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
170 load_cr3(((uint64_t)&PT4[0]) - KERNBASE);
172 /* Set the hooks for early functions that diverge from bare metal */
173 init_ops = xen_init_ops;
175 /* Now we can jump into the native init function */
176 return (hammer_time(0, physfree));
179 /*-------------------------------- PV specific -------------------------------*/
182 start_xen_ap(int cpu)
184 struct vcpu_guest_context *ctxt;
185 int ms, cpus = mp_naps;
186 const size_t stacksize = KSTACK_PAGES * PAGE_SIZE;
188 /* allocate and set up an idle stack data page */
190 (void *)kmem_malloc(kernel_arena, stacksize, M_WAITOK | M_ZERO);
192 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
194 (char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
196 (void *)kmem_malloc(kernel_arena, DPCPU_SIZE, M_WAITOK | M_ZERO);
198 bootSTK = (char *)bootstacks[cpu] + KSTACK_PAGES * PAGE_SIZE - 8;
201 ctxt = malloc(sizeof(*ctxt), M_TEMP, M_WAITOK | M_ZERO);
203 panic("unable to allocate memory");
205 ctxt->flags = VGCF_IN_KERNEL;
206 ctxt->user_regs.rip = (unsigned long) init_secondary;
207 ctxt->user_regs.rsp = (unsigned long) bootSTK;
209 /* Set the AP to use the same page tables */
210 ctxt->ctrlreg[3] = KPML4phys;
212 if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
213 panic("unable to initialize AP#%d", cpu);
217 /* Launch the vCPU */
218 if (HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL))
219 panic("unable to start AP#%d", cpu);
221 /* Wait up to 5 seconds for it to start. */
222 for (ms = 0; ms < 5000; ms++) {
232 xen_pv_start_all_aps(void)
236 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
238 for (cpu = 1; cpu < mp_ncpus; cpu++) {
240 /* attempt to start the Application Processor */
241 if (!start_xen_ap(cpu))
242 panic("AP #%d failed to start!", cpu);
244 CPU_SET(cpu, &all_cpus); /* record AP in CPU map */
252 * Functions to convert the "extra" parameters passed by Xen
253 * into FreeBSD boot options.
258 char *cmd_line_next, *cmd_line;
261 cmd_line = HYPERVISOR_start_info->cmd_line;
262 env_size = sizeof(HYPERVISOR_start_info->cmd_line);
264 /* Skip leading spaces */
265 for (; isspace(*cmd_line) && (env_size != 0); cmd_line++)
268 /* Replace ',' with '\0' */
269 for (cmd_line_next = cmd_line; strsep(&cmd_line_next, ",") != NULL;)
272 init_static_kenv(cmd_line, env_size);
276 xen_pv_set_boothowto(void)
280 /* get equivalents from the environment */
281 for (i = 0; howto_names[i].ev != NULL; i++) {
282 if (getenv(howto_names[i].ev) != NULL)
283 boothowto |= howto_names[i].mask;
288 xen_pv_parse_preload_data(u_int64_t modulep)
290 /* Parse the extra boot information given by Xen */
292 xen_pv_set_boothowto();
298 xen_pv_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx)
300 struct xen_memory_map memmap;
304 /* Fetch the E820 map from Xen */
305 memmap.nr_entries = MAX_E820_ENTRIES;
306 set_xen_guest_handle(memmap.buffer, xen_smap);
307 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
309 panic("unable to fetch Xen E820 memory map");
310 size = memmap.nr_entries * sizeof(xen_smap[0]);
312 bios_add_smap_entries(xen_smap, size, physmap, physmap_idx);