2 #include <xen/events.h>
3 #include <xen/grant_table.h>
5 #include <xen/interface/vcpu.h>
6 #include <xen/interface/xen.h>
7 #include <xen/interface/memory.h>
8 #include <xen/interface/hvm/params.h>
9 #include <xen/features.h>
10 #include <xen/platform_pci.h>
11 #include <xen/xenbus.h>
13 #include <xen/interface/sched.h>
14 #include <xen/xen-ops.h>
15 #include <asm/xen/hypervisor.h>
16 #include <asm/xen/hypercall.h>
17 #include <asm/system_misc.h>
18 #include <linux/interrupt.h>
19 #include <linux/irqreturn.h>
20 #include <linux/module.h>
22 #include <linux/of_irq.h>
23 #include <linux/of_address.h>
24 #include <linux/cpuidle.h>
25 #include <linux/cpufreq.h>
26 #include <linux/cpu.h>
27 #include <linux/console.h>
31 struct start_info _xen_start_info;
32 struct start_info *xen_start_info = &_xen_start_info;
33 EXPORT_SYMBOL(xen_start_info);
35 enum xen_domain_type xen_domain_type = XEN_NATIVE;
36 EXPORT_SYMBOL(xen_domain_type);
38 struct shared_info xen_dummy_shared_info;
39 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
41 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
42 static struct vcpu_info __percpu *xen_vcpu_info;
44 /* These are unused until we support booting "pre-ballooned" */
45 unsigned long xen_released_pages;
46 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
48 /* TODO: to be removed */
49 __read_mostly int xen_have_vector_callback;
50 EXPORT_SYMBOL_GPL(xen_have_vector_callback);
52 int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
53 EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
55 static __read_mostly unsigned int xen_events_irq;
57 static __initdata struct device_node *xen_node;
59 int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
61 xen_pfn_t *mfn, int nr,
62 int *err_ptr, pgprot_t prot,
66 return xen_xlate_remap_gfn_array(vma, addr, mfn, nr, err_ptr,
69 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_array);
71 /* Not used by XENFEAT_auto_translated guests. */
72 int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
74 xen_pfn_t mfn, int nr,
75 pgprot_t prot, unsigned domid,
80 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
82 int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
83 int nr, struct page **pages)
85 return xen_xlate_unmap_gfn_range(vma, nr, pages);
87 EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
89 static void xen_percpu_init(void)
91 struct vcpu_register_vcpu_info info;
92 struct vcpu_info *vcpup;
96 pr_info("Xen: initializing cpu%d\n", cpu);
97 vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
99 info.mfn = __pa(vcpup) >> PAGE_SHIFT;
100 info.offset = offset_in_page(vcpup);
102 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
104 per_cpu(xen_vcpu, cpu) = vcpup;
106 enable_percpu_irq(xen_events_irq, 0);
110 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
112 struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
114 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
118 static void xen_power_off(void)
120 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
122 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
126 static int xen_cpu_notification(struct notifier_block *self,
127 unsigned long action,
141 static struct notifier_block xen_cpu_notifier = {
142 .notifier_call = xen_cpu_notification,
145 static irqreturn_t xen_arm_callback(int irq, void *arg)
147 xen_hvm_evtchn_do_upcall();
152 * see Documentation/devicetree/bindings/arm/xen.txt for the
153 * documentation of the Xen Device Tree format.
155 #define GRANT_TABLE_PHYSADDR 0
156 void __init xen_early_init(void)
159 const char *s = NULL;
160 const char *version = NULL;
161 const char *xen_prefix = "xen,xen-";
163 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
165 pr_debug("No Xen support\n");
168 s = of_get_property(xen_node, "compatible", &len);
169 if (strlen(xen_prefix) + 3 < len &&
170 !strncmp(xen_prefix, s, strlen(xen_prefix)))
171 version = s + strlen(xen_prefix);
172 if (version == NULL) {
173 pr_debug("Xen version not found\n");
177 pr_info("Xen %s support found\n", version);
179 xen_domain_type = XEN_HVM_DOMAIN;
181 xen_setup_features();
183 if (xen_feature(XENFEAT_dom0))
184 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
186 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
188 if (!console_set_on_cmdline && !xen_initial_domain())
189 add_preferred_console("hvc", 0, NULL);
192 static int __init xen_guest_init(void)
194 struct xen_add_to_physmap xatp;
195 struct shared_info *shared_info_page = NULL;
197 phys_addr_t grant_frames;
202 if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) {
203 pr_err("Xen grant table base address not found\n");
206 grant_frames = res.start;
208 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
209 if (!xen_events_irq) {
210 pr_err("Xen event channel interrupt not found\n");
214 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
216 if (!shared_info_page) {
217 pr_err("not enough memory\n");
220 xatp.domid = DOMID_SELF;
222 xatp.space = XENMAPSPACE_shared_info;
223 xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
224 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
227 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
229 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
230 * page, we use it in the event channel upcall and in some pvclock
232 * The shared info contains exactly 1 CPU (the boot CPU). The guest
233 * is required to use VCPUOP_register_vcpu_info to place vcpu info
234 * for secondary CPUs as they are brought up.
235 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
237 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
238 sizeof(struct vcpu_info));
239 if (xen_vcpu_info == NULL)
242 if (gnttab_setup_auto_xlat_frames(grant_frames)) {
243 free_percpu(xen_vcpu_info);
247 if (!xen_initial_domain())
251 * Making sure board specific code will not set up ops for
252 * cpu idle and cpu freq.
259 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
260 "events", &xen_vcpu)) {
261 pr_err("Error request IRQ %d\n", xen_events_irq);
267 register_cpu_notifier(&xen_cpu_notifier);
271 early_initcall(xen_guest_init);
273 static int __init xen_pm_init(void)
278 pm_power_off = xen_power_off;
279 arm_pm_restart = xen_restart;
283 late_initcall(xen_pm_init);
287 void xen_arch_pre_suspend(void) { }
288 void xen_arch_post_suspend(int suspend_cancelled) { }
289 void xen_timer_resume(void) { }
290 void xen_arch_resume(void) { }
291 void xen_arch_suspend(void) { }
294 /* In the hypervisor.S file. */
295 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
296 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
297 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
298 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
299 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
300 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
301 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
302 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
303 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
304 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
305 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
306 EXPORT_SYMBOL_GPL(privcmd_call);