arch/arm/xen/enlighten.c

   1 #include <xen/xen.h>
   2 #include <xen/grant_table.h>
   3 #include <xen/hvm.h>
   4 #include <xen/interface/xen.h>
   5 #include <xen/interface/memory.h>
   6 #include <xen/interface/hvm/params.h>
   7 #include <xen/features.h>
   8 #include <xen/platform_pci.h>
   9 #include <xen/xenbus.h>
  10 #include <asm/xen/hypervisor.h>
  11 #include <asm/xen/hypercall.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/of_address.h>
  16
  17 struct start_info _xen_start_info;
  18 struct start_info *xen_start_info = &_xen_start_info;
  19 EXPORT_SYMBOL_GPL(xen_start_info);
  20
  21 enum xen_domain_type xen_domain_type = XEN_NATIVE;
  22 EXPORT_SYMBOL_GPL(xen_domain_type);
  23
  24 struct shared_info xen_dummy_shared_info;
  25 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
  26
  27 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
  28
  29 /* TODO: to be removed */
  30 __read_mostly int xen_have_vector_callback;
  31 EXPORT_SYMBOL_GPL(xen_have_vector_callback);
  32
  33 int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
  34 EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
  35
  36 int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
  37                                unsigned long addr,
  38                                unsigned long mfn, int nr,
  39                                pgprot_t prot, unsigned domid)
  40 {
  41         return -ENOSYS;
  42 }
  43 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
  44
  45 /*
  46  * see Documentation/devicetree/bindings/arm/xen.txt for the
  47  * documentation of the Xen Device Tree format.
  48  */
  49 #define GRANT_TABLE_PHYSADDR 0
  50 static int __init xen_guest_init(void)
  51 {
  52         struct xen_add_to_physmap xatp;
  53         static struct shared_info *shared_info_page = 0;
  54         struct device_node *node;
  55         int len;
  56         const char *s = NULL;
  57         const char *version = NULL;
  58         const char *xen_prefix = "xen,xen-";
  59         struct resource res;
  60
  61         node = of_find_compatible_node(NULL, NULL, "xen,xen");
  62         if (!node) {
  63                 pr_debug("No Xen support\n");
  64                 return 0;
  65         }
  66         s = of_get_property(node, "compatible", &len);
  67         if (strlen(xen_prefix) + 3  < len &&
  68                         !strncmp(xen_prefix, s, strlen(xen_prefix)))
  69                 version = s + strlen(xen_prefix);
  70         if (version == NULL) {
  71                 pr_debug("Xen version not found\n");
  72                 return 0;
  73         }
  74         if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
  75                 return 0;
  76         xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
  77         xen_domain_type = XEN_HVM_DOMAIN;
  78
  79         xen_setup_features();
  80         if (xen_feature(XENFEAT_dom0))
  81                 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
  82         else
  83                 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
  84
  85         if (!shared_info_page)
  86                 shared_info_page = (struct shared_info *)
  87                         get_zeroed_page(GFP_KERNEL);
  88         if (!shared_info_page) {
  89                 pr_err("not enough memory\n");
  90                 return -ENOMEM;
  91         }
  92         xatp.domid = DOMID_SELF;
  93         xatp.idx = 0;
  94         xatp.space = XENMAPSPACE_shared_info;
  95         xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
  96         if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
  97                 BUG();
  98
  99         HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
 100
 101         /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
 102          * page, we use it in the event channel upcall and in some pvclock
 103          * related functions. We don't need the vcpu_info placement
 104          * optimizations because we don't use any pv_mmu or pv_irq op on
 105          * HVM.
 106          * The shared info contains exactly 1 CPU (the boot CPU). The guest
 107          * is required to use VCPUOP_register_vcpu_info to place vcpu info
 108          * for secondary CPUs as they are brought up. */
 109         per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
 110
 111         gnttab_init();
 112         if (!xen_initial_domain())
 113                 xenbus_probe(NULL);
 114
 115         return 0;
 116 }
 117 core_initcall(xen_guest_init);