mirror of https://gitee.com/openkylin/linux.git
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
#include <xen/xen.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/memory.h>
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#include <xen/platform_pci.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypercall.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/of_address.h>
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struct start_info _xen_start_info;
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struct start_info *xen_start_info = &_xen_start_info;
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EXPORT_SYMBOL_GPL(xen_start_info);
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enum xen_domain_type xen_domain_type = XEN_NATIVE;
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EXPORT_SYMBOL_GPL(xen_domain_type);
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struct shared_info xen_dummy_shared_info;
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struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
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DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
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/* TODO: to be removed */
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__read_mostly int xen_have_vector_callback;
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EXPORT_SYMBOL_GPL(xen_have_vector_callback);
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int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
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EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
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int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
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unsigned long addr,
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unsigned long mfn, int nr,
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pgprot_t prot, unsigned domid)
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{
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return -ENOSYS;
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}
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EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
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/*
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* see Documentation/devicetree/bindings/arm/xen.txt for the
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* documentation of the Xen Device Tree format.
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*/
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static int __init xen_guest_init(void)
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{
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struct xen_add_to_physmap xatp;
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static struct shared_info *shared_info_page = 0;
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struct device_node *node;
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int len;
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const char *s = NULL;
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const char *version = NULL;
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const char *xen_prefix = "xen,xen-";
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node = of_find_compatible_node(NULL, NULL, "xen,xen");
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if (!node) {
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pr_debug("No Xen support\n");
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return 0;
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}
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s = of_get_property(node, "compatible", &len);
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if (strlen(xen_prefix) + 3 < len &&
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!strncmp(xen_prefix, s, strlen(xen_prefix)))
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version = s + strlen(xen_prefix);
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if (version == NULL) {
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pr_debug("Xen version not found\n");
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return 0;
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}
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xen_domain_type = XEN_HVM_DOMAIN;
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if (!shared_info_page)
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shared_info_page = (struct shared_info *)
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get_zeroed_page(GFP_KERNEL);
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if (!shared_info_page) {
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pr_err("not enough memory\n");
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return -ENOMEM;
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}
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xatp.domid = DOMID_SELF;
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xatp.idx = 0;
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xatp.space = XENMAPSPACE_shared_info;
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xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
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if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
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BUG();
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HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
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/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
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* page, we use it in the event channel upcall and in some pvclock
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* related functions. We don't need the vcpu_info placement
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* optimizations because we don't use any pv_mmu or pv_irq op on
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* HVM.
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* The shared info contains exactly 1 CPU (the boot CPU). The guest
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* is required to use VCPUOP_register_vcpu_info to place vcpu info
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* for secondary CPUs as they are brought up. */
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per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
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return 0;
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}
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core_initcall(xen_guest_init);
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