1 #include <linux/acpi.h> 2 3 #include <xen/hvc-console.h> 4 5 #include <asm/io_apic.h> 6 #include <asm/hypervisor.h> 7 #include <asm/e820/api.h> 8 9 #include <asm/xen/interface.h> 10 #include <asm/xen/hypercall.h> 11 12 #include <xen/interface/memory.h> 13 #include <xen/interface/hvm/start_info.h> 14 15 /* 16 * PVH variables. 17 * 18 * xen_pvh and pvh_bootparams need to live in data segment since they 19 * are used after startup_{32|64}, which clear .bss, are invoked. 20 */ 21 bool xen_pvh __attribute__((section(".data"))) = 0; 22 struct boot_params pvh_bootparams __attribute__((section(".data"))); 23 24 struct hvm_start_info pvh_start_info; 25 unsigned int pvh_start_info_sz = sizeof(pvh_start_info); 26 27 static void xen_pvh_arch_setup(void) 28 { 29 /* Make sure we don't fall back to (default) ACPI_IRQ_MODEL_PIC. */ 30 if (nr_ioapics == 0) 31 acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM; 32 } 33 34 static void __init init_pvh_bootparams(void) 35 { 36 struct xen_memory_map memmap; 37 int rc; 38 39 memset(&pvh_bootparams, 0, sizeof(pvh_bootparams)); 40 41 memmap.nr_entries = ARRAY_SIZE(pvh_bootparams.e820_table); 42 set_xen_guest_handle(memmap.buffer, pvh_bootparams.e820_table); 43 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap); 44 if (rc) { 45 xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc); 46 BUG(); 47 } 48 pvh_bootparams.e820_entries = memmap.nr_entries; 49 50 if (pvh_bootparams.e820_entries < E820_MAX_ENTRIES_ZEROPAGE - 1) { 51 pvh_bootparams.e820_table[pvh_bootparams.e820_entries].addr = 52 ISA_START_ADDRESS; 53 pvh_bootparams.e820_table[pvh_bootparams.e820_entries].size = 54 ISA_END_ADDRESS - ISA_START_ADDRESS; 55 pvh_bootparams.e820_table[pvh_bootparams.e820_entries].type = 56 E820_TYPE_RESERVED; 57 pvh_bootparams.e820_entries++; 58 } else 59 xen_raw_printk("Warning: Can fit ISA range into e820\n"); 60 61 pvh_bootparams.hdr.cmd_line_ptr = 62 pvh_start_info.cmdline_paddr; 63 64 /* The first module is always ramdisk. */ 65 if (pvh_start_info.nr_modules) { 66 struct hvm_modlist_entry *modaddr = 67 __va(pvh_start_info.modlist_paddr); 68 pvh_bootparams.hdr.ramdisk_image = modaddr->paddr; 69 pvh_bootparams.hdr.ramdisk_size = modaddr->size; 70 } 71 72 /* 73 * See Documentation/x86/boot.txt. 74 * 75 * Version 2.12 supports Xen entry point but we will use default x86/PC 76 * environment (i.e. hardware_subarch 0). 77 */ 78 pvh_bootparams.hdr.version = 0x212; 79 pvh_bootparams.hdr.type_of_loader = (9 << 4) | 0; /* Xen loader */ 80 } 81 82 /* 83 * This routine (and those that it might call) should not use 84 * anything that lives in .bss since that segment will be cleared later. 85 */ 86 void __init xen_prepare_pvh(void) 87 { 88 u32 msr; 89 u64 pfn; 90 91 if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) { 92 xen_raw_printk("Error: Unexpected magic value (0x%08x)\n", 93 pvh_start_info.magic); 94 BUG(); 95 } 96 97 xen_pvh = 1; 98 99 msr = cpuid_ebx(xen_cpuid_base() + 2); 100 pfn = __pa(hypercall_page); 101 wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32)); 102 103 init_pvh_bootparams(); 104 105 x86_init.oem.arch_setup = xen_pvh_arch_setup; 106 } 107