1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/acpi.h> 3 4 #include <xen/hvc-console.h> 5 6 #include <asm/io_apic.h> 7 #include <asm/hypervisor.h> 8 #include <asm/e820/api.h> 9 #include <asm/x86_init.h> 10 11 #include <asm/xen/interface.h> 12 #include <asm/xen/hypercall.h> 13 14 #include <xen/xen.h> 15 #include <xen/interface/memory.h> 16 #include <xen/interface/hvm/start_info.h> 17 18 /* 19 * PVH variables. 20 * 21 * xen_pvh pvh_bootparams and pvh_start_info need to live in data segment 22 * since they are used after startup_{32|64}, which clear .bss, are invoked. 23 */ 24 bool xen_pvh __attribute__((section(".data"))) = 0; 25 struct boot_params pvh_bootparams __attribute__((section(".data"))); 26 struct hvm_start_info pvh_start_info __attribute__((section(".data"))); 27 28 unsigned int pvh_start_info_sz = sizeof(pvh_start_info); 29 30 static u64 pvh_get_root_pointer(void) 31 { 32 return pvh_start_info.rsdp_paddr; 33 } 34 35 static void __init init_pvh_bootparams(void) 36 { 37 struct xen_memory_map memmap; 38 int rc; 39 40 memset(&pvh_bootparams, 0, sizeof(pvh_bootparams)); 41 42 memmap.nr_entries = ARRAY_SIZE(pvh_bootparams.e820_table); 43 set_xen_guest_handle(memmap.buffer, pvh_bootparams.e820_table); 44 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap); 45 if (rc) { 46 xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc); 47 BUG(); 48 } 49 pvh_bootparams.e820_entries = memmap.nr_entries; 50 51 if (pvh_bootparams.e820_entries < E820_MAX_ENTRIES_ZEROPAGE - 1) { 52 pvh_bootparams.e820_table[pvh_bootparams.e820_entries].addr = 53 ISA_START_ADDRESS; 54 pvh_bootparams.e820_table[pvh_bootparams.e820_entries].size = 55 ISA_END_ADDRESS - ISA_START_ADDRESS; 56 pvh_bootparams.e820_table[pvh_bootparams.e820_entries].type = 57 E820_TYPE_RESERVED; 58 pvh_bootparams.e820_entries++; 59 } else 60 xen_raw_printk("Warning: Can fit ISA range into e820\n"); 61 62 pvh_bootparams.hdr.cmd_line_ptr = 63 pvh_start_info.cmdline_paddr; 64 65 /* The first module is always ramdisk. */ 66 if (pvh_start_info.nr_modules) { 67 struct hvm_modlist_entry *modaddr = 68 __va(pvh_start_info.modlist_paddr); 69 pvh_bootparams.hdr.ramdisk_image = modaddr->paddr; 70 pvh_bootparams.hdr.ramdisk_size = modaddr->size; 71 } 72 73 /* 74 * See Documentation/x86/boot.txt. 75 * 76 * Version 2.12 supports Xen entry point but we will use default x86/PC 77 * environment (i.e. hardware_subarch 0). 78 */ 79 pvh_bootparams.hdr.version = (2 << 8) | 12; 80 pvh_bootparams.hdr.type_of_loader = (9 << 4) | 0; /* Xen loader */ 81 82 x86_init.acpi.get_root_pointer = pvh_get_root_pointer; 83 } 84 85 /* 86 * This routine (and those that it might call) should not use 87 * anything that lives in .bss since that segment will be cleared later. 88 */ 89 void __init xen_prepare_pvh(void) 90 { 91 u32 msr; 92 u64 pfn; 93 94 if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) { 95 xen_raw_printk("Error: Unexpected magic value (0x%08x)\n", 96 pvh_start_info.magic); 97 BUG(); 98 } 99 100 xen_pvh = 1; 101 xen_start_flags = pvh_start_info.flags; 102 103 msr = cpuid_ebx(xen_cpuid_base() + 2); 104 pfn = __pa(hypercall_page); 105 wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32)); 106 107 init_pvh_bootparams(); 108 } 109