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/interface/memory.h> 15 #include <xen/interface/hvm/start_info.h> 16 17 /* 18 * PVH variables. 19 * 20 * xen_pvh pvh_bootparams and pvh_start_info need to live in data segment 21 * since they are used after startup_{32|64}, which clear .bss, are invoked. 22 */ 23 bool xen_pvh __attribute__((section(".data"))) = 0; 24 struct boot_params pvh_bootparams __attribute__((section(".data"))); 25 struct hvm_start_info pvh_start_info __attribute__((section(".data"))); 26 27 unsigned int pvh_start_info_sz = sizeof(pvh_start_info); 28 29 static u64 pvh_get_root_pointer(void) 30 { 31 return pvh_start_info.rsdp_paddr; 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 x86_init.acpi.get_root_pointer = pvh_get_root_pointer; 82 } 83 84 /* 85 * This routine (and those that it might call) should not use 86 * anything that lives in .bss since that segment will be cleared later. 87 */ 88 void __init xen_prepare_pvh(void) 89 { 90 u32 msr; 91 u64 pfn; 92 93 if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) { 94 xen_raw_printk("Error: Unexpected magic value (0x%08x)\n", 95 pvh_start_info.magic); 96 BUG(); 97 } 98 99 xen_pvh = 1; 100 xen_start_flags = pvh_start_info.flags; 101 102 msr = cpuid_ebx(xen_cpuid_base() + 2); 103 pfn = __pa(hypercall_page); 104 wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32)); 105 106 init_pvh_bootparams(); 107 } 108