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 10 #include <asm/xen/interface.h> 11 #include <asm/xen/hypercall.h> 12 13 #include <xen/interface/memory.h> 14 #include <xen/interface/hvm/start_info.h> 15 16 /* 17 * PVH variables. 18 * 19 * xen_pvh and pvh_bootparams need to live in data segment since they 20 * are used after startup_{32|64}, which clear .bss, are invoked. 21 */ 22 bool xen_pvh __attribute__((section(".data"))) = 0; 23 struct boot_params pvh_bootparams __attribute__((section(".data"))); 24 25 struct hvm_start_info pvh_start_info; 26 unsigned int pvh_start_info_sz = sizeof(pvh_start_info); 27 28 static void xen_pvh_arch_setup(void) 29 { 30 /* Make sure we don't fall back to (default) ACPI_IRQ_MODEL_PIC. */ 31 if (nr_ioapics == 0) 32 acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM; 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 = 0x212; 80 pvh_bootparams.hdr.type_of_loader = (9 << 4) | 0; /* Xen loader */ 81 } 82 83 /* 84 * This routine (and those that it might call) should not use 85 * anything that lives in .bss since that segment will be cleared later. 86 */ 87 void __init xen_prepare_pvh(void) 88 { 89 u32 msr; 90 u64 pfn; 91 92 if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) { 93 xen_raw_printk("Error: Unexpected magic value (0x%08x)\n", 94 pvh_start_info.magic); 95 BUG(); 96 } 97 98 xen_pvh = 1; 99 100 msr = cpuid_ebx(xen_cpuid_base() + 2); 101 pfn = __pa(hypercall_page); 102 wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32)); 103 104 init_pvh_bootparams(); 105 106 x86_init.oem.arch_setup = xen_pvh_arch_setup; 107 } 108