138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/acpi.h>
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#include <xen/hvc-console.h>
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#include <asm/io_apic.h>
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#include <asm/hypervisor.h>
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#include <asm/e820/api.h>
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#include <asm/x86_init.h>
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#include <asm/xen/interface.h>
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#include <xen/xen.h>
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#include <xen/interface/hvm/start_info.h>
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/*
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* PVH variables.
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*
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* pvh_bootparams and pvh_start_info need to live in a data segment since
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* they are used after startup_{32|64}, which clear .bss, are invoked.
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*/
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struct boot_params __initdata pvh_bootparams;
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struct hvm_start_info __initdata pvh_start_info;
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const unsigned int __initconst pvh_start_info_sz = sizeof(pvh_start_info);
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static u64 __init pvh_get_root_pointer(void)
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{
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return pvh_start_info.rsdp_paddr;
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}
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/*
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* Xen guests are able to obtain the memory map from the hypervisor via the
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* HYPERVISOR_memory_op hypercall.
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* If we are trying to boot a Xen PVH guest, it is expected that the kernel
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* will have been configured to provide an override for this routine to do
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* just that.
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*/
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void __init __weak mem_map_via_hcall(struct boot_params *ptr __maybe_unused)
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{
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xen_raw_printk("Error: Could not find memory map\n");
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BUG();
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}
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static void __init init_pvh_bootparams(bool xen_guest)
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{
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if ((pvh_start_info.version > 0) && (pvh_start_info.memmap_entries)) {
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struct hvm_memmap_table_entry *ep;
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int i;
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ep = __va(pvh_start_info.memmap_paddr);
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pvh_bootparams.e820_entries = pvh_start_info.memmap_entries;
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for (i = 0; i < pvh_bootparams.e820_entries ; i++, ep++) {
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pvh_bootparams.e820_table[i].addr = ep->addr;
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pvh_bootparams.e820_table[i].size = ep->size;
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pvh_bootparams.e820_table[i].type = ep->type;
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}
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} else if (xen_guest) {
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mem_map_via_hcall(&pvh_bootparams);
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} else {
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/* Non-xen guests are not supported by version 0 */
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BUG();
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}
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if (pvh_bootparams.e820_entries < E820_MAX_ENTRIES_ZEROPAGE - 1) {
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pvh_bootparams.e820_table[pvh_bootparams.e820_entries].addr =
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ISA_START_ADDRESS;
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pvh_bootparams.e820_table[pvh_bootparams.e820_entries].size =
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ISA_END_ADDRESS - ISA_START_ADDRESS;
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pvh_bootparams.e820_table[pvh_bootparams.e820_entries].type =
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E820_TYPE_RESERVED;
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pvh_bootparams.e820_entries++;
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} else
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xen_raw_printk("Warning: Can fit ISA range into e820\n");
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pvh_bootparams.hdr.cmd_line_ptr =
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pvh_start_info.cmdline_paddr;
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/* The first module is always ramdisk. */
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if (pvh_start_info.nr_modules) {
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struct hvm_modlist_entry *modaddr =
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__va(pvh_start_info.modlist_paddr);
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pvh_bootparams.hdr.ramdisk_image = modaddr->paddr;
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pvh_bootparams.hdr.ramdisk_size = modaddr->size;
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}
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/*
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* See Documentation/x86/boot.rst.
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*
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* Version 2.12 supports Xen entry point but we will use default x86/PC
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* environment (i.e. hardware_subarch 0).
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*/
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pvh_bootparams.hdr.version = (2 << 8) | 12;
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pvh_bootparams.hdr.type_of_loader = ((xen_guest ? 0x9 : 0xb) << 4) | 0;
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x86_init.acpi.get_root_pointer = pvh_get_root_pointer;
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}
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/*
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* If we are trying to boot a Xen PVH guest, it is expected that the kernel
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* will have been configured to provide the required override for this routine.
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*/
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void __init __weak xen_pvh_init(struct boot_params *boot_params)
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{
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xen_raw_printk("Error: Missing xen PVH initialization\n");
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BUG();
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}
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static void __init hypervisor_specific_init(bool xen_guest)
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{
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if (xen_guest)
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xen_pvh_init(&pvh_bootparams);
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}
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/*
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* This routine (and those that it might call) should not use
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* anything that lives in .bss since that segment will be cleared later.
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*/
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void __init xen_prepare_pvh(void)
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{
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u32 msr = xen_cpuid_base();
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bool xen_guest = !!msr;
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if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) {
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xen_raw_printk("Error: Unexpected magic value (0x%08x)\n",
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pvh_start_info.magic);
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BUG();
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}
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memset(&pvh_bootparams, 0, sizeof(pvh_bootparams));
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hypervisor_specific_init(xen_guest);
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init_pvh_bootparams(xen_guest);
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}
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