1// SPDX-License-Identifier: GPL-2.0
2#include <linux/acpi.h>
3#include <linux/export.h>
4
5#include <xen/hvc-console.h>
6
7#include <asm/io_apic.h>
8#include <asm/hypervisor.h>
9#include <asm/e820/api.h>
10
11#include <xen/xen.h>
12#include <asm/xen/interface.h>
13#include <asm/xen/hypercall.h>
14
15#include <xen/interface/memory.h>
16
17#include "xen-ops.h"
18
19/*
20 * PVH variables.
21 *
22 * The variable xen_pvh needs to live in a data segment since it is used
23 * after startup_{32|64} is invoked, which will clear the .bss segment.
24 */
25bool __ro_after_init xen_pvh;
26EXPORT_SYMBOL_GPL(xen_pvh);
27
28void __init xen_pvh_init(struct boot_params *boot_params)
29{
30 u32 msr;
31 u64 pfn;
32
33 xen_pvh = 1;
34 xen_domain_type = XEN_HVM_DOMAIN;
35 xen_start_flags = pvh_start_info.flags;
36
37 msr = cpuid_ebx(op: xen_cpuid_base() + 2);
38 pfn = __pa(hypercall_page);
39 wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
40
41 if (xen_initial_domain())
42 x86_init.oem.arch_setup = xen_add_preferred_consoles;
43 x86_init.oem.banner = xen_banner;
44
45 xen_efi_init(boot_params);
46
47 if (xen_initial_domain()) {
48 struct xen_platform_op op = {
49 .cmd = XENPF_get_dom0_console,
50 };
51 int ret = HYPERVISOR_platform_op(op: &op);
52
53 if (ret > 0)
54 xen_init_vga(&op.u.dom0_console,
55 min(ret * sizeof(char),
56 sizeof(op.u.dom0_console)),
57 &boot_params->screen_info);
58 }
59}
60
61void __init mem_map_via_hcall(struct boot_params *boot_params_p)
62{
63 struct xen_memory_map memmap;
64 int rc;
65
66 memmap.nr_entries = ARRAY_SIZE(boot_params_p->e820_table);
67 set_xen_guest_handle(memmap.buffer, boot_params_p->e820_table);
68 rc = HYPERVISOR_memory_op(XENMEM_memory_map, arg: &memmap);
69 if (rc) {
70 xen_raw_printk(fmt: "XENMEM_memory_map failed (%d)\n", rc);
71 BUG();
72 }
73 boot_params_p->e820_entries = memmap.nr_entries;
74}
75

source code of linux/arch/x86/xen/enlighten_pvh.c