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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2014 Oracle Co., Daniel Kiper
4 */
5
6#include <linux/bitops.h>
7#include <linux/efi.h>
8#include <linux/init.h>
9#include <linux/string.h>
10
11#include <xen/xen.h>
12#include <xen/xen-ops.h>
13#include <xen/interface/platform.h>
14
15#include <asm/page.h>
16#include <asm/setup.h>
17#include <asm/xen/hypercall.h>
18
19static efi_char16_t vendor[100] __initdata;
20
21static efi_system_table_t efi_systab_xen __initdata = {
22 .hdr = {
23 .signature = EFI_SYSTEM_TABLE_SIGNATURE,
24 .revision = 0, /* Initialized later. */
25 .headersize = 0, /* Ignored by Linux Kernel. */
26 .crc32 = 0, /* Ignored by Linux Kernel. */
27 .reserved = 0
28 },
29 .fw_vendor = EFI_INVALID_TABLE_ADDR, /* Initialized later. */
30 .fw_revision = 0, /* Initialized later. */
31 .con_in_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
32 .con_in = NULL, /* Not used under Xen. */
33 .con_out_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
34 .con_out = NULL, /* Not used under Xen. */
35 .stderr_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
36 .stderr = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
37 .runtime = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR,
38 /* Not used under Xen. */
39 .boottime = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR,
40 /* Not used under Xen. */
41 .nr_tables = 0, /* Initialized later. */
42 .tables = EFI_INVALID_TABLE_ADDR /* Initialized later. */
43};
44
45static efi_system_table_t __init *xen_efi_probe(void)
46{
47 struct xen_platform_op op = {
48 .cmd = XENPF_firmware_info,
49 .u.firmware_info = {
50 .type = XEN_FW_EFI_INFO,
51 .index = XEN_FW_EFI_CONFIG_TABLE
52 }
53 };
54 union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
55
56 if (!xen_initial_domain() || HYPERVISOR_platform_op(&op) < 0)
57 return NULL;
58
59 /* Here we know that Xen runs on EFI platform. */
60 xen_efi_runtime_setup();
61
62 efi_systab_xen.tables = info->cfg.addr;
63 efi_systab_xen.nr_tables = info->cfg.nent;
64
65 op.cmd = XENPF_firmware_info;
66 op.u.firmware_info.type = XEN_FW_EFI_INFO;
67 op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
68 info->vendor.bufsz = sizeof(vendor);
69 set_xen_guest_handle(info->vendor.name, vendor);
70
71 if (HYPERVISOR_platform_op(&op) == 0) {
72 efi_systab_xen.fw_vendor = __pa_symbol(vendor);
73 efi_systab_xen.fw_revision = info->vendor.revision;
74 } else
75 efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN");
76
77 op.cmd = XENPF_firmware_info;
78 op.u.firmware_info.type = XEN_FW_EFI_INFO;
79 op.u.firmware_info.index = XEN_FW_EFI_VERSION;
80
81 if (HYPERVISOR_platform_op(&op) == 0)
82 efi_systab_xen.hdr.revision = info->version;
83
84 op.cmd = XENPF_firmware_info;
85 op.u.firmware_info.type = XEN_FW_EFI_INFO;
86 op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;
87
88 if (HYPERVISOR_platform_op(&op) == 0)
89 efi.runtime_version = info->version;
90
91 return &efi_systab_xen;
92}
93
94/*
95 * Determine whether we're in secure boot mode.
96 */
97static enum efi_secureboot_mode xen_efi_get_secureboot(void)
98{
99 static efi_guid_t shim_guid = EFI_SHIM_LOCK_GUID;
100 enum efi_secureboot_mode mode;
101 efi_status_t status;
102 u8 moksbstate;
103 unsigned long size;
104
105 mode = efi_get_secureboot_mode(efi.get_variable);
106 if (mode == efi_secureboot_mode_unknown) {
107 pr_err("Could not determine UEFI Secure Boot status.\n");
108 return efi_secureboot_mode_unknown;
109 }
110 if (mode != efi_secureboot_mode_enabled)
111 return mode;
112
113 /* See if a user has put the shim into insecure mode. */
114 size = sizeof(moksbstate);
115 status = efi.get_variable(L"MokSBStateRT", &shim_guid,
116 NULL, &size, &moksbstate);
117
118 /* If it fails, we don't care why. Default to secure. */
119 if (status != EFI_SUCCESS)
120 goto secure_boot_enabled;
121
122 if (moksbstate == 1)
123 return efi_secureboot_mode_disabled;
124
125 secure_boot_enabled:
126 pr_info("UEFI Secure Boot is enabled.\n");
127 return efi_secureboot_mode_enabled;
128}
129
130void __init xen_efi_init(struct boot_params *boot_params)
131{
132 efi_system_table_t *efi_systab_xen;
133
134 efi_systab_xen = xen_efi_probe();
135
136 if (efi_systab_xen == NULL)
137 return;
138
139 strncpy((char *)&boot_params->efi_info.efi_loader_signature, "Xen",
140 sizeof(boot_params->efi_info.efi_loader_signature));
141 boot_params->efi_info.efi_systab = (__u32)__pa(efi_systab_xen);
142 boot_params->efi_info.efi_systab_hi = (__u32)(__pa(efi_systab_xen) >> 32);
143
144 boot_params->secure_boot = xen_efi_get_secureboot();
145
146 set_bit(EFI_BOOT, &efi.flags);
147 set_bit(EFI_PARAVIRT, &efi.flags);
148 set_bit(EFI_64BIT, &efi.flags);
149}
1/*
2 * Copyright (c) 2014 Oracle Co., Daniel Kiper
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include <linux/bitops.h>
19#include <linux/efi.h>
20#include <linux/init.h>
21#include <linux/string.h>
22
23#include <xen/xen.h>
24#include <xen/xen-ops.h>
25#include <xen/interface/platform.h>
26
27#include <asm/page.h>
28#include <asm/setup.h>
29#include <asm/xen/hypercall.h>
30
31static efi_char16_t vendor[100] __initdata;
32
33static efi_system_table_t efi_systab_xen __initdata = {
34 .hdr = {
35 .signature = EFI_SYSTEM_TABLE_SIGNATURE,
36 .revision = 0, /* Initialized later. */
37 .headersize = 0, /* Ignored by Linux Kernel. */
38 .crc32 = 0, /* Ignored by Linux Kernel. */
39 .reserved = 0
40 },
41 .fw_vendor = EFI_INVALID_TABLE_ADDR, /* Initialized later. */
42 .fw_revision = 0, /* Initialized later. */
43 .con_in_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
44 .con_in = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
45 .con_out_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
46 .con_out = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
47 .stderr_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
48 .stderr = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
49 .runtime = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR,
50 /* Not used under Xen. */
51 .boottime = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR,
52 /* Not used under Xen. */
53 .nr_tables = 0, /* Initialized later. */
54 .tables = EFI_INVALID_TABLE_ADDR /* Initialized later. */
55};
56
57static const struct efi efi_xen __initconst = {
58 .systab = NULL, /* Initialized later. */
59 .runtime_version = 0, /* Initialized later. */
60 .mps = EFI_INVALID_TABLE_ADDR,
61 .acpi = EFI_INVALID_TABLE_ADDR,
62 .acpi20 = EFI_INVALID_TABLE_ADDR,
63 .smbios = EFI_INVALID_TABLE_ADDR,
64 .smbios3 = EFI_INVALID_TABLE_ADDR,
65 .sal_systab = EFI_INVALID_TABLE_ADDR,
66 .boot_info = EFI_INVALID_TABLE_ADDR,
67 .hcdp = EFI_INVALID_TABLE_ADDR,
68 .uga = EFI_INVALID_TABLE_ADDR,
69 .uv_systab = EFI_INVALID_TABLE_ADDR,
70 .fw_vendor = EFI_INVALID_TABLE_ADDR,
71 .runtime = EFI_INVALID_TABLE_ADDR,
72 .config_table = EFI_INVALID_TABLE_ADDR,
73 .get_time = xen_efi_get_time,
74 .set_time = xen_efi_set_time,
75 .get_wakeup_time = xen_efi_get_wakeup_time,
76 .set_wakeup_time = xen_efi_set_wakeup_time,
77 .get_variable = xen_efi_get_variable,
78 .get_next_variable = xen_efi_get_next_variable,
79 .set_variable = xen_efi_set_variable,
80 .query_variable_info = xen_efi_query_variable_info,
81 .update_capsule = xen_efi_update_capsule,
82 .query_capsule_caps = xen_efi_query_capsule_caps,
83 .get_next_high_mono_count = xen_efi_get_next_high_mono_count,
84 .reset_system = NULL, /* Functionality provided by Xen. */
85 .set_virtual_address_map = NULL, /* Not used under Xen. */
86 .flags = 0 /* Initialized later. */
87};
88
89static efi_system_table_t __init *xen_efi_probe(void)
90{
91 struct xen_platform_op op = {
92 .cmd = XENPF_firmware_info,
93 .u.firmware_info = {
94 .type = XEN_FW_EFI_INFO,
95 .index = XEN_FW_EFI_CONFIG_TABLE
96 }
97 };
98 union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
99
100 if (!xen_initial_domain() || HYPERVISOR_platform_op(&op) < 0)
101 return NULL;
102
103 /* Here we know that Xen runs on EFI platform. */
104
105 efi = efi_xen;
106
107 efi_systab_xen.tables = info->cfg.addr;
108 efi_systab_xen.nr_tables = info->cfg.nent;
109
110 op.cmd = XENPF_firmware_info;
111 op.u.firmware_info.type = XEN_FW_EFI_INFO;
112 op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
113 info->vendor.bufsz = sizeof(vendor);
114 set_xen_guest_handle(info->vendor.name, vendor);
115
116 if (HYPERVISOR_platform_op(&op) == 0) {
117 efi_systab_xen.fw_vendor = __pa_symbol(vendor);
118 efi_systab_xen.fw_revision = info->vendor.revision;
119 } else
120 efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN");
121
122 op.cmd = XENPF_firmware_info;
123 op.u.firmware_info.type = XEN_FW_EFI_INFO;
124 op.u.firmware_info.index = XEN_FW_EFI_VERSION;
125
126 if (HYPERVISOR_platform_op(&op) == 0)
127 efi_systab_xen.hdr.revision = info->version;
128
129 op.cmd = XENPF_firmware_info;
130 op.u.firmware_info.type = XEN_FW_EFI_INFO;
131 op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;
132
133 if (HYPERVISOR_platform_op(&op) == 0)
134 efi.runtime_version = info->version;
135
136 return &efi_systab_xen;
137}
138
139void __init xen_efi_init(void)
140{
141 efi_system_table_t *efi_systab_xen;
142
143 efi_systab_xen = xen_efi_probe();
144
145 if (efi_systab_xen == NULL)
146 return;
147
148 strncpy((char *)&boot_params.efi_info.efi_loader_signature, "Xen",
149 sizeof(boot_params.efi_info.efi_loader_signature));
150 boot_params.efi_info.efi_systab = (__u32)__pa(efi_systab_xen);
151 boot_params.efi_info.efi_systab_hi = (__u32)(__pa(efi_systab_xen) >> 32);
152
153 set_bit(EFI_BOOT, &efi.flags);
154 set_bit(EFI_PARAVIRT, &efi.flags);
155 set_bit(EFI_64BIT, &efi.flags);
156}