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c7341d6a DK |
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 | ||
342cd340 | 18 | #include <linux/bitops.h> |
c7341d6a DK |
19 | #include <linux/efi.h> |
20 | #include <linux/init.h> | |
21 | #include <linux/string.h> | |
22 | ||
a62ed500 | 23 | #include <xen/xen.h> |
c7341d6a | 24 | #include <xen/xen-ops.h> |
a62ed500 | 25 | #include <xen/interface/platform.h> |
c7341d6a | 26 | |
342cd340 | 27 | #include <asm/page.h> |
c7341d6a | 28 | #include <asm/setup.h> |
a62ed500 SZ |
29 | #include <asm/xen/hypercall.h> |
30 | ||
31 | static efi_char16_t vendor[100] __initdata; | |
32 | ||
33 | static 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 | ||
57 | static 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 | ||
89 | static 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 | } | |
c7341d6a DK |
138 | |
139 | void __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 | } |