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gerrit-public.fairphone.software / kernel / msm-5.4 / 022ee6c558fc933679e151f00f84332974147fa2 / . / drivers / firmware / efi / runtime-wrappers.c
blob: 10daa4bbb25833321ffa15ed72e11b327100aa3c [file] [log] [blame]
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +0200[diff] [blame^]1/*
2 * runtime-wrappers.c - Runtime Services function call wrappers
3 *
4 * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
5 *
6 * Split off from arch/x86/platform/efi/efi.c
7 *
8 * Copyright (C) 1999 VA Linux Systems
9 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
10 * Copyright (C) 1999-2002 Hewlett-Packard Co.
11 * Copyright (C) 2005-2008 Intel Co.
12 * Copyright (C) 2013 SuSE Labs
13 *
14 * This file is released under the GPLv2.
15 */
16
17#include <linux/efi.h>
18#include <linux/spinlock.h> /* spinlock_t */
19#include <asm/efi.h>
20
21/*
22 * As per commit ef68c8f87ed1 ("x86: Serialize EFI time accesses on rtc_lock"),
23 * the EFI specification requires that callers of the time related runtime
24 * functions serialize with other CMOS accesses in the kernel, as the EFI time
25 * functions may choose to also use the legacy CMOS RTC.
26 */
27__weak DEFINE_SPINLOCK(rtc_lock);
28
29static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
30{
31 unsigned long flags;
32 efi_status_t status;
33
34 spin_lock_irqsave(&rtc_lock, flags);
35 status = efi_call_virt(get_time, tm, tc);
36 spin_unlock_irqrestore(&rtc_lock, flags);
37 return status;
38}
39
40static efi_status_t virt_efi_set_time(efi_time_t *tm)
41{
42 unsigned long flags;
43 efi_status_t status;
44
45 spin_lock_irqsave(&rtc_lock, flags);
46 status = efi_call_virt(set_time, tm);
47 spin_unlock_irqrestore(&rtc_lock, flags);
48 return status;
49}
50
51static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
52 efi_bool_t *pending,
53 efi_time_t *tm)
54{
55 unsigned long flags;
56 efi_status_t status;
57
58 spin_lock_irqsave(&rtc_lock, flags);
59 status = efi_call_virt(get_wakeup_time, enabled, pending, tm);
60 spin_unlock_irqrestore(&rtc_lock, flags);
61 return status;
62}
63
64static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
65{
66 unsigned long flags;
67 efi_status_t status;
68
69 spin_lock_irqsave(&rtc_lock, flags);
70 status = efi_call_virt(set_wakeup_time, enabled, tm);
71 spin_unlock_irqrestore(&rtc_lock, flags);
72 return status;
73}
74
75static efi_status_t virt_efi_get_variable(efi_char16_t *name,
76 efi_guid_t *vendor,
77 u32 *attr,
78 unsigned long *data_size,
79 void *data)
80{
81 return efi_call_virt(get_variable, name, vendor, attr, data_size, data);
82}
83
84static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
85 efi_char16_t *name,
86 efi_guid_t *vendor)
87{
88 return efi_call_virt(get_next_variable, name_size, name, vendor);
89}
90
91static efi_status_t virt_efi_set_variable(efi_char16_t *name,
92 efi_guid_t *vendor,
93 u32 attr,
94 unsigned long data_size,
95 void *data)
96{
97 return efi_call_virt(set_variable, name, vendor, attr, data_size, data);
98}
99
100static efi_status_t virt_efi_query_variable_info(u32 attr,
101 u64 *storage_space,
102 u64 *remaining_space,
103 u64 *max_variable_size)
104{
105 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
106 return EFI_UNSUPPORTED;
107
108 return efi_call_virt(query_variable_info, attr, storage_space,
109 remaining_space, max_variable_size);
110}
111
112static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
113{
114 return efi_call_virt(get_next_high_mono_count, count);
115}
116
117static void virt_efi_reset_system(int reset_type,
118 efi_status_t status,
119 unsigned long data_size,
120 efi_char16_t *data)
121{
122 __efi_call_virt(reset_system, reset_type, status, data_size, data);
123}
124
125static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
126 unsigned long count,
127 unsigned long sg_list)
128{
129 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
130 return EFI_UNSUPPORTED;
131
132 return efi_call_virt(update_capsule, capsules, count, sg_list);
133}
134
135static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
136 unsigned long count,
137 u64 *max_size,
138 int *reset_type)
139{
140 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
141 return EFI_UNSUPPORTED;
142
143 return efi_call_virt(query_capsule_caps, capsules, count, max_size,
144 reset_type);
145}
146
147void efi_native_runtime_setup(void)
148{
149 efi.get_time = virt_efi_get_time;
150 efi.set_time = virt_efi_set_time;
151 efi.get_wakeup_time = virt_efi_get_wakeup_time;
152 efi.set_wakeup_time = virt_efi_set_wakeup_time;
153 efi.get_variable = virt_efi_get_variable;
154 efi.get_next_variable = virt_efi_get_next_variable;
155 efi.set_variable = virt_efi_set_variable;
156 efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
157 efi.reset_system = virt_efi_reset_system;
158 efi.query_variable_info = virt_efi_query_variable_info;
159 efi.update_capsule = virt_efi_update_capsule;
160 efi.query_capsule_caps = virt_efi_query_capsule_caps;
161}