1 /******************************************************************************
2  *
3  * Name: aclinuxex.h - Extra OS specific defines, etc. for Linux
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2016, Intel Corp.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43 
44 #ifndef __ACLINUXEX_H__
45 #define __ACLINUXEX_H__
46 
47 #ifdef __KERNEL__
48 
49 #ifndef ACPI_USE_NATIVE_DIVIDE
50 
51 #ifndef ACPI_DIV_64_BY_32
52 #define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \
53 	do { \
54 		u64 (__n) = ((u64) n_hi) << 32 | (n_lo); \
55 		(r32) = do_div ((__n), (d32)); \
56 		(q32) = (u32) (__n); \
57 	} while (0)
58 #endif
59 
60 #ifndef ACPI_SHIFT_RIGHT_64
61 #define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \
62 	do { \
63 		(n_lo) >>= 1; \
64 		(n_lo) |= (((n_hi) & 1) << 31); \
65 		(n_hi) >>= 1; \
66 	} while (0)
67 #endif
68 
69 #endif
70 
71 /*
72  * Overrides for in-kernel ACPICA
73  */
74 acpi_status __init acpi_os_initialize(void);
75 
76 acpi_status acpi_os_terminate(void);
77 
78 /*
79  * The irqs_disabled() check is for resume from RAM.
80  * Interrupts are off during resume, just like they are for boot.
81  * However, boot has  (system_state != SYSTEM_RUNNING)
82  * to quiet __might_sleep() in kmalloc() and resume does not.
83  */
84 static inline void *acpi_os_allocate(acpi_size size)
85 {
86 	return kmalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
87 }
88 
89 static inline void *acpi_os_allocate_zeroed(acpi_size size)
90 {
91 	return kzalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
92 }
93 
94 static inline void acpi_os_free(void *memory)
95 {
96 	kfree(memory);
97 }
98 
99 static inline void *acpi_os_acquire_object(acpi_cache_t * cache)
100 {
101 	return kmem_cache_zalloc(cache,
102 				 irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
103 }
104 
105 static inline acpi_thread_id acpi_os_get_thread_id(void)
106 {
107 	return (acpi_thread_id) (unsigned long)current;
108 }
109 
110 /*
111  * When lockdep is enabled, the spin_lock_init() macro stringifies it's
112  * argument and uses that as a name for the lock in debugging.
113  * By executing spin_lock_init() in a macro the key changes from "lock" for
114  * all locks to the name of the argument of acpi_os_create_lock(), which
115  * prevents lockdep from reporting false positives for ACPICA locks.
116  */
117 #define acpi_os_create_lock(__handle) \
118 	({ \
119 		spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \
120 		if (lock) { \
121 			*(__handle) = lock; \
122 			spin_lock_init(*(__handle)); \
123 		} \
124 		lock ? AE_OK : AE_NO_MEMORY; \
125 	})
126 
127 static inline u8 acpi_os_readable(void *pointer, acpi_size length)
128 {
129 	return TRUE;
130 }
131 
132 static inline acpi_status acpi_os_initialize_command_signals(void)
133 {
134 	return AE_OK;
135 }
136 
137 static inline void acpi_os_terminate_command_signals(void)
138 {
139 	return;
140 }
141 
142 /*
143  * OSL interfaces added by Linux
144  */
145 void early_acpi_os_unmap_memory(void __iomem * virt, acpi_size size);
146 
147 #endif				/* __KERNEL__ */
148 
149 #endif				/* __ACLINUXEX_H__ */
150