1/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
  2/******************************************************************************
  3 *
  4 * Name: aclinuxex.h - Extra OS specific defines, etc. for Linux
  5 *
  6 * Copyright (C) 2000 - 2023, Intel Corp.
  7 *
  8 *****************************************************************************/
  9
 10#ifndef __ACLINUXEX_H__
 11#define __ACLINUXEX_H__
 12
 13#ifdef __KERNEL__
 14
 15#ifndef ACPI_USE_NATIVE_DIVIDE
 16
 17#ifndef ACPI_DIV_64_BY_32
 18#define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \
 19	do { \
 20		u64 (__n) = ((u64) n_hi) << 32 | (n_lo); \
 21		(r32) = do_div ((__n), (d32)); \
 22		(q32) = (u32) (__n); \
 23	} while (0)
 24#endif
 25
 26#ifndef ACPI_SHIFT_RIGHT_64
 27#define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \
 28	do { \
 29		(n_lo) >>= 1; \
 30		(n_lo) |= (((n_hi) & 1) << 31); \
 31		(n_hi) >>= 1; \
 32	} while (0)
 33#endif
 34
 35#endif
 36
 37/*
 38 * Overrides for in-kernel ACPICA
 39 */
 40acpi_status ACPI_INIT_FUNCTION acpi_os_initialize(void);
 41
 42acpi_status acpi_os_terminate(void);
 43
 44/*
 45 * The irqs_disabled() check is for resume from RAM.
 46 * Interrupts are off during resume, just like they are for boot.
 47 * However, boot has  (system_state != SYSTEM_RUNNING)
 48 * to quiet __might_sleep() in kmalloc() and resume does not.
 49 *
 50 * These specialized allocators have to be macros for their allocations to be
 51 * accounted separately (to have separate alloc_tag).
 52 */
 53#define acpi_os_allocate(_size)	\
 54		kmalloc(_size, irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL)
 55
 56#define acpi_os_allocate_zeroed(_size)	\
 57		kzalloc(_size, irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL)
 58
 59#define acpi_os_acquire_object(_cache)	\
 60		kmem_cache_zalloc(_cache, irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL)
 61
 62static inline void acpi_os_free(void *memory)
 63{
 64	kfree(memory);
 65}
 66
 67static inline acpi_thread_id acpi_os_get_thread_id(void)
 68{
 69	return (acpi_thread_id) (unsigned long)current;
 70}
 71
 72/*
 73 * When lockdep is enabled, the spin_lock_init() macro stringifies it's
 74 * argument and uses that as a name for the lock in debugging.
 75 * By executing spin_lock_init() in a macro the key changes from "lock" for
 76 * all locks to the name of the argument of acpi_os_create_lock(), which
 77 * prevents lockdep from reporting false positives for ACPICA locks.
 78 */
 79#define acpi_os_create_lock(__handle) \
 80	({ \
 81		spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \
 82		if (lock) { \
 83			*(__handle) = lock; \
 84			spin_lock_init(*(__handle)); \
 85		} \
 86		lock ? AE_OK : AE_NO_MEMORY; \
 87	})
 88
 89
 90#define acpi_os_create_raw_lock(__handle) \
 91	({ \
 92		raw_spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \
 93		if (lock) { \
 94			*(__handle) = lock; \
 95			raw_spin_lock_init(*(__handle)); \
 96		} \
 97		lock ? AE_OK : AE_NO_MEMORY; \
 98	})
 99
100static inline acpi_cpu_flags acpi_os_acquire_raw_lock(acpi_raw_spinlock lockp)
101{
102	acpi_cpu_flags flags;
103
104	raw_spin_lock_irqsave(lockp, flags);
105	return flags;
106}
107
108static inline void acpi_os_release_raw_lock(acpi_raw_spinlock lockp,
109					    acpi_cpu_flags flags)
110{
111	raw_spin_unlock_irqrestore(lockp, flags);
112}
113
114static inline void acpi_os_delete_raw_lock(acpi_raw_spinlock handle)
115{
116	ACPI_FREE(handle);
117}
118
119static inline u8 acpi_os_readable(void *pointer, acpi_size length)
120{
121	return TRUE;
122}
123
124static inline acpi_status acpi_os_initialize_debugger(void)
125{
126	return AE_OK;
127}
128
129static inline void acpi_os_terminate_debugger(void)
130{
131	return;
132}
133
134/*
135 * OSL interfaces added by Linux
136 */
137
138#endif				/* __KERNEL__ */
139
140#endif				/* __ACLINUXEX_H__ */