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 - 2018, 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 */
 50static inline void *acpi_os_allocate(acpi_size size)
 51{
 52	return kmalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
 53}
 54
 55static inline void *acpi_os_allocate_zeroed(acpi_size size)
 56{
 57	return kzalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
 58}
 59
 60static inline void acpi_os_free(void *memory)
 61{
 62	kfree(memory);
 63}
 64
 65static inline void *acpi_os_acquire_object(acpi_cache_t * cache)
 66{
 67	return kmem_cache_zalloc(cache,
 68				 irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
 69}
 70
 71static inline acpi_thread_id acpi_os_get_thread_id(void)
 72{
 73	return (acpi_thread_id) (unsigned long)current;
 74}
 75
 76/*
 77 * When lockdep is enabled, the spin_lock_init() macro stringifies it's
 78 * argument and uses that as a name for the lock in debugging.
 79 * By executing spin_lock_init() in a macro the key changes from "lock" for
 80 * all locks to the name of the argument of acpi_os_create_lock(), which
 81 * prevents lockdep from reporting false positives for ACPICA locks.
 82 */
 83#define acpi_os_create_lock(__handle) \
 84	({ \
 85		spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \
 86		if (lock) { \
 87			*(__handle) = lock; \
 88			spin_lock_init(*(__handle)); \
 89		} \
 90		lock ? AE_OK : AE_NO_MEMORY; \
 91	})
 92
 93static inline u8 acpi_os_readable(void *pointer, acpi_size length)
 94{
 95	return TRUE;
 96}
 97
 98static inline acpi_status acpi_os_initialize_debugger(void)
 99{
100	return AE_OK;
101}
102
103static inline void acpi_os_terminate_debugger(void)
104{
105	return;
106}
107
108/*
109 * OSL interfaces added by Linux
110 */
111
112#endif				/* __KERNEL__ */
113
114#endif				/* __ACLINUXEX_H__ */