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 */ 40 acpi_status ACPI_INIT_FUNCTION acpi_os_initialize(void); 41 42 acpi_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 static inline void *acpi_os_allocate(acpi_size size) 51 { 52 return kmalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL); 53 } 54 55 static inline void *acpi_os_allocate_zeroed(acpi_size size) 56 { 57 return kzalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL); 58 } 59 60 static inline void acpi_os_free(void *memory) 61 { 62 kfree(memory); 63 } 64 65 static 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 71 static 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 93 static inline u8 acpi_os_readable(void *pointer, acpi_size length) 94 { 95 return TRUE; 96 } 97 98 static inline acpi_status acpi_os_initialize_debugger(void) 99 { 100 return AE_OK; 101 } 102 103 static 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__ */ 115