1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * internal.h - printk internal definitions 4 */ 5 #include <linux/percpu.h> 6 7 #ifdef CONFIG_PRINTK 8 9 #define PRINTK_SAFE_CONTEXT_MASK 0x007ffffff 10 #define PRINTK_NMI_DIRECT_CONTEXT_MASK 0x008000000 11 #define PRINTK_NMI_CONTEXT_MASK 0xff0000000 12 13 #define PRINTK_NMI_CONTEXT_OFFSET 0x010000000 14 15 __printf(4, 0) 16 int vprintk_store(int facility, int level, 17 const struct dev_printk_info *dev_info, 18 const char *fmt, va_list args); 19 20 __printf(1, 0) int vprintk_default(const char *fmt, va_list args); 21 __printf(1, 0) int vprintk_deferred(const char *fmt, va_list args); 22 void __printk_safe_enter(void); 23 void __printk_safe_exit(void); 24 25 void printk_safe_init(void); 26 bool printk_percpu_data_ready(void); 27 28 #define printk_safe_enter_irqsave(flags) \ 29 do { \ 30 local_irq_save(flags); \ 31 __printk_safe_enter(); \ 32 } while (0) 33 34 #define printk_safe_exit_irqrestore(flags) \ 35 do { \ 36 __printk_safe_exit(); \ 37 local_irq_restore(flags); \ 38 } while (0) 39 40 #define printk_safe_enter_irq() \ 41 do { \ 42 local_irq_disable(); \ 43 __printk_safe_enter(); \ 44 } while (0) 45 46 #define printk_safe_exit_irq() \ 47 do { \ 48 __printk_safe_exit(); \ 49 local_irq_enable(); \ 50 } while (0) 51 52 void defer_console_output(void); 53 54 #else 55 56 /* 57 * In !PRINTK builds we still export console_sem 58 * semaphore and some of console functions (console_unlock()/etc.), so 59 * printk-safe must preserve the existing local IRQ guarantees. 60 */ 61 #define printk_safe_enter_irqsave(flags) local_irq_save(flags) 62 #define printk_safe_exit_irqrestore(flags) local_irq_restore(flags) 63 64 #define printk_safe_enter_irq() local_irq_disable() 65 #define printk_safe_exit_irq() local_irq_enable() 66 67 static inline void printk_safe_init(void) { } 68 static inline bool printk_percpu_data_ready(void) { return false; } 69 #endif /* CONFIG_PRINTK */ 70