1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_IA64_XTP_H 3 #define _ASM_IA64_XTP_H 4 5 #include <asm/io.h> 6 7 #ifdef CONFIG_SMP 8 9 #define XTP_OFFSET 0x1e0008 10 11 #define SMP_IRQ_REDIRECTION (1 << 0) 12 #define SMP_IPI_REDIRECTION (1 << 1) 13 14 extern unsigned char smp_int_redirect; 15 16 /* 17 * XTP control functions: 18 * min_xtp : route all interrupts to this CPU 19 * normal_xtp: nominal XTP value 20 * max_xtp : never deliver interrupts to this CPU. 21 */ 22 23 static inline void 24 min_xtp (void) 25 { 26 if (smp_int_redirect & SMP_IRQ_REDIRECTION) 27 writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */ 28 } 29 30 static inline void 31 normal_xtp (void) 32 { 33 if (smp_int_redirect & SMP_IRQ_REDIRECTION) 34 writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */ 35 } 36 37 static inline void 38 max_xtp (void) 39 { 40 if (smp_int_redirect & SMP_IRQ_REDIRECTION) 41 writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */ 42 } 43 44 #endif /* CONFIG_SMP */ 45 46 #endif /* _ASM_IA64_XTP_Hy */ 47