arch/ia64/include/asm/xtp.h

   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 */