arch/x86/include/asm/io_bitmap.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_IOBITMAP_H
   3 #define _ASM_X86_IOBITMAP_H
   4
   5 #include <linux/refcount.h>
   6 #include <asm/processor.h>
   7
   8 struct io_bitmap {
   9         u64             sequence;
  10         refcount_t      refcnt;
  11         /* The maximum number of bytes to copy so all zero bits are covered */
  12         unsigned int    max;
  13         unsigned long   bitmap[IO_BITMAP_LONGS];
  14 };
  15
  16 struct task_struct;
  17
  18 #ifdef CONFIG_X86_IOPL_IOPERM
  19 void io_bitmap_share(struct task_struct *tsk);
  20 void io_bitmap_exit(struct task_struct *tsk);
  21
  22 void native_tss_update_io_bitmap(void);
  23
  24 #ifdef CONFIG_PARAVIRT_XXL
  25 #include <asm/paravirt.h>
  26 #else
  27 #define tss_update_io_bitmap native_tss_update_io_bitmap
  28 #endif
  29
  30 #else
  31 static inline void io_bitmap_share(struct task_struct *tsk) { }
  32 static inline void io_bitmap_exit(struct task_struct *tsk) { }
  33 static inline void tss_update_io_bitmap(void) { }
  34 #endif
  35
  36 #endif