include/asm-i386/apic.h

   1 #ifndef __ASM_APIC_H
   2 #define __ASM_APIC_H
   3
   4 #include <linux/config.h>
   5 #include <asm/apicdef.h>
   6
   7 #define APIC_DEBUG 1
   8
   9 #ifdef CONFIG_X86_LOCAL_APIC
  10
  11 #if APIC_DEBUG
  12 #define Dprintk(x...) printk(##x)
  13 #else
  14 #define Dprintk(x...)
  15 #endif
  16
  17 /*
  18  * Basic functions accessing APICs.
  19  */
  20
  21 extern __inline void apic_write(unsigned long reg, unsigned long v)
  22 {
  23         *((volatile unsigned long *)(APIC_BASE+reg))=v;
  24 }
  25
  26 extern __inline unsigned long apic_read(unsigned long reg)
  27 {
  28         return *((volatile unsigned long *)(APIC_BASE+reg));
  29 }
  30
  31 extern unsigned int apic_timer_irqs [NR_CPUS];
  32
  33 #ifdef CONFIG_X86_GOOD_APIC
  34 # define FORCE_READ_AROUND_WRITE 0
  35 # define apic_readaround(x)
  36 #else
  37 # define FORCE_READ_AROUND_WRITE 1
  38 # define apic_readaround(x) apic_read(x)
  39 #endif
  40
  41 #define apic_write_around(x,y) \
  42                 do { apic_readaround(x); apic_write(x,y); } while (0)
  43
  44 extern inline void ack_APIC_irq(void)
  45 {
  46         /* Clear the IPI */
  47
  48         apic_readaround(APIC_EOI);
  49         /*
  50          * on P6+ cores (CONFIG_X86_GOOD_APIC) ack_APIC_irq() actually
  51          * gets compiled as a single instruction ... yummie.
  52          */
  53         apic_write(APIC_EOI, 0); /* Docs say use 0 for future compatibility */
  54 }
  55
  56 extern int get_maxlvt(void);
  57 extern void disable_local_APIC (void);
  58 extern void cache_APIC_registers (void);
  59 extern void setup_local_APIC (void);
  60 extern void init_apic_mappings(void);
  61 extern void smp_local_timer_interrupt(struct pt_regs * regs);
  62 extern void setup_APIC_clocks(void);
  63 #endif
  64
  65 #endif