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 #include <asm/system.h>
   7
   8 #define APIC_DEBUG 1
   9
  10 #ifdef CONFIG_X86_LOCAL_APIC
  11
  12 #if APIC_DEBUG
  13 #define Dprintk(x...) printk(x)
  14 #else
  15 #define Dprintk(x...)
  16 #endif
  17
  18 /*
  19  * Basic functions accessing APICs.
  20  */
  21
  22 extern __inline void apic_write(unsigned long reg, unsigned long v)
  23 {
  24         *((volatile unsigned long *)(APIC_BASE+reg)) = v;
  25 }
  26
  27 extern __inline void apic_write_atomic(unsigned long reg, unsigned long v)
  28 {
  29         xchg((volatile unsigned long *)(APIC_BASE+reg), v);
  30 }
  31
  32 extern __inline unsigned long apic_read(unsigned long reg)
  33 {
  34         return *((volatile unsigned long *)(APIC_BASE+reg));
  35 }
  36
  37 static __inline__ void apic_wait_icr_idle(void)
  38 {
  39         do { } while ( apic_read( APIC_ICR ) & APIC_ICR_BUSY );
  40 }
  41
  42 extern unsigned int apic_timer_irqs [NR_CPUS];
  43
  44 #ifdef CONFIG_X86_GOOD_APIC
  45 # define FORCE_READ_AROUND_WRITE 0
  46 # define apic_read_around(x)
  47 # define apic_write_around(x,y) apic_write((x),(y))
  48 #else
  49 # define FORCE_READ_AROUND_WRITE 1
  50 # define apic_read_around(x) apic_read(x)
  51 # define apic_write_around(x,y) apic_write_atomic((x),(y))
  52 #endif
  53
  54 extern inline void ack_APIC_irq(void)
  55 {
  56         /*
  57          * ack_APIC_irq() actually gets compiled as a single instruction:
  58          * - a single rmw on Pentium/82489DX
  59          * - a single write on P6+ cores (CONFIG_X86_GOOD_APIC)
  60          * ... yummie.
  61          */
  62
  63         /* Docs say use 0 for future compatibility */
  64         apic_write_around(APIC_EOI, 0);
  65 }
  66
  67 extern int get_maxlvt(void);
  68 extern void connect_bsp_APIC (void);
  69 extern void disconnect_bsp_APIC (void);
  70 extern void disable_local_APIC (void);
  71 extern int verify_local_APIC (void);
  72 extern void cache_APIC_registers (void);
  73 extern void sync_Arb_IDs(void);
  74 extern void setup_local_APIC (void);
  75 extern void init_apic_mappings(void);
  76 extern void smp_local_timer_interrupt(struct pt_regs * regs);
  77 extern void setup_APIC_clocks(void);
  78 #endif
  79
  80 #endif