LXR linux-old/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
  22extern __inline void apic_write(unsigned long reg, unsigned long v)
  23{
  24        *((volatile unsigned long *)(APIC_BASE+reg)) = v;
  25}
  26
  27extern __inline void apic_write_atomic(unsigned long reg, unsigned long v)
  28{
  29        xchg((volatile unsigned long *)(APIC_BASE+reg), v);
  30}
  31
  32extern __inline unsigned long apic_read(unsigned long reg)
  33{
  34        return *((volatile unsigned long *)(APIC_BASE+reg));
  35}
  36
  37static __inline__ void apic_wait_icr_idle(void)
  38{
  39        do { } while ( apic_read( APIC_ICR ) & APIC_ICR_BUSY );
  40}
  41
  42extern 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
  54extern 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
  67extern int get_maxlvt(void);
  68extern void connect_bsp_APIC (void);
  69extern void disconnect_bsp_APIC (void);
  70extern void disable_local_APIC (void);
  71extern int verify_local_APIC (void);
  72extern void cache_APIC_registers (void);
  73extern void sync_Arb_IDs(void);
  74extern void setup_local_APIC (void);
  75extern void init_apic_mappings(void);
  76extern void smp_local_timer_interrupt(struct pt_regs * regs);
  77extern void setup_APIC_clocks(void);
  78#endif
  79
  80#endif
  81