LXR linux-old/include/asm-i386/hw

   1#ifndef _ASM_HW_IRQ_H
   2#define _ASM_HW_IRQ_H
   3
   4/*
   5 *      linux/include/asm/hw_irq.h
   6 *
   7 *      (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
   8 *
   9 *      moved some of the old arch/i386/kernel/irq.h to here. VY
  10 *
  11 *      IRQ/IPI changes taken from work by Thomas Radke
  12 *      <tomsoft@informatik.tu-chemnitz.de>
  13 */
  14
  15#include <linux/config.h>
  16#include <asm/atomic.h>
  17#include <asm/irq.h>
  18
  19/*
  20 * IDT vectors usable for external interrupt sources start
  21 * at 0x20:
  22 */
  23#define FIRST_EXTERNAL_VECTOR   0x20
  24
  25#define SYSCALL_VECTOR          0x80
  26
  27/*
  28 * Vectors 0x20-0x2f are used for ISA interrupts.
  29 */
  30
  31/*
  32 * Special IRQ vectors used by the SMP architecture, 0xf0-0xff
  33 *
  34 *  some of the following vectors are 'rare', they are merged
  35 *  into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
  36 *  TLB, reschedule and local APIC vectors are performance-critical.
  37 *
  38 *  Vectors 0xf0-0xfa are free (reserved for future Linux use).
  39 */
  40#define SPURIOUS_APIC_VECTOR    0xff
  41#define ERROR_APIC_VECTOR       0xfe
  42#define INVALIDATE_TLB_VECTOR   0xfd
  43#define RESCHEDULE_VECTOR       0xfc
  44#define CALL_FUNCTION_VECTOR    0xfb
  45
  46/*
  47 * Local APIC timer IRQ vector is on a different priority level,
  48 * to work around the 'lost local interrupt if more than 2 IRQ
  49 * sources per level' errata.
  50 */
  51#define LOCAL_TIMER_VECTOR      0xef
  52
  53/*
  54 * First APIC vector available to drivers: (vectors 0x30-0xee)
  55 * we start at 0x31 to spread out vectors evenly between priority
  56 * levels. (0x80 is the syscall vector)
  57 */
  58#define FIRST_DEVICE_VECTOR     0x31
  59#define FIRST_SYSTEM_VECTOR     0xef
  60
  61extern int irq_vector[NR_IRQS];
  62#define IO_APIC_VECTOR(irq)     irq_vector[irq]
  63
  64/*
  65 * Various low-level irq details needed by irq.c, process.c,
  66 * time.c, io_apic.c and smp.c
  67 *
  68 * Interrupt entry/exit code at both C and assembly level
  69 */
  70
  71extern void mask_irq(unsigned int irq);
  72extern void unmask_irq(unsigned int irq);
  73extern void disable_8259A_irq(unsigned int irq);
  74extern void enable_8259A_irq(unsigned int irq);
  75extern int i8259A_irq_pending(unsigned int irq);
  76extern void make_8259A_irq(unsigned int irq);
  77extern void init_8259A(int aeoi);
  78extern void FASTCALL(send_IPI_self(int vector));
  79extern void init_VISWS_APIC_irqs(void);
  80extern void setup_IO_APIC(void);
  81extern void disable_IO_APIC(void);
  82extern void print_IO_APIC(void);
  83extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
  84extern void send_IPI(int dest, int vector);
  85
  86extern unsigned long io_apic_irqs;
  87
  88extern atomic_t irq_err_count;
  89extern atomic_t irq_mis_count;
  90
  91extern char _stext, _etext;
  92
  93#define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))
  94
  95#define __STR(x) #x
  96#define STR(x) __STR(x)
  97
  98#define SAVE_ALL \
  99        "cld\n\t" \
 100        "pushl %es\n\t" \
 101        "pushl %ds\n\t" \
 102        "pushl %eax\n\t" \
 103        "pushl %ebp\n\t" \
 104        "pushl %edi\n\t" \
 105        "pushl %esi\n\t" \
 106        "pushl %edx\n\t" \
 107        "pushl %ecx\n\t" \
 108        "pushl %ebx\n\t" \
 109        "movl $" STR(__KERNEL_DS) ",%edx\n\t" \
 110        "movl %edx,%ds\n\t" \
 111        "movl %edx,%es\n\t"
 112
 113#define IRQ_NAME2(nr) nr##_interrupt(void)
 114#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
 115
 116#define GET_CURRENT \
 117        "movl %esp, %ebx\n\t" \
 118        "andl $-8192, %ebx\n\t"
 119
 120/*
 121 *      SMP has a few special interrupts for IPI messages
 122 */
 123
 124        /* there is a second layer of macro just to get the symbolic
 125           name for the vector evaluated. This change is for RTLinux */
 126#define BUILD_SMP_INTERRUPT(x,v) XBUILD_SMP_INTERRUPT(x,v)
 127#define XBUILD_SMP_INTERRUPT(x,v)\
 128asmlinkage void x(void); \
 129asmlinkage void call_##x(void); \
 130__asm__( \
 131"\n"__ALIGN_STR"\n" \
 132SYMBOL_NAME_STR(x) ":\n\t" \
 133        "pushl $"#v"-256\n\t" \
 134        SAVE_ALL \
 135        SYMBOL_NAME_STR(call_##x)":\n\t" \
 136        "call "SYMBOL_NAME_STR(smp_##x)"\n\t" \
 137        "jmp ret_from_intr\n");
 138
 139#define BUILD_SMP_TIMER_INTERRUPT(x,v) XBUILD_SMP_TIMER_INTERRUPT(x,v)
 140#define XBUILD_SMP_TIMER_INTERRUPT(x,v) \
 141asmlinkage void x(struct pt_regs * regs); \
 142asmlinkage void call_##x(void); \
 143__asm__( \
 144"\n"__ALIGN_STR"\n" \
 145SYMBOL_NAME_STR(x) ":\n\t" \
 146        "pushl $"#v"-256\n\t" \
 147        SAVE_ALL \
 148        "movl %esp,%eax\n\t" \
 149        "pushl %eax\n\t" \
 150        SYMBOL_NAME_STR(call_##x)":\n\t" \
 151        "call "SYMBOL_NAME_STR(smp_##x)"\n\t" \
 152        "addl $4,%esp\n\t" \
 153        "jmp ret_from_intr\n");
 154
 155#define BUILD_COMMON_IRQ() \
 156asmlinkage void call_do_IRQ(void); \
 157__asm__( \
 158        "\n" __ALIGN_STR"\n" \
 159        "common_interrupt:\n\t" \
 160        SAVE_ALL \
 161        SYMBOL_NAME_STR(call_do_IRQ)":\n\t" \
 162        "call " SYMBOL_NAME_STR(do_IRQ) "\n\t" \
 163        "jmp ret_from_intr\n");
 164
 165/* 
 166 * subtle. orig_eax is used by the signal code to distinct between
 167 * system calls and interrupted 'random user-space'. Thus we have
 168 * to put a negative value into orig_eax here. (the problem is that
 169 * both system calls and IRQs want to have small integer numbers in
 170 * orig_eax, and the syscall code has won the optimization conflict ;)
 171 *
 172 * Subtle as a pigs ear.  VY
 173 */
 174
 175#define BUILD_IRQ(nr) \
 176asmlinkage void IRQ_NAME(nr); \
 177__asm__( \
 178"\n"__ALIGN_STR"\n" \
 179SYMBOL_NAME_STR(IRQ) #nr "_interrupt:\n\t" \
 180        "pushl $"#nr"-256\n\t" \
 181        "jmp common_interrupt");
 182
 183extern unsigned long prof_cpu_mask;
 184extern unsigned int * prof_buffer;
 185extern unsigned long prof_len;
 186extern unsigned long prof_shift;
 187
 188/*
 189 * x86 profiling function, SMP safe. We might want to do this in
 190 * assembly totally?
 191 */
 192static inline void x86_do_profile (unsigned long eip)
 193{
 194        if (!prof_buffer)
 195                return;
 196
 197        /*
 198         * Only measure the CPUs specified by /proc/irq/prof_cpu_mask.
 199         * (default is all CPUs.)
 200         */
 201        if (!((1<<smp_processor_id()) & prof_cpu_mask))
 202                return;
 203
 204        eip -= (unsigned long) &_stext;
 205        eip >>= prof_shift;
 206        /*
 207         * Don't ignore out-of-bounds EIP values silently,
 208         * put them into the last histogram slot, so if
 209         * present, they will show up as a sharp peak.
 210         */
 211        if (eip > prof_len-1)
 212                eip = prof_len-1;
 213        atomic_inc((atomic_t *)&prof_buffer[eip]);
 214}
 215
 216#ifdef CONFIG_SMP /*more of this file should probably be ifdefed SMP */
 217static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {
 218        if (IO_APIC_IRQ(i))
 219                send_IPI_self(IO_APIC_VECTOR(i));
 220}
 221#else
 222static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
 223#endif
 224
 225#endif /* _ASM_HW_IRQ_H */
 226