include/asm-i386/irq.h

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 1 #ifndef _ASM_IRQ_H
 2 #define _ASM_IRQ_H
 3
 4 /*
 5  * linux/include/asm/irq.h
 6  *
 7  * (C) 1992, 1993 Linus Torvalds
 8  *
 9  * IRQ/IPI changes taken from work by Thomas Radke <tomsoft@informatik.tu-chemnitz.de>
 10  */
 11
 12 #include <linux/linkage.h>
 13 #include <asm/segment.h>
 14
 15 #define NR_IRQS 16
 16
 17 #define TIMER_IRQ 0
 18
 19 externvoiddisable_irq(unsigned int);
 20 externvoidenable_irq(unsigned int);
 21
 22 #define __STR(x) #x
 23 #define STR(x) __STR(x)
 24
 25
 26 #define SAVE_ALL \
 27 "cld\n\t" \
 28 "push %es\n\t" \
 29 "push %ds\n\t" \
 30 "pushl %eax\n\t" \
 31 "pushl %ebp\n\t" \
 32 "pushl %edi\n\t" \
 33 "pushl %esi\n\t" \
 34 "pushl %edx\n\t" \
 35 "pushl %ecx\n\t" \
 36 "pushl %ebx\n\t" \
 37 "movl $" STR(KERNEL_DS)",%edx\n\t" \
 38 "mov %dx,%ds\n\t" \
 39 "mov %dx,%es\n\t"
 40
 41 /*
 42  * SAVE_MOST/RESTORE_MOST is used for the faster version of IRQ handlers,
 43  * installed by using the SA_INTERRUPT flag. These kinds of IRQ's don't
 44  * call the routines that do signal handling etc on return, and can have
 45  * more relaxed register-saving etc. They are also atomic, and are thus
 46  * suited for small, fast interrupts like the serial lines or the harddisk
 47  * drivers, which don't actually need signal handling etc.
 48  *
 49  * Also note that we actually save only those registers that are used in
 50  * C subroutines (%eax, %edx and %ecx), so if you do something weird,
 51  * you're on your own. The only segments that are saved (not counting the
 52  * automatic stack and code segment handling) are %ds and %es, and they
 53  * point to kernel space. No messing around with %fs here.
 54  */
 55 #define SAVE_MOST \
 56 "cld\n\t" \
 57 "push %es\n\t" \
 58 "push %ds\n\t" \
 59 "pushl %eax\n\t" \
 60 "pushl %edx\n\t" \
 61 "pushl %ecx\n\t" \
 62 "movl $" STR(KERNEL_DS)",%edx\n\t" \
 63 "mov %dx,%ds\n\t" \
 64 "mov %dx,%es\n\t"
 65
 66 #define RESTORE_MOST \
 67 "popl %ecx\n\t" \
 68 "popl %edx\n\t" \
 69 "popl %eax\n\t" \
 70 "pop %ds\n\t" \
 71 "pop %es\n\t" \
 72 "iret"
 73
 74 /*
 75  * Some fast irq handlers might want to access saved registers (mostly
 76  * cs or flags)
 77  */
 78
 79 struct fast_irq_regs {
 80 long ecx;
 81 long edx;
 82 long eax;
 83 int xds;
 84 int xes;
 85 long eip;
 86 int xcs;
 87 long eflags;
 88 long esp;
 89 int xss;
 90 };
 91
 92 /*
 93  * The "inb" instructions are not needed, but seem to change the timings
 94  * a bit - without them it seems that the harddisk driver won't work on
 95  * all hardware. Arghh.
 96  */
 97 #define ACK_FIRST(mask,nr) \
 98 "inb $0x21,%al\n\t" \
 99 "jmp 1f\n" \
 100 "1:\tjmp 1f\n" \
 101 "1:\torb $" #mask","SYMBOL_NAME_STR(cache_21)"\n\t" \
 102 "movb "SYMBOL_NAME_STR(cache_21)",%al\n\t" \
 103 "outb %al,$0x21\n\t" \
 104 "jmp 1f\n" \
 105 "1:\tjmp 1f\n" \
 106 "1:\tmovb $0x20,%al\n\t" \
 107 "outb %al,$0x20\n\t"
 108
 109 #define ACK_SECOND(mask,nr) \
 110 "inb $0xA1,%al\n\t" \
 111 "jmp 1f\n" \
 112 "1:\tjmp 1f\n" \
 113 "1:\torb $" #mask","SYMBOL_NAME_STR(cache_A1)"\n\t" \
 114 "movb "SYMBOL_NAME_STR(cache_A1)",%al\n\t" \
 115 "outb %al,$0xA1\n\t" \
 116 "jmp 1f\n" \
 117 "1:\tjmp 1f\n" \
 118 "1:\tmovb $0x20,%al\n\t" \
 119 "outb %al,$0xA0\n\t" \
 120 "jmp 1f\n" \
 121 "1:\tjmp 1f\n" \
 122 "1:\toutb %al,$0x20\n\t"
 123
 124 #define UNBLK_FIRST(mask) \
 125 "inb $0x21,%al\n\t" \
 126 "jmp 1f\n" \
 127 "1:\tjmp 1f\n" \
 128 "1:\tandb $~(" #mask"),"SYMBOL_NAME_STR(cache_21)"\n\t" \
 129 "movb "SYMBOL_NAME_STR(cache_21)",%al\n\t" \
 130 "outb %al,$0x21\n\t"
 131
 132 #define UNBLK_SECOND(mask) \
 133 "inb $0xA1,%al\n\t" \
 134 "jmp 1f\n" \
 135 "1:\tjmp 1f\n" \
 136 "1:\tandb $~(" #mask"),"SYMBOL_NAME_STR(cache_A1)"\n\t" \
 137 "movb "SYMBOL_NAME_STR(cache_A1)",%al\n\t" \
 138 "outb %al,$0xA1\n\t"
 139
 140 #define IRQ_NAME2(nr) nr##_interrupt(void)
 141 #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
 142 #define FAST_IRQ_NAME(nr) IRQ_NAME2(fast_IRQ##nr)
 143 #define BAD_IRQ_NAME(nr) IRQ_NAME2(bad_IRQ##nr)
 144
 145 #ifdef __SMP__
 146
 147 #define GET_CURRENT \
 148 "movl "SYMBOL_NAME_STR(apic_reg)", %ebx\n\t" \
 149 "movl 32(%ebx), %ebx\n\t" \
 150 "shrl $22,%ebx\n\t" \
 151 "andl $0x3C,%ebx\n\t" \
 152 "movl " SYMBOL_NAME_STR(current_set)"(,%ebx),%ebx\n\t"
 153
 154 #else
 155
 156 #define GET_CURRENT \
 157 "movl " SYMBOL_NAME_STR(current_set)",%ebx\n\t"
 158
 159 #endif
 160
 161 #ifdef __SMP__
 162
 163 /*
 164  * SMP has a few special interrupts for IPI messages
 165  */
 166
 167 #define BUILD_SMP_INTERRUPT(x) \
 168 asmlinkage void x(void); \
 169 __asm__( \
 170 "\n"__ALIGN_STR"\n" \
 171 SYMBOL_NAME_STR(x)":\n\t" \
 172 "pushl $-1\n\t" \
 173  SAVE_ALL \
 174 "call "SYMBOL_NAME_STR(smp_##x)"\n\t" \
 175 "jmp ret_from_intr\n");
 176
 177 #define BUILD_SMP_TIMER_INTERRUPT(x) \
 178 asmlinkage void x(struct pt_regs * regs); \
 179 __asm__( \
 180 "\n"__ALIGN_STR"\n" \
 181 SYMBOL_NAME_STR(x)":\n\t" \
 182 "pushl $-1\n\t" \
 183  SAVE_ALL \
 184 "movl %esp,%eax\n\t" \
 185 "pushl %eax\n\t" \
 186 "call "SYMBOL_NAME_STR(smp_##x)"\n\t" \
 187 "addl $4,%esp\n\t" \
 188 "jmp ret_from_intr\n");
 189
 190 #endif/* __SMP__ */
 191
 192 #define BUILD_IRQ(chip,nr,mask) \
 193 asmlinkage void IRQ_NAME(nr); \
 194 asmlinkage void FAST_IRQ_NAME(nr); \
 195 asmlinkage void BAD_IRQ_NAME(nr); \
 196 __asm__( \
 197 "\n"__ALIGN_STR"\n" \
 198 SYMBOL_NAME_STR(IRQ) #nr"_interrupt:\n\t" \
 199 "pushl $-"#nr"-2\n\t" \
 200  SAVE_ALL \
 201  ACK_##chip(mask,(nr&7)) \
 202 "movl %esp,%eax\n\t" \
 203 "pushl %eax\n\t" \
 204 "pushl $" #nr"\n\t" \
 205 "call "SYMBOL_NAME_STR(do_IRQ)"\n\t" \
 206 "addl $8,%esp\n\t" \
 207  UNBLK_##chip(mask) \
 208 "jmp ret_from_intr\n" \
 209 "\n"__ALIGN_STR"\n" \
 210 SYMBOL_NAME_STR(fast_IRQ) #nr"_interrupt:\n\t" \
 211  SAVE_MOST \
 212  ACK_##chip(mask,(nr&7)) \
 213 "pushl $" #nr"\n\t" \
 214 "call "SYMBOL_NAME_STR(do_fast_IRQ)"\n\t" \
 215 "addl $4,%esp\n\t" \
 216  UNBLK_##chip(mask) \
 217  RESTORE_MOST \
 218 "\n"__ALIGN_STR"\n" \
 219 SYMBOL_NAME_STR(bad_IRQ) #nr"_interrupt:\n\t" \
 220  SAVE_MOST \
 221  ACK_##chip(mask,(nr&7)) \
 222  RESTORE_MOST);
 223
 224 #define BUILD_TIMER_IRQ(chip,nr,mask) \
 225 asmlinkage void IRQ_NAME(nr); \
 226 asmlinkage void FAST_IRQ_NAME(nr); \
 227 asmlinkage void BAD_IRQ_NAME(nr); \
 228 __asm__( \
 229 "\n"__ALIGN_STR"\n" \
 230 SYMBOL_NAME_STR(fast_IRQ) #nr"_interrupt:\n\t" \
 231 SYMBOL_NAME_STR(bad_IRQ) #nr"_interrupt:\n\t" \
 232 SYMBOL_NAME_STR(IRQ) #nr"_interrupt:\n\t" \
 233 "pushl $-"#nr"-2\n\t" \
 234  SAVE_ALL \
 235  ACK_##chip(mask,(nr&7)) \
 236 "movl %esp,%eax\n\t" \
 237 "pushl %eax\n\t" \
 238 "pushl $" #nr"\n\t" \
 239 "call "SYMBOL_NAME_STR(do_IRQ)"\n\t" \
 240 "addl $8,%esp\n\t" \
 241  UNBLK_##chip(mask) \
 242 "jmp ret_from_intr\n");
 243
 244 #endif/* _ASM_IRQ_H */