148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
#ifndef _ASM_IRQ_H
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#define _ASM_IRQ_H
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/*
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* linux/include/asm/irq.h
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*
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* (C) 1992 Linus Torvalds
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*/
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#define SAVE_ALL \
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"cld\n\t" \
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"push %gs\n\t" \
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"push %fs\n\t" \
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"push %es\n\t" \
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"push %ds\n\t" \
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"pushl %eax\n\t" \
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"pushl %ebp\n\t" \
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"pushl %edi\n\t" \
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"pushl %esi\n\t" \
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"pushl %edx\n\t" \
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"pushl %ecx\n\t" \
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"pushl %ebx\n\t" \
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"movl $0x10,%edx\n\t" \
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"mov %dx,%ds\n\t" \
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"mov %dx,%es\n\t" \
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"movl $0x17,%edx\n\t" \
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"mov %dx,%fs\n\t"
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/*
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* SAVE_MOST/RESTORE_MOST is used for the faster version of IRQ handlers,
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* installed by using the SA_INTERRUPT flag. These kinds of IRQ's don't
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* call the routines that do signal handling etc on return, and can have
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* more relaxed register-saving etc. They are also atomic, and are thus
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* suited for small, fast interrupts like the serial lines or the harddisk
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* drivers, which don't actually need signal handling etc.
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*
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* Also note that we actually save only those registers that are used in
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* C subroutines (%eax, %edx and %ecx), so if you do something weird,
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* you're on your own. The only segments that are saved (not counting the
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* automatic stack and code segment handling) are %ds and %es, and they
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* point to kernel space. No messing around with %fs here.
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*/
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#define SAVE_MOST \
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"cld\n\t" \
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"push %es\n\t" \
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"push %ds\n\t" \
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"pushl %eax\n\t" \
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"pushl %edx\n\t" \
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"pushl %ecx\n\t" \
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"movl $0x10,%edx\n\t" \
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"mov %dx,%ds\n\t" \
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"mov %dx,%es\n\t"
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#define RESTORE_MOST \
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"popl %ecx\n\t" \
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"popl %edx\n\t" \
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"popl %eax\n\t" \
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"pop %ds\n\t" \
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"pop %es\n\t" \
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"iret"
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#define ACK_FIRST(mask) \
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"inb $0x21,%al\n\t" \
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"jmp 1f\n" \
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"1:\tjmp 1f\n" \
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"1:\torb $" #mask ",%al\n\t" \
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"outb %al,$0x21\n\t" \
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"jmp 1f\n" \
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"1:\tjmp 1f\n" \
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"1:\tmovb $0x20,%al\n\t" \
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"outb %al,$0x20\n\t"
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#define ACK_SECOND(mask) \
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"inb $0xA1,%al\n\t" \
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"jmp 1f\n" \
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"1:\tjmp 1f\n" \
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"1:\torb $" #mask ",%al\n\t" \
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"outb %al,$0xA1\n\t" \
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"jmp 1f\n" \
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"1:\tjmp 1f\n" \
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"1:\tmovb $0x20,%al\n\t" \
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"outb %al,$0xA0\n\t" \
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"jmp 1f\n" \
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"1:\tjmp 1f\n" \
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"1:\toutb %al,$0x20\n\t"
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#define UNBLK_FIRST(mask) \
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"inb $0x21,%al\n\t" \
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"jmp 1f\n" \
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"1:\tjmp 1f\n" \
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"1:\tandb $~(" #mask "),%al\n\t" \
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"outb %al,$0x21\n\t"
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#define UNBLK_SECOND(mask) \
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"inb $0xA1,%al\n\t" \
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"jmp 1f\n" \
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"1:\tjmp 1f\n" \
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"1:\tandb $~(" #mask "),%al\n\t" \
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"outb %al,$0xA1\n\t"
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#define IRQ_NAME2(nr) nr##_interrupt()
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#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
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#define FAST_IRQ_NAME(nr) IRQ_NAME2(fast_IRQ##nr)
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#define BAD_IRQ_NAME(nr) IRQ_NAME2(bad_IRQ##nr)
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#define BUILD_IRQ(chip,nr,mask) \
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void IRQ_NAME(nr); \
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void FAST_IRQ_NAME(nr); \
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void BAD_IRQ_NAME(nr); \
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__asm__( \
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"\n.align 2\n" \
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"_IRQ" #nr "_interrupt:\n\t" \
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"pushl $-"#nr"-2\n\t" \
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SAVE_ALL \
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ACK_##chip(mask) \
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"sti\n\t" \
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"movl %esp,%ebx\n\t" \
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"pushl %ebx\n\t" \
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"pushl $" #nr "\n\t" \
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"call _do_IRQ\n\t" \
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"addl $8,%esp\n\t" \
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"testl %eax,%eax\n\t" \
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"jne ret_from_sys_call\n\t" \
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"cli\n\t" \
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UNBLK_##chip(mask) \
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"jmp ret_from_sys_call\n" \
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"\n.align 2\n" \
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"_fast_IRQ" #nr "_interrupt:\n\t" \
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SAVE_MOST \
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ACK_##chip(mask) \
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"pushl $" #nr "\n\t" \
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"call _do_fast_IRQ\n\t" \
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"addl $4,%esp\n\t" \
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"testl %eax,%eax\n\t" \
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"jne 2f\n\t" \
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"cli\n\t" \
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UNBLK_##chip(mask) \
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"\n2:\t" \
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RESTORE_MOST \
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"\n\n.align 2\n" \
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"_bad_IRQ" #nr "_interrupt:\n\t" \
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"pushl %eax\n\t" \
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ACK_##chip(mask) \
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"popl %eax\n\t" \
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"iret");
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#endif
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