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#ifndef _ASM_IRQ_H
#define _ASM_IRQ_H
/*
* linux/include/asm/irq.h
*
* (C) 1992, 1993 Linus Torvalds
*
* IRQ/IPI changes taken from work by Thomas Radke <tomsoft@informatik.tu-chemnitz.de>
*/
#include <linux/linkage.h>
#include <asm/segment.h>
#define NR_IRQS 16
extern void disable_irq(unsigned int);
extern void enable_irq(unsigned int);
#define __STR(x) #x
#define STR(x) __STR(x)
#define SAVE_ALL \
"cld\n\t" \
"push %gs\n\t" \
"push %fs\n\t" \
"push %es\n\t" \
"push %ds\n\t" \
"pushl %eax\n\t" \
"pushl %ebp\n\t" \
"pushl %edi\n\t" \
"pushl %esi\n\t" \
"pushl %edx\n\t" \
"pushl %ecx\n\t" \
"pushl %ebx\n\t" \
"movl $" STR(KERNEL_DS) ",%edx\n\t" \
"mov %dx,%ds\n\t" \
"mov %dx,%es\n\t" \
"movl $" STR(USER_DS) ",%edx\n\t" \
"mov %dx,%fs\n\t" \
"movl $0,%edx\n\t" \
"movl %edx,%db7\n\t"
/*
* SAVE_MOST/RESTORE_MOST is used for the faster version of IRQ handlers,
* installed by using the SA_INTERRUPT flag. These kinds of IRQ's don't
* call the routines that do signal handling etc on return, and can have
* more relaxed register-saving etc. They are also atomic, and are thus
* suited for small, fast interrupts like the serial lines or the harddisk
* drivers, which don't actually need signal handling etc.
*
* Also note that we actually save only those registers that are used in
* C subroutines (%eax, %edx and %ecx), so if you do something weird,
* you're on your own. The only segments that are saved (not counting the
* automatic stack and code segment handling) are %ds and %es, and they
* point to kernel space. No messing around with %fs here.
*/
#define SAVE_MOST \
"cld\n\t" \
"push %es\n\t" \
"push %ds\n\t" \
"pushl %eax\n\t" \
"pushl %edx\n\t" \
"pushl %ecx\n\t" \
"movl $" STR(KERNEL_DS) ",%edx\n\t" \
"mov %dx,%ds\n\t" \
"mov %dx,%es\n\t"
#define RESTORE_MOST \
"popl %ecx\n\t" \
"popl %edx\n\t" \
"popl %eax\n\t" \
"pop %ds\n\t" \
"pop %es\n\t" \
"iret"
/*
* The "inb" instructions are not needed, but seem to change the timings
* a bit - without them it seems that the harddisk driver won't work on
* all hardware. Arghh.
*/
#define ACK_FIRST(mask) \
"inb $0x21,%al\n\t" \
"jmp 1f\n" \
"1:\tjmp 1f\n" \
"1:\torb $" #mask ","SYMBOL_NAME_STR(cache_21)"\n\t" \
"movb "SYMBOL_NAME_STR(cache_21)",%al\n\t" \
"outb %al,$0x21\n\t" \
"jmp 1f\n" \
"1:\tjmp 1f\n" \
"1:\tmovb $0x20,%al\n\t" \
"outb %al,$0x20\n\t"
#define ACK_SECOND(mask) \
"inb $0xA1,%al\n\t" \
"jmp 1f\n" \
"1:\tjmp 1f\n" \
"1:\torb $" #mask ","SYMBOL_NAME_STR(cache_A1)"\n\t" \
"movb "SYMBOL_NAME_STR(cache_A1)",%al\n\t" \
"outb %al,$0xA1\n\t" \
"jmp 1f\n" \
"1:\tjmp 1f\n" \
"1:\tmovb $0x20,%al\n\t" \
"outb %al,$0xA0\n\t" \
"jmp 1f\n" \
"1:\tjmp 1f\n" \
"1:\toutb %al,$0x20\n\t"
#define UNBLK_FIRST(mask) \
"inb $0x21,%al\n\t" \
"jmp 1f\n" \
"1:\tjmp 1f\n" \
"1:\tandb $~(" #mask "),"SYMBOL_NAME_STR(cache_21)"\n\t" \
"movb "SYMBOL_NAME_STR(cache_21)",%al\n\t" \
"outb %al,$0x21\n\t"
#define UNBLK_SECOND(mask) \
"inb $0xA1,%al\n\t" \
"jmp 1f\n" \
"1:\tjmp 1f\n" \
"1:\tandb $~(" #mask "),"SYMBOL_NAME_STR(cache_A1)"\n\t" \
"movb "SYMBOL_NAME_STR(cache_A1)",%al\n\t" \
"outb %al,$0xA1\n\t"
#define IRQ_NAME2(nr) nr##_interrupt(void)
#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
#define FAST_IRQ_NAME(nr) IRQ_NAME2(fast_IRQ##nr)
#define BAD_IRQ_NAME(nr) IRQ_NAME2(bad_IRQ##nr)
#ifdef __SMP__
#ifndef __SMP_PROF__
#define SMP_PROF_INT_SPINS
#define SMP_PROF_IPI_CNT
#else
#define SMP_PROF_INT_SPINS "incl "SYMBOL_NAME_STR(smp_spins)"(,%eax,4)\n\t"
#define SMP_PROF_IPI_CNT "incl "SYMBOL_NAME_STR(ipi_count)"\n\t"
#endif
#define GET_PROCESSOR_ID \
"movl "SYMBOL_NAME_STR(apic_reg)", %edx\n\t" \
"movl 32(%edx), %eax\n\t" \
"shrl $24,%eax\n\t" \
"andb $0x0F,%al\n"
#define ENTER_KERNEL \
"pushl %eax\n\t" \
"pushl %edx\n\t" \
"pushfl\n\t" \
"cli\n\t" \
GET_PROCESSOR_ID \
"1: " \
"lock\n\t" \
"btsl $0, "SYMBOL_NAME_STR(kernel_flag)"\n\t" \
"jnc 3f\n\t" \
"cmpb "SYMBOL_NAME_STR(active_kernel_processor)", %al\n\t" \
"je 4f\n\t" \
"2: " \
SMP_PROF_INT_SPINS \
"btl %al, "SYMBOL_NAME_STR(smp_invalidate_needed)"\n\t" \
"jnc 5f\n\t" \
"lock\n\t" \
"btrl %al, "SYMBOL_NAME_STR(smp_invalidate_needed)"\n\t" \
"jnc 5f\n\t" \
"movl %cr3,%edx\n\t" \
"movl %edx,%cr3\n" \
"5: btl $0, "SYMBOL_NAME_STR(kernel_flag)"\n\t" \
"jc 2b\n\t" \
"jmp 1b\n\t" \
"3: " \
"movb %al, "SYMBOL_NAME_STR(active_kernel_processor)"\n\t" \
"4: " \
"incl "SYMBOL_NAME_STR(kernel_counter)"\n\t" \
"popfl\n\t" \
"popl %edx\n\t" \
"popl %eax\n\t"
#define LEAVE_KERNEL \
"pushfl\n\t" \
"cli\n\t" \
"decl "SYMBOL_NAME_STR(kernel_counter)"\n\t" \
"jnz 1f\n\t" \
"movb $" STR (NO_PROC_ID) ", "SYMBOL_NAME_STR(active_kernel_processor)"\n\t" \
"lock\n\t" \
"btrl $0, "SYMBOL_NAME_STR(kernel_flag)"\n\t" \
"1: " \
"popfl\n\t"
/*
* the syscall count inc is a gross hack because ret_from_syscall is used by both irq and
* syscall return paths (urghh).
*/
#define BUILD_IRQ(chip,nr,mask) \
asmlinkage void IRQ_NAME(nr); \
asmlinkage void FAST_IRQ_NAME(nr); \
asmlinkage void BAD_IRQ_NAME(nr); \
__asm__( \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(IRQ) #nr "_interrupt:\n\t" \
"pushl $-"#nr"-2\n\t" \
SAVE_ALL \
ENTER_KERNEL \
ACK_##chip(mask) \
"incl "SYMBOL_NAME_STR(intr_count)"\n\t"\
"sti\n\t" \
"movl %esp,%ebx\n\t" \
"pushl %ebx\n\t" \
"pushl $" #nr "\n\t" \
"call "SYMBOL_NAME_STR(do_IRQ)"\n\t" \
"addl $8,%esp\n\t" \
"cli\n\t" \
UNBLK_##chip(mask) \
"decl "SYMBOL_NAME_STR(intr_count)"\n\t" \
"incl "SYMBOL_NAME_STR(syscall_count)"\n\t" \
"jmp ret_from_sys_call\n" \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(fast_IRQ) #nr "_interrupt:\n\t" \
SAVE_MOST \
ENTER_KERNEL \
ACK_##chip(mask) \
"incl "SYMBOL_NAME_STR(intr_count)"\n\t" \
"pushl $" #nr "\n\t" \
"call "SYMBOL_NAME_STR(do_fast_IRQ)"\n\t" \
"addl $4,%esp\n\t" \
"cli\n\t" \
UNBLK_##chip(mask) \
"decl "SYMBOL_NAME_STR(intr_count)"\n\t" \
LEAVE_KERNEL \
RESTORE_MOST \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(bad_IRQ) #nr "_interrupt:\n\t" \
SAVE_MOST \
ENTER_KERNEL \
ACK_##chip(mask) \
LEAVE_KERNEL \
RESTORE_MOST);
/*
* Message pass must be a fast IRQ..
*/
#define BUILD_MSGIRQ(chip,nr,mask) \
asmlinkage void IRQ_NAME(nr); \
asmlinkage void FAST_IRQ_NAME(nr); \
asmlinkage void BAD_IRQ_NAME(nr); \
__asm__( \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(IRQ) #nr "_interrupt:\n\t" \
"pushl $-"#nr"-2\n\t" \
SAVE_ALL \
ENTER_KERNEL \
ACK_##chip(mask) \
"incl "SYMBOL_NAME_STR(intr_count)"\n\t"\
"sti\n\t" \
"movl %esp,%ebx\n\t" \
"pushl %ebx\n\t" \
"pushl $" #nr "\n\t" \
"call "SYMBOL_NAME_STR(do_IRQ)"\n\t" \
"addl $8,%esp\n\t" \
"cli\n\t" \
UNBLK_##chip(mask) \
"decl "SYMBOL_NAME_STR(intr_count)"\n\t" \
"incl "SYMBOL_NAME_STR(syscall_count)"\n\t" \
"jmp ret_from_sys_call\n" \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(fast_IRQ) #nr "_interrupt:\n\t" \
SAVE_MOST \
ACK_##chip(mask) \
SMP_PROF_IPI_CNT \
"pushl $" #nr "\n\t" \
"call "SYMBOL_NAME_STR(do_fast_IRQ)"\n\t" \
"addl $4,%esp\n\t" \
"cli\n\t" \
UNBLK_##chip(mask) \
RESTORE_MOST \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(bad_IRQ) #nr "_interrupt:\n\t" \
SAVE_MOST \
ACK_##chip(mask) \
RESTORE_MOST);
#define BUILD_RESCHEDIRQ(nr) \
asmlinkage void IRQ_NAME(nr); \
__asm__( \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(IRQ) #nr "_interrupt:\n\t" \
"pushl $-"#nr"-2\n\t" \
SAVE_ALL \
ENTER_KERNEL \
"incl "SYMBOL_NAME_STR(intr_count)"\n\t"\
"sti\n\t" \
"movl %esp,%ebx\n\t" \
"pushl %ebx\n\t" \
"pushl $" #nr "\n\t" \
"call "SYMBOL_NAME_STR(smp_reschedule_irq)"\n\t" \
"addl $8,%esp\n\t" \
"cli\n\t" \
"decl "SYMBOL_NAME_STR(intr_count)"\n\t" \
"incl "SYMBOL_NAME_STR(syscall_count)"\n\t" \
"jmp ret_from_sys_call\n");
#else
#define BUILD_IRQ(chip,nr,mask) \
asmlinkage void IRQ_NAME(nr); \
asmlinkage void FAST_IRQ_NAME(nr); \
asmlinkage void BAD_IRQ_NAME(nr); \
__asm__( \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(IRQ) #nr "_interrupt:\n\t" \
"pushl $-"#nr"-2\n\t" \
SAVE_ALL \
ACK_##chip(mask) \
"incl "SYMBOL_NAME_STR(intr_count)"\n\t"\
"sti\n\t" \
"movl %esp,%ebx\n\t" \
"pushl %ebx\n\t" \
"pushl $" #nr "\n\t" \
"call "SYMBOL_NAME_STR(do_IRQ)"\n\t" \
"addl $8,%esp\n\t" \
"cli\n\t" \
UNBLK_##chip(mask) \
"decl "SYMBOL_NAME_STR(intr_count)"\n\t" \
"jmp ret_from_sys_call\n" \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(fast_IRQ) #nr "_interrupt:\n\t" \
SAVE_MOST \
ACK_##chip(mask) \
"incl "SYMBOL_NAME_STR(intr_count)"\n\t" \
"pushl $" #nr "\n\t" \
"call "SYMBOL_NAME_STR(do_fast_IRQ)"\n\t" \
"addl $4,%esp\n\t" \
"cli\n\t" \
UNBLK_##chip(mask) \
"decl "SYMBOL_NAME_STR(intr_count)"\n\t" \
RESTORE_MOST \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(bad_IRQ) #nr "_interrupt:\n\t" \
SAVE_MOST \
ACK_##chip(mask) \
RESTORE_MOST);
#endif
#endif
|
