| #ifndef _ASM_IRQ_H |
| #define _ASM_IRQ_H |
| |
| /* |
| * linux/include/asm/irq.h |
| * |
| * (C) 1992, 1993 Linus Torvalds |
| */ |
| |
| #include <linux/segment.h> |
| #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" |
| |
| /* |
| * 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 ",_cache_21\n\t" \ |
| "movb _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 ",_cache_A1\n\t" \ |
| "movb _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 "),_cache_21\n\t" \ |
| "movb _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 "),_cache_A1\n\t" \ |
| "movb _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) |
| |
| #define BUILD_IRQ(chip,nr,mask) \ |
| void IRQ_NAME(nr); \ |
| void FAST_IRQ_NAME(nr); \ |
| void BAD_IRQ_NAME(nr); \ |
| __asm__( \ |
| "\n.align 4\n" \ |
| "_IRQ" #nr "_interrupt:\n\t" \ |
| "pushl $-"#nr"-2\n\t" \ |
| SAVE_ALL \ |
| ACK_##chip(mask) \ |
| "incl _intr_count\n\t"\ |
| "sti\n\t" \ |
| "movl %esp,%ebx\n\t" \ |
| "pushl %ebx\n\t" \ |
| "pushl $" #nr "\n\t" \ |
| "call _do_IRQ\n\t" \ |
| "addl $8,%esp\n\t" \ |
| "cli\n\t" \ |
| UNBLK_##chip(mask) \ |
| "decl _intr_count\n\t" \ |
| "jne ret_from_sys_call\n\t" \ |
| "movl _bh_mask,%eax\n\t" \ |
| "andl _bh_active,%eax\n\t" \ |
| "je ret_from_sys_call\n\t" \ |
| "incl _intr_count\n\t" \ |
| "sti\n\t" \ |
| "bsfl %eax,%eax\n\t" \ |
| "btrl %eax,_bh_active\n\t" \ |
| "pushl %eax\n\t" \ |
| "call _do_bottom_half\n\t" \ |
| "addl $4,%esp\n\t" \ |
| "cli\n\t" \ |
| "decl _intr_count\n\t" \ |
| "jmp ret_from_sys_call\n" \ |
| "\n.align 4\n" \ |
| "_fast_IRQ" #nr "_interrupt:\n\t" \ |
| SAVE_MOST \ |
| ACK_##chip(mask) \ |
| "incl _intr_count\n\t" \ |
| "pushl $" #nr "\n\t" \ |
| "call _do_fast_IRQ\n\t" \ |
| "addl $4,%esp\n\t" \ |
| "cli\n\t" \ |
| UNBLK_##chip(mask) \ |
| "decl _intr_count\n\t" \ |
| "jne 1f\n\t" \ |
| "movl _bh_mask,%eax\n\t" \ |
| "andl _bh_active,%eax\n\t" \ |
| "jne 2f\n" \ |
| "1:\t" \ |
| RESTORE_MOST \ |
| "\n.align 4\n" \ |
| "2:\tincl _intr_count\n\t" \ |
| "sti\n\t" \ |
| "bsfl %eax,%eax\n\t" \ |
| "btrl %eax,_bh_active\n\t" \ |
| "pushl %eax\n\t" \ |
| "call _do_bottom_half\n\t" \ |
| "addl $4,%esp\n\t" \ |
| "cli\n\t" \ |
| "decl _intr_count\n\t" \ |
| RESTORE_MOST \ |
| "\n\n.align 4\n" \ |
| "_bad_IRQ" #nr "_interrupt:\n\t" \ |
| SAVE_MOST \ |
| ACK_##chip(mask) \ |
| RESTORE_MOST); |
| |
| #endif |