patch-2.1.37 linux/arch/i386/kernel/irq.h

• Lines: 204
• Date: Mon May 12 10:35:37 1997
• Orig file: v2.1.36/linux/arch/i386/kernel/irq.h
• Orig date: Wed Apr 23 19:01:14 1997

diff -u --recursive --new-file v2.1.36/linux/arch/i386/kernel/irq.h linux/arch/i386/kernel/irq.h
@@ -33,7 +33,6 @@
 
 static inline void irq_exit(int cpu, int irq)
 {
-	__cli();
 	hardirq_exit(cpu);
 	release_irqlock(cpu);
 }
@@ -64,18 +63,8 @@
 	"mov %dx,%es\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.
+ * These are used just for the "bad" interrupt handlers, 
+ * which just clear the mask and return..
  */
 #define SAVE_MOST \
 	"cld\n\t" \
@@ -96,92 +85,13 @@
 	"pop %es\n\t" \
 	"iret"
 
-/*
- * Some fast irq handlers might want to access saved registers (mostly
- * cs or flags)
- */
-
-struct fast_irq_regs {
-	long ecx;
-	long edx;
-	long eax;
-	int  xds;
-	int  xes;
-	long eip;
-	int  xcs;
-	long eflags;
-	long esp;
-	int  xss;
-};
-
-/*
- * 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,nr) \
-	"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,nr) \
-	"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__
-
 #define GET_CURRENT \
-	"movl "SYMBOL_NAME_STR(apic_reg)", %ebx\n\t" \
-	"movl 32(%ebx), %ebx\n\t" \
-	"shrl $22,%ebx\n\t" \
-	"andl $0x3C,%ebx\n\t" \
-	"movl " SYMBOL_NAME_STR(current_set) "(,%ebx),%ebx\n\t"
-	
-#else
-
-#define GET_CURRENT \
-	"movl " SYMBOL_NAME_STR(current_set) ",%ebx\n\t"
-	
-#endif
+	"movl %esp, %ebx\n\t" \
+	"andl $-8192, %ebx\n\t"
 
 #ifdef __SMP__
 
@@ -205,66 +115,30 @@
 "\n"__ALIGN_STR"\n" \
 SYMBOL_NAME_STR(x) ":\n\t" \
 	"pushl $-1\n\t" \
-        SAVE_ALL \
-        "movl %esp,%eax\n\t" \
-        "pushl %eax\n\t" \
+	SAVE_ALL \
+	"movl %esp,%eax\n\t" \
+	"pushl %eax\n\t" \
 	"call "SYMBOL_NAME_STR(smp_##x)"\n\t" \
-        "addl $4,%esp\n\t" \
+	"addl $4,%esp\n\t" \
 	"jmp ret_from_intr\n");
 
 #endif /* __SMP__ */
 
-#define BUILD_IRQ(chip,nr,mask) \
-asmlinkage void IRQ_NAME(nr); \
-asmlinkage void FAST_IRQ_NAME(nr); \
-asmlinkage void BAD_IRQ_NAME(nr); \
+#define BUILD_COMMON_IRQ() \
 __asm__( \
-"\n"__ALIGN_STR"\n" \
-SYMBOL_NAME_STR(IRQ) #nr "_interrupt:\n\t" \
-	"pushl $-"#nr"-2\n\t" \
+	"\n" __ALIGN_STR"\n" \
+	"common_interrupt:\n\t" \
 	SAVE_ALL \
-	ACK_##chip(mask,(nr&7)) \
-	"movl %esp,%eax\n\t" \
-	"pushl %eax\n\t" \
-	"pushl $" #nr "\n\t" \
-	"call "SYMBOL_NAME_STR(do_IRQ)"\n\t" \
-	"addl $8,%esp\n\t" \
-	UNBLK_##chip(mask) \
-	"jmp ret_from_intr\n" \
-"\n"__ALIGN_STR"\n" \
-SYMBOL_NAME_STR(fast_IRQ) #nr "_interrupt:\n\t" \
-	SAVE_MOST \
-	ACK_##chip(mask,(nr&7)) \
-	"pushl $" #nr "\n\t" \
-	"call "SYMBOL_NAME_STR(do_fast_IRQ)"\n\t" \
-	"addl $4,%esp\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,(nr&7)) \
-	RESTORE_MOST);
-	
-#define BUILD_TIMER_IRQ(chip,nr,mask) \
+	"pushl $ret_from_intr\n\t" \
+	"jmp "SYMBOL_NAME_STR(do_IRQ));
+
+#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(fast_IRQ) #nr "_interrupt:\n\t" \
-SYMBOL_NAME_STR(bad_IRQ) #nr "_interrupt:\n\t" \
 SYMBOL_NAME_STR(IRQ) #nr "_interrupt:\n\t" \
-	"pushl $-"#nr"-2\n\t" \
-	SAVE_ALL \
-	ACK_##chip(mask,(nr&7)) \
-	"movl %esp,%eax\n\t" \
-	"pushl %eax\n\t" \
-	"pushl $" #nr "\n\t" \
-	"call "SYMBOL_NAME_STR(do_IRQ)"\n\t" \
-	"addl $8,%esp\n\t" \
-	UNBLK_##chip(mask) \
-	"jmp ret_from_intr\n");
+	"pushl $"#nr"-256\n\t" \
+	"jmp common_interrupt");
 
 /*
  * x86 profiling function, SMP safe. We might want to do this in