patch-2.3.14 linux/include/asm-i386/hw_irq.h

• Lines: 224
• Date: Wed Aug 18 16:45:10 1999
• Orig file: v2.3.13/linux/include/asm-i386/hw_irq.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.13/linux/include/asm-i386/hw_irq.h linux/include/asm-i386/hw_irq.h
@@ -0,0 +1,223 @@
+#ifndef _ASM_HW_IRQ_H
+#define _ASM_HW_IRQ_H
+
+/*
+ *	linux/include/asm/hw_irq.h
+ *
+ *	(C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
+ *
+ *	moved some of the old arch/i386/kernel/irq.h to here. VY
+ *
+ *	IRQ/IPI changes taken from work by Thomas Radke
+ *	<tomsoft@informatik.tu-chemnitz.de>
+ */
+
+#include <asm/irq.h>
+
+/*
+ * IDT vectors usable for external interrupt sources start
+ * at 0x20:
+ */
+#define FIRST_EXTERNAL_VECTOR	0x20
+
+#define SYSCALL_VECTOR		0x80
+
+/*
+ * Vectors 0x20-0x2f are used for ISA interrupts.
+ */
+
+/*
+ * Special IRQ vectors used by the SMP architecture:
+ *
+ * (some of the following vectors are 'rare', they are merged
+ *  into a single vector (FUNCTION_VECTOR) to save vector space.
+ *  TLB, reschedule and local APIC vectors are performance-critical.)
+ */
+#define RESCHEDULE_VECTOR	0x30
+#define INVALIDATE_TLB_VECTOR	0x31
+#define STOP_CPU_VECTOR		0x40
+#define LOCAL_TIMER_VECTOR	0x41
+#define CALL_FUNCTION_VECTOR	0x50
+
+/*
+ * First APIC vector available to drivers: (vectors 0x51-0xfe)
+ */
+#define IRQ0_TRAP_VECTOR	0x51
+
+/*
+ * This IRQ should never happen, but we print a message nevertheless.
+ */
+#define SPURIOUS_APIC_VECTOR	0xff
+
+extern int irq_vector[NR_IRQS];
+#define IO_APIC_VECTOR(irq)	irq_vector[irq]
+
+extern void init_IRQ_SMP(void);
+
+/*
+ * Various low-level irq details needed by irq.c, process.c,
+ * time.c, io_apic.c and smp.c
+ *
+ * Interrupt entry/exit code at both C and assembly level
+ */
+
+extern void no_action(int cpl, void *dev_id, struct pt_regs *regs);
+extern void mask_irq(unsigned int irq);
+extern void unmask_irq(unsigned int irq);
+extern void disable_8259A_irq(unsigned int irq);
+extern int i8259A_irq_pending(unsigned int irq);
+extern void ack_APIC_irq(void);
+extern void FASTCALL(send_IPI_self(int vector));
+extern void init_VISWS_APIC_irqs(void);
+extern void setup_IO_APIC(void);
+extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
+extern void make_8259A_irq(unsigned int irq);
+extern void send_IPI(int dest, int vector);
+extern void init_pic_mode(void);
+extern void print_IO_APIC(void);
+
+extern unsigned long io_apic_irqs;
+
+extern char _stext, _etext;
+
+#define MAX_IRQ_SOURCES 128
+#define MAX_MP_BUSSES 32
+enum mp_bustype {
+	MP_BUS_ISA,
+	MP_BUS_EISA,
+	MP_BUS_PCI
+};
+extern int mp_bus_id_to_type [MAX_MP_BUSSES];
+extern int mp_bus_id_to_pci_bus [MAX_MP_BUSSES];
+
+
+#ifdef __SMP__
+#define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))
+
+#else
+
+#define IO_APIC_IRQ(x)	(0)
+
+#endif
+
+#define __STR(x) #x
+#define STR(x) __STR(x)
+
+#define SAVE_ALL \
+	"cld\n\t" \
+	"pushl %es\n\t" \
+	"pushl %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" \
+	"movl %dx,%ds\n\t" \
+	"movl %dx,%es\n\t"
+
+#define IRQ_NAME2(nr) nr##_interrupt(void)
+#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
+
+#define GET_CURRENT \
+	"movl %esp, %ebx\n\t" \
+	"andl $-8192, %ebx\n\t"
+
+#ifdef __SMP__
+
+/*
+ *	SMP has a few special interrupts for IPI messages
+ */
+
+	/* there is a second layer of macro just to get the symbolic
+	   name for the vector evaluated. This change is for RTLinux */
+#define BUILD_SMP_INTERRUPT(x,v) XBUILD_SMP_INTERRUPT(x,v)
+#define XBUILD_SMP_INTERRUPT(x,v)\
+asmlinkage void x(void); \
+asmlinkage void call_##x(void); \
+__asm__( \
+"\n"__ALIGN_STR"\n" \
+SYMBOL_NAME_STR(x) ":\n\t" \
+	"pushl $"#v"\n\t" \
+	SAVE_ALL \
+	SYMBOL_NAME_STR(call_##x)":\n\t" \
+	"call "SYMBOL_NAME_STR(smp_##x)"\n\t" \
+	"jmp ret_from_intr\n");
+
+#define BUILD_SMP_TIMER_INTERRUPT(x,v) XBUILD_SMP_TIMER_INTERRUPT(x,v)
+#define XBUILD_SMP_TIMER_INTERRUPT(x,v) \
+asmlinkage void x(struct pt_regs * regs); \
+asmlinkage void call_##x(void); \
+__asm__( \
+"\n"__ALIGN_STR"\n" \
+SYMBOL_NAME_STR(x) ":\n\t" \
+	"pushl $"#v"\n\t" \
+	SAVE_ALL \
+	"movl %esp,%eax\n\t" \
+	"pushl %eax\n\t" \
+	SYMBOL_NAME_STR(call_##x)":\n\t" \
+	"call "SYMBOL_NAME_STR(smp_##x)"\n\t" \
+	"addl $4,%esp\n\t" \
+	"jmp ret_from_intr\n");
+
+#endif /* __SMP__ */
+
+#define BUILD_COMMON_IRQ() \
+asmlinkage void call_do_IRQ(void); \
+__asm__( \
+	"\n" __ALIGN_STR"\n" \
+	"common_interrupt:\n\t" \
+	SAVE_ALL \
+	"pushl $ret_from_intr\n\t" \
+	SYMBOL_NAME_STR(call_do_IRQ)":\n\t" \
+	"jmp "SYMBOL_NAME_STR(do_IRQ));
+
+/* 
+ * subtle. orig_eax is used by the signal code to distinct between
+ * system calls and interrupted 'random user-space'. Thus we have
+ * to put a negative value into orig_eax here. (the problem is that
+ * both system calls and IRQs want to have small integer numbers in
+ * orig_eax, and the syscall code has won the optimization conflict ;)
+ *
+ * Subtle as a pigs ear.  VY
+ */
+
+#define BUILD_IRQ(nr) \
+asmlinkage void IRQ_NAME(nr); \
+__asm__( \
+"\n"__ALIGN_STR"\n" \
+SYMBOL_NAME_STR(IRQ) #nr "_interrupt:\n\t" \
+	"pushl $"#nr"-256\n\t" \
+	"jmp common_interrupt");
+
+/*
+ * x86 profiling function, SMP safe. We might want to do this in
+ * assembly totally?
+ */
+static inline void x86_do_profile (unsigned long eip)
+{
+	if (prof_buffer && current->pid) {
+		eip -= (unsigned long) &_stext;
+		eip >>= prof_shift;
+		/*
+		 * Don't ignore out-of-bounds EIP values silently,
+		 * put them into the last histogram slot, so if
+		 * present, they will show up as a sharp peak.
+		 */
+		if (eip > prof_len-1)
+			eip = prof_len-1;
+		atomic_inc((atomic_t *)&prof_buffer[eip]);
+	}
+}
+
+#ifdef __SMP__ /*more of this file should probably be ifdefed SMP */
+static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {
+		send_IPI_self(IO_APIC_VECTOR(i));
+}
+#else
+static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
+#endif
+
+#endif /* _ASM_HW_IRQ_H */