patch-2.4.2 linux/include/asm-cris/irq.h

• Lines: 103
• Date: Thu Feb 8 16:32:44 2001
• Orig file: v2.4.1/linux/include/asm-cris/irq.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/include/asm-cris/irq.h linux/include/asm-cris/irq.h
@@ -0,0 +1,102 @@
+/*
+ * Interrupt handling assembler for Linux/CRIS
+ *
+ * Copyright (c) 2000 Axis Communications AB
+ *
+ * Authors:   Bjorn Wesen (bjornw@axis.com)
+ *
+ */
+
+#ifndef _ASM_IRQ_H
+#define _ASM_IRQ_H
+
+/*
+ *	linux/include/asm-cris/irq.h
+ */
+
+#include <linux/linkage.h>
+#include <asm/segment.h>
+
+#include <asm/sv_addr_ag.h>
+
+#define NR_IRQS 26     /* TODO: what is this for Etrax100/LX ? */
+
+extern void disable_irq(unsigned int);
+extern void enable_irq(unsigned int);
+
+#define disable_irq_nosync      disable_irq
+#define enable_irq_nosync       enable_irq
+
+/* our fine, global, etrax irq vector! the pointer lives in the head.S file. */
+
+typedef void (*irqvectptr)(void);
+
+struct etrax_interrupt_vector {
+	irqvectptr v[256];
+};
+
+extern struct etrax_interrupt_vector *etrax_irv;
+void set_int_vector(int n, irqvectptr addr, irqvectptr saddr);
+void set_break_vector(int n, irqvectptr addr);
+
+#define __STR(x) #x
+#define STR(x) __STR(x)
+ 
+/* SAVE_ALL saves registers so they match pt_regs */
+
+#define SAVE_ALL \
+  "push irp\n\t"       /* push instruction pointer */ \
+  "push srp\n\t"       /* push subroutine return pointer */ \
+  "push dccr\n\t"      /* push condition codes */ \
+  "push mof\n\t"       /* push multiply overflow reg */ \
+  "di\n\t"             /* need to disable irq's at this point */\
+  "subq 14*4,sp\n\t"   /* make room for r0-r13 */ \
+  "movem r13,[sp]\n\t" /* push the r0-r13 registers */ \
+  "push r10\n\t"       /* push orig_r10 */ \
+  "clear.d [sp=sp-4]\n\t"  /* frametype - this is a normal stackframe */
+
+  /* BLOCK_IRQ and UNBLOCK_IRQ do the same as mask_irq and unmask_irq in irq.c */
+
+#define BLOCK_IRQ(mask,nr) \
+  "move.d " #mask ",r0\n\t" \
+  "move.d r0,[0xb00000d8]\n\t" 
+  
+#define UNBLOCK_IRQ(mask) \
+  "move.d " #mask ",r0\n\t" \
+  "move.d r0,[0xb00000dc]\n\t" 
+
+#define IRQ_NAME2(nr) nr##_interrupt(void)
+#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
+#define sIRQ_NAME(nr) IRQ_NAME2(sIRQ##nr)
+#define BAD_IRQ_NAME(nr) IRQ_NAME2(bad_IRQ##nr)
+
+  /* the asm IRQ handler makes sure the causing IRQ is blocked, then it calls
+   * do_IRQ (with irq disabled still). after that it unblocks and jumps to
+   * ret_from_intr (entry.S)
+   */
+
+#define BUILD_IRQ(nr,mask) \
+void IRQ_NAME(nr); \
+void sIRQ_NAME(nr); \
+void BAD_IRQ_NAME(nr); \
+__asm__ ( \
+          ".text\n\t" \
+          "_IRQ" #nr "_interrupt:\n\t" \
+	  SAVE_ALL \
+	  "_sIRQ" #nr "_interrupt:\n\t" /* shortcut for the multiple irq handler */ \
+	  BLOCK_IRQ(mask,nr) /* this must be done to prevent irq loops when we ei later */ \
+	  "moveq "#nr",r10\n\t" \
+	  "move.d sp,r11\n\t" \
+	  "jsr _do_IRQ\n\t" /* irq.c, r10 and r11 are arguments */ \
+	  UNBLOCK_IRQ(mask) \
+	  "moveq 0,r9\n\t" /* make ret_from_intr realise we came from an irq */ \
+	  "jump _ret_from_intr\n\t" \
+          "_bad_IRQ" #nr "_interrupt:\n\t" \
+	  "push r0\n\t" \
+	  BLOCK_IRQ(mask,nr) \
+	  "pop r0\n\t");
+
+
+#endif  /* _ASM_IRQ_H */
+
+