1998-11-30 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>

	Clean up linux emulation code to make it architecture-independent
	as much as possible.

	* linux: Renamed from linuxdev.
	* Makefile.in (objfiles): Add linux.o instead of linuxdev.o.
	(MAKE): New variable. Used for the linux.o target.
	* configure.in: Add AC_CHECK_TOOL(MAKE, make).
	* i386/i386/spl.h: Include <i386/ipl.h>, for compatibility with
	OSF Mach 3.0. Suggested by Elgin Lee <ehl@funghi.com>.
	* linux/src: Renamed from linux/linux.
	* linux/dev: Renamed from linux/mach.
	* linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h,
	instead of mach/include/linux/autoconf.h.
	* Makefile.in (all): Target ../linux.o instead of ../linuxdev.o.
	* linux/dev/drivers/block/genhd.c: Include <machine/spl.h> instead
	of <i386/ipl.h>.
	* linux/dev/drivers/net/auto_irq.c: Remove unneeded header files,
	<i386/ipl.h> and <i386/pic.h>.
	* linux/dev/init/main.c: Many i386-dependent codes moved to ...
	* linux/dev/arch/i386/irq.c: ... here.
	* linux/dev/arch/i386/setup.c: New file.
	* linux/dev/arch/i386/linux_emul.h: Likewise.
	* linux/dev/arch/i386/glue/timer.c: Merged into sched.c.
	* linux/dev/arch/i386/glue/sched.c: Include <machine/spl.h> instead
	of <i386/ipl.h>, and moved to ...
	* linux/dev/kernel/sched.c: ... here.
	* linux/dev/arch/i386/glue/block.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/blocl.c: ... here.
	* linux/dev/arch/i386/glue/net.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/net.c: ... here.
	* linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ...
	* linux/dev/glue/misc.c: ... here.
	* linux/dev/arch/i386/glue/kmem.c: Moved to ...
	* linux/dev/glue/kmem.c: ... here.

1 files changed, 127 insertions, 0 deletions

diff --git a/linux/src/include/asm-i386/semaphore.h b/linux/src/include/asm-i386/semaphore.h
new file mode 100644
index 0000000..1486d1c
--- /dev/null
+++ b/linux/src/include/asm-i386/semaphore.h
@@ -0,0 +1,127 @@
+#ifndef _I386_SEMAPHORE_H
+#define _I386_SEMAPHORE_H
+
+#include <linux/linkage.h>
+#include <asm/system.h>
+
+/*
+ * SMP- and interrupt-safe semaphores..
+ *
+ * (C) Copyright 1996 Linus Torvalds
+ *
+ * Modified 1996-12-23 by Dave Grothe <dave@gcom.com> to fix bugs in
+ *                     the original code and to make semaphore waits
+ *                     interruptible so that processes waiting on
+ *                     semaphores can be killed.
+ *
+ * If you would like to see an analysis of this implementation, please
+ * ftp to gcom.com and download the file
+ * /pub/linux/src/semaphore/semaphore-2.0.24.tar.gz.
+ *
+ */
+
+struct semaphore {
+	int count;
+	int waking;
+	int lock ;			/* to make waking testing atomic */
+	struct wait_queue * wait;
+};
+
+#define MUTEX ((struct semaphore) { 1, 0, 0, NULL })
+#define MUTEX_LOCKED ((struct semaphore) { 0, 0, 0, NULL })
+
+asmlinkage void down_failed(void /* special register calling convention */);
+asmlinkage void up_wakeup(void /* special register calling convention */);
+
+extern void __down(struct semaphore * sem);
+extern void __up(struct semaphore * sem);
+
+/*
+ * This is ugly, but we want the default case to fall through.
+ * "down_failed" is a special asm handler that calls the C
+ * routine that actually waits. See arch/i386/lib/semaphore.S
+ */
+extern inline void down(struct semaphore * sem)
+{
+	__asm__ __volatile__(
+		"# atomic down operation\n\t"
+		"movl $1f,%%eax\n\t"
+#ifdef __SMP__
+		"lock ; "
+#endif
+		"decl 0(%0)\n\t"
+		"js " SYMBOL_NAME_STR(down_failed) "\n"
+		"1:\n"
+		:/* no outputs */
+		:"c" (sem)
+		:"ax","dx","memory");
+}
+
+/*
+ * Primitives to spin on a lock.  Needed only for SMP version.
+ */
+extern inline void get_buzz_lock(int *lock_ptr)
+{
+#ifdef __SMP__
+        while (xchg(lock_ptr,1) != 0) ;
+#endif
+} /* get_buzz_lock */
+
+extern inline void give_buzz_lock(int *lock_ptr)
+{
+#ifdef __SMP__
+        *lock_ptr = 0 ;
+#endif
+} /* give_buzz_lock */
+
+asmlinkage int down_failed_interruptible(void);  /* params in registers */
+
+/*
+ * This version waits in interruptible state so that the waiting
+ * process can be killed.  The down_failed_interruptible routine
+ * returns negative for signalled and zero for semaphore acquired.
+ */
+extern inline int down_interruptible(struct semaphore * sem)
+{
+	int	ret ;
+
+        __asm__ __volatile__(
+                "# atomic interruptible down operation\n\t"
+                "movl $2f,%%eax\n\t"
+#ifdef __SMP__
+                "lock ; "
+#endif
+                "decl 0(%1)\n\t"
+                "js " SYMBOL_NAME_STR(down_failed_interruptible) "\n\t"
+                "xorl %%eax,%%eax\n"
+                "2:\n"
+                :"=a" (ret)
+                :"c" (sem)
+                :"ax","dx","memory");
+
+	return(ret) ;
+}
+
+/*
+ * Note! This is subtle. We jump to wake people up only if
+ * the semaphore was negative (== somebody was waiting on it).
+ * The default case (no contention) will result in NO
+ * jumps for both down() and up().
+ */
+extern inline void up(struct semaphore * sem)
+{
+	__asm__ __volatile__(
+		"# atomic up operation\n\t"
+		"movl $1f,%%eax\n\t"
+#ifdef __SMP__
+		"lock ; "
+#endif
+		"incl 0(%0)\n\t"
+		"jle " SYMBOL_NAME_STR(up_wakeup)
+		"\n1:"
+		:/* no outputs */
+		:"c" (sem)
+		:"ax", "dx", "memory");
+}
+
+#endif