2001-08-18 Marcus Brinkmann <marcus@gnu.org>

	* linux/src/drivers/net/eepro100.c: File updated to version in
	Linux 2.2.19.
	* linux/src/include/asm-i386/spinlock.h: New file from Linux 2.2.19.
	* linux/src/include/asm-i386/hardirq.h: Likewise.
	* linux/src/include/linux/spinlock.h: Likewise.
	* linux/src/include/linux/compatmac.h: Likewise.
        * linux/dev/drivers/net/eepro100.c: New file, modified version from
        the above to glue it in gnumach.
        Submitted by Kapil H. Paranjape <kapil@imsc.ernet.in>.

4 files changed, 483 insertions, 0 deletions

diff --git a/linux/src/include/asm-i386/hardirq.h b/linux/src/include/asm-i386/hardirq.h
new file mode 100644
index 0000000..5339613
--- /dev/null
+++ b/linux/src/include/asm-i386/hardirq.h
@@ -0,0 +1,65 @@
+#ifndef __ASM_HARDIRQ_H
+#define __ASM_HARDIRQ_H
+
+#include <linux/tasks.h>
+
+extern unsigned int local_irq_count[NR_CPUS];
+
+/*
+ * Are we in an interrupt context? Either doing bottom half
+ * or hardware interrupt processing?
+ */
+#define in_interrupt() ({ int __cpu = smp_processor_id(); \
+	(local_irq_count[__cpu] + local_bh_count[__cpu] != 0); })
+
+#ifndef __SMP__
+
+#define hardirq_trylock(cpu)	(local_irq_count[cpu] == 0)
+#define hardirq_endlock(cpu)	do { } while (0)
+
+#define hardirq_enter(cpu)	(local_irq_count[cpu]++)
+#define hardirq_exit(cpu)	(local_irq_count[cpu]--)
+
+#define synchronize_irq()	barrier()
+
+#else
+
+#include <asm/atomic.h>
+
+extern unsigned char global_irq_holder;
+extern unsigned volatile int global_irq_lock;
+extern atomic_t global_irq_count;
+
+static inline void release_irqlock(int cpu)
+{
+	/* if we didn't own the irq lock, just ignore.. */
+	if (global_irq_holder == (unsigned char) cpu) {
+		global_irq_holder = NO_PROC_ID;
+		clear_bit(0,&global_irq_lock);
+	}
+}
+
+static inline void hardirq_enter(int cpu)
+{
+	++local_irq_count[cpu];
+	atomic_inc(&global_irq_count);
+}
+
+static inline void hardirq_exit(int cpu)
+{
+	atomic_dec(&global_irq_count);
+	--local_irq_count[cpu];
+}
+
+static inline int hardirq_trylock(int cpu)
+{
+	return !atomic_read(&global_irq_count) && !test_bit(0,&global_irq_lock);
+}
+
+#define hardirq_endlock(cpu)	do { } while (0)
+
+extern void synchronize_irq(void);
+
+#endif /* __SMP__ */
+
+#endif /* __ASM_HARDIRQ_H */
diff --git a/linux/src/include/asm-i386/spinlock.h b/linux/src/include/asm-i386/spinlock.h
new file mode 100644
index 0000000..18119d4
--- /dev/null
+++ b/linux/src/include/asm-i386/spinlock.h
@@ -0,0 +1,262 @@
+#ifndef __ASM_SPINLOCK_H
+#define __ASM_SPINLOCK_H
+
+#ifndef __SMP__
+
+#define DEBUG_SPINLOCKS	0	/* 0 == no debugging, 1 == maintain lock state, 2 == full debug */
+
+#if (DEBUG_SPINLOCKS < 1)
+
+/*
+ * Your basic spinlocks, allowing only a single CPU anywhere
+ *
+ * Gcc-2.7.x has a nasty bug with empty initializers.
+ */
+#if (__GNUC__ > 2) || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)
+  typedef struct { } spinlock_t;
+  #define SPIN_LOCK_UNLOCKED (spinlock_t) { }
+#else
+  typedef struct { int gcc_is_buggy; } spinlock_t;
+  #define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
+#endif
+
+#define spin_lock_init(lock)	do { } while(0)
+#define spin_lock(lock)		(void)(lock) /* Not "unused variable". */
+#define spin_trylock(lock)	(1)
+#define spin_unlock_wait(lock)	do { } while(0)
+#define spin_unlock(lock)	do { } while(0)
+#define spin_lock_irq(lock)	cli()
+#define spin_unlock_irq(lock)	sti()
+
+#define spin_lock_irqsave(lock, flags) \
+	do { save_flags(flags); cli(); } while (0)
+#define spin_unlock_irqrestore(lock, flags) \
+	restore_flags(flags)
+
+#elif (DEBUG_SPINLOCKS < 2)
+
+typedef struct {
+	volatile unsigned int lock;
+} spinlock_t;
+#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
+
+#define spin_lock_init(x)	do { (x)->lock = 0; } while (0)
+#define spin_trylock(lock)	(!test_and_set_bit(0,(lock)))
+
+#define spin_lock(x)		do { (x)->lock = 1; } while (0)
+#define spin_unlock_wait(x)	do { } while (0)
+#define spin_unlock(x)		do { (x)->lock = 0; } while (0)
+#define spin_lock_irq(x)	do { cli(); spin_lock(x); } while (0)
+#define spin_unlock_irq(x)	do { spin_unlock(x); sti(); } while (0)
+
+#define spin_lock_irqsave(x, flags) \
+	do { save_flags(flags); spin_lock_irq(x); } while (0)
+#define spin_unlock_irqrestore(x, flags) \
+	do { spin_unlock(x); restore_flags(flags); } while (0)
+
+#else /* (DEBUG_SPINLOCKS >= 2) */
+
+typedef struct {
+	volatile unsigned int lock;
+	volatile unsigned int babble;
+	const char *module;
+} spinlock_t;
+#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0, 25, __BASE_FILE__ }
+
+#include <linux/kernel.h>
+
+#define spin_lock_init(x)	do { (x)->lock = 0; } while (0)
+#define spin_trylock(lock)	(!test_and_set_bit(0,(lock)))
+
+#define spin_lock(x)		do {unsigned long __spinflags; save_flags(__spinflags); cli(); if ((x)->lock&&(x)->babble) {printk("%s:%d: spin_lock(%s:%p) already locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 1; restore_flags(__spinflags);} while (0)
+#define spin_unlock_wait(x)	do {unsigned long __spinflags; save_flags(__spinflags); cli(); if ((x)->lock&&(x)->babble) {printk("%s:%d: spin_unlock_wait(%s:%p) deadlock\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} restore_flags(__spinflags);} while (0)
+#define spin_unlock(x)		do {unsigned long __spinflags; save_flags(__spinflags); cli(); if (!(x)->lock&&(x)->babble) {printk("%s:%d: spin_unlock(%s:%p) not locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 0; restore_flags(__spinflags);} while (0)
+#define spin_lock_irq(x)	do {cli(); if ((x)->lock&&(x)->babble) {printk("%s:%d: spin_lock_irq(%s:%p) already locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 1;} while (0)
+#define spin_unlock_irq(x)	do {cli(); if (!(x)->lock&&(x)->babble) {printk("%s:%d: spin_unlock_irq(%s:%p) not locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 0; sti();} while (0)
+
+#define spin_lock_irqsave(x,flags)      do {save_flags(flags); cli(); if ((x)->lock&&(x)->babble) {printk("%s:%d: spin_lock_irqsave(%s:%p) already locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 1;} while (0)
+#define spin_unlock_irqrestore(x,flags) do {cli(); if (!(x)->lock&&(x)->babble) {printk("%s:%d: spin_unlock_irqrestore(%s:%p) not locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 0; restore_flags(flags);} while (0)
+
+#endif	/* DEBUG_SPINLOCKS */
+
+/*
+ * Read-write spinlocks, allowing multiple readers
+ * but only one writer.
+ *
+ * NOTE! it is quite common to have readers in interrupts
+ * but no interrupt writers. For those circumstances we
+ * can "mix" irq-safe locks - any writer needs to get a
+ * irq-safe write-lock, but readers can get non-irqsafe
+ * read-locks.
+ *
+ * Gcc-2.7.x has a nasty bug with empty initializers.
+ */
+#if (__GNUC__ > 2) || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)
+  typedef struct { } rwlock_t;
+  #define RW_LOCK_UNLOCKED (rwlock_t) { }
+#else
+  typedef struct { int gcc_is_buggy; } rwlock_t;
+  #define RW_LOCK_UNLOCKED (rwlock_t) { 0 }
+#endif
+
+#define read_lock(lock)		(void)(lock) /* Not "unused variable." */
+#define read_unlock(lock)	do { } while(0)
+#define write_lock(lock)	(void)(lock) /* Not "unused variable." */
+#define write_unlock(lock)	do { } while(0)
+#define read_lock_irq(lock)	cli()
+#define read_unlock_irq(lock)	sti()
+#define write_lock_irq(lock)	cli()
+#define write_unlock_irq(lock)	sti()
+
+#define read_lock_irqsave(lock, flags)	\
+	do { save_flags(flags); cli(); } while (0)
+#define read_unlock_irqrestore(lock, flags) \
+	restore_flags(flags)
+#define write_lock_irqsave(lock, flags)	\
+	do { save_flags(flags); cli(); } while (0)
+#define write_unlock_irqrestore(lock, flags) \
+	restore_flags(flags)
+
+#else	/* __SMP__ */
+
+/*
+ * Your basic spinlocks, allowing only a single CPU anywhere
+ */
+
+typedef struct {
+	volatile unsigned int lock;
+} spinlock_t;
+
+#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
+
+#define spin_lock_init(x)	do { (x)->lock = 0; } while(0)
+/*
+ * Simple spin lock operations.  There are two variants, one clears IRQ's
+ * on the local processor, one does not.
+ *
+ * We make no fairness assumptions. They have a cost.
+ */
+
+#define spin_unlock_wait(x)	do { barrier(); } while(((volatile spinlock_t *)(x))->lock)
+
+typedef struct { unsigned long a[100]; } __dummy_lock_t;
+#define __dummy_lock(lock) (*(__dummy_lock_t *)(lock))
+
+/*
+ *	Intel PIV would benefit from using 'rep nop' here but on older
+ *	processors and non intel it is listed as 'undefined' so cannot be
+ *	blindly used. On 2.4 we should add a PIV CPU type for this one.
+ */
+#define spin_lock_string \
+	"\n1:\t" \
+	"lock ; btsl $0,%0\n\t" \
+	"jc 2f\n" \
+	".section .text.lock,\"ax\"\n" \
+	"2:\t" \
+	"rep; nop\n\t" \
+	"testb $1,%0\n\t" \
+	"jne 2b\n\t" \
+	"jmp 1b\n" \
+	".previous"
+
+#define spin_unlock_string \
+	"lock ; btrl $0,%0"
+
+#define spin_lock(lock) \
+__asm__ __volatile__( \
+	spin_lock_string \
+	:"=m" (__dummy_lock(lock)))
+
+#define spin_unlock(lock) \
+__asm__ __volatile__( \
+	spin_unlock_string \
+	:"=m" (__dummy_lock(lock)))
+
+#define spin_trylock(lock) (!test_and_set_bit(0,(lock)))
+
+#define spin_lock_irq(lock) \
+	do { __cli(); spin_lock(lock); } while (0)
+
+#define spin_unlock_irq(lock) \
+	do { spin_unlock(lock); __sti(); } while (0)
+
+#define spin_lock_irqsave(lock, flags) \
+	do { __save_flags(flags); __cli(); spin_lock(lock); } while (0)
+
+#define spin_unlock_irqrestore(lock, flags) \
+	do { spin_unlock(lock); __restore_flags(flags); } while (0)
+
+/*
+ * Read-write spinlocks, allowing multiple readers
+ * but only one writer.
+ *
+ * NOTE! it is quite common to have readers in interrupts
+ * but no interrupt writers. For those circumstances we
+ * can "mix" irq-safe locks - any writer needs to get a
+ * irq-safe write-lock, but readers can get non-irqsafe
+ * read-locks.
+ */
+typedef struct {
+	volatile unsigned int lock;
+	unsigned long previous;
+} rwlock_t;
+
+#define RW_LOCK_UNLOCKED (rwlock_t) { 0, 0 }
+
+/*
+ * On x86, we implement read-write locks as a 32-bit counter
+ * with the high bit (sign) being the "write" bit.
+ *
+ * The inline assembly is non-obvious. Think about it.
+ */
+#define read_lock(rw)	\
+	asm volatile("\n1:\t" \
+		     "lock ; incl %0\n\t" \
+		     "js 2f\n" \
+		     ".section .text.lock,\"ax\"\n" \
+		     "2:\tlock ; decl %0\n" \
+		     "3:\trep; nop\n\t" \
+		     "cmpl $0,%0\n\t" \
+		     "js 3b\n\t" \
+		     "jmp 1b\n" \
+		     ".previous" \
+		     :"=m" (__dummy_lock(&(rw)->lock)))
+
+#define read_unlock(rw) \
+	asm volatile("lock ; decl %0" \
+		:"=m" (__dummy_lock(&(rw)->lock)))
+
+#define write_lock(rw) \
+	asm volatile("\n1:\t" \
+		     "lock ; btsl $31,%0\n\t" \
+		     "jc 4f\n" \
+		     "2:\ttestl $0x7fffffff,%0\n\t" \
+		     "jne 3f\n" \
+		     ".section .text.lock,\"ax\"\n" \
+		     "3:\tlock ; btrl $31,%0\n" \
+		     "4:\trep; nop\n\t" \
+		     "cmp $0,%0\n\t" \
+		     "jne 4b\n\t" \
+		     "jmp 1b\n" \
+		     ".previous" \
+		     :"=m" (__dummy_lock(&(rw)->lock)))
+
+#define write_unlock(rw) \
+	asm volatile("lock ; btrl $31,%0":"=m" (__dummy_lock(&(rw)->lock)))
+
+#define read_lock_irq(lock)	do { __cli(); read_lock(lock); } while (0)
+#define read_unlock_irq(lock)	do { read_unlock(lock); __sti(); } while (0)
+#define write_lock_irq(lock)	do { __cli(); write_lock(lock); } while (0)
+#define write_unlock_irq(lock)	do { write_unlock(lock); __sti(); } while (0)
+
+#define read_lock_irqsave(lock, flags)	\
+	do { __save_flags(flags); __cli(); read_lock(lock); } while (0)
+#define read_unlock_irqrestore(lock, flags) \
+	do { read_unlock(lock); __restore_flags(flags); } while (0)
+#define write_lock_irqsave(lock, flags)	\
+	do { __save_flags(flags); __cli(); write_lock(lock); } while (0)
+#define write_unlock_irqrestore(lock, flags) \
+	do { write_unlock(lock); __restore_flags(flags); } while (0)
+
+#endif /* __SMP__ */
+#endif /* __ASM_SPINLOCK_H */
diff --git a/linux/src/include/linux/compatmac.h b/linux/src/include/linux/compatmac.h
new file mode 100644
index 0000000..5f9175d
--- /dev/null
+++ b/linux/src/include/linux/compatmac.h
@@ -0,0 +1,152 @@
+  /* 
+   * This header tries to allow you to write 2.3-compatible drivers, 
+   * but (using this header) still allows you to run them on 2.2 and 
+   * 2.0 kernels. 
+   *
+   * Sometimes, a #define replaces a "construct" that older kernels
+   * had. For example, 
+   *
+   *       DECLARE_MUTEX(name);
+   *
+   * replaces the older 
+   *
+   *       struct semaphore name = MUTEX;
+   *
+   * This file then declares the DECLARE_MUTEX macro to compile into the 
+   * older version. 
+   * 
+   * In some cases, a macro or function changes the number of arguments.
+   * In that case, there is nothing we can do except define an access 
+   * macro that provides the same functionality on both versions of Linux. 
+   * 
+   * This is the case for example with the "get_user" macro 2.0 kernels use:
+   *
+   *          a = get_user (b);
+   *  
+   * while newer kernels use 
+   * 
+   *          get_user (a,b);
+   *
+   * This is unfortunate. We therefore define "Get_user (a,b)" which looks
+   * almost the same as the 2.2+ construct, and translates into the 
+   * appropriate sequence for earlier constructs. 
+   * 
+   * Supported by this file are the 2.0 kernels, 2.2 kernels, and the 
+   * most recent 2.3 kernel. 2.3 support will be dropped as soon when 2.4
+   * comes out. 2.0 support may someday be dropped. But then again, maybe 
+   * not. 
+   *
+   * I'll try to maintain this, provided that Linus agrees with the setup. 
+   * Feel free to mail updates or suggestions. 
+   *
+   * -- R.E.Wolff@BitWizard.nl
+   *
+   */
+
+#ifndef COMPATMAC_H
+#define COMPATMAC_H
+
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE < 0x020100    /* Less than 2.1.0 */
+#define TWO_ZERO
+#else
+#if LINUX_VERSION_CODE < 0x020200   /* less than 2.2.x */
+#warning "Please use a 2.2.x kernel. "
+#else
+#if LINUX_VERSION_CODE < 0x020300   /* less than 2.3.x */
+#define TWO_TWO
+#else
+#define TWO_THREE
+#endif
+#endif
+#endif
+
+#ifdef TWO_ZERO
+
+/* Here is the section that makes the 2.2 compatible driver source 
+   work for 2.0 too! We mostly try to adopt the "new thingies" from 2.2, 
+   and provide for compatibility stuff here if possible. */
+
+/* Some 200 days (on intel) */
+#define MAX_SCHEDULE_TIMEOUT     ((long)(~0UL>>1))
+
+#include <linux/bios32.h>
+
+#define Get_user(a,b)                a = get_user(b)
+#define Put_user(a,b)                0,put_user(a,b)
+#define copy_to_user(a,b,c)          memcpy_tofs(a,b,c)
+
+static inline int copy_from_user(void *to,const void *from, int c) 
+{
+  memcpy_fromfs(to, from, c);
+  return 0;
+}
+
+#define pci_present                  pcibios_present
+#define pci_read_config_word         pcibios_read_config_word
+#define pci_read_config_dword        pcibios_read_config_dword
+
+static inline unsigned char get_irq (unsigned char bus, unsigned char fn)
+{
+	unsigned char t; 
+	pcibios_read_config_byte (bus, fn, PCI_INTERRUPT_LINE, &t);
+	return t;
+}
+
+static inline void *ioremap(unsigned long base, long length)
+{
+	if (base < 0x100000) return (void *)base;
+	return vremap (base, length);
+}
+
+#define my_iounmap(x, b)             (((long)x<0x100000)?0:vfree ((void*)x))
+
+#define capable(x)                   suser()
+
+#define queue_task                   queue_task_irq_off
+#define tty_flip_buffer_push(tty)    queue_task(&tty->flip.tqueue, &tq_timer)
+#define signal_pending(current)      (current->signal & ~current->blocked)
+#define schedule_timeout(to)         do {current->timeout = jiffies + (to);schedule ();} while (0)
+#define time_after(t1,t2)            (((long)t1-t2) > 0)
+
+
+#define test_and_set_bit(nr, addr)   set_bit(nr, addr)
+#define test_and_clear_bit(nr, addr) clear_bit(nr, addr)
+
+/* Not yet implemented on 2.0 */
+#define ASYNC_SPD_SHI  -1
+#define ASYNC_SPD_WARP -1
+
+
+/* Ugly hack: the driver_name doesn't exist in 2.0.x . So we define it
+   to the "name" field that does exist. As long as the assignments are
+   done in the right order, there is nothing to worry about. */
+#define driver_name           name 
+
+/* Should be in a header somewhere. They are in tty.h on 2.2 */
+#define TTY_HW_COOK_OUT       14 /* Flag to tell ntty what we can handle */
+#define TTY_HW_COOK_IN        15 /* in hardware - output and input       */
+
+/* The return type of a "close" routine. */
+#define INT                   void
+#define NO_ERROR              /* Nothing */
+
+#else
+
+/* The 2.2.x compatibility section. */
+#include <asm/uaccess.h>
+
+
+#define Get_user(a,b)         get_user(a,b)
+#define Put_user(a,b)         put_user(a,b)
+#define get_irq(pdev)         pdev->irq
+
+#define INT                   int
+#define NO_ERROR              0
+
+#define my_iounmap(x,b)       (iounmap((char *)(b)))
+
+#endif
+
+#endif
diff --git a/linux/src/include/linux/spinlock.h b/linux/src/include/linux/spinlock.h
new file mode 100644
index 0000000..790ac18
--- /dev/null
+++ b/linux/src/include/linux/spinlock.h
@@ -0,0 +1,4 @@
+#ifndef __LINUX_SPINLOCK_H
+#define __LINUX_SPINLOCK_H
+#include <asm/spinlock.h>
+#endif