patch-2.3.99-pre1 linux/include/linux/compatmac.h

• Lines: 164
• Date: Sun Mar 12 19:18:55 2000
• Orig file: v2.3.51/linux/include/linux/compatmac.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.51/linux/include/linux/compatmac.h linux/include/linux/compatmac.h
@@ -0,0 +1,163 @@
+  /* 
+   * 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
+
+#ifndef TWO_THREE
+/* These are new in 2.3. The source now uses 2.3 syntax, and here is 
+   the compatibility define... */
+#define wait_queue_head_t     struct wait_queue *
+#define DECLARE_MUTEX(name)   struct semaphore name = MUTEX
+#define DECLARE_WAITQUEUE(wait, current) \
+                              struct wait_queue wait = { current, NULL }
+
+#endif
+
+
+#endif