1 /* 2 * This header tries to allow you to write 2.3-compatible drivers, 3 * but (using this header) still allows you to run them on 2.2 and 4 * 2.0 kernels. 5 * 6 * Sometimes, a #define replaces a "construct" that older kernels 7 * had. For example, 8 * 9 * DECLARE_MUTEX(name); 10 * 11 * replaces the older 12 * 13 * struct semaphore name = MUTEX; 14 * 15 * This file then declares the DECLARE_MUTEX macro to compile into the 16 * older version. 17 * 18 * In some cases, a macro or function changes the number of arguments. 19 * In that case, there is nothing we can do except define an access 20 * macro that provides the same functionality on both versions of Linux. 21 * 22 * This is the case for example with the "get_user" macro 2.0 kernels use: 23 * 24 * a = get_user (b); 25 * 26 * while newer kernels use 27 * 28 * get_user (a,b); 29 * 30 * This is unfortunate. We therefore define "Get_user (a,b)" which looks 31 * almost the same as the 2.2+ construct, and translates into the 32 * appropriate sequence for earlier constructs. 33 * 34 * Supported by this file are the 2.0 kernels, 2.2 kernels, and the 35 * most recent 2.3 kernel. 2.3 support will be dropped as soon when 2.4 36 * comes out. 2.0 support may someday be dropped. But then again, maybe 37 * not. 38 * 39 * I'll try to maintain this, provided that Linus agrees with the setup. 40 * Feel free to mail updates or suggestions. 41 * 42 * -- R.E.Wolff@BitWizard.nl 43 * 44 */ 45 46#ifndef COMPATMAC_H 47#define COMPATMAC_H 48 49#include <linux/version.h> 50 51#if LINUX_VERSION_CODE < 0x020100 /* Less than 2.1.0 */ 52#define TWO_ZERO 53#else 54#if LINUX_VERSION_CODE < 0x020200 /* less than 2.2.x */ 55#warning "Please use a 2.2.x kernel. " 56#else 57#if LINUX_VERSION_CODE < 0x020300 /* less than 2.3.x */ 58#define TWO_TWO 59#else 60#define TWO_THREE 61#endif 62#endif 63#endif 64 65#ifdef TWO_ZERO 66 67/* Here is the section that makes the 2.2 compatible driver source 68 work for 2.0 too! We mostly try to adopt the "new thingies" from 2.2, 69 and provide for compatibility stuff here if possible. */ 70 71/* Some 200 days (on intel) */ 72#define MAX_SCHEDULE_TIMEOUT ((long)(~0UL>>1)) 73 74#include <linux/bios32.h> 75 76#define Get_user(a,b) a = get_user(b) 77#define Put_user(a,b) 0,put_user(a,b) 78#define copy_to_user(a,b,c) memcpy_tofs(a,b,c) 79 80static inline int copy_from_user(void *to,const void *from, int c) 81{ 82 memcpy_fromfs(to, from, c); 83 return 0; 84} 85 86#define pci_present pcibios_present 87#define pci_read_config_word pcibios_read_config_word 88#define pci_read_config_dword pcibios_read_config_dword 89 90static inline unsigned char get_irq (unsigned char bus, unsigned char fn) 91{ 92 unsigned char t; 93 pcibios_read_config_byte (bus, fn, PCI_INTERRUPT_LINE, &t); 94 return t; 95} 96 97static inline void *ioremap(unsigned long base, long length) 98{ 99 if (base < 0x100000) return (void *)base; 100 return vremap (base, length); 101} 102 103#define my_iounmap(x, b) (((long)x<0x100000)?0:vfree ((void*)x)) 104 105#define capable(x) suser() 106 107#define tty_flip_buffer_push(tty) queue_task(&tty->flip.tqueue, &tq_timer) 108#define signal_pending(current) (current->signal & ~current->blocked) 109#define schedule_timeout(to) do {current->timeout = jiffies + (to);schedule ();} while (0) 110#define time_after(t1,t2) (((long)t1-t2) > 0) 111 112 113#define test_and_set_bit(nr, addr) set_bit(nr, addr) 114#define test_and_clear_bit(nr, addr) clear_bit(nr, addr) 115 116/* Not yet implemented on 2.0 */ 117#define ASYNC_SPD_SHI -1 118#define ASYNC_SPD_WARP -1 119 120 121/* Ugly hack: the driver_name doesn't exist in 2.0.x . So we define it 122 to the "name" field that does exist. As long as the assignments are 123 done in the right order, there is nothing to worry about. */ 124#define driver_name name 125 126/* Should be in a header somewhere. They are in tty.h on 2.2 */ 127#define TTY_HW_COOK_OUT 14 /* Flag to tell ntty what we can handle */ 128#define TTY_HW_COOK_IN 15 /* in hardware - output and input */ 129 130/* The return type of a "close" routine. */ 131#define INT void 132#define NO_ERROR /* Nothing */ 133 134#else 135 136/* The 2.2.x compatibility section. */ 137#include <asm/uaccess.h> 138 139 140#define Get_user(a,b) get_user(a,b) 141#define Put_user(a,b) put_user(a,b) 142#define get_irq(pdev) pdev->irq 143 144#define INT int 145#define NO_ERROR 0 146 147#define my_iounmap(x,b) (iounmap((char *)(b))) 148 149#endif 150 151#ifndef TWO_THREE 152/* These are new in 2.3. The source now uses 2.3 syntax, and here is 153 the compatibility define... */ 154#define wait_queue_head_t struct wait_queue * 155#define DECLARE_MUTEX(name) struct semaphore name = MUTEX 156#define DECLARE_WAITQUEUE(wait, current) \ 157 struct wait_queue wait = { current, NULL } 158 159#endif 160 161 162#endif 163