devtime.c (1053:2c6d9e60541b) devtime.c (1068:6330fe678283)
1/*
2 * Copyright (c) 2004 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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43#endif
44
45#define DRIVER_AUTHOR "Ali Saidi"
46#define DRIVER_DESC "Interface to time uncacachable read and writes to device registers"
47#define DRIVER_VER "0.1"
48
49static char *dataAddr = NULL;
50static int count = 0;
1/*
2 * Copyright (c) 2004 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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43#endif
44
45#define DRIVER_AUTHOR "Ali Saidi"
46#define DRIVER_DESC "Interface to time uncacachable read and writes to device registers"
47#define DRIVER_VER "0.1"
48
49static char *dataAddr = NULL;
50static int count = 0;
51#ifdef __alpha__
52static int memTest = 0;
53#endif
51
52static inline uint32_t cycleCounter(uint32_t dep);
53
54static int __init devtime_start(void)
55{
56 uint64_t addr;
57 uint32_t t1, t2;
58 uint32_t trash;
59 int x;
60 uint32_t *times;
61 uint32_t num = 0;
62 struct net_device *dev;
63
64 printk("Devtime Driver Version %s Loaded...\n", DRIVER_VER);
65
54
55static inline uint32_t cycleCounter(uint32_t dep);
56
57static int __init devtime_start(void)
58{
59 uint64_t addr;
60 uint32_t t1, t2;
61 uint32_t trash;
62 int x;
63 uint32_t *times;
64 uint32_t num = 0;
65 struct net_device *dev;
66
67 printk("Devtime Driver Version %s Loaded...\n", DRIVER_VER);
68
69#ifdef __alpha__
70 if (memTest) {
71 addr = 0xfffffc0000000000;
72// addr += 16*1024*1024;
73
74 printk("Preparing memory test.\n");
75
76 t1 = cycleCounter(trash);
77 for (x = 0; x < count; x++) {
78 trash = readl(addr);
79 t2 = cycleCounter(trash);
80 times[num++] = t2 - t1;
81 t1 = t2;
82 addr += 4096;
83 }
84
85 printk("Measurements:\n");
86 for (x = 0; x < count; x++) {
87 printk("%d ", times[x]);
88 if (((x + 1) % 10) == 0)
89 printk("\n");
90 }
91 printk("\nDone.\n");
92 } else
93#endif
66 if (dataAddr != 0 && count != 0) {
67 addr = simple_strtoull(dataAddr, NULL, 0);
68
69 addr = ioremap(addr, PAGE_SIZE);
70 /**
71 * Make sure that the remapping actually worked. On alpha we have
72 * linear addressing, so its not a problem. But it can fail in x86
73 * if physical memory is mapped to this address.

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140
141inline uint32_t cycleCounter(uint32_t dep)
142{
143 uint32_t res;
144 asm volatile ("rpcc %0, %1" : "=r"(res) : "r" (dep) : "memory");
145 return res;
146}
147#else
94 if (dataAddr != 0 && count != 0) {
95 addr = simple_strtoull(dataAddr, NULL, 0);
96
97 addr = ioremap(addr, PAGE_SIZE);
98 /**
99 * Make sure that the remapping actually worked. On alpha we have
100 * linear addressing, so its not a problem. But it can fail in x86
101 * if physical memory is mapped to this address.

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168
169inline uint32_t cycleCounter(uint32_t dep)
170{
171 uint32_t res;
172 asm volatile ("rpcc %0, %1" : "=r"(res) : "r" (dep) : "memory");
173 return res;
174}
175#else
148#error Architecture NOT SUPPORTE
176#error Architecture NOT SUPPORTED
149#endif
150
151static void __exit devtime_end(void)
152{
153 printk("Devtime Driver Version %s Unloaded...\n", DRIVER_VER);
154}
155
156
157module_init(devtime_start);
158module_exit(devtime_end);
159
160MODULE_LICENSE("Dual BSD/GPL");
161MODULE_AUTHOR(DRIVER_AUTHOR);
162MODULE_DESCRIPTION(DRIVER_DESC);
163module_param(dataAddr, charp, 0);
164module_param(count, int, 0);
177#endif
178
179static void __exit devtime_end(void)
180{
181 printk("Devtime Driver Version %s Unloaded...\n", DRIVER_VER);
182}
183
184
185module_init(devtime_start);
186module_exit(devtime_end);
187
188MODULE_LICENSE("Dual BSD/GPL");
189MODULE_AUTHOR(DRIVER_AUTHOR);
190MODULE_DESCRIPTION(DRIVER_DESC);
191module_param(dataAddr, charp, 0);
192module_param(count, int, 0);
193#ifdef __alpha__
194module_param(memTest, int, 0);
195#endif