1/*
2 * arch/blackfin/kernel/kgdb_test.c - Blackfin kgdb tests
3 *
4 * Copyright 2005-2008 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/proc_fs.h>
13
14#include <asm/current.h>
15#include <asm/uaccess.h>
16
17#include <asm/blackfin.h>
18
19/* Symbols are here for kgdb test to poke directly */
20static char cmdline[256];
21static size_t len;
22
23#ifndef CONFIG_SMP
24static int num1 __attribute__((l1_data));
25
26void kgdb_l1_test(void) __attribute__((l1_text));
27
28void kgdb_l1_test(void)
29{
30	pr_alert("L1(before change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
31	pr_alert("L1 : code function addr = 0x%p\n", kgdb_l1_test);
32	num1 = num1 + 10;
33	pr_alert("L1(after change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
34}
35#endif
36
37#if L2_LENGTH
38
39static int num2 __attribute__((l2));
40void kgdb_l2_test(void) __attribute__((l2));
41
42void kgdb_l2_test(void)
43{
44	pr_alert("L2(before change) : data variable addr = 0x%p, data value is %d\n", &num2, num2);
45	pr_alert("L2 : code function addr = 0x%p\n", kgdb_l2_test);
46	num2 = num2 + 20;
47	pr_alert("L2(after change) : data variable addr = 0x%p, data value is %d\n", &num2, num2);
48}
49
50#endif
51
52noinline int kgdb_test(char *name, int len, int count, int z)
53{
54	pr_alert("kgdb name(%d): %s, %d, %d\n", len, name, count, z);
55	count = z;
56	return count;
57}
58
59static ssize_t
60kgdb_test_proc_read(struct file *file, char __user *buf,
61                    size_t count, loff_t *ppos)
62{
63	kgdb_test("hello world!", 12, 0x55, 0x10);
64#ifndef CONFIG_SMP
65	kgdb_l1_test();
66#endif
67#if L2_LENGTH
68	kgdb_l2_test();
69#endif
70
71	return 0;
72}
73
74static ssize_t
75kgdb_test_proc_write(struct file *file, const char __user *buffer,
76                     size_t count, loff_t *pos)
77{
78	len = min_t(size_t, 255, count);
79	memcpy(cmdline, buffer, count);
80	cmdline[len] = 0;
81
82	return len;
83}
84
85static const struct file_operations kgdb_test_proc_fops = {
86	.owner = THIS_MODULE,
87	.read  = kgdb_test_proc_read,
88	.write = kgdb_test_proc_write,
89	.llseek = noop_llseek,
90};
91
92static int __init kgdbtest_init(void)
93{
94	struct proc_dir_entry *entry;
95
96#if L2_LENGTH
97	num2 = 0;
98#endif
99
100	entry = proc_create("kgdbtest", 0, NULL, &kgdb_test_proc_fops);
101	if (entry == NULL)
102		return -ENOMEM;
103
104	return 0;
105}
106
107static void __exit kgdbtest_exit(void)
108{
109	remove_proc_entry("kgdbtest", NULL);
110}
111
112module_init(kgdbtest_init);
113module_exit(kgdbtest_exit);
114MODULE_LICENSE("GPL");
115