1c348c163SJesse Brandeburg // SPDX-License-Identifier: GPL-2.0-only
2c348c163SJesse Brandeburg /*
3c348c163SJesse Brandeburg * Copyright (C) 2020 Intel Corporation
4c348c163SJesse Brandeburg */
5c348c163SJesse Brandeburg
6c348c163SJesse Brandeburg #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7c348c163SJesse Brandeburg
8c348c163SJesse Brandeburg #include <linux/init.h>
9c348c163SJesse Brandeburg #include <linux/module.h>
10c348c163SJesse Brandeburg #include <linux/printk.h>
11c348c163SJesse Brandeburg
126af132f3SWei Yang /* a tiny module only meant to test
136af132f3SWei Yang *
146af132f3SWei Yang * set/clear_bit
156af132f3SWei Yang * get_count_order/long
166af132f3SWei Yang */
17c348c163SJesse Brandeburg
18*53b0fe36SZhen Lei /* use an enum because that's the most common BITMAP usage */
19c348c163SJesse Brandeburg enum bitops_fun {
20c348c163SJesse Brandeburg BITOPS_4 = 4,
21c348c163SJesse Brandeburg BITOPS_7 = 7,
22c348c163SJesse Brandeburg BITOPS_11 = 11,
23c348c163SJesse Brandeburg BITOPS_31 = 31,
24c348c163SJesse Brandeburg BITOPS_88 = 88,
25c348c163SJesse Brandeburg BITOPS_LAST = 255,
26c348c163SJesse Brandeburg BITOPS_LENGTH = 256
27c348c163SJesse Brandeburg };
28c348c163SJesse Brandeburg
29c348c163SJesse Brandeburg static DECLARE_BITMAP(g_bitmap, BITOPS_LENGTH);
30c348c163SJesse Brandeburg
316af132f3SWei Yang static unsigned int order_comb[][2] = {
326af132f3SWei Yang {0x00000003, 2},
336af132f3SWei Yang {0x00000004, 2},
346af132f3SWei Yang {0x00001fff, 13},
356af132f3SWei Yang {0x00002000, 13},
366af132f3SWei Yang {0x50000000, 31},
376af132f3SWei Yang {0x80000000, 31},
386af132f3SWei Yang {0x80003000, 32},
396af132f3SWei Yang };
406af132f3SWei Yang
416af132f3SWei Yang #ifdef CONFIG_64BIT
426af132f3SWei Yang static unsigned long order_comb_long[][2] = {
436af132f3SWei Yang {0x0000000300000000, 34},
446af132f3SWei Yang {0x0000000400000000, 34},
456af132f3SWei Yang {0x00001fff00000000, 45},
466af132f3SWei Yang {0x0000200000000000, 45},
476af132f3SWei Yang {0x5000000000000000, 63},
486af132f3SWei Yang {0x8000000000000000, 63},
496af132f3SWei Yang {0x8000300000000000, 64},
506af132f3SWei Yang };
516af132f3SWei Yang #endif
526af132f3SWei Yang
test_bitops_startup(void)53c348c163SJesse Brandeburg static int __init test_bitops_startup(void)
54c348c163SJesse Brandeburg {
55403f1773SGeert Uytterhoeven int i, bit_set;
566af132f3SWei Yang
57403f1773SGeert Uytterhoeven pr_info("Starting bitops test\n");
58c348c163SJesse Brandeburg set_bit(BITOPS_4, g_bitmap);
59c348c163SJesse Brandeburg set_bit(BITOPS_7, g_bitmap);
60c348c163SJesse Brandeburg set_bit(BITOPS_11, g_bitmap);
61c348c163SJesse Brandeburg set_bit(BITOPS_31, g_bitmap);
62c348c163SJesse Brandeburg set_bit(BITOPS_88, g_bitmap);
636af132f3SWei Yang
646af132f3SWei Yang for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
656af132f3SWei Yang if (order_comb[i][1] != get_count_order(order_comb[i][0]))
666af132f3SWei Yang pr_warn("get_count_order wrong for %x\n",
676af132f3SWei Yang order_comb[i][0]);
686af132f3SWei Yang }
696af132f3SWei Yang
706af132f3SWei Yang for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
716af132f3SWei Yang if (order_comb[i][1] != get_count_order_long(order_comb[i][0]))
726af132f3SWei Yang pr_warn("get_count_order_long wrong for %x\n",
736af132f3SWei Yang order_comb[i][0]);
746af132f3SWei Yang }
756af132f3SWei Yang
766af132f3SWei Yang #ifdef CONFIG_64BIT
776af132f3SWei Yang for (i = 0; i < ARRAY_SIZE(order_comb_long); i++) {
786af132f3SWei Yang if (order_comb_long[i][1] !=
796af132f3SWei Yang get_count_order_long(order_comb_long[i][0]))
806af132f3SWei Yang pr_warn("get_count_order_long wrong for %lx\n",
816af132f3SWei Yang order_comb_long[i][0]);
826af132f3SWei Yang }
836af132f3SWei Yang #endif
84c348c163SJesse Brandeburg
85403f1773SGeert Uytterhoeven barrier();
86c348c163SJesse Brandeburg
87c348c163SJesse Brandeburg clear_bit(BITOPS_4, g_bitmap);
88c348c163SJesse Brandeburg clear_bit(BITOPS_7, g_bitmap);
89c348c163SJesse Brandeburg clear_bit(BITOPS_11, g_bitmap);
90c348c163SJesse Brandeburg clear_bit(BITOPS_31, g_bitmap);
91c348c163SJesse Brandeburg clear_bit(BITOPS_88, g_bitmap);
92c348c163SJesse Brandeburg
93c348c163SJesse Brandeburg bit_set = find_first_bit(g_bitmap, BITOPS_LAST);
94c348c163SJesse Brandeburg if (bit_set != BITOPS_LAST)
95c348c163SJesse Brandeburg pr_err("ERROR: FOUND SET BIT %d\n", bit_set);
96c348c163SJesse Brandeburg
97403f1773SGeert Uytterhoeven pr_info("Completed bitops test\n");
98403f1773SGeert Uytterhoeven
99403f1773SGeert Uytterhoeven return 0;
100403f1773SGeert Uytterhoeven }
101403f1773SGeert Uytterhoeven
test_bitops_unstartup(void)102403f1773SGeert Uytterhoeven static void __exit test_bitops_unstartup(void)
103403f1773SGeert Uytterhoeven {
104c348c163SJesse Brandeburg }
105c348c163SJesse Brandeburg
106c348c163SJesse Brandeburg module_init(test_bitops_startup);
107c348c163SJesse Brandeburg module_exit(test_bitops_unstartup);
108c348c163SJesse Brandeburg
1096af132f3SWei Yang MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>, Wei Yang <richard.weiyang@gmail.com>");
110c348c163SJesse Brandeburg MODULE_LICENSE("GPL");
111c348c163SJesse Brandeburg MODULE_DESCRIPTION("Bit testing module");
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