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| 3 | * Copyright (C) 2020 Intel Corporation
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| 4 |
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| 5 |
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| 6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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| 7 |
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| 8 | #include <linux/init.h>
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| 9 | #include <linux/module.h>
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| 10 | #include <linux/printk.h>
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| 11 |
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| 12 | |
| 13 | *
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| 14 | * set/clear_bit
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| 15 | * get_count_order/long
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| 16 |
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| 17 |
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| 18 |
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| 19 | enum bitops_fun {
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| 20 | BITOPS_4 = 4,
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| 21 | BITOPS_7 = 7,
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| 22 | BITOPS_11 = 11,
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| 23 | BITOPS_31 = 31,
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| 24 | BITOPS_88 = 88,
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| 25 | BITOPS_LAST = 255,
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| 26 | BITOPS_LENGTH = 256
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| 27 | };
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| 28 |
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| 29 | static DECLARE_BITMAP(g_bitmap, BITOPS_LENGTH);
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| 30 |
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| 31 | static unsigned int order_comb[][2] = {
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| 32 | {0x00000003, 2},
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| 33 | {0x00000004, 2},
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| 34 | {0x00001fff, 13},
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| 35 | {0x00002000, 13},
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| 36 | {0x50000000, 31},
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| 37 | {0x80000000, 31},
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| 38 | {0x80003000, 32},
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| 39 | };
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| 40 |
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| 41 | #ifdef CONFIG_64BIT
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| 42 | static unsigned long order_comb_long[][2] = {
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| 43 | {0x0000000300000000, 34},
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| 44 | {0x0000000400000000, 34},
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| 45 | {0x00001fff00000000, 45},
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| 46 | {0x0000200000000000, 45},
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| 47 | {0x5000000000000000, 63},
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| 48 | {0x8000000000000000, 63},
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| 49 | {0x8000300000000000, 64},
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| 50 | };
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| 51 | #endif
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| 52 |
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| 53 | static int __init test_bitops_startup(void)
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| 54 | {
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| 55 | int i, bit_set;
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| 56 |
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| 57 | pr_info("Starting bitops test\n");
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| 58 | set_bit(BITOPS_4, g_bitmap);
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| 59 | set_bit(BITOPS_7, g_bitmap);
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| 60 | set_bit(BITOPS_11, g_bitmap);
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| 61 | set_bit(BITOPS_31, g_bitmap);
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| 62 | set_bit(BITOPS_88, g_bitmap);
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| 63 |
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| 64 | for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
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| 65 | if (order_comb[i][1] != get_count_order(order_comb[i][0]))
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| 66 | pr_warn("get_count_order wrong for %x\n",
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| 67 | order_comb[i][0]);
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| 68 | }
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| 69 |
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| 70 | for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
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| 71 | if (order_comb[i][1] != get_count_order_long(order_comb[i][0]))
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| 72 | pr_warn("get_count_order_long wrong for %x\n",
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| 73 | order_comb[i][0]);
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| 74 | }
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| 75 |
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| 76 | #ifdef CONFIG_64BIT
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| 77 | for (i = 0; i < ARRAY_SIZE(order_comb_long); i++) {
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| 78 | if (order_comb_long[i][1] !=
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| 79 | get_count_order_long(order_comb_long[i][0]))
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| 80 | pr_warn("get_count_order_long wrong for %lx\n",
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| 81 | order_comb_long[i][0]);
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| 82 | }
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| 83 | #endif
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| 84 |
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| 85 | barrier();
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| 86 |
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| 87 | clear_bit(BITOPS_4, g_bitmap);
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| 88 | clear_bit(BITOPS_7, g_bitmap);
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| 89 | clear_bit(BITOPS_11, g_bitmap);
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| 90 | clear_bit(BITOPS_31, g_bitmap);
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| 91 | clear_bit(BITOPS_88, g_bitmap);
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| 92 |
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| 93 | bit_set = find_first_bit(g_bitmap, BITOPS_LAST);
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| 94 | if (bit_set != BITOPS_LAST)
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| 95 | pr_err("ERROR: FOUND SET BIT %d\n", bit_set);
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| 96 |
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| 97 | pr_info("Completed bitops test\n");
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| 98 |
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| 99 | return 0;
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| 100 | }
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| 101 |
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| 102 | static void __exit test_bitops_unstartup(void)
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| 103 | {
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| 104 | }
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| 105 |
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| 106 | module_init(test_bitops_startup);
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| 107 | module_exit(test_bitops_unstartup);
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| 108 |
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| 109 | MODULE_AUTHOR("Jesse Brandeburg <[email protected]>, Wei Yang <[email protected]>");
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| 110 | MODULE_LICENSE("GPL");
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| 111 | MODULE_DESCRIPTION("Bit testing module");
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