| 1 | |
| 2 | * This file is subject to the terms and conditions of the GNU General Public
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| 3 | * License. See the file "COPYING" in the main directory of this archive
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| 4 | * for more details.
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| 5 | *
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| 6 | * Copyright (C) 2013 Imagination Technologies Ltd.
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| 7 |
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| 8 |
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| 9 | #include <linux/kernel.h>
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| 10 | #include <linux/debugfs.h>
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| 11 | #include <linux/seq_file.h>
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| 12 | #include <asm/cpu.h>
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| 13 | #include <asm/debug.h>
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| 14 | #include <asm/mipsregs.h>
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| 15 |
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| 16 | static void build_segment_config(char *str, unsigned int cfg)
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| 17 | {
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| 18 | unsigned int am;
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| 19 | static const char * const am_str[] = {
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| 20 | "UK", "MK", "MSK", "MUSK", "MUSUK", "USK",
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| 21 | "RSRVD", "UUSK"};
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| 22 |
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| 23 |
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| 24 | am = (cfg & MIPS_SEGCFG_AM) >> MIPS_SEGCFG_AM_SHIFT;
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| 25 | str += sprintf(str, "%-5s", am_str[am]);
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| 26 |
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| 27 | |
| 28 | * Access modes MK, MSK and MUSK are mapped segments. Therefore
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| 29 | * there is no direct physical address mapping unless it becomes
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| 30 | * unmapped uncached at error level due to EU.
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| 31 |
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| 32 | if ((am == 0) || (am > 3) || (cfg & MIPS_SEGCFG_EU))
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| 33 | str += sprintf(str, " %03lx",
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| 34 | ((cfg & MIPS_SEGCFG_PA) >> MIPS_SEGCFG_PA_SHIFT));
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| 35 | else
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| 36 | str += sprintf(str, " UND");
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| 37 |
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| 38 | if ((am == 0) || (am > 3))
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| 39 | str += sprintf(str, " %01ld",
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| 40 | ((cfg & MIPS_SEGCFG_C) >> MIPS_SEGCFG_C_SHIFT));
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| 41 | else
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| 42 | str += sprintf(str, " U");
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| 43 |
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| 44 |
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| 45 | str += sprintf(str, " %01ld\n",
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| 46 | ((cfg & MIPS_SEGCFG_EU) >> MIPS_SEGCFG_EU_SHIFT));
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| 47 | }
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| 48 |
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| 49 | static int segments_show(struct seq_file *m, void *v)
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| 50 | {
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| 51 | unsigned int segcfg;
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| 52 | char str[42];
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| 53 |
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| 54 | seq_puts(m, "Segment Virtual Size Access Mode Physical Caching EU\n");
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| 55 | seq_puts(m, "------- ------- ---- ----------- -------- ------- --\n");
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| 56 |
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| 57 | segcfg = read_c0_segctl0();
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| 58 | build_segment_config(str, segcfg);
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| 59 | seq_printf(m, " 0 e0000000 512M %s", str);
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| 60 |
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| 61 | segcfg >>= 16;
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| 62 | build_segment_config(str, segcfg);
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| 63 | seq_printf(m, " 1 c0000000 512M %s", str);
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| 64 |
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| 65 | segcfg = read_c0_segctl1();
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| 66 | build_segment_config(str, segcfg);
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| 67 | seq_printf(m, " 2 a0000000 512M %s", str);
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| 68 |
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| 69 | segcfg >>= 16;
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| 70 | build_segment_config(str, segcfg);
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| 71 | seq_printf(m, " 3 80000000 512M %s", str);
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| 72 |
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| 73 | segcfg = read_c0_segctl2();
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| 74 | build_segment_config(str, segcfg);
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| 75 | seq_printf(m, " 4 40000000 1G %s", str);
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| 76 |
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| 77 | segcfg >>= 16;
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| 78 | build_segment_config(str, segcfg);
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| 79 | seq_printf(m, " 5 00000000 1G %s\n", str);
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| 80 |
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| 81 | return 0;
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| 82 | }
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| 83 | DEFINE_SHOW_ATTRIBUTE(segments);
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| 84 |
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| 85 | static int __init segments_info(void)
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| 86 | {
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| 87 | if (cpu_has_segments)
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| 88 | debugfs_create_file("segments", S_IRUGO, mips_debugfs_dir, NULL,
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| 89 | &segments_fops);
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| 90 | return 0;
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| 91 | }
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| 92 |
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| 93 | device_initcall(segments_info);
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