projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 29f9087c SH |
1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public | |
| 3 | * License. See the file "COPYING" in the main directory of this archive | |
| 4 | * for more details. | |
| 5 | * | |
| 6 | * Copyright (C) 2013 Imagination Technologies Ltd. | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/kernel.h> | |
| 10 | #include <linux/debugfs.h> | |
| 11 | #include <linux/seq_file.h> | |
| 12 | #include <asm/cpu.h> | |
| 13 | #include <asm/mipsregs.h> | |
| 14 | ||
| 15 | static void build_segment_config(char *str, unsigned int cfg) | |
| 16 | { | |
| 17 | unsigned int am; | |
| 18 | static const char * const am_str[] = { | |
| 19 | "UK", "MK", "MSK", "MUSK", "MUSUK", "USK", | |
| 20 | "RSRVD", "UUSK"}; | |
| 21 | ||
| 22 | /* Segment access mode. */ | |
| 23 | am = (cfg & MIPS_SEGCFG_AM) >> MIPS_SEGCFG_AM_SHIFT; | |
| 24 | str += sprintf(str, "%-5s", am_str[am]); | |
| 25 | ||
| 26 | /* | |
| 27 | * Access modes MK, MSK and MUSK are mapped segments. Therefore | |
| 28 | * there is no direct physical address mapping. | |
| 29 | */ | |
| 30 | if ((am == 0) || (am > 3)) { | |
| 31 | str += sprintf(str, " %03lx", | |
| 32 | ((cfg & MIPS_SEGCFG_PA) >> MIPS_SEGCFG_PA_SHIFT)); | |
| 33 | str += sprintf(str, " %01ld", | |
| 34 | ((cfg & MIPS_SEGCFG_C) >> MIPS_SEGCFG_C_SHIFT)); | |
| 35 | } else { | |
| 36 | str += sprintf(str, " UND"); | |
| 37 | str += sprintf(str, " U"); | |
| 38 | } | |
| 39 | ||
| 40 | /* Exception configuration. */ | |
| 41 | str += sprintf(str, " %01ld\n", | |
| 42 | ((cfg & MIPS_SEGCFG_EU) >> MIPS_SEGCFG_EU_SHIFT)); | |
| 43 | } | |
| 44 | ||
| 45 | static int show_segments(struct seq_file *m, void *v) | |
| 46 | { | |
| 47 | unsigned int segcfg; | |
| 48 | char str[42]; | |
| 49 | ||
| 50 | seq_puts(m, "Segment Virtual Size Access Mode Physical Caching EU\n"); | |
| 51 | seq_puts(m, "------- ------- ---- ----------- -------- ------- --\n"); | |
| 52 | ||
| 53 | segcfg = read_c0_segctl0(); | |
| 54 | build_segment_config(str, segcfg); | |
| 55 | seq_printf(m, " 0 e0000000 512M %s", str); | |
| 56 | ||
| 57 | segcfg >>= 16; | |
| 58 | build_segment_config(str, segcfg); | |
| 59 | seq_printf(m, " 1 c0000000 512M %s", str); | |
| 60 | ||
| 61 | segcfg = read_c0_segctl1(); | |
| 62 | build_segment_config(str, segcfg); | |
| 63 | seq_printf(m, " 2 a0000000 512M %s", str); | |
| 64 | ||
| 65 | segcfg >>= 16; | |
| 66 | build_segment_config(str, segcfg); | |
| 67 | seq_printf(m, " 3 80000000 512M %s", str); | |
| 68 | ||
| 69 | segcfg = read_c0_segctl2(); | |
| 70 | build_segment_config(str, segcfg); | |
| 71 | seq_printf(m, " 4 40000000 1G %s", str); | |
| 72 | ||
| 73 | segcfg >>= 16; | |
| 74 | build_segment_config(str, segcfg); | |
| 75 | seq_printf(m, " 5 00000000 1G %s\n", str); | |
| 76 | ||
| 77 | return 0; | |
| 78 | } | |
| 79 | ||
| 80 | static int segments_open(struct inode *inode, struct file *file) | |
| 81 | { | |
| 82 | return single_open(file, show_segments, NULL); | |
| 83 | } | |
| 84 | ||
| 85 | static const struct file_operations segments_fops = { | |
| 86 | .open = segments_open, | |
| 87 | .read = seq_read, | |
| 88 | .llseek = seq_lseek, | |
| 89 | .release = single_release, | |
| 90 | }; | |
| 91 | ||
| 92 | static int __init segments_info(void) | |
| 93 | { | |
| 94 | extern struct dentry *mips_debugfs_dir; | |
| 95 | struct dentry *segments; | |
| 96 | ||
| 97 | if (cpu_has_segments) { | |
| 98 | if (!mips_debugfs_dir) | |
| 99 | return -ENODEV; | |
| 100 | ||
| 101 | segments = debugfs_create_file("segments", S_IRUGO, | |
| 102 | mips_debugfs_dir, NULL, | |
| 103 | &segments_fops); | |
| 104 | if (!segments) | |
| 105 | return -ENOMEM; | |
| 106 | } | |
| 107 | return 0; | |
| 108 | } | |
| 109 | ||
| 110 | device_initcall(segments_info); |