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104 lines
2.8 KiB
104 lines
2.8 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 2013 Imagination Technologies Ltd. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/debugfs.h> |
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#include <linux/seq_file.h> |
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#include <asm/cpu.h> |
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#include <asm/debug.h> |
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#include <asm/mipsregs.h> |
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static void build_segment_config(char *str, unsigned int cfg) |
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{ |
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unsigned int am; |
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static const char * const am_str[] = { |
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"UK", "MK", "MSK", "MUSK", "MUSUK", "USK", |
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"RSRVD", "UUSK"}; |
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/* Segment access mode. */ |
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am = (cfg & MIPS_SEGCFG_AM) >> MIPS_SEGCFG_AM_SHIFT; |
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str += sprintf(str, "%-5s", am_str[am]); |
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/* |
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* Access modes MK, MSK and MUSK are mapped segments. Therefore |
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* there is no direct physical address mapping unless it becomes |
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* unmapped uncached at error level due to EU. |
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*/ |
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if ((am == 0) || (am > 3) || (cfg & MIPS_SEGCFG_EU)) |
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str += sprintf(str, " %03lx", |
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((cfg & MIPS_SEGCFG_PA) >> MIPS_SEGCFG_PA_SHIFT)); |
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else |
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str += sprintf(str, " UND"); |
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if ((am == 0) || (am > 3)) |
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str += sprintf(str, " %01ld", |
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((cfg & MIPS_SEGCFG_C) >> MIPS_SEGCFG_C_SHIFT)); |
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else |
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str += sprintf(str, " U"); |
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/* Exception configuration. */ |
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str += sprintf(str, " %01ld\n", |
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((cfg & MIPS_SEGCFG_EU) >> MIPS_SEGCFG_EU_SHIFT)); |
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} |
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static int show_segments(struct seq_file *m, void *v) |
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{ |
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unsigned int segcfg; |
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char str[42]; |
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seq_puts(m, "Segment Virtual Size Access Mode Physical Caching EU\n"); |
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seq_puts(m, "------- ------- ---- ----------- -------- ------- --\n"); |
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segcfg = read_c0_segctl0(); |
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build_segment_config(str, segcfg); |
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seq_printf(m, " 0 e0000000 512M %s", str); |
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segcfg >>= 16; |
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build_segment_config(str, segcfg); |
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seq_printf(m, " 1 c0000000 512M %s", str); |
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segcfg = read_c0_segctl1(); |
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build_segment_config(str, segcfg); |
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seq_printf(m, " 2 a0000000 512M %s", str); |
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segcfg >>= 16; |
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build_segment_config(str, segcfg); |
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seq_printf(m, " 3 80000000 512M %s", str); |
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segcfg = read_c0_segctl2(); |
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build_segment_config(str, segcfg); |
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seq_printf(m, " 4 40000000 1G %s", str); |
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segcfg >>= 16; |
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build_segment_config(str, segcfg); |
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seq_printf(m, " 5 00000000 1G %s\n", str); |
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return 0; |
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} |
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static int segments_open(struct inode *inode, struct file *file) |
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{ |
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return single_open(file, show_segments, NULL); |
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} |
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static const struct file_operations segments_fops = { |
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.open = segments_open, |
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.read = seq_read, |
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.llseek = seq_lseek, |
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.release = single_release, |
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}; |
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static int __init segments_info(void) |
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{ |
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if (cpu_has_segments) |
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debugfs_create_file("segments", S_IRUGO, mips_debugfs_dir, NULL, |
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&segments_fops); |
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return 0; |
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} |
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device_initcall(segments_info);
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