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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2013 Imagination Technologies Ltd. */
#include <linux/kernel.h>#include <linux/debugfs.h>#include <linux/seq_file.h>#include <asm/cpu.h>#include <asm/debug.h>#include <asm/mipsregs.h>
static void build_segment_config(char *str, unsigned int cfg){ unsigned int am; static const char * const am_str[] = { "UK", "MK", "MSK", "MUSK", "MUSUK", "USK", "RSRVD", "UUSK"};
/* Segment access mode. */ am = (cfg & MIPS_SEGCFG_AM) >> MIPS_SEGCFG_AM_SHIFT; str += sprintf(str, "%-5s", am_str[am]);
/* * Access modes MK, MSK and MUSK are mapped segments. Therefore * there is no direct physical address mapping unless it becomes * unmapped uncached at error level due to EU. */ if ((am == 0) || (am > 3) || (cfg & MIPS_SEGCFG_EU)) str += sprintf(str, " %03lx", ((cfg & MIPS_SEGCFG_PA) >> MIPS_SEGCFG_PA_SHIFT)); else str += sprintf(str, " UND");
if ((am == 0) || (am > 3)) str += sprintf(str, " %01ld", ((cfg & MIPS_SEGCFG_C) >> MIPS_SEGCFG_C_SHIFT)); else str += sprintf(str, " U");
/* Exception configuration. */ str += sprintf(str, " %01ld\n", ((cfg & MIPS_SEGCFG_EU) >> MIPS_SEGCFG_EU_SHIFT));}
static int segments_show(struct seq_file *m, void *v){ unsigned int segcfg; char str[42];
seq_puts(m, "Segment Virtual Size Access Mode Physical Caching EU\n"); seq_puts(m, "------- ------- ---- ----------- -------- ------- --\n");
segcfg = read_c0_segctl0(); build_segment_config(str, segcfg); seq_printf(m, " 0 e0000000 512M %s", str);
segcfg >>= 16; build_segment_config(str, segcfg); seq_printf(m, " 1 c0000000 512M %s", str);
segcfg = read_c0_segctl1(); build_segment_config(str, segcfg); seq_printf(m, " 2 a0000000 512M %s", str);
segcfg >>= 16; build_segment_config(str, segcfg); seq_printf(m, " 3 80000000 512M %s", str);
segcfg = read_c0_segctl2(); build_segment_config(str, segcfg); seq_printf(m, " 4 40000000 1G %s", str);
segcfg >>= 16; build_segment_config(str, segcfg); seq_printf(m, " 5 00000000 1G %s\n", str);
return 0;}DEFINE_SHOW_ATTRIBUTE(segments);
static int __init segments_info(void){ if (cpu_has_segments) debugfs_create_file("segments", S_IRUGO, mips_debugfs_dir, NULL, &segments_fops); return 0;}
device_initcall(segments_info);