94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
|
/*
|
||
|
|
* 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);
|