29f9087c52
Add a new mips/segments debugfs file to print the 6 segmentation control registers for supported cores. A sample from a proAptiv core is given below: Signed-off-by: John Crispin <blogic@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/6137/ Segment Virtual Size Access Mode Physical Caching EU ------- ------- ---- ----------- -------- ------- -- 0 e0000000 512M MK UND U 0 1 c0000000 512M MSK UND U 0 2 a0000000 512M UK 000 2 0 3 80000000 512M UK 000 3 0 4 40000000 1G MUSK UND U 1 5 00000000 1G MUSK UND U 1 Reviewed-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com> Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
110 lines
2.8 KiB
C
110 lines
2.8 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/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.
|
|
*/
|
|
if ((am == 0) || (am > 3)) {
|
|
str += sprintf(str, " %03lx",
|
|
((cfg & MIPS_SEGCFG_PA) >> MIPS_SEGCFG_PA_SHIFT));
|
|
str += sprintf(str, " %01ld",
|
|
((cfg & MIPS_SEGCFG_C) >> MIPS_SEGCFG_C_SHIFT));
|
|
} else {
|
|
str += sprintf(str, " UND");
|
|
str += sprintf(str, " U");
|
|
}
|
|
|
|
/* Exception configuration. */
|
|
str += sprintf(str, " %01ld\n",
|
|
((cfg & MIPS_SEGCFG_EU) >> MIPS_SEGCFG_EU_SHIFT));
|
|
}
|
|
|
|
static int show_segments(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;
|
|
}
|
|
|
|
static int segments_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, show_segments, NULL);
|
|
}
|
|
|
|
static const struct file_operations segments_fops = {
|
|
.open = segments_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int __init segments_info(void)
|
|
{
|
|
extern struct dentry *mips_debugfs_dir;
|
|
struct dentry *segments;
|
|
|
|
if (cpu_has_segments) {
|
|
if (!mips_debugfs_dir)
|
|
return -ENODEV;
|
|
|
|
segments = debugfs_create_file("segments", S_IRUGO,
|
|
mips_debugfs_dir, NULL,
|
|
&segments_fops);
|
|
if (!segments)
|
|
return -ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(segments_info);
|