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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>
111 lines
2.8 KiB
C
111 lines
2.8 KiB
C
/*
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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/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.
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*/
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if ((am == 0) || (am > 3)) {
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str += sprintf(str, " %03lx",
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((cfg & MIPS_SEGCFG_PA) >> MIPS_SEGCFG_PA_SHIFT));
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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, " UND");
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str += sprintf(str, " U");
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}
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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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extern struct dentry *mips_debugfs_dir;
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struct dentry *segments;
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if (cpu_has_segments) {
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if (!mips_debugfs_dir)
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return -ENODEV;
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segments = debugfs_create_file("segments", S_IRUGO,
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mips_debugfs_dir, NULL,
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&segments_fops);
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if (!segments)
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return -ENOMEM;
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}
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return 0;
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}
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device_initcall(segments_info);
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