1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2018, Christophe Leroy CS S.I.
4*4882a593Smuzhiyun * <christophe.leroy@c-s.fr>
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * This dumps the content of Segment Registers
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <asm/debugfs.h>
10*4882a593Smuzhiyun
seg_show(struct seq_file * m,int i)11*4882a593Smuzhiyun static void seg_show(struct seq_file *m, int i)
12*4882a593Smuzhiyun {
13*4882a593Smuzhiyun u32 val = mfsrin(i << 28);
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun seq_printf(m, "0x%01x0000000-0x%01xfffffff ", i, i);
16*4882a593Smuzhiyun seq_printf(m, "Kern key %d ", (val >> 30) & 1);
17*4882a593Smuzhiyun seq_printf(m, "User key %d ", (val >> 29) & 1);
18*4882a593Smuzhiyun if (val & 0x80000000) {
19*4882a593Smuzhiyun seq_printf(m, "Device 0x%03x", (val >> 20) & 0x1ff);
20*4882a593Smuzhiyun seq_printf(m, "-0x%05x", val & 0xfffff);
21*4882a593Smuzhiyun } else {
22*4882a593Smuzhiyun if (val & 0x10000000)
23*4882a593Smuzhiyun seq_puts(m, "No Exec ");
24*4882a593Smuzhiyun seq_printf(m, "VSID 0x%06x", val & 0xffffff);
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun seq_puts(m, "\n");
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
sr_show(struct seq_file * m,void * v)29*4882a593Smuzhiyun static int sr_show(struct seq_file *m, void *v)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun int i;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun seq_puts(m, "---[ User Segments ]---\n");
34*4882a593Smuzhiyun for (i = 0; i < TASK_SIZE >> 28; i++)
35*4882a593Smuzhiyun seg_show(m, i);
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun seq_puts(m, "\n---[ Kernel Segments ]---\n");
38*4882a593Smuzhiyun for (; i < 16; i++)
39*4882a593Smuzhiyun seg_show(m, i);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun return 0;
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
sr_open(struct inode * inode,struct file * file)44*4882a593Smuzhiyun static int sr_open(struct inode *inode, struct file *file)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun return single_open(file, sr_show, NULL);
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun static const struct file_operations sr_fops = {
50*4882a593Smuzhiyun .open = sr_open,
51*4882a593Smuzhiyun .read = seq_read,
52*4882a593Smuzhiyun .llseek = seq_lseek,
53*4882a593Smuzhiyun .release = single_release,
54*4882a593Smuzhiyun };
55*4882a593Smuzhiyun
sr_init(void)56*4882a593Smuzhiyun static int __init sr_init(void)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun debugfs_create_file("segment_registers", 0400, powerpc_debugfs_root,
59*4882a593Smuzhiyun NULL, &sr_fops);
60*4882a593Smuzhiyun return 0;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun device_initcall(sr_init);
63