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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018, Christophe Leroy CS S.I.
* <christophe.leroy@c-s.fr>
*
* This dumps the content of Segment Registers
*/
#include <asm/debugfs.h>
static void seg_show(struct seq_file *m, int i)
{
u32 val = mfsrin(i << 28);
seq_printf(m, "0x%01x0000000-0x%01xfffffff ", i, i);
seq_printf(m, "Kern key %d ", (val >> 30) & 1);
seq_printf(m, "User key %d ", (val >> 29) & 1);
if (val & 0x80000000) {
seq_printf(m, "Device 0x%03x", (val >> 20) & 0x1ff);
seq_printf(m, "-0x%05x", val & 0xfffff);
} else {
if (val & 0x10000000)
seq_puts(m, "No Exec ");
seq_printf(m, "VSID 0x%06x", val & 0xffffff);
}
seq_puts(m, "\n");
}
static int sr_show(struct seq_file *m, void *v)
{
int i;
seq_puts(m, "---[ User Segments ]---\n");
for (i = 0; i < TASK_SIZE >> 28; i++)
seg_show(m, i);
seq_puts(m, "\n---[ Kernel Segments ]---\n");
for (; i < 16; i++)
seg_show(m, i);
return 0;
}
static int sr_open(struct inode *inode, struct file *file)
{
return single_open(file, sr_show, NULL);
}
static const struct file_operations sr_fops = {
.open = sr_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init sr_init(void)
{
struct dentry *debugfs_file;
debugfs_file = debugfs_create_file("segment_registers", 0400,
powerpc_debugfs_root, NULL, &sr_fops);
return debugfs_file ? 0 : -ENOMEM;
}
device_initcall(sr_init);
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