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