powerpc/mm: dump segment registers on book3s/32

obj-$(CONFIG_4xx)		+= dump_linuxpagetables-generic.o

obj-$(CONFIG_PPC_8xx)		+= dump_linuxpagetables-8xx.o

obj-$(CONFIG_PPC_BOOK3E_MMU)	+= dump_linuxpagetables-generic.o

obj-$(CONFIG_PPC_BOOK3S_32)	+= dump_linuxpagetables-generic.o

obj-$(CONFIG_PPC_BOOK3S_32)	+= dump_linuxpagetables-generic.o dump_sr.o

obj-$(CONFIG_PPC_BOOK3S_64)	+= dump_linuxpagetables-book3s64.o

endif

obj-$(CONFIG_PPC_HTDUMP)	+= dump_hashpagetable.o

// 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);