[mirror_ubuntu-jammy-kernel.git] / fs / proc / nommu.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* nommu.c: mmu-less memory info files
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mman.h>
#include <linux/proc_fs.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/seq_file.h>
#include <linux/hugetlb.h>
#include <linux/vmalloc.h>
#include <linux/uaccess.h>
#include <asm/pgtable.h>
#include <asm/tlb.h>
#include <asm/div64.h>
#include "internal.h"

/*
 * display a single region to a sequenced file
 */
static int nommu_region_show(struct seq_file *m, struct vm_region *region)
{
	unsigned long ino = 0;
	struct file *file;
	dev_t dev = 0;
	int flags;

	flags = region->vm_flags;
	file = region->vm_file;

	if (file) {
		struct inode *inode = file_inode(region->vm_file);
		dev = inode->i_sb->s_dev;
		ino = inode->i_ino;
	}

	seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
	seq_printf(m,
		   "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
		   region->vm_start,
		   region->vm_end,
		   flags & VM_READ ? 'r' : '-',
		   flags & VM_WRITE ? 'w' : '-',
		   flags & VM_EXEC ? 'x' : '-',
		   flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
		   ((loff_t)region->vm_pgoff) << PAGE_SHIFT,
		   MAJOR(dev), MINOR(dev), ino);

	if (file) {
		seq_pad(m, ' ');
		seq_file_path(m, file, "");
	}

	seq_putc(m, '\n');
	return 0;
}

/*
 * display a list of all the REGIONs the kernel knows about
 * - nommu kernels have a single flat list
 */
static int nommu_region_list_show(struct seq_file *m, void *_p)
{
	struct rb_node *p = _p;

	return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
}

static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
{
	struct rb_node *p;
	loff_t pos = *_pos;

	down_read(&nommu_region_sem);

	for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
		if (pos-- == 0)
			return p;
	return NULL;
}

static void nommu_region_list_stop(struct seq_file *m, void *v)
{
	up_read(&nommu_region_sem);
}

static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
{
	(*pos)++;
	return rb_next((struct rb_node *) v);
}

static const struct seq_operations proc_nommu_region_list_seqop = {
	.start	= nommu_region_list_start,
	.next	= nommu_region_list_next,
	.stop	= nommu_region_list_stop,
	.show	= nommu_region_list_show
};

static int __init proc_nommu_init(void)
{
	proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop);
	return 0;
}

fs_initcall(proc_nommu_init);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/* nommu.c: mmu-less memory info files
	3	*
	4	* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
	5	* Written by David Howells (dhowells@redhat.com)
1da177e4 LT	6	*/
	7
	8	#include <linux/init.h>
	9	#include <linux/module.h>
	10	#include <linux/errno.h>
	11	#include <linux/time.h>
	12	#include <linux/kernel.h>
	13	#include <linux/string.h>
	14	#include <linux/mman.h>
	15	#include <linux/proc_fs.h>
	16	#include <linux/mm.h>
	17	#include <linux/mmzone.h>
	18	#include <linux/pagemap.h>
	19	#include <linux/swap.h>
1da177e4 LT	20	#include <linux/smp.h>
	21	#include <linux/seq_file.h>
	22	#include <linux/hugetlb.h>
	23	#include <linux/vmalloc.h>
7c0f6ba6	24	#include <linux/uaccess.h>
1da177e4 LT	25	#include <asm/pgtable.h>
	26	#include <asm/tlb.h>
	27	#include <asm/div64.h>
	28	#include "internal.h"
	29
	30	/*
8feae131	31	* display a single region to a sequenced file
1da177e4	32	*/
8feae131	33	static int nommu_region_show(struct seq_file m, struct vm_region region)
1da177e4	34	{
1da177e4 LT	35	unsigned long ino = 0;
	36	struct file *file;
	37	dev_t dev = 0;
652586df	38	int flags;
1da177e4	39
8feae131 DH	40	flags = region->vm_flags;
8feae131 DH	41	file = region->vm_file;
1da177e4 LT	42
1da177e4 LT	43	if (file) {
496ad9aa	44	struct inode *inode = file_inode(region->vm_file);
1da177e4 LT	45	dev = inode->i_sb->s_dev;
	46	ino = inode->i_ino;
	47	}
	48
652586df	49	seq_setwidth(m, 25 + sizeof(void ) 6 - 1);
1da177e4	50	seq_printf(m,
652586df	51	"%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
8feae131 DH	52	region->vm_start,
8feae131 DH	53	region->vm_end,
1da177e4 LT	54	flags & VM_READ ? 'r' : '-',
	55	flags & VM_WRITE ? 'w' : '-',
	56	flags & VM_EXEC ? 'x' : '-',
	57	flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
8feae131	58	((loff_t)region->vm_pgoff) << PAGE_SHIFT,
652586df	59	MAJOR(dev), MINOR(dev), ino);
1da177e4 LT	60
1da177e4 LT	61	if (file) {
652586df	62	seq_pad(m, ' ');
2726d566	63	seq_file_path(m, file, "");
1da177e4 LT	64	}
	65
	66	seq_putc(m, '\n');
	67	return 0;
	68	}
	69
dbf8685c	70	/*
8feae131	71	* display a list of all the REGIONs the kernel knows about
973c32be	72	* - nommu kernels have a single flat list
dbf8685c	73	*/
8feae131	74	static int nommu_region_list_show(struct seq_file m, void _p)
dbf8685c	75	{
8feae131	76	struct rb_node *p = _p;
dbf8685c	77
8feae131	78	return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
dbf8685c DH	79	}
dbf8685c DH	80
8feae131	81	static void nommu_region_list_start(struct seq_file m, loff_t *_pos)
1da177e4	82	{
8feae131	83	struct rb_node *p;
1da177e4	84	loff_t pos = *_pos;
1da177e4	85
8feae131	86	down_read(&nommu_region_sem);
1da177e4	87
8feae131 DH	88	for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
	89	if (pos-- == 0)
	90	return p;
	91	return NULL;
1da177e4 LT	92	}
1da177e4 LT	93
8feae131	94	static void nommu_region_list_stop(struct seq_file m, void v)
1da177e4	95	{
8feae131	96	up_read(&nommu_region_sem);
1da177e4 LT	97	}
1da177e4 LT	98
8feae131	99	static void nommu_region_list_next(struct seq_file m, void v, loff_t pos)
1da177e4 LT	100	{
	101	(*pos)++;
	102	return rb_next((struct rb_node *) v);
	103	}
	104
88e9d34c	105	static const struct seq_operations proc_nommu_region_list_seqop = {
8feae131 DH	106	.start = nommu_region_list_start,
	107	.next = nommu_region_list_next,
	108	.stop = nommu_region_list_stop,
	109	.show = nommu_region_list_show
1da177e4 LT	110	};
1da177e4 LT	111
1da177e4 LT	112	static int __init proc_nommu_init(void)
1da177e4 LT	113	{
fddda2b7	114	proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop);
1da177e4 LT	115	return 0;
	116	}
	117
abaf3787	118	fs_initcall(proc_nommu_init);