^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* nommu.c: mmu-less memory info files
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mmzone.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/hugetlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/div64.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * display a single region to a sequenced file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static int nommu_region_show(struct seq_file *m, struct vm_region *region)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) unsigned long ino = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct file *file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) dev_t dev = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) flags = region->vm_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) file = region->vm_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct inode *inode = file_inode(region->vm_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) dev = inode->i_sb->s_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) ino = inode->i_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) seq_printf(m,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) region->vm_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) region->vm_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) flags & VM_READ ? 'r' : '-',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) flags & VM_WRITE ? 'w' : '-',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) flags & VM_EXEC ? 'x' : '-',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ((loff_t)region->vm_pgoff) << PAGE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) MAJOR(dev), MINOR(dev), ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) seq_pad(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) seq_file_path(m, file, "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) seq_putc(m, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * display a list of all the REGIONs the kernel knows about
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * - nommu kernels have a single flat list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static int nommu_region_list_show(struct seq_file *m, void *_p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct rb_node *p = _p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct rb_node *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) loff_t pos = *_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) down_read(&nommu_region_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (pos-- == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static void nommu_region_list_stop(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) up_read(&nommu_region_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) (*pos)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return rb_next((struct rb_node *) v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static const struct seq_operations proc_nommu_region_list_seqop = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) .start = nommu_region_list_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) .next = nommu_region_list_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) .stop = nommu_region_list_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) .show = nommu_region_list_show
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static int __init proc_nommu_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) fs_initcall(proc_nommu_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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