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/*
* linux/fs/proc/proc_misc.c
*
* linux/fs/proc/array.c
* Copyright (C) 1992 by Linus Torvalds
* based on ideas by Darren Senn
*
* This used to be the part of array.c. See the rest of history and credits
* there. I took this into a separate file and switched the thing to generic
* proc_file_inode_operations, leaving in array.c only per-process stuff.
* Inumbers allocation made dynamic (via create_proc_entry()). AV, May 1999.
*
* Changes:
* Fulton Green : Encapsulated position metric calculations.
* <kernel@FultonGreen.com>
*/
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/fs.h>
#include <linux/tty.h>
#include <linux/string.h>
#include <linux/mman.h>
#include <linux/quicklist.h>
#include <linux/proc_fs.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/pagemap.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <linux/genhd.h>
#include <linux/smp.h>
#include <linux/signal.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/times.h>
#include <linux/profile.h>
#include <linux/utsname.h>
#include <linux/blkdev.h>
#include <linux/hugetlb.h>
#include <linux/jiffies.h>
#include <linux/vmalloc.h>
#include <linux/crash_dump.h>
#include <linux/pid_namespace.h>
#include <linux/bootmem.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/tlb.h>
#include <asm/div64.h>
#include "internal.h"
#ifdef CONFIG_PROC_PAGE_MONITOR
#define KPMSIZE sizeof(u64)
#define KPMMASK (KPMSIZE - 1)
/* /proc/kpagecount - an array exposing page counts
*
* Each entry is a u64 representing the corresponding
* physical page count.
*/
static ssize_t kpagecount_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
u64 __user *out = (u64 __user *)buf;
struct page *ppage;
unsigned long src = *ppos;
unsigned long pfn;
ssize_t ret = 0;
u64 pcount;
pfn = src / KPMSIZE;
count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
if (src & KPMMASK || count & KPMMASK)
return -EINVAL;
while (count > 0) {
ppage = NULL;
if (pfn_valid(pfn))
ppage = pfn_to_page(pfn);
pfn++;
if (!ppage)
pcount = 0;
else
pcount = page_mapcount(ppage);
if (put_user(pcount, out++)) {
ret = -EFAULT;
break;
}
count -= KPMSIZE;
}
*ppos += (char __user *)out - buf;
if (!ret)
ret = (char __user *)out - buf;
return ret;
}
static struct file_operations proc_kpagecount_operations = {
.llseek = mem_lseek,
.read = kpagecount_read,
};
/* /proc/kpageflags - an array exposing page flags
*
* Each entry is a u64 representing the corresponding
* physical page flags.
*/
/* These macros are used to decouple internal flags from exported ones */
#define KPF_LOCKED 0
#define KPF_ERROR 1
#define KPF_REFERENCED 2
#define KPF_UPTODATE 3
#define KPF_DIRTY 4
#define KPF_LRU 5
#define KPF_ACTIVE 6
#define KPF_SLAB 7
#define KPF_WRITEBACK 8
#define KPF_RECLAIM 9
#define KPF_BUDDY 10
#define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
static ssize_t kpageflags_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
u64 __user *out = (u64 __user *)buf;
struct page *ppage;
unsigned long src = *ppos;
unsigned long pfn;
ssize_t ret = 0;
u64 kflags, uflags;
pfn = src / KPMSIZE;
count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
if (src & KPMMASK || count & KPMMASK)
return -EINVAL;
while (count > 0) {
ppage = NULL;
if (pfn_valid(pfn))
ppage = pfn_to_page(pfn);
pfn++;
if (!ppage)
kflags = 0;
else
kflags = ppage->flags;
uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
if (put_user(uflags, out++)) {
ret = -EFAULT;
break;
}
count -= KPMSIZE;
}
*ppos += (char __user *)out - buf;
if (!ret)
ret = (char __user *)out - buf;
return ret;
}
static struct file_operations proc_kpageflags_operations = {
.llseek = mem_lseek,
.read = kpageflags_read,
};
#endif /* CONFIG_PROC_PAGE_MONITOR */
struct proc_dir_entry *proc_root_kcore;
void __init proc_misc_init(void)
{
proc_symlink("mounts", NULL, "self/mounts");
/* And now for trickier ones */
#ifdef CONFIG_PROC_KCORE
proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
if (proc_root_kcore)
proc_root_kcore->size =
(size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
#endif
#ifdef CONFIG_PROC_PAGE_MONITOR
proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
#endif
#ifdef CONFIG_PROC_VMCORE
proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
#endif
}
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