[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/drivers/char/mem.c b/ap/os/linux/linux-3.4.x/drivers/char/mem.c
new file mode 100644
index 0000000..0194896
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/char/mem.c
@@ -0,0 +1,962 @@
+/*
+ * linux/drivers/char/mem.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * Added devfs support.
+ * Jan-11-1998, C. Scott Ananian <cananian@alumni.princeton.edu>
+ * Shared /dev/zero mmapping support, Feb 2000, Kanoj Sarcar <kanoj@sgi.com>
+ */
+
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/mman.h>
+#include <linux/random.h>
+#include <linux/init.h>
+#include <linux/raw.h>
+#include <linux/tty.h>
+#include <linux/capability.h>
+#include <linux/ptrace.h>
+#include <linux/device.h>
+#include <linux/highmem.h>
+#include <linux/crash_dump.h>
+#include <linux/backing-dev.h>
+#include <linux/bootmem.h>
+#include <linux/splice.h>
+#include <linux/pfn.h>
+#include <linux/export.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#ifdef CONFIG_IA64
+# include <linux/efi.h>
+#endif
+
+static inline unsigned long size_inside_page(unsigned long start,
+ unsigned long size)
+{
+ unsigned long sz;
+
+ sz = PAGE_SIZE - (start & (PAGE_SIZE - 1));
+
+ return min(sz, size);
+}
+
+#ifndef ARCH_HAS_VALID_PHYS_ADDR_RANGE
+static inline int valid_phys_addr_range(unsigned long addr, size_t count)
+{
+ return addr + count <= __pa(high_memory);
+}
+
+static inline int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
+{
+ return 1;
+}
+#endif
+
+#if defined(CONFIG_DEVMEM) || defined(CONFIG_DEVKMEM)
+#ifdef CONFIG_STRICT_DEVMEM
+static inline int range_is_allowed(unsigned long pfn, unsigned long size)
+{
+ u64 from = ((u64)pfn) << PAGE_SHIFT;
+ u64 to = from + size;
+ u64 cursor = from;
+
+ while (cursor < to) {
+ if (!devmem_is_allowed(pfn)) {
+ printk(KERN_INFO
+ "Program %s tried to access /dev/mem between %Lx->%Lx.\n",
+ current->comm, from, to);
+ return 0;
+ }
+ cursor += PAGE_SIZE;
+ pfn++;
+ }
+ return 1;
+}
+#else
+static inline int range_is_allowed(unsigned long pfn, unsigned long size)
+{
+ return 1;
+}
+#endif
+#endif
+
+#ifdef CONFIG_DEVMEM
+void __weak unxlate_dev_mem_ptr(unsigned long phys, void *addr)
+{
+}
+
+/*
+ * This funcion reads the *physical* memory. The f_pos points directly to the
+ * memory location.
+ */
+static ssize_t read_mem(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ unsigned long p = *ppos;
+ ssize_t read, sz;
+ char *ptr;
+
+ if (!valid_phys_addr_range(p, count))
+ return -EFAULT;
+ read = 0;
+#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
+ /* we don't have page 0 mapped on sparc and m68k.. */
+ if (p < PAGE_SIZE) {
+ sz = size_inside_page(p, count);
+ if (sz > 0) {
+ if (clear_user(buf, sz))
+ return -EFAULT;
+ buf += sz;
+ p += sz;
+ count -= sz;
+ read += sz;
+ }
+ }
+#endif
+
+ while (count > 0) {
+ unsigned long remaining;
+
+ sz = size_inside_page(p, count);
+
+ if (!range_is_allowed(p >> PAGE_SHIFT, count))
+ return -EPERM;
+
+ /*
+ * On ia64 if a page has been mapped somewhere as uncached, then
+ * it must also be accessed uncached by the kernel or data
+ * corruption may occur.
+ */
+ ptr = xlate_dev_mem_ptr(p);
+ if (!ptr)
+ return -EFAULT;
+
+ remaining = copy_to_user(buf, ptr, sz);
+ unxlate_dev_mem_ptr(p, ptr);
+ if (remaining)
+ return -EFAULT;
+
+ buf += sz;
+ p += sz;
+ count -= sz;
+ read += sz;
+ }
+
+ *ppos += read;
+ return read;
+}
+
+static ssize_t write_mem(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ unsigned long p = *ppos;
+ ssize_t written, sz;
+ unsigned long copied;
+ void *ptr;
+
+ if (!valid_phys_addr_range(p, count))
+ return -EFAULT;
+
+ written = 0;
+
+#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
+ /* we don't have page 0 mapped on sparc and m68k.. */
+ if (p < PAGE_SIZE) {
+ sz = size_inside_page(p, count);
+ /* Hmm. Do something? */
+ buf += sz;
+ p += sz;
+ count -= sz;
+ written += sz;
+ }
+#endif
+
+ while (count > 0) {
+ sz = size_inside_page(p, count);
+
+ if (!range_is_allowed(p >> PAGE_SHIFT, sz))
+ return -EPERM;
+
+ /*
+ * On ia64 if a page has been mapped somewhere as uncached, then
+ * it must also be accessed uncached by the kernel or data
+ * corruption may occur.
+ */
+ ptr = xlate_dev_mem_ptr(p);
+ if (!ptr) {
+ if (written)
+ break;
+ return -EFAULT;
+ }
+
+ copied = copy_from_user(ptr, buf, sz);
+ unxlate_dev_mem_ptr(p, ptr);
+ if (copied) {
+ written += sz - copied;
+ if (written)
+ break;
+ return -EFAULT;
+ }
+
+ buf += sz;
+ p += sz;
+ count -= sz;
+ written += sz;
+ }
+
+ *ppos += written;
+ return written;
+}
+#endif /* CONFIG_DEVMEM */
+
+#if defined(CONFIG_DEVMEM) || defined(CONFIG_DEVKMEM)
+
+int __weak phys_mem_access_prot_allowed(struct file *file,
+ unsigned long pfn, unsigned long size, pgprot_t *vma_prot)
+{
+ return 1;
+}
+
+#ifndef __HAVE_PHYS_MEM_ACCESS_PROT
+
+/*
+ * Architectures vary in how they handle caching for addresses
+ * outside of main memory.
+ *
+ */
+#ifdef pgprot_noncached
+static int uncached_access(struct file *file, unsigned long addr)
+{
+#if defined(CONFIG_IA64)
+ /*
+ * On ia64, we ignore O_DSYNC because we cannot tolerate memory
+ * attribute aliases.
+ */
+ return !(efi_mem_attributes(addr) & EFI_MEMORY_WB);
+#elif defined(CONFIG_MIPS)
+ {
+ extern int __uncached_access(struct file *file,
+ unsigned long addr);
+
+ return __uncached_access(file, addr);
+ }
+#else
+ /*
+ * Accessing memory above the top the kernel knows about or through a
+ * file pointer
+ * that was marked O_DSYNC will be done non-cached.
+ */
+ if (file->f_flags & O_DSYNC)
+ return 1;
+ return addr >= __pa(high_memory);
+#endif
+}
+#endif
+
+static pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+ unsigned long size, pgprot_t vma_prot)
+{
+#ifdef pgprot_noncached
+ unsigned long offset = pfn << PAGE_SHIFT;
+
+ if (uncached_access(file, offset))
+ return pgprot_noncached(vma_prot);
+#endif
+ return vma_prot;
+}
+#endif
+
+#ifndef CONFIG_MMU
+static unsigned long get_unmapped_area_mem(struct file *file,
+ unsigned long addr,
+ unsigned long len,
+ unsigned long pgoff,
+ unsigned long flags)
+{
+ if (!valid_mmap_phys_addr_range(pgoff, len))
+ return (unsigned long) -EINVAL;
+ return pgoff << PAGE_SHIFT;
+}
+
+/* can't do an in-place private mapping if there's no MMU */
+static inline int private_mapping_ok(struct vm_area_struct *vma)
+{
+ return vma->vm_flags & VM_MAYSHARE;
+}
+#else
+#define get_unmapped_area_mem NULL
+
+static inline int private_mapping_ok(struct vm_area_struct *vma)
+{
+ return 1;
+}
+#endif
+
+static const struct vm_operations_struct mmap_mem_ops = {
+#ifdef CONFIG_HAVE_IOREMAP_PROT
+ .access = generic_access_phys
+#endif
+};
+
+static int mmap_mem(struct file *file, struct vm_area_struct *vma)
+{
+ size_t size = vma->vm_end - vma->vm_start;
+
+ if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
+ return -EINVAL;
+
+ if (!private_mapping_ok(vma))
+ return -ENOSYS;
+
+ if (!range_is_allowed(vma->vm_pgoff, size))
+ return -EPERM;
+
+ if (!phys_mem_access_prot_allowed(file, vma->vm_pgoff, size,
+ &vma->vm_page_prot))
+ return -EINVAL;
+
+ vma->vm_page_prot = phys_mem_access_prot(file, vma->vm_pgoff,
+ size,
+ vma->vm_page_prot);
+
+ vma->vm_ops = &mmap_mem_ops;
+
+ /* Remap-pfn-range will mark the range VM_IO and VM_RESERVED */
+ if (remap_pfn_range(vma,
+ vma->vm_start,
+ vma->vm_pgoff,
+ size,
+ vma->vm_page_prot)) {
+ return -EAGAIN;
+ }
+ return 0;
+}
+#endif /* CONFIG_DEVMEM */
+
+#ifdef CONFIG_DEVKMEM
+static int mmap_kmem(struct file *file, struct vm_area_struct *vma)
+{
+ unsigned long pfn;
+
+ /* Turn a kernel-virtual address into a physical page frame */
+ pfn = __pa((u64)vma->vm_pgoff << PAGE_SHIFT) >> PAGE_SHIFT;
+
+ /*
+ * RED-PEN: on some architectures there is more mapped memory than
+ * available in mem_map which pfn_valid checks for. Perhaps should add a
+ * new macro here.
+ *
+ * RED-PEN: vmalloc is not supported right now.
+ */
+ if (!pfn_valid(pfn))
+ return -EIO;
+
+ vma->vm_pgoff = pfn;
+ return mmap_mem(file, vma);
+}
+#endif
+
+#ifdef CONFIG_CRASH_DUMP
+/*
+ * Read memory corresponding to the old kernel.
+ */
+static ssize_t read_oldmem(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ unsigned long pfn, offset;
+ size_t read = 0, csize;
+ int rc = 0;
+
+ while (count) {
+ pfn = *ppos / PAGE_SIZE;
+ if (pfn > saved_max_pfn)
+ return read;
+
+ offset = (unsigned long)(*ppos % PAGE_SIZE);
+ if (count > PAGE_SIZE - offset)
+ csize = PAGE_SIZE - offset;
+ else
+ csize = count;
+
+ rc = copy_oldmem_page(pfn, buf, csize, offset, 1);
+ if (rc < 0)
+ return rc;
+ buf += csize;
+ *ppos += csize;
+ read += csize;
+ count -= csize;
+ }
+ return read;
+}
+#endif
+
+#ifdef CONFIG_DEVKMEM
+/*
+ * This function reads the *virtual* memory as seen by the kernel.
+ */
+static ssize_t read_kmem(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ unsigned long p = *ppos;
+ ssize_t low_count, read, sz;
+ char * kbuf; /* k-addr because vread() takes vmlist_lock rwlock */
+ int err = 0;
+
+ read = 0;
+ if (p < (unsigned long) high_memory) {
+ low_count = count;
+ if (count > (unsigned long)high_memory - p)
+ low_count = (unsigned long)high_memory - p;
+
+#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
+ /* we don't have page 0 mapped on sparc and m68k.. */
+ if (p < PAGE_SIZE && low_count > 0) {
+ sz = size_inside_page(p, low_count);
+ if (clear_user(buf, sz))
+ return -EFAULT;
+ buf += sz;
+ p += sz;
+ read += sz;
+ low_count -= sz;
+ count -= sz;
+ }
+#endif
+ while (low_count > 0) {
+ sz = size_inside_page(p, low_count);
+
+ /*
+ * On ia64 if a page has been mapped somewhere as
+ * uncached, then it must also be accessed uncached
+ * by the kernel or data corruption may occur
+ */
+ kbuf = xlate_dev_kmem_ptr((char *)p);
+
+ if (copy_to_user(buf, kbuf, sz))
+ return -EFAULT;
+ buf += sz;
+ p += sz;
+ read += sz;
+ low_count -= sz;
+ count -= sz;
+ }
+ }
+
+ if (count > 0) {
+ kbuf = (char *)__get_free_page(GFP_KERNEL);
+ if (!kbuf)
+ return -ENOMEM;
+ while (count > 0) {
+ sz = size_inside_page(p, count);
+ if (!is_vmalloc_or_module_addr((void *)p)) {
+ err = -ENXIO;
+ break;
+ }
+ sz = vread(kbuf, (char *)p, sz);
+ if (!sz)
+ break;
+ if (copy_to_user(buf, kbuf, sz)) {
+ err = -EFAULT;
+ break;
+ }
+ count -= sz;
+ buf += sz;
+ read += sz;
+ p += sz;
+ }
+ free_page((unsigned long)kbuf);
+ }
+ *ppos = p;
+ return read ? read : err;
+}
+
+
+static ssize_t do_write_kmem(unsigned long p, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t written, sz;
+ unsigned long copied;
+
+ written = 0;
+#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
+ /* we don't have page 0 mapped on sparc and m68k.. */
+ if (p < PAGE_SIZE) {
+ sz = size_inside_page(p, count);
+ /* Hmm. Do something? */
+ buf += sz;
+ p += sz;
+ count -= sz;
+ written += sz;
+ }
+#endif
+
+ while (count > 0) {
+ char *ptr;
+
+ sz = size_inside_page(p, count);
+
+ /*
+ * On ia64 if a page has been mapped somewhere as uncached, then
+ * it must also be accessed uncached by the kernel or data
+ * corruption may occur.
+ */
+ ptr = xlate_dev_kmem_ptr((char *)p);
+
+ copied = copy_from_user(ptr, buf, sz);
+ if (copied) {
+ written += sz - copied;
+ if (written)
+ break;
+ return -EFAULT;
+ }
+ buf += sz;
+ p += sz;
+ count -= sz;
+ written += sz;
+ }
+
+ *ppos += written;
+ return written;
+}
+
+/*
+ * This function writes to the *virtual* memory as seen by the kernel.
+ */
+static ssize_t write_kmem(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ unsigned long p = *ppos;
+ ssize_t wrote = 0;
+ ssize_t virtr = 0;
+ char * kbuf; /* k-addr because vwrite() takes vmlist_lock rwlock */
+ int err = 0;
+
+ if (p < (unsigned long) high_memory) {
+ unsigned long to_write = min_t(unsigned long, count,
+ (unsigned long)high_memory - p);
+ wrote = do_write_kmem(p, buf, to_write, ppos);
+ if (wrote != to_write)
+ return wrote;
+ p += wrote;
+ buf += wrote;
+ count -= wrote;
+ }
+
+ if (count > 0) {
+ kbuf = (char *)__get_free_page(GFP_KERNEL);
+ if (!kbuf)
+ return wrote ? wrote : -ENOMEM;
+ while (count > 0) {
+ unsigned long sz = size_inside_page(p, count);
+ unsigned long n;
+
+ if (!is_vmalloc_or_module_addr((void *)p)) {
+ err = -ENXIO;
+ break;
+ }
+ n = copy_from_user(kbuf, buf, sz);
+ if (n) {
+ err = -EFAULT;
+ break;
+ }
+ vwrite(kbuf, (char *)p, sz);
+ count -= sz;
+ buf += sz;
+ virtr += sz;
+ p += sz;
+ }
+ free_page((unsigned long)kbuf);
+ }
+
+ *ppos = p;
+ return virtr + wrote ? : err;
+}
+#endif
+
+#ifdef CONFIG_DEVPORT
+static ssize_t read_port(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ unsigned long i = *ppos;
+ char __user *tmp = buf;
+
+ if (!access_ok(VERIFY_WRITE, buf, count))
+ return -EFAULT;
+ while (count-- > 0 && i < 65536) {
+ if (__put_user(inb(i), tmp) < 0)
+ return -EFAULT;
+ i++;
+ tmp++;
+ }
+ *ppos = i;
+ return tmp-buf;
+}
+
+static ssize_t write_port(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ unsigned long i = *ppos;
+ const char __user * tmp = buf;
+
+ if (!access_ok(VERIFY_READ, buf, count))
+ return -EFAULT;
+ while (count-- > 0 && i < 65536) {
+ char c;
+ if (__get_user(c, tmp)) {
+ if (tmp > buf)
+ break;
+ return -EFAULT;
+ }
+ outb(c, i);
+ i++;
+ tmp++;
+ }
+ *ppos = i;
+ return tmp-buf;
+}
+#endif
+
+static ssize_t read_null(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ return 0;
+}
+
+static ssize_t write_null(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ return count;
+}
+
+static int pipe_to_null(struct pipe_inode_info *info, struct pipe_buffer *buf,
+ struct splice_desc *sd)
+{
+ return sd->len;
+}
+
+static ssize_t splice_write_null(struct pipe_inode_info *pipe, struct file *out,
+ loff_t *ppos, size_t len, unsigned int flags)
+{
+ return splice_from_pipe(pipe, out, ppos, len, flags, pipe_to_null);
+}
+
+static ssize_t read_zero(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ size_t written;
+
+ if (!count)
+ return 0;
+
+ if (!access_ok(VERIFY_WRITE, buf, count))
+ return -EFAULT;
+
+ written = 0;
+ while (count) {
+ unsigned long unwritten;
+ size_t chunk = count;
+
+ if (chunk > PAGE_SIZE)
+ chunk = PAGE_SIZE; /* Just for latency reasons */
+ unwritten = __clear_user(buf, chunk);
+ written += chunk - unwritten;
+ if (unwritten)
+ break;
+ if (signal_pending(current))
+ return written ? written : -ERESTARTSYS;
+ buf += chunk;
+ count -= chunk;
+ cond_resched();
+ }
+ return written ? written : -EFAULT;
+}
+
+static int mmap_zero(struct file *file, struct vm_area_struct *vma)
+{
+#ifndef CONFIG_MMU
+ return -ENOSYS;
+#endif
+ if (vma->vm_flags & VM_SHARED)
+ return shmem_zero_setup(vma);
+ return 0;
+}
+
+static ssize_t write_full(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ return -ENOSPC;
+}
+
+/*
+ * Special lseek() function for /dev/null and /dev/zero. Most notably, you
+ * can fopen() both devices with "a" now. This was previously impossible.
+ * -- SRB.
+ */
+static loff_t null_lseek(struct file *file, loff_t offset, int orig)
+{
+ return file->f_pos = 0;
+}
+
+#if defined(CONFIG_DEVMEM) || defined(CONFIG_DEVKMEM) || defined(CONFIG_DEVPORT)
+
+/*
+ * The memory devices use the full 32/64 bits of the offset, and so we cannot
+ * check against negative addresses: they are ok. The return value is weird,
+ * though, in that case (0).
+ *
+ * also note that seeking relative to the "end of file" isn't supported:
+ * it has no meaning, so it returns -EINVAL.
+ */
+static loff_t memory_lseek(struct file *file, loff_t offset, int orig)
+{
+ loff_t ret;
+
+ mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
+ switch (orig) {
+ case SEEK_CUR:
+ offset += file->f_pos;
+ case SEEK_SET:
+ /* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */
+ if ((unsigned long long)offset >= ~0xFFFULL) {
+ ret = -EOVERFLOW;
+ break;
+ }
+ file->f_pos = offset;
+ ret = file->f_pos;
+ force_successful_syscall_return();
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
+ return ret;
+}
+
+#endif
+
+#if defined(CONFIG_DEVMEM) || defined(CONFIG_DEVKMEM) || defined(CONFIG_DEVPORT)
+static int open_port(struct inode * inode, struct file * filp)
+{
+ return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
+}
+#endif
+
+#define zero_lseek null_lseek
+#define full_lseek null_lseek
+#define write_zero write_null
+#define read_full read_zero
+#define open_mem open_port
+#define open_kmem open_mem
+#define open_oldmem open_mem
+
+#ifdef CONFIG_DEVMEM
+static const struct file_operations mem_fops = {
+ .llseek = memory_lseek,
+ .read = read_mem,
+ .write = write_mem,
+ .mmap = mmap_mem,
+ .open = open_mem,
+ .get_unmapped_area = get_unmapped_area_mem,
+};
+#endif
+
+#ifdef CONFIG_DEVKMEM
+static const struct file_operations kmem_fops = {
+ .llseek = memory_lseek,
+ .read = read_kmem,
+ .write = write_kmem,
+ .mmap = mmap_kmem,
+ .open = open_kmem,
+ .get_unmapped_area = get_unmapped_area_mem,
+};
+#endif
+
+static const struct file_operations null_fops = {
+ .llseek = null_lseek,
+ .read = read_null,
+ .write = write_null,
+ .splice_write = splice_write_null,
+};
+
+#ifdef CONFIG_DEVPORT
+static const struct file_operations port_fops = {
+ .llseek = memory_lseek,
+ .read = read_port,
+ .write = write_port,
+ .open = open_port,
+};
+#endif
+
+static const struct file_operations zero_fops = {
+ .llseek = zero_lseek,
+ .read = read_zero,
+ .write = write_zero,
+ .mmap = mmap_zero,
+};
+
+/*
+ * capabilities for /dev/zero
+ * - permits private mappings, "copies" are taken of the source of zeros
+ * - no writeback happens
+ */
+static struct backing_dev_info zero_bdi = {
+ .name = "char/mem",
+ .capabilities = BDI_CAP_MAP_COPY | BDI_CAP_NO_ACCT_AND_WRITEBACK,
+};
+
+static const struct file_operations full_fops = {
+ .llseek = full_lseek,
+ .read = read_full,
+ .write = write_full,
+};
+
+#ifdef CONFIG_CRASH_DUMP
+static const struct file_operations oldmem_fops = {
+ .read = read_oldmem,
+ .open = open_oldmem,
+ .llseek = default_llseek,
+};
+#endif
+
+static ssize_t kmsg_writev(struct kiocb *iocb, const struct iovec *iv,
+ unsigned long count, loff_t pos)
+{
+ char *line, *p;
+ int i;
+ ssize_t ret = -EFAULT;
+ size_t len = iov_length(iv, count);
+
+ line = kmalloc(len + 1, GFP_KERNEL);
+ if (line == NULL)
+ return -ENOMEM;
+
+ /*
+ * copy all vectors into a single string, to ensure we do
+ * not interleave our log line with other printk calls
+ */
+ p = line;
+ for (i = 0; i < count; i++) {
+ if (copy_from_user(p, iv[i].iov_base, iv[i].iov_len))
+ goto out;
+ p += iv[i].iov_len;
+ }
+ p[0] = '\0';
+
+ ret = printk("%s", line);
+ /* printk can add a prefix */
+ if (ret > len)
+ ret = len;
+out:
+ kfree(line);
+ return ret;
+}
+
+static const struct file_operations kmsg_fops = {
+ .aio_write = kmsg_writev,
+ .llseek = noop_llseek,
+};
+
+static const struct memdev {
+ const char *name;
+ umode_t mode;
+ const struct file_operations *fops;
+ struct backing_dev_info *dev_info;
+} devlist[] = {
+#ifdef CONFIG_DEVMEM
+ [1] = { "mem", 0, &mem_fops, &directly_mappable_cdev_bdi },
+#endif
+#ifdef CONFIG_DEVKMEM
+ [2] = { "kmem", 0, &kmem_fops, &directly_mappable_cdev_bdi },
+#endif
+ [3] = { "null", 0666, &null_fops, NULL },
+#ifdef CONFIG_DEVPORT
+ [4] = { "port", 0, &port_fops, NULL },
+#endif
+ [5] = { "zero", 0666, &zero_fops, &zero_bdi },
+ [7] = { "full", 0666, &full_fops, NULL },
+ [8] = { "random", 0666, &random_fops, NULL },
+ [9] = { "urandom", 0666, &urandom_fops, NULL },
+ [11] = { "kmsg", 0, &kmsg_fops, NULL },
+#ifdef CONFIG_CRASH_DUMP
+ [12] = { "oldmem", 0, &oldmem_fops, NULL },
+#endif
+};
+
+static int memory_open(struct inode *inode, struct file *filp)
+{
+ int minor;
+ const struct memdev *dev;
+
+ minor = iminor(inode);
+ if (minor >= ARRAY_SIZE(devlist))
+ return -ENXIO;
+
+ dev = &devlist[minor];
+ if (!dev->fops)
+ return -ENXIO;
+
+ filp->f_op = dev->fops;
+ if (dev->dev_info)
+ filp->f_mapping->backing_dev_info = dev->dev_info;
+
+ /* Is /dev/mem or /dev/kmem ? */
+ if (dev->dev_info == &directly_mappable_cdev_bdi)
+ filp->f_mode |= FMODE_UNSIGNED_OFFSET;
+
+ if (dev->fops->open)
+ return dev->fops->open(inode, filp);
+
+ return 0;
+}
+
+static const struct file_operations memory_fops = {
+ .open = memory_open,
+ .llseek = noop_llseek,
+};
+
+static char *mem_devnode(struct device *dev, umode_t *mode)
+{
+ #ifdef CONFIG_KLOCWORK
+ if(MINOR(dev->devt) >=ARRAY_SIZE(devlist))
+ return NULL;
+ #endif
+
+ if (mode && devlist[MINOR(dev->devt)].mode)
+ *mode = devlist[MINOR(dev->devt)].mode;
+ return NULL;
+}
+
+static struct class *mem_class;
+
+static int __init chr_dev_init(void)
+{
+ int minor;
+ int err;
+
+ err = bdi_init(&zero_bdi);
+ if (err)
+ return err;
+
+ if (register_chrdev(MEM_MAJOR, "mem", &memory_fops))
+ printk("unable to get major %d for memory devs\n", MEM_MAJOR);
+
+ mem_class = class_create(THIS_MODULE, "mem");
+ if (IS_ERR(mem_class))
+ return PTR_ERR(mem_class);
+
+ mem_class->devnode = mem_devnode;
+ for (minor = 1; minor < ARRAY_SIZE(devlist); minor++) {
+ if (!devlist[minor].name)
+ continue;
+ device_create(mem_class, NULL, MKDEV(MEM_MAJOR, minor),
+ NULL, devlist[minor].name);
+ }
+
+ return tty_init();
+}
+
+fs_initcall(chr_dev_init);