diff options
Diffstat (limited to 'linux-2.6-xen-sparse/drivers/char/mem.c')
| -rw-r--r-- | linux-2.6-xen-sparse/drivers/char/mem.c | 956 |
1 files changed, 0 insertions, 956 deletions
diff --git a/linux-2.6-xen-sparse/drivers/char/mem.c b/linux-2.6-xen-sparse/drivers/char/mem.c deleted file mode 100644 index 4bfcfb84ac..0000000000 --- a/linux-2.6-xen-sparse/drivers/char/mem.c +++ /dev/null @@ -1,956 +0,0 @@ -/* - * 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 mmaping 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/smp_lock.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/pipe_fs_i.h> - -#include <asm/uaccess.h> -#include <asm/io.h> - -#ifdef CONFIG_IA64 -# include <linux/efi.h> -#endif - -/* - * Architectures vary in how they handle caching for addresses - * outside of main memory. - * - */ -static inline int uncached_access(struct file *file, unsigned long addr) -{ -#if defined(__i386__) - /* - * On the PPro and successors, the MTRRs are used to set - * memory types for physical addresses outside main memory, - * so blindly setting PCD or PWT on those pages is wrong. - * For Pentiums and earlier, the surround logic should disable - * caching for the high addresses through the KEN pin, but - * we maintain the tradition of paranoia in this code. - */ - if (file->f_flags & O_SYNC) - return 1; - return !( test_bit(X86_FEATURE_MTRR, boot_cpu_data.x86_capability) || - test_bit(X86_FEATURE_K6_MTRR, boot_cpu_data.x86_capability) || - test_bit(X86_FEATURE_CYRIX_ARR, boot_cpu_data.x86_capability) || - test_bit(X86_FEATURE_CENTAUR_MCR, boot_cpu_data.x86_capability) ) - && addr >= __pa(high_memory); -#elif defined(__x86_64__) - /* - * This is broken because it can generate memory type aliases, - * which can cause cache corruptions - * But it is only available for root and we have to be bug-to-bug - * compatible with i386. - */ - if (file->f_flags & O_SYNC) - return 1; - /* same behaviour as i386. PAT always set to cached and MTRRs control the - caching behaviour. - Hopefully a full PAT implementation will fix that soon. */ - return 0; -#elif defined(CONFIG_IA64) - /* - * On ia64, we ignore O_SYNC because we cannot tolerate memory attribute aliases. - */ - return !(efi_mem_attributes(addr) & EFI_MEMORY_WB); -#else - /* - * Accessing memory above the top the kernel knows about or through a file pointer - * that was marked O_SYNC will be done non-cached. - */ - if (file->f_flags & O_SYNC) - return 1; - return addr >= __pa(high_memory); -#endif -} - -#ifndef ARCH_HAS_VALID_PHYS_ADDR_RANGE -static inline int valid_phys_addr_range(unsigned long addr, size_t count) -{ - if (addr + count > __pa(high_memory)) - return 0; - - return 1; -} - -static inline int valid_mmap_phys_addr_range(unsigned long pfn, size_t size) -{ - return 1; -} -#endif - -#ifndef ARCH_HAS_DEV_MEM -/* - * 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 = PAGE_SIZE - p; - if (sz > count) - sz = count; - if (sz > 0) { - if (clear_user(buf, sz)) - return -EFAULT; - buf += sz; - p += sz; - count -= sz; - read += sz; - } - } -#endif - - while (count > 0) { - /* - * Handle first page in case it's not aligned - */ - if (-p & (PAGE_SIZE - 1)) - sz = -p & (PAGE_SIZE - 1); - else - sz = PAGE_SIZE; - - sz = min_t(unsigned long, sz, 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_mem_ptr(p); - - if (copy_to_user(buf, ptr, sz)) - 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) { - unsigned long sz = PAGE_SIZE - p; - if (sz > count) - sz = count; - /* Hmm. Do something? */ - buf += sz; - p += sz; - count -= sz; - written += sz; - } -#endif - - while (count > 0) { - /* - * Handle first page in case it's not aligned - */ - if (-p & (PAGE_SIZE - 1)) - sz = -p & (PAGE_SIZE - 1); - else - sz = PAGE_SIZE; - - sz = min_t(unsigned long, sz, 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_mem_ptr(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; -} -#endif - -#ifndef __HAVE_PHYS_MEM_ACCESS_PROT -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 - -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; - - vma->vm_page_prot = phys_mem_access_prot(file, vma->vm_pgoff, - size, - vma->vm_page_prot); - - /* 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; -} - -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); -} - -#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 - -extern long vread(char *buf, char *addr, unsigned long count); -extern long vwrite(char *buf, char *addr, unsigned long count); - -/* - * 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 */ - - 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) { - size_t tmp = PAGE_SIZE - p; - if (tmp > low_count) tmp = low_count; - if (clear_user(buf, tmp)) - return -EFAULT; - buf += tmp; - p += tmp; - read += tmp; - low_count -= tmp; - count -= tmp; - } -#endif - while (low_count > 0) { - /* - * Handle first page in case it's not aligned - */ - if (-p & (PAGE_SIZE - 1)) - sz = -p & (PAGE_SIZE - 1); - else - sz = PAGE_SIZE; - - sz = min_t(unsigned long, sz, 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) { - int len = count; - - if (len > PAGE_SIZE) - len = PAGE_SIZE; - len = vread(kbuf, (char *)p, len); - if (!len) - break; - if (copy_to_user(buf, kbuf, len)) { - free_page((unsigned long)kbuf); - return -EFAULT; - } - count -= len; - buf += len; - read += len; - p += len; - } - free_page((unsigned long)kbuf); - } - *ppos = p; - return read; -} - - -static inline ssize_t -do_write_kmem(void *p, unsigned long realp, 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 (realp < PAGE_SIZE) { - unsigned long sz = PAGE_SIZE - realp; - if (sz > count) - sz = count; - /* Hmm. Do something? */ - buf += sz; - p += sz; - realp += sz; - count -= sz; - written += sz; - } -#endif - - while (count > 0) { - char *ptr; - /* - * Handle first page in case it's not aligned - */ - if (-realp & (PAGE_SIZE - 1)) - sz = -realp & (PAGE_SIZE - 1); - else - sz = PAGE_SIZE; - - sz = min_t(unsigned long, sz, 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(p); - - copied = copy_from_user(ptr, buf, sz); - if (copied) { - written += sz - copied; - if (written) - break; - return -EFAULT; - } - buf += sz; - p += sz; - realp += 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; - ssize_t written; - char * kbuf; /* k-addr because vwrite() takes vmlist_lock rwlock */ - - if (p < (unsigned long) high_memory) { - - wrote = count; - if (count > (unsigned long) high_memory - p) - wrote = (unsigned long) high_memory - p; - - written = do_write_kmem((void*)p, p, buf, wrote, ppos); - if (written != wrote) - return written; - wrote = written; - 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) { - int len = count; - - if (len > PAGE_SIZE) - len = PAGE_SIZE; - if (len) { - written = copy_from_user(kbuf, buf, len); - if (written) { - if (wrote + virtr) - break; - free_page((unsigned long)kbuf); - return -EFAULT; - } - } - len = vwrite(kbuf, (char *)p, len); - count -= len; - buf += len; - virtr += len; - p += len; - } - free_page((unsigned long)kbuf); - } - - *ppos = p; - return virtr + wrote; -} - -#if defined(CONFIG_ISA) || !defined(__mc68000__) -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); -} - -#ifdef CONFIG_MMU -/* - * For fun, we are using the MMU for this. - */ -static inline size_t read_zero_pagealigned(char __user * buf, size_t size) -{ - struct mm_struct *mm; - struct vm_area_struct * vma; - unsigned long addr=(unsigned long)buf; - - mm = current->mm; - /* Oops, this was forgotten before. -ben */ - down_read(&mm->mmap_sem); - - /* For private mappings, just map in zero pages. */ - for (vma = find_vma(mm, addr); vma; vma = vma->vm_next) { - unsigned long count; - - if (vma->vm_start > addr || (vma->vm_flags & VM_WRITE) == 0) - goto out_up; - if (vma->vm_flags & (VM_SHARED | VM_HUGETLB)) - break; - count = vma->vm_end - addr; - if (count > size) - count = size; - - zap_page_range(vma, addr, count, NULL); - zeromap_page_range(vma, addr, count, PAGE_COPY); - - size -= count; - buf += count; - addr += count; - if (size == 0) - goto out_up; - } - - up_read(&mm->mmap_sem); - - /* The shared case is hard. Let's do the conventional zeroing. */ - do { - unsigned long unwritten = clear_user(buf, PAGE_SIZE); - if (unwritten) - return size + unwritten - PAGE_SIZE; - cond_resched(); - buf += PAGE_SIZE; - size -= PAGE_SIZE; - } while (size); - - return size; -out_up: - up_read(&mm->mmap_sem); - return size; -} - -static ssize_t read_zero(struct file * file, char __user * buf, - size_t count, loff_t *ppos) -{ - unsigned long left, unwritten, written = 0; - - if (!count) - return 0; - - if (!access_ok(VERIFY_WRITE, buf, count)) - return -EFAULT; - - left = count; - - /* do we want to be clever? Arbitrary cut-off */ - if (count >= PAGE_SIZE*4) { - unsigned long partial; - - /* How much left of the page? */ - partial = (PAGE_SIZE-1) & -(unsigned long) buf; - unwritten = clear_user(buf, partial); - written = partial - unwritten; - if (unwritten) - goto out; - left -= partial; - buf += partial; - unwritten = read_zero_pagealigned(buf, left & PAGE_MASK); - written += (left & PAGE_MASK) - unwritten; - if (unwritten) - goto out; - buf += left & PAGE_MASK; - left &= ~PAGE_MASK; - } - unwritten = clear_user(buf, left); - written += left - unwritten; -out: - return written ? written : -EFAULT; -} - -static int mmap_zero(struct file * file, struct vm_area_struct * vma) -{ - if (vma->vm_flags & VM_SHARED) - return shmem_zero_setup(vma); - if (zeromap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start, vma->vm_page_prot)) - return -EAGAIN; - return 0; -} -#else /* CONFIG_MMU */ -static ssize_t read_zero(struct file * file, char * buf, - size_t count, loff_t *ppos) -{ - size_t todo = count; - - while (todo) { - size_t chunk = todo; - - if (chunk > 4096) - chunk = 4096; /* Just for latency reasons */ - if (clear_user(buf, chunk)) - return -EFAULT; - buf += chunk; - todo -= chunk; - cond_resched(); - } - return count; -} - -static int mmap_zero(struct file * file, struct vm_area_struct * vma) -{ - return -ENOSYS; -} -#endif /* CONFIG_MMU */ - -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; -} - -/* - * 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_dentry->d_inode->i_mutex); - switch (orig) { - case 0: - file->f_pos = offset; - ret = file->f_pos; - force_successful_syscall_return(); - break; - case 1: - file->f_pos += offset; - ret = file->f_pos; - force_successful_syscall_return(); - break; - default: - ret = -EINVAL; - } - mutex_unlock(&file->f_dentry->d_inode->i_mutex); - return ret; -} - -static int open_port(struct inode * inode, struct file * filp) -{ - return capable(CAP_SYS_RAWIO) ? 0 : -EPERM; -} - -#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 - -#ifndef ARCH_HAS_DEV_MEM -static const struct file_operations mem_fops = { - .llseek = memory_lseek, - .read = read_mem, - .write = write_mem, - .mmap = mmap_mem, - .open = open_mem, -}; -#else -extern const struct file_operations mem_fops; -#endif - -static const struct file_operations kmem_fops = { - .llseek = memory_lseek, - .read = read_kmem, - .write = write_kmem, - .mmap = mmap_kmem, - .open = open_kmem, -}; - -static const struct file_operations null_fops = { - .llseek = null_lseek, - .read = read_null, - .write = write_null, - .splice_write = splice_write_null, -}; - -#if defined(CONFIG_ISA) || !defined(__mc68000__) -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, -}; - -static struct backing_dev_info zero_bdi = { - .capabilities = BDI_CAP_MAP_COPY, -}; - -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, -}; -#endif - -static ssize_t kmsg_write(struct file * file, const char __user * buf, - size_t count, loff_t *ppos) -{ - char *tmp; - ssize_t ret; - - tmp = kmalloc(count + 1, GFP_KERNEL); - if (tmp == NULL) - return -ENOMEM; - ret = -EFAULT; - if (!copy_from_user(tmp, buf, count)) { - tmp[count] = 0; - ret = printk("%s", tmp); - if (ret > count) - /* printk can add a prefix */ - ret = count; - } - kfree(tmp); - return ret; -} - -static const struct file_operations kmsg_fops = { - .write = kmsg_write, -}; - -static int memory_open(struct inode * inode, struct file * filp) -{ - switch (iminor(inode)) { - case 1: - filp->f_op = &mem_fops; - break; - case 2: - filp->f_op = &kmem_fops; - break; - case 3: - filp->f_op = &null_fops; - break; -#if defined(CONFIG_ISA) || !defined(__mc68000__) - case 4: - filp->f_op = &port_fops; - break; -#endif - case 5: - filp->f_mapping->backing_dev_info = &zero_bdi; - filp->f_op = &zero_fops; - break; - case 7: - filp->f_op = &full_fops; - break; - case 8: - filp->f_op = &random_fops; - break; - case 9: - filp->f_op = &urandom_fops; - break; - case 11: - filp->f_op = &kmsg_fops; - break; -#ifdef CONFIG_CRASH_DUMP - case 12: - filp->f_op = &oldmem_fops; - break; -#endif - default: - return -ENXIO; - } - if (filp->f_op && filp->f_op->open) - return filp->f_op->open(inode,filp); - return 0; -} - -static const struct file_operations memory_fops = { - .open = memory_open, /* just a selector for the real open */ -}; - -static const struct { - unsigned int minor; - char *name; - umode_t mode; - const struct file_operations *fops; -} devlist[] = { /* list of minor devices */ - {1, "mem", S_IRUSR | S_IWUSR | S_IRGRP, &mem_fops}, - {2, "kmem", S_IRUSR | S_IWUSR | S_IRGRP, &kmem_fops}, - {3, "null", S_IRUGO | S_IWUGO, &null_fops}, -#if defined(CONFIG_ISA) || !defined(__mc68000__) - {4, "port", S_IRUSR | S_IWUSR | S_IRGRP, &port_fops}, -#endif - {5, "zero", S_IRUGO | S_IWUGO, &zero_fops}, - {7, "full", S_IRUGO | S_IWUGO, &full_fops}, - {8, "random", S_IRUGO | S_IWUSR, &random_fops}, - {9, "urandom", S_IRUGO | S_IWUSR, &urandom_fops}, - {11,"kmsg", S_IRUGO | S_IWUSR, &kmsg_fops}, -#ifdef CONFIG_CRASH_DUMP - {12,"oldmem", S_IRUSR | S_IWUSR | S_IRGRP, &oldmem_fops}, -#endif -}; - -static struct class *mem_class; - -static int __init chr_dev_init(void) -{ - int i; - - 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"); - for (i = 0; i < ARRAY_SIZE(devlist); i++) - class_device_create(mem_class, NULL, - MKDEV(MEM_MAJOR, devlist[i].minor), - NULL, devlist[i].name); - - return 0; -} - -fs_initcall(chr_dev_init); |