diff options
Diffstat (limited to 'linux-2.6-xen-sparse/drivers/xen/char/mem.c')
| -rw-r--r-- | linux-2.6-xen-sparse/drivers/xen/char/mem.c | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/linux-2.6-xen-sparse/drivers/xen/char/mem.c b/linux-2.6-xen-sparse/drivers/xen/char/mem.c deleted file mode 100644 index 7e857b222e..0000000000 --- a/linux-2.6-xen-sparse/drivers/xen/char/mem.c +++ /dev/null @@ -1,203 +0,0 @@ -/* - * Originally from 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 <asm/pgalloc.h> -#include <asm/uaccess.h> -#include <asm/io.h> -#include <asm/hypervisor.h> - -#ifndef ARCH_HAS_VALID_PHYS_ADDR_RANGE -static inline int valid_phys_addr_range(unsigned long addr, size_t count) -{ - return 1; -} -#endif - -/* - * 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, ignored; - ssize_t read = 0, sz; - void __iomem *v; - - if (!valid_phys_addr_range(p, count)) - return -EFAULT; - - 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); - - v = xlate_dev_mem_ptr(p, sz); - if (IS_ERR(v) || v == NULL) { - /* - * Some programs (e.g., dmidecode) groove off into - * weird RAM areas where no tables can possibly exist - * (because Xen will have stomped on them!). These - * programs get rather upset if we let them know that - * Xen failed their access, so we fake out a read of - * all zeroes. - */ - if (clear_user(buf, count)) - return -EFAULT; - read += count; - break; - } - - ignored = copy_to_user(buf, v, sz); - xlate_dev_mem_ptr_unmap(v); - if (ignored) - 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, ignored; - ssize_t written = 0, sz; - void __iomem *v; - - if (!valid_phys_addr_range(p, count)) - return -EFAULT; - - 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); - - v = xlate_dev_mem_ptr(p, sz); - if (v == NULL) - break; - if (IS_ERR(v)) { - if (written == 0) - return PTR_ERR(v); - break; - } - - ignored = copy_from_user(v, buf, sz); - xlate_dev_mem_ptr_unmap(v); - if (ignored) { - written += sz - ignored; - if (written) - break; - return -EFAULT; - } - buf += sz; - p += sz; - count -= sz; - written += sz; - } - - *ppos += written; - return written; -} - -#ifndef ARCH_HAS_DEV_MEM_MMAP_MEM -static inline int uncached_access(struct file *file) -{ - if (file->f_flags & O_SYNC) - return 1; - /* Xen sets correct MTRR type on non-RAM for us. */ - return 0; -} - -static int xen_mmap_mem(struct file * file, struct vm_area_struct * vma) -{ - size_t size = vma->vm_end - vma->vm_start; - - if (uncached_access(file)) - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); - - /* We want to return the real error code, not EAGAIN. */ - return direct_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, - size, vma->vm_page_prot, DOMID_IO); -} -#endif - -/* - * 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_mem(struct inode * inode, struct file * filp) -{ - return capable(CAP_SYS_RAWIO) ? 0 : -EPERM; -} - -const struct file_operations mem_fops = { - .llseek = memory_lseek, - .read = read_mem, - .write = write_mem, - .mmap = xen_mmap_mem, - .open = open_mem, -}; |