diff options
| -rw-r--r-- | drivers/char/mem.c | 204 |
1 files changed, 102 insertions, 102 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index e3f5577cbce..1f3215ac085 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -3,7 +3,7 @@ * * Copyright (C) 1991, 1992 Linus Torvalds * - * Added devfs support. + * 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> */ @@ -44,36 +44,6 @@ static inline unsigned long size_inside_page(unsigned long start, return min(sz, size); } -/* - * 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(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 -} - #ifndef ARCH_HAS_VALID_PHYS_ADDR_RANGE static inline int valid_phys_addr_range(unsigned long addr, size_t count) { @@ -115,15 +85,15 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size) } #endif -void __attribute__((weak)) unxlate_dev_mem_ptr(unsigned long phys, void *addr) +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. + * 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, +static ssize_t read_mem(struct file *file, char __user *buf, size_t count, loff_t *ppos) { unsigned long p = *ppos; @@ -140,10 +110,10 @@ static ssize_t read_mem(struct file * file, char __user * buf, if (sz > 0) { if (clear_user(buf, sz)) return -EFAULT; - buf += sz; - p += sz; - count -= sz; - read += sz; + buf += sz; + p += sz; + count -= sz; + read += sz; } } #endif @@ -157,9 +127,9 @@ static ssize_t read_mem(struct file * file, char __user * buf, 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 + * 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) @@ -180,7 +150,7 @@ static ssize_t read_mem(struct file * file, char __user * buf, return read; } -static ssize_t write_mem(struct file * file, const char __user * buf, +static ssize_t write_mem(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { unsigned long p = *ppos; @@ -212,9 +182,9 @@ static ssize_t write_mem(struct file * file, const char __user * buf, 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 + * 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) { @@ -242,13 +212,46 @@ static ssize_t write_mem(struct file * file, const char __user * buf, return written; } -int __attribute__((weak)) phys_mem_access_prot_allowed(struct file *file, +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. + * + */ +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 +} + static pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, pgprot_t vma_prot) { @@ -294,7 +297,7 @@ static const struct vm_operations_struct mmap_mem_ops = { #endif }; -static int mmap_mem(struct file * file, struct vm_area_struct * vma) +static int mmap_mem(struct file *file, struct vm_area_struct *vma) { size_t size = vma->vm_end - vma->vm_start; @@ -329,7 +332,7 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma) } #ifdef CONFIG_DEVKMEM -static int mmap_kmem(struct file * file, struct vm_area_struct * vma) +static int mmap_kmem(struct file *file, struct vm_area_struct *vma) { unsigned long pfn; @@ -337,9 +340,9 @@ static int mmap_kmem(struct file * file, struct vm_area_struct * vma) 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: 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. */ @@ -389,7 +392,7 @@ static ssize_t read_oldmem(struct file *file, char __user *buf, /* * This function reads the *virtual* memory as seen by the kernel. */ -static ssize_t read_kmem(struct file *file, char __user *buf, +static ssize_t read_kmem(struct file *file, char __user *buf, size_t count, loff_t *ppos) { unsigned long p = *ppos; @@ -400,8 +403,8 @@ static ssize_t read_kmem(struct file *file, char __user *buf, 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; + 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.. */ @@ -465,9 +468,8 @@ static ssize_t read_kmem(struct file *file, char __user *buf, } -static inline ssize_t -do_write_kmem(unsigned long p, const char __user *buf, - size_t count, loff_t *ppos) +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; @@ -491,9 +493,9 @@ do_write_kmem(unsigned long p, const char __user *buf, 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 + * 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); @@ -514,11 +516,10 @@ do_write_kmem(unsigned long p, const char __user *buf, 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, +static ssize_t write_kmem(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { unsigned long p = *ppos; @@ -570,17 +571,17 @@ static ssize_t write_kmem(struct file * file, const char __user * buf, #endif #ifdef CONFIG_DEVPORT -static ssize_t read_port(struct file * file, char __user * buf, +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; + return -EFAULT; while (count-- > 0 && i < 65536) { - if (__put_user(inb(i),tmp) < 0) - return -EFAULT; + if (__put_user(inb(i), tmp) < 0) + return -EFAULT; i++; tmp++; } @@ -588,22 +589,22 @@ static ssize_t read_port(struct file * file, char __user * buf, return tmp-buf; } -static ssize_t write_port(struct file * file, const char __user * 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)) + 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; + return -EFAULT; } - outb(c,i); + outb(c, i); i++; tmp++; } @@ -612,13 +613,13 @@ static ssize_t write_port(struct file * file, const char __user * buf, } #endif -static ssize_t read_null(struct file * file, char __user * buf, +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, +static ssize_t write_null(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { return count; @@ -630,13 +631,13 @@ static int pipe_to_null(struct pipe_inode_info *info, struct pipe_buffer *buf, return sd->len; } -static ssize_t splice_write_null(struct pipe_inode_info *pipe,struct file *out, +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, +static ssize_t read_zero(struct file *file, char __user *buf, size_t count, loff_t *ppos) { size_t written; @@ -667,7 +668,7 @@ static ssize_t read_zero(struct file * file, char __user * buf, return written ? written : -EFAULT; } -static int mmap_zero(struct file * file, struct vm_area_struct * vma) +static int mmap_zero(struct file *file, struct vm_area_struct *vma) { #ifndef CONFIG_MMU return -ENOSYS; @@ -677,7 +678,7 @@ static int mmap_zero(struct file * file, struct vm_area_struct * vma) return 0; } -static ssize_t write_full(struct file * file, const char __user * buf, +static ssize_t write_full(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { return -ENOSPC; @@ -688,8 +689,7 @@ static ssize_t write_full(struct file * file, const char __user * buf, * 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) +static loff_t null_lseek(struct file *file, loff_t offset, int orig) { return file->f_pos = 0; } @@ -702,31 +702,31 @@ static loff_t null_lseek(struct file * file, loff_t offset, int orig) * 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) +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; - if ((unsigned long long)offset < - (unsigned long long)file->f_pos) { - ret = -EOVERFLOW; - break; - } - 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(); + case SEEK_CUR: + offset += file->f_pos; + if ((unsigned long long)offset < + (unsigned long long)file->f_pos) { + ret = -EOVERFLOW; + break; + } + case SEEK_SET: + /* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */ + if ((unsigned long long)offset >= ~0xFFFULL) { + ret = -EOVERFLOW; break; - default: - ret = -EINVAL; + } + 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; @@ -810,7 +810,7 @@ static const struct file_operations oldmem_fops = { }; #endif -static ssize_t kmsg_write(struct file * file, const char __user * buf, +static ssize_t kmsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { char *tmp; @@ -832,7 +832,7 @@ static ssize_t kmsg_write(struct file * file, const char __user * buf, } static const struct file_operations kmsg_fops = { - .write = kmsg_write, + .write = kmsg_write, }; static const struct memdev { @@ -883,7 +883,7 @@ static int memory_open(struct inode *inode, struct file *filp) } static const struct file_operations memory_fops = { - .open = memory_open, + .open = memory_open, }; static char *mem_devnode(struct device *dev, mode_t *mode) @@ -904,7 +904,7 @@ static int __init chr_dev_init(void) if (err) return err; - if (register_chrdev(MEM_MAJOR,"mem",&memory_fops)) + 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"); |