arch/parisc/kernel/sys_parisc.c

   1
   2 /*
   3  *    PARISC specific syscalls
   4  *
   5  *    Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
   6  *    Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
   7  *    Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
   8  *
   9  *
  10  *    This program is free software; you can redistribute it and/or modify
  11  *    it under the terms of the GNU General Public License as published by
  12  *    the Free Software Foundation; either version 2 of the License, or
  13  *    (at your option) any later version.
  14  *
  15  *    This program is distributed in the hope that it will be useful,
  16  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *    GNU General Public License for more details.
  19  *
  20  *    You should have received a copy of the GNU General Public License
  21  *    along with this program; if not, write to the Free Software
  22  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include <asm/uaccess.h>
  26 #include <linux/file.h>
  27 #include <linux/fs.h>
  28 #include <linux/linkage.h>
  29 #include <linux/mm.h>
  30 #include <linux/mman.h>
  31 #include <linux/shm.h>
  32 #include <linux/syscalls.h>
  33 #include <linux/utsname.h>
  34 #include <linux/personality.h>
  35
  36 static unsigned long get_unshared_area(unsigned long addr, unsigned long len)
  37 {
  38         struct vm_area_struct *vma;
  39
  40         addr = PAGE_ALIGN(addr);
  41
  42         for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
  43                 /* At this point:  (!vma || addr < vma->vm_end). */
  44                 if (TASK_SIZE - len < addr)
  45                         return -ENOMEM;
  46                 if (!vma || addr + len <= vma->vm_start)
  47                         return addr;
  48                 addr = vma->vm_end;
  49         }
  50 }
  51
  52 #define DCACHE_ALIGN(addr) (((addr) + (SHMLBA - 1)) &~ (SHMLBA - 1))
  53
  54 /*
  55  * We need to know the offset to use.  Old scheme was to look for
  56  * existing mapping and use the same offset.  New scheme is to use the
  57  * address of the kernel data structure as the seed for the offset.
  58  * We'll see how that works...
  59  *
  60  * The mapping is cacheline aligned, so there's no information in the bottom
  61  * few bits of the address.  We're looking for 10 bits (4MB / 4k), so let's
  62  * drop the bottom 8 bits and use bits 8-17.
  63  */
  64 static int get_offset(struct address_space *mapping)
  65 {
  66         int offset = (unsigned long) mapping << (PAGE_SHIFT - 8);
  67         return offset & 0x3FF000;
  68 }
  69
  70 static unsigned long get_shared_area(struct address_space *mapping,
  71                 unsigned long addr, unsigned long len, unsigned long pgoff)
  72 {
  73         struct vm_area_struct *vma;
  74         int offset = mapping ? get_offset(mapping) : 0;
  75
  76         addr = DCACHE_ALIGN(addr - offset) + offset;
  77
  78         for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
  79                 /* At this point:  (!vma || addr < vma->vm_end). */
  80                 if (TASK_SIZE - len < addr)
  81                         return -ENOMEM;
  82                 if (!vma || addr + len <= vma->vm_start)
  83                         return addr;
  84                 addr = DCACHE_ALIGN(vma->vm_end - offset) + offset;
  85                 if (addr < vma->vm_end) /* handle wraparound */
  86                         return -ENOMEM;
  87         }
  88 }
  89
  90 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
  91                 unsigned long len, unsigned long pgoff, unsigned long flags)
  92 {
  93         if (len > TASK_SIZE)
  94                 return -ENOMEM;
  95         /* Might want to check for cache aliasing issues for MAP_FIXED case
  96          * like ARM or MIPS ??? --BenH.
  97          */
  98         if (flags & MAP_FIXED)
  99                 return addr;
 100         if (!addr)
 101                 addr = TASK_UNMAPPED_BASE;
 102
 103         if (filp) {
 104                 addr = get_shared_area(filp->f_mapping, addr, len, pgoff);
 105         } else if(flags & MAP_SHARED) {
 106                 addr = get_shared_area(NULL, addr, len, pgoff);
 107         } else {
 108                 addr = get_unshared_area(addr, len);
 109         }
 110         return addr;
 111 }
 112
 113 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 114         unsigned long prot, unsigned long flags, unsigned long fd,
 115         unsigned long pgoff)
 116 {
 117         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 118            we have. */
 119         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 120                               pgoff >> (PAGE_SHIFT - 12));
 121 }
 122
 123 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 124                 unsigned long prot, unsigned long flags, unsigned long fd,
 125                 unsigned long offset)
 126 {
 127         if (!(offset & ~PAGE_MASK)) {
 128                 return sys_mmap_pgoff(addr, len, prot, flags, fd,
 129                                         offset >> PAGE_SHIFT);
 130         } else {
 131                 return -EINVAL;
 132         }
 133 }
 134
 135 /* Fucking broken ABI */
 136
 137 #ifdef CONFIG_64BIT
 138 asmlinkage long parisc_truncate64(const char __user * path,
 139                                         unsigned int high, unsigned int low)
 140 {
 141         return sys_truncate(path, (long)high << 32 | low);
 142 }
 143
 144 asmlinkage long parisc_ftruncate64(unsigned int fd,
 145                                         unsigned int high, unsigned int low)
 146 {
 147         return sys_ftruncate(fd, (long)high << 32 | low);
 148 }
 149
 150 /* stubs for the benefit of the syscall_table since truncate64 and truncate
 151  * are identical on LP64 */
 152 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
 153 {
 154         return sys_truncate(path, length);
 155 }
 156 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
 157 {
 158         return sys_ftruncate(fd, length);
 159 }
 160 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
 161 {
 162         return sys_fcntl(fd, cmd, arg);
 163 }
 164 #else
 165
 166 asmlinkage long parisc_truncate64(const char __user * path,
 167                                         unsigned int high, unsigned int low)
 168 {
 169         return sys_truncate64(path, (loff_t)high << 32 | low);
 170 }
 171
 172 asmlinkage long parisc_ftruncate64(unsigned int fd,
 173                                         unsigned int high, unsigned int low)
 174 {
 175         return sys_ftruncate64(fd, (loff_t)high << 32 | low);
 176 }
 177 #endif
 178
 179 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
 180                                         unsigned int high, unsigned int low)
 181 {
 182         return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
 183 }
 184
 185 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
 186                         size_t count, unsigned int high, unsigned int low)
 187 {
 188         return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
 189 }
 190
 191 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
 192                                     size_t count)
 193 {
 194         return sys_readahead(fd, (loff_t)high << 32 | low, count);
 195 }
 196
 197 asmlinkage long parisc_fadvise64_64(int fd,
 198                         unsigned int high_off, unsigned int low_off,
 199                         unsigned int high_len, unsigned int low_len, int advice)
 200 {
 201         return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
 202                         (loff_t)high_len << 32 | low_len, advice);
 203 }
 204
 205 asmlinkage long parisc_sync_file_range(int fd,
 206                         u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
 207                         unsigned int flags)
 208 {
 209         return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
 210                         (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
 211 }
 212
 213 asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
 214 {
 215         return -ENOMEM;
 216 }
 217
 218 asmlinkage int sys_free_hugepages(unsigned long addr)
 219 {
 220         return -EINVAL;
 221 }
 222
 223 long parisc_personality(unsigned long personality)
 224 {
 225         long err;
 226
 227         if (personality(current->personality) == PER_LINUX32
 228             && personality == PER_LINUX)
 229                 personality = PER_LINUX32;
 230
 231         err = sys_personality(personality);
 232         if (err == PER_LINUX32)
 233                 err = PER_LINUX;
 234
 235         return err;
 236 }