linux/arch/parisc/kernel/sys_parisc.c
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   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
  36static 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 */
  64static int get_offset(struct address_space *mapping)
  65{
  66        int offset = (unsigned long) mapping << (PAGE_SHIFT - 8);
  67        return offset & 0x3FF000;
  68}
  69
  70static 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
  90unsigned 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
 113asmlinkage 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
 123asmlinkage 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
 138asmlinkage 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
 144asmlinkage 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 */
 152asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
 153{
 154        return sys_truncate(path, length);
 155}
 156asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
 157{
 158        return sys_ftruncate(fd, length);
 159}
 160asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
 161{
 162        return sys_fcntl(fd, cmd, arg);
 163}
 164#else
 165
 166asmlinkage 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
 172asmlinkage 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
 179asmlinkage 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
 185asmlinkage 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
 191asmlinkage 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
 197asmlinkage 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
 205asmlinkage 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
 213asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
 214{
 215        return -ENOMEM;
 216}
 217
 218asmlinkage int sys_free_hugepages(unsigned long addr)
 219{
 220        return -EINVAL;
 221}
 222
 223long 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}
 237