arch/ia64/kernel/sys_ia64.c

   1 /*
   2  * This file contains various system calls that have different calling
   3  * conventions on different platforms.
   4  *
   5  * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  */
   8 #include <linux/errno.h>
   9 #include <linux/fs.h>
  10 #include <linux/mm.h>
  11 #include <linux/mman.h>
  12 #include <linux/sched.h>
  13 #include <linux/shm.h>
  14 #include <linux/file.h>         /* doh, must come after sched.h... */
  15 #include <linux/smp.h>
  16 #include <linux/syscalls.h>
  17 #include <linux/highuid.h>
  18 #include <linux/hugetlb.h>
  19
  20 #include <asm/shmparam.h>
  21 #include <linux/uaccess.h>
  22
  23 unsigned long
  24 arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len,
  25                         unsigned long pgoff, unsigned long flags)
  26 {
  27         long map_shared = (flags & MAP_SHARED);
  28         unsigned long align_mask = 0;
  29         struct mm_struct *mm = current->mm;
  30         struct vm_unmapped_area_info info;
  31
  32         if (len > RGN_MAP_LIMIT)
  33                 return -ENOMEM;
  34
  35         /* handle fixed mapping: prevent overlap with huge pages */
  36         if (flags & MAP_FIXED) {
  37                 if (is_hugepage_only_range(mm, addr, len))
  38                         return -EINVAL;
  39                 return addr;
  40         }
  41
  42 #ifdef CONFIG_HUGETLB_PAGE
  43         if (REGION_NUMBER(addr) == RGN_HPAGE)
  44                 addr = 0;
  45 #endif
  46         if (!addr)
  47                 addr = TASK_UNMAPPED_BASE;
  48
  49         if (map_shared && (TASK_SIZE > 0xfffffffful))
  50                 /*
  51                  * For 64-bit tasks, align shared segments to 1MB to avoid potential
  52                  * performance penalty due to virtual aliasing (see ASDM).  For 32-bit
  53                  * tasks, we prefer to avoid exhausting the address space too quickly by
  54                  * limiting alignment to a single page.
  55                  */
  56                 align_mask = PAGE_MASK & (SHMLBA - 1);
  57
  58         info.flags = 0;
  59         info.length = len;
  60         info.low_limit = addr;
  61         info.high_limit = TASK_SIZE;
  62         info.align_mask = align_mask;
  63         info.align_offset = 0;
  64         return vm_unmapped_area(&info);
  65 }
  66
  67 asmlinkage long
  68 ia64_getpriority (int which, int who)
  69 {
  70         long prio;
  71
  72         prio = sys_getpriority(which, who);
  73         if (prio >= 0) {
  74                 force_successful_syscall_return();
  75                 prio = 20 - prio;
  76         }
  77         return prio;
  78 }
  79
  80 /* XXX obsolete, but leave it here until the old libc is gone... */
  81 asmlinkage unsigned long
  82 sys_getpagesize (void)
  83 {
  84         return PAGE_SIZE;
  85 }
  86
  87 asmlinkage unsigned long
  88 ia64_brk (unsigned long brk)
  89 {
  90         unsigned long retval = sys_brk(brk);
  91         force_successful_syscall_return();
  92         return retval;
  93 }
  94
  95 /*
  96  * On IA-64, we return the two file descriptors in ret0 and ret1 (r8
  97  * and r9) as this is faster than doing a copy_to_user().
  98  */
  99 asmlinkage long
 100 sys_ia64_pipe (void)
 101 {
 102         struct pt_regs *regs = task_pt_regs(current);
 103         int fd[2];
 104         int retval;
 105
 106         retval = do_pipe_flags(fd, 0);
 107         if (retval)
 108                 goto out;
 109         retval = fd[0];
 110         regs->r9 = fd[1];
 111   out:
 112         return retval;
 113 }
 114
 115 int ia64_mmap_check(unsigned long addr, unsigned long len,
 116                 unsigned long flags)
 117 {
 118         unsigned long roff;
 119
 120         /*
 121          * Don't permit mappings into unmapped space, the virtual page table
 122          * of a region, or across a region boundary.  Note: RGN_MAP_LIMIT is
 123          * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0.
 124          */
 125         roff = REGION_OFFSET(addr);
 126         if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len)))
 127                 return -EINVAL;
 128         return 0;
 129 }
 130
 131 /*
 132  * mmap2() is like mmap() except that the offset is expressed in units
 133  * of PAGE_SIZE (instead of bytes).  This allows to mmap2() (pieces
 134  * of) files that are larger than the address space of the CPU.
 135  */
 136 asmlinkage unsigned long
 137 sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
 138 {
 139         addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
 140         if (!IS_ERR((void *) addr))
 141                 force_successful_syscall_return();
 142         return addr;
 143 }
 144
 145 asmlinkage unsigned long
 146 sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
 147 {
 148         if (offset_in_page(off) != 0)
 149                 return -EINVAL;
 150
 151         addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 152         if (!IS_ERR((void *) addr))
 153                 force_successful_syscall_return();
 154         return addr;
 155 }
 156
 157 asmlinkage unsigned long
 158 ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
 159              unsigned long new_addr)
 160 {
 161         addr = sys_mremap(addr, old_len, new_len, flags, new_addr);
 162         if (!IS_ERR((void *) addr))
 163                 force_successful_syscall_return();
 164         return addr;
 165 }
 166
 167 #ifndef CONFIG_PCI
 168
 169 asmlinkage long
 170 sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
 171                     void *buf)
 172 {
 173         return -ENOSYS;
 174 }
 175
 176 asmlinkage long
 177 sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
 178                      void *buf)
 179 {
 180         return -ENOSYS;
 181 }
 182
 183 #endif /* CONFIG_PCI */