LXR linux/arch/ia64/kernel/sys

   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 <asm/uaccess.h>
  22
  23unsigned long
  24arch_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
  67asmlinkage long
  68ia64_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... */
  81asmlinkage unsigned long
  82sys_getpagesize (void)
  83{
  84        return PAGE_SIZE;
  85}
  86
  87asmlinkage unsigned long
  88ia64_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 */
  99asmlinkage long
 100sys_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
 115int 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 */
 136asmlinkage unsigned long
 137sys_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
 145asmlinkage unsigned long
 146sys_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
 157asmlinkage unsigned long
 158ia64_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
 169asmlinkage long
 170sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
 171                    void *buf)
 172{
 173        return -ENOSYS;
 174}
 175
 176asmlinkage long
 177sys_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 */
 184