linux/arch/ia64/kernel/sys_ia64.c
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   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 start_addr, align_mask = PAGE_SIZE - 1;
  29        struct mm_struct *mm = current->mm;
  30        struct vm_area_struct *vma;
  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 = mm->free_area_cache;
  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 = SHMLBA - 1;
  57
  58  full_search:
  59        start_addr = addr = (addr + align_mask) & ~align_mask;
  60
  61        for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
  62                /* At this point:  (!vma || addr < vma->vm_end). */
  63                if (TASK_SIZE - len < addr || RGN_MAP_LIMIT - len < REGION_OFFSET(addr)) {
  64                        if (start_addr != TASK_UNMAPPED_BASE) {
  65                                /* Start a new search --- just in case we missed some holes.  */
  66                                addr = TASK_UNMAPPED_BASE;
  67                                goto full_search;
  68                        }
  69                        return -ENOMEM;
  70                }
  71                if (!vma || addr + len <= vma->vm_start) {
  72                        /* Remember the address where we stopped this search:  */
  73                        mm->free_area_cache = addr + len;
  74                        return addr;
  75                }
  76                addr = (vma->vm_end + align_mask) & ~align_mask;
  77        }
  78}
  79
  80asmlinkage long
  81ia64_getpriority (int which, int who)
  82{
  83        long prio;
  84
  85        prio = sys_getpriority(which, who);
  86        if (prio >= 0) {
  87                force_successful_syscall_return();
  88                prio = 20 - prio;
  89        }
  90        return prio;
  91}
  92
  93/* XXX obsolete, but leave it here until the old libc is gone... */
  94asmlinkage unsigned long
  95sys_getpagesize (void)
  96{
  97        return PAGE_SIZE;
  98}
  99
 100asmlinkage unsigned long
 101ia64_brk (unsigned long brk)
 102{
 103        unsigned long retval = sys_brk(brk);
 104        force_successful_syscall_return();
 105        return retval;
 106}
 107
 108/*
 109 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8
 110 * and r9) as this is faster than doing a copy_to_user().
 111 */
 112asmlinkage long
 113sys_ia64_pipe (void)
 114{
 115        struct pt_regs *regs = task_pt_regs(current);
 116        int fd[2];
 117        int retval;
 118
 119        retval = do_pipe_flags(fd, 0);
 120        if (retval)
 121                goto out;
 122        retval = fd[0];
 123        regs->r9 = fd[1];
 124  out:
 125        return retval;
 126}
 127
 128int ia64_mmap_check(unsigned long addr, unsigned long len,
 129                unsigned long flags)
 130{
 131        unsigned long roff;
 132
 133        /*
 134         * Don't permit mappings into unmapped space, the virtual page table
 135         * of a region, or across a region boundary.  Note: RGN_MAP_LIMIT is
 136         * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0.
 137         */
 138        roff = REGION_OFFSET(addr);
 139        if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len)))
 140                return -EINVAL;
 141        return 0;
 142}
 143
 144/*
 145 * mmap2() is like mmap() except that the offset is expressed in units
 146 * of PAGE_SIZE (instead of bytes).  This allows to mmap2() (pieces
 147 * of) files that are larger than the address space of the CPU.
 148 */
 149asmlinkage unsigned long
 150sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
 151{
 152        addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
 153        if (!IS_ERR((void *) addr))
 154                force_successful_syscall_return();
 155        return addr;
 156}
 157
 158asmlinkage unsigned long
 159sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
 160{
 161        if (offset_in_page(off) != 0)
 162                return -EINVAL;
 163
 164        addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 165        if (!IS_ERR((void *) addr))
 166                force_successful_syscall_return();
 167        return addr;
 168}
 169
 170asmlinkage unsigned long
 171ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
 172             unsigned long new_addr)
 173{
 174        extern unsigned long do_mremap (unsigned long addr,
 175                                        unsigned long old_len,
 176                                        unsigned long new_len,
 177                                        unsigned long flags,
 178                                        unsigned long new_addr);
 179
 180        down_write(&current->mm->mmap_sem);
 181        {
 182                addr = do_mremap(addr, old_len, new_len, flags, new_addr);
 183        }
 184        up_write(&current->mm->mmap_sem);
 185
 186        if (IS_ERR((void *) addr))
 187                return addr;
 188
 189        force_successful_syscall_return();
 190        return addr;
 191}
 192
 193#ifndef CONFIG_PCI
 194
 195asmlinkage long
 196sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
 197                    void *buf)
 198{
 199        return -ENOSYS;
 200}
 201
 202asmlinkage long
 203sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
 204                     void *buf)
 205{
 206        return -ENOSYS;
 207}
 208
 209#endif /* CONFIG_PCI */
 210