2 * This file contains various system calls that have different calling
3 * conventions on different platforms.
5 * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co
6 * David Mosberger-Tang <davidm@hpl.hp.com>
8 #include <linux/errno.h>
11 #include <linux/mman.h>
12 #include <linux/sched.h>
13 #include <linux/sched/mm.h>
14 #include <linux/sched/task_stack.h>
15 #include <linux/shm.h>
16 #include <linux/file.h> /* doh, must come after sched.h... */
17 #include <linux/smp.h>
18 #include <linux/syscalls.h>
19 #include <linux/highuid.h>
20 #include <linux/hugetlb.h>
22 #include <asm/shmparam.h>
23 #include <linux/uaccess.h>
26 arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len,
27 unsigned long pgoff, unsigned long flags)
29 long map_shared = (flags & MAP_SHARED);
30 unsigned long align_mask = 0;
31 struct mm_struct *mm = current->mm;
32 struct vm_unmapped_area_info info;
34 if (len > RGN_MAP_LIMIT)
37 /* handle fixed mapping: prevent overlap with huge pages */
38 if (flags & MAP_FIXED) {
39 if (is_hugepage_only_range(mm, addr, len))
44 #ifdef CONFIG_HUGETLB_PAGE
45 if (REGION_NUMBER(addr) == RGN_HPAGE)
49 addr = TASK_UNMAPPED_BASE;
51 if (map_shared && (TASK_SIZE > 0xfffffffful))
53 * For 64-bit tasks, align shared segments to 1MB to avoid potential
54 * performance penalty due to virtual aliasing (see ASDM). For 32-bit
55 * tasks, we prefer to avoid exhausting the address space too quickly by
56 * limiting alignment to a single page.
58 align_mask = PAGE_MASK & (SHMLBA - 1);
62 info.low_limit = addr;
63 info.high_limit = TASK_SIZE;
64 info.align_mask = align_mask;
65 info.align_offset = 0;
66 return vm_unmapped_area(&info);
70 ia64_getpriority (int which, int who)
74 prio = sys_getpriority(which, who);
76 force_successful_syscall_return();
82 /* XXX obsolete, but leave it here until the old libc is gone... */
83 asmlinkage unsigned long
84 sys_getpagesize (void)
89 asmlinkage unsigned long
90 ia64_brk (unsigned long brk)
92 unsigned long retval = sys_brk(brk);
93 force_successful_syscall_return();
98 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8
99 * and r9) as this is faster than doing a copy_to_user().
104 struct pt_regs *regs = task_pt_regs(current);
108 retval = do_pipe_flags(fd, 0);
117 int ia64_mmap_check(unsigned long addr, unsigned long len,
123 * Don't permit mappings into unmapped space, the virtual page table
124 * of a region, or across a region boundary. Note: RGN_MAP_LIMIT is
125 * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0.
127 roff = REGION_OFFSET(addr);
128 if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len)))
134 * mmap2() is like mmap() except that the offset is expressed in units
135 * of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces
136 * of) files that are larger than the address space of the CPU.
138 asmlinkage unsigned long
139 sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
141 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
142 if (!IS_ERR((void *) addr))
143 force_successful_syscall_return();
147 asmlinkage unsigned long
148 sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
150 if (offset_in_page(off) != 0)
153 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
154 if (!IS_ERR((void *) addr))
155 force_successful_syscall_return();
159 asmlinkage unsigned long
160 ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
161 unsigned long new_addr)
163 addr = sys_mremap(addr, old_len, new_len, flags, new_addr);
164 if (!IS_ERR((void *) addr))
165 force_successful_syscall_return();
172 sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
179 sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
185 #endif /* CONFIG_PCI */