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