Commit | Line | Data |
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1da177e4 LT |
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 | */ | |
1da177e4 LT |
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> | |
1da177e4 LT |
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 | ||
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); | |
f53f2325 | 28 | unsigned long align_mask = 0; |
1da177e4 | 29 | struct mm_struct *mm = current->mm; |
f53f2325 | 30 | struct vm_unmapped_area_info info; |
1da177e4 LT |
31 | |
32 | if (len > RGN_MAP_LIMIT) | |
33 | return -ENOMEM; | |
34 | ||
afa37394 BH |
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 | ||
1da177e4 | 42 | #ifdef CONFIG_HUGETLB_PAGE |
0a41e250 | 43 | if (REGION_NUMBER(addr) == RGN_HPAGE) |
1da177e4 LT |
44 | addr = 0; |
45 | #endif | |
46 | if (!addr) | |
f53f2325 | 47 | addr = TASK_UNMAPPED_BASE; |
1da177e4 LT |
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 | */ | |
f53f2325 | 56 | align_mask = PAGE_MASK & (SHMLBA - 1); |
1da177e4 | 57 | |
f53f2325 ML |
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); | |
1da177e4 LT |
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 | ||
1da177e4 LT |
87 | asmlinkage unsigned long |
88 | ia64_brk (unsigned long brk) | |
89 | { | |
bb52d669 | 90 | unsigned long retval = sys_brk(brk); |
1da177e4 LT |
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 | |
1134723e | 100 | sys_ia64_pipe (void) |
1da177e4 | 101 | { |
6450578f | 102 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
103 | int fd[2]; |
104 | int retval; | |
105 | ||
ed8cae8b | 106 | retval = do_pipe_flags(fd, 0); |
1da177e4 LT |
107 | if (retval) |
108 | goto out; | |
109 | retval = fd[0]; | |
110 | regs->r9 = fd[1]; | |
111 | out: | |
112 | return retval; | |
113 | } | |
114 | ||
3a459756 KK |
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 | ||
1da177e4 LT |
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 | { | |
f8b72560 | 139 | addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff); |
1da177e4 LT |
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 | ||
f8b72560 | 151 | addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); |
1da177e4 LT |
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 | { | |
657bec85 AV |
161 | addr = sys_mremap(addr, old_len, new_len, flags, new_addr); |
162 | if (!IS_ERR((void *) addr)) | |
163 | force_successful_syscall_return(); | |
1da177e4 LT |
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 */ |