xref: /openbmc/linux/arch/ia64/kernel/sys_ia64.c (revision 12eb4683)
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 
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);
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 
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 
87 asmlinkage unsigned long
88 ia64_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  */
99 asmlinkage long
100 sys_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 
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 
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 {
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 
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 
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 
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 {
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 
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 */
184