[mirror_ubuntu-artful-kernel.git] / arch / ia64 / kernel / sys_ia64.c

/*
 * This file contains various system calls that have different calling
 * conventions on different platforms.
 *
 * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 */
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/sched/task_stack.h>
#include <linux/shm.h>
#include <linux/file.h>		/* doh, must come after sched.h... */
#include <linux/smp.h>
#include <linux/syscalls.h>
#include <linux/highuid.h>
#include <linux/hugetlb.h>

#include <asm/shmparam.h>
#include <linux/uaccess.h>

unsigned long
arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len,
			unsigned long pgoff, unsigned long flags)
{
	long map_shared = (flags & MAP_SHARED);
	unsigned long align_mask = 0;
	struct mm_struct *mm = current->mm;
	struct vm_unmapped_area_info info;

	if (len > RGN_MAP_LIMIT)
		return -ENOMEM;

	/* handle fixed mapping: prevent overlap with huge pages */
	if (flags & MAP_FIXED) {
		if (is_hugepage_only_range(mm, addr, len))
			return -EINVAL;
		return addr;
	}

#ifdef CONFIG_HUGETLB_PAGE
	if (REGION_NUMBER(addr) == RGN_HPAGE)
		addr = 0;
#endif
	if (!addr)
		addr = TASK_UNMAPPED_BASE;

	if (map_shared && (TASK_SIZE > 0xfffffffful))
		/*
		 * For 64-bit tasks, align shared segments to 1MB to avoid potential
		 * performance penalty due to virtual aliasing (see ASDM).  For 32-bit
		 * tasks, we prefer to avoid exhausting the address space too quickly by
		 * limiting alignment to a single page.
		 */
		align_mask = PAGE_MASK & (SHMLBA - 1);

	info.flags = 0;
	info.length = len;
	info.low_limit = addr;
	info.high_limit = TASK_SIZE;
	info.align_mask = align_mask;
	info.align_offset = 0;
	return vm_unmapped_area(&info);
}

asmlinkage long
ia64_getpriority (int which, int who)
{
	long prio;

	prio = sys_getpriority(which, who);
	if (prio >= 0) {
		force_successful_syscall_return();
		prio = 20 - prio;
	}
	return prio;
}

/* XXX obsolete, but leave it here until the old libc is gone... */
asmlinkage unsigned long
sys_getpagesize (void)
{
	return PAGE_SIZE;
}

asmlinkage unsigned long
ia64_brk (unsigned long brk)
{
	unsigned long retval = sys_brk(brk);
	force_successful_syscall_return();
	return retval;
}

/*
 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8
 * and r9) as this is faster than doing a copy_to_user().
 */
asmlinkage long
sys_ia64_pipe (void)
{
	struct pt_regs *regs = task_pt_regs(current);
	int fd[2];
	int retval;

	retval = do_pipe_flags(fd, 0);
	if (retval)
		goto out;
	retval = fd[0];
	regs->r9 = fd[1];
  out:
	return retval;
}

int ia64_mmap_check(unsigned long addr, unsigned long len,
		unsigned long flags)
{
	unsigned long roff;

	/*
	 * Don't permit mappings into unmapped space, the virtual page table
	 * of a region, or across a region boundary.  Note: RGN_MAP_LIMIT is
	 * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0.
	 */
	roff = REGION_OFFSET(addr);
	if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len)))
		return -EINVAL;
	return 0;
}

/*
 * mmap2() is like mmap() except that the offset is expressed in units
 * of PAGE_SIZE (instead of bytes).  This allows to mmap2() (pieces
 * of) files that are larger than the address space of the CPU.
 */
asmlinkage unsigned long
sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
{
	addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
	if (!IS_ERR((void *) addr))
		force_successful_syscall_return();
	return addr;
}

asmlinkage unsigned long
sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
{
	if (offset_in_page(off) != 0)
		return -EINVAL;

	addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
	if (!IS_ERR((void *) addr))
		force_successful_syscall_return();
	return addr;
}

asmlinkage unsigned long
ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
	     unsigned long new_addr)
{
	addr = sys_mremap(addr, old_len, new_len, flags, new_addr);
	if (!IS_ERR((void *) addr))
		force_successful_syscall_return();
	return addr;
}

#ifndef CONFIG_PCI

asmlinkage long
sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
		    void *buf)
{
	return -ENOSYS;
}

asmlinkage long
sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
		     void *buf)
{
	return -ENOSYS;
}

#endif /* CONFIG_PCI */
Commit	Line	Data
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>
01042607	13	#include <linux/sched/mm.h>
68db0cf1	14	#include <linux/sched/task_stack.h>
1da177e4 LT	15	#include <linux/shm.h>
	16	#include <linux/file.h> /* doh, must come after sched.h... */
	17	#include <linux/smp.h>
1da177e4 LT	18	#include <linux/syscalls.h>
	19	#include <linux/highuid.h>
	20	#include <linux/hugetlb.h>
	21
	22	#include <asm/shmparam.h>
7c0f6ba6	23	#include <linux/uaccess.h>
1da177e4 LT	24
	25	unsigned long
	26	arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len,
	27	unsigned long pgoff, unsigned long flags)
	28	{
	29	long map_shared = (flags & MAP_SHARED);
f53f2325	30	unsigned long align_mask = 0;
1da177e4	31	struct mm_struct *mm = current->mm;
f53f2325	32	struct vm_unmapped_area_info info;
1da177e4 LT	33
	34	if (len > RGN_MAP_LIMIT)
	35	return -ENOMEM;
	36
afa37394 BH	37	/* handle fixed mapping: prevent overlap with huge pages */
	38	if (flags & MAP_FIXED) {
	39	if (is_hugepage_only_range(mm, addr, len))
	40	return -EINVAL;
	41	return addr;
	42	}
	43
1da177e4	44	#ifdef CONFIG_HUGETLB_PAGE
0a41e250	45	if (REGION_NUMBER(addr) == RGN_HPAGE)
1da177e4 LT	46	addr = 0;
	47	#endif
	48	if (!addr)
f53f2325	49	addr = TASK_UNMAPPED_BASE;
1da177e4 LT	50
	51	if (map_shared && (TASK_SIZE > 0xfffffffful))
	52	/*
	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.
	57	*/
f53f2325	58	align_mask = PAGE_MASK & (SHMLBA - 1);
1da177e4	59
f53f2325 ML	60	info.flags = 0;
	61	info.length = len;
	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);
1da177e4 LT	67	}
	68
	69	asmlinkage long
	70	ia64_getpriority (int which, int who)
	71	{
	72	long prio;
	73
	74	prio = sys_getpriority(which, who);
	75	if (prio >= 0) {
	76	force_successful_syscall_return();
	77	prio = 20 - prio;
	78	}
	79	return prio;
	80	}
	81
	82	/* XXX obsolete, but leave it here until the old libc is gone... */
	83	asmlinkage unsigned long
	84	sys_getpagesize (void)
	85	{
	86	return PAGE_SIZE;
	87	}
	88
1da177e4 LT	89	asmlinkage unsigned long
	90	ia64_brk (unsigned long brk)
	91	{
bb52d669	92	unsigned long retval = sys_brk(brk);
1da177e4 LT	93	force_successful_syscall_return();
	94	return retval;
	95	}
	96
	97	/*
	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().
	100	*/
	101	asmlinkage long
1134723e	102	sys_ia64_pipe (void)
1da177e4	103	{
6450578f	104	struct pt_regs *regs = task_pt_regs(current);
1da177e4 LT	105	int fd[2];
	106	int retval;
	107
ed8cae8b	108	retval = do_pipe_flags(fd, 0);
1da177e4 LT	109	if (retval)
	110	goto out;
	111	retval = fd[0];
	112	regs->r9 = fd[1];
	113	out:
	114	return retval;
	115	}
	116
3a459756 KK	117	int ia64_mmap_check(unsigned long addr, unsigned long len,
	118	unsigned long flags)
	119	{
	120	unsigned long roff;
	121
	122	/*
	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.
	126	*/
	127	roff = REGION_OFFSET(addr);
	128	if ((len > RGN_MAP_LIMIT) \|\| (roff > (RGN_MAP_LIMIT - len)))
	129	return -EINVAL;
	130	return 0;
	131	}
	132
1da177e4 LT	133	/*
	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.
	137	*/
	138	asmlinkage unsigned long
	139	sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
	140	{
f8b72560	141	addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
1da177e4 LT	142	if (!IS_ERR((void *) addr))
	143	force_successful_syscall_return();
	144	return addr;
	145	}
	146
	147	asmlinkage unsigned long
	148	sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
	149	{
	150	if (offset_in_page(off) != 0)
	151	return -EINVAL;
	152
f8b72560	153	addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
1da177e4 LT	154	if (!IS_ERR((void *) addr))
	155	force_successful_syscall_return();
	156	return addr;
	157	}
	158
	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)
	162	{
657bec85 AV	163	addr = sys_mremap(addr, old_len, new_len, flags, new_addr);
	164	if (!IS_ERR((void *) addr))
	165	force_successful_syscall_return();
1da177e4 LT	166	return addr;
	167	}
	168
	169	#ifndef CONFIG_PCI
	170
	171	asmlinkage long
	172	sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
	173	void *buf)
	174	{
	175	return -ENOSYS;
	176	}
	177
	178	asmlinkage long
	179	sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
	180	void *buf)
	181	{
	182	return -ENOSYS;
	183	}
	184
	185	#endif /* CONFIG_PCI */