[mirror_ubuntu-bionic-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/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 <asm/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 start_addr, align_mask = PAGE_SIZE - 1;
	struct mm_struct *mm = current->mm;
	struct vm_area_struct *vma;

	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 = mm->free_area_cache;

	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 = SHMLBA - 1;

  full_search:
	start_addr = addr = (addr + align_mask) & ~align_mask;

	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
		/* At this point:  (!vma || addr < vma->vm_end). */
		if (TASK_SIZE - len < addr || RGN_MAP_LIMIT - len < REGION_OFFSET(addr)) {
			if (start_addr != TASK_UNMAPPED_BASE) {
				/* Start a new search --- just in case we missed some holes.  */
				addr = TASK_UNMAPPED_BASE;
				goto full_search;
			}
			return -ENOMEM;
		}
		if (!vma || addr + len <= vma->vm_start) {
			/* Remember the address where we stopped this search:  */
			mm->free_area_cache = addr + len;
			return addr;
		}
		addr = (vma->vm_end + align_mask) & ~align_mask;
	}
}

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)
{
	extern unsigned long do_mremap (unsigned long addr,
					unsigned long old_len,
					unsigned long new_len,
					unsigned long flags,
					unsigned long new_addr);

	down_write(&current->mm->mmap_sem);
	{
		addr = do_mremap(addr, old_len, new_len, flags, new_addr);
	}
	up_write(&current->mm->mmap_sem);

	if (IS_ERR((void *) addr))
		return 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>
	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);
	28	unsigned long start_addr, align_mask = PAGE_SIZE - 1;
	29	struct mm_struct *mm = current->mm;
	30	struct vm_area_struct *vma;
	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)
	47	addr = mm->free_area_cache;
	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 = SHMLBA - 1;
	57
	58	full_search:
	59	start_addr = addr = (addr + align_mask) & ~align_mask;
	60
	61	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
	62	/* At this point: (!vma \|\| addr < vma->vm_end). */
	63	if (TASK_SIZE - len < addr \|\| RGN_MAP_LIMIT - len < REGION_OFFSET(addr)) {
	64	if (start_addr != TASK_UNMAPPED_BASE) {
	65	/* Start a new search --- just in case we missed some holes. */
	66	addr = TASK_UNMAPPED_BASE;
	67	goto full_search;
	68	}
	69	return -ENOMEM;
	70	}
	71	if (!vma \|\| addr + len <= vma->vm_start) {
	72	/* Remember the address where we stopped this search: */
	73	mm->free_area_cache = addr + len;
	74	return addr;
	75	}
	76	addr = (vma->vm_end + align_mask) & ~align_mask;
	77	}
	78	}
	79
	80	asmlinkage long
	81	ia64_getpriority (int which, int who)
	82	{
	83	long prio;
	84
	85	prio = sys_getpriority(which, who);
	86	if (prio >= 0) {
	87	force_successful_syscall_return();
	88	prio = 20 - prio;
	89	}
	90	return prio;
	91	}
	92
	93	/* XXX obsolete, but leave it here until the old libc is gone... */
	94	asmlinkage unsigned long
	95	sys_getpagesize (void)
	96	{
	97	return PAGE_SIZE;
	98	}
	99
1da177e4 LT	100	asmlinkage unsigned long
	101	ia64_brk (unsigned long brk)
	102	{
bb52d669	103	unsigned long retval = sys_brk(brk);
1da177e4 LT	104	force_successful_syscall_return();
	105	return retval;
	106	}
	107
	108	/*
	109	* On IA-64, we return the two file descriptors in ret0 and ret1 (r8
	110	* and r9) as this is faster than doing a copy_to_user().
	111	*/
	112	asmlinkage long
1134723e	113	sys_ia64_pipe (void)
1da177e4	114	{
6450578f	115	struct pt_regs *regs = task_pt_regs(current);
1da177e4 LT	116	int fd[2];
	117	int retval;
	118
ed8cae8b	119	retval = do_pipe_flags(fd, 0);
1da177e4 LT	120	if (retval)
	121	goto out;
	122	retval = fd[0];
	123	regs->r9 = fd[1];
	124	out:
	125	return retval;
	126	}
	127
3a459756 KK	128	int ia64_mmap_check(unsigned long addr, unsigned long len,
	129	unsigned long flags)
	130	{
	131	unsigned long roff;
	132
	133	/*
	134	* Don't permit mappings into unmapped space, the virtual page table
	135	* of a region, or across a region boundary. Note: RGN_MAP_LIMIT is
	136	* equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0.
	137	*/
	138	roff = REGION_OFFSET(addr);
	139	if ((len > RGN_MAP_LIMIT) \|\| (roff > (RGN_MAP_LIMIT - len)))
	140	return -EINVAL;
	141	return 0;
	142	}
	143
1da177e4 LT	144	/*
	145	* mmap2() is like mmap() except that the offset is expressed in units
	146	* of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces
	147	* of) files that are larger than the address space of the CPU.
	148	*/
	149	asmlinkage unsigned long
	150	sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
	151	{
f8b72560	152	addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
1da177e4 LT	153	if (!IS_ERR((void *) addr))
	154	force_successful_syscall_return();
	155	return addr;
	156	}
	157
	158	asmlinkage unsigned long
	159	sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
	160	{
	161	if (offset_in_page(off) != 0)
	162	return -EINVAL;
	163
f8b72560	164	addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
1da177e4 LT	165	if (!IS_ERR((void *) addr))
	166	force_successful_syscall_return();
	167	return addr;
	168	}
	169
	170	asmlinkage unsigned long
	171	ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
	172	unsigned long new_addr)
	173	{
	174	extern unsigned long do_mremap (unsigned long addr,
	175	unsigned long old_len,
	176	unsigned long new_len,
	177	unsigned long flags,
	178	unsigned long new_addr);
	179
	180	down_write(&current->mm->mmap_sem);
	181	{
	182	addr = do_mremap(addr, old_len, new_len, flags, new_addr);
	183	}
	184	up_write(&current->mm->mmap_sem);
	185
	186	if (IS_ERR((void *) addr))
	187	return addr;
	188
	189	force_successful_syscall_return();
	190	return addr;
	191	}
	192
	193	#ifndef CONFIG_PCI
	194
	195	asmlinkage long
	196	sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
	197	void *buf)
	198	{
	199	return -ENOSYS;
	200	}
	201
	202	asmlinkage long
	203	sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
	204	void *buf)
	205	{
	206	return -ENOSYS;
	207	}
	208
	209	#endif /* CONFIG_PCI */