mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
768557ca5b
Now that hpsim support is gone, CONFIG_PCI is forced on for ia64, and we can remove a few ifdefs for it. Acked-by: Tom Vaden <tom.vaden@hpe.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lkml.kernel.org/r/20190813072514.23299-19-hch@lst.de Signed-off-by: Tony Luck <tony.luck@intel.com>
169 lines
4.2 KiB
C
169 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* 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 = ksys_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 = ksys_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;
|
|
}
|