bc1a298f4e
This change adds support for CONFIG_PREEMPT (full kernel preemption). In addition to the core support, this change includes a number of places where we fix up uses of smp_processor_id() and per-cpu variables. I also eliminate the PAGE_HOME_HERE and PAGE_HOME_UNKNOWN values for page homing, as it turns out they weren't being used. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
123 lines
3.7 KiB
C
123 lines
3.7 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/TILE
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/file.h>
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#include <linux/mempolicy.h>
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#include <linux/binfmts.h>
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#include <linux/fs.h>
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#include <linux/compat.h>
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#include <linux/uaccess.h>
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#include <linux/signal.h>
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#include <asm/syscalls.h>
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#include <asm/pgtable.h>
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#include <asm/homecache.h>
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#include <asm/cachectl.h>
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#include <arch/chip.h>
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SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, len,
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unsigned long, flags)
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{
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/* DCACHE is not particularly effective if not bound to one cpu. */
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if (flags & DCACHE)
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homecache_evict(cpumask_of(raw_smp_processor_id()));
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if (flags & ICACHE)
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flush_remote(0, HV_FLUSH_EVICT_L1I, mm_cpumask(current->mm),
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0, 0, 0, NULL, NULL, 0);
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return 0;
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}
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/*
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* Syscalls that pass 64-bit values on 32-bit systems normally
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* pass them as (low,high) word packed into the immediately adjacent
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* registers. If the low word naturally falls on an even register,
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* our ABI makes it work correctly; if not, we adjust it here.
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* Handling it here means we don't have to fix uclibc AND glibc AND
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* any other standard libcs we want to support.
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*/
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#if !defined(__tilegx__) || defined(CONFIG_COMPAT)
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ssize_t sys32_readahead(int fd, u32 offset_lo, u32 offset_hi, u32 count)
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{
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return sys_readahead(fd, ((loff_t)offset_hi << 32) | offset_lo, count);
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}
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int sys32_fadvise64_64(int fd, u32 offset_lo, u32 offset_hi,
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u32 len_lo, u32 len_hi, int advice)
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{
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return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
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((loff_t)len_hi << 32) | len_lo, advice);
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}
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#endif /* 32-bit syscall wrappers */
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/* Note: used by the compat code even in 64-bit Linux. */
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SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
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unsigned long, prot, unsigned long, flags,
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unsigned long, fd, unsigned long, off_4k)
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{
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#define PAGE_ADJUST (PAGE_SHIFT - 12)
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if (off_4k & ((1 << PAGE_ADJUST) - 1))
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return -EINVAL;
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return sys_mmap_pgoff(addr, len, prot, flags, fd,
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off_4k >> PAGE_ADJUST);
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}
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#ifdef __tilegx__
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SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
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unsigned long, prot, unsigned long, flags,
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unsigned long, fd, off_t, offset)
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{
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if (offset & ((1 << PAGE_SHIFT) - 1))
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return -EINVAL;
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return sys_mmap_pgoff(addr, len, prot, flags, fd,
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offset >> PAGE_SHIFT);
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}
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#endif
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/* Provide the actual syscall number to call mapping. */
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#undef __SYSCALL
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#define __SYSCALL(nr, call) [nr] = (call),
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#ifndef __tilegx__
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/* See comments at the top of the file. */
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#define sys_fadvise64_64 sys32_fadvise64_64
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#define sys_readahead sys32_readahead
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#endif
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/* Call the assembly trampolines where necessary. */
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#undef sys_rt_sigreturn
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#define sys_rt_sigreturn _sys_rt_sigreturn
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#define sys_clone _sys_clone
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/*
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* Note that we can't include <linux/unistd.h> here since the header
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* guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
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*/
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void *sys_call_table[__NR_syscalls] = {
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[0 ... __NR_syscalls-1] = sys_ni_syscall,
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#include <asm/unistd.h>
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};
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