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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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cd6f32aa08
We already had a syscall that did some dcache flushing, but it was not used in practice. Make it MIPS compatible instead so it can do both the DCACHE and ICACHE actions. We have code that wants to be able to use the ICACHE flush mode from userspace so this change enables that. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
126 lines
3.7 KiB
C
126 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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if (flags & DCACHE)
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homecache_evict(cpumask_of(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 trampolines to manage pt_regs where necessary. */
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#define sys_execve _sys_execve
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#define sys_sigaltstack _sys_sigaltstack
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#define sys_rt_sigreturn _sys_rt_sigreturn
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#define sys_clone _sys_clone
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#ifndef __tilegx__
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#define sys_cmpxchg_badaddr _sys_cmpxchg_badaddr
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#endif
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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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