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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a90f590a1b
Using this helper allows us to avoid the in-kernel calls to the sys_mmap_pgoff() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_mmap_pgoff(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/sh/kernel/sys_sh.c
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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/SuperH
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* platform.
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*
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* Taken from i386 version.
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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/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.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/utsname.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/ipc.h>
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#include <asm/syscalls.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/cacheflush.h>
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#include <asm/cachectl.h>
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asmlinkage int old_mmap(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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int fd, unsigned long off)
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{
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if (off & ~PAGE_MASK)
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return -EINVAL;
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return ksys_mmap_pgoff(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
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}
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asmlinkage long sys_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 pgoff)
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{
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/*
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* The shift for mmap2 is constant, regardless of PAGE_SIZE
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* setting.
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*/
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if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
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return -EINVAL;
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pgoff >>= PAGE_SHIFT - 12;
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return ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
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}
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/* sys_cacheflush -- flush (part of) the processor cache. */
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asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, int op)
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{
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struct vm_area_struct *vma;
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if ((op <= 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I)))
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return -EINVAL;
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/*
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* Verify that the specified address region actually belongs
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* to this process.
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*/
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if (addr + len < addr)
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return -EFAULT;
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down_read(¤t->mm->mmap_sem);
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vma = find_vma (current->mm, addr);
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if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
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up_read(¤t->mm->mmap_sem);
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return -EFAULT;
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}
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switch (op & CACHEFLUSH_D_PURGE) {
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case CACHEFLUSH_D_INVAL:
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__flush_invalidate_region((void *)addr, len);
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break;
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case CACHEFLUSH_D_WB:
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__flush_wback_region((void *)addr, len);
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break;
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case CACHEFLUSH_D_PURGE:
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__flush_purge_region((void *)addr, len);
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break;
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}
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if (op & CACHEFLUSH_I)
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flush_icache_range(addr, addr+len);
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up_read(¤t->mm->mmap_sem);
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return 0;
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}
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