sys_sh.c

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/*
 * linux/arch/sh/kernel/sys_sh.c
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/SuperH
 * platform.
 *
 * Taken from i386 version.
 */
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/ipc.h>
#include <asm/syscalls.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include <asm/cacheflush.h>
#include <asm/cachectl.h>

asmlinkage int old_mmap(unsigned long addr, unsigned long len,
    unsigned long prot, unsigned long flags,
    int fd, unsigned long off)
{
    if (off & ~PAGE_MASK)
        return -EINVAL;
    return sys_mmap_pgoff(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
}

asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
    unsigned long prot, unsigned long flags,
    unsigned long fd, unsigned long pgoff)
{
    /*
     * The shift for mmap2 is constant, regardless of PAGE_SIZE
     * setting.
     */
    if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
        return -EINVAL;

    pgoff >>= PAGE_SHIFT - 12;

    return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
}

/* sys_cacheflush -- flush (part of) the processor cache.  */
asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, int op)
{
    struct vm_area_struct *vma;

    if ((op <= 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I)))
        return -EINVAL;

    /*
     * Verify that the specified address region actually belongs
     * to this process.
     */
    if (addr + len < addr)
        return -EFAULT;

    down_read(&current->mm->mmap_sem);
    vma = find_vma (current->mm, addr);
    if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
        up_read(&current->mm->mmap_sem);
        return -EFAULT;
    }

    switch (op & CACHEFLUSH_D_PURGE) {
        case CACHEFLUSH_D_INVAL:
            __flush_invalidate_region((void *)addr, len);
            break;
        case CACHEFLUSH_D_WB:
            __flush_wback_region((void *)addr, len);
            break;
        case CACHEFLUSH_D_PURGE:
            __flush_purge_region((void *)addr, len);
            break;
    }

    if (op & CACHEFLUSH_I)
        flush_icache_range(addr, addr+len);

    up_read(&current->mm->mmap_sem);
    return 0;
}