sys_bfin.c

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/*
 * contains various random system calls that have a non-standard
 * calling sequence on the Linux/Blackfin platform.
 *
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later
 */

#include <linux/spinlock.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/ipc.h>
#include <linux/unistd.h>

#include <asm/cacheflush.h>
#include <asm/dma.h>
#include <asm/cachectl.h>
#include <asm/ptrace.h>

asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
{
    return sram_alloc_with_lsl(size, flags);
}

asmlinkage int sys_sram_free(const void *addr)
{
    return sram_free_with_lsl(addr);
}

asmlinkage void *sys_dma_memcpy(void *dest, const void *src, size_t len)
{
    return safe_dma_memcpy(dest, src, len);
}

#if defined(CONFIG_FB) || defined(CONFIG_FB_MODULE)
#include <linux/fb.h>
#include <linux/export.h>
unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr,
    unsigned long len, unsigned long pgoff, unsigned long flags)
{
    struct fb_info *info = filp->private_data;
    return (unsigned long)info->screen_base;
}
EXPORT_SYMBOL(get_fb_unmapped_area);
#endif

/* Needed for legacy userspace atomic emulation */
static DEFINE_SPINLOCK(bfin_spinlock_lock);

#ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
__attribute__((l1_text))
#endif
asmlinkage int sys_bfin_spinlock(int *p)
{
    int ret, tmp = 0;

    spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
    ret = get_user(tmp, p);
    if (likely(ret == 0)) {
        if (unlikely(tmp))
            ret = 1;
        else
            put_user(1, p);
    }
    spin_unlock(&bfin_spinlock_lock);

    return ret;
}

SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, len, int, op)
{
    if (is_user_addr_valid(current, addr, len) != 0)
        return -EINVAL;

    if (op & DCACHE)
        blackfin_dcache_flush_range(addr, addr + len);
    if (op & ICACHE)
        blackfin_icache_flush_range(addr, addr + len);

    return 0;
}