1/*
2 * contains various random system calls that have a non-standard
3 * calling sequence on the Linux/Blackfin platform.
4 *
5 * Copyright 2004-2009 Analog Devices Inc.
6 *
7 * Licensed under the GPL-2 or later
8 */
9
10#include <linux/spinlock.h>
11#include <linux/sem.h>
12#include <linux/msg.h>
13#include <linux/shm.h>
14#include <linux/syscalls.h>
15#include <linux/mman.h>
16#include <linux/file.h>
17#include <linux/fs.h>
18#include <linux/uaccess.h>
19#include <linux/ipc.h>
20#include <linux/unistd.h>
21
22#include <asm/cacheflush.h>
23#include <asm/dma.h>
24#include <asm/cachectl.h>
25#include <asm/ptrace.h>
26
27asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
28{
29	return sram_alloc_with_lsl(size, flags);
30}
31
32asmlinkage int sys_sram_free(const void *addr)
33{
34	return sram_free_with_lsl(addr);
35}
36
37asmlinkage void *sys_dma_memcpy(void *dest, const void *src, size_t len)
38{
39	return safe_dma_memcpy(dest, src, len);
40}
41
42#if defined(CONFIG_FB) || defined(CONFIG_FB_MODULE)
43#include <linux/fb.h>
44#include <linux/export.h>
45unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr,
46	unsigned long len, unsigned long pgoff, unsigned long flags)
47{
48	struct fb_info *info = filp->private_data;
49	return (unsigned long)info->screen_base;
50}
51EXPORT_SYMBOL(get_fb_unmapped_area);
52#endif
53
54/* Needed for legacy userspace atomic emulation */
55static DEFINE_SPINLOCK(bfin_spinlock_lock);
56
57#ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
58__attribute__((l1_text))
59#endif
60asmlinkage int sys_bfin_spinlock(int *p)
61{
62	int ret, tmp = 0;
63
64	spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
65	ret = get_user(tmp, p);
66	if (likely(ret == 0)) {
67		if (unlikely(tmp))
68			ret = 1;
69		else
70			put_user(1, p);
71	}
72	spin_unlock(&bfin_spinlock_lock);
73
74	return ret;
75}
76
77SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, len, int, op)
78{
79	if (is_user_addr_valid(current, addr, len) != 0)
80		return -EINVAL;
81
82	if (op & DCACHE)
83		blackfin_dcache_flush_range(addr, addr + len);
84	if (op & ICACHE)
85		blackfin_icache_flush_range(addr, addr + len);
86
87	return 0;
88}
89