Linux Kernel  3.7.1
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sys_bfin.c
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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 
27 asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
28 {
29  return sram_alloc_with_lsl(size, flags);
30 }
31 
32 asmlinkage int sys_sram_free(const void *addr)
33 {
34  return sram_free_with_lsl(addr);
35 }
36 
37 asmlinkage 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>
45 unsigned 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 }
52 #endif
53 
54 /* Needed for legacy userspace atomic emulation */
55 static DEFINE_SPINLOCK(bfin_spinlock_lock);
56 
57 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
58 __attribute__((l1_text))
59 #endif
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 
77 SYSCALL_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)
84  if (op & ICACHE)
86 
87  return 0;
88 }