arch/c6x/kernel/sys_c6x.c

   1 /*
   2  *  Port on Texas Instruments TMS320C6x architecture
   3  *
   4  *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
   5  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/syscalls.h>
  13 #include <linux/uaccess.h>
  14
  15 #include <asm/syscalls.h>
  16
  17 #ifdef CONFIG_ACCESS_CHECK
  18 int _access_ok(unsigned long addr, unsigned long size)
  19 {
  20         if (!size)
  21                 return 1;
  22
  23         if (!addr || addr > (0xffffffffUL - (size - 1)))
  24                 goto _bad_access;
  25
  26         if (segment_eq(get_fs(), KERNEL_DS))
  27                 return 1;
  28
  29         if (memory_start <= addr && (addr + size - 1) < memory_end)
  30                 return 1;
  31
  32 _bad_access:
  33         pr_debug("Bad access attempt: pid[%d] addr[%08lx] size[0x%lx]\n",
  34                  current->pid, addr, size);
  35         return 0;
  36 }
  37 EXPORT_SYMBOL(_access_ok);
  38 #endif
  39
  40 /* sys_cache_sync -- sync caches over given range */
  41 asmlinkage int sys_cache_sync(unsigned long s, unsigned long e)
  42 {
  43         L1D_cache_block_writeback_invalidate(s, e);
  44         L1P_cache_block_invalidate(s, e);
  45
  46         return 0;
  47 }
  48
  49 /* Provide the actual syscall number to call mapping. */
  50 #undef __SYSCALL
  51 #define __SYSCALL(nr, call) [nr] = (call),
  52
  53 /*
  54  * Use trampolines
  55  */
  56 #define sys_pread64             sys_pread_c6x
  57 #define sys_pwrite64            sys_pwrite_c6x
  58 #define sys_truncate64          sys_truncate64_c6x
  59 #define sys_ftruncate64         sys_ftruncate64_c6x
  60 #define sys_fadvise64           sys_fadvise64_c6x
  61 #define sys_fadvise64_64        sys_fadvise64_64_c6x
  62 #define sys_fallocate           sys_fallocate_c6x
  63
  64 /* Use sys_mmap_pgoff directly */
  65 #define sys_mmap2 sys_mmap_pgoff
  66
  67 /*
  68  * Note that we can't include <linux/unistd.h> here since the header
  69  * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
  70  */
  71 void *sys_call_table[__NR_syscalls] = {
  72         [0 ... __NR_syscalls-1] = sys_ni_syscall,
  73 #include <asm/unistd.h>
  74 };