arch/um/kernel/tt/mem.c

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/stddef.h"
   7 #include "linux/config.h"
   8 #include "linux/mm.h"
   9 #include "asm/uaccess.h"
  10 #include "mem_user.h"
  11 #include "kern_util.h"
  12 #include "user_util.h"
  13 #include "kern.h"
  14 #include "tt.h"
  15
  16 void before_mem_tt(unsigned long brk_start)
  17 {
  18         if(!jail || debug)
  19                 remap_data(UML_ROUND_DOWN(&_stext), UML_ROUND_UP(&_etext), 1);
  20         remap_data(UML_ROUND_DOWN(&_sdata), UML_ROUND_UP(&_edata), 1);
  21         remap_data(UML_ROUND_DOWN(&__bss_start), UML_ROUND_UP(&_end), 1);
  22 }
  23
  24 #ifdef CONFIG_HOST_2G_2G
  25 #define TOP 0x80000000
  26 #else
  27 #define TOP 0xc0000000
  28 #endif
  29
  30 #define SIZE ((CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS) * 0x20000000)
  31 #define START (TOP - SIZE)
  32
  33 unsigned long set_task_sizes_tt(int arg, unsigned long *host_size_out,
  34                                 unsigned long *task_size_out)
  35 {
  36         /* Round up to the nearest 4M */
  37         *host_size_out = ROUND_4M((unsigned long) &arg);
  38         *task_size_out = START;
  39         return(START);
  40 }
  41
  42 /*
  43  * Overrides for Emacs so that we follow Linus's tabbing style.
  44  * Emacs will notice this stuff at the end of the file and automatically
  45  * adjust the settings for this buffer only.  This must remain at the end
  46  * of the file.
  47  * ---------------------------------------------------------------------------
  48  * Local variables:
  49  * c-file-style: "linux"
  50  * End:
  51  */