arch/mips/hp-lj/utils.c

   1 /*
   2  *
   3  *
   4  *
   5  *
   6  */
   7 #include <linux/types.h>
   8 #include <linux/kernel.h>
   9 #include <linux/string.h>
  10 #include <linux/module.h>
  11 #include <asm/io.h>
  12 #include "utils.h"
  13
  14
  15 #define  miu_chan_cfg(x)      ((volatile unsigned long  *)(0xbff40000+x*4))       /* for andros */
  16
  17 int mbsize[8] = {1,2,4,8,16,32,64,128};
  18
  19 unsigned long get_mem_avail(void) {
  20
  21     unsigned long  cfg[10],i,total_mem=0;
  22
  23         for(i=0;i<10;i++)
  24                 cfg[i] = *miu_chan_cfg(i);
  25
  26         for(i=0;i<10;i++){
  27                 if(cfg[i]==0x1fc160c2) continue;                           // skip empties
  28                 if(   ( (cfg[i]>>12) & 0xf )   <=  0xb ) continue;         // skip roms
  29         total_mem += mbsize[(cfg[i]>>16)&0x7] *1024*1024;
  30         }
  31     return total_mem;
  32 }
  33
  34
  35
  36
  37 static ulong* buffer_ptr = NULL;
  38 static ulong buffer_size = 0;
  39
  40 ulong* get_reserved_buffer(void) {return KSEG0ADDR(buffer_ptr);}
  41 ulong* get_reserved_buffer_virtual(void) {return (ulong*)ReservedMemVirtualAddr;}
  42 ulong get_reserved_buffer_size(void) {return buffer_size;}
  43
  44 #define MIN_GEN_MEM (4 << 20)
  45
  46
  47 void  reserve_buffer(const char* cl, ulong base_mem)
  48 {
  49         char* pos = strstr(cl, "reserved_buffer=");
  50         if (pos) {
  51                 buffer_size = simple_strtol(pos+strlen("reserved_buffer="),
  52                                             0, 10);
  53                 buffer_size <<= 20;
  54                 if (buffer_size + MIN_GEN_MEM > base_mem)
  55                         buffer_size = base_mem - MIN_GEN_MEM;
  56                 if (buffer_size > 0)
  57                         buffer_ptr = (ulong*)(base_mem - buffer_size);
  58                 else
  59                         buffer_size = 0;
  60         }
  61 }
  62
  63
  64
  65 EXPORT_SYMBOL(get_reserved_buffer);
  66 EXPORT_SYMBOL(get_reserved_buffer_virtual);
  67 EXPORT_SYMBOL(get_reserved_buffer_size);
  68
  69