arch/mips/loongson2ef/common/mem.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4 #include <linux/fs.h>
   5 #include <linux/fcntl.h>
   6 #include <linux/memblock.h>
   7 #include <linux/mm.h>
   8
   9 #include <asm/bootinfo.h>
  10
  11 #include <loongson.h>
  12 #include <mem.h>
  13 #include <pci.h>
  14
  15
  16 u32 memsize, highmemsize;
  17
  18 void __init prom_init_memory(void)
  19 {
  20         memblock_add(0x0, (memsize << 20));
  21
  22 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
  23         {
  24                 int bit;
  25
  26                 bit = fls(memsize + highmemsize);
  27                 if (bit != ffs(memsize + highmemsize))
  28                         bit += 20;
  29                 else
  30                         bit = bit + 20 - 1;
  31
  32                 /* set cpu window3 to map CPU to DDR: 2G -> 2G */
  33                 LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
  34                                           0x80000000ul, (1 << bit));
  35                 mmiowb();
  36         }
  37 #endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
  38
  39 #ifdef CONFIG_64BIT
  40         if (highmemsize > 0)
  41                 memblock_add(LOONGSON_HIGHMEM_START, highmemsize << 20);
  42 #endif /* !CONFIG_64BIT */
  43 }