LXR uboot/arch/x86/cpu/qemu/dram.c

   1/*
   2 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
   3 *
   4 * SPDX-License-Identifier:     GPL-2.0+
   5 */
   6
   7#include <common.h>
   8#include <asm/post.h>
   9#include <asm/arch/qemu.h>
  10
  11DECLARE_GLOBAL_DATA_PTR;
  12
  13int dram_init(void)
  14{
  15        u32 ram;
  16
  17        outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT);
  18        ram = ((u32)inb(CMOS_DATA_PORT)) << 14;
  19        outb(LOW_RAM_ADDR, CMOS_ADDR_PORT);
  20        ram |= ((u32)inb(CMOS_DATA_PORT)) << 6;
  21        ram += 16 * 1024;
  22
  23        gd->ram_size = ram * 1024;
  24        post_code(POST_DRAM);
  25
  26        return 0;
  27}
  28
  29int dram_init_banksize(void)
  30{
  31        gd->bd->bi_dram[0].start = 0;
  32        gd->bd->bi_dram[0].size = gd->ram_size;
  33
  34        return 0;
  35}
  36
  37/*
  38 * This function looks for the highest region of memory lower than 4GB which
  39 * has enough space for U-Boot where U-Boot is aligned on a page boundary.
  40 * It overrides the default implementation found elsewhere which simply
  41 * picks the end of ram, wherever that may be. The location of the stack,
  42 * the relocation address, and how far U-Boot is moved by relocation are
  43 * set in the global data structure.
  44 */
  45ulong board_get_usable_ram_top(ulong total_size)
  46{
  47        return gd->ram_size;
  48}
  49