1 files changed, 77 insertions, 0 deletions
diff --git a/roms/u-boot/arch/x86/cpu/qemu/dram.c b/roms/u-boot/arch/x86/cpu/qemu/dram.c
new file mode 100644
index 000000000..c17455012
--- /dev/null
+++ b/roms/u-boot/arch/x86/cpu/qemu/dram.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ */
+
+#include <common.h>
+#include <init.h>
+#include <asm/global_data.h>
+#include <asm/post.h>
+#include <asm/arch/qemu.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+u32 qemu_get_low_memory_size(void)
+{
+	u32 ram;
+
+	outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT);
+	ram = ((u32)inb(CMOS_DATA_PORT)) << 14;
+	outb(LOW_RAM_ADDR, CMOS_ADDR_PORT);
+	ram |= ((u32)inb(CMOS_DATA_PORT)) << 6;
+	ram += 16 * 1024;
+
+	return ram * 1024;
+}
+
+u64 qemu_get_high_memory_size(void)
+{
+	u64 ram;
+
+	outb(HIGH_HIGHRAM_ADDR, CMOS_ADDR_PORT);
+	ram = ((u64)inb(CMOS_DATA_PORT)) << 22;
+	outb(MID_HIGHRAM_ADDR, CMOS_ADDR_PORT);
+	ram |= ((u64)inb(CMOS_DATA_PORT)) << 14;
+	outb(LOW_HIGHRAM_ADDR, CMOS_ADDR_PORT);
+	ram |= ((u64)inb(CMOS_DATA_PORT)) << 6;
+
+	return ram * 1024;
+}
+
+int dram_init(void)
+{
+	gd->ram_size = qemu_get_low_memory_size();
+	gd->ram_size += qemu_get_high_memory_size();
+	post_code(POST_DRAM);
+
+	return 0;
+}
+
+int dram_init_banksize(void)
+{
+	u64 high_mem_size;
+
+	gd->bd->bi_dram[0].start = 0;
+	gd->bd->bi_dram[0].size = qemu_get_low_memory_size();
+
+	high_mem_size = qemu_get_high_memory_size();
+	if (high_mem_size) {
+		gd->bd->bi_dram[1].start = SZ_4G;
+		gd->bd->bi_dram[1].size = high_mem_size;
+	}
+
+	return 0;
+}
+
+/*
+ * This function looks for the highest region of memory lower than 4GB which
+ * has enough space for U-Boot where U-Boot is aligned on a page boundary.
+ * It overrides the default implementation found elsewhere which simply
+ * picks the end of ram, wherever that may be. The location of the stack,
+ * the relocation address, and how far U-Boot is moved by relocation are
+ * set in the global data structure.
+ */
+ulong board_get_usable_ram_top(ulong total_size)
+{
+	return qemu_get_low_memory_size();
+}