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790baef3b9
QEMU likes to have an MTRR set up, just like real machines. Add an MTRR which covers the total RAM size. This does nothing on machines without MTRRs. Signed-off-by: Simon Glass <sjg@chromium.org>
96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
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*/
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#include <init.h>
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#include <spl.h>
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#include <asm/global_data.h>
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#include <asm/mtrr.h>
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#include <asm/post.h>
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#include <asm/arch/qemu.h>
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#include <linux/sizes.h>
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DECLARE_GLOBAL_DATA_PTR;
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u32 qemu_get_low_memory_size(void)
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{
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u32 ram;
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outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT);
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ram = ((u32)inb(CMOS_DATA_PORT)) << 14;
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outb(LOW_RAM_ADDR, CMOS_ADDR_PORT);
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ram |= ((u32)inb(CMOS_DATA_PORT)) << 6;
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ram += 16 * 1024;
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return ram * 1024;
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}
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u64 qemu_get_high_memory_size(void)
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{
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u64 ram;
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outb(HIGH_HIGHRAM_ADDR, CMOS_ADDR_PORT);
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ram = ((u64)inb(CMOS_DATA_PORT)) << 22;
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outb(MID_HIGHRAM_ADDR, CMOS_ADDR_PORT);
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ram |= ((u64)inb(CMOS_DATA_PORT)) << 14;
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outb(LOW_HIGHRAM_ADDR, CMOS_ADDR_PORT);
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ram |= ((u64)inb(CMOS_DATA_PORT)) << 6;
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return ram * 1024;
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}
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int dram_init(void)
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{
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gd->ram_size = qemu_get_low_memory_size();
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gd->ram_size += qemu_get_high_memory_size();
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post_code(POST_DRAM);
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if (xpl_phase() == PHASE_BOARD_F) {
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u64 total = gd->ram_size;
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int ret;
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if (total > SZ_2G + SZ_1G)
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total += SZ_1G;
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ret = mtrr_add_request(MTRR_TYPE_WRBACK, 0, total);
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if (ret != -ENOSYS) {
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if (ret)
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return log_msg_ret("mta", ret);
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ret = mtrr_commit(false);
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if (ret)
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return log_msg_ret("mtc", ret);
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}
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}
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return 0;
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}
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int dram_init_banksize(void)
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{
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u64 high_mem_size;
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gd->bd->bi_dram[0].start = 0;
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gd->bd->bi_dram[0].size = qemu_get_low_memory_size();
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high_mem_size = qemu_get_high_memory_size();
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if (high_mem_size) {
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gd->bd->bi_dram[1].start = SZ_4G;
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gd->bd->bi_dram[1].size = high_mem_size;
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}
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return 0;
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}
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/*
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* This function looks for the highest region of memory lower than 4GB which
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* has enough space for U-Boot where U-Boot is aligned on a page boundary.
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* It overrides the default implementation found elsewhere which simply
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* picks the end of ram, wherever that may be. The location of the stack,
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* the relocation address, and how far U-Boot is moved by relocation are
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* set in the global data structure.
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*/
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phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
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{
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return qemu_get_low_memory_size();
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}
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