| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2012 The Chromium OS Authors. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; version 2 of |
| * the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <stdint.h> |
| #include <string.h> |
| #include <arch/io.h> |
| #include <arch/ebda.h> |
| #include <arch/acpi.h> |
| |
| void setup_ebda(u32 low_memory_size, u16 ebda_segment, u16 ebda_size) |
| { |
| /* Skip in S3 resume path */ |
| if (acpi_is_wakeup_s3()) |
| return; |
| |
| if (!low_memory_size || !ebda_segment || !ebda_size) |
| return; |
| |
| /* clear BIOS DATA AREA */ |
| memset((void *)X86_BDA_BASE, 0, X86_BDA_SIZE); |
| |
| write16(X86_EBDA_LOWMEM, (low_memory_size >> 10)); |
| write16(X86_EBDA_SEGMENT, ebda_segment); |
| |
| /* Set up EBDA */ |
| memset((void *)((uintptr_t)ebda_segment << 4), 0, ebda_size); |
| write16((void*)((uintptr_t)ebda_segment << 4), (ebda_size >> 10)); |
| } |
| |
| void setup_default_ebda(void) |
| { |
| setup_ebda(DEFAULT_EBDA_LOWMEM, |
| DEFAULT_EBDA_SEGMENT, |
| DEFAULT_EBDA_SIZE); |
| } |