| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2010 Advanced Micro Devices, Inc. |
| * |
| * 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 <arch/io.h> |
| #include <arch/acpi.h> |
| #include <cbmem.h> |
| #include "SBPLATFORM.h" |
| |
| int acpi_get_sleep_type(void) |
| { |
| u16 tmp = inw(PM1_CNT_BLK_ADDRESS); |
| tmp = ((tmp & (7 << 10)) >> 10); |
| return (int)tmp; |
| } |
| |
| #if IS_ENABLED(CONFIG_LATE_CBMEM_INIT) |
| |
| #ifndef __PRE_RAM__ |
| void backup_top_of_ram(uint64_t ramtop) |
| { |
| u32 dword = (u32) ramtop; |
| int nvram_pos = 0xf8, i; /* temp */ |
| for (i = 0; i<4; i++) { |
| outb(nvram_pos, BIOSRAM_INDEX); |
| outb((dword >>(8 * i)) & 0xff , BIOSRAM_DATA); |
| nvram_pos++; |
| } |
| } |
| #endif |
| |
| unsigned long get_top_of_ram(void) |
| { |
| u32 xdata = 0; |
| int xnvram_pos = 0xf8, xi; |
| if (acpi_get_sleep_type() != 3) |
| return 0; |
| for (xi = 0; xi<4; xi++) { |
| outb(xnvram_pos, BIOSRAM_INDEX); |
| xdata &= ~(0xff << (xi * 8)); |
| xdata |= inb(BIOSRAM_DATA) << (xi *8); |
| xnvram_pos++; |
| } |
| return (unsigned long) xdata; |
| } |
| |
| #endif |