From 61be3603f4b9f353e605d7b7c8d0d9f3b90f5636 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ky=C3=B6sti=20M=C3=A4lkki?= Date: Sat, 15 Apr 2017 20:07:53 +0300 Subject: AGESA: Fix UMA calculations MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Vendorcode decides already in AMD_INIT_POST the exact location of UMA memory. To meet alignment requirements, it will extend uma_memory_size. We cannot calculate base from size and TOP_MEM1, but need to calculate size from base and TOP_MEM1 instead. Also allows selection of UmaMode==UMA_SPECIFIED to manually set amount of memory reserved for framebuffer. Change-Id: I2514c70a331c7fbf0056f22bf64f19c9374754c0 Signed-off-by: Kyösti Mälkki Reviewed-on: https://review.coreboot.org/19328 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin Reviewed-by: Marshall Dawson --- src/southbridge/amd/cimx/sb900/ramtop.c | 43 +++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 src/southbridge/amd/cimx/sb900/ramtop.c (limited to 'src/southbridge/amd/cimx/sb900/ramtop.c') diff --git a/src/southbridge/amd/cimx/sb900/ramtop.c b/src/southbridge/amd/cimx/sb900/ramtop.c new file mode 100644 index 0000000000..34e8364379 --- /dev/null +++ b/src/southbridge/amd/cimx/sb900/ramtop.c @@ -0,0 +1,43 @@ +/* + * 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 +#include +#include +#include + +void backup_top_of_ram(uint64_t ramtop) +{ + u32 dword = 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++; + } +} + +unsigned long get_top_of_ram(void) +{ + u32 xdata = 0; + int xnvram_pos = 0xf8, xi; + 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; +} -- cgit v1.2.3