| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2012 secunet Security Networks AG |
| * Copyright (C) 2015 Damien Zammit <damien@zamaudio.com> |
| * |
| * 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. |
| */ |
| |
| #define __SIMPLE_DEVICE__ |
| |
| #include <cbmem.h> |
| #include <commonlib/helpers.h> |
| #include <stdint.h> |
| #include <arch/cpu.h> |
| #include <arch/io.h> |
| #include <device/pci_def.h> |
| #include <console/console.h> |
| #include <cpu/intel/romstage.h> |
| #include <cpu/x86/mtrr.h> |
| #include <northbridge/intel/x4x/x4x.h> |
| #include <program_loading.h> |
| |
| /** Decodes used Graphics Mode Select (GMS) to kilobytes. */ |
| u32 decode_igd_memory_size(const u32 gms) |
| { |
| static const u16 ggc2uma[] = { 0, 1, 4, 8, 16, |
| 32, 48, 64, 128, 256, 96, 160, 224, 352 }; |
| |
| if (gms > ARRAY_SIZE(ggc2uma)) |
| die("Bad Graphics Mode Select (GMS) setting.\n"); |
| |
| return ggc2uma[gms] << 10; |
| } |
| |
| /** Decodes used GTT Graphics Memory Size (GGMS) to kilobytes. */ |
| u32 decode_igd_gtt_size(const u32 gsm) |
| { |
| static const u8 ggc2gtt[] = { 0, 1, 0, 2, 0, 0, 0, 0, 0, 2, 3, 4}; |
| |
| if (gsm > ARRAY_SIZE(ggc2gtt)) |
| die("Bad GTT Graphics Memory Size (GGMS) setting.\n"); |
| |
| return ggc2gtt[gsm] << 10; |
| } |
| |
| u8 decode_pciebar(u32 *const base, u32 *const len) |
| { |
| *base = 0; |
| *len = 0; |
| const pci_devfn_t dev = PCI_DEV(0, 0, 0); |
| u32 pciexbar = 0; |
| u32 pciexbar_reg; |
| u32 reg32; |
| int max_buses; |
| const struct { |
| u16 num_buses; |
| u32 addr_mask; |
| } busmask[] = { |
| {256, 0xf0000000}, |
| {128, 0xf8000000}, |
| {64, 0xfc000000}, |
| {0, 0}, |
| }; |
| |
| pciexbar_reg = pci_read_config32(dev, D0F0_PCIEXBAR_LO); |
| |
| if (!(pciexbar_reg & 1)) { |
| printk(BIOS_WARNING, "WARNING: MMCONF not set\n"); |
| return 0; |
| } |
| |
| reg32 = (pciexbar_reg >> 1) & 3; |
| pciexbar = pciexbar_reg & busmask[reg32].addr_mask; |
| max_buses = busmask[reg32].num_buses; |
| |
| if (!pciexbar) { |
| printk(BIOS_WARNING, "WARNING: pciexbar invalid\n"); |
| return 0; |
| } |
| |
| *base = pciexbar; |
| *len = max_buses << 20; |
| return 1; |
| } |
| |
| /* Depending of UMA and TSEG configuration, TSEG might start at any |
| * 1 MiB aligment. As this may cause very greedy MTRR setup, push |
| * CBMEM top downwards to 4 MiB boundary. |
| */ |
| void *cbmem_top(void) |
| { |
| uintptr_t top_of_ram = pci_read_config32(PCI_DEV(0, 0, 0), D0F0_TSEG); |
| top_of_ram = ALIGN_DOWN(top_of_ram, 4*MiB); |
| return (void *) top_of_ram; |
| } |
| |
| #define ROMSTAGE_RAM_STACK_SIZE 0x5000 |
| |
| /* setup_stack_and_mtrrs() determines the stack to use after |
| * cache-as-ram is torn down as well as the MTRR settings to use. */ |
| void *setup_stack_and_mtrrs(void) |
| { |
| struct postcar_frame pcf; |
| uintptr_t top_of_ram; |
| |
| if (postcar_frame_init(&pcf, ROMSTAGE_RAM_STACK_SIZE)) |
| die("Unable to initialize postcar frame.\n"); |
| |
| /* Cache the ROM as WP just below 4GiB. */ |
| postcar_frame_add_mtrr(&pcf, -CACHE_ROM_SIZE, CACHE_ROM_SIZE, |
| MTRR_TYPE_WRPROT); |
| |
| /* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */ |
| postcar_frame_add_mtrr(&pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK); |
| |
| /* Cache two separate 4 MiB regions below the top of ram, this |
| * satisfies MTRR alignment requirements. If you modify this to |
| * cover TSEG, make sure UMA region is not set with WRBACK as it |
| * causes hard-to-recover boot failures. |
| */ |
| top_of_ram = (uintptr_t)cbmem_top(); |
| postcar_frame_add_mtrr(&pcf, top_of_ram - 4*MiB, 4*MiB, MTRR_TYPE_WRBACK); |
| postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 4*MiB, MTRR_TYPE_WRBACK); |
| |
| /* Save the number of MTRRs to setup. Return the stack location |
| * pointing to the number of MTRRs. |
| */ |
| return postcar_commit_mtrrs(&pcf); |
| } |