1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * (C) Copyright 2008 4 * Graeme Russ, graeme.russ@gmail.com. 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <fdtdec.h> 11 #include <asm/io.h> 12 #include <asm/msr.h> 13 #include <asm/mtrr.h> 14 #include <asm/arch/sysinfo.h> 15 #include <asm/arch/timestamp.h> 16 17 DECLARE_GLOBAL_DATA_PTR; 18 19 int arch_cpu_init(void) 20 { 21 int ret = get_coreboot_info(&lib_sysinfo); 22 if (ret != 0) { 23 printf("Failed to parse coreboot tables.\n"); 24 return ret; 25 } 26 27 timestamp_init(); 28 29 return x86_cpu_init_f(); 30 } 31 32 int checkcpu(void) 33 { 34 return 0; 35 } 36 37 int print_cpuinfo(void) 38 { 39 return default_print_cpuinfo(); 40 } 41 42 static void board_final_cleanup(void) 43 { 44 /* 45 * Un-cache the ROM so the kernel has one 46 * more MTRR available. 47 * 48 * Coreboot should have assigned this to the 49 * top available variable MTRR. 50 */ 51 u8 top_mtrr = (native_read_msr(MTRR_CAP_MSR) & 0xff) - 1; 52 u8 top_type = native_read_msr(MTRR_PHYS_BASE_MSR(top_mtrr)) & 0xff; 53 54 /* Make sure this MTRR is the correct Write-Protected type */ 55 if (top_type == MTRR_TYPE_WRPROT) { 56 struct mtrr_state state; 57 58 mtrr_open(&state); 59 wrmsrl(MTRR_PHYS_BASE_MSR(top_mtrr), 0); 60 wrmsrl(MTRR_PHYS_MASK_MSR(top_mtrr), 0); 61 mtrr_close(&state); 62 } 63 64 if (!fdtdec_get_config_bool(gd->fdt_blob, "u-boot,no-apm-finalize")) { 65 /* 66 * Issue SMI to coreboot to lock down ME and registers 67 * when allowed via device tree 68 */ 69 printf("Finalizing coreboot\n"); 70 outb(0xcb, 0xb2); 71 } 72 } 73 74 int last_stage_init(void) 75 { 76 if (gd->flags & GD_FLG_COLD_BOOT) 77 timestamp_add_to_bootstage(); 78 79 board_final_cleanup(); 80 81 return 0; 82 } 83 84 int misc_init_r(void) 85 { 86 return 0; 87 } 88