1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2011 The Chromium OS Authors.
4  * (C) Copyright 2008
5  * Graeme Russ, graeme.russ@gmail.com.
6  */
7 
8 #include <common.h>
9 #include <cpu_func.h>
10 #include <fdtdec.h>
11 #include <init.h>
12 #include <usb.h>
13 #include <asm/global_data.h>
14 #include <asm/io.h>
15 #include <asm/msr.h>
16 #include <asm/mtrr.h>
17 #include <asm/cb_sysinfo.h>
18 #include <asm/arch/timestamp.h>
19 #include <dm/ofnode.h>
20 
arch_cpu_init(void)21 int arch_cpu_init(void)
22 {
23 	int ret = get_coreboot_info(&lib_sysinfo);
24 	if (ret != 0) {
25 		printf("Failed to parse coreboot tables.\n");
26 		return ret;
27 	}
28 
29 	timestamp_init();
30 
31 	return IS_ENABLED(CONFIG_X86_RUN_64BIT) ? x86_cpu_reinit_f() :
32 		 x86_cpu_init_f();
33 }
34 
checkcpu(void)35 int checkcpu(void)
36 {
37 	return 0;
38 }
39 
print_cpuinfo(void)40 int print_cpuinfo(void)
41 {
42 	return default_print_cpuinfo();
43 }
44 
board_final_init(void)45 static void board_final_init(void)
46 {
47 	/*
48 	 * Un-cache the ROM so the kernel has one
49 	 * more MTRR available.
50 	 *
51 	 * Coreboot should have assigned this to the
52 	 * top available variable MTRR.
53 	 */
54 	u8 top_mtrr = (native_read_msr(MTRR_CAP_MSR) & 0xff) - 1;
55 	u8 top_type = native_read_msr(MTRR_PHYS_BASE_MSR(top_mtrr)) & 0xff;
56 
57 	/* Make sure this MTRR is the correct Write-Protected type */
58 	if (top_type == MTRR_TYPE_WRPROT) {
59 		struct mtrr_state state;
60 
61 		mtrr_open(&state, true);
62 		wrmsrl(MTRR_PHYS_BASE_MSR(top_mtrr), 0);
63 		wrmsrl(MTRR_PHYS_MASK_MSR(top_mtrr), 0);
64 		mtrr_close(&state, true);
65 	}
66 
67 	if (!ofnode_conf_read_bool("u-boot,no-apm-finalize")) {
68 		/*
69 		 * Issue SMI to coreboot to lock down ME and registers
70 		 * when allowed via device tree
71 		 */
72 		printf("Finalizing coreboot\n");
73 		outb(0xcb, 0xb2);
74 	}
75 }
76 
last_stage_init(void)77 int last_stage_init(void)
78 {
79 	/* start usb so that usb keyboard can be used as input device */
80 	if (CONFIG_IS_ENABLED(USB_KEYBOARD))
81 		usb_init();
82 
83 	board_final_init();
84 
85 	return 0;
86 }
87