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 <cpu_func.h>
9 #include <event.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;
24 
25 	ret = IS_ENABLED(CONFIG_X86_64) ? x86_cpu_reinit_f() :
26 		x86_cpu_init_f();
27 	if (ret)
28 		return ret;
29 
30 	ret = get_coreboot_info(&lib_sysinfo);
31 	if (ret != 0) {
32 		printf("Failed to parse coreboot tables.\n");
33 		return ret;
34 	}
35 
36 	timestamp_init();
37 
38 	return 0;
39 }
40 
board_final_init(void)41 static void board_final_init(void)
42 {
43 	/*
44 	 * Un-cache the ROM so the kernel has one
45 	 * more MTRR available.
46 	 *
47 	 * Coreboot should have assigned this to the
48 	 * top available variable MTRR.
49 	 */
50 	u8 top_mtrr = (native_read_msr(MTRR_CAP_MSR) & 0xff) - 1;
51 	u8 top_type = native_read_msr(MTRR_PHYS_BASE_MSR(top_mtrr)) & 0xff;
52 
53 	/* Make sure this MTRR is the correct Write-Protected type */
54 	if (top_type == MTRR_TYPE_WRPROT) {
55 		struct mtrr_state state;
56 
57 		mtrr_open(&state, true);
58 		wrmsrl(MTRR_PHYS_BASE_MSR(top_mtrr), 0);
59 		wrmsrl(MTRR_PHYS_MASK_MSR(top_mtrr), 0);
60 		mtrr_close(&state, true);
61 	}
62 
63 	if (!ofnode_conf_read_bool("u-boot,no-apm-finalize")) {
64 		/*
65 		 * Issue SMI to coreboot to lock down ME and registers
66 		 * when allowed via device tree
67 		 */
68 		printf("Finalizing coreboot\n");
69 		outb(0xcb, 0xb2);
70 	}
71 }
72 
last_stage_init(void)73 static int last_stage_init(void)
74 {
75 	timestamp_add_to_bootstage();
76 
77 	if (IS_ENABLED(CONFIG_XPL_BUILD))
78 		return 0;
79 
80 	board_final_init();
81 
82 	return 0;
83 }
84 EVENT_SPY_SIMPLE(EVT_LAST_STAGE_INIT, last_stage_init);
85