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/arch/sysinfo.h>
18 #include <asm/arch/timestamp.h>
19 
20 DECLARE_GLOBAL_DATA_PTR;
21 
arch_cpu_init(void)22 int arch_cpu_init(void)
23 {
24 	int ret = get_coreboot_info(&lib_sysinfo);
25 	if (ret != 0) {
26 		printf("Failed to parse coreboot tables.\n");
27 		return ret;
28 	}
29 
30 	timestamp_init();
31 
32 	return IS_ENABLED(CONFIG_X86_RUN_64BIT) ? x86_cpu_reinit_f() :
33 		 x86_cpu_init_f();
34 }
35 
checkcpu(void)36 int checkcpu(void)
37 {
38 	return 0;
39 }
40 
print_cpuinfo(void)41 int print_cpuinfo(void)
42 {
43 	return default_print_cpuinfo();
44 }
45 
board_final_init(void)46 static void board_final_init(void)
47 {
48 	/*
49 	 * Un-cache the ROM so the kernel has one
50 	 * more MTRR available.
51 	 *
52 	 * Coreboot should have assigned this to the
53 	 * top available variable MTRR.
54 	 */
55 	u8 top_mtrr = (native_read_msr(MTRR_CAP_MSR) & 0xff) - 1;
56 	u8 top_type = native_read_msr(MTRR_PHYS_BASE_MSR(top_mtrr)) & 0xff;
57 
58 	/* Make sure this MTRR is the correct Write-Protected type */
59 	if (top_type == MTRR_TYPE_WRPROT) {
60 		struct mtrr_state state;
61 
62 		mtrr_open(&state, true);
63 		wrmsrl(MTRR_PHYS_BASE_MSR(top_mtrr), 0);
64 		wrmsrl(MTRR_PHYS_MASK_MSR(top_mtrr), 0);
65 		mtrr_close(&state, true);
66 	}
67 
68 	if (!fdtdec_get_config_bool(gd->fdt_blob, "u-boot,no-apm-finalize")) {
69 		/*
70 		 * Issue SMI to coreboot to lock down ME and registers
71 		 * when allowed via device tree
72 		 */
73 		printf("Finalizing coreboot\n");
74 		outb(0xcb, 0xb2);
75 	}
76 }
77 
last_stage_init(void)78 int last_stage_init(void)
79 {
80 	/* start usb so that usb keyboard can be used as input device */
81 	if (CONFIG_IS_ENABLED(USB_KEYBOARD))
82 		usb_init();
83 
84 	board_final_init();
85 
86 	return 0;
87 }
88