xref: /openbmc/u-boot/arch/x86/cpu/lapic.c (revision 5d6050fd)
1 /*
2  * From coreboot file of same name
3  *
4  * Copyright (C) 2008-2009 coresystems GmbH
5  * Copyright (C) 2014 Google, Inc
6  *
7  * SPDX-License-Identifier:	GPL-2.0
8  */
9 
10 #include <common.h>
11 #include <asm/msr.h>
12 #include <asm/io.h>
13 #include <asm/lapic.h>
14 #include <asm/post.h>
15 
16 void lapic_setup(void)
17 {
18 #if NEED_LAPIC == 1
19 	/* Only Pentium Pro and later have those MSR stuff */
20 	debug("Setting up local apic: ");
21 
22 	/* Enable the local apic */
23 	enable_lapic();
24 
25 	/*
26 	 * Set Task Priority to 'accept all'.
27 	 */
28 	lapic_write_around(LAPIC_TASKPRI,
29 			   lapic_read_around(LAPIC_TASKPRI) & ~LAPIC_TPRI_MASK);
30 
31 	/* Put the local apic in virtual wire mode */
32 	lapic_write_around(LAPIC_SPIV, (lapic_read_around(LAPIC_SPIV) &
33 				~(LAPIC_VECTOR_MASK)) | LAPIC_SPIV_ENABLE);
34 	lapic_write_around(LAPIC_LVT0, (lapic_read_around(LAPIC_LVT0) &
35 			~(LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER |
36 			  LAPIC_LVT_REMOTE_IRR | LAPIC_INPUT_POLARITY |
37 			  LAPIC_SEND_PENDING | LAPIC_LVT_RESERVED_1 |
38 			  LAPIC_DELIVERY_MODE_MASK)) |
39 			(LAPIC_LVT_REMOTE_IRR | LAPIC_SEND_PENDING |
40 			 LAPIC_DELIVERY_MODE_EXTINT));
41 	lapic_write_around(LAPIC_LVT1, (lapic_read_around(LAPIC_LVT1) &
42 			~(LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER |
43 			  LAPIC_LVT_REMOTE_IRR | LAPIC_INPUT_POLARITY |
44 			  LAPIC_SEND_PENDING | LAPIC_LVT_RESERVED_1 |
45 			  LAPIC_DELIVERY_MODE_MASK)) |
46 		(LAPIC_LVT_REMOTE_IRR | LAPIC_SEND_PENDING |
47 			LAPIC_DELIVERY_MODE_NMI));
48 
49 	debug("apic_id: 0x%02lx, ", lapicid());
50 #else /* !NEED_LLAPIC */
51 	/* Only Pentium Pro and later have those MSR stuff */
52 	debug("Disabling local apic: ");
53 	disable_lapic();
54 #endif /* !NEED_LAPIC */
55 	debug("done.\n");
56 	post_code(POST_LAPIC);
57 }
58