arch/x86/cpu/lapic.c

   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 }