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-rw-r--r--arch/x86/cpu/lapic.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/x86/cpu/lapic.c b/arch/x86/cpu/lapic.c
new file mode 100644
index 0000000..4690603
--- /dev/null
+++ b/arch/x86/cpu/lapic.c
@@ -0,0 +1,57 @@
+/*
+ * From coreboot file of same name
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ * Copyright (C) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <asm/msr.h>
+#include <asm/io.h>
+#include <asm/lapic.h>
+#include <asm/post.h>
+
+void lapic_setup(void)
+{
+#if NEED_LAPIC == 1
+ /* Only Pentium Pro and later have those MSR stuff */
+ debug("Setting up local apic: ");
+
+ /* Enable the local apic */
+ enable_lapic();
+
+ /*
+ * Set Task Priority to 'accept all'.
+ */
+ lapic_write_around(LAPIC_TASKPRI,
+ lapic_read_around(LAPIC_TASKPRI) & ~LAPIC_TPRI_MASK);
+
+ /* Put the local apic in virtual wire mode */
+ lapic_write_around(LAPIC_SPIV, (lapic_read_around(LAPIC_SPIV) &
+ ~(LAPIC_VECTOR_MASK)) | LAPIC_SPIV_ENABLE);
+ lapic_write_around(LAPIC_LVT0, (lapic_read_around(LAPIC_LVT0) &
+ ~(LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER |
+ LAPIC_LVT_REMOTE_IRR | LAPIC_INPUT_POLARITY |
+ LAPIC_SEND_PENDING | LAPIC_LVT_RESERVED_1 |
+ LAPIC_DELIVERY_MODE_MASK)) |
+ (LAPIC_LVT_REMOTE_IRR | LAPIC_SEND_PENDING |
+ LAPIC_DELIVERY_MODE_EXTINT));
+ lapic_write_around(LAPIC_LVT1, (lapic_read_around(LAPIC_LVT1) &
+ ~(LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER |
+ LAPIC_LVT_REMOTE_IRR | LAPIC_INPUT_POLARITY |
+ LAPIC_SEND_PENDING | LAPIC_LVT_RESERVED_1 |
+ LAPIC_DELIVERY_MODE_MASK)) |
+ (LAPIC_LVT_REMOTE_IRR | LAPIC_SEND_PENDING |
+ LAPIC_DELIVERY_MODE_NMI));
+
+ debug("apic_id: 0x%02lx, ", lapicid());
+#else /* !NEED_LLAPIC */
+ /* Only Pentium Pro and later have those MSR stuff */
+ debug("Disabling local apic: ");
+ disable_lapic();
+#endif /* !NEED_LAPIC */
+ debug("done.\n");
+ post_code(POST_LAPIC);
+}