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| author | Simon Glass <sjg@chromium.org> | 2014-11-24 21:18:15 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2014-11-25 06:34:11 -0700 |
| commit | 0c9075e9ad21caa43c524288d7def9e8b081fa11 (patch) | |
| tree | 6a5dfa7abd5ac5747acbc34f659371116e2d8ef2 /arch/x86/cpu/lapic.c | |
| parent | b636dd1079fcdd55a38412afacb2be91a82cce1e (diff) | |
| download | u-boot-0c9075e9ad21caa43c524288d7def9e8b081fa11.tar.gz | |
x86: Add LAPIC setup code
Add code to set up the Local Advanced Peripheral Interrupt Controller.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'arch/x86/cpu/lapic.c')
| -rw-r--r-- | arch/x86/cpu/lapic.c | 57 |
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 0000000000..4690603c75 --- /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); +} |