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@@ -0,0 +1,101 @@
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+/*
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+ * ARM64 Specific Low-Level ACPI Boot Support
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+ *
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+ * Copyright (C) 2013-2014, Linaro Ltd.
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+ * Author: Al Stone <al.stone@linaro.org>
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+ * Author: Graeme Gregory <graeme.gregory@linaro.org>
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+ * Author: Hanjun Guo <hanjun.guo@linaro.org>
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+ * Author: Tomasz Nowicki <tomasz.nowicki@linaro.org>
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+ * Author: Naresh Bhat <naresh.bhat@linaro.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#define pr_fmt(fmt) "ACPI: " fmt
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+
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+#include <linux/acpi.h>
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+#include <linux/bootmem.h>
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+#include <linux/cpumask.h>
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+#include <linux/init.h>
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+#include <linux/irq.h>
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+#include <linux/irqdomain.h>
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+#include <linux/memblock.h>
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+#include <linux/smp.h>
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+
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+int acpi_noirq; /* skip ACPI IRQ initialization */
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+int acpi_disabled;
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+EXPORT_SYMBOL(acpi_disabled);
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+
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+int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
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+EXPORT_SYMBOL(acpi_pci_disabled);
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+
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+/*
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+ * __acpi_map_table() will be called before page_init(), so early_ioremap()
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+ * or early_memremap() should be called here to for ACPI table mapping.
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+ */
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+char *__init __acpi_map_table(unsigned long phys, unsigned long size)
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+{
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+ if (!size)
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+ return NULL;
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+
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+ return early_memremap(phys, size);
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+}
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+
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+void __init __acpi_unmap_table(char *map, unsigned long size)
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+{
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+ if (!map || !size)
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+ return;
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+
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+ early_memunmap(map, size);
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+}
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+
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+static int __init acpi_parse_fadt(struct acpi_table_header *table)
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+{
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+ struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table;
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+
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+ /*
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+ * Revision in table header is the FADT Major revision, and there
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+ * is a minor revision of FADT which was introduced by ACPI 5.1,
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+ * we only deal with ACPI 5.1 or newer revision to get GIC and SMP
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+ * boot protocol configuration data, or we will disable ACPI.
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+ */
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+ if (table->revision > 5 ||
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+ (table->revision == 5 && fadt->minor_revision >= 1))
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+ return 0;
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+
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+ pr_warn("Unsupported FADT revision %d.%d, should be 5.1+, will disable ACPI\n",
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+ table->revision, fadt->minor_revision);
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+ disable_acpi();
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+
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+ return -EINVAL;
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+}
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+
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+/*
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+ * acpi_boot_table_init() called from setup_arch(), always.
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+ * 1. find RSDP and get its address, and then find XSDT
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+ * 2. extract all tables and checksums them all
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+ * 3. check ACPI FADT revision
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+ *
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+ * We can parse ACPI boot-time tables such as MADT after
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+ * this function is called.
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+ */
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+void __init acpi_boot_table_init(void)
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+{
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+ /* If acpi_disabled, bail out */
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+ if (acpi_disabled)
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+ return;
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+
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+ /* Initialize the ACPI boot-time table parser. */
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+ if (acpi_table_init()) {
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+ disable_acpi();
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+ return;
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+ }
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+
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+ if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt)) {
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+ /* disable ACPI if no FADT is found */
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+ disable_acpi();
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+ pr_err("Can't find FADT\n");
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+ }
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+}
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Al Stone