[PATCH 2/7] arm64: ACPI: move kernel acpi files to a directory
al.stone at linaro.org
al.stone at linaro.org
Thu Jan 22 16:44:39 PST 2015
From: Al Stone <ahs3 at redhat.com>
In preparation for adding some additional arch-dependent ACPI files,
move the existing ones to a directory to try to keep clutter down in
the arch/arm64/kernel directory.
There is no functional change. This patch only moves source files.
Signed-off-by: Al Stone <al.stone at linaro.org>
---
arch/arm64/kernel/Makefile | 2 +-
arch/arm64/kernel/acpi.c | 359 ----------------------------------------
arch/arm64/kernel/acpi/Makefile | 1 +
arch/arm64/kernel/acpi/acpi.c | 359 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 361 insertions(+), 360 deletions(-)
delete mode 100644 arch/arm64/kernel/acpi.c
create mode 100644 arch/arm64/kernel/acpi/Makefile
create mode 100644 arch/arm64/kernel/acpi/acpi.c
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 8bdc6bd..d7d622f 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -34,7 +34,7 @@ arm64-obj-$(CONFIG_KGDB) += kgdb.o
arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o
arm64-obj-$(CONFIG_PCI) += pci.o
arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
-arm64-obj-$(CONFIG_ACPI) += acpi.o
+arm64-obj-$(CONFIG_ACPI) += acpi/
obj-y += $(arm64-obj-y) vdso/
obj-m += $(arm64-obj-m)
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
deleted file mode 100644
index ea3c9fc..0000000
--- a/arch/arm64/kernel/acpi.c
+++ /dev/null
@@ -1,359 +0,0 @@
-/*
- * ARM64 Specific Low-Level ACPI Boot Support
- *
- * Copyright (C) 2013-2014, Linaro Ltd.
- * Author: Al Stone <al.stone at linaro.org>
- * Author: Graeme Gregory <graeme.gregory at linaro.org>
- * Author: Hanjun Guo <hanjun.guo at linaro.org>
- * Author: Tomasz Nowicki <tomasz.nowicki at linaro.org>
- * Author: Naresh Bhat <naresh.bhat at linaro.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#define pr_fmt(fmt) "ACPI: " fmt
-
-#include <linux/init.h>
-#include <linux/acpi.h>
-#include <linux/cpumask.h>
-#include <linux/memblock.h>
-#include <linux/irq.h>
-#include <linux/irqdomain.h>
-#include <linux/bootmem.h>
-#include <linux/smp.h>
-#include <linux/irqchip/arm-gic-acpi.h>
-
-#include <asm/cputype.h>
-#include <asm/cpu_ops.h>
-
-int acpi_noirq; /* skip ACPI IRQ initialization */
-int acpi_disabled;
-EXPORT_SYMBOL(acpi_disabled);
-
-int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
-EXPORT_SYMBOL(acpi_pci_disabled);
-
-static int enabled_cpus; /* Processors (GICC) with enabled flag in MADT */
-
-/*
- * Since we're on ARM, the default interrupt routing model
- * clearly has to be GIC.
- */
-enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_GIC;
-
-/*
- * __acpi_map_table() will be called before page_init(), so early_ioremap()
- * or early_memremap() should be called here to for ACPI table mapping.
- */
-char *__init __acpi_map_table(unsigned long phys, unsigned long size)
-{
- if (!phys || !size)
- return NULL;
-
- return early_memremap(phys, size);
-}
-
-void __init __acpi_unmap_table(char *map, unsigned long size)
-{
- if (!map || !size)
- return;
-
- early_memunmap(map, size);
-}
-
-/**
- * acpi_map_gic_cpu_interface - generates a logical cpu number
- * and map to MPIDR represented by GICC structure
- * @mpidr: CPU's hardware id to register, MPIDR represented in MADT
- * @enabled: this cpu is enabled or not
- *
- * Returns the logical cpu number which maps to MPIDR
- */
-static int acpi_map_gic_cpu_interface(u64 mpidr, u8 enabled)
-{
- int cpu;
-
- if (mpidr == INVALID_HWID) {
- pr_info("Skip MADT cpu entry with invalid MPIDR\n");
- return -EINVAL;
- }
-
- total_cpus++;
- if (!enabled)
- return -EINVAL;
-
- if (enabled_cpus >= NR_CPUS) {
- pr_warn("NR_CPUS limit of %d reached, Processor %d/0x%llx ignored.\n",
- NR_CPUS, total_cpus, mpidr);
- return -EINVAL;
- }
-
- /* No need to check duplicate MPIDRs for the first CPU */
- if (enabled_cpus) {
- /*
- * Duplicate MPIDRs are a recipe for disaster. Scan
- * all initialized entries and check for
- * duplicates. If any is found just ignore the CPU.
- */
- for_each_possible_cpu(cpu) {
- if (cpu_logical_map(cpu) == mpidr) {
- pr_err("Firmware bug, duplicate CPU MPIDR: 0x%llx in MADT\n",
- mpidr);
- return -EINVAL;
- }
- }
-
- /* allocate a logical cpu id for the new comer */
- cpu = cpumask_next_zero(-1, cpu_possible_mask);
- } else {
- /*
- * First GICC entry must be BSP as ACPI spec said
- * in section 5.2.12.15
- */
- if (cpu_logical_map(0) != mpidr) {
- pr_err("First GICC entry with MPIDR 0x%llx is not BSP\n",
- mpidr);
- return -EINVAL;
- }
-
- /*
- * boot_cpu_init() already hold bit 0 in cpu_present_mask
- * for BSP, no need to allocate again.
- */
- cpu = 0;
- }
-
- /* CPU 0 was already initialized */
- if (cpu) {
- cpu_ops[cpu] = cpu_get_ops(acpi_psci_present() ? "psci" : NULL);
- if (!cpu_ops[cpu])
- return -EINVAL;
-
- if (cpu_ops[cpu]->cpu_init(NULL, cpu))
- return -EOPNOTSUPP;
-
- /* map the logical cpu id to cpu MPIDR */
- cpu_logical_map(cpu) = mpidr;
-
- set_cpu_possible(cpu, true);
- } else {
- /* get cpu0's ops, no need to return if ops is null */
- cpu_ops[0] = cpu_get_ops(acpi_psci_present() ? "psci" : NULL);
- }
-
- enabled_cpus++;
- return cpu;
-}
-
-static int __init
-acpi_parse_gic_cpu_interface(struct acpi_subtable_header *header,
- const unsigned long end)
-{
- struct acpi_madt_generic_interrupt *processor;
-
- processor = (struct acpi_madt_generic_interrupt *)header;
-
- if (BAD_MADT_ENTRY(processor, end))
- return -EINVAL;
-
- acpi_table_print_madt_entry(header);
-
- acpi_map_gic_cpu_interface(processor->arm_mpidr & MPIDR_HWID_BITMASK,
- processor->flags & ACPI_MADT_ENABLED);
-
- return 0;
-}
-
-/* Parse GIC cpu interface entries in MADT for SMP init */
-void __init acpi_smp_init_cpus(void)
-{
- int count;
-
- /*
- * do a partial walk of MADT to determine how many CPUs
- * we have including disabled CPUs, and get information
- * we need for SMP init
- */
- count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
- acpi_parse_gic_cpu_interface, 0);
-
- if (!count) {
- pr_err("No GIC CPU interface entries present\n");
- return;
- } else if (count < 0) {
- pr_err("Error parsing GIC CPU interface entry\n");
- return;
- }
-
- /* Make boot-up look pretty */
- pr_info("%d CPUs enabled, %d CPUs total\n", enabled_cpus, total_cpus);
-}
-
-int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
-{
- *irq = irq_find_mapping(NULL, gsi);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
-
-/*
- * success: return IRQ number (>0)
- * failure: return =< 0
- */
-int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
-{
- unsigned int irq;
- unsigned int irq_type;
-
- /*
- * ACPI have no bindings to indicate SPI or PPI, so we
- * use different mappings from DT in ACPI.
- *
- * For FDT
- * PPI interrupt: in the range [0, 15];
- * SPI interrupt: in the range [0, 987];
- *
- * For ACPI, GSI should be unique so using
- * the hwirq directly for the mapping:
- * PPI interrupt: in the range [16, 31];
- * SPI interrupt: in the range [32, 1019];
- */
-
- if (trigger == ACPI_EDGE_SENSITIVE &&
- polarity == ACPI_ACTIVE_LOW)
- irq_type = IRQ_TYPE_EDGE_FALLING;
- else if (trigger == ACPI_EDGE_SENSITIVE &&
- polarity == ACPI_ACTIVE_HIGH)
- irq_type = IRQ_TYPE_EDGE_RISING;
- else if (trigger == ACPI_LEVEL_SENSITIVE &&
- polarity == ACPI_ACTIVE_LOW)
- irq_type = IRQ_TYPE_LEVEL_LOW;
- else if (trigger == ACPI_LEVEL_SENSITIVE &&
- polarity == ACPI_ACTIVE_HIGH)
- irq_type = IRQ_TYPE_LEVEL_HIGH;
- else
- irq_type = IRQ_TYPE_NONE;
-
- /*
- * Since only one GIC is supported in ACPI 5.0, we can
- * create mapping refer to the default domain
- */
- irq = irq_create_mapping(NULL, gsi);
- if (!irq)
- return irq;
-
- /* Set irq type if specified and different than the current one */
- if (irq_type != IRQ_TYPE_NONE &&
- irq_type != irq_get_trigger_type(irq))
- irq_set_irq_type(irq, irq_type);
- return irq;
-}
-EXPORT_SYMBOL_GPL(acpi_register_gsi);
-
-void acpi_unregister_gsi(u32 gsi)
-{
-}
-EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
-
-static int __init acpi_parse_fadt(struct acpi_table_header *table)
-{
- struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table;
-
- /*
- * Revision in table header is the FADT Major revision,
- * and there is a minor revision of FADT which was introduced
- * by ACPI 5.1, we only deal with ACPI 5.1 or newer revision
- * to get arm boot flags, or we will disable ACPI.
- */
- if (table->revision > 5 ||
- (table->revision == 5 && fadt->minor_revision >= 1)) {
- /*
- * ACPI 5.1 only has two explicit methods to boot up SMP,
- * PSCI and Parking protocol, but the Parking protocol is
- * only specified for ARMv7 now, so make PSCI as the only
- * way for the SMP boot protocol before some updates for
- * the ACPI spec or the Parking protocol spec.
- */
- if (acpi_psci_present())
- return 0;
-
- pr_warn("No PSCI support, will not bring up secondary CPUs\n");
- return -EOPNOTSUPP;
- }
-
- pr_warn("Unsupported FADT revision %d.%d, should be 5.1+, will disable ACPI\n",
- table->revision, fadt->minor_revision);
- disable_acpi();
-
- return -EINVAL;
-}
-
-/*
- * acpi_boot_table_init() called from setup_arch(), always.
- * 1. find RSDP and get its address, and then find XSDT
- * 2. extract all tables and checksums them all
- * 3. check ACPI FADT revision
- *
- * We can parse ACPI boot-time tables such as MADT after
- * this function is called.
- */
-void __init acpi_boot_table_init(void)
-{
- /* If acpi_disabled, bail out */
- if (acpi_disabled)
- return;
-
- /* Initialize the ACPI boot-time table parser. */
- if (acpi_table_init()) {
- disable_acpi();
- return;
- }
-
- if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
- pr_err("Can't find FADT or error happened during parsing FADT\n");
-}
-
-void __init acpi_gic_init(void)
-{
- struct acpi_table_header *table;
- acpi_status status;
- acpi_size tbl_size;
- int err;
-
- if (acpi_disabled)
- return;
-
- status = acpi_get_table_with_size(ACPI_SIG_MADT, 0, &table, &tbl_size);
- if (ACPI_FAILURE(status)) {
- const char *msg = acpi_format_exception(status);
-
- pr_err("Failed to get MADT table, %s\n", msg);
- return;
- }
-
- err = gic_v2_acpi_init(table);
- if (err)
- pr_err("Failed to initialize GIC IRQ controller");
-
- early_acpi_os_unmap_memory((char *)table, tbl_size);
-}
-
-static int __init parse_acpi(char *arg)
-{
- if (!arg)
- return -EINVAL;
-
- /* "acpi=off" disables both ACPI table parsing and interpreter */
- if (strcmp(arg, "off") == 0)
- disable_acpi();
- else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
- enable_acpi();
- else
- return -EINVAL; /* Core will print when we return error */
-
- return 0;
-}
-early_param("acpi", parse_acpi);
diff --git a/arch/arm64/kernel/acpi/Makefile b/arch/arm64/kernel/acpi/Makefile
new file mode 100644
index 0000000..e049f94
--- /dev/null
+++ b/arch/arm64/kernel/acpi/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_ACPI) += acpi.o
diff --git a/arch/arm64/kernel/acpi/acpi.c b/arch/arm64/kernel/acpi/acpi.c
new file mode 100644
index 0000000..ea3c9fc
--- /dev/null
+++ b/arch/arm64/kernel/acpi/acpi.c
@@ -0,0 +1,359 @@
+/*
+ * ARM64 Specific Low-Level ACPI Boot Support
+ *
+ * Copyright (C) 2013-2014, Linaro Ltd.
+ * Author: Al Stone <al.stone at linaro.org>
+ * Author: Graeme Gregory <graeme.gregory at linaro.org>
+ * Author: Hanjun Guo <hanjun.guo at linaro.org>
+ * Author: Tomasz Nowicki <tomasz.nowicki at linaro.org>
+ * Author: Naresh Bhat <naresh.bhat at linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) "ACPI: " fmt
+
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/cpumask.h>
+#include <linux/memblock.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/bootmem.h>
+#include <linux/smp.h>
+#include <linux/irqchip/arm-gic-acpi.h>
+
+#include <asm/cputype.h>
+#include <asm/cpu_ops.h>
+
+int acpi_noirq; /* skip ACPI IRQ initialization */
+int acpi_disabled;
+EXPORT_SYMBOL(acpi_disabled);
+
+int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
+EXPORT_SYMBOL(acpi_pci_disabled);
+
+static int enabled_cpus; /* Processors (GICC) with enabled flag in MADT */
+
+/*
+ * Since we're on ARM, the default interrupt routing model
+ * clearly has to be GIC.
+ */
+enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_GIC;
+
+/*
+ * __acpi_map_table() will be called before page_init(), so early_ioremap()
+ * or early_memremap() should be called here to for ACPI table mapping.
+ */
+char *__init __acpi_map_table(unsigned long phys, unsigned long size)
+{
+ if (!phys || !size)
+ return NULL;
+
+ return early_memremap(phys, size);
+}
+
+void __init __acpi_unmap_table(char *map, unsigned long size)
+{
+ if (!map || !size)
+ return;
+
+ early_memunmap(map, size);
+}
+
+/**
+ * acpi_map_gic_cpu_interface - generates a logical cpu number
+ * and map to MPIDR represented by GICC structure
+ * @mpidr: CPU's hardware id to register, MPIDR represented in MADT
+ * @enabled: this cpu is enabled or not
+ *
+ * Returns the logical cpu number which maps to MPIDR
+ */
+static int acpi_map_gic_cpu_interface(u64 mpidr, u8 enabled)
+{
+ int cpu;
+
+ if (mpidr == INVALID_HWID) {
+ pr_info("Skip MADT cpu entry with invalid MPIDR\n");
+ return -EINVAL;
+ }
+
+ total_cpus++;
+ if (!enabled)
+ return -EINVAL;
+
+ if (enabled_cpus >= NR_CPUS) {
+ pr_warn("NR_CPUS limit of %d reached, Processor %d/0x%llx ignored.\n",
+ NR_CPUS, total_cpus, mpidr);
+ return -EINVAL;
+ }
+
+ /* No need to check duplicate MPIDRs for the first CPU */
+ if (enabled_cpus) {
+ /*
+ * Duplicate MPIDRs are a recipe for disaster. Scan
+ * all initialized entries and check for
+ * duplicates. If any is found just ignore the CPU.
+ */
+ for_each_possible_cpu(cpu) {
+ if (cpu_logical_map(cpu) == mpidr) {
+ pr_err("Firmware bug, duplicate CPU MPIDR: 0x%llx in MADT\n",
+ mpidr);
+ return -EINVAL;
+ }
+ }
+
+ /* allocate a logical cpu id for the new comer */
+ cpu = cpumask_next_zero(-1, cpu_possible_mask);
+ } else {
+ /*
+ * First GICC entry must be BSP as ACPI spec said
+ * in section 5.2.12.15
+ */
+ if (cpu_logical_map(0) != mpidr) {
+ pr_err("First GICC entry with MPIDR 0x%llx is not BSP\n",
+ mpidr);
+ return -EINVAL;
+ }
+
+ /*
+ * boot_cpu_init() already hold bit 0 in cpu_present_mask
+ * for BSP, no need to allocate again.
+ */
+ cpu = 0;
+ }
+
+ /* CPU 0 was already initialized */
+ if (cpu) {
+ cpu_ops[cpu] = cpu_get_ops(acpi_psci_present() ? "psci" : NULL);
+ if (!cpu_ops[cpu])
+ return -EINVAL;
+
+ if (cpu_ops[cpu]->cpu_init(NULL, cpu))
+ return -EOPNOTSUPP;
+
+ /* map the logical cpu id to cpu MPIDR */
+ cpu_logical_map(cpu) = mpidr;
+
+ set_cpu_possible(cpu, true);
+ } else {
+ /* get cpu0's ops, no need to return if ops is null */
+ cpu_ops[0] = cpu_get_ops(acpi_psci_present() ? "psci" : NULL);
+ }
+
+ enabled_cpus++;
+ return cpu;
+}
+
+static int __init
+acpi_parse_gic_cpu_interface(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ struct acpi_madt_generic_interrupt *processor;
+
+ processor = (struct acpi_madt_generic_interrupt *)header;
+
+ if (BAD_MADT_ENTRY(processor, end))
+ return -EINVAL;
+
+ acpi_table_print_madt_entry(header);
+
+ acpi_map_gic_cpu_interface(processor->arm_mpidr & MPIDR_HWID_BITMASK,
+ processor->flags & ACPI_MADT_ENABLED);
+
+ return 0;
+}
+
+/* Parse GIC cpu interface entries in MADT for SMP init */
+void __init acpi_smp_init_cpus(void)
+{
+ int count;
+
+ /*
+ * do a partial walk of MADT to determine how many CPUs
+ * we have including disabled CPUs, and get information
+ * we need for SMP init
+ */
+ count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
+ acpi_parse_gic_cpu_interface, 0);
+
+ if (!count) {
+ pr_err("No GIC CPU interface entries present\n");
+ return;
+ } else if (count < 0) {
+ pr_err("Error parsing GIC CPU interface entry\n");
+ return;
+ }
+
+ /* Make boot-up look pretty */
+ pr_info("%d CPUs enabled, %d CPUs total\n", enabled_cpus, total_cpus);
+}
+
+int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
+{
+ *irq = irq_find_mapping(NULL, gsi);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
+
+/*
+ * success: return IRQ number (>0)
+ * failure: return =< 0
+ */
+int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
+{
+ unsigned int irq;
+ unsigned int irq_type;
+
+ /*
+ * ACPI have no bindings to indicate SPI or PPI, so we
+ * use different mappings from DT in ACPI.
+ *
+ * For FDT
+ * PPI interrupt: in the range [0, 15];
+ * SPI interrupt: in the range [0, 987];
+ *
+ * For ACPI, GSI should be unique so using
+ * the hwirq directly for the mapping:
+ * PPI interrupt: in the range [16, 31];
+ * SPI interrupt: in the range [32, 1019];
+ */
+
+ if (trigger == ACPI_EDGE_SENSITIVE &&
+ polarity == ACPI_ACTIVE_LOW)
+ irq_type = IRQ_TYPE_EDGE_FALLING;
+ else if (trigger == ACPI_EDGE_SENSITIVE &&
+ polarity == ACPI_ACTIVE_HIGH)
+ irq_type = IRQ_TYPE_EDGE_RISING;
+ else if (trigger == ACPI_LEVEL_SENSITIVE &&
+ polarity == ACPI_ACTIVE_LOW)
+ irq_type = IRQ_TYPE_LEVEL_LOW;
+ else if (trigger == ACPI_LEVEL_SENSITIVE &&
+ polarity == ACPI_ACTIVE_HIGH)
+ irq_type = IRQ_TYPE_LEVEL_HIGH;
+ else
+ irq_type = IRQ_TYPE_NONE;
+
+ /*
+ * Since only one GIC is supported in ACPI 5.0, we can
+ * create mapping refer to the default domain
+ */
+ irq = irq_create_mapping(NULL, gsi);
+ if (!irq)
+ return irq;
+
+ /* Set irq type if specified and different than the current one */
+ if (irq_type != IRQ_TYPE_NONE &&
+ irq_type != irq_get_trigger_type(irq))
+ irq_set_irq_type(irq, irq_type);
+ return irq;
+}
+EXPORT_SYMBOL_GPL(acpi_register_gsi);
+
+void acpi_unregister_gsi(u32 gsi)
+{
+}
+EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
+
+static int __init acpi_parse_fadt(struct acpi_table_header *table)
+{
+ struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table;
+
+ /*
+ * Revision in table header is the FADT Major revision,
+ * and there is a minor revision of FADT which was introduced
+ * by ACPI 5.1, we only deal with ACPI 5.1 or newer revision
+ * to get arm boot flags, or we will disable ACPI.
+ */
+ if (table->revision > 5 ||
+ (table->revision == 5 && fadt->minor_revision >= 1)) {
+ /*
+ * ACPI 5.1 only has two explicit methods to boot up SMP,
+ * PSCI and Parking protocol, but the Parking protocol is
+ * only specified for ARMv7 now, so make PSCI as the only
+ * way for the SMP boot protocol before some updates for
+ * the ACPI spec or the Parking protocol spec.
+ */
+ if (acpi_psci_present())
+ return 0;
+
+ pr_warn("No PSCI support, will not bring up secondary CPUs\n");
+ return -EOPNOTSUPP;
+ }
+
+ pr_warn("Unsupported FADT revision %d.%d, should be 5.1+, will disable ACPI\n",
+ table->revision, fadt->minor_revision);
+ disable_acpi();
+
+ return -EINVAL;
+}
+
+/*
+ * acpi_boot_table_init() called from setup_arch(), always.
+ * 1. find RSDP and get its address, and then find XSDT
+ * 2. extract all tables and checksums them all
+ * 3. check ACPI FADT revision
+ *
+ * We can parse ACPI boot-time tables such as MADT after
+ * this function is called.
+ */
+void __init acpi_boot_table_init(void)
+{
+ /* If acpi_disabled, bail out */
+ if (acpi_disabled)
+ return;
+
+ /* Initialize the ACPI boot-time table parser. */
+ if (acpi_table_init()) {
+ disable_acpi();
+ return;
+ }
+
+ if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
+ pr_err("Can't find FADT or error happened during parsing FADT\n");
+}
+
+void __init acpi_gic_init(void)
+{
+ struct acpi_table_header *table;
+ acpi_status status;
+ acpi_size tbl_size;
+ int err;
+
+ if (acpi_disabled)
+ return;
+
+ status = acpi_get_table_with_size(ACPI_SIG_MADT, 0, &table, &tbl_size);
+ if (ACPI_FAILURE(status)) {
+ const char *msg = acpi_format_exception(status);
+
+ pr_err("Failed to get MADT table, %s\n", msg);
+ return;
+ }
+
+ err = gic_v2_acpi_init(table);
+ if (err)
+ pr_err("Failed to initialize GIC IRQ controller");
+
+ early_acpi_os_unmap_memory((char *)table, tbl_size);
+}
+
+static int __init parse_acpi(char *arg)
+{
+ if (!arg)
+ return -EINVAL;
+
+ /* "acpi=off" disables both ACPI table parsing and interpreter */
+ if (strcmp(arg, "off") == 0)
+ disable_acpi();
+ else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
+ enable_acpi();
+ else
+ return -EINVAL; /* Core will print when we return error */
+
+ return 0;
+}
+early_param("acpi", parse_acpi);
--
2.1.0
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