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![Shunyong Yang](/assets/img/avatar_default.png)
In some scenario, we need to build initrd with kernel in a single image. This can simplify system deployment process by downloading the whole system once, such as in IC verification. This patch adds support to override ACPI tables from built-in initrd. Signed-off-by: Shunyong Yang <shunyong.yang@hxt-semitech.com> [ rjw: Minor cleanups ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
811 lines
22 KiB
C
811 lines
22 KiB
C
/*
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* acpi_tables.c - ACPI Boot-Time Table Parsing
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*
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* Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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*/
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/* Uncomment next line to get verbose printout */
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/* #define DEBUG */
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#define pr_fmt(fmt) "ACPI: " fmt
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/smp.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/irq.h>
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#include <linux/errno.h>
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#include <linux/acpi.h>
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#include <linux/memblock.h>
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#include <linux/earlycpio.h>
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#include <linux/initrd.h>
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#include "internal.h"
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#ifdef CONFIG_ACPI_CUSTOM_DSDT
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#include CONFIG_ACPI_CUSTOM_DSDT_FILE
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#endif
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#define ACPI_MAX_TABLES 128
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static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
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static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
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static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
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static int acpi_apic_instance __initdata;
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/*
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* Disable table checksum verification for the early stage due to the size
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* limitation of the current x86 early mapping implementation.
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*/
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static bool acpi_verify_table_checksum __initdata = false;
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void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
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{
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if (!header)
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return;
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switch (header->type) {
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case ACPI_MADT_TYPE_LOCAL_APIC:
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{
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struct acpi_madt_local_apic *p =
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(struct acpi_madt_local_apic *)header;
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pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
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p->processor_id, p->id,
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(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
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}
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break;
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case ACPI_MADT_TYPE_LOCAL_X2APIC:
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{
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struct acpi_madt_local_x2apic *p =
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(struct acpi_madt_local_x2apic *)header;
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pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
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p->local_apic_id, p->uid,
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(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
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}
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break;
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case ACPI_MADT_TYPE_IO_APIC:
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{
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struct acpi_madt_io_apic *p =
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(struct acpi_madt_io_apic *)header;
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pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
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p->id, p->address, p->global_irq_base);
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}
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break;
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case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
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{
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struct acpi_madt_interrupt_override *p =
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(struct acpi_madt_interrupt_override *)header;
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pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
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p->bus, p->source_irq, p->global_irq,
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mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
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mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
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if (p->inti_flags &
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~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
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pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
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p->inti_flags &
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~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
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}
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break;
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case ACPI_MADT_TYPE_NMI_SOURCE:
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{
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struct acpi_madt_nmi_source *p =
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(struct acpi_madt_nmi_source *)header;
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pr_info("NMI_SRC (%s %s global_irq %d)\n",
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mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
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mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
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p->global_irq);
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}
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break;
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case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
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{
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struct acpi_madt_local_apic_nmi *p =
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(struct acpi_madt_local_apic_nmi *)header;
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pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
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p->processor_id,
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mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
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mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
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p->lint);
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}
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break;
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case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
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{
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u16 polarity, trigger;
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struct acpi_madt_local_x2apic_nmi *p =
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(struct acpi_madt_local_x2apic_nmi *)header;
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polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
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trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
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pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
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p->uid,
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mps_inti_flags_polarity[polarity],
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mps_inti_flags_trigger[trigger],
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p->lint);
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}
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break;
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case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
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{
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struct acpi_madt_local_apic_override *p =
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(struct acpi_madt_local_apic_override *)header;
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pr_info("LAPIC_ADDR_OVR (address[%p])\n",
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(void *)(unsigned long)p->address);
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}
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break;
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case ACPI_MADT_TYPE_IO_SAPIC:
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{
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struct acpi_madt_io_sapic *p =
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(struct acpi_madt_io_sapic *)header;
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pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
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p->id, (void *)(unsigned long)p->address,
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p->global_irq_base);
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}
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break;
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case ACPI_MADT_TYPE_LOCAL_SAPIC:
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{
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struct acpi_madt_local_sapic *p =
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(struct acpi_madt_local_sapic *)header;
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pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
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p->processor_id, p->id, p->eid,
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(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
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}
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break;
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case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
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{
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struct acpi_madt_interrupt_source *p =
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(struct acpi_madt_interrupt_source *)header;
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pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
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mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
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mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
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p->type, p->id, p->eid, p->io_sapic_vector,
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p->global_irq);
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}
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break;
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case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
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{
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struct acpi_madt_generic_interrupt *p =
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(struct acpi_madt_generic_interrupt *)header;
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pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
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p->uid, p->base_address,
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p->arm_mpidr,
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(p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
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}
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break;
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case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
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{
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struct acpi_madt_generic_distributor *p =
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(struct acpi_madt_generic_distributor *)header;
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pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
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p->gic_id, p->base_address,
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p->global_irq_base);
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}
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break;
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default:
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pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
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header->type);
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break;
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}
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}
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/**
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* acpi_parse_entries_array - for each proc_num find a suitable subtable
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*
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* @id: table id (for debugging purposes)
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* @table_size: size of the root table
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* @table_header: where does the table start?
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* @proc: array of acpi_subtable_proc struct containing entry id
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* and associated handler with it
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* @proc_num: how big proc is?
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* @max_entries: how many entries can we process?
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*
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* For each proc_num find a subtable with proc->id and run proc->handler
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* on it. Assumption is that there's only single handler for particular
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* entry id.
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*
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* The table_size is not the size of the complete ACPI table (the length
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* field in the header struct), but only the size of the root table; i.e.,
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* the offset from the very first byte of the complete ACPI table, to the
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* first byte of the very first subtable.
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*
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* On success returns sum of all matching entries for all proc handlers.
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* Otherwise, -ENODEV or -EINVAL is returned.
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*/
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static int __init
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acpi_parse_entries_array(char *id, unsigned long table_size,
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struct acpi_table_header *table_header,
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struct acpi_subtable_proc *proc, int proc_num,
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unsigned int max_entries)
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{
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struct acpi_subtable_header *entry;
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unsigned long table_end;
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int count = 0;
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int errs = 0;
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int i;
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if (acpi_disabled)
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return -ENODEV;
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if (!id)
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return -EINVAL;
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if (!table_size)
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return -EINVAL;
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if (!table_header) {
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pr_warn("%4.4s not present\n", id);
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return -ENODEV;
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}
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table_end = (unsigned long)table_header + table_header->length;
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/* Parse all entries looking for a match. */
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entry = (struct acpi_subtable_header *)
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((unsigned long)table_header + table_size);
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while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
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table_end) {
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if (max_entries && count >= max_entries)
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break;
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for (i = 0; i < proc_num; i++) {
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if (entry->type != proc[i].id)
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continue;
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if (!proc[i].handler ||
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(!errs && proc[i].handler(entry, table_end))) {
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errs++;
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continue;
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}
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proc[i].count++;
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break;
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}
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if (i != proc_num)
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count++;
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/*
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* If entry->length is 0, break from this loop to avoid
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* infinite loop.
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*/
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if (entry->length == 0) {
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pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
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return -EINVAL;
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}
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entry = (struct acpi_subtable_header *)
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((unsigned long)entry + entry->length);
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}
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if (max_entries && count > max_entries) {
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pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
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id, proc->id, count);
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}
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return errs ? -EINVAL : count;
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}
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int __init
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acpi_table_parse_entries_array(char *id,
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unsigned long table_size,
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struct acpi_subtable_proc *proc, int proc_num,
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unsigned int max_entries)
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{
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struct acpi_table_header *table_header = NULL;
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int count;
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u32 instance = 0;
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if (acpi_disabled)
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return -ENODEV;
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if (!id)
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return -EINVAL;
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if (!strncmp(id, ACPI_SIG_MADT, 4))
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instance = acpi_apic_instance;
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acpi_get_table(id, instance, &table_header);
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if (!table_header) {
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pr_warn("%4.4s not present\n", id);
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return -ENODEV;
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}
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count = acpi_parse_entries_array(id, table_size, table_header,
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proc, proc_num, max_entries);
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acpi_put_table(table_header);
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return count;
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}
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int __init
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acpi_table_parse_entries(char *id,
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unsigned long table_size,
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int entry_id,
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acpi_tbl_entry_handler handler,
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unsigned int max_entries)
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{
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struct acpi_subtable_proc proc = {
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.id = entry_id,
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.handler = handler,
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};
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return acpi_table_parse_entries_array(id, table_size, &proc, 1,
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max_entries);
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}
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int __init
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acpi_table_parse_madt(enum acpi_madt_type id,
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acpi_tbl_entry_handler handler, unsigned int max_entries)
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{
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return acpi_table_parse_entries(ACPI_SIG_MADT,
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sizeof(struct acpi_table_madt), id,
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handler, max_entries);
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}
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/**
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* acpi_table_parse - find table with @id, run @handler on it
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* @id: table id to find
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* @handler: handler to run
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*
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* Scan the ACPI System Descriptor Table (STD) for a table matching @id,
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* run @handler on it.
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*
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* Return 0 if table found, -errno if not.
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*/
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int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
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{
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struct acpi_table_header *table = NULL;
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if (acpi_disabled)
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return -ENODEV;
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if (!id || !handler)
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return -EINVAL;
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if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
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acpi_get_table(id, acpi_apic_instance, &table);
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else
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acpi_get_table(id, 0, &table);
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if (table) {
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handler(table);
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acpi_put_table(table);
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return 0;
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} else
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return -ENODEV;
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}
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/*
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* The BIOS is supposed to supply a single APIC/MADT,
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* but some report two. Provide a knob to use either.
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* (don't you wish instance 0 and 1 were not the same?)
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*/
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static void __init check_multiple_madt(void)
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{
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struct acpi_table_header *table = NULL;
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acpi_get_table(ACPI_SIG_MADT, 2, &table);
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if (table) {
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pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
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acpi_apic_instance);
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pr_warn("If \"acpi_apic_instance=%d\" works better, "
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"notify linux-acpi@vger.kernel.org\n",
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acpi_apic_instance ? 0 : 2);
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acpi_put_table(table);
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} else
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acpi_apic_instance = 0;
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return;
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}
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static void acpi_table_taint(struct acpi_table_header *table)
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{
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pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
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table->signature, table->oem_table_id);
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add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
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}
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#ifdef CONFIG_ACPI_TABLE_UPGRADE
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static u64 acpi_tables_addr;
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static int all_tables_size;
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/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
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static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
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{
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u8 sum = 0;
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u8 *end = buffer + length;
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while (buffer < end)
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sum = (u8) (sum + *(buffer++));
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return sum;
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}
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/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
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static const char * const table_sigs[] = {
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ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
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ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
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ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
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ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
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ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
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ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
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ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
|
|
ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
|
|
ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, ACPI_SIG_IORT,
|
|
ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, NULL };
|
|
|
|
#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
|
|
|
|
#define NR_ACPI_INITRD_TABLES 64
|
|
static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
|
|
static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
|
|
|
|
#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
|
|
|
|
void __init acpi_table_upgrade(void)
|
|
{
|
|
void *data;
|
|
size_t size;
|
|
int sig, no, table_nr = 0, total_offset = 0;
|
|
long offset = 0;
|
|
struct acpi_table_header *table;
|
|
char cpio_path[32] = "kernel/firmware/acpi/";
|
|
struct cpio_data file;
|
|
|
|
if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
|
|
data = __initramfs_start;
|
|
size = __initramfs_size;
|
|
} else {
|
|
data = (void *)initrd_start;
|
|
size = initrd_end - initrd_start;
|
|
}
|
|
|
|
if (data == NULL || size == 0)
|
|
return;
|
|
|
|
for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
|
|
file = find_cpio_data(cpio_path, data, size, &offset);
|
|
if (!file.data)
|
|
break;
|
|
|
|
data += offset;
|
|
size -= offset;
|
|
|
|
if (file.size < sizeof(struct acpi_table_header)) {
|
|
pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
|
|
cpio_path, file.name);
|
|
continue;
|
|
}
|
|
|
|
table = file.data;
|
|
|
|
for (sig = 0; table_sigs[sig]; sig++)
|
|
if (!memcmp(table->signature, table_sigs[sig], 4))
|
|
break;
|
|
|
|
if (!table_sigs[sig]) {
|
|
pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
|
|
cpio_path, file.name);
|
|
continue;
|
|
}
|
|
if (file.size != table->length) {
|
|
pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
|
|
cpio_path, file.name);
|
|
continue;
|
|
}
|
|
if (acpi_table_checksum(file.data, table->length)) {
|
|
pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
|
|
cpio_path, file.name);
|
|
continue;
|
|
}
|
|
|
|
pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
|
|
table->signature, cpio_path, file.name, table->length);
|
|
|
|
all_tables_size += table->length;
|
|
acpi_initrd_files[table_nr].data = file.data;
|
|
acpi_initrd_files[table_nr].size = file.size;
|
|
table_nr++;
|
|
}
|
|
if (table_nr == 0)
|
|
return;
|
|
|
|
acpi_tables_addr =
|
|
memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS,
|
|
all_tables_size, PAGE_SIZE);
|
|
if (!acpi_tables_addr) {
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
/*
|
|
* Only calling e820_add_reserve does not work and the
|
|
* tables are invalid (memory got used) later.
|
|
* memblock_reserve works as expected and the tables won't get modified.
|
|
* But it's not enough on X86 because ioremap will
|
|
* complain later (used by acpi_os_map_memory) that the pages
|
|
* that should get mapped are not marked "reserved".
|
|
* Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
|
|
* works fine.
|
|
*/
|
|
memblock_reserve(acpi_tables_addr, all_tables_size);
|
|
arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
|
|
|
|
/*
|
|
* early_ioremap only can remap 256k one time. If we map all
|
|
* tables one time, we will hit the limit. Need to map chunks
|
|
* one by one during copying the same as that in relocate_initrd().
|
|
*/
|
|
for (no = 0; no < table_nr; no++) {
|
|
unsigned char *src_p = acpi_initrd_files[no].data;
|
|
phys_addr_t size = acpi_initrd_files[no].size;
|
|
phys_addr_t dest_addr = acpi_tables_addr + total_offset;
|
|
phys_addr_t slop, clen;
|
|
char *dest_p;
|
|
|
|
total_offset += size;
|
|
|
|
while (size) {
|
|
slop = dest_addr & ~PAGE_MASK;
|
|
clen = size;
|
|
if (clen > MAP_CHUNK_SIZE - slop)
|
|
clen = MAP_CHUNK_SIZE - slop;
|
|
dest_p = early_memremap(dest_addr & PAGE_MASK,
|
|
clen + slop);
|
|
memcpy(dest_p + slop, src_p, clen);
|
|
early_memunmap(dest_p, clen + slop);
|
|
src_p += clen;
|
|
dest_addr += clen;
|
|
size -= clen;
|
|
}
|
|
}
|
|
}
|
|
|
|
static acpi_status
|
|
acpi_table_initrd_override(struct acpi_table_header *existing_table,
|
|
acpi_physical_address *address, u32 *length)
|
|
{
|
|
int table_offset = 0;
|
|
int table_index = 0;
|
|
struct acpi_table_header *table;
|
|
u32 table_length;
|
|
|
|
*length = 0;
|
|
*address = 0;
|
|
if (!acpi_tables_addr)
|
|
return AE_OK;
|
|
|
|
while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
|
|
table = acpi_os_map_memory(acpi_tables_addr + table_offset,
|
|
ACPI_HEADER_SIZE);
|
|
if (table_offset + table->length > all_tables_size) {
|
|
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
|
|
WARN_ON(1);
|
|
return AE_OK;
|
|
}
|
|
|
|
table_length = table->length;
|
|
|
|
/* Only override tables matched */
|
|
if (memcmp(existing_table->signature, table->signature, 4) ||
|
|
memcmp(table->oem_id, existing_table->oem_id,
|
|
ACPI_OEM_ID_SIZE) ||
|
|
memcmp(table->oem_table_id, existing_table->oem_table_id,
|
|
ACPI_OEM_TABLE_ID_SIZE)) {
|
|
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
|
|
goto next_table;
|
|
}
|
|
/*
|
|
* Mark the table to avoid being used in
|
|
* acpi_table_initrd_scan() and check the revision.
|
|
*/
|
|
if (test_and_set_bit(table_index, acpi_initrd_installed) ||
|
|
existing_table->oem_revision >= table->oem_revision) {
|
|
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
|
|
goto next_table;
|
|
}
|
|
|
|
*length = table_length;
|
|
*address = acpi_tables_addr + table_offset;
|
|
pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
|
|
table->signature, table->oem_id,
|
|
table->oem_table_id);
|
|
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
|
|
break;
|
|
|
|
next_table:
|
|
table_offset += table_length;
|
|
table_index++;
|
|
}
|
|
return AE_OK;
|
|
}
|
|
|
|
static void __init acpi_table_initrd_scan(void)
|
|
{
|
|
int table_offset = 0;
|
|
int table_index = 0;
|
|
u32 table_length;
|
|
struct acpi_table_header *table;
|
|
|
|
if (!acpi_tables_addr)
|
|
return;
|
|
|
|
while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
|
|
table = acpi_os_map_memory(acpi_tables_addr + table_offset,
|
|
ACPI_HEADER_SIZE);
|
|
if (table_offset + table->length > all_tables_size) {
|
|
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
|
|
table_length = table->length;
|
|
|
|
/* Skip RSDT/XSDT which should only be used for override */
|
|
if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) ||
|
|
ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) {
|
|
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
|
|
goto next_table;
|
|
}
|
|
/*
|
|
* Mark the table to avoid being used in
|
|
* acpi_table_initrd_override(). Though this is not possible
|
|
* because override is disabled in acpi_install_table().
|
|
*/
|
|
if (test_and_set_bit(table_index, acpi_initrd_installed)) {
|
|
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
|
|
goto next_table;
|
|
}
|
|
|
|
pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
|
|
table->signature, table->oem_id,
|
|
table->oem_table_id);
|
|
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
|
|
acpi_install_table(acpi_tables_addr + table_offset, TRUE);
|
|
next_table:
|
|
table_offset += table_length;
|
|
table_index++;
|
|
}
|
|
}
|
|
#else
|
|
static acpi_status
|
|
acpi_table_initrd_override(struct acpi_table_header *existing_table,
|
|
acpi_physical_address *address,
|
|
u32 *table_length)
|
|
{
|
|
*table_length = 0;
|
|
*address = 0;
|
|
return AE_OK;
|
|
}
|
|
|
|
static void __init acpi_table_initrd_scan(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_ACPI_TABLE_UPGRADE */
|
|
|
|
acpi_status
|
|
acpi_os_physical_table_override(struct acpi_table_header *existing_table,
|
|
acpi_physical_address *address,
|
|
u32 *table_length)
|
|
{
|
|
return acpi_table_initrd_override(existing_table, address,
|
|
table_length);
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI_CUSTOM_DSDT
|
|
static void *amlcode __attribute__ ((weakref("AmlCode")));
|
|
static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
|
|
#endif
|
|
|
|
acpi_status
|
|
acpi_os_table_override(struct acpi_table_header *existing_table,
|
|
struct acpi_table_header **new_table)
|
|
{
|
|
if (!existing_table || !new_table)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
*new_table = NULL;
|
|
|
|
#ifdef CONFIG_ACPI_CUSTOM_DSDT
|
|
if (!strncmp(existing_table->signature, "DSDT", 4)) {
|
|
*new_table = (struct acpi_table_header *)&amlcode;
|
|
if (!(*new_table))
|
|
*new_table = (struct acpi_table_header *)&dsdt_amlcode;
|
|
}
|
|
#endif
|
|
if (*new_table != NULL)
|
|
acpi_table_taint(existing_table);
|
|
return AE_OK;
|
|
}
|
|
|
|
/*
|
|
* acpi_table_init()
|
|
*
|
|
* find RSDP, find and checksum SDT/XSDT.
|
|
* checksum all tables, print SDT/XSDT
|
|
*
|
|
* result: sdt_entry[] is initialized
|
|
*/
|
|
|
|
int __init acpi_table_init(void)
|
|
{
|
|
acpi_status status;
|
|
|
|
if (acpi_verify_table_checksum) {
|
|
pr_info("Early table checksum verification enabled\n");
|
|
acpi_gbl_enable_table_validation = TRUE;
|
|
} else {
|
|
pr_info("Early table checksum verification disabled\n");
|
|
acpi_gbl_enable_table_validation = FALSE;
|
|
}
|
|
|
|
status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
|
|
if (ACPI_FAILURE(status))
|
|
return -EINVAL;
|
|
acpi_table_initrd_scan();
|
|
|
|
check_multiple_madt();
|
|
return 0;
|
|
}
|
|
|
|
static int __init acpi_parse_apic_instance(char *str)
|
|
{
|
|
if (!str)
|
|
return -EINVAL;
|
|
|
|
if (kstrtoint(str, 0, &acpi_apic_instance))
|
|
return -EINVAL;
|
|
|
|
pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
|
|
|
|
return 0;
|
|
}
|
|
|
|
early_param("acpi_apic_instance", acpi_parse_apic_instance);
|
|
|
|
static int __init acpi_force_table_verification_setup(char *s)
|
|
{
|
|
acpi_verify_table_checksum = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
|
|
|
|
static int __init acpi_force_32bit_fadt_addr(char *s)
|
|
{
|
|
pr_info("Forcing 32 Bit FADT addresses\n");
|
|
acpi_gbl_use32_bit_fadt_addresses = TRUE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);
|