patch-2.4.22 linux-2.4.22/arch/i386/kernel/acpi.c
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- Lines: 609
- Date:
2003-08-25 04:44:39.000000000 -0700
- Orig file:
linux-2.4.21/arch/i386/kernel/acpi.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.21/arch/i386/kernel/acpi.c linux-2.4.22/arch/i386/kernel/acpi.c
@@ -0,0 +1,608 @@
+/*
+ * acpi.c - Architecture-Specific Low-Level ACPI Support
+ *
+ * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ * Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
+ * Copyright (C) 2001 Patrick Mochel <mochel@osdl.org>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/bootmem.h>
+#include <linux/irq.h>
+#include <linux/acpi.h>
+#include <asm/mpspec.h>
+#include <asm/io.h>
+#include <asm/apic.h>
+#include <asm/apicdef.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/io_apic.h>
+#include <asm/acpi.h>
+#include <asm/save_state.h>
+#include <asm/smpboot.h>
+
+
+#define PREFIX "ACPI: "
+
+int acpi_lapic = 0;
+int acpi_ioapic = 0;
+
+/* --------------------------------------------------------------------------
+ Boot-time Configuration
+ -------------------------------------------------------------------------- */
+
+#ifdef CONFIG_ACPI_BOOT
+extern int acpi_disabled;
+extern int acpi_ht;
+
+enum acpi_irq_model_id acpi_irq_model;
+
+
+/*
+ * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
+ * to map the target physical address. The problem is that set_fixmap()
+ * provides a single page, and it is possible that the page is not
+ * sufficient.
+ * By using this area, we can map up to MAX_IO_APICS pages temporarily,
+ * i.e. until the next __va_range() call.
+ *
+ * Important Safety Note: The fixed I/O APIC page numbers are *subtracted*
+ * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and
+ * count idx down while incrementing the phys address.
+ */
+char *__acpi_map_table(unsigned long phys, unsigned long size)
+{
+ unsigned long base, offset, mapped_size;
+ int idx;
+
+ if (phys + size < 8*1024*1024)
+ return __va(phys);
+
+ offset = phys & (PAGE_SIZE - 1);
+ mapped_size = PAGE_SIZE - offset;
+ set_fixmap(FIX_ACPI_END, phys);
+ base = fix_to_virt(FIX_ACPI_END);
+
+ /*
+ * Most cases can be covered by the below.
+ */
+ idx = FIX_ACPI_END;
+ while (mapped_size < size) {
+ if (--idx < FIX_ACPI_BEGIN)
+ return 0; /* cannot handle this */
+ phys += PAGE_SIZE;
+ set_fixmap(idx, phys);
+ mapped_size += PAGE_SIZE;
+ }
+
+ return ((unsigned char *) base + offset);
+}
+
+
+#ifdef CONFIG_X86_LOCAL_APIC
+
+static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
+
+
+static int __init
+acpi_parse_madt (
+ unsigned long phys_addr,
+ unsigned long size)
+{
+ struct acpi_table_madt *madt = NULL;
+
+ if (!phys_addr || !size)
+ return -EINVAL;
+
+ madt = (struct acpi_table_madt *) __acpi_map_table(phys_addr, size);
+ if (!madt) {
+ printk(KERN_WARNING PREFIX "Unable to map MADT\n");
+ return -ENODEV;
+ }
+
+ if (madt->lapic_address)
+ acpi_lapic_addr = (u64) madt->lapic_address;
+
+ printk(KERN_INFO PREFIX "Local APIC address 0x%08x\n",
+ madt->lapic_address);
+
+ detect_clustered_apic(madt->header.oem_id, madt->header.oem_table_id);
+
+ return 0;
+}
+
+
+static int __init
+acpi_parse_lapic (
+ acpi_table_entry_header *header)
+{
+ struct acpi_table_lapic *processor = NULL;
+
+ processor = (struct acpi_table_lapic*) header;
+ if (!processor)
+ return -EINVAL;
+
+ acpi_table_print_madt_entry(header);
+
+ mp_register_lapic (
+ processor->id, /* APIC ID */
+ processor->flags.enabled); /* Enabled? */
+
+ return 0;
+}
+
+
+static int __init
+acpi_parse_lapic_addr_ovr (
+ acpi_table_entry_header *header)
+{
+ struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;
+
+ lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr*) header;
+ if (!lapic_addr_ovr)
+ return -EINVAL;
+
+ acpi_lapic_addr = lapic_addr_ovr->address;
+
+ return 0;
+}
+
+static int __init
+acpi_parse_lapic_nmi (
+ acpi_table_entry_header *header)
+{
+ struct acpi_table_lapic_nmi *lapic_nmi = NULL;
+
+ lapic_nmi = (struct acpi_table_lapic_nmi*) header;
+ if (!lapic_nmi)
+ return -EINVAL;
+
+ acpi_table_print_madt_entry(header);
+
+ if (lapic_nmi->lint != 1)
+ printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
+
+ return 0;
+}
+
+#endif /*CONFIG_X86_LOCAL_APIC*/
+
+#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)
+
+static int __init
+acpi_parse_ioapic (
+ acpi_table_entry_header *header)
+{
+ struct acpi_table_ioapic *ioapic = NULL;
+
+ ioapic = (struct acpi_table_ioapic*) header;
+ if (!ioapic)
+ return -EINVAL;
+
+ acpi_table_print_madt_entry(header);
+
+ mp_register_ioapic (
+ ioapic->id,
+ ioapic->address,
+ ioapic->global_irq_base);
+
+ return 0;
+}
+
+
+static int __init
+acpi_parse_int_src_ovr (
+ acpi_table_entry_header *header)
+{
+ struct acpi_table_int_src_ovr *intsrc = NULL;
+
+ intsrc = (struct acpi_table_int_src_ovr*) header;
+ if (!intsrc)
+ return -EINVAL;
+
+ acpi_table_print_madt_entry(header);
+
+ mp_override_legacy_irq (
+ intsrc->bus_irq,
+ intsrc->flags.polarity,
+ intsrc->flags.trigger,
+ intsrc->global_irq);
+
+ return 0;
+}
+
+
+static int __init
+acpi_parse_nmi_src (
+ acpi_table_entry_header *header)
+{
+ struct acpi_table_nmi_src *nmi_src = NULL;
+
+ nmi_src = (struct acpi_table_nmi_src*) header;
+ if (!nmi_src)
+ return -EINVAL;
+
+ acpi_table_print_madt_entry(header);
+
+ /* TBD: Support nimsrc entries? */
+
+ return 0;
+}
+
+#endif /*CONFIG_X86_IO_APIC && CONFIG_ACPI_INTERPRETER*/
+
+
+static unsigned long __init
+acpi_scan_rsdp (
+ unsigned long start,
+ unsigned long length)
+{
+ unsigned long offset = 0;
+ unsigned long sig_len = sizeof("RSD PTR ") - 1;
+
+ /*
+ * Scan all 16-byte boundaries of the physical memory region for the
+ * RSDP signature.
+ */
+ for (offset = 0; offset < length; offset += 16) {
+ if (strncmp((char *) (start + offset), "RSD PTR ", sig_len))
+ continue;
+ return (start + offset);
+ }
+
+ return 0;
+}
+
+
+unsigned long __init
+acpi_find_rsdp (void)
+{
+ unsigned long rsdp_phys = 0;
+
+ /*
+ * Scan memory looking for the RSDP signature. First search EBDA (low
+ * memory) paragraphs and then search upper memory (E0000-FFFFF).
+ */
+ rsdp_phys = acpi_scan_rsdp (0, 0x400);
+ if (!rsdp_phys)
+ rsdp_phys = acpi_scan_rsdp (0xE0000, 0xFFFFF);
+
+ return rsdp_phys;
+}
+
+
+/*
+ * acpi_boot_init()
+ * called from setup_arch(), always.
+ * 1. maps ACPI tables for later use
+ * 2. enumerates lapics
+ * 3. enumerates io-apics
+ *
+ * side effects:
+ * acpi_lapic = 1 if LAPIC found
+ * acpi_ioapic = 1 if IOAPIC found
+ * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
+ * if acpi_blacklisted() acpi_disabled = 1;
+ * acpi_irq_model=...
+ * ...
+ *
+ * return value: (currently ignored)
+ * 0: success
+ * !0: failure
+ */
+int __init
+acpi_boot_init (void)
+{
+ int result = 0;
+
+ if (acpi_disabled && !acpi_ht)
+ return(1);
+
+ /*
+ * The default interrupt routing model is PIC (8259). This gets
+ * overriden if IOAPICs are enumerated (below).
+ */
+ acpi_irq_model = ACPI_IRQ_MODEL_PIC;
+
+ /*
+ * Initialize the ACPI boot-time table parser.
+ */
+ result = acpi_table_init();
+ if (result)
+ return result;
+
+ result = acpi_blacklisted();
+ if (result) {
+ printk(KERN_NOTICE PREFIX "BIOS listed in blacklist, disabling ACPI support\n");
+ acpi_disabled = 1;
+ return result;
+ }
+
+#ifdef CONFIG_X86_LOCAL_APIC
+
+ /*
+ * MADT
+ * ----
+ * Parse the Multiple APIC Description Table (MADT), if exists.
+ * Note that this table provides platform SMP configuration
+ * information -- the successor to MPS tables.
+ */
+
+ result = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
+ if (!result) {
+ printk(KERN_WARNING PREFIX "MADT not present\n");
+ return 0;
+ }
+ else if (result < 0) {
+ printk(KERN_ERR PREFIX "Error parsing MADT\n");
+ return result;
+ }
+ else if (result > 1)
+ printk(KERN_WARNING PREFIX "Multiple MADT tables exist\n");
+
+ /*
+ * Local APIC
+ * ----------
+ * Note that the LAPIC address is obtained from the MADT (32-bit value)
+ * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
+ */
+
+ result = acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR, acpi_parse_lapic_addr_ovr);
+ if (result < 0) {
+ printk(KERN_ERR PREFIX "Error parsing LAPIC address override entry\n");
+ return result;
+ }
+
+ mp_register_lapic_address(acpi_lapic_addr);
+
+ result = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic);
+ if (!result) {
+ printk(KERN_ERR PREFIX "No LAPIC entries present\n");
+ /* TBD: Cleanup to allow fallback to MPS */
+ return -ENODEV;
+ }
+ else if (result < 0) {
+ printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
+ /* TBD: Cleanup to allow fallback to MPS */
+ return result;
+ }
+
+ result = acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi);
+ if (result < 0) {
+ printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
+ /* TBD: Cleanup to allow fallback to MPS */
+ return result;
+ }
+
+ acpi_lapic = 1;
+
+#endif /*CONFIG_X86_LOCAL_APIC*/
+
+#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)
+
+ /*
+ * I/O APIC
+ * --------
+ */
+
+ /*
+ * ACPI interpreter is required to complete interrupt setup,
+ * so if it is off, don't enumerate the io-apics with ACPI.
+ * If MPS is present, it will handle them,
+ * otherwise the system will stay in PIC mode
+ */
+ if (acpi_disabled) {
+ return 1;
+ }
+
+ /*
+ * if "noapic" boot option, don't look for IO-APICs
+ */
+ if (ioapic_setup_disabled()) {
+ printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
+ "due to 'noapic' option.\n");
+ return 1;
+ }
+
+
+ result = acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic);
+ if (!result) {
+ printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
+ return -ENODEV;
+ }
+ else if (result < 0) {
+ printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
+ return result;
+ }
+
+ /* Build a default routing table for legacy (ISA) interrupts. */
+ mp_config_acpi_legacy_irqs();
+
+ result = acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr);
+ if (result < 0) {
+ printk(KERN_ERR PREFIX "Error parsing interrupt source overrides entry\n");
+ /* TBD: Cleanup to allow fallback to MPS */
+ return result;
+ }
+
+ result = acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src);
+ if (result < 0) {
+ printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
+ /* TBD: Cleanup to allow fallback to MPS */
+ return result;
+ }
+
+ acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
+
+ acpi_ioapic = 1;
+
+ if (acpi_lapic && acpi_ioapic)
+ smp_found_config = 1;
+
+#endif /*CONFIG_X86_IO_APIC && CONFIG_ACPI_INTERPRETER*/
+
+ return 0;
+}
+
+#endif /*CONFIG_ACPI_BOOT*/
+
+
+/* --------------------------------------------------------------------------
+ Low-Level Sleep Support
+ -------------------------------------------------------------------------- */
+
+#ifdef CONFIG_ACPI_SLEEP
+
+#define DEBUG
+
+#ifdef DEBUG
+#include <linux/serial.h>
+#endif
+
+/* address in low memory of the wakeup routine. */
+unsigned long acpi_wakeup_address = 0;
+
+/* new page directory that we will be using */
+static pmd_t *pmd;
+
+/* saved page directory */
+static pmd_t saved_pmd;
+
+/* page which we'll use for the new page directory */
+static pte_t *ptep;
+
+extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long));
+
+/*
+ * acpi_create_identity_pmd
+ *
+ * Create a new, identity mapped pmd.
+ *
+ * Do this by creating new page directory, and marking all the pages as R/W
+ * Then set it as the new Page Middle Directory.
+ * And, of course, flush the TLB so it takes effect.
+ *
+ * We save the address of the old one, for later restoration.
+ */
+static void acpi_create_identity_pmd (void)
+{
+ pgd_t *pgd;
+ int i;
+
+ ptep = (pte_t*)__get_free_page(GFP_KERNEL);
+
+ /* fill page with low mapping */
+ for (i = 0; i < PTRS_PER_PTE; i++)
+ set_pte(ptep + i, mk_pte_phys(i << PAGE_SHIFT, PAGE_SHARED));
+
+ pgd = pgd_offset(current->active_mm, 0);
+ pmd = pmd_alloc(current->mm,pgd, 0);
+
+ /* save the old pmd */
+ saved_pmd = *pmd;
+
+ /* set the new one */
+ set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(ptep)));
+
+ /* flush the TLB */
+ local_flush_tlb();
+}
+
+/*
+ * acpi_restore_pmd
+ *
+ * Restore the old pmd saved by acpi_create_identity_pmd and
+ * free the page that said function alloc'd
+ */
+static void acpi_restore_pmd (void)
+{
+ set_pmd(pmd, saved_pmd);
+ local_flush_tlb();
+ free_page((unsigned long)ptep);
+}
+
+/**
+ * acpi_save_state_mem - save kernel state
+ *
+ * Create an identity mapped page table and copy the wakeup routine to
+ * low memory.
+ */
+int acpi_save_state_mem (void)
+{
+ acpi_create_identity_pmd();
+ acpi_copy_wakeup_routine(acpi_wakeup_address);
+
+ return 0;
+}
+
+/**
+ * acpi_save_state_disk - save kernel state to disk
+ *
+ */
+int acpi_save_state_disk (void)
+{
+ return 1;
+}
+
+/*
+ * acpi_restore_state
+ */
+void acpi_restore_state_mem (void)
+{
+ acpi_restore_pmd();
+}
+
+/**
+ * acpi_reserve_bootmem - do _very_ early ACPI initialisation
+ *
+ * We allocate a page in low memory for the wakeup
+ * routine for when we come back from a sleep state. The
+ * runtime allocator allows specification of <16M pages, but not
+ * <1M pages.
+ */
+void __init acpi_reserve_bootmem(void)
+{
+ acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
+ printk(KERN_DEBUG "ACPI: have wakeup address 0x%8.8lx\n", acpi_wakeup_address);
+}
+
+void do_suspend_lowlevel_s4bios(int resume)
+{
+ if (!resume) {
+ save_processor_context();
+ acpi_save_register_state((unsigned long)&&acpi_sleep_done);
+ acpi_enter_sleep_state_s4bios();
+ return;
+ }
+acpi_sleep_done:
+ restore_processor_context();
+}
+
+
+#endif /*CONFIG_ACPI_SLEEP*/
+
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