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-rw-r--r--arch/x86/kernel/mpparse_64.c852
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diff --git a/arch/x86/kernel/mpparse_64.c b/arch/x86/kernel/mpparse_64.c
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+/*
+ * Intel Multiprocessor Specification 1.1 and 1.4
+ * compliant MP-table parsing routines.
+ *
+ * (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
+ * (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
+ *
+ * Fixes
+ * Erich Boleyn : MP v1.4 and additional changes.
+ * Alan Cox : Added EBDA scanning
+ * Ingo Molnar : various cleanups and rewrites
+ * Maciej W. Rozycki: Bits for default MP configurations
+ * Paul Diefenbaugh: Added full ACPI support
+ */
+
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/bootmem.h>
+#include <linux/kernel_stat.h>
+#include <linux/mc146818rtc.h>
+#include <linux/acpi.h>
+#include <linux/module.h>
+
+#include <asm/smp.h>
+#include <asm/mtrr.h>
+#include <asm/mpspec.h>
+#include <asm/pgalloc.h>
+#include <asm/io_apic.h>
+#include <asm/proto.h>
+#include <asm/acpi.h>
+
+/* Have we found an MP table */
+int smp_found_config;
+
+/*
+ * Various Linux-internal data structures created from the
+ * MP-table.
+ */
+DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
+int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
+
+static int mp_current_pci_id = 0;
+/* I/O APIC entries */
+struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
+
+/* # of MP IRQ source entries */
+struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
+
+/* MP IRQ source entries */
+int mp_irq_entries;
+
+int nr_ioapics;
+unsigned long mp_lapic_addr = 0;
+
+
+
+/* Processor that is doing the boot up */
+unsigned int boot_cpu_id = -1U;
+/* Internal processor count */
+unsigned int num_processors __cpuinitdata = 0;
+
+unsigned disabled_cpus __cpuinitdata;
+
+/* Bitmask of physically existing CPUs */
+physid_mask_t phys_cpu_present_map = PHYSID_MASK_NONE;
+
+u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
+
+
+/*
+ * Intel MP BIOS table parsing routines:
+ */
+
+/*
+ * Checksum an MP configuration block.
+ */
+
+static int __init mpf_checksum(unsigned char *mp, int len)
+{
+ int sum = 0;
+
+ while (len--)
+ sum += *mp++;
+
+ return sum & 0xFF;
+}
+
+static void __cpuinit MP_processor_info (struct mpc_config_processor *m)
+{
+ int cpu;
+ cpumask_t tmp_map;
+ char *bootup_cpu = "";
+
+ if (!(m->mpc_cpuflag & CPU_ENABLED)) {
+ disabled_cpus++;
+ return;
+ }
+ if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
+ bootup_cpu = " (Bootup-CPU)";
+ boot_cpu_id = m->mpc_apicid;
+ }
+
+ printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
+
+ if (num_processors >= NR_CPUS) {
+ printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
+ " Processor ignored.\n", NR_CPUS);
+ return;
+ }
+
+ num_processors++;
+ cpus_complement(tmp_map, cpu_present_map);
+ cpu = first_cpu(tmp_map);
+
+ physid_set(m->mpc_apicid, phys_cpu_present_map);
+ if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
+ /*
+ * bios_cpu_apicid is required to have processors listed
+ * in same order as logical cpu numbers. Hence the first
+ * entry is BSP, and so on.
+ */
+ cpu = 0;
+ }
+ bios_cpu_apicid[cpu] = m->mpc_apicid;
+ x86_cpu_to_apicid[cpu] = m->mpc_apicid;
+
+ cpu_set(cpu, cpu_possible_map);
+ cpu_set(cpu, cpu_present_map);
+}
+
+static void __init MP_bus_info (struct mpc_config_bus *m)
+{
+ char str[7];
+
+ memcpy(str, m->mpc_bustype, 6);
+ str[6] = 0;
+ Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
+
+ if (strncmp(str, "ISA", 3) == 0) {
+ set_bit(m->mpc_busid, mp_bus_not_pci);
+ } else if (strncmp(str, "PCI", 3) == 0) {
+ clear_bit(m->mpc_busid, mp_bus_not_pci);
+ mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
+ mp_current_pci_id++;
+ } else {
+ printk(KERN_ERR "Unknown bustype %s\n", str);
+ }
+}
+
+static int bad_ioapic(unsigned long address)
+{
+ if (nr_ioapics >= MAX_IO_APICS) {
+ printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
+ "(found %d)\n", MAX_IO_APICS, nr_ioapics);
+ panic("Recompile kernel with bigger MAX_IO_APICS!\n");
+ }
+ if (!address) {
+ printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
+ " found in table, skipping!\n");
+ return 1;
+ }
+ return 0;
+}
+
+static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
+{
+ if (!(m->mpc_flags & MPC_APIC_USABLE))
+ return;
+
+ printk("I/O APIC #%d at 0x%X.\n",
+ m->mpc_apicid, m->mpc_apicaddr);
+
+ if (bad_ioapic(m->mpc_apicaddr))
+ return;
+
+ mp_ioapics[nr_ioapics] = *m;
+ nr_ioapics++;
+}
+
+static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
+{
+ mp_irqs [mp_irq_entries] = *m;
+ Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
+ " IRQ %02x, APIC ID %x, APIC INT %02x\n",
+ m->mpc_irqtype, m->mpc_irqflag & 3,
+ (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
+ m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
+ if (++mp_irq_entries >= MAX_IRQ_SOURCES)
+ panic("Max # of irq sources exceeded!!\n");
+}
+
+static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
+{
+ Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
+ " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
+ m->mpc_irqtype, m->mpc_irqflag & 3,
+ (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
+ m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
+}
+
+/*
+ * Read/parse the MPC
+ */
+
+static int __init smp_read_mpc(struct mp_config_table *mpc)
+{
+ char str[16];
+ int count=sizeof(*mpc);
+ unsigned char *mpt=((unsigned char *)mpc)+count;
+
+ if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
+ printk("MPTABLE: bad signature [%c%c%c%c]!\n",
+ mpc->mpc_signature[0],
+ mpc->mpc_signature[1],
+ mpc->mpc_signature[2],
+ mpc->mpc_signature[3]);
+ return 0;
+ }
+ if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
+ printk("MPTABLE: checksum error!\n");
+ return 0;
+ }
+ if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
+ printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
+ mpc->mpc_spec);
+ return 0;
+ }
+ if (!mpc->mpc_lapic) {
+ printk(KERN_ERR "MPTABLE: null local APIC address!\n");
+ return 0;
+ }
+ memcpy(str,mpc->mpc_oem,8);
+ str[8] = 0;
+ printk(KERN_INFO "MPTABLE: OEM ID: %s ",str);
+
+ memcpy(str,mpc->mpc_productid,12);
+ str[12] = 0;
+ printk("MPTABLE: Product ID: %s ",str);
+
+ printk("MPTABLE: APIC at: 0x%X\n",mpc->mpc_lapic);
+
+ /* save the local APIC address, it might be non-default */
+ if (!acpi_lapic)
+ mp_lapic_addr = mpc->mpc_lapic;
+
+ /*
+ * Now process the configuration blocks.
+ */
+ while (count < mpc->mpc_length) {
+ switch(*mpt) {
+ case MP_PROCESSOR:
+ {
+ struct mpc_config_processor *m=
+ (struct mpc_config_processor *)mpt;
+ if (!acpi_lapic)
+ MP_processor_info(m);
+ mpt += sizeof(*m);
+ count += sizeof(*m);
+ break;
+ }
+ case MP_BUS:
+ {
+ struct mpc_config_bus *m=
+ (struct mpc_config_bus *)mpt;
+ MP_bus_info(m);
+ mpt += sizeof(*m);
+ count += sizeof(*m);
+ break;
+ }
+ case MP_IOAPIC:
+ {
+ struct mpc_config_ioapic *m=
+ (struct mpc_config_ioapic *)mpt;
+ MP_ioapic_info(m);
+ mpt += sizeof(*m);
+ count += sizeof(*m);
+ break;
+ }
+ case MP_INTSRC:
+ {
+ struct mpc_config_intsrc *m=
+ (struct mpc_config_intsrc *)mpt;
+
+ MP_intsrc_info(m);
+ mpt += sizeof(*m);
+ count += sizeof(*m);
+ break;
+ }
+ case MP_LINTSRC:
+ {
+ struct mpc_config_lintsrc *m=
+ (struct mpc_config_lintsrc *)mpt;
+ MP_lintsrc_info(m);
+ mpt += sizeof(*m);
+ count += sizeof(*m);
+ break;
+ }
+ }
+ }
+ setup_apic_routing();
+ if (!num_processors)
+ printk(KERN_ERR "MPTABLE: no processors registered!\n");
+ return num_processors;
+}
+
+static int __init ELCR_trigger(unsigned int irq)
+{
+ unsigned int port;
+
+ port = 0x4d0 + (irq >> 3);
+ return (inb(port) >> (irq & 7)) & 1;
+}
+
+static void __init construct_default_ioirq_mptable(int mpc_default_type)
+{
+ struct mpc_config_intsrc intsrc;
+ int i;
+ int ELCR_fallback = 0;
+
+ intsrc.mpc_type = MP_INTSRC;
+ intsrc.mpc_irqflag = 0; /* conforming */
+ intsrc.mpc_srcbus = 0;
+ intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
+
+ intsrc.mpc_irqtype = mp_INT;
+
+ /*
+ * If true, we have an ISA/PCI system with no IRQ entries
+ * in the MP table. To prevent the PCI interrupts from being set up
+ * incorrectly, we try to use the ELCR. The sanity check to see if
+ * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
+ * never be level sensitive, so we simply see if the ELCR agrees.
+ * If it does, we assume it's valid.
+ */
+ if (mpc_default_type == 5) {
+ printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
+
+ if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
+ printk(KERN_ERR "ELCR contains invalid data... not using ELCR\n");
+ else {
+ printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
+ ELCR_fallback = 1;
+ }
+ }
+
+ for (i = 0; i < 16; i++) {
+ switch (mpc_default_type) {
+ case 2:
+ if (i == 0 || i == 13)
+ continue; /* IRQ0 & IRQ13 not connected */
+ /* fall through */
+ default:
+ if (i == 2)
+ continue; /* IRQ2 is never connected */
+ }
+
+ if (ELCR_fallback) {
+ /*
+ * If the ELCR indicates a level-sensitive interrupt, we
+ * copy that information over to the MP table in the
+ * irqflag field (level sensitive, active high polarity).
+ */
+ if (ELCR_trigger(i))
+ intsrc.mpc_irqflag = 13;
+ else
+ intsrc.mpc_irqflag = 0;
+ }
+
+ intsrc.mpc_srcbusirq = i;
+ intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
+ MP_intsrc_info(&intsrc);
+ }
+
+ intsrc.mpc_irqtype = mp_ExtINT;
+ intsrc.mpc_srcbusirq = 0;
+ intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
+ MP_intsrc_info(&intsrc);
+}
+
+static inline void __init construct_default_ISA_mptable(int mpc_default_type)
+{
+ struct mpc_config_processor processor;
+ struct mpc_config_bus bus;
+ struct mpc_config_ioapic ioapic;
+ struct mpc_config_lintsrc lintsrc;
+ int linttypes[2] = { mp_ExtINT, mp_NMI };
+ int i;
+
+ /*
+ * local APIC has default address
+ */
+ mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
+
+ /*
+ * 2 CPUs, numbered 0 & 1.
+ */
+ processor.mpc_type = MP_PROCESSOR;
+ processor.mpc_apicver = 0;
+ processor.mpc_cpuflag = CPU_ENABLED;
+ processor.mpc_cpufeature = 0;
+ processor.mpc_featureflag = 0;
+ processor.mpc_reserved[0] = 0;
+ processor.mpc_reserved[1] = 0;
+ for (i = 0; i < 2; i++) {
+ processor.mpc_apicid = i;
+ MP_processor_info(&processor);
+ }
+
+ bus.mpc_type = MP_BUS;
+ bus.mpc_busid = 0;
+ switch (mpc_default_type) {
+ default:
+ printk(KERN_ERR "???\nUnknown standard configuration %d\n",
+ mpc_default_type);
+ /* fall through */
+ case 1:
+ case 5:
+ memcpy(bus.mpc_bustype, "ISA ", 6);
+ break;
+ }
+ MP_bus_info(&bus);
+ if (mpc_default_type > 4) {
+ bus.mpc_busid = 1;
+ memcpy(bus.mpc_bustype, "PCI ", 6);
+ MP_bus_info(&bus);
+ }
+
+ ioapic.mpc_type = MP_IOAPIC;
+ ioapic.mpc_apicid = 2;
+ ioapic.mpc_apicver = 0;
+ ioapic.mpc_flags = MPC_APIC_USABLE;
+ ioapic.mpc_apicaddr = 0xFEC00000;
+ MP_ioapic_info(&ioapic);
+
+ /*
+ * We set up most of the low 16 IO-APIC pins according to MPS rules.
+ */
+ construct_default_ioirq_mptable(mpc_default_type);
+
+ lintsrc.mpc_type = MP_LINTSRC;
+ lintsrc.mpc_irqflag = 0; /* conforming */
+ lintsrc.mpc_srcbusid = 0;
+ lintsrc.mpc_srcbusirq = 0;
+ lintsrc.mpc_destapic = MP_APIC_ALL;
+ for (i = 0; i < 2; i++) {
+ lintsrc.mpc_irqtype = linttypes[i];
+ lintsrc.mpc_destapiclint = i;
+ MP_lintsrc_info(&lintsrc);
+ }
+}
+
+static struct intel_mp_floating *mpf_found;
+
+/*
+ * Scan the memory blocks for an SMP configuration block.
+ */
+void __init get_smp_config (void)
+{
+ struct intel_mp_floating *mpf = mpf_found;
+
+ /*
+ * ACPI supports both logical (e.g. Hyper-Threading) and physical
+ * processors, where MPS only supports physical.
+ */
+ if (acpi_lapic && acpi_ioapic) {
+ printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
+ return;
+ }
+ else if (acpi_lapic)
+ printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
+
+ printk("Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
+
+ /*
+ * Now see if we need to read further.
+ */
+ if (mpf->mpf_feature1 != 0) {
+
+ printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
+ construct_default_ISA_mptable(mpf->mpf_feature1);
+
+ } else if (mpf->mpf_physptr) {
+
+ /*
+ * Read the physical hardware table. Anything here will
+ * override the defaults.
+ */
+ if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr))) {
+ smp_found_config = 0;
+ printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
+ printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
+ return;
+ }
+ /*
+ * If there are no explicit MP IRQ entries, then we are
+ * broken. We set up most of the low 16 IO-APIC pins to
+ * ISA defaults and hope it will work.
+ */
+ if (!mp_irq_entries) {
+ struct mpc_config_bus bus;
+
+ printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
+
+ bus.mpc_type = MP_BUS;
+ bus.mpc_busid = 0;
+ memcpy(bus.mpc_bustype, "ISA ", 6);
+ MP_bus_info(&bus);
+
+ construct_default_ioirq_mptable(0);
+ }
+
+ } else
+ BUG();
+
+ printk(KERN_INFO "Processors: %d\n", num_processors);
+ /*
+ * Only use the first configuration found.
+ */
+}
+
+static int __init smp_scan_config (unsigned long base, unsigned long length)
+{
+ extern void __bad_mpf_size(void);
+ unsigned int *bp = phys_to_virt(base);
+ struct intel_mp_floating *mpf;
+
+ Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
+ if (sizeof(*mpf) != 16)
+ __bad_mpf_size();
+
+ while (length > 0) {
+ mpf = (struct intel_mp_floating *)bp;
+ if ((*bp == SMP_MAGIC_IDENT) &&
+ (mpf->mpf_length == 1) &&
+ !mpf_checksum((unsigned char *)bp, 16) &&
+ ((mpf->mpf_specification == 1)
+ || (mpf->mpf_specification == 4)) ) {
+
+ smp_found_config = 1;
+ reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
+ if (mpf->mpf_physptr)
+ reserve_bootmem_generic(mpf->mpf_physptr, PAGE_SIZE);
+ mpf_found = mpf;
+ return 1;
+ }
+ bp += 4;
+ length -= 16;
+ }
+ return 0;
+}
+
+void __init find_smp_config(void)
+{
+ unsigned int address;
+
+ /*
+ * FIXME: Linux assumes you have 640K of base ram..
+ * this continues the error...
+ *
+ * 1) Scan the bottom 1K for a signature
+ * 2) Scan the top 1K of base RAM
+ * 3) Scan the 64K of bios
+ */
+ if (smp_scan_config(0x0,0x400) ||
+ smp_scan_config(639*0x400,0x400) ||
+ smp_scan_config(0xF0000,0x10000))
+ return;
+ /*
+ * If it is an SMP machine we should know now.
+ *
+ * there is a real-mode segmented pointer pointing to the
+ * 4K EBDA area at 0x40E, calculate and scan it here.
+ *
+ * NOTE! There are Linux loaders that will corrupt the EBDA
+ * area, and as such this kind of SMP config may be less
+ * trustworthy, simply because the SMP table may have been
+ * stomped on during early boot. These loaders are buggy and
+ * should be fixed.
+ */
+
+ address = *(unsigned short *)phys_to_virt(0x40E);
+ address <<= 4;
+ if (smp_scan_config(address, 0x1000))
+ return;
+
+ /* If we have come this far, we did not find an MP table */
+ printk(KERN_INFO "No mptable found.\n");
+}
+
+/* --------------------------------------------------------------------------
+ ACPI-based MP Configuration
+ -------------------------------------------------------------------------- */
+
+#ifdef CONFIG_ACPI
+
+void __init mp_register_lapic_address(u64 address)
+{
+ mp_lapic_addr = (unsigned long) address;
+ set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
+ if (boot_cpu_id == -1U)
+ boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
+}
+
+void __cpuinit mp_register_lapic (u8 id, u8 enabled)
+{
+ struct mpc_config_processor processor;
+ int boot_cpu = 0;
+
+ if (id == boot_cpu_id)
+ boot_cpu = 1;
+
+ processor.mpc_type = MP_PROCESSOR;
+ processor.mpc_apicid = id;
+ processor.mpc_apicver = 0;
+ processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
+ processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
+ processor.mpc_cpufeature = 0;
+ processor.mpc_featureflag = 0;
+ processor.mpc_reserved[0] = 0;
+ processor.mpc_reserved[1] = 0;
+
+ MP_processor_info(&processor);
+}
+
+#define MP_ISA_BUS 0
+#define MP_MAX_IOAPIC_PIN 127
+
+static struct mp_ioapic_routing {
+ int apic_id;
+ int gsi_start;
+ int gsi_end;
+ u32 pin_programmed[4];
+} mp_ioapic_routing[MAX_IO_APICS];
+
+static int mp_find_ioapic(int gsi)
+{
+ int i = 0;
+
+ /* Find the IOAPIC that manages this GSI. */
+ for (i = 0; i < nr_ioapics; i++) {
+ if ((gsi >= mp_ioapic_routing[i].gsi_start)
+ && (gsi <= mp_ioapic_routing[i].gsi_end))
+ return i;
+ }
+
+ printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
+ return -1;
+}
+
+static u8 uniq_ioapic_id(u8 id)
+{
+ int i;
+ DECLARE_BITMAP(used, 256);
+ bitmap_zero(used, 256);
+ for (i = 0; i < nr_ioapics; i++) {
+ struct mpc_config_ioapic *ia = &mp_ioapics[i];
+ __set_bit(ia->mpc_apicid, used);
+ }
+ if (!test_bit(id, used))
+ return id;
+ return find_first_zero_bit(used, 256);
+}
+
+void __init mp_register_ioapic(u8 id, u32 address, u32 gsi_base)
+{
+ int idx = 0;
+
+ if (bad_ioapic(address))
+ return;
+
+ idx = nr_ioapics;
+
+ mp_ioapics[idx].mpc_type = MP_IOAPIC;
+ mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
+ mp_ioapics[idx].mpc_apicaddr = address;
+
+ set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
+ mp_ioapics[idx].mpc_apicid = uniq_ioapic_id(id);
+ mp_ioapics[idx].mpc_apicver = 0;
+
+ /*
+ * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
+ * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
+ */
+ mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
+ mp_ioapic_routing[idx].gsi_start = gsi_base;
+ mp_ioapic_routing[idx].gsi_end = gsi_base +
+ io_apic_get_redir_entries(idx);
+
+ printk(KERN_INFO "IOAPIC[%d]: apic_id %d, address 0x%x, "
+ "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
+ mp_ioapics[idx].mpc_apicaddr,
+ mp_ioapic_routing[idx].gsi_start,
+ mp_ioapic_routing[idx].gsi_end);
+
+ nr_ioapics++;
+}
+
+void __init
+mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
+{
+ struct mpc_config_intsrc intsrc;
+ int ioapic = -1;
+ int pin = -1;
+
+ /*
+ * Convert 'gsi' to 'ioapic.pin'.
+ */
+ ioapic = mp_find_ioapic(gsi);
+ if (ioapic < 0)
+ return;
+ pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
+
+ /*
+ * TBD: This check is for faulty timer entries, where the override
+ * erroneously sets the trigger to level, resulting in a HUGE
+ * increase of timer interrupts!
+ */
+ if ((bus_irq == 0) && (trigger == 3))
+ trigger = 1;
+
+ intsrc.mpc_type = MP_INTSRC;
+ intsrc.mpc_irqtype = mp_INT;
+ intsrc.mpc_irqflag = (trigger << 2) | polarity;
+ intsrc.mpc_srcbus = MP_ISA_BUS;
+ intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
+ intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
+ intsrc.mpc_dstirq = pin; /* INTIN# */
+
+ Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
+ intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
+ (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
+ intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
+
+ mp_irqs[mp_irq_entries] = intsrc;
+ if (++mp_irq_entries == MAX_IRQ_SOURCES)
+ panic("Max # of irq sources exceeded!\n");
+}
+
+void __init mp_config_acpi_legacy_irqs(void)
+{
+ struct mpc_config_intsrc intsrc;
+ int i = 0;
+ int ioapic = -1;
+
+ /*
+ * Fabricate the legacy ISA bus (bus #31).
+ */
+ set_bit(MP_ISA_BUS, mp_bus_not_pci);
+
+ /*
+ * Locate the IOAPIC that manages the ISA IRQs (0-15).
+ */
+ ioapic = mp_find_ioapic(0);
+ if (ioapic < 0)
+ return;
+
+ intsrc.mpc_type = MP_INTSRC;
+ intsrc.mpc_irqflag = 0; /* Conforming */
+ intsrc.mpc_srcbus = MP_ISA_BUS;
+ intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
+
+ /*
+ * Use the default configuration for the IRQs 0-15. Unless
+ * overridden by (MADT) interrupt source override entries.
+ */
+ for (i = 0; i < 16; i++) {
+ int idx;
+
+ for (idx = 0; idx < mp_irq_entries; idx++) {
+ struct mpc_config_intsrc *irq = mp_irqs + idx;
+
+ /* Do we already have a mapping for this ISA IRQ? */
+ if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
+ break;
+
+ /* Do we already have a mapping for this IOAPIC pin */
+ if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
+ (irq->mpc_dstirq == i))
+ break;
+ }
+
+ if (idx != mp_irq_entries) {
+ printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
+ continue; /* IRQ already used */
+ }
+
+ intsrc.mpc_irqtype = mp_INT;
+ intsrc.mpc_srcbusirq = i; /* Identity mapped */
+ intsrc.mpc_dstirq = i;
+
+ Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
+ "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
+ (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
+ intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
+ intsrc.mpc_dstirq);
+
+ mp_irqs[mp_irq_entries] = intsrc;
+ if (++mp_irq_entries == MAX_IRQ_SOURCES)
+ panic("Max # of irq sources exceeded!\n");
+ }
+}
+
+int mp_register_gsi(u32 gsi, int triggering, int polarity)
+{
+ int ioapic = -1;
+ int ioapic_pin = 0;
+ int idx, bit = 0;
+
+ if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
+ return gsi;
+
+ /* Don't set up the ACPI SCI because it's already set up */
+ if (acpi_gbl_FADT.sci_interrupt == gsi)
+ return gsi;
+
+ ioapic = mp_find_ioapic(gsi);
+ if (ioapic < 0) {
+ printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
+ return gsi;
+ }
+
+ ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
+
+ /*
+ * Avoid pin reprogramming. PRTs typically include entries
+ * with redundant pin->gsi mappings (but unique PCI devices);
+ * we only program the IOAPIC on the first.
+ */
+ bit = ioapic_pin % 32;
+ idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
+ if (idx > 3) {
+ printk(KERN_ERR "Invalid reference to IOAPIC pin "
+ "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
+ ioapic_pin);
+ return gsi;
+ }
+ if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
+ Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
+ mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
+ return gsi;
+ }
+
+ mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
+
+ io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
+ triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
+ polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
+ return gsi;
+}
+#endif /*CONFIG_ACPI*/
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 13:32:41 +0000