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googlers / maze / linux / 3e5b787ac38575c88ceb20619bcda09cb4c17d8b / . / arch / x86 / kernel / mpparse.c
blob: 404683b94e79592c69e04930ed385056f8f5861c [file] [log] [blame]
/*
* 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>
* (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
*/
#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/bitops.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>
#include <asm/bios_ebda.h>
#include <mach_apic.h>
#ifdef CONFIG_X86_32
#include <mach_apicdef.h>
#include <mach_mpparse.h>
#endif
/* Have we found an MP table */
int smp_found_config;
/*
* Various Linux-internal data structures created from the
* MP-table.
*/
#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
int mp_bus_id_to_type[MAX_MP_BUSSES];
#endif
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;
int pic_mode;
/*
* 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;
}
#ifdef CONFIG_X86_NUMAQ
/*
* Have to match translation table entries to main table entries by counter
* hence the mpc_record variable .... can't see a less disgusting way of
* doing this ....
*/
static int mpc_record;
static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY]
__cpuinitdata;
#endif
static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
{
int apicid;
char *bootup_cpu = "";
if (!(m->mpc_cpuflag & CPU_ENABLED)) {
disabled_cpus++;
return;
}
#ifdef CONFIG_X86_NUMAQ
apicid = mpc_apic_id(m, translation_table[mpc_record]);
#else
apicid = m->mpc_apicid;
#endif
if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
bootup_cpu = " (Bootup-CPU)";
boot_cpu_physical_apicid = m->mpc_apicid;
}
printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
generic_processor_info(apicid, m->mpc_apicver);
}
static void __init MP_bus_info(struct mpc_config_bus *m)
{
char str[7];
memcpy(str, m->mpc_bustype, 6);
str[6] = 0;
#ifdef CONFIG_X86_NUMAQ
mpc_oem_bus_info(m, str, translation_table[mpc_record]);
#else
Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
#endif
#if MAX_MP_BUSSES < 256
if (m->mpc_busid >= MAX_MP_BUSSES) {
printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
" is too large, max. supported is %d\n",
m->mpc_busid, str, MAX_MP_BUSSES - 1);
return;
}
#endif
if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
set_bit(m->mpc_busid, mp_bus_not_pci);
#if defined(CONFIG_EISA) || defined (CONFIG_MCA)
mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
#endif
} else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
#ifdef CONFIG_X86_NUMAQ
mpc_oem_pci_bus(m, translation_table[mpc_record]);
#endif
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++;
#if defined(CONFIG_EISA) || defined (CONFIG_MCA)
mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
} else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
} else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
#endif
} else
printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
}
#ifdef CONFIG_X86_IO_APIC
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(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
m->mpc_apicid, m->mpc_apicver, 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");
}
#endif
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);
}
#ifdef CONFIG_X86_NUMAQ
static void __init MP_translation_info(struct mpc_config_translation *m)
{
printk(KERN_INFO
"Translation: record %d, type %d, quad %d, global %d, local %d\n",
mpc_record, m->trans_type, m->trans_quad, m->trans_global,
m->trans_local);
if (mpc_record >= MAX_MPC_ENTRY)
printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
else
translation_table[mpc_record] = m; /* stash this for later */
if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
node_set_online(m->trans_quad);
}
/*
* Read/parse the MPC oem tables
*/
static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable,
unsigned short oemsize)
{
int count = sizeof(*oemtable); /* the header size */
unsigned char *oemptr = ((unsigned char *)oemtable) + count;
mpc_record = 0;
printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n",
oemtable);
if (memcmp(oemtable->oem_signature, MPC_OEM_SIGNATURE, 4)) {
printk(KERN_WARNING
"SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
oemtable->oem_signature[0], oemtable->oem_signature[1],
oemtable->oem_signature[2], oemtable->oem_signature[3]);
return;
}
if (mpf_checksum((unsigned char *)oemtable, oemtable->oem_length)) {
printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
return;
}
while (count < oemtable->oem_length) {
switch (*oemptr) {
case MP_TRANSLATION:
{
struct mpc_config_translation *m =
(struct mpc_config_translation *)oemptr;
MP_translation_info(m);
oemptr += sizeof(*m);
count += sizeof(*m);
++mpc_record;
break;
}
default:
{
printk(KERN_WARNING
"Unrecognised OEM table entry type! - %d\n",
(int)*oemptr);
return;
}
}
}
}
static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
char *productid)
{
if (strncmp(oem, "IBM NUMA", 8))
printk("Warning! May not be a NUMA-Q system!\n");
if (mpc->mpc_oemptr)
smp_read_mpc_oem((struct mp_config_oemtable *)mpc->mpc_oemptr,
mpc->mpc_oemsize);
}
#endif /* CONFIG_X86_NUMAQ */
/*
* Read/parse the MPC
*/
static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
{
char str[16];
char oem[10];
int count = sizeof(*mpc);
unsigned char *mpt = ((unsigned char *)mpc) + count;
if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
printk(KERN_ERR "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(KERN_ERR "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(oem, mpc->mpc_oem, 8);
oem[8] = 0;
printk(KERN_INFO "MPTABLE: OEM ID: %s ", oem);
memcpy(str, mpc->mpc_productid, 12);
str[12] = 0;
printk("Product ID: %s ", str);
#ifdef CONFIG_X86_32
mps_oem_check(mpc, oem, str);
#endif
printk(KERN_INFO "MPTABLE: Product ID: %s ", str);
printk(KERN_INFO "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;
if (early)
return 1;
/*
* Now process the configuration blocks.
*/
#ifdef CONFIG_X86_NUMAQ
mpc_record = 0;
#endif
while (count < mpc->mpc_length) {
switch (*mpt) {
case MP_PROCESSOR:
{
struct mpc_config_processor *m =
(struct mpc_config_processor *)mpt;
/* ACPI may have already provided this data */
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:
{
#ifdef CONFIG_X86_IO_APIC
struct mpc_config_ioapic *m =
(struct mpc_config_ioapic *)mpt;
MP_ioapic_info(m);
#endif
mpt += sizeof(struct mpc_config_ioapic);
count += sizeof(struct mpc_config_ioapic);
break;
}
case MP_INTSRC:
{
#ifdef CONFIG_X86_IO_APIC
struct mpc_config_intsrc *m =
(struct mpc_config_intsrc *)mpt;
MP_intsrc_info(m);
#endif
mpt += sizeof(struct mpc_config_intsrc);
count += sizeof(struct mpc_config_intsrc);
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;
}
default:
/* wrong mptable */
printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
printk(KERN_ERR "type %x\n", *mpt);
print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
1, mpc, mpc->mpc_length, 1);
count = mpc->mpc_length;
break;
}
#ifdef CONFIG_X86_NUMAQ
++mpc_record;
#endif
}
setup_apic_routing();
if (!num_processors)
printk(KERN_ERR "MPTABLE: no processors registered!\n");
return num_processors;
}
#ifdef CONFIG_X86_IO_APIC
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);
}
#endif
static inline void __init construct_default_ISA_mptable(int mpc_default_type)
{
struct mpc_config_processor processor;
struct mpc_config_bus bus;
#ifdef CONFIG_X86_IO_APIC
struct mpc_config_ioapic ioapic;
#endif
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;
/* Either an integrated APIC or a discrete 82489DX. */
processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
processor.mpc_cpuflag = CPU_ENABLED;
processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
(boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
processor.mpc_featureflag = boot_cpu_data.x86_capability[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;
case 2:
case 6:
case 3:
memcpy(bus.mpc_bustype, "EISA ", 6);
break;
case 4:
case 7:
memcpy(bus.mpc_bustype, "MCA ", 6);
}
MP_bus_info(&bus);
if (mpc_default_type > 4) {
bus.mpc_busid = 1;
memcpy(bus.mpc_bustype, "PCI ", 6);
MP_bus_info(&bus);
}
#ifdef CONFIG_X86_IO_APIC
ioapic.mpc_type = MP_IOAPIC;
ioapic.mpc_apicid = 2;
ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
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);
#endif
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.
*/
static void __init __get_smp_config(unsigned early)
{
struct intel_mp_floating *mpf = mpf_found;
if (acpi_lapic && early)
return;
/*
* 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(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
mpf->mpf_specification);
#ifdef CONFIG_X86_32
if (mpf->mpf_feature2 & (1 << 7)) {
printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
pic_mode = 1;
} else {
printk(KERN_INFO " Virtual Wire compatibility mode.\n");
pic_mode = 0;
}
#endif
/*
* Now see if we need to read further.
*/
if (mpf->mpf_feature1 != 0) {
if (early) {
/*
* local APIC has default address
*/
mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
return;
}
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), early)) {
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 (early)
return;
#ifdef CONFIG_X86_IO_APIC
/*
* 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);
}
#endif
} else
BUG();
if (!early)
printk(KERN_INFO "Processors: %d\n", num_processors);
/*
* Only use the first configuration found.
*/
}
void __init early_get_smp_config(void)
{
__get_smp_config(1);
}
void __init get_smp_config(void)
{
__get_smp_config(0);
}
static int __init smp_scan_config(unsigned long base, unsigned long length,
unsigned reserve)
{
unsigned int *bp = phys_to_virt(base);
struct intel_mp_floating *mpf;
Dprintk("Scan SMP from %p for %ld bytes.\n", bp, length);
BUILD_BUG_ON(sizeof(*mpf) != 16);
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;
mpf_found = mpf;
#ifdef CONFIG_X86_32
printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
mpf, virt_to_phys(mpf));
reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE,
BOOTMEM_DEFAULT);
if (mpf->mpf_physptr) {
/*
* We cannot access to MPC table to compute
* table size yet, as only few megabytes from
* the bottom is mapped now.
* PC-9800's MPC table places on the very last
* of physical memory; so that simply reserving
* PAGE_SIZE from mpg->mpf_physptr yields BUG()
* in reserve_bootmem.
*/
unsigned long size = PAGE_SIZE;
unsigned long end = max_low_pfn * PAGE_SIZE;
if (mpf->mpf_physptr + size > end)
size = end - mpf->mpf_physptr;
reserve_bootmem(mpf->mpf_physptr, size,
BOOTMEM_DEFAULT);
}
#else
if (!reserve)
return 1;
reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
if (mpf->mpf_physptr)
reserve_bootmem_generic(mpf->mpf_physptr,
PAGE_SIZE);
#endif
return 1;
}
bp += 4;
length -= 16;
}
return 0;
}
static void __init __find_smp_config(unsigned reserve)
{
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, reserve) ||
smp_scan_config(639 * 0x400, 0x400, reserve) ||
smp_scan_config(0xF0000, 0x10000, reserve))
return;
/*
* If it is an SMP machine we should know now, unless the
* configuration is in an EISA/MCA bus machine with an
* extended bios data area.
*
* 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.
*
* MP1.4 SPEC states to only scan first 1K of 4K EBDA.
*/
address = get_bios_ebda();
if (address)
smp_scan_config(address, 0x400, reserve);
}
void __init early_find_smp_config(void)
{
__find_smp_config(0);
}
void __init find_smp_config(void)
{
__find_smp_config(1);
}
/* --------------------------------------------------------------------------
ACPI-based MP Configuration
-------------------------------------------------------------------------- */
/*
* Keep this outside and initialized to 0, for !CONFIG_ACPI builds:
*/
int es7000_plat;
#ifdef CONFIG_ACPI
#ifdef CONFIG_X86_IO_APIC
#define MP_ISA_BUS 0
extern struct mp_ioapic_routing 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_base)
&& (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 __init uniq_ioapic_id(u8 id)
{
#ifdef CONFIG_X86_32
if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
!APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
return io_apic_get_unique_id(nr_ioapics, id);
else
return id;
#else
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);
#endif
}
void __init mp_register_ioapic(int 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);
#ifdef CONFIG_X86_32
mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
#else
mp_ioapics[idx].mpc_apicver = 0;
#endif
/*
* Build basic GSI lookup table to facilitate gsi->io_apic lookups
* and to prevent reprogramming of IOAPIC pins (PCI GSIs).
*/
mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
mp_ioapic_routing[idx].gsi_base = gsi_base;
mp_ioapic_routing[idx].gsi_end = gsi_base +
io_apic_get_redir_entries(idx);
printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
"GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
mp_ioapic_routing[idx].gsi_base, 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_base;
/*
* 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# */
MP_intsrc_info(&intsrc);
}
void __init mp_config_acpi_legacy_irqs(void)
{
struct mpc_config_intsrc intsrc;
int i = 0;
int ioapic = -1;
#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
/*
* Fabricate the legacy ISA bus (bus #31).
*/
mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
#endif
set_bit(MP_ISA_BUS, mp_bus_not_pci);
Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
/*
* Older generations of ES7000 have no legacy identity mappings
*/
if (es7000_plat == 1)
return;
/*
* 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;
#ifdef CONFIG_X86_IO_APIC
intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
#endif
/*
* 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;
MP_intsrc_info(&intsrc);
}
}
int mp_register_gsi(u32 gsi, int triggering, int polarity)
{
int ioapic;
int ioapic_pin;
#ifdef CONFIG_X86_32
#define MAX_GSI_NUM 4096
#define IRQ_COMPRESSION_START 64
static int pci_irq = IRQ_COMPRESSION_START;
/*
* Mapping between Global System Interrupts, which
* represent all possible interrupts, and IRQs
* assigned to actual devices.
*/
static int gsi_to_irq[MAX_GSI_NUM];
#else
if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
return gsi;
#endif
/* 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_base;
#ifdef CONFIG_X86_32
if (ioapic_renumber_irq)
gsi = ioapic_renumber_irq(ioapic, gsi);
#endif
/*
* Avoid pin reprogramming. PRTs typically include entries
* with redundant pin->gsi mappings (but unique PCI devices);
* we only program the IOAPIC on the first.
*/
if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
printk(KERN_ERR "Invalid reference to IOAPIC pin "
"%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
ioapic_pin);
return gsi;
}
if (test_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed)) {
Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
#ifdef CONFIG_X86_32
return (gsi < IRQ_COMPRESSION_START ? gsi : gsi_to_irq[gsi]);
#else
return gsi;
#endif
}
set_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed);
#ifdef CONFIG_X86_32
/*
* For GSI >= 64, use IRQ compression
*/
if ((gsi >= IRQ_COMPRESSION_START)
&& (triggering == ACPI_LEVEL_SENSITIVE)) {
/*
* For PCI devices assign IRQs in order, avoiding gaps
* due to unused I/O APIC pins.
*/
int irq = gsi;
if (gsi < MAX_GSI_NUM) {
/*
* Retain the VIA chipset work-around (gsi > 15), but
* avoid a problem where the 8254 timer (IRQ0) is setup
* via an override (so it's not on pin 0 of the ioapic),
* and at the same time, the pin 0 interrupt is a PCI
* type. The gsi > 15 test could cause these two pins
* to be shared as IRQ0, and they are not shareable.
* So test for this condition, and if necessary, avoid
* the pin collision.
*/
gsi = pci_irq++;
/*
* Don't assign IRQ used by ACPI SCI
*/
if (gsi == acpi_gbl_FADT.sci_interrupt)
gsi = pci_irq++;
gsi_to_irq[irq] = gsi;
} else {
printk(KERN_ERR "GSI %u is too high\n", gsi);
return gsi;
}
}
#endif
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_X86_IO_APIC */
#endif /* CONFIG_ACPI */