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linux/arch/x86/kernel/mpparse.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>
* (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 <asm/e820.h>
#include <asm/trampoline.h>
#include <mach_apic.h>
#ifdef CONFIG_X86_32
#include <mach_apicdef.h>
#include <mach_mpparse.h>
#endif
/*
* 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
if (found_numaq)
apicid = mpc_apic_id(m, translation_table[mpc_record]);
else
apicid = m->mpc_apicid;
#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);
}
#ifdef CONFIG_X86_IO_APIC
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
if (found_numaq)
mpc_oem_bus_info(m, str, translation_table[mpc_record]);
#else
printk(KERN_INFO "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
if (found_numaq)
mpc_oem_pci_bus(m, translation_table[mpc_record]);
#endif
clear_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_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);
}
#endif
#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].mp_apicaddr = m->mpc_apicaddr;
mp_ioapics[nr_ioapics].mp_apicid = m->mpc_apicid;
mp_ioapics[nr_ioapics].mp_type = m->mpc_type;
mp_ioapics[nr_ioapics].mp_apicver = m->mpc_apicver;
mp_ioapics[nr_ioapics].mp_flags = m->mpc_flags;
nr_ioapics++;
}
static void print_MP_intsrc_info(struct mpc_config_intsrc *m)
{
printk(KERN_CONT "Int: type %d, pol %d, trig %d, bus %02x,"
" 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);
}
static void __init print_mp_irq_info(struct mp_config_intsrc *mp_irq)
{
printk(KERN_CONT "Int: type %d, pol %d, trig %d, bus %02x,"
" IRQ %02x, APIC ID %x, APIC INT %02x\n",
mp_irq->mp_irqtype, mp_irq->mp_irqflag & 3,
(mp_irq->mp_irqflag >> 2) & 3, mp_irq->mp_srcbus,
mp_irq->mp_srcbusirq, mp_irq->mp_dstapic, mp_irq->mp_dstirq);
}
static void assign_to_mp_irq(struct mpc_config_intsrc *m,
struct mp_config_intsrc *mp_irq)
{
mp_irq->mp_dstapic = m->mpc_dstapic;
mp_irq->mp_type = m->mpc_type;
mp_irq->mp_irqtype = m->mpc_irqtype;
mp_irq->mp_irqflag = m->mpc_irqflag;
mp_irq->mp_srcbus = m->mpc_srcbus;
mp_irq->mp_srcbusirq = m->mpc_srcbusirq;
mp_irq->mp_dstirq = m->mpc_dstirq;
}
static void __init assign_to_mpc_intsrc(struct mp_config_intsrc *mp_irq,
struct mpc_config_intsrc *m)
{
m->mpc_dstapic = mp_irq->mp_dstapic;
m->mpc_type = mp_irq->mp_type;
m->mpc_irqtype = mp_irq->mp_irqtype;
m->mpc_irqflag = mp_irq->mp_irqflag;
m->mpc_srcbus = mp_irq->mp_srcbus;
m->mpc_srcbusirq = mp_irq->mp_srcbusirq;
m->mpc_dstirq = mp_irq->mp_dstirq;
}
static int mp_irq_mpc_intsrc_cmp(struct mp_config_intsrc *mp_irq,
struct mpc_config_intsrc *m)
{
if (mp_irq->mp_dstapic != m->mpc_dstapic)
return 1;
if (mp_irq->mp_type != m->mpc_type)
return 2;
if (mp_irq->mp_irqtype != m->mpc_irqtype)
return 3;
if (mp_irq->mp_irqflag != m->mpc_irqflag)
return 4;
if (mp_irq->mp_srcbus != m->mpc_srcbus)
return 5;
if (mp_irq->mp_srcbusirq != m->mpc_srcbusirq)
return 6;
if (mp_irq->mp_dstirq != m->mpc_dstirq)
return 7;
return 0;
}
void MP_intsrc_info(struct mpc_config_intsrc *m)
{
int i;
print_MP_intsrc_info(m);
for (i = 0; i < mp_irq_entries; i++) {
if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
return;
}
assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
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)
{
printk(KERN_INFO "Lint: type %d, pol %d, trig %d, bus %02x,"
" 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");
else
found_numaq = 1;
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_check_mpc(struct mp_config_table *mpc, char *oem,
char *str)
{
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\n", oem);
memcpy(str, mpc->mpc_productid, 12);
str[12] = 0;
printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
return 1;
}
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 (!smp_check_mpc(mpc, oem, str))
return 0;
#ifdef CONFIG_X86_32
mps_oem_check(mpc, oem, str);
#endif
/* 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;
#ifdef CONFIG_X86_IO_APIC
MP_bus_info(m);
#endif
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].mp_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 void construct_ioapic_table(int mpc_default_type)
{
struct mpc_config_ioapic ioapic;
struct mpc_config_bus bus;
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);
}
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);
}
#else
static inline void construct_ioapic_table(int mpc_default_type) { }
#endif
static inline void __init construct_default_ISA_mptable(int mpc_default_type)
{
struct mpc_config_processor processor;
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);
}
construct_ioapic_table(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.
*/
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);
#if defined(CONFIG_X86_LOCAL_APIC) && defined(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)) {
#ifdef CONFIG_X86_LOCAL_APIC
smp_found_config = 0;
#endif
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;
printk(KERN_DEBUG "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))) {
#ifdef CONFIG_X86_LOCAL_APIC
smp_found_config = 1;
#endif
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);
}
#ifdef CONFIG_X86_IO_APIC
static u8 __initdata irq_used[MAX_IRQ_SOURCES];
static int __init get_MP_intsrc_index(struct mpc_config_intsrc *m)
{
int i;
if (m->mpc_irqtype != mp_INT)
return 0;
if (m->mpc_irqflag != 0x0f)
return 0;
/* not legacy */
for (i = 0; i < mp_irq_entries; i++) {
if (mp_irqs[i].mp_irqtype != mp_INT)
continue;
if (mp_irqs[i].mp_irqflag != 0x0f)
continue;
if (mp_irqs[i].mp_srcbus != m->mpc_srcbus)
continue;
if (mp_irqs[i].mp_srcbusirq != m->mpc_srcbusirq)
continue;
if (irq_used[i]) {
/* already claimed */
return -2;
}
irq_used[i] = 1;
return i;
}
/* not found */
return -1;
}
#define SPARE_SLOT_NUM 20
static struct mpc_config_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
#endif
static int __init replace_intsrc_all(struct mp_config_table *mpc,
unsigned long mpc_new_phys,
unsigned long mpc_new_length)
{
#ifdef CONFIG_X86_IO_APIC
int i;
int nr_m_spare = 0;
#endif
int count = sizeof(*mpc);
unsigned char *mpt = ((unsigned char *)mpc) + count;
printk(KERN_INFO "mpc_length %x\n", mpc->mpc_length);
while (count < mpc->mpc_length) {
switch (*mpt) {
case MP_PROCESSOR:
{
struct mpc_config_processor *m =
(struct mpc_config_processor *)mpt;
mpt += sizeof(*m);
count += sizeof(*m);
break;
}
case MP_BUS:
{
struct mpc_config_bus *m =
(struct mpc_config_bus *)mpt;
mpt += sizeof(*m);
count += sizeof(*m);
break;
}
case MP_IOAPIC:
{
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;
printk(KERN_INFO "OLD ");
print_MP_intsrc_info(m);
i = get_MP_intsrc_index(m);
if (i > 0) {
assign_to_mpc_intsrc(&mp_irqs[i], m);
printk(KERN_INFO "NEW ");
print_mp_irq_info(&mp_irqs[i]);
} else if (!i) {
/* legacy, do nothing */
} else if (nr_m_spare < SPARE_SLOT_NUM) {
/*
* not found (-1), or duplicated (-2)
* are invalid entries,
* we need to use the slot later
*/
m_spare[nr_m_spare] = m;
nr_m_spare++;
}
#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;
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);
goto out;
}
}
#ifdef CONFIG_X86_IO_APIC
for (i = 0; i < mp_irq_entries; i++) {
if (irq_used[i])
continue;
if (mp_irqs[i].mp_irqtype != mp_INT)
continue;
if (mp_irqs[i].mp_irqflag != 0x0f)
continue;
if (nr_m_spare > 0) {
printk(KERN_INFO "*NEW* found ");
nr_m_spare--;
assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
m_spare[nr_m_spare] = NULL;
} else {
struct mpc_config_intsrc *m =
(struct mpc_config_intsrc *)mpt;
count += sizeof(struct mpc_config_intsrc);
if (!mpc_new_phys) {
printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
} else {
if (count <= mpc_new_length)
printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
else {
printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
goto out;
}
}
assign_to_mpc_intsrc(&mp_irqs[i], m);
mpc->mpc_length = count;
mpt += sizeof(struct mpc_config_intsrc);
}
print_mp_irq_info(&mp_irqs[i]);
}
#endif
out:
/* update checksum */
mpc->mpc_checksum = 0;
mpc->mpc_checksum -= mpf_checksum((unsigned char *)mpc,
mpc->mpc_length);
return 0;
}
int __initdata enable_update_mptable;
static int __init update_mptable_setup(char *str)
{
enable_update_mptable = 1;
return 0;
}
early_param("update_mptable", update_mptable_setup);
static unsigned long __initdata mpc_new_phys;
static unsigned long mpc_new_length __initdata = 4096;
/* alloc_mptable or alloc_mptable=4k */
static int __initdata alloc_mptable;
static int __init parse_alloc_mptable_opt(char *p)
{
enable_update_mptable = 1;
alloc_mptable = 1;
if (!p)
return 0;
mpc_new_length = memparse(p, &p);
return 0;
}
early_param("alloc_mptable", parse_alloc_mptable_opt);
void __init early_reserve_e820_mpc_new(void)
{
if (enable_update_mptable && alloc_mptable) {
u64 startt = 0;
#ifdef CONFIG_X86_TRAMPOLINE
startt = TRAMPOLINE_BASE;
#endif
mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
}
}
static int __init update_mp_table(void)
{
char str[16];
char oem[10];
struct intel_mp_floating *mpf;
struct mp_config_table *mpc;
struct mp_config_table *mpc_new;
if (!enable_update_mptable)
return 0;
mpf = mpf_found;
if (!mpf)
return 0;
/*
* Now see if we need to go further.
*/
if (mpf->mpf_feature1 != 0)
return 0;
if (!mpf->mpf_physptr)
return 0;
mpc = phys_to_virt(mpf->mpf_physptr);
if (!smp_check_mpc(mpc, oem, str))
return 0;
printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf));
printk(KERN_INFO "mpf_physptr: %x\n", mpf->mpf_physptr);
if (mpc_new_phys && mpc->mpc_length > mpc_new_length) {
mpc_new_phys = 0;
printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
mpc_new_length);
}
if (!mpc_new_phys) {
unsigned char old, new;
/* check if we can change the postion */
mpc->mpc_checksum = 0;
old = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
mpc->mpc_checksum = 0xff;
new = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
if (old == new) {
printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
return 0;
}
printk(KERN_INFO "use in-positon replacing\n");
} else {
mpf->mpf_physptr = mpc_new_phys;
mpc_new = phys_to_virt(mpc_new_phys);
memcpy(mpc_new, mpc, mpc->mpc_length);
mpc = mpc_new;
/* check if we can modify that */
if (mpc_new_phys - mpf->mpf_physptr) {
struct intel_mp_floating *mpf_new;
/* steal 16 bytes from [0, 1k) */
printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
mpf_new = phys_to_virt(0x400 - 16);
memcpy(mpf_new, mpf, 16);
mpf = mpf_new;
mpf->mpf_physptr = mpc_new_phys;
}
mpf->mpf_checksum = 0;
mpf->mpf_checksum -= mpf_checksum((unsigned char *)mpf, 16);
printk(KERN_INFO "mpf_physptr new: %x\n", mpf->mpf_physptr);
}
/*
* only replace the one with mp_INT and
* MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
* already in mp_irqs , stored by ... and mp_config_acpi_gsi,
* may need pci=routeirq for all coverage
*/
replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
return 0;
}
late_initcall(update_mp_table);
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