788 lines
20 KiB
C
788 lines
20 KiB
C
/*
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* Intel Multiprocessor Specification 1.1 and 1.4
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* compliant MP-table parsing routines.
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*
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* (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
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* (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
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* (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
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*/
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/bootmem.h>
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#include <linux/kernel_stat.h>
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#include <linux/mc146818rtc.h>
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#include <linux/bitops.h>
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <asm/smp.h>
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#include <asm/mtrr.h>
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#include <asm/mpspec.h>
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#include <asm/pgalloc.h>
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#include <asm/io_apic.h>
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#include <asm/proto.h>
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#include <asm/acpi.h>
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#include <asm/bios_ebda.h>
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#include <mach_apic.h>
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#ifdef CONFIG_X86_32
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#include <mach_apicdef.h>
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#include <mach_mpparse.h>
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#endif
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/*
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* Checksum an MP configuration block.
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*/
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static int __init mpf_checksum(unsigned char *mp, int len)
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{
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int sum = 0;
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while (len--)
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sum += *mp++;
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return sum & 0xFF;
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}
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#ifdef CONFIG_X86_NUMAQ
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/*
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* Have to match translation table entries to main table entries by counter
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* hence the mpc_record variable .... can't see a less disgusting way of
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* doing this ....
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*/
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static int mpc_record;
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static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY]
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__cpuinitdata;
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#endif
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static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
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{
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int apicid;
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char *bootup_cpu = "";
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if (!(m->mpc_cpuflag & CPU_ENABLED)) {
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disabled_cpus++;
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return;
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}
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#ifdef CONFIG_X86_NUMAQ
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apicid = mpc_apic_id(m, translation_table[mpc_record]);
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#else
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apicid = m->mpc_apicid;
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#endif
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if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
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bootup_cpu = " (Bootup-CPU)";
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boot_cpu_physical_apicid = m->mpc_apicid;
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}
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printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
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generic_processor_info(apicid, m->mpc_apicver);
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}
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#ifdef CONFIG_X86_IO_APIC
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static void __init MP_bus_info(struct mpc_config_bus *m)
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{
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char str[7];
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memcpy(str, m->mpc_bustype, 6);
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str[6] = 0;
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#ifdef CONFIG_X86_NUMAQ
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mpc_oem_bus_info(m, str, translation_table[mpc_record]);
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#else
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printk(KERN_INFO "Bus #%d is %s\n", m->mpc_busid, str);
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#endif
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#if MAX_MP_BUSSES < 256
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if (m->mpc_busid >= MAX_MP_BUSSES) {
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printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
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" is too large, max. supported is %d\n",
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m->mpc_busid, str, MAX_MP_BUSSES - 1);
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return;
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}
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#endif
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if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
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set_bit(m->mpc_busid, mp_bus_not_pci);
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#if defined(CONFIG_EISA) || defined (CONFIG_MCA)
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mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
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#endif
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} else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
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#ifdef CONFIG_X86_NUMAQ
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mpc_oem_pci_bus(m, translation_table[mpc_record]);
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#endif
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clear_bit(m->mpc_busid, mp_bus_not_pci);
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#if defined(CONFIG_EISA) || defined (CONFIG_MCA)
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mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
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} else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
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mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
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} else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
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mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
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#endif
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} else
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printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
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}
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#endif
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#ifdef CONFIG_X86_IO_APIC
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static int bad_ioapic(unsigned long address)
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{
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if (nr_ioapics >= MAX_IO_APICS) {
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printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
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"(found %d)\n", MAX_IO_APICS, nr_ioapics);
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panic("Recompile kernel with bigger MAX_IO_APICS!\n");
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}
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if (!address) {
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printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
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" found in table, skipping!\n");
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return 1;
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}
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return 0;
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}
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static void __init MP_ioapic_info(struct mpc_config_ioapic *m)
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{
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if (!(m->mpc_flags & MPC_APIC_USABLE))
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return;
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printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
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m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
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if (bad_ioapic(m->mpc_apicaddr))
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return;
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mp_ioapics[nr_ioapics].mp_apicaddr = m->mpc_apicaddr;
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mp_ioapics[nr_ioapics].mp_apicid = m->mpc_apicid;
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mp_ioapics[nr_ioapics].mp_type = m->mpc_type;
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mp_ioapics[nr_ioapics].mp_apicver = m->mpc_apicver;
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mp_ioapics[nr_ioapics].mp_flags = m->mpc_flags;
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nr_ioapics++;
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}
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static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
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{
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printk(KERN_INFO "Int: type %d, pol %d, trig %d, bus %02x,"
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" IRQ %02x, APIC ID %x, APIC INT %02x\n",
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m->mpc_irqtype, m->mpc_irqflag & 3,
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(m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
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m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
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mp_irqs[mp_irq_entries].mp_dstapic = m->mpc_dstapic;
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mp_irqs[mp_irq_entries].mp_type = m->mpc_type;
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mp_irqs[mp_irq_entries].mp_irqtype = m->mpc_irqtype;
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mp_irqs[mp_irq_entries].mp_irqflag = m->mpc_irqflag;
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mp_irqs[mp_irq_entries].mp_srcbus = m->mpc_srcbus;
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mp_irqs[mp_irq_entries].mp_srcbusirq = m->mpc_srcbusirq;
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mp_irqs[mp_irq_entries].mp_dstirq = m->mpc_dstirq;
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if (++mp_irq_entries == MAX_IRQ_SOURCES)
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panic("Max # of irq sources exceeded!!\n");
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}
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#endif
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static void __init MP_lintsrc_info(struct mpc_config_lintsrc *m)
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{
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printk(KERN_INFO "Lint: type %d, pol %d, trig %d, bus %02x,"
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" IRQ %02x, APIC ID %x, APIC LINT %02x\n",
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m->mpc_irqtype, m->mpc_irqflag & 3,
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(m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
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m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
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}
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#ifdef CONFIG_X86_NUMAQ
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static void __init MP_translation_info(struct mpc_config_translation *m)
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{
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printk(KERN_INFO
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"Translation: record %d, type %d, quad %d, global %d, local %d\n",
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mpc_record, m->trans_type, m->trans_quad, m->trans_global,
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m->trans_local);
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if (mpc_record >= MAX_MPC_ENTRY)
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printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
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else
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translation_table[mpc_record] = m; /* stash this for later */
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if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
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node_set_online(m->trans_quad);
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}
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/*
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* Read/parse the MPC oem tables
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*/
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static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable,
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unsigned short oemsize)
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{
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int count = sizeof(*oemtable); /* the header size */
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unsigned char *oemptr = ((unsigned char *)oemtable) + count;
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mpc_record = 0;
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printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n",
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oemtable);
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if (memcmp(oemtable->oem_signature, MPC_OEM_SIGNATURE, 4)) {
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printk(KERN_WARNING
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"SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
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oemtable->oem_signature[0], oemtable->oem_signature[1],
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oemtable->oem_signature[2], oemtable->oem_signature[3]);
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return;
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}
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if (mpf_checksum((unsigned char *)oemtable, oemtable->oem_length)) {
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printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
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return;
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}
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while (count < oemtable->oem_length) {
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switch (*oemptr) {
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case MP_TRANSLATION:
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{
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struct mpc_config_translation *m =
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(struct mpc_config_translation *)oemptr;
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MP_translation_info(m);
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oemptr += sizeof(*m);
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count += sizeof(*m);
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++mpc_record;
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break;
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}
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default:
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{
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printk(KERN_WARNING
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"Unrecognised OEM table entry type! - %d\n",
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(int)*oemptr);
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return;
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}
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}
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}
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}
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static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
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char *productid)
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{
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if (strncmp(oem, "IBM NUMA", 8))
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printk("Warning! May not be a NUMA-Q system!\n");
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if (mpc->mpc_oemptr)
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smp_read_mpc_oem((struct mp_config_oemtable *)mpc->mpc_oemptr,
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mpc->mpc_oemsize);
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}
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#endif /* CONFIG_X86_NUMAQ */
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/*
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* Read/parse the MPC
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*/
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static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
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{
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char str[16];
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char oem[10];
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int count = sizeof(*mpc);
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unsigned char *mpt = ((unsigned char *)mpc) + count;
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if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
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printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
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mpc->mpc_signature[0], mpc->mpc_signature[1],
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mpc->mpc_signature[2], mpc->mpc_signature[3]);
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return 0;
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}
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if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
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printk(KERN_ERR "MPTABLE: checksum error!\n");
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return 0;
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}
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if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
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printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
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mpc->mpc_spec);
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return 0;
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}
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if (!mpc->mpc_lapic) {
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printk(KERN_ERR "MPTABLE: null local APIC address!\n");
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return 0;
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}
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memcpy(oem, mpc->mpc_oem, 8);
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oem[8] = 0;
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printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
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memcpy(str, mpc->mpc_productid, 12);
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str[12] = 0;
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#ifdef CONFIG_X86_32
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mps_oem_check(mpc, oem, str);
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#endif
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printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
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printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
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/* save the local APIC address, it might be non-default */
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if (!acpi_lapic)
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mp_lapic_addr = mpc->mpc_lapic;
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if (early)
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return 1;
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/*
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* Now process the configuration blocks.
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*/
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#ifdef CONFIG_X86_NUMAQ
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mpc_record = 0;
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#endif
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while (count < mpc->mpc_length) {
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switch (*mpt) {
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case MP_PROCESSOR:
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{
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struct mpc_config_processor *m =
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(struct mpc_config_processor *)mpt;
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/* ACPI may have already provided this data */
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if (!acpi_lapic)
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MP_processor_info(m);
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mpt += sizeof(*m);
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count += sizeof(*m);
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break;
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}
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case MP_BUS:
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{
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struct mpc_config_bus *m =
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(struct mpc_config_bus *)mpt;
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#ifdef CONFIG_X86_IO_APIC
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MP_bus_info(m);
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#endif
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mpt += sizeof(*m);
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count += sizeof(*m);
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break;
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}
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case MP_IOAPIC:
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{
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#ifdef CONFIG_X86_IO_APIC
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struct mpc_config_ioapic *m =
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(struct mpc_config_ioapic *)mpt;
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MP_ioapic_info(m);
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#endif
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mpt += sizeof(struct mpc_config_ioapic);
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count += sizeof(struct mpc_config_ioapic);
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break;
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}
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case MP_INTSRC:
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{
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#ifdef CONFIG_X86_IO_APIC
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struct mpc_config_intsrc *m =
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(struct mpc_config_intsrc *)mpt;
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MP_intsrc_info(m);
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#endif
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mpt += sizeof(struct mpc_config_intsrc);
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count += sizeof(struct mpc_config_intsrc);
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break;
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}
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case MP_LINTSRC:
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{
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struct mpc_config_lintsrc *m =
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(struct mpc_config_lintsrc *)mpt;
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MP_lintsrc_info(m);
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mpt += sizeof(*m);
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count += sizeof(*m);
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break;
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}
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default:
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/* wrong mptable */
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printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
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printk(KERN_ERR "type %x\n", *mpt);
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print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
|
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1, mpc, mpc->mpc_length, 1);
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count = mpc->mpc_length;
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break;
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}
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#ifdef CONFIG_X86_NUMAQ
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++mpc_record;
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#endif
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}
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setup_apic_routing();
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if (!num_processors)
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printk(KERN_ERR "MPTABLE: no processors registered!\n");
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return num_processors;
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}
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#ifdef CONFIG_X86_IO_APIC
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static int __init ELCR_trigger(unsigned int irq)
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{
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unsigned int port;
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port = 0x4d0 + (irq >> 3);
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return (inb(port) >> (irq & 7)) & 1;
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}
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|
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static void __init construct_default_ioirq_mptable(int mpc_default_type)
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{
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struct mpc_config_intsrc intsrc;
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int i;
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int ELCR_fallback = 0;
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intsrc.mpc_type = MP_INTSRC;
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intsrc.mpc_irqflag = 0; /* conforming */
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intsrc.mpc_srcbus = 0;
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intsrc.mpc_dstapic = mp_ioapics[0].mp_apicid;
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intsrc.mpc_irqtype = mp_INT;
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/*
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* If true, we have an ISA/PCI system with no IRQ entries
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* in the MP table. To prevent the PCI interrupts from being set up
|
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* incorrectly, we try to use the ELCR. The sanity check to see if
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* there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
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* never be level sensitive, so we simply see if the ELCR agrees.
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* If it does, we assume it's valid.
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*/
|
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if (mpc_default_type == 5) {
|
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printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
|
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"falling back to ELCR\n");
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if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
|
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ELCR_trigger(13))
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printk(KERN_ERR "ELCR contains invalid data... "
|
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"not using ELCR\n");
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else {
|
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printk(KERN_INFO
|
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"Using ELCR to identify PCI interrupts\n");
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ELCR_fallback = 1;
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}
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}
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for (i = 0; i < 16; i++) {
|
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switch (mpc_default_type) {
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case 2:
|
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if (i == 0 || i == 13)
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continue; /* IRQ0 & IRQ13 not connected */
|
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/* fall through */
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default:
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if (i == 2)
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continue; /* IRQ2 is never connected */
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}
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|
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if (ELCR_fallback) {
|
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/*
|
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* If the ELCR indicates a level-sensitive interrupt, we
|
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* copy that information over to the MP table in the
|
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* irqflag field (level sensitive, active high polarity).
|
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*/
|
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if (ELCR_trigger(i))
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intsrc.mpc_irqflag = 13;
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else
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intsrc.mpc_irqflag = 0;
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}
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intsrc.mpc_srcbusirq = i;
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intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
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MP_intsrc_info(&intsrc);
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}
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|
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intsrc.mpc_irqtype = mp_ExtINT;
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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);
|
|
}
|