mpparse.c

linux-2.4.29操作系统的源码

}

static struct intel_mp_floating *mpf_found;

/*
 * Scan the memory blocks for an SMP configuration block.
 */
void __init get_smp_config (void)
{
	struct intel_mp_floating *mpf = mpf_found;
 	/*
 	 * ACPI may be used to obtain the entire SMP configuration or just to 
 	 * enumerate/configure processors (CONFIG_ACPI_HT_ONLY).  Note that 
 	 * ACPI supports both logical (e.g. Hyper-Threading) and physical 
 	 * processors, where MPS only supports physical.
 	 */
 	if (acpi_lapic && acpi_ioapic) {
 		printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
 		return;
 	}
 	else if (acpi_lapic)
 		printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
 
	printk("Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
	if (mpf->mpf_feature2 & (1<<7)) {
		printk("    IMCR and PIC compatibility mode.\n");
		pic_mode = 1;
	} else {
		printk("    Virtual Wire compatibility mode.\n");
		pic_mode = 0;
	}

	/*
	 * Now see if we need to read further.
	 */
	if (mpf->mpf_feature1 != 0) {

		printk("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(__va(mpf->mpf_physptr))) {
			smp_found_config = 0;
			printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
			printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
			return;
		}
		/*
		 * If there are no explicit MP IRQ entries, then we are
		 * broken.  We set up most of the low 16 IO-APIC pins to
		 * ISA defaults and hope it will work.
		 */
		if (!mp_irq_entries) {
			struct mpc_config_bus bus;

			printk("BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");

			bus.mpc_type = MP_BUS;
			bus.mpc_busid = 0;
			memcpy(bus.mpc_bustype, "ISA   ", 6);
			MP_bus_info(&bus);

			construct_default_ioirq_mptable(0);
		}

	} else
		BUG();

	printk("Processors: %d\n", num_processors);
	/*
	 * Only use the first configuration found.
	 */
}

static int __init smp_scan_config (unsigned long base, unsigned long length)
{
	unsigned int *bp = phys_to_virt(base);
	struct intel_mp_floating *mpf;

	printk("Scan SMP from %p for %ld bytes.\n", bp,length);
	if (sizeof(*mpf) != 16)
		printk("Error: MPF size\n");

	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;
			printk(KERN_INFO "found SMP MP-table at %016lx\n",
						virt_to_phys(mpf));
			reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE); 
			if (mpf->mpf_physptr)
				reserve_bootmem_generic(mpf->mpf_physptr, PAGE_SIZE); 
			mpf_found = mpf;
			return 1;
		}
		bp += 4;
		length -= 16;
	}
	return 0;
}

void __init find_intel_smp (void)
{
	unsigned long address;

	/*
	 * FIXME: Linux assumes you have 640K of base ram..
	 * this continues the error...
	 *
	 * 1) Scan the bottom 1K for a signature
	 * 2) Scan the top 1K of base RAM
	 * 3) Scan the 64K of bios
	 */
	if (smp_scan_config(0x0,0x400) ||
		smp_scan_config(639*0x400,0x400) ||
			smp_scan_config(0xF0000,0x10000))
		return;
		printk("ok\n");
		
	/*
	 * 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 = *(unsigned short *)phys_to_virt(0x40E);
	address <<= 4;
	smp_scan_config(address, 0x400);
	if (smp_found_config)
		printk(KERN_WARNING "WARNING: MP table in the EBDA can be UNSAFE, contact [e-mail] if you experience SMP problems!\n");
}

/*
 * - Intel MP Configuration Table
 */
void __init find_smp_config (void)
{
#ifdef CONFIG_X86_LOCAL_APIC
	find_intel_smp();
#endif
}


/* --------------------------------------------------------------------------
                            ACPI-based MP Configuration
   -------------------------------------------------------------------------- */

#ifdef CONFIG_ACPI_BOOT

void __init mp_register_lapic_address (
	u64			address)
{
	mp_lapic_addr = (unsigned long) address;

	set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);

	if (boot_cpu_id == -1U)
		boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));

	Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
}


void __init mp_register_lapic (
	u8			id, 
	u8			enabled)
{
	struct mpc_config_processor processor;
	int			boot_cpu = 0;
	
	if (id >= MAX_APICS) {
		printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
			id, MAX_APICS);
		return;
	}

	if (id == boot_cpu_physical_apicid)
		boot_cpu = 1;

	processor.mpc_type = MP_PROCESSOR;
	processor.mpc_apicid = id;
	processor.mpc_apicver = 0x10; /* TBD: lapic version */
	processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
	processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
	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;

	MP_processor_info(&processor);
}

#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)

#define MP_ISA_BUS		0
#define MP_MAX_IOAPIC_PIN	127

struct mp_ioapic_routing {
	int			apic_id;
	int			irq_start;
	int			irq_end;
	u32			pin_programmed[4];
} mp_ioapic_routing[MAX_IO_APICS];


static int __init mp_find_ioapic (
	int			irq)
{
	int			i = 0;

	/* Find the IOAPIC that manages this IRQ. */
	for (i = 0; i < nr_ioapics; i++) {
		if ((irq >= mp_ioapic_routing[i].irq_start)
			&& (irq <= mp_ioapic_routing[i].irq_end))
			return i;
	}

	printk(KERN_ERR "ERROR: Unable to locate IOAPIC for IRQ %d\n", irq);

	return -1;
}
	

void __init mp_register_ioapic (
	u8			id, 
	u32			address,
	u32			irq_base)
{
	int			idx = 0;

	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 MADT table, skipping!\n");
		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 = io_apic_get_unique_id(idx, id);
	mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
	
	/* 
	 * Build basic IRQ lookup table to facilitate irq->io_apic lookups
	 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
	 */
	mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
	mp_ioapic_routing[idx].irq_start = irq_base;
	mp_ioapic_routing[idx].irq_end = irq_base + 
		io_apic_get_redir_entries(idx);

	printk("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
		"IRQ %d-%d\n", idx, mp_ioapics[idx].mpc_apicid, 
		mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
		mp_ioapic_routing[idx].irq_start,
		mp_ioapic_routing[idx].irq_end);

	return;
}


void __init mp_override_legacy_irq (
	u8			bus_irq,
	u8			polarity, 
	u8			trigger, 
	u32			global_irq)
{
	struct mpc_config_intsrc intsrc;
	int			ioapic = -1;
	int			pin = -1;

	/* 
	 * Convert 'global_irq' to 'ioapic.pin'.
	 */
	ioapic = mp_find_ioapic(global_irq);
	if (ioapic < 0)
		return;
	pin = global_irq - mp_ioapic_routing[ioapic].irq_start;

	/*
	 * TBD: This check is for faulty timer entries, where the override
	 *      erroneously sets the trigger to level, resulting in a HUGE 
	 *      increase of timer interrupts!
	 */
	if ((bus_irq == 0) && (trigger == 3))
		trigger = 1;

	intsrc.mpc_type = MP_INTSRC;
	intsrc.mpc_irqtype = mp_INT;
	intsrc.mpc_irqflag = (trigger << 2) | polarity;
	intsrc.mpc_srcbus = MP_ISA_BUS;
	intsrc.mpc_srcbusirq = bus_irq;				       /* IRQ */
	intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;	   /* APIC ID */
	intsrc.mpc_dstirq = pin;				    /* INTIN# */

	Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n", 
		intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3, 
		(intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus, 
		intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);

	mp_irqs[mp_irq_entries] = intsrc;
	if (++mp_irq_entries == MAX_IRQ_SOURCES)
		panic("Max # of irq sources exceeded!\n");

	return;
}


void __init mp_config_acpi_legacy_irqs (void)
{
	struct mpc_config_intsrc intsrc;
	int			i = 0;
	int			ioapic = -1;

	/* 
	 * Fabricate the legacy ISA bus (bus #31).
	 */
	mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
	Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);

	/* 
	 * Locate the IOAPIC that manages the ISA IRQs (0-15). 
	 */
	ioapic = mp_find_ioapic(0);
	if (ioapic < 0)
		return;

	intsrc.mpc_type = MP_INTSRC;
	intsrc.mpc_irqflag = 0;					/* Conforming */
	intsrc.mpc_srcbus = MP_ISA_BUS;
	intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;

	/* 
	 * Use the default configuration for the IRQs 0-15.  Unless
	 * overriden by (MADT) interrupt source override entries.
	 */
	for (i = 0; i < 16; i++) {
		int idx;

		for (idx = 0; idx < mp_irq_entries; idx++)
			if (mp_irqs[idx].mpc_srcbus == MP_ISA_BUS &&
				(mp_irqs[idx].mpc_dstapic == intsrc.mpc_dstapic) &&
				(mp_irqs[idx].mpc_srcbusirq == i ||
				mp_irqs[idx].mpc_dstirq == i))
					break;

		if (idx != mp_irq_entries) {
			printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
			continue;			  /* IRQ already used */
		}

		intsrc.mpc_irqtype = mp_INT;
		intsrc.mpc_srcbusirq = i;		   /* Identity mapped */
		intsrc.mpc_dstirq = i;

		Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
			"%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3, 
			(intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus, 
			intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, 
			intsrc.mpc_dstirq);

		mp_irqs[mp_irq_entries] = intsrc;
		if (++mp_irq_entries == MAX_IRQ_SOURCES)
			panic("Max # of irq sources exceeded!\n");
	}

	return;
}



#ifndef CONFIG_ACPI_HT_ONLY

extern FADT_DESCRIPTOR acpi_fadt;

#endif /*CONFIG_ACPI_HT_ONLY*/

int acpi_tolerant;

#ifdef CONFIG_ACPI_PCI

void __init mp_parse_prt (void)
{
	struct list_head	*node = NULL;
	struct acpi_prt_entry	*entry = NULL;
	int			vector = 0;
	int			ioapic = -1;
	int			ioapic_pin = 0;
	int			irq = 0;
	int			idx, bit = 0;
	int			edge_level = 0;
	int			active_high_low = 0;

	/*
	 * Parsing through the PCI Interrupt Routing Table (PRT) and program
	 * routing for all static (IOAPIC-direct) entries.
	 */
	list_for_each(node, &acpi_prt.entries) {
		entry = list_entry(node, struct acpi_prt_entry, node);

		/* Need to get irq for dynamic entry */
		if (entry->link.handle) {
			irq = acpi_pci_link_get_irq(entry->link.handle, entry->link.index, &edge_level, &active_high_low);
			if (!irq)
				continue;
		} else {
			edge_level = 1;
			active_high_low = 1;
			irq = entry->link.index;
		}

  		/* Don't set up the ACPI SCI because it's already set up */
                if (acpi_fadt.sci_int == irq) {
                         entry->irq = irq; /*we still need to set entry's irq*/
 			continue;
                }

		ioapic = mp_find_ioapic(irq);
		if (ioapic < 0)
			continue;
		ioapic_pin = irq - mp_ioapic_routing[ioapic].irq_start;

		/* 
		 * Avoid pin reprogramming.  PRTs typically include entries  
		 * with redundant pin->irq mappings (but unique PCI devices);
		 * we only only program the IOAPIC on the first.
		 */
		bit = ioapic_pin % 32;
		idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
		if (idx > 3) {
			printk(KERN_ERR "Invalid reference to IOAPIC pin "
				"%d-%d\n", mp_ioapic_routing[ioapic].apic_id, 
				ioapic_pin);
			continue;
		}
		if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
			Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
				mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
			entry->irq = irq;
			continue;
		}

		mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);

		vector = io_apic_set_pci_routing(ioapic, ioapic_pin, irq, edge_level, active_high_low);
		if (vector)
			entry->irq = irq;

		printk(KERN_DEBUG "%02x:%02x:%02x[%c] -> %d-%d -> vector 0x%02x"
			" -> IRQ %d %s %s\n", entry->id.segment, entry->id.bus,
			entry->id.device, ('A' + entry->pin),
			mp_ioapic_routing[ioapic].apic_id, ioapic_pin, vector,
			entry->irq, edge_level ? "level" : "edge",
			active_high_low ? "low" : "high");
	}

	print_IO_APIC();

	return;
}

#endif /*CONFIG_ACPI_PCI*/

#endif /*CONFIG_X86_IO_APIC && CONFIG_ACPI_INTERPRETER*/

#endif /*CONFIG_ACPI_BOOT*/