mpparse.c

linux-2.6.15.6

	/*
	 * We set up most of the low 16 IO-APIC pins according to MPS rules.
	 */
	construct_default_ioirq_mptable(mpc_default_type);

	lintsrc.mpc_type = MP_LINTSRC;
	lintsrc.mpc_irqflag = 0;		/* conforming */
	lintsrc.mpc_srcbusid = 0;
	lintsrc.mpc_srcbusirq = 0;
	lintsrc.mpc_destapic = MP_APIC_ALL;
	for (i = 0; i < 2; i++) {
		lintsrc.mpc_irqtype = linttypes[i];
		lintsrc.mpc_destapiclint = i;
		MP_lintsrc_info(&lintsrc);
	}
}

static struct intel_mp_floating *mpf_found;

/*
 * Scan the memory blocks for an SMP configuration block.
 */
void __init get_smp_config (void)
{
	struct intel_mp_floating *mpf = mpf_found;

	/*
 	 * ACPI supports both logical (e.g. Hyper-Threading) and physical 
 	 * processors, where MPS only supports physical.
 	 */
 	if (acpi_lapic && acpi_ioapic) {
 		printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
 		return;
	}
 	else if (acpi_lapic)
 		printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");

	printk("Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
	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;
	}

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

		printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
		construct_default_ISA_mptable(mpf->mpf_feature1);

	} else if (mpf->mpf_physptr) {

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

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

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

			construct_default_ioirq_mptable(0);
		}

	} else
		BUG();

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

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

	Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
	if (sizeof(*mpf) != 16)
		__bad_mpf_size();

	while (length > 0) {
		mpf = (struct intel_mp_floating *)bp;
		if ((*bp == SMP_MAGIC_IDENT) &&
			(mpf->mpf_length == 1) &&
			!mpf_checksum((unsigned char *)bp, 16) &&
			((mpf->mpf_specification == 1)
				|| (mpf->mpf_specification == 4)) ) {

			smp_found_config = 1;
			reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
			if (mpf->mpf_physptr)
				reserve_bootmem_generic(mpf->mpf_physptr, PAGE_SIZE);
			mpf_found = mpf;
			return 1;
		}
		bp += 4;
		length -= 16;
	}
	return 0;
}

void __init find_intel_smp (void)
{
	unsigned int address;

	/*
	 * FIXME: Linux assumes you have 640K of base ram..
	 * this continues the error...
	 *
	 * 1) Scan the bottom 1K for a signature
	 * 2) Scan the top 1K of base RAM
	 * 3) Scan the 64K of bios
	 */
	if (smp_scan_config(0x0,0x400) ||
		smp_scan_config(639*0x400,0x400) ||
			smp_scan_config(0xF0000,0x10000))
		return;
	/*
	 * If it is an SMP machine we should know now, 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.
	 */

	address = *(unsigned short *)phys_to_virt(0x40E);
	address <<= 4;
	if (smp_scan_config(address, 0x1000))
		return;

	/* If we have come this far, we did not find an MP table  */
	 printk(KERN_INFO "No mptable found.\n");
}

/*
 * - 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

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 = GET_APIC_VERSION(apic_read(APIC_LVR));
	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);
}

#ifdef CONFIG_X86_IO_APIC

#define MP_ISA_BUS		0
#define MP_MAX_IOAPIC_PIN	127

static struct mp_ioapic_routing {
	int			apic_id;
	int			gsi_start;
	int			gsi_end;
	u32			pin_programmed[4];
} mp_ioapic_routing[MAX_IO_APICS];


static int mp_find_ioapic (
	int			gsi)
{
	int			i = 0;

	/* Find the IOAPIC that manages this GSI. */
	for (i = 0; i < nr_ioapics; i++) {
		if ((gsi >= mp_ioapic_routing[i].gsi_start)
			&& (gsi <= mp_ioapic_routing[i].gsi_end))
			return i;
	}

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

	return -1;
}
	

void __init mp_register_ioapic (
	u8			id, 
	u32			address,
	u32			gsi_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 = id;
	mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
	
	/* 
	 * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
	 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
	 */
	mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
	mp_ioapic_routing[idx].gsi_start = gsi_base;
	mp_ioapic_routing[idx].gsi_end = gsi_base + 
		io_apic_get_redir_entries(idx);

	printk(KERN_INFO "IOAPIC[%d]: apic_id %d, 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_start,
		mp_ioapic_routing[idx].gsi_end);

	return;
}


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

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

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

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

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

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

	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
	 * overridden by (MADT) interrupt source override entries.
	 */
	for (i = 0; i < 16; i++) {
		int idx;

		for (idx = 0; idx < mp_irq_entries; idx++) {
			struct mpc_config_intsrc *irq = mp_irqs + idx;

			/* Do we already have a mapping for this ISA IRQ? */
			if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
				break;

			/* Do we already have a mapping for this IOAPIC pin */
			if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
				(irq->mpc_dstirq == i))
				break;
		}

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

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

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

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

	return;
}

#define MAX_GSI_NUM	4096

int mp_register_gsi(u32 gsi, int edge_level, int active_high_low)
{
	int			ioapic = -1;
	int			ioapic_pin = 0;
	int			idx, bit = 0;
	static int		pci_irq = 16;
	/*
	 * Mapping between Global System Interrupts, which
	 * represent all possible interrupts, to the IRQs
	 * assigned to actual devices.
	 */
	static int		gsi_to_irq[MAX_GSI_NUM];

	if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
		return gsi;

	/* Don't set up the ACPI SCI because it's already set up */
	if (acpi_fadt.sci_int == gsi)
		return gsi;

	ioapic = mp_find_ioapic(gsi);
	if (ioapic < 0) {
		printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
		return gsi;
	}

	ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_start;

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

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

	if (edge_level) {
		/*
		 * For PCI devices assign IRQs in order, avoiding gaps
		 * due to unused I/O APIC pins.
		 */
		int irq = gsi;
		if (gsi < MAX_GSI_NUM) {
			if (gsi > 15)
				gsi = pci_irq++;
			/*
			 * Don't assign IRQ used by ACPI SCI
			 */
			if (gsi == acpi_fadt.sci_int)
				gsi = pci_irq++;
			gsi_to_irq[irq] = gsi;
		} else {
			printk(KERN_ERR "GSI %u is too high\n", gsi);
			return gsi;
		}
	}

	io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
		edge_level == ACPI_EDGE_SENSITIVE ? 0 : 1,
		active_high_low == ACPI_ACTIVE_HIGH ? 0 : 1);
	return gsi;
}

#endif /*CONFIG_X86_IO_APIC*/
#endif /*CONFIG_ACPI*/