patch-2.3.40 linux/arch/i386/kernel/mpparse.c

• Lines: 515
• Date: Thu Jan 20 09:51:42 2000
• Orig file: v2.3.39/linux/arch/i386/kernel/mpparse.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.39/linux/arch/i386/kernel/mpparse.c linux/arch/i386/kernel/mpparse.c
@@ -0,0 +1,514 @@
+/*
+ *	Intel Multiprocessor Specificiation 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>
+ *
+ *	Fixes
+ *		Erich Boleyn	:	MP v1.4 and additional changes.
+ *		Alan Cox	:	Added EBDA scanning
+ *		Ingo Molnar	:	various cleanups and rewrites
+ *	Maciej W. Rozycki	:	Bits for genuine 82489DX timers
+ */
+
+#include <linux/mm.h>
+#include <linux/irq.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/config.h>
+#include <linux/bootmem.h>
+#include <linux/smp_lock.h>
+#include <linux/kernel_stat.h>
+#include <linux/mc146818rtc.h>
+
+#include <asm/smp.h>
+#include <asm/mtrr.h>
+#include <asm/mpspec.h>
+#include <asm/pgalloc.h>
+
+/* Have we found an MP table */
+int smp_found_config = 0;
+
+/*
+ * Various Linux-internal data structures created from the
+ * MP-table.
+ */
+int apic_version [NR_CPUS];
+int mp_bus_id_to_type [MAX_MP_BUSSES] = { -1, };
+int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { -1, };
+int mp_current_pci_id = 0;
+int pic_mode;
+unsigned long mp_lapic_addr = 0;
+
+/* Processor that is doing the boot up */
+unsigned int boot_cpu_id = 0;
+/* Internal processor count */
+static unsigned int num_processors = 1;
+
+/* Bitmask of physically existing CPUs */
+unsigned long phys_cpu_present_map = 0;
+
+/*
+ * IA s/w dev Vol 3, Section 7.4
+ */
+#define APIC_DEFAULT_PHYS_BASE 0xfee00000
+
+/*
+ * Intel MP BIOS table parsing routines:
+ */
+
+#ifndef CONFIG_X86_VISWS_APIC
+/*
+ * 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;
+}
+
+/*
+ * Processor encoding in an MP configuration block
+ */
+
+static char __init *mpc_family(int family,int model)
+{
+	static char n[32];
+	static char *model_defs[]=
+	{
+		"80486DX","80486DX",
+		"80486SX","80486DX/2 or 80487",
+		"80486SL","80486SX/2",
+		"Unknown","80486DX/2-WB",
+		"80486DX/4","80486DX/4-WB"
+	};
+
+	switch (family) {
+		case 0x04:
+			if (model < 10)
+				return model_defs[model];
+			break;
+
+		case 0x05:
+			return("Pentium(tm)");
+
+		case 0x06:
+			return("Pentium(tm) Pro");
+
+		case 0x0F:
+			if (model == 0x0F)
+				return("Special controller");
+	}
+	sprintf(n,"Unknown CPU [%d:%d]",family, model);
+	return n;
+}
+
+static void __init MP_processor_info (struct mpc_config_processor *m)
+{
+	int ver;
+
+	if (!(m->mpc_cpuflag & CPU_ENABLED))
+		return;
+
+	printk("Processor #%d %s APIC version %d\n",
+		m->mpc_apicid,
+		mpc_family(	(m->mpc_cpufeature & CPU_FAMILY_MASK)>>8 ,
+				(m->mpc_cpufeature & CPU_MODEL_MASK)>>4),
+		m->mpc_apicver);
+
+	if (m->mpc_featureflag&(1<<0))
+		Dprintk("    Floating point unit present.\n");
+	if (m->mpc_featureflag&(1<<7))
+		Dprintk("    Machine Exception supported.\n");
+	if (m->mpc_featureflag&(1<<8))
+		Dprintk("    64 bit compare & exchange supported.\n");
+	if (m->mpc_featureflag&(1<<9))
+		Dprintk("    Internal APIC present.\n");
+
+	if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
+		Dprintk("    Bootup CPU\n");
+		boot_cpu_id = m->mpc_apicid;
+	} else
+		/* Boot CPU already counted */
+		num_processors++;
+
+	if (m->mpc_apicid > NR_CPUS) {
+		printk("Processor #%d unused. (Max %d processors).\n",
+			m->mpc_apicid, NR_CPUS);
+		return;
+	}
+	ver = m->mpc_apicver;
+
+	phys_cpu_present_map |= 1 << m->mpc_apicid;
+	/*
+	 * Validate version
+	 */
+	if (ver == 0x0) {
+		printk("BIOS bug, APIC version is 0 for CPU#%d! fixing up to 0x10. (tell your hw vendor)\n", m->mpc_apicid);
+		ver = 0x10;
+	}
+	apic_version[m->mpc_apicid] = ver;
+}
+
+static void __init MP_bus_info (struct mpc_config_bus *m)
+{
+	char str[7];
+
+	memcpy(str, m->mpc_bustype, 6);
+	str[6] = 0;
+	Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
+
+	if (strncmp(str, "ISA", 3) == 0) {
+		mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
+	} else {
+	if (strncmp(str, "EISA", 4) == 0) {
+		mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
+	} else {
+	if (strncmp(str, "PCI", 3) == 0) {
+		mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
+		mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
+		mp_current_pci_id++;
+	} else {
+		printk("Unknown bustype %s\n", str);
+		panic("cannot handle bus - mail to linux-smp@vger.rutgers.edu");
+	} } }
+}
+
+static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
+{
+	if (!(m->mpc_flags & MPC_APIC_USABLE))
+		return;
+
+	printk("I/O APIC #%d Version %d at 0x%lX.\n",
+		m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
+	if (nr_ioapics >= MAX_IO_APICS) {
+		printk("Max # of I/O APICs (%d) exceeded (found %d).\n",
+			MAX_IO_APICS, nr_ioapics);
+		panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
+	}
+	mp_ioapics[nr_ioapics] = *m;
+	nr_ioapics++;
+}
+
+static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
+{
+	mp_irqs [mp_irq_entries] = *m;
+	if (++mp_irq_entries == MAX_IRQ_SOURCES)
+		panic("Max # of irq sources exceeded!!\n");
+}
+
+static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
+{
+	/*
+	 * Well it seems all SMP boards in existence
+	 * use ExtINT/LVT1 == LINT0 and
+	 * NMI/LVT2 == LINT1 - the following check
+	 * will show us if this assumptions is false.
+	 * Until then we do not have to add baggage.
+	 */
+	if ((m->mpc_irqtype == mp_ExtINT) &&
+		(m->mpc_destapiclint != 0))
+			BUG();
+	if ((m->mpc_irqtype == mp_NMI) &&
+		(m->mpc_destapiclint != 1))
+			BUG();
+}
+
+/*
+ * Read/parse the MPC
+ */
+
+static int __init smp_read_mpc(struct mp_config_table *mpc)
+{
+	char str[16];
+	int count=sizeof(*mpc);
+	unsigned char *mpt=((unsigned char *)mpc)+count;
+
+	if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4))
+	{
+		panic("SMP 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 1;
+	}
+	if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length))
+	{
+		panic("SMP mptable: checksum error!\n");
+		return 1;
+	}
+	if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04)
+	{
+		printk("Bad Config Table version (%d)!!\n",mpc->mpc_spec);
+		return 1;
+	}
+	memcpy(str,mpc->mpc_oem,8);
+	str[8]=0;
+	printk("OEM ID: %s ",str);
+
+	memcpy(str,mpc->mpc_productid,12);
+	str[12]=0;
+	printk("Product ID: %s ",str);
+
+	printk("APIC at: 0x%lX\n",mpc->mpc_lapic);
+
+	/* save the local APIC address, it might be non-default */
+	mp_lapic_addr = mpc->mpc_lapic;
+
+	/*
+	 *	Now process the configuration blocks.
+	 */
+	while (count < mpc->mpc_length) {
+		switch(*mpt) {
+			case MP_PROCESSOR:
+			{
+				struct mpc_config_processor *m=
+					(struct mpc_config_processor *)mpt;
+				MP_processor_info(m);
+				mpt += sizeof(*m);
+				count += sizeof(*m);
+				break;
+			}
+			case MP_BUS:
+			{
+				struct mpc_config_bus *m=
+					(struct mpc_config_bus *)mpt;
+				MP_bus_info(m);
+				mpt += sizeof(*m);
+				count += sizeof(*m);
+				break;
+			}
+			case MP_IOAPIC:
+			{
+				struct mpc_config_ioapic *m=
+					(struct mpc_config_ioapic *)mpt;
+				MP_ioapic_info(m);
+				mpt+=sizeof(*m);
+				count+=sizeof(*m);
+				break;
+			}
+			case MP_INTSRC:
+			{
+				struct mpc_config_intsrc *m=
+					(struct mpc_config_intsrc *)mpt;
+
+				MP_intsrc_info(m);
+				mpt+=sizeof(*m);
+				count+=sizeof(*m);
+				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;
+			}
+		}
+	}
+	return num_processors;
+}
+
+/*
+ * Scan the memory blocks for an SMP configuration block.
+ */
+static int __init smp_get_mpf(struct intel_mp_floating *mpf)
+{
+	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;
+	}
+	smp_found_config = 1;
+	/*
+	 * default CPU id - if it's different in the mptable
+	 * then we change it before first using it.
+	 */
+	boot_cpu_id = 0;
+	/*
+	 * Now see if we need to read further.
+	 */
+	if (mpf->mpf_feature1 != 0) {
+		/*
+		 * local APIC has default address
+		 */
+		mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
+
+		/*
+		 * 2 CPUs, numbered 0 & 1.
+		 */
+		phys_cpu_present_map = 3;
+		num_processors = 2;
+
+		nr_ioapics = 1;
+		mp_ioapics[0].mpc_apicaddr = 0xFEC00000;
+		/*
+		 * Save the default type number, we
+		 * need it later to set the IO-APIC
+		 * up properly:
+		 */
+		mpc_default_type = mpf->mpf_feature1;
+
+		printk("Bus #0 is ");
+	}
+
+	switch (mpf->mpf_feature1) {
+		case 1:
+		case 5:
+			printk("ISA\n");
+			break;
+		case 2:
+			printk("EISA with no IRQ0 and no IRQ13 DMA chaining\n");
+			break;
+		case 6:
+		case 3:
+			printk("EISA\n");
+			break;
+		case 4:
+		case 7:
+			printk("MCA\n");
+			break;
+		case 0:
+			if (!mpf->mpf_physptr)
+				BUG();
+			break;
+		default:
+			printk("???\nUnknown standard configuration %d\n",
+				mpf->mpf_feature1);
+			return 1;
+	}
+	if (mpf->mpf_feature1 > 4) {
+		printk("Bus #1 is PCI\n");
+
+		/*
+		 * Set local APIC version to the integrated form.
+		 * It's initialized to zero otherwise, representing
+		 * a discrete 82489DX.
+		 */
+		apic_version[0] = 0x10;
+		apic_version[1] = 0x10;
+	}
+	/*
+	 * Read the physical hardware table. Anything here will override the
+	 * defaults.
+	 */
+	if (mpf->mpf_physptr)
+		smp_read_mpc((void *)mpf->mpf_physptr);
+
+	printk("Processors: %d\n", num_processors);
+	/*
+	 * Only use the first configuration found.
+	 */
+	return 1;
+}
+
+static int __init smp_scan_config(unsigned long base, unsigned long length)
+{
+	unsigned long *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)
+		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)) ) {
+
+			printk("found SMP MP-table at %08ld\n",
+						virt_to_phys(mpf));
+			smp_get_mpf(mpf);
+			return 1;
+		}
+		bp += 4;
+		length -= 16;
+	}
+	return 0;
+}
+
+void __init init_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;
+	smp_scan_config(address, 0x1000);
+	if (smp_found_config)
+		printk(KERN_WARNING "WARNING: MP table in the EBDA can be UNSAFE, contact linux-smp@vger.rutgers.edu if you experience SMP problems!\n");
+}
+
+#else
+
+/*
+ * The Visual Workstation is Intel MP compliant in the hardware
+ * sense, but it doesnt have a BIOS(-configuration table).
+ * No problem for Linux.
+ */
+void __init init_visws_smp(void)
+{
+	smp_found_config = 1;
+
+	phys_cpu_present_map |= 2; /* or in id 1 */
+	apic_version[1] |= 0x10; /* integrated APIC */
+	apic_version[0] |= 0x10;
+
+	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
+}
+
+#endif
+
+/*
+ * - Intel MP Configuration Table
+ * - or SGI Visual Workstation configuration
+ */
+void __init init_smp_config (void)
+{
+#ifdef CONFIG_X86_IO_APIC
+	init_intel_smp();
+#endif
+#ifdef CONFIG_VISWS
+	init_visws_smp();
+#endif
+}
+