diff options
Diffstat (limited to 'kernel/arch/x86/kernel/mpparse.c')
-rw-r--r-- | kernel/arch/x86/kernel/mpparse.c | 918 |
1 files changed, 918 insertions, 0 deletions
diff --git a/kernel/arch/x86/kernel/mpparse.c b/kernel/arch/x86/kernel/mpparse.c new file mode 100644 index 000000000..2d2a237f2 --- /dev/null +++ b/kernel/arch/x86/kernel/mpparse.c @@ -0,0 +1,918 @@ +/* + * Intel Multiprocessor Specification 1.1 and 1.4 + * compliant MP-table parsing routines. + * + * (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk> + * (c) 1998, 1999, 2000, 2009 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/memblock.h> +#include <linux/kernel_stat.h> +#include <linux/mc146818rtc.h> +#include <linux/bitops.h> +#include <linux/acpi.h> +#include <linux/module.h> +#include <linux/smp.h> +#include <linux/pci.h> +#include <linux/irqdomain.h> + +#include <asm/mtrr.h> +#include <asm/mpspec.h> +#include <asm/pgalloc.h> +#include <asm/io_apic.h> +#include <asm/proto.h> +#include <asm/bios_ebda.h> +#include <asm/e820.h> +#include <asm/setup.h> +#include <asm/smp.h> + +#include <asm/apic.h> +/* + * 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; +} + +int __init default_mpc_apic_id(struct mpc_cpu *m) +{ + return m->apicid; +} + +static void __init MP_processor_info(struct mpc_cpu *m) +{ + int apicid; + char *bootup_cpu = ""; + + if (!(m->cpuflag & CPU_ENABLED)) { + disabled_cpus++; + return; + } + + apicid = x86_init.mpparse.mpc_apic_id(m); + + if (m->cpuflag & CPU_BOOTPROCESSOR) { + bootup_cpu = " (Bootup-CPU)"; + boot_cpu_physical_apicid = m->apicid; + } + + pr_info("Processor #%d%s\n", m->apicid, bootup_cpu); + generic_processor_info(apicid, m->apicver); +} + +#ifdef CONFIG_X86_IO_APIC +void __init default_mpc_oem_bus_info(struct mpc_bus *m, char *str) +{ + memcpy(str, m->bustype, 6); + str[6] = 0; + apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str); +} + +static void __init MP_bus_info(struct mpc_bus *m) +{ + char str[7]; + + x86_init.mpparse.mpc_oem_bus_info(m, str); + +#if MAX_MP_BUSSES < 256 + if (m->busid >= MAX_MP_BUSSES) { + pr_warn("MP table busid value (%d) for bustype %s is too large, max. supported is %d\n", + m->busid, str, MAX_MP_BUSSES - 1); + return; + } +#endif + + set_bit(m->busid, mp_bus_not_pci); + if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) { +#ifdef CONFIG_EISA + mp_bus_id_to_type[m->busid] = MP_BUS_ISA; +#endif + } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) { + if (x86_init.mpparse.mpc_oem_pci_bus) + x86_init.mpparse.mpc_oem_pci_bus(m); + + clear_bit(m->busid, mp_bus_not_pci); +#ifdef CONFIG_EISA + mp_bus_id_to_type[m->busid] = MP_BUS_PCI; + } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) { + mp_bus_id_to_type[m->busid] = MP_BUS_EISA; +#endif + } else + pr_warn("Unknown bustype %s - ignoring\n", str); +} + +static struct irq_domain_ops mp_ioapic_irqdomain_ops = { + .map = mp_irqdomain_map, + .unmap = mp_irqdomain_unmap, +}; + +static void __init MP_ioapic_info(struct mpc_ioapic *m) +{ + struct ioapic_domain_cfg cfg = { + .type = IOAPIC_DOMAIN_LEGACY, + .ops = &mp_ioapic_irqdomain_ops, + }; + + if (m->flags & MPC_APIC_USABLE) + mp_register_ioapic(m->apicid, m->apicaddr, gsi_top, &cfg); +} + +static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq) +{ + apic_printk(APIC_VERBOSE, + "Int: type %d, pol %d, trig %d, bus %02x, IRQ %02x, APIC ID %x, APIC INT %02x\n", + mp_irq->irqtype, mp_irq->irqflag & 3, + (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus, + mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq); +} + +#else /* CONFIG_X86_IO_APIC */ +static inline void __init MP_bus_info(struct mpc_bus *m) {} +static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {} +#endif /* CONFIG_X86_IO_APIC */ + +static void __init MP_lintsrc_info(struct mpc_lintsrc *m) +{ + apic_printk(APIC_VERBOSE, + "Lint: type %d, pol %d, trig %d, bus %02x, IRQ %02x, APIC ID %x, APIC LINT %02x\n", + m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid, + m->srcbusirq, m->destapic, m->destapiclint); +} + +/* + * Read/parse the MPC + */ +static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str) +{ + + if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) { + pr_err("MPTABLE: bad signature [%c%c%c%c]!\n", + mpc->signature[0], mpc->signature[1], + mpc->signature[2], mpc->signature[3]); + return 0; + } + if (mpf_checksum((unsigned char *)mpc, mpc->length)) { + pr_err("MPTABLE: checksum error!\n"); + return 0; + } + if (mpc->spec != 0x01 && mpc->spec != 0x04) { + pr_err("MPTABLE: bad table version (%d)!!\n", mpc->spec); + return 0; + } + if (!mpc->lapic) { + pr_err("MPTABLE: null local APIC address!\n"); + return 0; + } + memcpy(oem, mpc->oem, 8); + oem[8] = 0; + pr_info("MPTABLE: OEM ID: %s\n", oem); + + memcpy(str, mpc->productid, 12); + str[12] = 0; + + pr_info("MPTABLE: Product ID: %s\n", str); + + pr_info("MPTABLE: APIC at: 0x%X\n", mpc->lapic); + + return 1; +} + +static void skip_entry(unsigned char **ptr, int *count, int size) +{ + *ptr += size; + *count += size; +} + +static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt) +{ + pr_err("Your mptable is wrong, contact your HW vendor!\n"); + pr_cont("type %x\n", *mpt); + print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16, + 1, mpc, mpc->length, 1); +} + +void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { } + +static int __init smp_read_mpc(struct mpc_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; + + /* Initialize the lapic mapping */ + if (!acpi_lapic) + register_lapic_address(mpc->lapic); + + if (early) + return 1; + + if (mpc->oemptr) + x86_init.mpparse.smp_read_mpc_oem(mpc); + + /* + * Now process the configuration blocks. + */ + x86_init.mpparse.mpc_record(0); + + while (count < mpc->length) { + switch (*mpt) { + case MP_PROCESSOR: + /* ACPI may have already provided this data */ + if (!acpi_lapic) + MP_processor_info((struct mpc_cpu *)mpt); + skip_entry(&mpt, &count, sizeof(struct mpc_cpu)); + break; + case MP_BUS: + MP_bus_info((struct mpc_bus *)mpt); + skip_entry(&mpt, &count, sizeof(struct mpc_bus)); + break; + case MP_IOAPIC: + MP_ioapic_info((struct mpc_ioapic *)mpt); + skip_entry(&mpt, &count, sizeof(struct mpc_ioapic)); + break; + case MP_INTSRC: + mp_save_irq((struct mpc_intsrc *)mpt); + skip_entry(&mpt, &count, sizeof(struct mpc_intsrc)); + break; + case MP_LINTSRC: + MP_lintsrc_info((struct mpc_lintsrc *)mpt); + skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc)); + break; + default: + /* wrong mptable */ + smp_dump_mptable(mpc, mpt); + count = mpc->length; + break; + } + x86_init.mpparse.mpc_record(1); + } + + if (!num_processors) + pr_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_intsrc intsrc; + int i; + int ELCR_fallback = 0; + + intsrc.type = MP_INTSRC; + intsrc.irqflag = 0; /* conforming */ + intsrc.srcbus = 0; + intsrc.dstapic = mpc_ioapic_id(0); + + intsrc.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) { + pr_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)) + pr_err("ELCR contains invalid data... not using ELCR\n"); + else { + pr_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.irqflag = 13; + else + intsrc.irqflag = 0; + } + + intsrc.srcbusirq = i; + intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */ + mp_save_irq(&intsrc); + } + + intsrc.irqtype = mp_ExtINT; + intsrc.srcbusirq = 0; + intsrc.dstirq = 0; /* 8259A to INTIN0 */ + mp_save_irq(&intsrc); +} + + +static void __init construct_ioapic_table(int mpc_default_type) +{ + struct mpc_ioapic ioapic; + struct mpc_bus bus; + + bus.type = MP_BUS; + bus.busid = 0; + switch (mpc_default_type) { + default: + pr_err("???\nUnknown standard configuration %d\n", + mpc_default_type); + /* fall through */ + case 1: + case 5: + memcpy(bus.bustype, "ISA ", 6); + break; + case 2: + case 6: + case 3: + memcpy(bus.bustype, "EISA ", 6); + break; + } + MP_bus_info(&bus); + if (mpc_default_type > 4) { + bus.busid = 1; + memcpy(bus.bustype, "PCI ", 6); + MP_bus_info(&bus); + } + + ioapic.type = MP_IOAPIC; + ioapic.apicid = 2; + ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01; + ioapic.flags = MPC_APIC_USABLE; + ioapic.apicaddr = IO_APIC_DEFAULT_PHYS_BASE; + 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 __init construct_ioapic_table(int mpc_default_type) { } +#endif + +static inline void __init construct_default_ISA_mptable(int mpc_default_type) +{ + struct mpc_cpu processor; + struct mpc_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.type = MP_PROCESSOR; + /* Either an integrated APIC or a discrete 82489DX. */ + processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01; + processor.cpuflag = CPU_ENABLED; + processor.cpufeature = (boot_cpu_data.x86 << 8) | + (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask; + processor.featureflag = boot_cpu_data.x86_capability[0]; + processor.reserved[0] = 0; + processor.reserved[1] = 0; + for (i = 0; i < 2; i++) { + processor.apicid = i; + MP_processor_info(&processor); + } + + construct_ioapic_table(mpc_default_type); + + lintsrc.type = MP_LINTSRC; + lintsrc.irqflag = 0; /* conforming */ + lintsrc.srcbusid = 0; + lintsrc.srcbusirq = 0; + lintsrc.destapic = MP_APIC_ALL; + for (i = 0; i < 2; i++) { + lintsrc.irqtype = linttypes[i]; + lintsrc.destapiclint = i; + MP_lintsrc_info(&lintsrc); + } +} + +static struct mpf_intel *mpf_found; + +static unsigned long __init get_mpc_size(unsigned long physptr) +{ + struct mpc_table *mpc; + unsigned long size; + + mpc = early_ioremap(physptr, PAGE_SIZE); + size = mpc->length; + early_iounmap(mpc, PAGE_SIZE); + apic_printk(APIC_VERBOSE, " mpc: %lx-%lx\n", physptr, physptr + size); + + return size; +} + +static int __init check_physptr(struct mpf_intel *mpf, unsigned int early) +{ + struct mpc_table *mpc; + unsigned long size; + + size = get_mpc_size(mpf->physptr); + mpc = early_ioremap(mpf->physptr, size); + /* + * Read the physical hardware table. Anything here will + * override the defaults. + */ + if (!smp_read_mpc(mpc, early)) { +#ifdef CONFIG_X86_LOCAL_APIC + smp_found_config = 0; +#endif + pr_err("BIOS bug, MP table errors detected!...\n"); + pr_cont("... disabling SMP support. (tell your hw vendor)\n"); + early_iounmap(mpc, size); + return -1; + } + early_iounmap(mpc, size); + + if (early) + return -1; + +#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_bus bus; + + pr_err("BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n"); + + bus.type = MP_BUS; + bus.busid = 0; + memcpy(bus.bustype, "ISA ", 6); + MP_bus_info(&bus); + + construct_default_ioirq_mptable(0); + } +#endif + + return 0; +} + +/* + * Scan the memory blocks for an SMP configuration block. + */ +void __init default_get_smp_config(unsigned int early) +{ + struct mpf_intel *mpf = mpf_found; + + if (!mpf) + return; + + if (acpi_lapic && early) + return; + + /* + * MPS doesn't support hyperthreading, aka only have + * thread 0 apic id in MPS table + */ + if (acpi_lapic && acpi_ioapic) + return; + + pr_info("Intel MultiProcessor Specification v1.%d\n", + mpf->specification); +#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32) + if (mpf->feature2 & (1 << 7)) { + pr_info(" IMCR and PIC compatibility mode.\n"); + pic_mode = 1; + } else { + pr_info(" Virtual Wire compatibility mode.\n"); + pic_mode = 0; + } +#endif + /* + * Now see if we need to read further. + */ + if (mpf->feature1 != 0) { + if (early) { + /* + * local APIC has default address + */ + mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; + return; + } + + pr_info("Default MP configuration #%d\n", mpf->feature1); + construct_default_ISA_mptable(mpf->feature1); + + } else if (mpf->physptr) { + if (check_physptr(mpf, early)) + return; + } else + BUG(); + + if (!early) + pr_info("Processors: %d\n", num_processors); + /* + * Only use the first configuration found. + */ +} + +static void __init smp_reserve_memory(struct mpf_intel *mpf) +{ + memblock_reserve(mpf->physptr, get_mpc_size(mpf->physptr)); +} + +static int __init smp_scan_config(unsigned long base, unsigned long length) +{ + unsigned int *bp = phys_to_virt(base); + struct mpf_intel *mpf; + unsigned long mem; + + apic_printk(APIC_VERBOSE, "Scan for SMP in [mem %#010lx-%#010lx]\n", + base, base + length - 1); + BUILD_BUG_ON(sizeof(*mpf) != 16); + + while (length > 0) { + mpf = (struct mpf_intel *)bp; + if ((*bp == SMP_MAGIC_IDENT) && + (mpf->length == 1) && + !mpf_checksum((unsigned char *)bp, 16) && + ((mpf->specification == 1) + || (mpf->specification == 4))) { +#ifdef CONFIG_X86_LOCAL_APIC + smp_found_config = 1; +#endif + mpf_found = mpf; + + pr_info("found SMP MP-table at [mem %#010llx-%#010llx] mapped at [%p]\n", + (unsigned long long) virt_to_phys(mpf), + (unsigned long long) virt_to_phys(mpf) + + sizeof(*mpf) - 1, mpf); + + mem = virt_to_phys(mpf); + memblock_reserve(mem, sizeof(*mpf)); + if (mpf->physptr) + smp_reserve_memory(mpf); + + return 1; + } + bp += 4; + length -= 16; + } + return 0; +} + +void __init default_find_smp_config(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 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); +} + +#ifdef CONFIG_X86_IO_APIC +static u8 __initdata irq_used[MAX_IRQ_SOURCES]; + +static int __init get_MP_intsrc_index(struct mpc_intsrc *m) +{ + int i; + + if (m->irqtype != mp_INT) + return 0; + + if (m->irqflag != 0x0f) + return 0; + + /* not legacy */ + + for (i = 0; i < mp_irq_entries; i++) { + if (mp_irqs[i].irqtype != mp_INT) + continue; + + if (mp_irqs[i].irqflag != 0x0f) + continue; + + if (mp_irqs[i].srcbus != m->srcbus) + continue; + if (mp_irqs[i].srcbusirq != m->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_intsrc __initdata *m_spare[SPARE_SLOT_NUM]; + +static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) +{ + int i; + + apic_printk(APIC_VERBOSE, "OLD "); + print_mp_irq_info(m); + + i = get_MP_intsrc_index(m); + if (i > 0) { + memcpy(m, &mp_irqs[i], sizeof(*m)); + apic_printk(APIC_VERBOSE, "NEW "); + print_mp_irq_info(&mp_irqs[i]); + return; + } + if (!i) { + /* legacy, do nothing */ + return; + } + 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 += 1; + } +} + +static int __init +check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count) +{ + if (!mpc_new_phys || count <= mpc_new_length) { + WARN(1, "update_mptable: No spare slots (length: %x)\n", count); + return -1; + } + + return 0; +} +#else /* CONFIG_X86_IO_APIC */ +static +inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {} +#endif /* CONFIG_X86_IO_APIC */ + +static int __init replace_intsrc_all(struct mpc_table *mpc, + unsigned long mpc_new_phys, + unsigned long mpc_new_length) +{ +#ifdef CONFIG_X86_IO_APIC + int i; +#endif + int count = sizeof(*mpc); + int nr_m_spare = 0; + unsigned char *mpt = ((unsigned char *)mpc) + count; + + pr_info("mpc_length %x\n", mpc->length); + while (count < mpc->length) { + switch (*mpt) { + case MP_PROCESSOR: + skip_entry(&mpt, &count, sizeof(struct mpc_cpu)); + break; + case MP_BUS: + skip_entry(&mpt, &count, sizeof(struct mpc_bus)); + break; + case MP_IOAPIC: + skip_entry(&mpt, &count, sizeof(struct mpc_ioapic)); + break; + case MP_INTSRC: + check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare); + skip_entry(&mpt, &count, sizeof(struct mpc_intsrc)); + break; + case MP_LINTSRC: + skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc)); + break; + default: + /* wrong mptable */ + smp_dump_mptable(mpc, mpt); + goto out; + } + } + +#ifdef CONFIG_X86_IO_APIC + for (i = 0; i < mp_irq_entries; i++) { + if (irq_used[i]) + continue; + + if (mp_irqs[i].irqtype != mp_INT) + continue; + + if (mp_irqs[i].irqflag != 0x0f) + continue; + + if (nr_m_spare > 0) { + apic_printk(APIC_VERBOSE, "*NEW* found\n"); + nr_m_spare--; + memcpy(m_spare[nr_m_spare], &mp_irqs[i], sizeof(mp_irqs[i])); + m_spare[nr_m_spare] = NULL; + } else { + struct mpc_intsrc *m = (struct mpc_intsrc *)mpt; + count += sizeof(struct mpc_intsrc); + if (check_slot(mpc_new_phys, mpc_new_length, count) < 0) + goto out; + memcpy(m, &mp_irqs[i], sizeof(*m)); + mpc->length = count; + mpt += sizeof(struct mpc_intsrc); + } + print_mp_irq_info(&mp_irqs[i]); + } +#endif +out: + /* update checksum */ + mpc->checksum = 0; + mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length); + + return 0; +} + +int enable_update_mptable; + +static int __init update_mptable_setup(char *str) +{ + enable_update_mptable = 1; +#ifdef CONFIG_PCI + pci_routeirq = 1; +#endif + 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; +#ifdef CONFIG_PCI + pci_routeirq = 1; +#endif + 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) + mpc_new_phys = early_reserve_e820(mpc_new_length, 4); +} + +static int __init update_mp_table(void) +{ + char str[16]; + char oem[10]; + struct mpf_intel *mpf; + struct mpc_table *mpc, *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->feature1 != 0) + return 0; + + if (!mpf->physptr) + return 0; + + mpc = phys_to_virt(mpf->physptr); + + if (!smp_check_mpc(mpc, oem, str)) + return 0; + + pr_info("mpf: %llx\n", (u64)virt_to_phys(mpf)); + pr_info("physptr: %x\n", mpf->physptr); + + if (mpc_new_phys && mpc->length > mpc_new_length) { + mpc_new_phys = 0; + pr_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 position */ + mpc->checksum = 0; + old = mpf_checksum((unsigned char *)mpc, mpc->length); + mpc->checksum = 0xff; + new = mpf_checksum((unsigned char *)mpc, mpc->length); + if (old == new) { + pr_info("mpc is readonly, please try alloc_mptable instead\n"); + return 0; + } + pr_info("use in-position replacing\n"); + } else { + mpf->physptr = mpc_new_phys; + mpc_new = phys_to_virt(mpc_new_phys); + memcpy(mpc_new, mpc, mpc->length); + mpc = mpc_new; + /* check if we can modify that */ + if (mpc_new_phys - mpf->physptr) { + struct mpf_intel *mpf_new; + /* steal 16 bytes from [0, 1k) */ + pr_info("mpf new: %x\n", 0x400 - 16); + mpf_new = phys_to_virt(0x400 - 16); + memcpy(mpf_new, mpf, 16); + mpf = mpf_new; + mpf->physptr = mpc_new_phys; + } + mpf->checksum = 0; + mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16); + pr_info("physptr new: %x\n", 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); |