// SPDX-License-Identifier: GPL-2.0 /* * Intel Multiprocessor Specification 1.1 and 1.4 * compliant MP-table parsing routines. * * (c) 1995 Alan Cox, Building #3 * (c) 1998, 1999, 2000, 2009 Ingo Molnar * (c) 2008 Alexey Starikovskiy */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * 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; } static void __init MP_processor_info(struct mpc_cpu *m) { int apicid; char *bootup_cpu = ""; if (!(m->cpuflag & CPU_ENABLED)) { disabled_cpus++; return; } apicid = m->apicid; 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 static void __init 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]; 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) { 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 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); } 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; /* Now process the configuration blocks. */ 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; } } 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 = PIC_ELCR1 + (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 = MP_IRQTRIG_DEFAULT | MP_IRQPOL_DEFAULT; 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 */ fallthrough; 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 = MP_IRQTRIG_LEVEL | MP_IRQPOL_ACTIVE_HIGH; } else { intsrc.irqflag = MP_IRQTRIG_DEFAULT | MP_IRQPOL_DEFAULT; } } 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); fallthrough; 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_stepping; processor.featureflag = boot_cpu_data.x86_capability[CPUID_1_EDX]; 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 = MP_IRQTRIG_DEFAULT | MP_IRQPOL_DEFAULT; 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 unsigned long mpf_base; static bool mpf_found; static unsigned long __init get_mpc_size(unsigned long physptr) { struct mpc_table *mpc; unsigned long size; mpc = early_memremap(physptr, PAGE_SIZE); size = mpc->length; early_memunmap(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_memremap(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_memunmap(mpc, size); return -1; } early_memunmap(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; if (!smp_found_config) return; if (!mpf_found) 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; mpf = early_memremap(mpf_base, sizeof(*mpf)); if (!mpf) { pr_err("MPTABLE: error mapping MP table\n"); 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) { if (early) { /* * local APIC has default address */ mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; goto out; } pr_info("Default MP configuration #%d\n", mpf->feature1); construct_default_ISA_mptable(mpf->feature1); } else if (mpf->physptr) { if (check_physptr(mpf, early)) goto out; } else BUG(); if (!early) pr_info("Processors: %d\n", num_processors); /* * Only use the first configuration found. */ out: early_memunmap(mpf, sizeof(*mpf)); } 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; struct mpf_intel *mpf; int ret = 0; 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) { bp = early_memremap(base, length); 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_base = base; mpf_found = true; pr_info("found SMP MP-table at [mem %#010lx-%#010lx]\n", base, base + sizeof(*mpf) - 1); memblock_reserve(base, sizeof(*mpf)); if (mpf->physptr) smp_reserve_memory(mpf); ret = 1; } early_memunmap(bp, length); if (ret) break; base += 16; length -= 16; } return ret; } 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 != (MP_IRQTRIG_LEVEL | MP_IRQPOL_ACTIVE_LOW)) 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 != (MP_IRQTRIG_LEVEL | MP_IRQPOL_ACTIVE_LOW)) 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 != (MP_IRQTRIG_LEVEL | MP_IRQPOL_ACTIVE_LOW)) 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 e820__memblock_alloc_reserved_mpc_new(void) { if (enable_update_mptable && alloc_mptable) mpc_new_phys = e820__memblock_alloc_reserved(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; unsigned long size; if (!enable_update_mptable) return 0; if (!mpf_found) return 0; mpf = early_memremap(mpf_base, sizeof(*mpf)); if (!mpf) { pr_err("MPTABLE: mpf early_memremap() failed\n"); return 0; } /* * Now see if we need to go further. */ if (mpf->feature1) goto do_unmap_mpf; if (!mpf->physptr) goto do_unmap_mpf; size = get_mpc_size(mpf->physptr); mpc = early_memremap(mpf->physptr, size); if (!mpc) { pr_err("MPTABLE: mpc early_memremap() failed\n"); goto do_unmap_mpf; } if (!smp_check_mpc(mpc, oem, str)) goto do_unmap_mpc; pr_info("mpf: %llx\n", (u64)mpf_base); 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"); goto do_unmap_mpc; } pr_info("use in-position replacing\n"); } else { mpc_new = early_memremap(mpc_new_phys, mpc_new_length); if (!mpc_new) { pr_err("MPTABLE: new mpc early_memremap() failed\n"); goto do_unmap_mpc; } mpf->physptr = mpc_new_phys; memcpy(mpc_new, mpc, mpc->length); early_memunmap(mpc, size); mpc = mpc_new; size = mpc_new_length; /* check if we can modify that */ if (mpc_new_phys - mpf->physptr) { struct mpf_intel *mpf_new; /* steal 16 bytes from [0, 1k) */ mpf_new = early_memremap(0x400 - 16, sizeof(*mpf_new)); if (!mpf_new) { pr_err("MPTABLE: new mpf early_memremap() failed\n"); goto do_unmap_mpc; } pr_info("mpf new: %x\n", 0x400 - 16); memcpy(mpf_new, mpf, 16); early_memunmap(mpf, sizeof(*mpf)); 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); do_unmap_mpc: early_memunmap(mpc, size); do_unmap_mpf: early_memunmap(mpf, sizeof(*mpf)); return 0; } late_initcall(update_mp_table);