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247 lines
6.3 KiB
247 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2004 James Cleverdon, IBM. |
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* |
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* Flat APIC subarch code. |
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* |
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* Hacked for x86-64 by James Cleverdon from i386 architecture code by |
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* Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and |
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* James Cleverdon. |
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*/ |
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#include <linux/cpumask.h> |
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#include <linux/export.h> |
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#include <linux/acpi.h> |
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#include <asm/jailhouse_para.h> |
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#include <asm/apic.h> |
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#include "local.h" |
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static struct apic apic_physflat; |
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static struct apic apic_flat; |
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struct apic *apic __ro_after_init = &apic_flat; |
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EXPORT_SYMBOL_GPL(apic); |
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static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) |
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{ |
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return 1; |
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} |
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/* |
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* Set up the logical destination ID. |
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* |
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* Intel recommends to set DFR, LDR and TPR before enabling |
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* an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel |
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* document number 292116). So here it goes... |
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*/ |
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void flat_init_apic_ldr(void) |
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{ |
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unsigned long val; |
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unsigned long num, id; |
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num = smp_processor_id(); |
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id = 1UL << num; |
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apic_write(APIC_DFR, APIC_DFR_FLAT); |
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val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; |
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val |= SET_APIC_LOGICAL_ID(id); |
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apic_write(APIC_LDR, val); |
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} |
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static void _flat_send_IPI_mask(unsigned long mask, int vector) |
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{ |
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unsigned long flags; |
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local_irq_save(flags); |
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__default_send_IPI_dest_field(mask, vector, APIC_DEST_LOGICAL); |
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local_irq_restore(flags); |
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} |
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static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector) |
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{ |
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unsigned long mask = cpumask_bits(cpumask)[0]; |
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_flat_send_IPI_mask(mask, vector); |
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} |
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static void |
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flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) |
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{ |
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unsigned long mask = cpumask_bits(cpumask)[0]; |
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int cpu = smp_processor_id(); |
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if (cpu < BITS_PER_LONG) |
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__clear_bit(cpu, &mask); |
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_flat_send_IPI_mask(mask, vector); |
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} |
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static unsigned int flat_get_apic_id(unsigned long x) |
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{ |
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return (x >> 24) & 0xFF; |
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} |
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static u32 set_apic_id(unsigned int id) |
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{ |
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return (id & 0xFF) << 24; |
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} |
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static unsigned int read_xapic_id(void) |
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{ |
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return flat_get_apic_id(apic_read(APIC_ID)); |
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} |
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static int flat_apic_id_registered(void) |
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{ |
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return physid_isset(read_xapic_id(), phys_cpu_present_map); |
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} |
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static int flat_phys_pkg_id(int initial_apic_id, int index_msb) |
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{ |
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return initial_apic_id >> index_msb; |
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} |
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static int flat_probe(void) |
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{ |
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return 1; |
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} |
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static struct apic apic_flat __ro_after_init = { |
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.name = "flat", |
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.probe = flat_probe, |
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.acpi_madt_oem_check = flat_acpi_madt_oem_check, |
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.apic_id_valid = default_apic_id_valid, |
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.apic_id_registered = flat_apic_id_registered, |
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.delivery_mode = APIC_DELIVERY_MODE_FIXED, |
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.dest_mode_logical = true, |
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.disable_esr = 0, |
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.check_apicid_used = NULL, |
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.init_apic_ldr = flat_init_apic_ldr, |
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.ioapic_phys_id_map = NULL, |
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.setup_apic_routing = NULL, |
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.cpu_present_to_apicid = default_cpu_present_to_apicid, |
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.apicid_to_cpu_present = NULL, |
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.check_phys_apicid_present = default_check_phys_apicid_present, |
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.phys_pkg_id = flat_phys_pkg_id, |
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.get_apic_id = flat_get_apic_id, |
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.set_apic_id = set_apic_id, |
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.calc_dest_apicid = apic_flat_calc_apicid, |
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.send_IPI = default_send_IPI_single, |
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.send_IPI_mask = flat_send_IPI_mask, |
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.send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself, |
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.send_IPI_allbutself = default_send_IPI_allbutself, |
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.send_IPI_all = default_send_IPI_all, |
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.send_IPI_self = default_send_IPI_self, |
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.inquire_remote_apic = default_inquire_remote_apic, |
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.read = native_apic_mem_read, |
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.write = native_apic_mem_write, |
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.eoi_write = native_apic_mem_write, |
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.icr_read = native_apic_icr_read, |
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.icr_write = native_apic_icr_write, |
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.wait_icr_idle = native_apic_wait_icr_idle, |
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.safe_wait_icr_idle = native_safe_apic_wait_icr_idle, |
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}; |
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/* |
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* Physflat mode is used when there are more than 8 CPUs on a system. |
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* We cannot use logical delivery in this case because the mask |
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* overflows, so use physical mode. |
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*/ |
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static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) |
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{ |
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#ifdef CONFIG_ACPI |
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/* |
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* Quirk: some x86_64 machines can only use physical APIC mode |
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* regardless of how many processors are present (x86_64 ES7000 |
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* is an example). |
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*/ |
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if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && |
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(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { |
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printk(KERN_DEBUG "system APIC only can use physical flat"); |
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return 1; |
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} |
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if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) { |
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printk(KERN_DEBUG "IBM Summit detected, will use apic physical"); |
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return 1; |
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} |
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#endif |
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return 0; |
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} |
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static void physflat_init_apic_ldr(void) |
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{ |
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/* |
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* LDR and DFR are not involved in physflat mode, rather: |
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* "In physical destination mode, the destination processor is |
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* specified by its local APIC ID [...]." (Intel SDM, 10.6.2.1) |
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*/ |
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} |
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static int physflat_probe(void) |
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{ |
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if (apic == &apic_physflat || num_possible_cpus() > 8 || |
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jailhouse_paravirt()) |
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return 1; |
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return 0; |
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} |
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static struct apic apic_physflat __ro_after_init = { |
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.name = "physical flat", |
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.probe = physflat_probe, |
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.acpi_madt_oem_check = physflat_acpi_madt_oem_check, |
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.apic_id_valid = default_apic_id_valid, |
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.apic_id_registered = flat_apic_id_registered, |
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.delivery_mode = APIC_DELIVERY_MODE_FIXED, |
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.dest_mode_logical = false, |
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.disable_esr = 0, |
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.check_apicid_used = NULL, |
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.init_apic_ldr = physflat_init_apic_ldr, |
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.ioapic_phys_id_map = NULL, |
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.setup_apic_routing = NULL, |
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.cpu_present_to_apicid = default_cpu_present_to_apicid, |
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.apicid_to_cpu_present = NULL, |
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.check_phys_apicid_present = default_check_phys_apicid_present, |
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.phys_pkg_id = flat_phys_pkg_id, |
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.get_apic_id = flat_get_apic_id, |
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.set_apic_id = set_apic_id, |
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.calc_dest_apicid = apic_default_calc_apicid, |
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.send_IPI = default_send_IPI_single_phys, |
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.send_IPI_mask = default_send_IPI_mask_sequence_phys, |
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.send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_phys, |
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.send_IPI_allbutself = default_send_IPI_allbutself, |
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.send_IPI_all = default_send_IPI_all, |
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.send_IPI_self = default_send_IPI_self, |
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.inquire_remote_apic = default_inquire_remote_apic, |
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.read = native_apic_mem_read, |
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.write = native_apic_mem_write, |
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.eoi_write = native_apic_mem_write, |
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.icr_read = native_apic_icr_read, |
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.icr_write = native_apic_icr_write, |
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.wait_icr_idle = native_apic_wait_icr_idle, |
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.safe_wait_icr_idle = native_safe_apic_wait_icr_idle, |
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}; |
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/* |
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* We need to check for physflat first, so this order is important. |
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*/ |
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apic_drivers(apic_physflat, apic_flat);
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