| 1 | |
| 2 | |
| 3 | * ACRN detection support
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| 4 | *
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| 5 | * Copyright (C) 2019 Intel Corporation. All rights reserved.
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| 6 | *
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| 7 | * Jason Chen CJ <[email protected]>
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| 8 | * Zhao Yakui <[email protected]>
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| 9 | *
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| 10 |
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| 11 |
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| 12 | #include <linux/interrupt.h>
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| 13 |
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| 14 | #include <asm/acrn.h>
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| 15 | #include <asm/apic.h>
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| 16 | #include <asm/cpufeatures.h>
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| 17 | #include <asm/desc.h>
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| 18 | #include <asm/hypervisor.h>
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| 19 | #include <asm/idtentry.h>
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| 20 | #include <asm/irq_regs.h>
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| 21 |
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| 22 | static u32 __init acrn_detect(void)
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| 23 | {
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| 24 | return acrn_cpuid_base();
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| 25 | }
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| 26 |
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| 27 | static void __init acrn_init_platform(void)
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| 28 | {
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| 29 |
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| 30 | sysvec_install(HYPERVISOR_CALLBACK_VECTOR, sysvec_acrn_hv_callback);
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| 31 |
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| 32 | x86_platform.calibrate_tsc = acrn_get_tsc_khz;
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| 33 | x86_platform.calibrate_cpu = acrn_get_tsc_khz;
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| 34 | }
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| 35 |
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| 36 | static bool acrn_x2apic_available(void)
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| 37 | {
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| 38 | return boot_cpu_has(X86_FEATURE_X2APIC);
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| 39 | }
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| 40 |
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| 41 | static void (*acrn_intr_handler)(void);
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| 42 |
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| 43 | DEFINE_IDTENTRY_SYSVEC(sysvec_acrn_hv_callback)
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| 44 | {
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| 45 | struct pt_regs *old_regs = set_irq_regs(regs);
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| 46 |
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| 47 | |
| 48 | * The hypervisor requires that the APIC EOI should be acked.
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| 49 | * If the APIC EOI is not acked, the APIC ISR bit for the
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| 50 | * HYPERVISOR_CALLBACK_VECTOR will not be cleared and then it
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| 51 | * will block the interrupt whose vector is lower than
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| 52 | * HYPERVISOR_CALLBACK_VECTOR.
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| 53 |
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| 54 | apic_eoi();
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| 55 | inc_irq_stat(HYPERVISOR_CALLBACK);
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| 56 |
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| 57 | if (acrn_intr_handler)
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| 58 | acrn_intr_handler();
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| 59 |
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| 60 | set_irq_regs(old_regs);
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| 61 | }
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| 62 |
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| 63 | void acrn_setup_intr_handler(void (*handler)(void))
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| 64 | {
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| 65 | acrn_intr_handler = handler;
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| 66 | }
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| 67 | EXPORT_SYMBOL_GPL(acrn_setup_intr_handler);
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| 68 |
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| 69 | void acrn_remove_intr_handler(void)
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| 70 | {
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| 71 | acrn_intr_handler = NULL;
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| 72 | }
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| 73 | EXPORT_SYMBOL_GPL(acrn_remove_intr_handler);
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| 74 |
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| 75 | const __initconst struct hypervisor_x86 x86_hyper_acrn = {
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| 76 | .name = "ACRN",
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| 77 | .detect = acrn_detect,
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| 78 | .type = X86_HYPER_ACRN,
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| 79 | .init.init_platform = acrn_init_platform,
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| 80 | .init.x2apic_available = acrn_x2apic_available,
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| 81 | };
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