Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * ACRN detection support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2019 Intel Corporation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Jason Chen CJ <jason.cj.chen@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * Zhao Yakui <yakui.zhao@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/apic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/cpufeatures.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/desc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/hypervisor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/idtentry.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/irq_regs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static u32 __init acrn_detect(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	return hypervisor_cpuid_base("ACRNACRNACRN", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static void __init acrn_init_platform(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	/* Setup the IDT for ACRN hypervisor callback */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_acrn_hv_callback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static bool acrn_x2apic_available(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	return boot_cpu_has(X86_FEATURE_X2APIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void (*acrn_intr_handler)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) DEFINE_IDTENTRY_SYSVEC(sysvec_acrn_hv_callback)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	struct pt_regs *old_regs = set_irq_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	 * The hypervisor requires that the APIC EOI should be acked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	 * If the APIC EOI is not acked, the APIC ISR bit for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	 * HYPERVISOR_CALLBACK_VECTOR will not be cleared and then it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	 * will block the interrupt whose vector is lower than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	 * HYPERVISOR_CALLBACK_VECTOR.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	ack_APIC_irq();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	inc_irq_stat(irq_hv_callback_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	if (acrn_intr_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		acrn_intr_handler();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	set_irq_regs(old_regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) const __initconst struct hypervisor_x86 x86_hyper_acrn = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	.name                   = "ACRN",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	.detect                 = acrn_detect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	.type			= X86_HYPER_ACRN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	.init.init_platform     = acrn_init_platform,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	.init.x2apic_available  = acrn_x2apic_available,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) };