1 /* 2 * Copyright (c) 2003-2004 Fabrice Bellard 3 * Copyright (c) 2019, 2024 Red Hat, Inc. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a copy 6 * of this software and associated documentation files (the "Software"), to deal 7 * in the Software without restriction, including without limitation the rights 8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 * copies of the Software, and to permit persons to whom the Software is 10 * furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be included in 13 * all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 21 * THE SOFTWARE. 22 */ 23 #include "qemu/osdep.h" 24 #include "sysemu/whpx.h" 25 #include "sysemu/cpu-timers.h" 26 #include "trace.h" 27 28 #include "hw/i386/x86.h" 29 #include "target/i386/cpu.h" 30 #include "hw/intc/i8259.h" 31 #include "hw/irq.h" 32 #include "sysemu/kvm.h" 33 34 /* TSC handling */ 35 uint64_t cpu_get_tsc(CPUX86State *env) 36 { 37 return cpus_get_elapsed_ticks(); 38 } 39 40 /* IRQ handling */ 41 static void pic_irq_request(void *opaque, int irq, int level) 42 { 43 CPUState *cs = first_cpu; 44 X86CPU *cpu = X86_CPU(cs); 45 46 trace_x86_pic_interrupt(irq, level); 47 if (cpu_is_apic_enabled(cpu->apic_state) && !kvm_irqchip_in_kernel() && 48 !whpx_apic_in_platform()) { 49 CPU_FOREACH(cs) { 50 cpu = X86_CPU(cs); 51 if (apic_accept_pic_intr(cpu->apic_state)) { 52 apic_deliver_pic_intr(cpu->apic_state, level); 53 } 54 } 55 } else { 56 if (level) { 57 cpu_interrupt(cs, CPU_INTERRUPT_HARD); 58 } else { 59 cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); 60 } 61 } 62 } 63 64 qemu_irq x86_allocate_cpu_irq(void) 65 { 66 return qemu_allocate_irq(pic_irq_request, NULL, 0); 67 } 68 69 int cpu_get_pic_interrupt(CPUX86State *env) 70 { 71 X86CPU *cpu = env_archcpu(env); 72 int intno; 73 74 if (!kvm_irqchip_in_kernel() && !whpx_apic_in_platform()) { 75 intno = apic_get_interrupt(cpu->apic_state); 76 if (intno >= 0) { 77 return intno; 78 } 79 /* read the irq from the PIC */ 80 if (!apic_accept_pic_intr(cpu->apic_state)) { 81 return -1; 82 } 83 } 84 85 intno = pic_read_irq(isa_pic); 86 return intno; 87 } 88 89 DeviceState *cpu_get_current_apic(void) 90 { 91 if (current_cpu) { 92 X86CPU *cpu = X86_CPU(current_cpu); 93 return cpu->apic_state; 94 } else { 95 return NULL; 96 } 97 } 98