| /* |
| * Copyright 2018 Google LLC |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * https://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <stdalign.h> |
| #include <stdint.h> |
| |
| #include "hf/arch/vm/interrupts_gicv3.h" |
| |
| #include "hf/dlog.h" |
| #include "hf/mm.h" |
| #include "hf/std.h" |
| |
| #include "vmapi/hf/call.h" |
| |
| #include "../msr.h" |
| |
| /* |
| * Secondary VM that sends messages in response to interrupts, and interrupts |
| * itself when it receives a message. |
| */ |
| |
| #define DESTINATION_VM_ID 0 |
| #define SELF_INTERRUPT_ID 5 |
| |
| alignas(4096) uint8_t kstack[4096]; |
| |
| static alignas(PAGE_SIZE) uint8_t send_page[PAGE_SIZE]; |
| static alignas(PAGE_SIZE) uint8_t recv_page[PAGE_SIZE]; |
| |
| static hf_ipaddr_t send_page_addr = (hf_ipaddr_t)send_page; |
| static hf_ipaddr_t recv_page_addr = (hf_ipaddr_t)recv_page; |
| |
| static struct hf_mailbox_receive_return received_message; |
| |
| void irq_current(void) |
| { |
| uint32_t interrupt_id = hf_get_and_acknowledge_interrupt(); |
| char buffer[] = "Got IRQ xx."; |
| int size = sizeof(buffer); |
| dlog("IRQ %d from current\n", interrupt_id); |
| buffer[8] = '0' + interrupt_id / 10; |
| buffer[9] = '0' + interrupt_id % 10; |
| memcpy(send_page, buffer, size); |
| hf_mailbox_send(DESTINATION_VM_ID, size); |
| } |
| |
| void kmain(void) |
| { |
| hf_vm_configure(send_page_addr, recv_page_addr); |
| |
| exception_setup(); |
| hf_enable_interrupt(SELF_INTERRUPT_ID, true); |
| arch_irq_enable(); |
| |
| /* Loop, echo messages back to the sender. */ |
| for (;;) { |
| received_message = hf_mailbox_receive(true); |
| hf_mailbox_clear(); |
| /* Interrupt ourselves */ |
| hf_inject_interrupt(4, 0, SELF_INTERRUPT_ID); |
| } |
| } |