From f9c1841d7699ecc04f9ce4499f1c081ae50aa225 Mon Sep 17 00:00:00 2001
From: Lee Lup Yuen <luppy@appkaki.com>
Date: Sat, 20 Jan 2024 10:29:01 +0800
Subject: [PATCH] Clear the interrupt after setting BL808_UART_INT_CLEAR
 (0x30002028)

---
 riscv_cpu.c | 11 ++++++-----
 virtio.c    | 17 +++++++++++++++--
 2 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/riscv_cpu.c b/riscv_cpu.c
index 4c69404..476baca 100644
--- a/riscv_cpu.c
+++ b/riscv_cpu.c
@@ -496,11 +496,12 @@ int target_write_slow(RISCVCPUState *s, target_ulong addr,
                 print_console(NULL, buf, 1);
                 break;
             }
-
             // Console Input: Clear the interrupt after setting BL808_UART_INT_CLEAR (0x30002028)
-            // case 0x30002028:
-            //     break;
-
+            case 0x30002028: {
+                void virtio_ack_irq(void *device0);
+                virtio_ack_irq(NULL);
+                break;
+            }
             default:  // Unknown Memory-Mapped I/O
 #ifdef DUMP_INVALID_MEM_ACCESS
                 printf("target_write_slow: invalid physical address 0x");
@@ -1171,7 +1172,7 @@ static void raise_exception(RISCVCPUState *s, uint32_t cause)
 {
     printf("raise_exception: cause=%d\n", cause);////
     #ifndef EMSCRIPTEN ////
-    printf("raise_exception: sleep\n"); sleep(4);////
+    // printf("raise_exception: sleep\n"); sleep(4);////
     #endif  //// EMSCRIPTEN
     raise_exception2(s, cause, 0);
 }
diff --git a/virtio.c b/virtio.c
index a586cee..0e9c73a 100644
--- a/virtio.c
+++ b/virtio.c
@@ -158,6 +158,7 @@ static void virtio_mmio_write(void *opaque, uint32_t offset,
 static uint32_t virtio_pci_read(void *opaque, uint32_t offset, int size_log2);
 static void virtio_pci_write(void *opaque, uint32_t offset,
                              uint32_t val, int size_log2);
+void virtio_ack_irq(VIRTIODevice *device0);
 
 static void virtio_reset(VIRTIODevice *s)
 {
@@ -293,6 +294,7 @@ static void virtio_init(VIRTIODevice *s, VIRTIOBusDef *bus,
     s->config_space_size = config_space_size;
     s->device_recv = device_recv;
     virtio_reset(s);
+    virtio_ack_irq(s); ////
 }
 
 static uint16_t virtio_read16(VIRTIODevice *s, virtio_phys_addr_t addr)
@@ -1337,8 +1339,6 @@ int virtio_console_write_data(VIRTIODevice *s, const uint8_t *buf, int buf_len)
     s->int_status |= 1;
     set_irq(s->irq, 1);
 
-    // TODO: Clear the interrupt after reading keypress
-    // set_irq(s->irq, 0);
 #ifdef NOTUSED
     int queue_idx = 0;
     QueueState *qs = &s->queue[queue_idx];
@@ -2678,3 +2678,16 @@ VIRTIODevice *virtio_9p_init(VIRTIOBusDef *bus, FSDevice *fs,
     return (VIRTIODevice *)s;
 }
 
+//// Begin Test: Acknowledge VirtIO Interrupt
+void virtio_ack_irq(VIRTIODevice *device0) {
+    static VIRTIODevice *device = NULL;
+    if (device0 != NULL) { device = device0; return; }
+    if (device == NULL) { puts("virtio_ack_irq: Missing device"); }
+
+    puts("virtio_ack_irq");
+    // device->int_status &= ~val;
+    // if (device->int_status == 0) {
+        set_irq(device->irq, 0);
+    // }
+}
+//// End Test