From ac151ef588456ae49d0abf4077f00a4e1a9e8c4a Mon Sep 17 00:00:00 2001
From: Ivan Baravy <dunkaist@gmail.com>
Date: Sun, 26 Jun 2022 23:57:02 +0400
Subject: [PATCH] [umka_os/linux] Simulate hw interrupts via signals

---
 umka.asm  | 21 +++++++++++++++++++++
 umka.h    |  6 ++++++
 umka_os.c | 16 ++++++++++++++++
 vnet.c    |  8 ++++++++
 4 files changed, 51 insertions(+)

diff --git a/umka.asm b/umka.asm
index a8df4d1..416e338 100644
--- a/umka.asm
+++ b/umka.asm
@@ -79,6 +79,8 @@ UMKA_OS    = 3
 
 UMKA_MEMORY_BYTES = 256 SHL 20
 
+pubsym irq_serv.irq_10, 'kos_irq_serv_irq10'
+pubsym attach_int_handler, 'kos_attach_int_handler', 12
 pubsym fs_execute, 'kos_fs_execute'
 pubsym set_keyboard_data, 'kos_set_keyboard_data'
 pubsym KEY_COUNT as 'kos_key_count'
@@ -191,6 +193,7 @@ macro sti {
 }
 
 iretd equ retd
+iret equ ret
 
 lang fix en
 
@@ -383,7 +386,15 @@ purge call
 ;include 'core/exports.inc'
 include 'core/string.inc'
 ;include 'core/v86.inc'
+macro mov dst, src {
+  if dst eq ds
+  else if dst eq es
+  else
+        mov     dst, src
+  end if
+}
 include 'core/irq.inc'
+purge mov
 include 'core/apic.inc'
 include 'core/hpet.inc'
 include 'core/timers.inc'
@@ -535,6 +546,10 @@ proc umka_init c uses ebx esi edi ebp
 ;        call    mem_test
 ;        call    init_mem
 ;        call    init_page_map
+        mov     [irq_mode], IRQ_APIC
+        mov     [IOAPIC_base], ioapic_data
+        mov     [LAPIC_BASE], lapic_data
+        mov     [ioapic_cnt], 1
 
         mov     [xsave_area_size], 0x1000
 
@@ -724,6 +739,9 @@ proc umka_init c uses ebx esi edi ebp
         mov     ebx, SLOT_BASE + 2*sizeof.APPDATA
         mov     word[cur_dir.path], '/'
         mov     [ebx+APPDATA.cur_dir], cur_dir
+        ; end of set_variables
+
+        call    init_irqs
 
         ret
 endp
@@ -1034,6 +1052,9 @@ ide_channel6_mutex MUTEX
 ide_channel7_mutex MUTEX
 ide_channel8_mutex MUTEX
 
+ioapic_data rb 0x400
+lapic_data rb 0x400
+
 lfb_base        rd MAX_SCREEN_WIDTH*MAX_SCREEN_HEIGHT
 
 align 4096
diff --git a/umka.h b/umka.h
index 86a5c7f..3f742ec 100644
--- a/umka.h
+++ b/umka.h
@@ -541,6 +541,12 @@ umka_mouse_move(int lbheld, int mbheld, int rbheld, int xabs, int32_t xmoving,
 STDCALL net_buff_t *
 kos_net_buff_alloc(size_t size);
 
+STDCALL void
+kos_attach_int_handler(int irq, int (*handler)(void*), void *user_data);
+
+void
+kos_irq_serv_irq10(void);
+
 static inline int32_t
 umka_fs_execute(const char *filename) {
 // edx Flags
diff --git a/umka_os.c b/umka_os.c
index 162e410..6e1129d 100644
--- a/umka_os.c
+++ b/umka_os.c
@@ -111,6 +111,13 @@ void handle_i40(int signo, siginfo_t *info, void *context) {
     umka_i40((pushad_t*)(ctx->uc_mcontext.__gregs + REG_EDI));
 }
 
+void handle_irq_net(int signo, siginfo_t *info, void *context) {
+    (void)signo;
+    (void)info;
+    (void)context;
+    kos_irq_serv_irq10();
+}
+
 int
 main() {
     if (coverage)
@@ -138,6 +145,15 @@ main() {
         return 1;
     }
 
+    sa.sa_sigaction = handle_irq_net;
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = SA_SIGINFO;
+
+    if (sigaction(SIGUSR1, &sa, NULL) == -1) {
+        printf("Can't install SIGUSR1 handler!\n");
+        return 1;
+    }
+
     void *app_base = mmap((void*)0, 16*0x100000, PROT_READ | PROT_WRITE |
                           PROT_EXEC, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
                           -1, 0);
diff --git a/vnet.c b/vnet.c
index ea474b2..cb4a099 100644
--- a/vnet.c
+++ b/vnet.c
@@ -17,6 +17,12 @@ typedef struct {
     int fd;
 } vnet_userdata_t;
 
+int vnet_input(void *udata) {
+    vnet_userdata_t *u = udata;
+    fprintf(stderr, "###### vnet_input\n");
+    return 1;
+}
+
 net_device_t *vnet_init(int fd) {
 //    printf("vnet_init\n");
     vnet_userdata_t *u = (vnet_userdata_t*)malloc(sizeof(vnet_userdata_t));
@@ -44,6 +50,8 @@ net_device_t *vnet_init(int fd) {
              .userdata = u,
     };
 
+    kos_attach_int_handler(SIGUSR1, vnet_input, u);
+
     return vnet;
 }