Wrap kos_osloop, add a test for resizing cursors

shell.c

@@ -3460,6 +3460,21 @@ cmd_net_arp_del_entry(struct shell_ctx *ctx, int argc, char **argv) {
 
 #endif // _WIN32
 
+static void
+cmd_osloop(struct shell_ctx *ctx, int argc, char **argv) {
+    (void)ctx;
+    (void)argv;
+    const char *usage = \
+        "usage: osloop";
+    if (argc != 1) {
+        puts(usage);
+        return;
+    }
+    COVERAGE_ON();
+    umka_osloop();
+    COVERAGE_OFF();
+}
+
 static void
 cmd_bg_set_size(struct shell_ctx *ctx, int argc, char **argv) {
     (void)ctx;
@@ -3681,6 +3696,7 @@ func_table_t cmd_cmds[] = {
     { "net_listen",                     cmd_net_listen },
     { "net_open_socket",                cmd_net_open_socket },
 #endif // _WIN32
+    { "osloop",                         cmd_osloop },
     { "pci_get_path",                   cmd_pci_get_path },
     { "pci_set_path",                   cmd_pci_set_path },
     { "process_info",                   cmd_process_info },

test/054_#draw_#cursor_#osloop_resize.ref.log

@@ -0,0 +1,20 @@
+/> umka_init
+/> 
+/> ramdisk_init ../img/kolibri.img
+/rd/1: fat
+/> set_skin /sys/DEFAULT.SKN
+status: 0
+/> 
+/> window_redraw 1
+/> draw_window 10 300 5 200 0x000088 1 1 1 0 1 3 hello
+/> window_redraw 2
+/> 
+/> set_mouse_pos_screen 307 202
+/> osloop
+/> 
+/> mouse_move -x +1 -y +1
+/> osloop
+/> 
+/> scrot 054_#draw_#cursor_#osloop_resize.out.png
+/> 
+/> disk_del rd

test/054_#draw_#cursor_#osloop_resize.t

@@ -0,0 +1,18 @@
+umka_init
+
+ramdisk_init ../img/kolibri.img
+set_skin /sys/DEFAULT.SKN
+
+window_redraw 1
+draw_window 10 300 5 200 0x000088 1 1 1 0 1 3 hello
+window_redraw 2
+
+set_mouse_pos_screen 307 202
+osloop
+
+mouse_move -x +1 -y +1
+osloop
+
+scrot 054_#draw_#cursor_#osloop_resize.out.png
+
+disk_del rd

umka.asm

@@ -983,7 +983,17 @@ macro format [x] {}
 
 bios32_entry equ bios32_entry_pew
 tmp_page_tabs equ tmp_page_tabs_pew
+macro jmp target {
+  if target eq osloop
+        cmp     [umka_tool], UMKA_SHELL
+        jnz     osloop
+        ret
+  else
+        jmp     target
+  end if
+}
 include 'kernel.asm'
+purge jmp
 restore bios32_entry, tmp_page_tabs
 purge org,sys_msg_board,delay_ms
 restore org,sys_msg_board,delay_ms

umka.h

@@ -499,8 +499,16 @@ typedef struct {
     size_t el_cnt;
 } kos_node_package_t;
 
-__attribute__((__noreturn__)) void
-kos_osloop(void);
+static inline void
+umka_osloop() {
+    __asm__ __inline__ __volatile__ (
+        "pushad;"
+        "call   kos_osloop;"
+        "popad"
+        :
+        :
+        : "memory", "cc");
+}
 
 void
 irq0(int signo, siginfo_t *info, void *context);
@@ -996,7 +1004,6 @@ umka_scheduler_add_thread(appdata_t *thread, int32_t priority) {
         : "c"(priority),
           "d"(thread)
         : "memory", "cc");
-
 }
 
 #define MAX_PRIORITY    0

umka_os.c

@@ -217,7 +217,7 @@ main() {
 
     setitimer(ITIMER_PROF, &timeout, NULL);
 
-    kos_osloop();   // doesn't return
+    umka_osloop();   // doesn't return
 
     if (coverage)
         trace_end();