feat: introduced stream to separate actual io and other tasks

kernel/libk/kprint.c

@@ -2,9 +2,19 @@
 // Created by rick on 28-01-21.
 //
 
+#include <util/stream.h>
+#include <libc/string.h>
+#include <stdbool.h>
+#include <attributes.h>
+#include <tasks/task.h>
+#include <libc/libc.h>
 #include "kprint.h"
 
 #define MAX_HANDLERS 8
+#define STREAM_SIZE 512
+#define PRINT_BUFFER_SIZE 64
+
+stream_t *kprint_stream;
 
 kprint_handler handlers[MAX_HANDLERS] = {
         NULL,
@@ -28,10 +38,36 @@ void kprint_register(kprint_handler handler) {
 }
 
 void kprint(const char *msg) {
+    stream_write(kprint_stream, (const uint8_t *) msg, strlen(msg));
+}
+
+void kprint_internal(const char *msg) {
     for (int i = 0; i < MAX_HANDLERS; ++i) {
         if (handlers[i] == NULL) {
             continue;
         }
         handlers[i](msg);
     }
+}
+
+void kprint_init() {
+    kprint_stream = stream_create(STREAM_SIZE);
+}
+
+void noreturn kprint_task(void *_) {
+    uint32_t last_read = 0;
+    uint8_t data[PRINT_BUFFER_SIZE + 1] = {0};
+    while (true) {
+        stream_wait(kprint_stream);
+        while (true) {
+            last_read = stream_read(kprint_stream, data, PRINT_BUFFER_SIZE);
+            if (last_read == 0) break;
+            data[last_read] = 0;
+            kprint_internal((const char *) data);
+        };
+    }
+}
+
+void kprint_start_task() {
+    task_spawn(kprint_task, NULL);
 }