fix: memory layout and startup

kernel/src/init/init.cpp

@@ -45,7 +45,8 @@ static void loadMultiboot() {
 }
 
 [[maybe_unused]] [[noreturn]] __attribute__((used)) void init() {
+    initFromLow();
     print("Reached init\n", {});
-    //step("multiboot", loadMultiboot);
+    step("multiboot", loadMultiboot);
     halt();
 }

kernel/src/init/print.cpp

@@ -11,17 +11,14 @@ static constexpr int      HEX_TOP_SHIFT   = (sizeof(uint64_t) * 8) - HEX_BITS;
 
 static const char hex_chars[] = "0123456789ABCDEF";
 
-static volatile uint32_t* cursor() {
-    auto cursor_addr = read_symbol("__cursor");
-    return paddr_t{cursor_addr}.access<volatile uint32_t>();
-}
+static uint32_t cursor;
 
 static volatile uint16_t* vga_cell(uint32_t offset) {
     return paddr_t{VGA_PHYS_BASE + offset}.access<volatile uint16_t>();
 }
 
 static void next_line() {
-    *cursor() = ((*cursor() + BYTES_PER_ROW - 1) / BYTES_PER_ROW) * BYTES_PER_ROW;
+    cursor = ((cursor + BYTES_PER_ROW - 1) / BYTES_PER_ROW) * BYTES_PER_ROW;
 }
 
 static void put_char(char ch, uint16_t attr_word) {
@@ -29,12 +26,17 @@ static void put_char(char ch, uint16_t attr_word) {
         next_line();
         return;
     }
-    *vga_cell(*cursor()) = attr_word | (uint8_t)ch;
-    *cursor() += BYTES_PER_CELL;
+    *vga_cell(cursor) = attr_word | (uint16_t)ch;
+    cursor += BYTES_PER_CELL;
+}
+
+void initFromLow () {
+    auto __cursor = read_symbol("__cursor");
+    cursor = *paddr_t{__cursor}.access<volatile uint32_t>();
 }
 
 void clear() {
-    *cursor() = 0;
+    cursor = 0;
     for (int i = 0; i < VGA_COLS * VGA_ROWS; i++) {
         *vga_cell(i * BYTES_PER_CELL) = 0;
     }

kernel/src/startup/entry.cpp

@@ -141,6 +141,12 @@ __clear:
     mov $0xb8000, %edi
     mov $0x2000, %ecx
     rep stosw
+    mov $0x3D4, %dx
+    mov $0x0A, %al
+    out %al, %dx
+    inc %dx
+    mov $0x20, %al
+    out %al, %dx
     ret
 
 __print: