1 files changed, 122 insertions, 0 deletions
diff --git a/1_hello_world/startup.c b/1_hello_world/startup.c
new file mode 100644
index 0000000..3b3c017
--- /dev/null
+++ b/1_hello_world/startup.c
@@ -0,0 +1,122 @@
+typedef void (*ptr_func_t)();
+
+struct smd_header {
+    char console_name[16];
+    char copyright[16];
+    char domestic_name[48];
+    char international_name[48];
+    char version[14];
+    unsigned short checksum;
+    char io_support[16];
+    unsigned long rom_start;
+    unsigned long rom_end;
+    unsigned long ram_start;
+    unsigned long ram_end;
+    unsigned long sram_enabled;
+    unsigned long unused1;
+    unsigned long sram_start;
+    unsigned long sram_end;
+    unsigned long unused2;
+    unsigned long unused3;
+    char notes[40];
+    char country_codes[16];
+};
+
+extern void __start(void);
+static void HSYNC_handler(void);
+static void VSYNC_handler(void);
+
+extern unsigned __stacktop;
+
+__attribute__((section(".stack"), used)) unsigned *__stack_init = &__stacktop;
+
+__attribute__((section(".vectors"), used)) ptr_func_t __isr_vectors[] = {
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    HSYNC_handler,
+    __start,
+    VSYNC_handler,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+    __start,
+};
+
+__attribute__((section(".smd_header"), used)) struct smd_header __smd_header = {
+    .console_name = "SEGA MEGA DRIVE ",
+    .copyright = "BIGEVILCORP.    ",
+    .domestic_name = "HELLO WORLD                                     ",
+    .international_name = "HELLO WORLD                                     ",
+    .version = "GM XXXXXXXX-XX",
+    .checksum = 0x0000,
+    .io_support = "J               ",
+    .rom_start = 0,
+    .rom_end = 0xfffff,
+    .ram_start = 0xff0000,
+    .ram_end = 0xffffff,
+    .sram_enabled = 0x00000000,
+    .unused1 = 0x00000000,
+    .sram_start = 0x00000000,
+    .sram_end = 0x00000000,
+    .unused2 = 0x00000000,
+    .unused3 = 0x00000000,
+    .notes = "                                        ",
+    .country_codes = "  E             ",
+};
+
+void HSYNC_handler(void) {}
+void VSYNC_handler(void) {}