1 files changed, 130 insertions, 0 deletions
diff --git a/2_scroll_planes/startup.c b/2_scroll_planes/startup.c
new file mode 100644
index 0000000..f2574cd
--- /dev/null
+++ b/2_scroll_planes/startup.c
@@ -0,0 +1,130 @@
+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];
+};
+
+void INT_Null(void) __attribute__((weak, interrupt));
+void CPU_EntryPoint(void) __attribute__((weak, alias ("INT_Null")));
+void INT_HInterrupt(void) __attribute__((weak, alias ("INT_Null")));
+void INT_VInterrupt(void) __attribute__((weak, alias ("INT_Null")));
+void CPU_Exception(void) __attribute__((weak, interrupt));
+
+extern unsigned __stacktop;
+extern unsigned __rom_start;
+extern unsigned __rom_end;
+
+__attribute__((section(".stack"), used)) unsigned *__stack_init = &__stacktop;
+
+__attribute__((section(".vectors"), used)) ptr_func_t __isr_vectors[] = {
+    CPU_EntryPoint,
+    CPU_Exception,
+    CPU_Exception,
+    CPU_Exception,
+    CPU_Exception,
+    CPU_Exception,
+    CPU_Exception,
+    CPU_Exception,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_HInterrupt,
+    INT_Null,
+    INT_VInterrupt,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+    INT_Null,
+};
+
+__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 = (unsigned long)&__rom_start,
+    .rom_end = (unsigned long)&__rom_end-1,
+    .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 INT_Null(void) {}
+
+void CPU_Exception(void)
+{
+     asm inline volatile ("  stop #2700");
+}