load remaining boot1 sectors

defines.s

@@ -0,0 +1,31 @@
+%define BOOT0_LOADPOINT 0x7c00
+%define BOOT1_LOADPOINT 0x8200
+
+%define GLOBALS    0x7000
+%define STACK_BASE GLOBALS
+
+%define EBDA_START 0x080000
+
+; boot0 base stack frame variable offsets / globals
+; (we use the same offsets once we copy the variables to the globals section)
+; -------------------------------------------------------------------------------------------------
+; The boot drive number given to us by the BIOS.
+%define BOOT_DRIVE             0x02
+; Boot drive geometry
+%define SECTORS_PER_TRACK      0x04
+%define N_HEADS                0x06
+; Starting LBA of the GPT partition entries array.
+%define GPT_ENTRIES_START_LBA  0x08
+; Number of GPT entries, saturated to 16 bits.
+%define GPT_N_ENTRIES_16       0x0a
+; Number of sectors to advance by once we've read every GPT entry in the current sector.
+%define GPT_SECTOR_STRIDE      0x0c
+; Number of bytes to advance by in the current sector once we've read a GPT entry.
+%define GPT_BYTE_STRIDE        0x0e
+; Number of GPT entries which can fit in a single sector.
+%define GPT_ENTRIES_PER_SECTOR 0x10
+%define GPT_CURRENT_ENTRY_IDX  0x12
+%define GPT_SECTOR_ENTRY_IDX   0x14
+%define GPT_SECTORS_LOADED     0x16
+%define GPT_CURRENT_LBA        0x18
+%define BOOT1_GPT_ENTRY_ADDR   0x1a