%define BOOT0_LOADPOINT 0x7c00
%define BOOT1_LOADPOINT 0x8200

%define MEMMAP                0x6a00
%define MEMMAP_END            BOOT0_LOADPOINT
%define MEMMAP_ENT_SIZE       32
%define MEMMAP_CAP            ((MEMMAP_END - MEMMAP) / MEMMAP_ENT_SIZE)

%define GLOBALS     0x4000
%define GLOBALS_END MEMMAP
%define STACK_BASE  GLOBALS

%define EBDA_START 0x080000

%define VGA_SEG 0xb800

%define BOOT1_MAGIC 0x544e4150

%define VGA_WIDTH  80
%define VGA_HEIGHT 25

%define INTEL_8042_IO_DATA   0x60
%define INTEL_8042_IN_STATUS 0x64
%define INTEL_8042_OUT_CMD   0x64

%define INTEL_8042_STATUS_BIT_OBUF 0
%define INTEL_8042_STATUS_BIT_IBUF 1
%define INTEL_8042_STATUS_MASK_OBUF (1 << INTEL_8042_STATUS_BIT_OBUF)
%define INTEL_8042_STATUS_MASK_IBUF (1 << INTEL_8042_STATUS_BIT_IBUF)

%define INTEL_8042_CMD_PS2_1_DISABLE             0xad
%define INTEL_8042_CMD_PS2_1_ENABLE              0xae
%define INTEL_8042_CMD_CONTROLLER_OUT_PORT_READ  0xd0
%define INTEL_8042_CMD_CONTROLLER_OUT_PORT_WRITE 0xd1

; ASCII string "SMAP", which is used by e820 as a magic number argument and return value.
%define E820_MAGIC 0x534d4150
; Size of entry returned by e820. This is less than MEMMAP_ENT_SIZE because we add some fields of
; our own.
%define E820_ENTRY_SIZE 24

%define MEMMAP_ENT_FIELD_BASE 0x00
%define MEMMAP_ENT_FIELD_LEN  0x08
%define MEMMAP_ENT_FIELD_TYPE 0x10
%define MEMMAP_ENT_FIELD_EXT  0x14
%define MEMMAP_ENT_FIELD_END  0x18

%define GDT_DESCRIPTOR_SIZE 0x08

; 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

; Globals
; ------------------------------------------------------------------------------------------------
%define VGA_COL                0x1c
%define TEXTBUF_LINE           0x1e
%define MEMMAP_ENTRIES         0x20

%macro fnstart 0
  push bp
  mov bp, sp
%endmacro

%macro fnret 0
  pop bp
  ret
%endmacro