bits 64

section .text

global _syscall_encode_color
_syscall_encode_color:
  xor rax, rax
  and edi, 0xff
  and dx, 0xff
  shl si, 8
  shl edx, 16
  or di, si
  or edi, edx
  syscall
  ret

global _syscall_get_framebuffer
_syscall_get_framebuffer:
  push rcx
  push rdx
  push rsi
  push rdi
  mov rax, 1
  syscall
  pop rcx
  mov qword [rcx], rax
  pop rcx
  mov dword [rcx], edi
  pop rcx
  shr rdi, 32
  mov dword [rcx], edi
  pop rcx
  mov dword [rcx], esi
  ret

global _syscall_open_file
_syscall_open_file:
  mov rax, 2
  push rdx
  syscall
  pop rdx
  mov qword [rdx], rdi
  ret

global _syscall_get_file_length
_syscall_get_file_length:
  mov rax, 3
  push rsi
  syscall
  pop rsi
  mov qword [rsi], rdi
  ret

global _syscall_read_from_file
_syscall_read_from_file:
  mov rax, 4
  push rcx
  push rdx
  push rsi
  push rdi
  mov rdi, rsp
  syscall
  add rsp, 32
  ret

global _syscall_end_this_process
_syscall_end_this_process:
  mov rax, 5
  syscall
  ;does not return

global _syscall_get_new_pages
_syscall_get_new_pages:
  mov rax, 6
  syscall
  ret

global _syscall_close_file
_syscall_close_file:
  mov rax, 7
  syscall
  ret