src/tests/comboot/shuffle-simple.asm

   1         bits 16
   2         org 100h
   3
   4         jmp start
   5
   6 shuffle_start:
   7         push 0xB800
   8         pop es
   9         mov cx, 80*24*2
  10         mov ax, 'AA'
  11         xor di, di
  12         rep stosw
  13 .lbl:   jmp .lbl
  14 shuffle_end:
  15         nop
  16 shuffle_len equ (shuffle_end - shuffle_start + 1)
  17
  18 start:
  19         ; calculate physical address of shuffled part
  20         xor eax, eax
  21         push ds
  22         pop ax
  23         shl eax, 4
  24         add ax, shuffle_start
  25         mov dword [source], eax
  26
  27         mov ax, 0012h
  28         mov di, shuffle_descriptors
  29         mov cx, num_shuffle_descriptors
  30         mov ebp, 0x7c00
  31         int 22h
  32         int3
  33
  34 shuffle_descriptors:
  35         dd 0x7C00
  36 source: dd 0
  37         dd shuffle_len
  38
  39 num_shuffle_descriptors equ 1
  40