arm7takeover:
   ldr r1,=0x4004040 //
   mov r0,0 //
   str r0,[r1]          @\
   ldr r1,=0x4004044 //
   mov r0,0 //
   str r0,[r1]          @
   ldr r1,=0x4004048 //
   mov r0,0 //
   str r0,[r1]          @ disable wram A+B
   ldr r1,=0x4004054 //
   mov r0,0 //
   str r0,[r1]          @
   ldr r1,=0x4004058 //
   mov r0,0 //
   str r0,[r1]          @/
   ldr r1,=0x400405c //
   ldr r0,=0x00403000 //
   str r0,[r1] @-map wram C at 3000000h
   mov r10,#6  @chunk 6 (last chunk on ARM7 side@ chunks are 7,0,1,2,3,4,5,6)

  wram_chunk_loop:
   ldr r8,=0x400404c                                     @\
   add r8,r10                                            @ memorize old mapping
   ldrb r9,[r8]  @memorize old                           @ and map to ARM9
   mov r0,#0x80                                          @
   strb r0,[r8]  @map as 1st arm9 slot                   @/
   mov r1,#0x3000000                                     @\
   ldr r0,[nop]                                          @

  fill_loop:                                             @ fill chunk with NOPs
   str r0,[r1],#4                                        @
   tst r1,#0x8000                                        @
   beq fill_loop                                         @/
   ldr r4,=ldr_bx_dd_arm7_re_entry                       @\
   ldmia r4!,{r0-r3}                                     @ cast hook at chunk end
   ldr r4,=0x3007ff0                                     @
   stmia r4!,{r0-r3}                                     @/
   strb r9,[r8]  @restore old                            @-map back to ARM7
   sub r10,#1                                            @\
   and r10,#7                                            @ next chunk
   cmp r10,#6                                            @
   bne wram_chunk_loop                                   @/
   bx  lr
  @---
  nop:
    nop