libn64/rcp/vi.c

   1 //
   2 // libn64/rcp/vi.c: VI helper functions.
   3 //
   4 // n64chain: A (free) open-source N64 development toolchain.
   5 // Copyright 2014-16 Tyler J. Stachecki <stachecki.tyler@gmail.com>
   6 //
   7 // This file is subject to the terms and conditions defined in
   8 // 'LICENSE', which is part of this source code package.
   9 //
  10
  11 #include <rcp/vi.h>
  12
  13 void vi_flush_state(const vi_state_t *state) {
  14   uint32_t vi_region = 0xA4400000U;
  15   uint32_t data, end_ptr;
  16
  17   __asm__ __volatile__(
  18     ".set noreorder\n\t"
  19     ".set gp=64\n\t"
  20     "addiu %[end_ptr], %[vi_region], 0x30\n"
  21
  22     "1:\n\t"
  23     "ld %[data], 0x30(%[state])\n\t"
  24     "addiu %[state], %[state], -0x8\n\t"
  25     "sw %[data], 0x4(%[end_ptr])\n\t"
  26     "dsrl32 %[data], %[data], 0x0\n\t"
  27     "sw %[data], 0x0(%[end_ptr])\n\t"
  28     "bne %[vi_region], %[end_ptr], 1b\n\t"
  29     "addiu %[end_ptr], %[end_ptr], -0x8\n\t"
  30     ".set gp=default\n\t"
  31     ".set reorder\n\t"
  32
  33     : [state] "=&r" (state), [data] "=&r" (data),
  34       [end_ptr] "=&r" (end_ptr), [vi_region] "=&r" (vi_region)
  35     : "0" (state), "3" (vi_region)
  36   );
  37 }
  38