hw/display/vga-access.h

   1 /*
   2  * QEMU VGA Emulator templates
   3  *
   4  * Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 static inline uint8_t vga_read_byte(VGACommonState *vga, uint32_t addr)
  26 {
  27     return vga->vram_ptr[addr & vga->vbe_size_mask];
  28 }
  29
  30 static inline uint16_t vga_read_word_le(VGACommonState *vga, uint32_t addr)
  31 {
  32     uint32_t offset = addr & vga->vbe_size_mask & ~1;
  33     uint16_t *ptr = (uint16_t *)(vga->vram_ptr + offset);
  34     return lduw_le_p(ptr);
  35 }
  36
  37 static inline uint16_t vga_read_word_be(VGACommonState *vga, uint32_t addr)
  38 {
  39     uint32_t offset = addr & vga->vbe_size_mask & ~1;
  40     uint16_t *ptr = (uint16_t *)(vga->vram_ptr + offset);
  41     return lduw_be_p(ptr);
  42 }
  43
  44 static inline uint32_t vga_read_dword_le(VGACommonState *vga, uint32_t addr)
  45 {
  46     uint32_t offset = addr & vga->vbe_size_mask & ~3;
  47     uint32_t *ptr = (uint32_t *)(vga->vram_ptr + offset);
  48     return ldl_le_p(ptr);
  49 }