| 662 |
662 |
void vga_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
|
| 663 |
663 |
{
|
| 664 |
664 |
VGAState *s = opaque;
|
| 665 |
|
int memory_map_mode, plane, write_mode, b, func_select;
|
|
665 |
int memory_map_mode, plane, write_mode, b, func_select, mask;
|
| 666 |
666 |
uint32_t write_mask, bit_mask, set_mask;
|
| 667 |
667 |
|
| 668 |
668 |
#ifdef DEBUG_VGA_MEM
|
| ... | ... | |
| 695 |
695 |
if (s->sr[4] & 0x08) {
|
| 696 |
696 |
/* chain 4 mode : simplest access */
|
| 697 |
697 |
plane = addr & 3;
|
| 698 |
|
if (s->sr[2] & (1 << plane)) {
|
|
698 |
mask = (1 << plane);
|
|
699 |
if (s->sr[2] & mask) {
|
| 699 |
700 |
s->vram_ptr[addr] = val;
|
| 700 |
701 |
#ifdef DEBUG_VGA_MEM
|
| 701 |
702 |
printf("vga: chain4: [0x%x]\n", addr);
|
| 702 |
703 |
#endif
|
|
704 |
s->plane_updated |= mask; /* only used to detect font change */
|
| 703 |
705 |
cpu_physical_memory_set_dirty(s->vram_offset + addr);
|
| 704 |
706 |
}
|
| 705 |
707 |
} else if (s->gr[5] & 0x10) {
|
| 706 |
708 |
/* odd/even mode (aka text mode mapping) */
|
| 707 |
709 |
plane = (s->gr[4] & 2) | (addr & 1);
|
| 708 |
|
if (s->sr[2] & (1 << plane)) {
|
|
710 |
mask = (1 << plane);
|
|
711 |
if (s->sr[2] & mask) {
|
| 709 |
712 |
addr = ((addr & ~1) << 1) | plane;
|
| 710 |
713 |
s->vram_ptr[addr] = val;
|
| 711 |
714 |
#ifdef DEBUG_VGA_MEM
|
| 712 |
715 |
printf("vga: odd/even: [0x%x]\n", addr);
|
| 713 |
716 |
#endif
|
|
717 |
s->plane_updated |= mask; /* only used to detect font change */
|
| 714 |
718 |
cpu_physical_memory_set_dirty(s->vram_offset + addr);
|
| 715 |
719 |
}
|
| 716 |
720 |
} else {
|
| ... | ... | |
| 775 |
779 |
|
| 776 |
780 |
do_write:
|
| 777 |
781 |
/* mask data according to sr[2] */
|
| 778 |
|
write_mask = mask16[s->sr[2]];
|
|
782 |
mask = s->sr[2];
|
|
783 |
s->plane_updated |= mask; /* only used to detect font change */
|
|
784 |
write_mask = mask16[mask];
|
| 779 |
785 |
((uint32_t *)s->vram_ptr)[addr] =
|
| 780 |
786 |
(((uint32_t *)s->vram_ptr)[addr] & ~write_mask) |
|
| 781 |
787 |
(val & write_mask);
|
| ... | ... | |
| 1088 |
1094 |
s->font_offsets[1] = offset;
|
| 1089 |
1095 |
full_update = 1;
|
| 1090 |
1096 |
}
|
| 1091 |
|
|
|
1097 |
if (s->plane_updated & (1 << 2)) {
|
|
1098 |
/* if the plane 2 was modified since the last display, it
|
|
1099 |
indicates the font may have been modified */
|
|
1100 |
s->plane_updated = 0;
|
|
1101 |
full_update = 1;
|
|
1102 |
}
|
| 1092 |
1103 |
full_update |= update_basic_params(s);
|
| 1093 |
1104 |
|
| 1094 |
1105 |
line_offset = s->line_offset;
|