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| author | Paolo Bonzini <pbonzini@redhat.com> | 2014-12-29 14:43:42 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2024-01-18 10:43:13 +0100 |
| commit | 9b53b95a1c3b46e5a54734a46f37790460c9265e (patch) | |
| tree | 9edfc2fa6e3c0434ac065edae3bc6c56786dffff /hw/display/vga.c | |
| parent | f9b925fd41337027e959baeb23d714b5214cd5ff (diff) | |
| download | focaccia-qemu-9b53b95a1c3b46e5a54734a46f37790460c9265e.tar.gz focaccia-qemu-9b53b95a1c3b46e5a54734a46f37790460c9265e.zip | |
vga: mask addresses in non-VESA modes to 256k
This allows setting the start address to a high value, and reading the
bottom of the screen from the beginning of VRAM. Commander Keen 4
("Goodbye, Galaxy!") relies on this behavior.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/display/vga.c')
| -rw-r--r-- | hw/display/vga.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/hw/display/vga.c b/hw/display/vga.c index fea26f9123..5bf4d14f34 100644 --- a/hw/display/vga.c +++ b/hw/display/vga.c @@ -47,6 +47,9 @@ bool have_vga = true; /* 16 state changes per vertical frame @60 Hz */ #define VGA_TEXT_CURSOR_PERIOD_MS (1000 * 2 * 16 / 60) +/* Address mask for non-VESA modes. */ +#define VGA_VRAM_SIZE (256 * KiB) + /* * Video Graphics Array (VGA) * |