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| author | Gerd Hoffmann <kraxel@redhat.com> | 2018-09-25 09:56:43 +0200 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2018-09-27 08:07:51 +0200 |
| commit | e7992fc5a002003ae865685ad4635b952c1ca9bf (patch) | |
| tree | 4c814ddd0f854ea605de4b3911575f9a068d1383 | |
| parent | 72d277a70e8b2d4eb1b3667ab934fb1fecf41410 (diff) | |
| download | qemu-e7992fc5a002003ae865685ad4635b952c1ca9bf.zip qemu-e7992fc5a002003ae865685ad4635b952c1ca9bf.tar.gz qemu-e7992fc5a002003ae865685ad4635b952c1ca9bf.tar.bz2 | |
display/edid: add qemu_edid_size()
Helper function to figure the size of a edid blob, by checking how many
extensions are present. Both the base edid blob and the extensions are
128 bytes in size.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20180925075646.25114-3-kraxel@redhat.com
| -rw-r--r-- | hw/display/edid-generate.c | 14 | ||||
| -rw-r--r-- | include/hw/display/edid.h | 1 |
2 files changed, 15 insertions, 0 deletions
diff --git a/hw/display/edid-generate.c b/hw/display/edid-generate.c index b3e493d..c80397e 100644 --- a/hw/display/edid-generate.c +++ b/hw/display/edid-generate.c @@ -423,3 +423,17 @@ void qemu_edid_generate(uint8_t *edid, size_t size, edid_checksum(dta); } } + +size_t qemu_edid_size(uint8_t *edid) +{ + uint32_t exts; + + if (edid[0] != 0x00 || + edid[1] != 0xff) { + /* doesn't look like a valid edid block */ + return 0; + } + + exts = edid[126]; + return 128 * (exts + 1); +} diff --git a/include/hw/display/edid.h b/include/hw/display/edid.h index 63b6001..96910ad 100644 --- a/include/hw/display/edid.h +++ b/include/hw/display/edid.h @@ -14,5 +14,6 @@ typedef struct qemu_edid_info { void qemu_edid_generate(uint8_t *edid, size_t size, qemu_edid_info *info); +size_t qemu_edid_size(uint8_t *edid); #endif /* EDID_H */ |