diff options
Diffstat (limited to 'drivers/video/geode/display_gx.c')
| -rw-r--r-- | drivers/video/geode/display_gx.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/video/geode/display_gx.c b/drivers/video/geode/display_gx.c index 1e82ecc367dd..e759895bf3d3 100644 --- a/drivers/video/geode/display_gx.c +++ b/drivers/video/geode/display_gx.c @@ -25,7 +25,23 @@ unsigned int gx_frame_buffer_size(void) { unsigned int val; - /* FB size is reported by a virtual register */ + if (!geode_has_vsa2()) { + uint32_t hi, lo; + + /* The number of pages is (PMAX - PMIN)+1 */ + rdmsr(MSR_GLIU_P2D_RO0, lo, hi); + + /* PMAX */ + val = ((hi & 0xff) << 12) | ((lo & 0xfff00000) >> 20); + /* PMIN */ + val -= (lo & 0x000fffff); + val += 1; + + /* The page size is 4k */ + return (val << 12); + } + + /* FB size can be obtained from the VSA II */ /* Virtual register class = 0x02 */ /* VG_MEM_SIZE(512Kb units) = 0x00 */ |