diff options
Diffstat (limited to 'src/i830_driver.c')
| -rw-r--r-- | src/i830_driver.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/src/i830_driver.c b/src/i830_driver.c index 39ffa542..55610f5e 100644 --- a/src/i830_driver.c +++ b/src/i830_driver.c @@ -394,7 +394,7 @@ I830DetectMemory(ScrnInfoPtr pScrn) I830Ptr pI830 = I830PTR(pScrn); PCITAG bridge; CARD16 gmch_ctrl; - int memsize = 0; + int memsize = 0, gtt_size; int range; #if 0 VbeInfoBlock *vbeInfo; @@ -403,9 +403,35 @@ I830DetectMemory(ScrnInfoPtr pScrn) bridge = pciTag(0, 0, 0); /* This is always the host bridge */ gmch_ctrl = pciReadWord(bridge, I830_GMCH_CTRL); - /* We need to reduce the stolen size, by the GTT and the popup. - * The GTT varying according the the FbMapSize and the popup is 4KB */ - range = (pI830->FbMapSize / (1024*1024)) + 4; + if (IS_I965G(pI830)) { + /* The 965 may have a GTT that is actually larger than is necessary + * to cover the aperture, so check the hardware's reporting of the + * GTT size. + */ + switch (INREG(PGETBL_CTL) & PGETBL_SIZE_MASK) { + case PGETBL_SIZE_512KB: + gtt_size = 512; + break; + case PGETBL_SIZE_256KB: + gtt_size = 256; + break; + case PGETBL_SIZE_128KB: + gtt_size = 128; + break; + default: + FatalError("Unknown GTT size value: %08x\n", (int)INREG(PGETBL_CTL)); + } + } else { + /* Older chipsets only had GTT appropriately sized for the aperture. */ + gtt_size = pI830->FbMapSize / (1024*1024); + } + + xf86DrvMsg(pScrn->scrnIndex, X_INFO, "detected %d kB GTT.\n", gtt_size); + + /* The stolen memory has the GTT at the top, and the 4KB popup below that. + * Everything else can be freely used by the graphics driver. + */ + range = gtt_size + 4; if (IS_I85X(pI830) || IS_I865G(pI830) || IS_I9XX(pI830)) { switch (gmch_ctrl & I830_GMCH_GMS_MASK) { |