#include "dart.h"
+extern int iommu_is_off;
extern int iommu_force_on;
/* Physical base address and size of the DART table */
* prefetching into invalid pages and corrupting data
*/
tmp = lmb_alloc(DART_PAGE_SIZE, DART_PAGE_SIZE);
- if (!tmp)
- panic("DART: Cannot allocate spare page!");
dart_emptyval = DARTMAP_VALID | ((tmp >> DART_PAGE_SHIFT) &
DARTMAP_RPNMASK);
iommu_table_dart.it_base = (unsigned long)dart_vbase;
iommu_table_dart.it_index = 0;
iommu_table_dart.it_blocksize = 1;
- iommu_init_table(&iommu_table_dart);
+ iommu_init_table(&iommu_table_dart, -1);
/* Reserve the last page of the DART to avoid possible prefetch
* past the DART mapped area
void __init alloc_dart_table(void)
{
- /* Only reserve DART space if machine has more than 2GB of RAM
+ /* Only reserve DART space if machine has more than 1GB of RAM
* or if requested with iommu=on on cmdline.
+ *
+ * 1GB of RAM is picked as limit because some default devices
+ * (i.e. Airport Extreme) have 30 bit address range limits.
*/
- if (lmb_end_of_DRAM() <= 0x80000000ull && !iommu_force_on)
+
+ if (iommu_is_off)
+ return;
+
+ if (!iommu_force_on && lmb_end_of_DRAM() <= 0x40000000ull)
return;
/* 512 pages (2MB) is max DART tablesize. */