diff options
Diffstat (limited to 'src/soc/intel/broadwell/memmap.c')
| -rw-r--r-- | src/soc/intel/broadwell/memmap.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/src/soc/intel/broadwell/memmap.c b/src/soc/intel/broadwell/memmap.c index c960347cf2..698ff6b83c 100644 --- a/src/soc/intel/broadwell/memmap.c +++ b/src/soc/intel/broadwell/memmap.c @@ -26,11 +26,18 @@ static unsigned long get_top_of_ram(void) { /* - * Base of TSEG is top of usable DRAM below 4GiB. The register has - * 1 MiB alignement. + * Base of DPR is top of usable DRAM below 4GiB. The register has + * 1 MiB alignment and reports the TOP of the range, the base + * must be calculated from the size in MiB in bits 11:4. */ - u32 tom = pci_read_config32(SA_DEV_ROOT, TSEG); - return (unsigned long) tom & ~((1 << 20) - 1); + u32 dpr = pci_read_config32(SA_DEV_ROOT, DPR); + u32 tom = dpr & ~((1 << 20) - 1); + + /* Subtract DMA Protected Range size if enabled */ + if (dpr & DPR_EPM) + tom -= (dpr & DPR_SIZE_MASK) << 16; + + return (unsigned long)tom; } void *cbmem_top(void) |