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soc/intel/skylake: Fix top_of_ram calculation 

FSP 2.0 implementation conditionally sets PMRR base based on
EnableC6Dram UPD. Therefore, handle the case of the PMRR base not being
set since FSP 2.0 changed behavior from FSP 1.1 implementation.

If prmrr base is non-zero value, then top_of_ram is prmrr base.

If Probeless trace is enabled, then deduct trace memory size from
calculated top_of_ram.

Change-Id: I2633bf78705e36b241668a313d215d0455fba607
Signed-off-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Signed-off-by: Naresh G Solanki <naresh.solanki@intel.com>
Reviewed-on: https://review.coreboot.org/17554
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Naresh G Solanki 2016-11-16 21:32:04 +05:30 committed by Aaron Durbin
parent 6467014046
commit 721d1b3090
1 changed files with 4 additions and 2 deletions
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6
src/soc/intel/skylake/memmap.c
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@ -150,7 +150,8 @@ u32 top_of_32bit_ram(void)
* PRMMR_BASE MSR. The system hangs if PRMRR_BASE MSR is read before
* PRMRR_MASK MSR lock bit is set.
*/
if (smm_region_start() == 0)
top_of_ram = smm_region_start();
if (top_of_ram == 0)
return 0;
dev = dev_find_slot(0, PCI_DEVFN(SA_DEV_SLOT_ROOT, 0));
@ -163,7 +164,8 @@ u32 top_of_32bit_ram(void)
* Refer to Fsp Integration Guide for the memory mapping layout.
*/
prmrr_base = rdmsr(UNCORE_PRMRR_PHYS_BASE_MSR);
top_of_ram = prmrr_base.lo;
if (prmrr_base.lo)
top_of_ram = prmrr_base.lo;
if (config->ProbelessTrace)
top_of_ram -= TRACE_MEMORY_SIZE;