soc/intel/skylake: Generate ACPI RMRR table
An ACPI RMRR table is requried for IOMMU to work properly with an
iGPU (without using passthrough mode), so create one along with the
DRHD DMAR table if the iGPU is present and enabled.
Test: build/boot google/chell and purism/librem13v2 with kernel
parameter 'intel_iommu=on' but without 'iommu=pt;' observe integrated
graphics functional without corruption.
Change-Id: I202fb3eb8618f99d41f3d1c5bbb83b2ec982aca4
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/27270
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Youness Alaoui <snifikino@gmail.com>
diff --git a/src/soc/intel/common/block/include/intelblocks/systemagent.h b/src/soc/intel/common/block/include/intelblocks/systemagent.h
index a731b9c..babf9ce 100644
--- a/src/soc/intel/common/block/include/intelblocks/systemagent.h
+++ b/src/soc/intel/common/block/include/intelblocks/systemagent.h
@@ -77,6 +77,8 @@
uintptr_t sa_get_tolud_base(void);
/* API to get DSM size */
size_t sa_get_dsm_size(void);
+/* API to get GSM base address */
+uintptr_t sa_get_gsm_base(void);
/* API to get GSM size */
size_t sa_get_gsm_size(void);
/* API to get TSEG base address */
diff --git a/src/soc/intel/common/block/systemagent/systemagent_early.c b/src/soc/intel/common/block/systemagent/systemagent_early.c
index 609e159..c1cef5d 100644
--- a/src/soc/intel/common/block/systemagent/systemagent_early.c
+++ b/src/soc/intel/common/block/systemagent/systemagent_early.c
@@ -174,7 +174,7 @@
return (prealloc_memory - 0xEF) * 4*MiB;
}
-static uintptr_t sa_get_gsm_base(void)
+uintptr_t sa_get_gsm_base(void)
{
/* All regions concerned for have 1 MiB alignment. */
return ALIGN_DOWN(pci_read_config32(SA_DEV_ROOT, BGSM), 1*MiB);