diff options
Diffstat (limited to 'src/soc/intel/xeon_sp/memmap.c')
| -rw-r--r-- | src/soc/intel/xeon_sp/memmap.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/soc/intel/xeon_sp/memmap.c b/src/soc/intel/xeon_sp/memmap.c new file mode 100644 index 0000000000..79ab47eaed --- /dev/null +++ b/src/soc/intel/xeon_sp/memmap.c @@ -0,0 +1,22 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <device/pci_ops.h> +#include <cpu/x86/smm.h> +#include <soc/pci_devs.h> + +void smm_region(uintptr_t *start, size_t *size) +{ + uintptr_t tseg_base = pci_read_config32(VTD_DEV(0), VTD_TSEG_BASE_CSR); + uintptr_t tseg_limit = pci_read_config32(VTD_DEV(0), VTD_TSEG_LIMIT_CSR); + + tseg_base = ALIGN_DOWN(tseg_base, 1 * MiB); + tseg_limit = ALIGN_DOWN(tseg_limit, 1 * MiB); + /* Only the upper [31:20] bits of an address are checked against + * VTD_TSEG_LIMIT_CSR[31:20] which must be below or equal, so this + * effectively means +1MiB for the limit. + */ + tseg_limit += 1 * MiB; + + *start = tseg_base; + *size = tseg_limit - tseg_base; +} |