soc/intel/cmn/sa: Add APIs into System Agent (SA) common code

This commit streamlines code and strengthens common code robustness
by moving the following SoC-layer functions to the common layer:

- sa_get_mmcfg_size: Retrieves the MMIO (Memory-Mapped I/O)
                     configuration space size by reading offset
                     0x60 of the PCI Host Bridge (D0:F0).
- sa_get_dsm_size: Calculates the size of the DSM (Device Stolen
                   Memory) by reading offset 0x50 of the PCI
                   Host Bridge (D0:F0) to determine pre-allocated
                   memory for the IGD (Integrated Graphics Device).
- sa_get_gsm_size: Calculates the size of the GSM (Graphics Stolen
                   Memory) by reading offset 0x52 of the PCI Host
                   Bridge (D0:F0).
- sa_get_dpr_size: Determines the size of the DMA Protection
                   Range (DPR) by reading offset 0x5C of the PCI
                   Host Bridge (D0:F0).

TEST= Build and boot successful on google/screebo.

Change-Id: Ic00e001563ec6f0d737a445964c716b45db43327
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80362
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

0 files changed, 0 insertions, 0 deletions