| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| /* Use simple device model for this file even in ramstage */ |
| #define __SIMPLE_DEVICE__ |
| |
| #include <cbmem.h> |
| #include <cpu/x86/smm.h> |
| #include <device/pci.h> |
| #include <device/pci_ops.h> |
| #include <soc/pci_devs.h> |
| #include <soc/systemagent.h> |
| #include <stdint.h> |
| |
| static uintptr_t dpr_region_start(void) |
| { |
| /* |
| * 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. |
| */ |
| uintptr_t dpr = pci_read_config32(SA_DEV_ROOT, DPR); |
| uintptr_t tom = ALIGN_DOWN(dpr, 1 * MiB); |
| |
| /* Subtract DMA Protected Range size if enabled */ |
| if (dpr & DPR_EPM) |
| tom -= (dpr & DPR_SIZE_MASK) << 16; |
| |
| return tom; |
| } |
| |
| void *cbmem_top_chipset(void) |
| { |
| return (void *) dpr_region_start(); |
| } |
| |
| void smm_region(uintptr_t *start, size_t *size) |
| { |
| uintptr_t tseg = pci_read_config32(SA_DEV_ROOT, TSEG); |
| uintptr_t bgsm = pci_read_config32(SA_DEV_ROOT, BGSM); |
| |
| tseg = ALIGN_DOWN(tseg, 1 * MiB); |
| bgsm = ALIGN_DOWN(bgsm, 1 * MiB); |
| *start = tseg; |
| *size = bgsm - tseg; |
| } |