1 files changed, 67 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/systemagent/memmap.c b/src/soc/intel/common/block/systemagent/memmap.c
index ea22aa6d18..809c13a1ff 100644
--- a/src/soc/intel/common/block/systemagent/memmap.c
+++ b/src/soc/intel/common/block/systemagent/memmap.c
@@ -19,15 +19,82 @@
 #include <console/console.h>
 #include <cpu/x86/mtrr.h>
 #include <cpu/x86/smm.h>
+#include <fsp/util.h>
+#include <intelblocks/ebda.h>
 #include <intelblocks/systemagent.h>
 #include <stdlib.h>
 
+/*
+ * Expected Host Memory Map (we don't know 100% and not all regions are present on all SoCs):
+ *
+ * +---------------------------+ TOUUD
+ * |                           |
+ * +---------------------------+ TOM (if mem > 4GB)
+ * | CSME UMA (if mem > 4 GiB) |
+ * +---------------------------+ TOUUD
+ * |                           |
+ * +---------------------------+ 4GiB
+ * | PCI Address Space         |
+ * +---------------------------+ TOM (if mem < 4GB)
+ * | CSME UMA (if mem < 4 GiB) |
+ * +---------------------------+ TOLUD (also maps into MC address space)
+ * | iGD / DSM                 |
+ * +---------------------------+ BDSM
+ * | GTT / GSM                 |
+ * +---------------------------+ TOLM
+ * | TSEG                      |
+ * +---------------------------+ TSEGMB
+ * | DMA Protected Region      |
+ * +---------------------------+ DPR
+ * | PRM (C6DRAM/SGX)          |
+ * +---------------------------+ PRMRR
+ * | Probeless Trace           |
+ * +---------------------------+ ME Stolen
+ * | PTT                       |
+ * +---------------------------+ TOLUM / top_of_ram / cbmem_top
+ * | CBMEM Root                |
+ * +---------------------------+
+ * | FSP Reserved Memory       |
+ * +---------------------------+
+ * | various CBMEM entries     |
+ * +---------------------------+ top_of_stack (8 byte aligned)
+ * | stack (CBMEM entry)       |
+ * +---------------------------+ FSP TOLUM
+ * |                           |
+ * +---------------------------+ 0
+ */
+
 void smm_region(uintptr_t *start, size_t *size)
 {
 	*start = sa_get_tseg_base();
 	*size = sa_get_tseg_size();
 }
 
+#if CONFIG(SOC_INTEL_COMMON_BLOCK_EBDA)
+void fill_memmap_ebda(struct ebda_config *cfg)
+{
+	struct range_entry tolum;
+
+	fsp_find_bootloader_tolum(&tolum);
+	cfg->cbmem_top = range_entry_end(&tolum);
+}
+
+void cbmem_top_init(void)
+{
+	/* Initialize EBDA area */
+	initialize_ebda_area();
+}
+
+void *cbmem_top_chipset(void)
+{
+	struct ebda_config ebda_cfg;
+
+	retrieve_ebda_object(&ebda_cfg);
+
+	return (void *)(uintptr_t)ebda_cfg.cbmem_top;
+}
+#endif
+
 void fill_postcar_frame(struct postcar_frame *pcf)
 {
 	uintptr_t top_of_ram;