soc/intel/xeon_sp: Add get_system_memory_map()

Prepare for common ACPI. Add get_system_memory_map() helper
function to soc_util.c and use it in the SRAT ACPI code
to match the cpx code.

Change-Id: I54675b52aaf2999d884b3c20ccb143fbbf8b138a
Signed-off-by: Marc Jones <marcjones@sysproconsulting.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45847
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Jay Talbott <JayTalbott@sysproconsulting.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/xeon_sp/skx/include/soc/soc_util.h

@@ -30,6 +30,7 @@ void get_core_thread_bits(uint32_t *core_bits, uint32_t *thread_bits);
 void get_cpu_info_from_apicid(uint32_t apicid, uint32_t core_bits,
 	uint32_t thread_bits, uint8_t *package, uint8_t *core, uint8_t *thread);
 
+const struct SystemMemoryMapHob *get_system_memory_map(void);
 void xeonsp_init_cpu_config(void);
 void set_bios_init_completion(void);
 void config_reset_cpl3_csrs(void);

src/soc/intel/xeon_sp/skx/soc_acpi.c

@@ -179,13 +179,11 @@ unsigned long acpi_create_srat_lapics(unsigned long current)
 static unsigned int get_srat_memory_entries(acpi_srat_mem_t *srat_mem)
 {
 	const struct SystemMemoryMapHob *memory_map;
-	size_t hob_size;
-	const uint8_t mem_hob_guid[16] = FSP_SYSTEM_MEMORYMAP_HOB_GUID;
 	unsigned int mmap_index;
 
-	memory_map = fsp_find_extension_hob_by_guid(mem_hob_guid, &hob_size);
-	assert(memory_map != NULL && hob_size != 0);
-	printk(BIOS_DEBUG, "FSP_SYSTEM_MEMORYMAP_HOB_GUID hob_size: %ld\n", hob_size);
+	memory_map = get_system_memory_map();
+	assert(memory_map != NULL);
+	printk(BIOS_DEBUG, "memory_map: %p\n", memory_map);
 
 	mmap_index = 0;
 	for (int e = 0; e < memory_map->numberEntries; ++e) {

src/soc/intel/xeon_sp/skx/soc_util.c

@@ -373,6 +373,17 @@ void get_iiostack_info(struct iiostack_resource *info)
 }
 
 #if ENV_RAMSTAGE
+const struct SystemMemoryMapHob *get_system_memory_map(void)
+{
+	size_t hob_size;
+	const uint8_t mem_hob_guid[16] = FSP_SYSTEM_MEMORYMAP_HOB_GUID;
+	const struct SystemMemoryMapHob *memmap_addr;
+
+	memmap_addr = fsp_find_extension_hob_by_guid(mem_hob_guid, &hob_size);
+	assert(memmap_addr != NULL && hob_size != 0);
+
+	return memmap_addr;
+}
 
 void xeonsp_init_cpu_config(void)
 {