From 7cc6d4e82827fa157cd0618198f72d9e853cac23 Mon Sep 17 00:00:00 2001
From: Michael Mueller <michael.mueller@uos.de>
Date: Mon, 27 Mar 2023 17:11:00 +0200
Subject: [PATCH] base-nova: Added syscall for querying the CPU vendor. This is
 helpful to implement CPU vendor-specific features in userspace drivers.

---
 repos/base-nova/src/core/include/platform.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/repos/base-nova/src/core/include/platform.h b/repos/base-nova/src/core/include/platform.h
index c648c84db9..30addd45d3 100644
--- a/repos/base-nova/src/core/include/platform.h
+++ b/repos/base-nova/src/core/include/platform.h
@@ -20,6 +20,7 @@
 #include <core_mem_alloc.h>
 #include <address_space.h>
 #include <base/allocator.h>
+#include <nova/syscall-generic.h>
 
 namespace Genode {
 
@@ -51,9 +52,13 @@ namespace Genode {
 
 			/* map of virtual cpu ids in Genode to kernel cpu ids */
 			uint8_t map_cpu_ids[MAX_SUPPORTED_CPUS];
+
+			/* map of virtual cpu ids in Genode to kernel NUMA ids */
 			uint8_t cpu_numa_map[MAX_SUPPORTED_CPUS];
+			/* map of kernel NUMA region to Genode memory ranges */
 			Genode::Range_allocator::Range numa_mem_ranges[MAX_SUPPORTED_CPUS]; // TODO: Add new macro for max of numa regions
 
+
 			addr_t _map_pages(addr_t phys_page, addr_t pages,
 			                  bool guard_page = false);
 
@@ -164,6 +169,17 @@ namespace Genode {
 					}
 				}
 			}
+
+			/**
+			 * @brief Return NUMA-interal vendor code for CPU
+			 * 
+			 */
+			Nova::Hip::Cpu_desc::Vendor cpu_vendor() {
+				extern addr_t __initial_sp;
+				Nova::Hip const &hip = *(Nova::Hip *)__initial_sp;
+
+				return static_cast<Nova::Hip::Cpu_desc::Vendor>(hip.cpu_desc_of_cpu(0)->vendor);
+			}
 	};
 }