From 9a47daa5327db543ab1b641d6b62e5e20177def8 Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Tue, 17 Apr 2018 22:11:59 +0200
Subject: [PATCH] Fix mips32 identification and add MIPS 1004K (MT7621 SoC)

---
 Makefile.prebuild |  4 ++++
 Makefile.system   | 34 +++++++++++++++++++++++----------
 cpuid_mips.c      | 48 ++++++++++++++++++++++++-----------------------
 3 files changed, 53 insertions(+), 33 deletions(-)

diff --git a/Makefile.prebuild b/Makefile.prebuild
index daa556f65..a366004a1 100644
--- a/Makefile.prebuild
+++ b/Makefile.prebuild
@@ -17,6 +17,10 @@ ifdef CPUIDEMU
 EXFLAGS = -DCPUIDEMU -DVENDOR=99
 endif
 
+ifeq ($(TARGET), 1004K)
+TARGET_FLAGS = -mips32r2
+endif
+
 ifeq ($(TARGET), P5600)
 TARGET_FLAGS = -mips32r5
 endif
diff --git a/Makefile.system b/Makefile.system
index 9720b317f..fdc408781 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -17,15 +17,24 @@ NETLIB_LAPACK_DIR = $(TOPDIR)/lapack-netlib
 #   http://stackoverflow.com/questions/4029274/mingw-and-make-variables
 # - Default value is 'cc' which is not always a valid command (e.g. MinGW).
 ifeq ($(origin CC),default)
+
+# Check if $(CC) refers to a valid command and set the value to gcc if not
+ifneq ($(findstring cmd.exe,$(SHELL)),)
+ifeq ($(shell where $(CC) 2>NUL),)
 CC = gcc
-# Change the default compile to clang on Mac OSX.
-# http://stackoverflow.com/questions/714100/os-detecting-makefile
-UNAME_S := $(shell uname -s)
-ifeq ($(UNAME_S),Darwin)
-     CC = clang
-#     EXTRALIB += -Wl,-no_compact_unwind
-endif
 endif
+else # POSIX-ish
+ifeq ($(shell command -v $(CC) 2>/dev/null),)
+ifeq ($(shell uname -s),Darwin)
+CC = clang
+# EXTRALIB += -Wl,-no_compact_unwind
+else
+CC = gcc
+endif # Darwin
+endif # CC exists
+endif # Shell is sane
+
+endif # CC is set to default
 
 # Default Fortran compiler (FC) is selected by f_check.
 
@@ -230,7 +239,7 @@ endif
 MD5SUM = md5 -r
 endif
 
-ifeq ($(OSNAME), FreeBSD)
+ifneq (,$(findstring $(OSNAME), FreeBSD OpenBSD DragonFly))
 MD5SUM = md5 -r
 endif
 
@@ -555,9 +564,14 @@ CCOMMON_OPT += -march=mips64
 FCOMMON_OPT += -march=mips64
 endif
 
+ifeq ($(CORE), 1004K)
+CCOMMON_OPT += -mips32r2   $(MSA_FLAGS)
+FCOMMON_OPT += -mips32r2   $(MSA_FLAGS)
+endif
+
 ifeq ($(CORE), P5600)
-CCOMMON_OPT += -mips32r5 -mnan=2008 -mtune=p5600 $(MSA_FLAGS)
-FCOMMON_OPT += -mips32r5 -mnan=2008 -mtune=p5600 $(MSA_FLAGS)
+CCOMMON_OPT += -mips32r5   $(MSA_FLAGS)
+FCOMMON_OPT += -mips32r5   $(MSA_FLAGS)
 endif
 
 ifeq ($(CORE), I6400)
diff --git a/cpuid_mips.c b/cpuid_mips.c
index 15c58959e..760ddee51 100644
--- a/cpuid_mips.c
+++ b/cpuid_mips.c
@@ -72,10 +72,16 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #define CPU_UNKNOWN     0
 #define CPU_P5600       1
+#define CPU_LOONGSON3A   2
+#define CPU_LOONGSON3B   3
+#define CPU_1004K	4
 
 static char *cpuname[] = {
   "UNKOWN",
-  "P5600"
+  "P5600",
+  "LOONGSON3A",
+  "LOONGSON3B",
+  "1004K"
 };
 
 int detect(void){
@@ -90,7 +96,7 @@ int detect(void){
     if (!strncmp("cpu", buffer, 3)){
 	p = strchr(buffer, ':') + 2;
 #if 0
-	fprintf(stderr, "%s\n", p);
+	fprintf(stderr, "%s \n", p);
 #endif
 	break;
       }
@@ -115,27 +121,13 @@ int detect(void){
     fclose(infile);
     if (strstr(p, "loongson3a"))
       return CPU_LOONGSON3A;
-  }else{
+  }else if (strstr(p, "5600")) {
+    return CPU_P5600;
+  } else if (strstr(p, "1004K")) {
+      return CPU_1004K;
+  } else  
     return CPU_UNKNOWN;
   }
-  }
-  //Check model name for Loongson3
-  infile = fopen("/proc/cpuinfo", "r");
-  p = (char *)NULL;
-  while (fgets(buffer, sizeof(buffer), infile)){
-    if (!strncmp("model name", buffer, 10)){
-      p = strchr(buffer, ':') + 2;
-      break;
-    }
-  }
-  fclose(infile);
-  if(p != NULL){
-  if (strstr(p, "Loongson-3A")){
-    return CPU_LOONGSON3A;
-  }else if(strstr(p, "Loongson-3B")){
-    return CPU_LOONGSON3B;
-  }
-  }
 #endif
     return CPU_UNKNOWN;
 }
@@ -149,7 +141,7 @@ void get_architecture(void){
 }
 
 void get_subarchitecture(void){
-  if(detect()==CPU_P5600){
+  if(detect()==CPU_P5600|| detect()==CPU_1004K){
     printf("P5600");
   }else{
     printf("UNKNOWN");
@@ -161,7 +153,7 @@ void get_subdirname(void){
 }
 
 void get_cpuconfig(void){
-  if(detect()==CPU_P5600){
+  if(detect()==CPU_P5600 || detect()==CPU_1004K){
     printf("#define P5600\n");
     printf("#define L1_DATA_SIZE 65536\n");
     printf("#define L1_DATA_LINESIZE 32\n");
@@ -170,6 +162,14 @@ void get_cpuconfig(void){
     printf("#define DTB_DEFAULT_ENTRIES 64\n");
     printf("#define DTB_SIZE 4096\n");
     printf("#define L2_ASSOCIATIVE 8\n");
+  } else if (detect()==CPU_1004K) {
+    printf("#define 1004K\n");
+    printf("#define L1_DATA_SIZE 32768\n");
+    printf("#define L1_DATA_LINESIZE 32\n");
+    printf("#define L2_SIZE 26144\n");
+    printf("#define DTB_DEFAULT_ENTRIES 8\n");
+    printf("#define DTB_SIZE 4096\n");
+    printf("#define L2_ASSOCIATIVE 4\n");
   }else{
     printf("#define UNKNOWN\n");
   }
@@ -178,6 +178,8 @@ void get_cpuconfig(void){
 void get_libname(void){
   if(detect()==CPU_P5600) {
     printf("p5600\n");
+  } else if (detect()==CPU_1004K) {
+    printf("1004K\n");
   }else{
     printf("mips\n");
   }