Merge pull request #3073 from xoviat/embedded

add embedded option

.gitignore

@@ -91,3 +91,4 @@ benchmark/*.goto
 benchmark/smallscaling
 CMakeCache.txt
 CMakeFiles/*
+.vscode

README.md

@@ -212,7 +212,8 @@ Please note that it is not possible to combine support for different architectur
 - **Android**: Supported by the community. Please read <https://github.com/xianyi/OpenBLAS/wiki/How-to-build-OpenBLAS-for-Android>.
 - **AIX**: Supported on PPC up to POWER8
 - **Haiku**: Supported by the community. We don't actively test the library on this OS.
-- **SunOS**: Supported by the community. We don't actively test the library on this OS:
+- **SunOS**: Supported by the community. We don't actively test the library on this OS.
+- **Cortex-M**: Supported by the community. Please read <https://github.com/xianyi/OpenBLAS/wiki/How-to-use-OpenBLAS-on-Cortex-M>.
 
 ## Usage
 

cmake/system.cmake

@@ -233,6 +233,11 @@ if (BINARY64)
   endif ()
 endif ()
 
+if(EMBEDDED)
+  set(CCOMMON_OPT "${CCOMMON_OPT} -DOS_EMBEDDED")
+  set(CCOMMON_OPT "${CCOMMON_OPT} -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16")
+endif()
+
 if (NEED_PIC)
   if (${CMAKE_C_COMPILER} STREQUAL "IBM")
     set(CCOMMON_OPT "${CCOMMON_OPT} -qpic=large")

common.h

@@ -122,7 +122,7 @@ extern "C" {
 #define ATOM GOTO_ATOM
 #undef  GOTO_ATOM
 #endif
-#else
+#elif !defined(OS_EMBEDDED)
 #include <sys/mman.h>
 #ifndef NO_SYSV_IPC
 #include <sys/shm.h>
@@ -134,6 +134,9 @@ extern "C" {
 #if defined(SMP) || defined(USE_LOCKING)
 #include <pthread.h>
 #endif
+#else
+#include <time.h>
+#include <math.h>
 #endif
 
 #if defined(OS_SUNOS)
@@ -488,10 +491,12 @@ static inline unsigned long long rpcc(void){
   struct timespec ts;
   clock_gettime(CLOCK_MONOTONIC, &ts);
   return (unsigned long long)ts.tv_sec * 1000000000ull + ts.tv_nsec;
-#else
+#elif !defined(OS_EMBEDDED)
   struct timeval tv;
   gettimeofday(&tv,NULL);
   return (unsigned long long)tv.tv_sec * 1000000000ull + tv.tv_usec * 1000;
+#else
+  return 0;
 #endif
 }
 #define RPCC_DEFINED
@@ -521,6 +526,10 @@ static void __inline blas_lock(volatile BLASULONG *address){
 #include "common_linux.h"
 #endif
 
+#ifdef OS_EMBEDDED
+#define DTB_DEFAULT_ENTRIES 64
+#endif
+
 #define MMAP_ACCESS (PROT_READ | PROT_WRITE)
 
 #ifdef __NetBSD__

driver/others/memory.c

@@ -1668,16 +1668,23 @@ void gotoblas_dummy_for_PGI(void) {
 #ifndef MEM_LARGE_PAGES
 #define MEM_LARGE_PAGES  0x20000000
 #endif
-#else
+#elif !defined(OS_EMBEDDED)
 #define ALLOC_MMAP
 #define ALLOC_MALLOC
+#else
+#define ALLOC_MALLOC
+
+inline int puts(const char *str) { return 0; }
+inline int printf(const char *format, ...) { return 0; }
+inline char *getenv(const char *name) { return ""; }
+inline int atoi(const char *str) { return 0; }
 #endif
 
 #include <stdlib.h>
 #include <stdio.h>
 #include <fcntl.h>
 
-#if !defined(OS_WINDOWS) || defined(OS_CYGWIN_NT)
+#if (!defined(OS_WINDOWS) || defined(OS_CYGWIN_NT)) && !defined(OS_EMBEDDED)
 #include <sys/mman.h>
 #ifndef NO_SYSV_IPC
 #include <sys/shm.h>