mips: Clean-up makefiles

boards/mips-malta/Makefile.include

 export CPU = mips32r2_common
 export INCLUDES += -I$(RIOTBOARD)/$(BOARD)/include/
-export USE_HARD_FLOAT = 1
+#export USE_HARD_FLOAT = 1
 export USE_DSP = 1
+export USE_UHI_SYSCALLS = 1

boards/mips-malta/include/periph_conf.h

@@ -41,16 +41,6 @@ extern "C" {
  */
 #define UART_NUMOF          (0)
 
-/**
- * @brief   Enable DSP context save + restore.
- */
-#define MIPS_DSP            (1)
-
-/**
- * @brief   Enable FPU context save + restore.
- */
-#define MIPS_HARD_FLOAT     (1)
-
 #ifdef __cplusplus
 }
 #endif

boards/pic32-clicker/Makefile.include

 export CPU = mips_pic32mx
 export CPU_MODEL=p32mx470f512h
 export INCLUDES += -I$(RIOTBOARD)/$(BOARD)/include/
-export APPDEPS += $(RIOTCPU)/$(CPU)/$(CPU_MODEL)/$(CPU_MODEL).S
\ No newline at end of file
+export APPDEPS += $(RIOTCPU)/$(CPU)/$(CPU_MODEL)/$(CPU_MODEL).S
+export USE_UHI_SYSCALLS = 1

boards/pic32-wifire/Makefile.include

@@ -2,3 +2,4 @@ export CPU = mips_pic32mz
 export CPU_MODEL=p32mz2048efg100
 export INCLUDES += -I$(RIOTBOARD)/$(BOARD)/include/
 export APPDEPS += $(RIOTCPU)/$(CPU)/$(CPU_MODEL)/$(CPU_MODEL).S
+export USE_UHI_SYSCALLS = 1

cpu/mips32r2_common/Makefile.include

@@ -4,7 +4,6 @@ export APP_START=0x80000000
 
 include $(RIOTMAKE)/arch/mips.inc.mk
 
-export LINKFLAGS += -Tuhi32.ld
 export USEMODULE += periph
 export USEMODULE += newlib
 

cpu/mips32r2_common/newlib_syscalls_mips_uhi/syscalls.c

@@ -12,7 +12,7 @@
   *
   * @file
   * @brief Newlib system call implementation for use with the mips-mti-elf
-  * toolchain newlib incoporating as sem-hosting interface caled 'UHI'
+  * toolchain newlib incorporating as semi-hosting interface called 'UHI'
   *
   * @author Neil Jones <neil.jones@imgtec.com>
   *
@@ -49,7 +49,7 @@ char *heap_top = &_sheap + 4;
 /**
  * @brief Free resources on NewLib de-initialization, not used for RIOT
  */
- 
+
 /* __attribute__((used)) fixes linker errors when building with LTO, but without nano.specs */
 __attribute__((used)) void _fini(void)
 {
@@ -69,7 +69,6 @@ void _exit(int n)
 {
     exit(n);
     pm_off();
-    while(1);
 }
 
 /**

cpu/mips_pic32mx/Makefile.include

-export MEMORY_BASE=0x80000000
-export MEMORY_SIZE=128K
-export APP_START=0x80000000
 export ROMABLE = 1
 
 include $(RIOTMAKE)/arch/mips.inc.mk
@@ -9,7 +6,18 @@ include $(RIOTCPU)/mips_pic32_common/Makefile.include
 # define build specific options
 export CFLAGS += -march=m4k -DSKIP_COPY_TO_RAM
 
+export USEMODULE += mips_pic32_common
 export USEMODULE += periph
+export USEMODULE += newlib
+
+ifeq ($(USE_UHI_SYSCALLS),1)
+  #Use UHI to handle syscalls
+  export LINKFLAGS += -luhi
+  export USEMODULE += newlib_syscalls_mips_uhi
+else
+  #Use RIOT to handle syscalls (default)
+  export USEMODULE += newlib_syscalls_default
+endif
 
 export LINKFLAGS += -Wl,--defsym,__use_excpt_boot=0 $(CFLAGS)
 export LINKFLAGS += -Tpic32mx512_12_128_uhi.ld

cpu/mips_pic32mz/Makefile.include

-export MEMORY_BASE=0x80000000
-export MEMORY_SIZE=512K
-export APP_START=0x80000000
 export ROMABLE = 1
 
 include $(RIOTMAKE)/arch/mips.inc.mk
@@ -10,7 +7,19 @@ include $(RIOTCPU)/mips_pic32_common/Makefile.include
 export CFLAGS += -march=m5101 -mmicromips -DSKIP_COPY_TO_RAM
 export CFLAGS += -DMIPS_MICROMIPS
 
+export USEMODULE += mips_pic32_common
 export USEMODULE += periph
+export USEMODULE += newlib
+
+ifeq ($(USE_UHI_SYSCALLS),1)
+  #Use UHI to handle syscalls
+  export LINKFLAGS += -luhi
+  export USEMODULE += newlib_syscalls_mips_uhi
+else
+  #Use RIOT to handle syscalls (default)
+  export USEMODULE += newlib_syscalls_default
+endif
+
 
 export LINKFLAGS += -Wl,--defsym,__use_excpt_boot=0 $(CFLAGS)
 export LINKFLAGS += -Tpic32mz2048_uhi.ld

makefiles/arch/mips.inc.mk

@@ -41,7 +41,7 @@ export CFLAGS_OPT   = -Os
 export CFLAGS += $(CFLAGS_CPU) $(CFLAGS_LINK) $(CFLAGS_OPT) $(CFLAGS_DBG)
 
 ifeq ($(USE_HARD_FLOAT),1)
-    export CFLAGS += -mhard-float
+    export CFLAGS += -mhard-float -DMIPS_HARD_FLOAT
 else
     #hard-float is the default so we must set soft-float
     export CFLAGS += -msoft-float
@@ -49,7 +49,7 @@ else
 endif
 
 ifeq ($(USE_DSP),1)
-    export CFLAGS += -mdsp
+    export CFLAGS += -mdsp -DMIPS_DSP
 endif
 
 ifeq ($(TOOLCHAIN),llvm)