Remove legacy examples

Signed-off-by: Nathaniel Graff <nathaniel.graff@sifive.com>

2 files changed, 0 insertions, 139 deletions

diff --git a/software/performance_counters/Makefile b/software/performance_counters/Makefile
deleted file mode 100644
index eb3e8f1..0000000
--- a/software/performance_counters/Makefile
+++ /dev/null
@@ -1,6 +0,0 @@
-TARGET = performance_counters
-C_SRCS += performance_counters.c
-CFLAGS += -O2 -fno-builtin-printf
-
-BSP_BASE = ../../bsp
-include $(BSP_BASE)/env/common.mk
diff --git a/software/performance_counters/performance_counters.c b/software/performance_counters/performance_counters.c
deleted file mode 100644
index 8094128..0000000
--- a/software/performance_counters/performance_counters.c
+++ /dev/null
@@ -1,133 +0,0 @@
-// See LICENSE for license details.
-
-// This demo shows how to use basic
-// RISC-V profiling counters, mcycle
-// (counts the number of processor cycles)
-// and minstret (counts the number of retired instructions). 
-// Note that both are writable as well.
-
-#include <stdio.h>
-
-// The CSR encodings are in this header.
-#include "encoding.h"
-
-// The mcycle counter is 64-bit counter, but since
-// Freedom E platforms use RV32, we must access it as
-// 2 32-bit registers. At 256MHz, the lower bits will
-// roll over approx. every 5 seconds, so we check for
-// rollover with this routine as suggested by the
-// RISC-V Priviledged Architecture Specification.
-
-#if __riscv_xlen == 64
-#define rdmcycle(x)  {					\
-    uint64_t hi;					\
-    __asm__ __volatile__ ("1:\n\t"			\
-			  "csrr %0, mcycle\n\t"		\
-			  : "=r" (hi)) ;		\
-    *(x) = hi;		 				\
-  }
-#else
-#define rdmcycle(x)  {				       \
-    uint32_t lo, hi, hi2;			       \
-    __asm__ __volatile__ ("1:\n\t"		       \
-			  "csrr %0, mcycleh\n\t"       \
-			  "csrr %1, mcycle\n\t"	       \
-			  "csrr %2, mcycleh\n\t"       \
-			  "bne  %0, %2, 1b\n\t"			\
-			  : "=r" (hi), "=r" (lo), "=r" (hi2)) ;	\
-    *(x) = lo | ((uint64_t) hi << 32); 				\
-  }
-#endif
-
-
-// The minstret counter is 64-bit counter, but
-// Freedom E platforms use RV32, we must access it as
-// 2 32-bit registers, same as for mcycle.
-
-#if __riscv_xlen == 64
-#define rdminstret(x)  {				\
-    uint64_t hi;					\
-    __asm__ __volatile__ ("1:\n\t"			\
-			  "csrr %0, minstret\n\t"	\
-			  : "=r" (hi)) ;		\
-    *(x) = hi;						\
-  }
-#else
-#define rdminstret(x)  {			       \
-    uint32_t lo, hi, hi2;			       \
-    __asm__ __volatile__ ("1:\n\t"		       \
-			  "csrr %0, minstreth\n\t"       \
-			  "csrr %1, minstret\n\t"	       \
-			  "csrr %2, minstreth\n\t"       \
-			  "bne  %0, %2, 1b\n\t"			\
-			  : "=r" (hi), "=r" (lo), "=r" (hi2)) ;	\
-    *(x) = lo | ((uint64_t) hi << 32); 				\
-  }
-#endif
-
-// Simple program to measure the performance of.
-
-int factorial(int i){
-
-  int result = 1;
-  for (int ii = 1; ii <= i; ii++) {
-    result = result * i;
-  }
-
-  return result;
-  
-}
-
-
-int main()
-{
-
-  uint64_t before_cycle;
-  uint64_t before_instret;
-  
-  uint64_t after_cycle;
-  uint64_t after_instret;
-    
-  printf("\n\nDemo 1: Using Counter Differences.\n");
-  
-  for (int ii = 0; ii < 3; ii++){
-    rdmcycle(&before_cycle);
-    rdminstret(&before_instret);
-
-    volatile int result = factorial (100);
-    
-    rdmcycle(&after_cycle);
-    rdminstret(&after_instret);
-    
-    printf("Loop %d: Retired %d instructions in %d cycles\n",
-	   ii,
-	   (uint32_t)(after_instret - before_instret), 
-	   (uint32_t)(after_cycle - before_cycle));
-  }
-
-  printf("\n\nDemo 2: Clearing Counters, Using Values Directly.\n");
-
-  for (int ii = 0; ii < 3; ii++){
-
-    write_csr(mcycle,  0);
-    write_csr(minstret, 0);
-#if __riscv_xlen == 32
-    write_csr(mcycleh, 0);
-    write_csr(minstreth, 0);
-#endif
-    
-    volatile int result = factorial (100);
-    
-    rdmcycle(&after_cycle);
-    rdminstret(&after_instret);
-    
-    printf("Loop %d: Retired %d instructions in %d cycles\n",
-	   ii,
-	   (uint32_t)(after_instret),
-	   (uint32_t)(after_cycle));
-
-  }
-
-  return 0;
-
-}