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  • This comparison shows the changes necessary to convert path 
    /potato/tags/v0.1/benchmarks/sha256
    from Rev 20 to Rev 47
    ↔ Reverse comparison
  •

Rev 20 → Rev 47

/main.c
0,0 → 1,96
// The Potato Processor Benchmark Applications
// (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
// Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
#include <stdbool.h>
#include <stdint.h>
 
#include "platform.h"
#include "potato.h"
 
#include "gpio.h"
#include "sha256.h"
#include "timer.h"
#include "uart.h"
 
static int led_status = 0;
static volatile int hashes_per_second = 0;
 
// Handle an exception/interrupt.
// Arguments:
// - cause: exception cause, see potato.h for values
// - epc: exception return address
// - regbase: base of the stored context, can be used for printing all
// registers with regbase[0] = x1 and upwards.
void exception_handler(uint32_t cause, void * epc, void * regbase)
{
if(cause == (CAUSE_IRQ_BASE + 5)) // Timer interrupt
{
uart_puts(IO_ADDRESS(UART_BASE), "Hashes per second: ");
uart_puth(IO_ADDRESS(UART_BASE), hashes_per_second);
uart_puts(IO_ADDRESS(UART_BASE), "\n\r");
 
if(led_status == 0)
{
gpio_set_output(IO_ADDRESS(GPIO2_BASE), 1);
led_status = 1;
} else {
gpio_set_output(IO_ADDRESS(GPIO2_BASE), 0);
led_status = 0;
}
 
hashes_per_second = 0;
timer_reset(IO_ADDRESS(TIMER_BASE));
} else {
uart_puts(IO_ADDRESS(UART_BASE), "Unhandled exception!\n\r");
uart_puts(IO_ADDRESS(UART_BASE), "Cause: ");
uart_puth(IO_ADDRESS(UART_BASE), cause);
uart_puts(IO_ADDRESS(UART_BASE), "\n\r");
uart_puts(IO_ADDRESS(UART_BASE), "EPC: ");
uart_puth(IO_ADDRESS(UART_BASE), (uint32_t) epc);
uart_puts(IO_ADDRESS(UART_BASE), "\n\r");
 
while(1) asm volatile("nop\n");
}
}
 
int main(void)
{
// Configure GPIOs:
gpio_set_direction(IO_ADDRESS(GPIO1_BASE), 0x0000); // Switches
gpio_set_direction(IO_ADDRESS(GPIO2_BASE), 0xffff); // LEDs
 
// Set up the timer:
timer_set(IO_ADDRESS(TIMER_BASE), SYSTEM_CLK_FREQ);
 
// Print a startup message:
uart_puts(IO_ADDRESS(UART_BASE), "The Potato Processor SHA256 Benchmark\n\r\n\r");
 
// Enable interrupts:
potato_enable_irq(TIMER_IRQ);
potato_enable_interrupts();
 
struct sha256_context context;
 
// Prepare a block for hashing:
uint32_t block[16];
uint8_t * block_ptr = (uint8_t *) block;
block_ptr[0] = 'a';
block_ptr[1] = 'b';
block_ptr[2] = 'c';
sha256_pad_le_block(block_ptr, 3, 3);
 
// Repeatedly hash the same data over and over again:
while(true)
{
uint8_t hash[32];
 
sha256_reset(&context);
sha256_hash_block(&context, block);
sha256_get_hash(&context, hash);
++hashes_per_second;
}
 
return 0;
}
 
/Makefile
0,0 → 1,61
# The Potato Processor Benchmark Applications
# (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
# Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
.PHONY: all clean
 
TARGET_PREFIX ?= riscv64-unknown-elf
TARGET_CC := $(TARGET_PREFIX)-gcc
TARGET_LD := $(TARGET_PREFIX)-ld
TARGET_SIZE := $(TARGET_PREFIX)-size
TARGET_OBJCOPY := $(TARGET_PREFIX)-objcopy
HEXDUMP ?= hexdump
 
TARGET_CFLAGS += -m32 -march=RV32I -Wall -Os -fomit-frame-pointer \
-ffreestanding -fno-builtin -I.. -std=gnu99
TARGET_LDFLAGS += -m elf32lriscv -T../benchmark.ld
 
OBJECTS := gpio.o main.o sha256.o start.o timer.o uart.o utilities.o
 
all: sha256.coe
 
sha256.elf: $(OBJECTS)
$(TARGET_LD) -o sha256.elf $(TARGET_LDFLAGS) $(OBJECTS)
$(TARGET_SIZE) sha256.elf
 
sha256.bin: sha256.elf
$(TARGET_OBJCOPY) -j .text -j .data -O binary sha256.elf sha256.bin
 
sha256.coe: sha256.bin
echo "memory_initialization_radix=16;" > sha256.coe
echo "memory_initialization_vector=" >> sha256.coe
$(HEXDUMP) -v -e '1/4 "%08x\n"' sha256.bin >> sha256.coe
echo ";" >> sha256.coe
 
clean:
-$(RM) $(OBJECTS)
-$(RM) sha256.elf sha256.bin sha256.coe
 
# Object file rules:
 
gpio.o: gpio.c gpio.h ../platform.h
$(TARGET_CC) -c -o $@ $(TARGET_CFLAGS) $<
 
main.o: main.c gpio.h timer.h sha256.h ../platform.h ../potato.h
$(TARGET_CC) -c -o $@ $(TARGET_CFLAGS) $<
 
sha256.o: sha256.c sha256.h
$(TARGET_CC) -c -o $@ $(TARGET_CFLAGS) $<
 
start.o: ../start.S ../platform.h
$(TARGET_CC) -c -o $@ $(TARGET_CFLAGS) $<
 
timer.o: timer.c timer.h ../platform.h
$(TARGET_CC) -c -o $@ $(TARGET_CFLAGS) $<
 
uart.o: uart.c uart.h ../platform.h
$(TARGET_CC) -c -o $@ $(TARGET_CFLAGS) $<
 
utilities.o: utilities.c utilities.h
$(TARGET_CC) -c -o $@ $(TARGET_CFLAGS) $<
 
/sha256.c
0,0 → 1,167
// The Potato Processor Benchmark Applications
// (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
// Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
#include "platform.h"
#include "gpio.h"
 
#include "sha256.h"
 
#define htobe32(n) ((uint32_t) ((n << 24) | ((n << 8) & 0xff0000) | ((n >> 8) & 0xff00) | (n >> 24)))
 
// Software SHA256 module
 
static const uint32_t initial[8] =
{
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
};
 
static const uint32_t constants[64] =
{
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
 
static uint32_t rotate_right(uint32_t x, int n)
{
return (x >> n) | (x << (32 - n));
}
 
static uint32_t Ch(uint32_t x, uint32_t y, uint32_t z)
{
return (x & y) ^ ((~x) & z);
}
 
static uint32_t Maj(uint32_t x, uint32_t y, uint32_t z)
{
return (x & y) ^ (x & z) ^ (y & z);
}
 
static uint32_t s0(uint32_t x)
{
return rotate_right(x, 2) ^ rotate_right(x, 13) ^ rotate_right(x, 22);
}
 
static uint32_t s1(uint32_t x)
{
return rotate_right(x, 6) ^ rotate_right(x, 11) ^ rotate_right(x, 25);
}
 
static uint32_t o0(uint32_t x)
{
return rotate_right(x, 7) ^ rotate_right(x, 18) ^ (x >> 3);
}
 
static uint32_t o1(uint32_t x)
{
return rotate_right(x, 17) ^ rotate_right(x, 19) ^ (x >> 10);
}
 
static uint32_t schedule(uint32_t input, const uint32_t * W, int i)
{
if(i < 16)
return input;
else
return o1(W[i - 2]) + W[i - 7] + o0(W[i - 15]) + W[i - 16];
}
 
static void compress(uint32_t * i, uint32_t W, uint32_t K)
{
uint32_t a = i[0], b = i[1], c = i[2], d = i[3];
uint32_t e = i[4], f = i[5], g = i[6], h = i[7];
 
uint32_t t1 = h + s1(e) + Ch(e, f, g) + K + W;
uint32_t t2 = s0(a) + Maj(a, b, c);
 
h = g;
g = f;
f = e;
e = d + t1;
d = c;
c = b;
b = a;
a = t1 + t2;
 
i[0] = a;
i[1] = b;
i[2] = c;
i[3] = d;
i[4] = e;
i[5] = f;
i[6] = g;
i[7] = h;
}
 
void sha256_reset(struct sha256_context * ctx)
{
for(int i = 0; i < 8; ++i)
ctx->intermediate[i] = initial[i];
}
 
void sha256_hash_block(struct sha256_context * ctx, const uint32_t * data)
{
uint32_t W[64];
uint32_t temp[8];
 
for(int i = 0; i < 8; ++i)
temp[i] = ctx->intermediate[i];
 
for(int i = 0; i < 64; ++i)
{
uint32_t v = i < 16 ? data[i] : 0;
W[i] = schedule(v, W, i);
compress(temp, W[i], constants[i]);
}
 
for(int i = 0; i < 8; ++i)
ctx->intermediate[i] += temp[i];
}
 
void sha256_pad_le_block(uint8_t * block, int block_length, uint64_t total_length)
{
block[block_length] = 0x80; // Add a one to the end of the message;
for(int i = block_length + 1; i < 64; ++i)
block[i] = 0;
 
((uint32_t *) block)[14] = total_length * 8 >> 32;
((uint32_t *) block)[15] = total_length * 8 & 0xffffffff;
 
// Convert the block to big-endian:
for(int i = 0; i < 14; ++i)
((uint32_t *) block)[i] = htobe32(((uint32_t *) block)[i]);
}
 
void sha256_get_hash(const struct sha256_context * ctx, uint8_t * hash)
{
for(int i = 0; i < 8; ++i)
{
// Return the hash in little-endian format:
hash[i * 4 + 3] = (ctx->intermediate[i] >> 0) & 0xff;
hash[i * 4 + 2] = (ctx->intermediate[i] >> 8) & 0xff;
hash[i * 4 + 1] = (ctx->intermediate[i] >> 16) & 0xff;
hash[i * 4 + 0] = (ctx->intermediate[i] >> 24) & 0xff;
}
}
 
void sha256_format_hash(const uint8_t * hash, char * output)
{
static const char * hex_digits = "0123456789abcdef";
for(int i = 0; i < 32; i++)
{
uint8_t h = hash[i];
 
output[i * 2 + 0] = hex_digits[(h >> 4) & 0xf];
output[i * 2 + 1] = hex_digits[h & 0xf];
}
 
output[64] = 0;
}
 
 
/gpio.c
0,0 → 1,23
// The Potato Processor Benchmark Applications
// (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
// Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
#include "gpio.h"
#include "platform.h"
 
void gpio_set_direction(volatile uint32_t * base, uint32_t direction)
{
base[GPIO_DIR >> 2] = direction;
}
 
void gpio_set_output(volatile uint32_t * base, uint32_t output)
{
base[GPIO_OUTPUT >> 2] = output;
}
 
uint32_t gpio_get_value(volatile uint32_t * base)
{
return base[GPIO_INPUT >> 2];
}
 
 
/utilities.h
0,0 → 1,11
// The Potato Processor Benchmark Applications
// (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
// Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
#ifndef UTILITIES_H
#define UTILITIES_H
 
void * memset(void * s, int c, int n);
 
#endif
 
/uart.h
0,0 → 1,17
// The Potato Processor Benchmark Applications
// (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
// Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
#ifndef UART_H
#define UART_H
 
#include <stdint.h>
 
// TODO: Implement the M extension and then write a printf function.
 
void uart_puts(volatile uint32_t * base, const char * s);
void uart_putc(volatile uint32_t * base, char c);
void uart_puth(volatile uint32_t * base, uint32_t n);
 
#endif
 
/timer.c
0,0 → 1,18
// The Potato Processor Benchmark Applications
// (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
// Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
#include "platform.h"
#include "timer.h"
 
void timer_set(volatile uint32_t * base, uint32_t compare)
{
base[TIMER_COMPARE >> 2] = compare;
timer_reset(base);
}
 
void timer_reset(volatile uint32_t * base)
{
base[TIMER_CTRL >> 2] = 1 << TIMER_CTRL_RUN | 1 << TIMER_CTRL_CLEAR;
}
 
/gpio.h
0,0 → 1,18
// The Potato Processor Benchmark Applications
// (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
// Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
#ifndef GPIO_H
#define GPIO_H
 
#include <stdint.h>
 
#define DIRECTION_INPUT 0
#define DIRECTION_OUTPUT 1
 
void gpio_set_direction(volatile uint32_t * base, uint32_t direction);
void gpio_set_output(volatile uint32_t * base, uint32_t output);
uint32_t gpio_get_value(volatile uint32_t * base);
 
#endif
 
/timer.h
0,0 → 1,14
// The Potato Processor Benchmark Applications
// (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
// Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
#ifndef TIMER_H
#define TIMER_H
 
#include <stdint.h>
 
void timer_set(volatile uint32_t * base, uint32_t compare);
void timer_reset(volatile uint32_t * base);
 
#endif
 
/utilities.c
0,0 → 1,14
// The Potato Processor Benchmark Applications
// (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
// Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
#include "utilities.h"
 
void * memset(void * s, int c, int n)
{
char * temp = s;
for(int i = 0; i < n; ++i)
temp[i] = c;
return s;
}
 
/uart.c
0,0 → 1,32
// The Potato Processor Benchmark Applications
// (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
// Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
#include <stdarg.h>
#include <stdbool.h>
 
#include "platform.h"
#include "uart.h"
 
void uart_puts(volatile uint32_t * base, const char * s)
{
for(int i = 0; s[i] != 0; ++i)
uart_putc(base, s[i]);
}
 
void uart_putc(volatile uint32_t * base, char c)
{
// Wait until there is room in the transmit buffer:
while(base[UART_STATUS >> 2] & (1 << 3));
base[UART_TX >> 2] = c & 0x000000ff;
}
 
void uart_puth(volatile uint32_t * base, uint32_t n)
{
static const char * hex_digits = "0123456789abcdef";
uart_putc(base, '0');
uart_putc(base, 'x');
for(int i = 28; i >= 0; i -= 4)
uart_putc(base, hex_digits[(n >> i) & 0xf]);
}
 
/sha256.h
0,0 → 1,31
// The Potato Processor Benchmark Applications
// (c) Kristian Klomsten Skordal 2015 <kristian.skordal@wafflemail.net>
// Report bugs and issues on <http://opencores.org/project,potato,bugtracker>
 
#ifndef SHA256_H
#define SHA256_H
 
#include <stdint.h>
 
struct sha256_context
{
uint32_t intermediate[8];
};
 
// Resets a SHA256 context:
void sha256_reset(struct sha256_context * ctx);
 
// Hash a block of data:
void sha256_hash_block(struct sha256_context * ctx, const uint32_t * data);
 
// Pad a block of data to hash:
void sha256_pad_le_block(uint8_t * block, int block_length, uint64_t total_length);
 
// Get the hash from a SHA256 context:
void sha256_get_hash(const struct sha256_context * ctx, uint8_t * hash);
 
// Formats a hash for printing:
void sha256_format_hash(const uint8_t * hash, char * output);
 
#endif
 

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