rewrite-rom works, but maps things improperly sometimes

Signed-off-by: Sean Cross <sean@xobs.io>
This commit is contained in:
Sean Cross 2019-02-22 17:18:41 +08:00
parent 7d2f99e899
commit 635a9a2d48
5 changed files with 403 additions and 19 deletions

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@ -5,6 +5,7 @@
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#define MAX(x, y) (x) > (y) ? (x) : (y)
@ -28,14 +29,6 @@ static void update_crc16(uint16_t *crc, uint8_t byte)
}
}
static uint8_t reverse_u8(uint8_t b)
{
b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
return b;
}
struct irw_file *irw_open(const char *filename, const char *mode)
{
struct irw_file *f = malloc(sizeof(*f));
@ -53,6 +46,11 @@ int irw_readb(struct irw_file *f)
return val;
}
int irw_writeb(struct irw_file *f, int c) {
update_crc16(&f->crc, c);
return fputc(c, f->f);
}
struct Ice40Bitstream
{
uint32_t offset;
@ -73,16 +71,14 @@ struct Ice40Bitstream
uint8_t nosleep;
uint8_t frequency_range;
uint8_t bram_banks[4][2560 * 2];
};
struct Ice40Bitstream bs;
int ice40_find_header(struct irw_file *f)
int ice40_parse(struct irw_file *f)
{
uint32_t preamble = 0;
uint8_t wakeup = 0;
struct Ice40Bitstream bs;
memset(&bs, 0, sizeof(bs));
@ -186,8 +182,6 @@ int ice40_find_header(struct irw_file *f)
// try_4[i] = try_4[i + 1];
// try_4[i + 1] = t;
// }
printf("try 1:\n");
print_hex(try_1, sizeof(try_1), 0);
// printf("try 2:\n");
// print_hex(try_2, sizeof(try_2), 0);
// printf("try 3:\n");
@ -222,7 +216,7 @@ int ice40_find_header(struct irw_file *f)
// printf("setting bank number to %d\n", bs.current_bank);
break;
case 2:
printf("crc check (%04x == %04x)\n", f->crc, 0);
printf("crc check (%04x == %04x)\n", f->crc, payload);
break;
case 5:
switch (payload)
@ -287,14 +281,399 @@ int ice40_find_header(struct irw_file *f)
return 0;
}
struct mapping {
uint32_t count;
uint32_t *mappings;
};
static void add_mapping(struct mapping *mapping, uint32_t src, uint32_t dest) {
mapping->mappings = realloc(mapping->mappings, (mapping->count+1) * 2 * sizeof(uint32_t));
mapping->mappings[mapping->count * 2] = src;
mapping->mappings[mapping->count * 2 + 1] = dest;
printf("creating mapping %08x -> %08x\n", src, dest);
mapping->count++;
}
static uint32_t get_mapping(const struct mapping *mapping, uint32_t val) {
int i;
for (i = 0; i < mapping->count; i++) {
if (mapping->mappings[i * 2] == val) {
printf("found mapping for %08x: %08x\n", val, mapping->mappings[i * 2 + 1]);
return mapping->mappings[i * 2 + 1];
}
}
printf("couldn't find mapping for %08x\n", val);
return -1;
}
uint8_t get_bit(uint32_t *field, uint32_t offset)
{
// printf("offset&31: %d\n", offset & 31);
// printf("offset/sizeof(*field): %d\n", offset >> 5);
assert(offset < 65536);
return !!(field[offset >> 5] & (1 << (offset & 31)));
}
void set_bit(uint32_t *field, uint32_t offset)
{
assert(offset < 65536);
field[offset >> 5] |= (1 << (offset & 31));
}
void clear_bit(uint32_t *field, uint32_t offset)
{
assert(offset < 65536);
field[offset >> 5] &= ~(1 << (offset & 31));
}
static uint32_t get_bit_offset(int x, int total_bits) {
// return (8192 * (x & 7)) + (x >> 3);
int bitshift = ffs(total_bits)-1;
return ((x * 8192) % total_bits) + ((x*8192) >> bitshift);
}
uint32_t xorshift32(uint32_t x)
{
/* Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs" */
x = x ^ (x << 13);
x = x ^ (x >> 17);
x = x ^ (x << 5);
return x;
}
uint32_t get_rand(uint32_t x) {
uint32_t out = 0;
int i;
for (i = 0; i < 32; i++) {
x = xorshift32(x);
if ((x & 1) == 1)
out = out | (1 << i);
}
return out;
}
static uint32_t fill_rand(uint32_t *bfr, int count) {
int i;
uint32_t last = 1;
for (i = 0; i < count / 4; i++) {
last = get_rand(last);
bfr[i] = last;
}
return i;
}
uint32_t swap_u32(uint32_t word) {
return (((word >> 24) & 0x000000ff)
| ((word >> 8) & 0x0000ff00)
| ((word << 8) & 0x00ff0000)
| ((word << 24) & 0xff000000));
}
// 1. Read ROM file into `input`
// 2. For each pair of bytes of input,
uint16_t mappings[65536];
int ice40_patch(struct irw_file *f, struct irw_file *rom, struct irw_file *o)
{
uint32_t preamble = 0;
uint8_t wakeup = 0;
struct Ice40Bitstream bs;
uint32_t input_rom[2048];
uint32_t input_rand[2048];
uint32_t output_rand[2048];
uint32_t output_rom[2048];
uint8_t *i8 = (uint8_t *)input_rom;
uint16_t *ora16 = (uint16_t *)output_rand;
uint16_t *oro16 = (uint16_t *)output_rom;
int b;
struct mapping mapping;
memset(&mapping, 0, sizeof(mapping));
memset(&bs, 0, sizeof(bs));
int input_ptr;
// Read the ROM into a source buffer
memset(input_rom, 0, sizeof(input_rom));
input_ptr = 0;
while ((b = irw_readb(rom)) != EOF)
i8[input_ptr++] = b;
printf("read %d bytes from rom\n", input_ptr);
// Generate our reference pattern
memset(input_rand, 0, sizeof(input_rand));
fill_rand(input_rand, sizeof(input_rand));
for (input_ptr = 0; input_ptr < sizeof(input_rom)/4; input_ptr++) {
// input_rand[input_ptr] = swap_u32(input_rand[input_ptr]);
// input_rom[input_ptr] = swap_u32(input_rom[input_ptr]);
}
// Spray the reference pattern and ROM like they would exist in the FPGA
for (input_ptr = 0; input_ptr < sizeof(input_rom) * 8; input_ptr++) {
int bit;
bit = get_bit(input_rand, get_bit_offset(input_ptr, sizeof(input_rand)*8));
if (bit)
set_bit(output_rand, input_ptr);
else
clear_bit(output_rand, input_ptr);
bit = get_bit(input_rom, get_bit_offset(input_ptr, sizeof(input_rom)*8));
if (bit)
set_bit(output_rom, input_ptr);
else
clear_bit(output_rom, input_ptr);
}
// Finally, build a mapping from the random data to the replacement rom data.
uint32_t collisions = 0;
for (input_ptr = 0; input_ptr < 4096; input_ptr += 1) {
// uint32_t ra1 = (output_rand[input_ptr + 0] & 0xffff0000)
// | ((output_rand[input_ptr + 1] >> 16) & 0x0000ffff);
// uint32_t ra2 = (output_rand[input_ptr + 1] & 0xffff0000)
// | ((output_rand[input_ptr + 0] >> 16) & 0x0000ffff);
// add_mapping(&mapping, ra1, output_rom[input_ptr + 0]);
// add_mapping(&mapping, ra2, output_rom[input_ptr + 1]);
if (mappings[ora16[input_ptr]]) {
collisions++;
printf("mapping position %d not empty\n", input_ptr);
}
mappings[ora16[input_ptr]] = oro16[input_ptr];
}
if (collisions)
printf("had %d collisions\n", collisions);
while (1)
{
b = irw_readb(f);
if (b == EOF)
break;
irw_writeb(o, b);
preamble = (preamble << 8) | b;
if (preamble == 0x7eaa997e)
{
// printf("found preamble at %d\n", bs.offset);
break;
}
}
while (!wakeup)
{
int b = irw_readb(f);
if (b == EOF)
{
// printf("reached end of file\n");
break;
}
irw_writeb(o, b);
uint8_t cmd = b >> 4;
uint8_t payload_len = b & 0xf;
uint32_t payload = 0;
uint8_t last0, last1;
int i;
for (i = 0; i < payload_len; i++)
{
b = irw_readb(f);
payload = (payload << 8) | (b & 0xff);
// Don't write the CRC16 out, since we'll do that later on.
if (cmd != 2)
irw_writeb(o, b);
}
switch (cmd)
{
case 0:
switch (payload)
{
case 1:
printf("CRAM data (bank %d): %d x %d @ 0x%08x; %d bits = %d bytes\n",
bs.current_bank,
bs.current_width,
bs.current_height,
bs.current_offset,
bs.current_width * bs.current_height,
(bs.current_width * bs.current_height) / 8);
bs.cram_width = MAX(bs.cram_width, bs.current_width);
bs.cram_height = MAX(bs.cram_height, bs.current_height);
for (i = 0; i < ((bs.current_width * bs.current_height) / 8); i++)
{
irw_writeb(o, irw_readb(f));
}
last0 = irw_readb(f);
last1 = irw_readb(f);
if (last0 || last1)
{
printf("expected 0x0000 after CRAM data, got %02x %02x\n", last0, last1);
}
irw_writeb(o, last0);
irw_writeb(o, last1);
break;
case 3:
printf("BRAM data (bank %d): %d x %d @ 0x%08x; %d bits = %d bytes\n",
bs.current_bank,
bs.current_width,
bs.current_height,
bs.current_offset,
bs.current_width * bs.current_height,
(bs.current_width * bs.current_height) / 8);
bs.bram_width = MAX(bs.bram_width, bs.current_width);
bs.bram_height = MAX(bs.bram_height, bs.current_height);
for (i = 0; i < ((bs.current_width * bs.current_height) / 8); i += 2)
{
uint32_t word =
// ((irw_readb(f) << 24) & 0xff000000)
// |
// ((irw_readb(f) << 16) & 0x00ff0000)
// |
((irw_readb(f) << 8) & 0x0000ff00)
|
((irw_readb(f) << 0) & 0x000000ff)
;
// printf("%04x -> %04x\n", word, mapping[word]);
// word = get_mapping(&mapping, word);
// irw_writeb(o, word >> 24);
// irw_writeb(o, word >> 16);
word = mappings[word];
irw_writeb(o, word >> 8);
irw_writeb(o, word);
}
last0 = irw_readb(f);
last1 = irw_readb(f);
if (last0 || last1)
{
printf("expected 0x0000 after BRAM data, got %02x %02x\n", last0, last1);
}
irw_writeb(o, last0);
irw_writeb(o, last1);
break;
// Reset CRC
case 5:
f->crc = 0xffff;
o->crc = 0xffff;
break;
// Wakeup
case 6:
wakeup = 1;
break;
default:
printf("unrecognized command 0x%02x 0x%02x\n", cmd, payload);
break;
}
break;
// Set current bank
case 1:
bs.current_bank = payload;
// printf("setting bank number to %d\n", bs.current_bank);
break;
// Validate CRC16
case 2:
printf("crc check (%04x == %04x)\n", f->crc, 0);
uint16_t crc16 = o->crc;
irw_writeb(o, crc16 >> 8);
irw_writeb(o, crc16);
break;
// Set frequency range
case 5:
switch (payload)
{
case 0:
bs.frequency_range = 0;
break;
case 1:
bs.frequency_range = 1;
break;
case 2:
bs.frequency_range = 2;
break;
default:
printf("unknown frequency range payload: %02x\n", payload);
break;
}
break;
// Set current width
case 6:
bs.current_width = payload + 1;
break;
// Set current height
case 7:
bs.current_height = payload;
break;
// Set current ofset
case 8:
bs.current_offset = payload;
break;
// Set flags
case 9:
switch (payload)
{
case 0:
bs.warmboot = 0;
bs.nosleep = 0;
break;
case 1:
bs.warmboot = 0;
bs.nosleep = 1;
break;
case 32:
bs.warmboot = 1;
bs.nosleep = 0;
break;
case 33:
bs.warmboot = 1;
bs.nosleep = 1;
break;
default:
printf("unrecognized feature flags: %02x\n", payload);
break;
}
break;
default:
printf("unrecognized command: %02x\n", cmd);
break;
}
}
// Padding
irw_writeb(o, 0);
return 0;
}
int main(int argc, char **argv)
{
struct irw_file *f = irw_open("memtest/memtest.bin", "r");
if (!f)
struct irw_file *input = irw_open("top.bin", "r");
struct irw_file *output = irw_open("new.bin", "w");
struct irw_file *rom = irw_open("rom.bin", "r");
// int i;
// for (i = 0; i < 32; i++) {
// printf("bit %d: %d\n", i, get_bit_offset(i, 8192*8));
// }
if (!input)
{
perror("couldn't open top.bin");
return 1;
}
ice40_find_header(f);
if (!output) {
perror("couldn't open new.bin");
return 2;
}
ice40_patch(input, rom, output);
return 0;
}

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samerand

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@ -1,5 +1,8 @@
#include <stdio.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
uint32_t xorshift32(uint32_t x)
{
@ -24,10 +27,12 @@ uint32_t get_rand(uint32_t x) {
int main(int argc, char **argv) {
int i;
int fd = open("rom.bin", O_WRONLY | O_CREAT | O_TRUNC, 0777);
uint32_t init = 1;
for (i = 0; i < 2048; i++) {
init = get_rand(init);
printf("%08x\n", init);
// printf("%08x\n", init);
write(fd, &init, sizeof(init));
}
return 0;

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top.bin

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