The patch converts jedec functions into mask-based generics which can be
used for many chip provided the only changes are the the addresses are
converted from 0x5555/0x2AAA to 0x555/0x2AA or similar. These functions
won't work for the 0xAAA chips listed above, but most of listed chips
should work with these changes. The other changes I suggested will come
in later patches, and the writing functions are untouched since we'll
move to a block writers system. The patch mostly changes jedec.c, but a
few other files are changed because they use the jedec functions within
their own functions.
The patch also adds a copyright line to flashchips.c because of my
recent work in converting AMD and Atmel chips to use struct erase_block.
Signed-off-by: Sean Nelson <[email protected]>
diff --git a/chipdrivers.h b/chipdrivers.h
index adcb46d..4456204 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -72,26 +72,24 @@ int probe_en29f002a(struct flashchip *flash);
int erase_en29f002a(struct flashchip *flash);
int write_en29f002a(struct flashchip *flash, uint8_t *buf);
/* jedec.c */
uint8_t oddparity(uint8_t val);
void toggle_ready_jedec(chipaddr dst);
void data_polling_jedec(chipaddr dst, uint8_t data);
-void start_program_jedec(chipaddr bios);
int write_byte_program_jedec(chipaddr bios, uint8_t *src,
chipaddr dst);
int probe_jedec(struct flashchip *flash);
int erase_chip_jedec(struct flashchip *flash);
int write_jedec(struct flashchip *flash, uint8_t *buf);
int write_jedec_1(struct flashchip *flash, uint8_t *buf);
int erase_sector_jedec(struct flashchip *flash, unsigned int page, unsigned
int pagesize);
int erase_block_jedec(struct flashchip *flash, unsigned int page, unsigned int
blocksize);
int erase_chip_block_jedec(struct flashchip *flash, unsigned int page,
unsigned int blocksize);
-int write_sector_jedec(chipaddr bios, uint8_t *src,
- chipaddr dst, unsigned int page_size);
+int write_sector_jedec_common(struct flashchip *flash, uint8_t *src, chipaddr
dst, unsigned int page_size, unsigned int mask);
/* m29f002.c */
int erase_m29f002(struct flashchip *flash);
int write_m29f002t(struct flashchip *flash, uint8_t *buf);
int write_m29f002b(struct flashchip *flash, uint8_t *buf);
/* m29f400bt.c */
diff --git a/flash.h b/flash.h
index feac98e..4d1d6b6 100644
--- a/flash.h
+++ b/flash.h
@@ -140,14 +140,17 @@ enum chipbustype {
#define NUM_ERASEREGIONS 5
/*
* How many different erase functions do we have per chip?
*/
#define NUM_ERASEFUNCTIONS 5
+#define FEATURE_REGISTERMAP (1 << 0)
+#define FEATURE_BYTEWRITES (1 << 1)
+
struct flashchip {
const char *vendor;
const char *name;
enum chipbustype bustype;
/*
@@ -156,14 +159,15 @@ struct flashchip {
* Identification code.
*/
uint32_t manufacture_id;
uint32_t model_id;
int total_size;
int page_size;
+ int feature_bits;
/*
* Indicate if flashrom has been tested with this flash chip and if
* everything worked correctly.
*/
uint32_t tested;
diff --git a/flashchips.c b/flashchips.c
index 59f9139..50a1226 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -1,14 +1,15 @@
/*
* This file is part of the flashrom project.
*
* Copyright (C) 2000 Silicon Integrated System Corporation
* Copyright (C) 2004 Tyan Corp
* Copyright (C) 2005-2008 coresystems GmbH <[email protected]>
* Copyright (C) 2006-2009 Carl-Daniel Hailfinger
+ * Copyright (C) 2009 Sean Nelson <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
diff --git a/jedec.c b/jedec.c
index d6cad41..e1bd12f 100644
--- a/jedec.c
+++ b/jedec.c
@@ -1,14 +1,15 @@
/*
* This file is part of the flashrom project.
*
* Copyright (C) 2000 Silicon Integrated System Corporation
* Copyright (C) 2006 Giampiero Giancipoli <[email protected]>
* Copyright (C) 2006 coresystems GmbH <[email protected]>
* Copyright (C) 2007 Carl-Daniel Hailfinger
+ * Copyright (C) 2009 Sean Nelson <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
@@ -20,14 +21,16 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "flash.h"
#define MAX_REFLASH_TRIES 0x10
+#define MASK_FULL 0xffff
+#define MASK_2AA 0x7ff
/* Check one byte for odd parity */
uint8_t oddparity(uint8_t val)
{
val = (val ^ (val >> 4)) & 0xf;
val = (val ^ (val >> 2)) & 0x3;
return (val ^ (val >> 1)) & 0x1;
@@ -83,22 +86,24 @@ void data_polling_jedec(chipaddr dst, uint8_t data)
break;
}
}
if (i > 0x100000)
printf_debug("%s: excessive loops, i=0x%x\n", __func__, i);
}
-void start_program_jedec(chipaddr bios)
+void start_program_jedec_common(struct flashchip *flash, unsigned int mask)
{
- chip_writeb(0xAA, bios + 0x5555);
- chip_writeb(0x55, bios + 0x2AAA);
- chip_writeb(0xA0, bios + 0x5555);
+ chipaddr bios = flash->virtual_memory;
+ chip_writeb(0xAA, bios + (0x5555 & mask));
+ chip_writeb(0x55, bios + (0x2AAA & mask));
+ chip_writeb(0xA0, bios + (0x5555 & mask));
}
-int probe_jedec(struct flashchip *flash)
+int probe_jedec_common(struct flashchip *flash,
+ unsigned int mask, int long_reset)
{
chipaddr bios = flash->virtual_memory;
uint8_t id1, id2;
uint32_t largeid1, largeid2;
uint32_t flashcontent1, flashcontent2;
int probe_timing_enter, probe_timing_exit;
@@ -114,21 +119,21 @@ int probe_jedec(struct flashchip *flash)
} else {
printf("Chip has negative value in probe_timing, failing "
"without chip access\n");
return 0;
}
/* Issue JEDEC Product ID Entry command */
- chip_writeb(0xAA, bios + 0x5555);
+ chip_writeb(0xAA, bios + (0x5555 & mask));
if (probe_timing_enter)
programmer_delay(10);
- chip_writeb(0x55, bios + 0x2AAA);
+ chip_writeb(0x55, bios + (0x2AAA & mask));
if (probe_timing_enter)
programmer_delay(10);
- chip_writeb(0x90, bios + 0x5555);
+ chip_writeb(0x90, bios + (0x5555 & mask));
if (probe_timing_enter)
programmer_delay(probe_timing_enter);
/* Read product ID */
id1 = chip_readb(bios);
id2 = chip_readb(bios + 0x01);
largeid1 = id1;
@@ -143,21 +148,24 @@ int probe_jedec(struct flashchip *flash)
if (id2 == 0x7F) {
largeid2 <<= 8;
id2 = chip_readb(bios + 0x101);
largeid2 |= id2;
}
/* Issue JEDEC Product ID Exit command */
- chip_writeb(0xAA, bios + 0x5555);
- if (probe_timing_exit)
- programmer_delay(10);
- chip_writeb(0x55, bios + 0x2AAA);
- if (probe_timing_exit)
- programmer_delay(10);
- chip_writeb(0xF0, bios + 0x5555);
+ if (long_reset)
+ {
+ chip_writeb(0xAA, bios + (0x5555 & mask));
+ if (probe_timing_exit)
+ programmer_delay(10);
+ chip_writeb(0x55, bios + (0x2AAA & mask));
+ if (probe_timing_exit)
+ programmer_delay(10);
+ }
+ chip_writeb(0xF0, bios + (0x5555 & mask));
if (probe_timing_exit)
programmer_delay(probe_timing_exit);
printf_debug("%s: id1 0x%02x, id2 0x%02x", __func__, largeid1,
largeid2);
if (!oddparity(id1))
printf_debug(", id1 parity violation");
@@ -180,167 +188,123 @@ int probe_jedec(struct flashchip *flash)
if (largeid2 == flashcontent2)
printf_debug(", id2 is normal flash content");
printf_debug("\n");
if (largeid1 == flash->manufacture_id && largeid2 == flash->model_id)
return 1;
+ if (flash->feature_bits & FEATURE_REGISTERMAP)
+ map_flash_registers(flash);
+
return 0;
}
-int erase_sector_jedec(struct flashchip *flash, unsigned int page, unsigned
int pagesize)
+int erase_sector_jedec_common(struct flashchip *flash, unsigned int page,
+ unsigned int pagesize, unsigned int mask)
{
chipaddr bios = flash->virtual_memory;
/* Issue the Sector Erase command */
- chip_writeb(0xAA, bios + 0x5555);
+ chip_writeb(0xAA, bios + (0x5555 & mask));
programmer_delay(10);
- chip_writeb(0x55, bios + 0x2AAA);
+ chip_writeb(0x55, bios + (0x2AAA & mask));
programmer_delay(10);
- chip_writeb(0x80, bios + 0x5555);
+ chip_writeb(0x80, bios + (0x5555 & mask));
programmer_delay(10);
- chip_writeb(0xAA, bios + 0x5555);
+ chip_writeb(0xAA, bios + (0x5555 & mask));
programmer_delay(10);
- chip_writeb(0x55, bios + 0x2AAA);
+ chip_writeb(0x55, bios + (0x2AAA & mask));
programmer_delay(10);
chip_writeb(0x30, bios + page);
programmer_delay(10);
/* wait for Toggle bit ready */
toggle_ready_jedec_slow(bios);
if (check_erased_range(flash, page, pagesize)) {
fprintf(stderr,"ERASE FAILED!\n");
return -1;
}
return 0;
}
-int erase_block_jedec(struct flashchip *flash, unsigned int block, unsigned
int blocksize)
+int erase_block_jedec_common(struct flashchip *flash, unsigned int block,
+ unsigned int blocksize, unsigned int mask)
{
chipaddr bios = flash->virtual_memory;
/* Issue the Sector Erase command */
- chip_writeb(0xAA, bios + 0x5555);
+ chip_writeb(0xAA, bios + (0x5555 & mask));
programmer_delay(10);
- chip_writeb(0x55, bios + 0x2AAA);
+ chip_writeb(0x55, bios + (0x2AAA & mask));
programmer_delay(10);
- chip_writeb(0x80, bios + 0x5555);
+ chip_writeb(0x80, bios + (0x5555 & mask));
programmer_delay(10);
- chip_writeb(0xAA, bios + 0x5555);
+ chip_writeb(0xAA, bios + (0x5555 & mask));
programmer_delay(10);
- chip_writeb(0x55, bios + 0x2AAA);
+ chip_writeb(0x55, bios + (0x2AAA & mask));
programmer_delay(10);
chip_writeb(0x50, bios + block);
programmer_delay(10);
/* wait for Toggle bit ready */
toggle_ready_jedec_slow(bios);
if (check_erased_range(flash, block, blocksize)) {
fprintf(stderr,"ERASE FAILED!\n");
return -1;
}
return 0;
}
-/* erase chip with block_erase() prototype */
-int erase_chip_block_jedec(struct flashchip *flash, unsigned int addr,
unsigned int blocksize)
-{
- if ((addr != 0) || (blocksize != flash->total_size * 1024)) {
- fprintf(stderr, "%s called with incorrect arguments\n",
- __func__);
- return -1;
- }
- return erase_chip_jedec(flash);
-}
-
-int erase_chip_jedec(struct flashchip *flash)
+int erase_chip_jedec_common(struct flashchip *flash, unsigned int mask)
{
int total_size = flash->total_size * 1024;
chipaddr bios = flash->virtual_memory;
/* Issue the JEDEC Chip Erase command */
- chip_writeb(0xAA, bios + 0x5555);
+ chip_writeb(0xAA, bios + (0x5555 & mask));
programmer_delay(10);
- chip_writeb(0x55, bios + 0x2AAA);
+ chip_writeb(0x55, bios + (0x2AAA & mask));
programmer_delay(10);
- chip_writeb(0x80, bios + 0x5555);
+ chip_writeb(0x80, bios + (0x5555 & mask));
programmer_delay(10);
- chip_writeb(0xAA, bios + 0x5555);
+ chip_writeb(0xAA, bios + (0x5555 & mask));
programmer_delay(10);
- chip_writeb(0x55, bios + 0x2AAA);
+ chip_writeb(0x55, bios + (0x2AAA & mask));
programmer_delay(10);
- chip_writeb(0x10, bios + 0x5555);
+ chip_writeb(0x10, bios + (0x5555 & mask));
programmer_delay(10);
toggle_ready_jedec_slow(bios);
if (check_erased_range(flash, 0, total_size)) {
fprintf(stderr,"ERASE FAILED!\n");
return -1;
}
return 0;
}
-int write_page_write_jedec(struct flashchip *flash, uint8_t *src,
- int start, int page_size)
-{
- int i, tried = 0, failed;
- uint8_t *s = src;
- chipaddr bios = flash->virtual_memory;
- chipaddr dst = bios + start;
- chipaddr d = dst;
-
-retry:
- /* Issue JEDEC Data Unprotect comand */
- start_program_jedec(bios);
-
- /* transfer data from source to destination */
- for (i = 0; i < page_size; i++) {
- /* If the data is 0xFF, don't program it */
- if (*src != 0xFF)
- chip_writeb(*src, dst);
- dst++;
- src++;
- }
-
- toggle_ready_jedec(dst - 1);
-
- dst = d;
- src = s;
- failed = verify_range(flash, src, start, page_size, NULL);
-
- if (failed && tried++ < MAX_REFLASH_TRIES) {
- fprintf(stderr, "retrying.\n");
- goto retry;
- }
- if (failed) {
- fprintf(stderr, " page 0x%lx failed!\n",
- (d - bios) / page_size);
- }
- return failed;
-}
-
-int write_byte_program_jedec(chipaddr bios, uint8_t *src,
- chipaddr dst)
+int write_byte_program_jedec_common(struct flashchip *flash, uint8_t *src,
+ chipaddr dst, unsigned int mask)
{
int tried = 0, failed = 0;
+ chipaddr bios = flash->virtual_memory;
/* If the data is 0xFF, don't program it and don't complain. */
if (*src == 0xFF) {
return 0;
}
retry:
/* Issue JEDEC Byte Program command */
- start_program_jedec(bios);
+ start_program_jedec_common(flash, mask);
/* transfer data from source to destination */
chip_writeb(*src, dst);
toggle_ready_jedec(bios);
if (chip_readb(dst) != *src && tried++ < MAX_REFLASH_TRIES) {
goto retry;
@@ -348,48 +312,87 @@ retry:
if (tried >= MAX_REFLASH_TRIES)
failed = 1;
return failed;
}
-int write_sector_jedec(chipaddr bios, uint8_t *src,
- chipaddr dst, unsigned int page_size)
+int write_sector_jedec_common(struct flashchip *flash, uint8_t *src,
+ chipaddr dst, unsigned int page_size, unsigned int mask)
{
int i, failed = 0;
chipaddr olddst;
olddst = dst;
for (i = 0; i < page_size; i++) {
- if (write_byte_program_jedec(bios, src, dst))
+ if (write_byte_program_jedec_common(flash, src, dst, mask))
failed = 1;
dst++, src++;
}
if (failed)
fprintf(stderr, " writing sector at 0x%lx failed!\n", olddst);
return failed;
}
+int write_page_write_jedec_common(struct flashchip *flash, uint8_t *src,
+ int start, int page_size, unsigned int mask)
+{
+ int i, tried = 0, failed;
+ uint8_t *s = src;
+ chipaddr bios = flash->virtual_memory;
+ chipaddr dst = bios + start;
+ chipaddr d = dst;
+
+retry:
+ /* Issue JEDEC Start Program comand */
+ start_program_jedec_common(flash, mask);
+
+ /* transfer data from source to destination */
+ for (i = 0; i < page_size; i++) {
+ /* If the data is 0xFF, don't program it */
+ if (*src != 0xFF)
+ chip_writeb(*src, dst);
+ dst++;
+ src++;
+ }
+
+ toggle_ready_jedec(dst - 1);
+
+ dst = d;
+ src = s;
+ failed = verify_range(flash, src, start, page_size, NULL);
+
+ if (failed && tried++ < MAX_REFLASH_TRIES) {
+ fprintf(stderr, "retrying.\n");
+ goto retry;
+ }
+ if (failed) {
+ fprintf(stderr, " page 0x%lx failed!\n",
+ (d - bios) / page_size);
+ }
+ return failed;
+}
+
int write_jedec(struct flashchip *flash, uint8_t *buf)
{
int i, failed = 0;
int total_size = flash->total_size * 1024;
int page_size = flash->page_size;
if (erase_chip_jedec(flash)) {
fprintf(stderr,"ERASE FAILED!\n");
return -1;
}
printf("Programming page: ");
for (i = 0; i < total_size / page_size; i++) {
printf("%04d at address: 0x%08x", i, i * page_size);
- if (write_page_write_jedec(flash, buf + i * page_size,
- i * page_size, page_size))
+ if (write_page_write_jedec_common(flash, buf + i * page_size,
+ i * page_size, page_size, MASK_FULL))
failed = 1;
printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
}
printf("\n");
return failed;
}
@@ -407,16 +410,48 @@ int write_jedec_1(struct flashchip *flash, uint8_t * buf)
}
printf("Programming page: ");
for (i = 0; i < flash->total_size; i++) {
if ((i & 0x3) == 0)
printf("address: 0x%08lx", (unsigned long)i * 1024);
- write_sector_jedec(bios, buf + i * 1024, dst + i * 1024, 1024);
+ write_sector_jedec_common(flash, buf + i * 1024, dst + i *
1024, 1024, MASK_FULL);
if ((i & 0x3) == 0)
printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
}
printf("\n");
return 0;
}
+
+/* erase chip with block_erase() prototype */
+int erase_chip_block_jedec(struct flashchip *flash, unsigned int addr,
+ unsigned int blocksize)
+{
+ if ((addr != 0) || (blocksize != flash->total_size * 1024)) {
+ fprintf(stderr, "%s called with incorrect arguments\n",
+ __func__);
+ return -1;
+ }
+ return erase_chip_jedec_common(flash, MASK_FULL);
+}
+
+int probe_jedec(struct flashchip *flash)
+{
+ return probe_jedec_common(flash, MASK_FULL, 1);
+}
+
+int erase_sector_jedec(struct flashchip *flash, unsigned int page, unsigned
int size)
+{
+ return erase_sector_jedec_common(flash, page, size, MASK_FULL);
+}
+
+int erase_block_jedec(struct flashchip *flash, unsigned int page, unsigned int
size)
+{
+ return erase_block_jedec_common(flash, page, size, MASK_FULL);
+}
+
+int erase_chip_jedec(struct flashchip *flash)
+{
+ return erase_chip_jedec_common(flash, MASK_FULL);
+}
diff --git a/pm49fl00x.c b/pm49fl00x.c
index 27a1163..424b0ed 100644
--- a/pm49fl00x.c
+++ b/pm49fl00x.c
@@ -97,16 +97,16 @@ int write_49fl00x(struct flashchip *flash, uint8_t *buf)
if (erase_block_jedec(flash, i * page_size, page_size)) {
fprintf(stderr, "ERASE FAILED!\n");
return -1;
}
/* write to the sector */
printf("%04d at address: 0x%08x", i, i * page_size);
- write_sector_jedec(bios, buf + i * page_size,
- bios + i * page_size, page_size);
+ write_sector_jedec_common(flash, buf + i * page_size,
+ bios + i * page_size, page_size, 0xffff);
printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
fflush(stdout);
}
printf("\n");
/* protected */
write_lockbits_49fl00x(flash->virtual_registers, total_size, 1,
diff --git a/sst49lf040.c b/sst49lf040.c
index ab1c918..c91a139 100644
--- a/sst49lf040.c
+++ b/sst49lf040.c
@@ -55,16 +55,16 @@ int write_49lf040(struct flashchip *flash, uint8_t *buf)
return -1;
}
/* write to the sector */
if (i % 10 == 0)
printf("%04d at address: 0x%08x ", i, i * page_size);
- write_sector_jedec(bios, buf + i * page_size,
- bios + i * page_size, page_size);
+ write_sector_jedec_common(flash, buf + i * page_size,
+ bios + i * page_size, page_size, 0xffff);
if (i % 10 == 0)
printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
fflush(stdout);
}
printf("\n");
diff --git a/sst_fwhub.c b/sst_fwhub.c
index f09aa54..4a976e6 100644
--- a/sst_fwhub.c
+++ b/sst_fwhub.c
@@ -153,16 +153,16 @@ int write_sst_fwhub(struct flashchip *flash, uint8_t *buf)
flash->read(flash, readbuf, i * page_size, page_size);
if (memcmp((void *)(buf + i * page_size),
(void *)(readbuf), page_size)) {
rc = erase_sst_fwhub_block(flash, i * page_size,
page_size);
if (rc)
return 1;
- write_sector_jedec(bios, buf + i * page_size,
- bios + i * page_size, page_size);
+ write_sector_jedec_common(flash, buf + i * page_size,
+ bios + i * page_size, page_size,
0xffff);
}
printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
}
printf("\n");
return 0;
}
diff --git a/w39v040c.c b/w39v040c.c
index 722ae29..66ab115 100644
--- a/w39v040c.c
+++ b/w39v040c.c
@@ -76,15 +76,15 @@ int write_w39v040c(struct flashchip *flash, uint8_t *buf)
fprintf(stderr, "ERASE FAILED!\n");
return -1;
}
printf("Programming page: ");
for (i = 0; i < total_size / page_size; i++) {
printf("%04d at address: 0x%08x", i, i * page_size);
- write_sector_jedec(bios, buf + i * page_size,
- bios + i * page_size, page_size);
+ write_sector_jedec_common(flash, buf + i * page_size,
+ bios + i * page_size, page_size, 0xffff);
printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
}
printf("\n");
return 0;
}
diff --git a/w39v080fa.c b/w39v080fa.c
index 580657f..311e55b 100644
--- a/w39v080fa.c
+++ b/w39v080fa.c
@@ -178,13 +178,13 @@ int write_winbond_fwhub(struct flashchip *flash, uint8_t
*buf)
if (erase_winbond_fwhub(flash))
return -1;
printf("Programming: ");
for (i = 0; i < total_size; i += flash->page_size) {
printf("0x%08x\b\b\b\b\b\b\b\b\b\b", i);
- write_sector_jedec(bios, buf + i, bios + i, flash->page_size);
+ write_sector_jedec_common(flash, buf + i, bios + i,
flash->page_size, 0xffff);
}
printf("\n");
return 0;
}
diff --git a/w49f002u.c b/w49f002u.c
index d12bc72..87ce000 100644
--- a/w49f002u.c
+++ b/w49f002u.c
@@ -32,16 +32,16 @@ int write_49f002(struct flashchip *flash, uint8_t *buf)
return -1;
}
printf("Programming page: ");
for (i = 0; i < total_size / page_size; i++) {
printf("%04d at address: 0x%08x ", i, i * page_size);
/* Byte-wise writing of 'page_size' bytes. */
- write_sector_jedec(bios, buf + i * page_size,
- bios + i * page_size, page_size);
+ write_sector_jedec_common(flash, buf + i * page_size,
+ bios + i * page_size, page_size, 0xffff);
printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
fflush(stdout);
}
printf("\n");
return 0;
}
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