2019-05-19 20:07:45 +08:00
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# SPDX-License-Identifier: GPL-2.0-only
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2009-03-27 21:25:50 +08:00
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config MICROBLAZE
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def_bool y
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32-bit userspace ABI: introduce ARCH_32BIT_OFF_T config option
All new 32-bit architectures should have 64-bit userspace off_t type, but
existing architectures has 32-bit ones.
To enforce the rule, new config option is added to arch/Kconfig that defaults
ARCH_32BIT_OFF_T to be disabled for new 32-bit architectures. All existing
32-bit architectures enable it explicitly.
New option affects force_o_largefile() behaviour. Namely, if userspace
off_t is 64-bits long, we have no reason to reject user to open big files.
Note that even if architectures has only 64-bit off_t in the kernel
(arc, c6x, h8300, hexagon, nios2, openrisc, and unicore32),
a libc may use 32-bit off_t, and therefore want to limit the file size
to 4GB unless specified differently in the open flags.
Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Yury Norov <ynorov@marvell.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2018-05-16 16:18:49 +08:00
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select ARCH_32BIT_OFF_T
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2018-07-31 19:39:29 +08:00
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select ARCH_NO_SWAP
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2019-06-13 15:08:57 +08:00
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select ARCH_HAS_BINFMT_FLAT if !MMU
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2018-09-11 14:55:28 +08:00
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select ARCH_HAS_DMA_COHERENT_TO_PFN if MMU
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2019-08-14 22:03:47 +08:00
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select ARCH_HAS_DMA_PREP_COHERENT
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2014-12-13 08:57:44 +08:00
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select ARCH_HAS_GCOV_PROFILE_ALL
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2018-07-19 20:54:39 +08:00
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select ARCH_HAS_SYNC_DMA_FOR_CPU
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select ARCH_HAS_SYNC_DMA_FOR_DEVICE
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2019-08-14 22:03:47 +08:00
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select ARCH_HAS_UNCACHED_SEGMENT if !MMU
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2013-10-08 10:12:28 +08:00
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select ARCH_MIGHT_HAVE_PC_PARPORT
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2017-06-28 17:16:57 +08:00
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select ARCH_NO_COHERENT_DMA_MMAP if !MMU
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2012-07-31 05:42:46 +08:00
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select ARCH_WANT_IPC_PARSE_VERSION
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2014-04-07 18:51:44 +08:00
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select BUILDTIME_EXTABLE_SORT
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2017-05-27 01:34:11 +08:00
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select TIMER_OF
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2014-04-07 18:51:44 +08:00
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select CLONE_BACKWARDS3
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select COMMON_CLK
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select GENERIC_ATOMIC64
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select GENERIC_CLOCKEVENTS
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select GENERIC_CPU_DEVICES
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select GENERIC_IDLE_POLL_SETUP
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2011-01-20 03:35:05 +08:00
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select GENERIC_IRQ_PROBE
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2011-03-24 21:55:52 +08:00
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select GENERIC_IRQ_SHOW
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2011-11-25 03:06:41 +08:00
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select GENERIC_PCI_IOMAP
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2013-12-20 17:16:40 +08:00
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select GENERIC_SCHED_CLOCK
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2016-05-25 23:06:09 +08:00
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select HAVE_ARCH_HASH
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2014-04-07 18:51:44 +08:00
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select HAVE_ARCH_KGDB
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select HAVE_DEBUG_KMEMLEAK
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select HAVE_DYNAMIC_FTRACE
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select HAVE_FTRACE_MCOUNT_RECORD
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select HAVE_FUNCTION_GRAPH_TRACER
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select HAVE_FUNCTION_TRACER
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select HAVE_MEMBLOCK_NODE_MAP
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select HAVE_OPROFILE
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2018-11-16 03:05:32 +08:00
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select HAVE_PCI
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2014-04-07 18:51:44 +08:00
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select IRQ_DOMAIN
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2016-11-14 20:13:45 +08:00
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select XILINX_INTC
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2012-09-28 13:01:03 +08:00
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select MODULES_USE_ELF_RELA
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2014-04-07 18:51:44 +08:00
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select OF
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select OF_EARLY_FLATTREE
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2018-11-16 03:05:33 +08:00
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select PCI_DOMAINS_GENERIC if PCI
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2018-11-16 03:05:34 +08:00
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select PCI_SYSCALL if PCI
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2014-04-07 18:51:44 +08:00
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select TRACING_SUPPORT
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select VIRT_TO_BUS
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lib/GCD.c: use binary GCD algorithm instead of Euclidean
The binary GCD algorithm is based on the following facts:
1. If a and b are all evens, then gcd(a,b) = 2 * gcd(a/2, b/2)
2. If a is even and b is odd, then gcd(a,b) = gcd(a/2, b)
3. If a and b are all odds, then gcd(a,b) = gcd((a-b)/2, b) = gcd((a+b)/2, b)
Even on x86 machines with reasonable division hardware, the binary
algorithm runs about 25% faster (80% the execution time) than the
division-based Euclidian algorithm.
On platforms like Alpha and ARMv6 where division is a function call to
emulation code, it's even more significant.
There are two variants of the code here, depending on whether a fast
__ffs (find least significant set bit) instruction is available. This
allows the unpredictable branches in the bit-at-a-time shifting loop to
be eliminated.
If fast __ffs is not available, the "even/odd" GCD variant is used.
I use the following code to benchmark:
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#define swap(a, b) \
do { \
a ^= b; \
b ^= a; \
a ^= b; \
} while (0)
unsigned long gcd0(unsigned long a, unsigned long b)
{
unsigned long r;
if (a < b) {
swap(a, b);
}
if (b == 0)
return a;
while ((r = a % b) != 0) {
a = b;
b = r;
}
return b;
}
unsigned long gcd1(unsigned long a, unsigned long b)
{
unsigned long r = a | b;
if (!a || !b)
return r;
b >>= __builtin_ctzl(b);
for (;;) {
a >>= __builtin_ctzl(a);
if (a == b)
return a << __builtin_ctzl(r);
if (a < b)
swap(a, b);
a -= b;
}
}
unsigned long gcd2(unsigned long a, unsigned long b)
{
unsigned long r = a | b;
if (!a || !b)
return r;
r &= -r;
while (!(b & r))
b >>= 1;
for (;;) {
while (!(a & r))
a >>= 1;
if (a == b)
return a;
if (a < b)
swap(a, b);
a -= b;
a >>= 1;
if (a & r)
a += b;
a >>= 1;
}
}
unsigned long gcd3(unsigned long a, unsigned long b)
{
unsigned long r = a | b;
if (!a || !b)
return r;
b >>= __builtin_ctzl(b);
if (b == 1)
return r & -r;
for (;;) {
a >>= __builtin_ctzl(a);
if (a == 1)
return r & -r;
if (a == b)
return a << __builtin_ctzl(r);
if (a < b)
swap(a, b);
a -= b;
}
}
unsigned long gcd4(unsigned long a, unsigned long b)
{
unsigned long r = a | b;
if (!a || !b)
return r;
r &= -r;
while (!(b & r))
b >>= 1;
if (b == r)
return r;
for (;;) {
while (!(a & r))
a >>= 1;
if (a == r)
return r;
if (a == b)
return a;
if (a < b)
swap(a, b);
a -= b;
a >>= 1;
if (a & r)
a += b;
a >>= 1;
}
}
static unsigned long (*gcd_func[])(unsigned long a, unsigned long b) = {
gcd0, gcd1, gcd2, gcd3, gcd4,
};
#define TEST_ENTRIES (sizeof(gcd_func) / sizeof(gcd_func[0]))
#if defined(__x86_64__)
#define rdtscll(val) do { \
unsigned long __a,__d; \
__asm__ __volatile__("rdtsc" : "=a" (__a), "=d" (__d)); \
(val) = ((unsigned long long)__a) | (((unsigned long long)__d)<<32); \
} while(0)
static unsigned long long benchmark_gcd_func(unsigned long (*gcd)(unsigned long, unsigned long),
unsigned long a, unsigned long b, unsigned long *res)
{
unsigned long long start, end;
unsigned long long ret;
unsigned long gcd_res;
rdtscll(start);
gcd_res = gcd(a, b);
rdtscll(end);
if (end >= start)
ret = end - start;
else
ret = ~0ULL - start + 1 + end;
*res = gcd_res;
return ret;
}
#else
static inline struct timespec read_time(void)
{
struct timespec time;
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &time);
return time;
}
static inline unsigned long long diff_time(struct timespec start, struct timespec end)
{
struct timespec temp;
if ((end.tv_nsec - start.tv_nsec) < 0) {
temp.tv_sec = end.tv_sec - start.tv_sec - 1;
temp.tv_nsec = 1000000000ULL + end.tv_nsec - start.tv_nsec;
} else {
temp.tv_sec = end.tv_sec - start.tv_sec;
temp.tv_nsec = end.tv_nsec - start.tv_nsec;
}
return temp.tv_sec * 1000000000ULL + temp.tv_nsec;
}
static unsigned long long benchmark_gcd_func(unsigned long (*gcd)(unsigned long, unsigned long),
unsigned long a, unsigned long b, unsigned long *res)
{
struct timespec start, end;
unsigned long gcd_res;
start = read_time();
gcd_res = gcd(a, b);
end = read_time();
*res = gcd_res;
return diff_time(start, end);
}
#endif
static inline unsigned long get_rand()
{
if (sizeof(long) == 8)
return (unsigned long)rand() << 32 | rand();
else
return rand();
}
int main(int argc, char **argv)
{
unsigned int seed = time(0);
int loops = 100;
int repeats = 1000;
unsigned long (*res)[TEST_ENTRIES];
unsigned long long elapsed[TEST_ENTRIES];
int i, j, k;
for (;;) {
int opt = getopt(argc, argv, "n:r:s:");
/* End condition always first */
if (opt == -1)
break;
switch (opt) {
case 'n':
loops = atoi(optarg);
break;
case 'r':
repeats = atoi(optarg);
break;
case 's':
seed = strtoul(optarg, NULL, 10);
break;
default:
/* You won't actually get here. */
break;
}
}
res = malloc(sizeof(unsigned long) * TEST_ENTRIES * loops);
memset(elapsed, 0, sizeof(elapsed));
srand(seed);
for (j = 0; j < loops; j++) {
unsigned long a = get_rand();
/* Do we have args? */
unsigned long b = argc > optind ? strtoul(argv[optind], NULL, 10) : get_rand();
unsigned long long min_elapsed[TEST_ENTRIES];
for (k = 0; k < repeats; k++) {
for (i = 0; i < TEST_ENTRIES; i++) {
unsigned long long tmp = benchmark_gcd_func(gcd_func[i], a, b, &res[j][i]);
if (k == 0 || min_elapsed[i] > tmp)
min_elapsed[i] = tmp;
}
}
for (i = 0; i < TEST_ENTRIES; i++)
elapsed[i] += min_elapsed[i];
}
for (i = 0; i < TEST_ENTRIES; i++)
printf("gcd%d: elapsed %llu\n", i, elapsed[i]);
k = 0;
srand(seed);
for (j = 0; j < loops; j++) {
unsigned long a = get_rand();
unsigned long b = argc > optind ? strtoul(argv[optind], NULL, 10) : get_rand();
for (i = 1; i < TEST_ENTRIES; i++) {
if (res[j][i] != res[j][0])
break;
}
if (i < TEST_ENTRIES) {
if (k == 0) {
k = 1;
fprintf(stderr, "Error:\n");
}
fprintf(stderr, "gcd(%lu, %lu): ", a, b);
for (i = 0; i < TEST_ENTRIES; i++)
fprintf(stderr, "%ld%s", res[j][i], i < TEST_ENTRIES - 1 ? ", " : "\n");
}
}
if (k == 0)
fprintf(stderr, "PASS\n");
free(res);
return 0;
}
Compiled with "-O2", on "VirtualBox 4.4.0-22-generic #38-Ubuntu x86_64" got:
zhaoxiuzeng@zhaoxiuzeng-VirtualBox:~/develop$ ./gcd -r 500000 -n 10
gcd0: elapsed 10174
gcd1: elapsed 2120
gcd2: elapsed 2902
gcd3: elapsed 2039
gcd4: elapsed 2812
PASS
zhaoxiuzeng@zhaoxiuzeng-VirtualBox:~/develop$ ./gcd -r 500000 -n 10
gcd0: elapsed 9309
gcd1: elapsed 2280
gcd2: elapsed 2822
gcd3: elapsed 2217
gcd4: elapsed 2710
PASS
zhaoxiuzeng@zhaoxiuzeng-VirtualBox:~/develop$ ./gcd -r 500000 -n 10
gcd0: elapsed 9589
gcd1: elapsed 2098
gcd2: elapsed 2815
gcd3: elapsed 2030
gcd4: elapsed 2718
PASS
zhaoxiuzeng@zhaoxiuzeng-VirtualBox:~/develop$ ./gcd -r 500000 -n 10
gcd0: elapsed 9914
gcd1: elapsed 2309
gcd2: elapsed 2779
gcd3: elapsed 2228
gcd4: elapsed 2709
PASS
[akpm@linux-foundation.org: avoid #defining a CONFIG_ variable]
Signed-off-by: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com>
Signed-off-by: George Spelvin <linux@horizon.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-21 08:03:57 +08:00
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select CPU_NO_EFFICIENT_FFS
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2018-09-04 23:04:07 +08:00
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select MMU_GATHER_NO_RANGE if MMU
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2009-03-27 21:25:50 +08:00
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2017-09-09 07:14:25 +08:00
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# Endianness selection
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choice
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prompt "Endianness selection"
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2017-09-19 00:53:29 +08:00
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default CPU_LITTLE_ENDIAN
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2017-09-09 07:14:25 +08:00
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help
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microblaze architectures can be configured for either little or
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big endian formats. Be sure to select the appropriate mode.
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config CPU_BIG_ENDIAN
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bool "Big endian"
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config CPU_LITTLE_ENDIAN
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bool "Little endian"
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endchoice
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2011-12-15 16:24:06 +08:00
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config ZONE_DMA
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def_bool y
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2009-03-27 21:25:50 +08:00
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config ARCH_HAS_ILOG2_U32
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def_bool n
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config ARCH_HAS_ILOG2_U64
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def_bool n
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config GENERIC_HWEIGHT
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def_bool y
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config GENERIC_CALIBRATE_DELAY
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def_bool y
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2009-06-19 01:55:32 +08:00
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config GENERIC_CSUM
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def_bool y
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2009-11-10 22:57:01 +08:00
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config STACKTRACE_SUPPORT
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def_bool y
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2009-12-10 19:07:02 +08:00
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config LOCKDEP_SUPPORT
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def_bool y
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2014-04-07 19:05:00 +08:00
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source "arch/microblaze/Kconfig.platform"
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2009-03-27 21:25:50 +08:00
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menu "Processor type and features"
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source "kernel/Kconfig.hz"
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config MMU
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2009-05-26 22:30:31 +08:00
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bool "MMU support"
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default n
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2009-03-27 21:25:50 +08:00
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comment "Boot options"
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config CMDLINE_BOOL
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bool "Default bootloader kernel arguments"
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config CMDLINE
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string "Default kernel command string"
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depends on CMDLINE_BOOL
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default "console=ttyUL0,115200"
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help
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On some architectures there is currently no way for the boot loader
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to pass arguments to the kernel. For these architectures, you should
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supply some command-line options at build time by entering them
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here.
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config CMDLINE_FORCE
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bool "Force default kernel command string"
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depends on CMDLINE_BOOL
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default n
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help
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Set this to have arguments from the default kernel command string
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override those passed by the boot loader.
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2010-08-06 14:50:35 +08:00
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config SECCOMP
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bool "Enable seccomp to safely compute untrusted bytecode"
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depends on PROC_FS
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default y
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help
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This kernel feature is useful for number crunching applications
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that may need to compute untrusted bytecode during their
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execution. By using pipes or other transports made available to
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the process as file descriptors supporting the read/write
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syscalls, it's possible to isolate those applications in
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their own address space using seccomp. Once seccomp is
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enabled via /proc/<pid>/seccomp, it cannot be disabled
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and the task is only allowed to execute a few safe syscalls
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defined by each seccomp mode.
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If unsure, say Y. Only embedded should say N here.
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2009-03-27 21:25:50 +08:00
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endmenu
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2014-09-01 22:23:54 +08:00
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menu "Kernel features"
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2009-05-26 22:30:31 +08:00
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2014-10-27 15:28:16 +08:00
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config NR_CPUS
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int
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default "1"
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2009-05-26 22:30:31 +08:00
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config ADVANCED_OPTIONS
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bool "Prompt for advanced kernel configuration options"
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help
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This option will enable prompting for a variety of advanced kernel
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configuration options. These options can cause the kernel to not
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work if they are set incorrectly, but can be used to optimize certain
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aspects of kernel memory management.
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Unless you know what you are doing, say N here.
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comment "Default settings for advanced configuration options are used"
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depends on !ADVANCED_OPTIONS
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2010-02-22 19:16:08 +08:00
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config XILINX_UNCACHED_SHADOW
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bool "Are you using uncached shadow for RAM ?"
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depends on ADVANCED_OPTIONS && !MMU
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default n
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help
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This is needed to be able to allocate uncachable memory regions.
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The feature requires the design to define the RAM memory controller
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window to be twice as large as the actual physical memory.
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2011-12-15 22:02:37 +08:00
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config HIGHMEM
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bool "High memory support"
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2009-05-26 22:30:31 +08:00
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depends on MMU
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help
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2011-12-15 22:02:37 +08:00
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The address space of Microblaze processors is only 4 Gigabytes large
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and it has to accommodate user address space, kernel address
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space as well as some memory mapped IO. That means that, if you
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have a large amount of physical memory and/or IO, not all of the
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memory can be "permanently mapped" by the kernel. The physical
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memory that is not permanently mapped is called "high memory".
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2009-05-26 22:30:31 +08:00
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2011-12-15 22:02:37 +08:00
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If unsure, say n.
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2009-05-26 22:30:31 +08:00
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config LOWMEM_SIZE_BOOL
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bool "Set maximum low memory"
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2010-02-22 18:33:07 +08:00
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depends on ADVANCED_OPTIONS && MMU
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2009-05-26 22:30:31 +08:00
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help
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This option allows you to set the maximum amount of memory which
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will be used as "low memory", that is, memory which the kernel can
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access directly, without having to set up a kernel virtual mapping.
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This can be useful in optimizing the layout of kernel virtual
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memory.
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Say N here unless you know what you are doing.
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config LOWMEM_SIZE
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hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
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default "0x30000000"
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2010-11-08 19:37:40 +08:00
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config MANUAL_RESET_VECTOR
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hex "Microblaze reset vector address setup"
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default "0x0"
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help
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Set this option to have the kernel override the CPU Reset vector.
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If zero, no change will be made to the MicroBlaze reset vector at
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address 0x0.
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If non-zero, a jump instruction to this address, will be written
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to the reset vector at address 0x0.
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If you are unsure, set it to default value 0x0.
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2009-05-26 22:30:31 +08:00
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config KERNEL_START_BOOL
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bool "Set custom kernel base address"
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depends on ADVANCED_OPTIONS
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help
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This option allows you to set the kernel virtual address at which
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the kernel will map low memory (the kernel image will be linked at
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this address). This can be useful in optimizing the virtual memory
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layout of the system.
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Say N here unless you know what you are doing.
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config KERNEL_START
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hex "Virtual address of kernel base" if KERNEL_START_BOOL
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default "0xc0000000" if MMU
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default KERNEL_BASE_ADDR if !MMU
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config TASK_SIZE_BOOL
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bool "Set custom user task size"
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2010-02-22 18:33:07 +08:00
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depends on ADVANCED_OPTIONS && MMU
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2009-05-26 22:30:31 +08:00
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help
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This option allows you to set the amount of virtual address space
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allocated to user tasks. This can be useful in optimizing the
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virtual memory layout of the system.
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Say N here unless you know what you are doing.
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config TASK_SIZE
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hex "Size of user task space" if TASK_SIZE_BOOL
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default "0x80000000"
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2010-05-13 23:48:27 +08:00
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choice
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prompt "Page size"
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default MICROBLAZE_4K_PAGES
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depends on ADVANCED_OPTIONS && !MMU
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help
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Select the kernel logical page size. Increasing the page size
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will reduce software overhead at each page boundary, allow
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hardware prefetch mechanisms to be more effective, and allow
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larger dma transfers increasing IO efficiency and reducing
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overhead. However the utilization of memory will increase.
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For example, each cached file will using a multiple of the
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page size to hold its contents and the difference between the
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end of file and the end of page is wasted.
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If unsure, choose 4K_PAGES.
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config MICROBLAZE_4K_PAGES
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bool "4k page size"
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config MICROBLAZE_16K_PAGES
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bool "16k page size"
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2012-08-01 16:29:28 +08:00
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config MICROBLAZE_64K_PAGES
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bool "64k page size"
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2010-05-13 23:48:27 +08:00
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endchoice
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2009-03-27 21:25:50 +08:00
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endmenu
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2010-01-18 22:27:10 +08:00
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menu "Bus Options"
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2010-01-18 22:27:11 +08:00
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config PCI_XILINX
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bool "Xilinx PCI host bridge support"
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depends on PCI
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2010-01-18 22:27:10 +08:00
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endmenu
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