2012-10-09 17:54:32 +08:00
|
|
|
config METAG
|
|
|
|
|
def_bool y
|
|
|
|
|
select EMBEDDED
|
|
|
|
|
select GENERIC_ATOMIC64
|
|
|
|
|
select GENERIC_CLOCKEVENTS
|
|
|
|
|
select GENERIC_IRQ_SHOW
|
|
|
|
|
select GENERIC_SMP_IDLE_THREAD
|
|
|
|
|
select HAVE_64BIT_ALIGNED_ACCESS
|
|
|
|
|
select HAVE_ARCH_TRACEHOOK
|
2012-10-05 23:27:31 +08:00
|
|
|
select HAVE_C_RECORDMCOUNT
|
2012-10-09 17:54:32 +08:00
|
|
|
select HAVE_DEBUG_KMEMLEAK
|
2014-01-16 16:39:24 +08:00
|
|
|
select HAVE_DEBUG_STACKOVERFLOW
|
2012-10-05 23:27:31 +08:00
|
|
|
select HAVE_DYNAMIC_FTRACE
|
2016-05-21 08:00:16 +08:00
|
|
|
select HAVE_EXIT_THREAD
|
2012-10-05 23:27:31 +08:00
|
|
|
select HAVE_FTRACE_MCOUNT_RECORD
|
|
|
|
|
select HAVE_FUNCTION_TRACER
|
2012-10-09 17:54:32 +08:00
|
|
|
select HAVE_KERNEL_BZIP2
|
|
|
|
|
select HAVE_KERNEL_GZIP
|
|
|
|
|
select HAVE_KERNEL_LZO
|
|
|
|
|
select HAVE_KERNEL_XZ
|
|
|
|
|
select HAVE_MEMBLOCK
|
|
|
|
|
select HAVE_MEMBLOCK_NODE_MAP
|
|
|
|
|
select HAVE_MOD_ARCH_SPECIFIC
|
2013-03-15 18:21:56 +08:00
|
|
|
select HAVE_OPROFILE
|
2012-10-05 23:54:55 +08:00
|
|
|
select HAVE_PERF_EVENTS
|
2012-10-09 17:54:32 +08:00
|
|
|
select HAVE_SYSCALL_TRACEPOINTS
|
2013-03-15 12:34:17 +08:00
|
|
|
select HAVE_UNDERSCORE_SYMBOL_PREFIX
|
2012-10-09 17:54:32 +08:00
|
|
|
select IRQ_DOMAIN
|
|
|
|
|
select MODULES_USE_ELF_RELA
|
|
|
|
|
select OF
|
|
|
|
|
select OF_EARLY_FLATTREE
|
|
|
|
|
select SPARSE_IRQ
|
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
|
|
|
select CPU_NO_EFFICIENT_FFS
|
2012-10-09 17:54:32 +08:00
|
|
|
|
|
|
|
|
config STACKTRACE_SUPPORT
|
|
|
|
|
def_bool y
|
|
|
|
|
|
|
|
|
|
config LOCKDEP_SUPPORT
|
|
|
|
|
def_bool y
|
|
|
|
|
|
|
|
|
|
config RWSEM_GENERIC_SPINLOCK
|
|
|
|
|
def_bool y
|
|
|
|
|
|
|
|
|
|
config RWSEM_XCHGADD_ALGORITHM
|
|
|
|
|
bool
|
|
|
|
|
|
|
|
|
|
config GENERIC_HWEIGHT
|
|
|
|
|
def_bool y
|
|
|
|
|
|
|
|
|
|
config GENERIC_CALIBRATE_DELAY
|
|
|
|
|
def_bool y
|
|
|
|
|
|
2014-04-08 06:39:19 +08:00
|
|
|
config NO_IOPORT_MAP
|
2012-10-09 17:54:32 +08:00
|
|
|
def_bool y
|
|
|
|
|
|
|
|
|
|
source "init/Kconfig"
|
|
|
|
|
|
|
|
|
|
source "kernel/Kconfig.freezer"
|
|
|
|
|
|
|
|
|
|
menu "Processor type and features"
|
|
|
|
|
|
|
|
|
|
config MMU
|
|
|
|
|
def_bool y
|
|
|
|
|
|
|
|
|
|
config STACK_GROWSUP
|
|
|
|
|
def_bool y
|
|
|
|
|
|
|
|
|
|
config HOTPLUG_CPU
|
|
|
|
|
bool "Enable CPU hotplug support"
|
|
|
|
|
depends on SMP
|
|
|
|
|
help
|
|
|
|
|
Say Y here to allow turning CPUs off and on. CPUs can be
|
|
|
|
|
controlled through /sys/devices/system/cpu.
|
|
|
|
|
|
|
|
|
|
Say N if you want to disable CPU hotplug.
|
|
|
|
|
|
|
|
|
|
config HIGHMEM
|
|
|
|
|
bool "High Memory Support"
|
|
|
|
|
help
|
|
|
|
|
The address space of Meta processors is only 4 Gigabytes large
|
|
|
|
|
and it has to accommodate user address space, kernel address
|
|
|
|
|
space as well as some memory mapped IO. That means that, if you
|
|
|
|
|
have a large amount of physical memory and/or IO, not all of the
|
|
|
|
|
memory can be "permanently mapped" by the kernel. The physical
|
|
|
|
|
memory that is not permanently mapped is called "high memory".
|
|
|
|
|
|
|
|
|
|
Depending on the selected kernel/user memory split, minimum
|
|
|
|
|
vmalloc space and actual amount of RAM, you may not need this
|
|
|
|
|
option which should result in a slightly faster kernel.
|
|
|
|
|
|
|
|
|
|
If unsure, say n.
|
|
|
|
|
|
|
|
|
|
source "arch/metag/mm/Kconfig"
|
|
|
|
|
|
|
|
|
|
source "arch/metag/Kconfig.soc"
|
|
|
|
|
|
|
|
|
|
config METAG_META12
|
|
|
|
|
bool
|
|
|
|
|
help
|
|
|
|
|
Select this from the SoC config symbol to indicate that it contains a
|
|
|
|
|
Meta 1.2 core.
|
|
|
|
|
|
|
|
|
|
config METAG_META21
|
|
|
|
|
bool
|
|
|
|
|
help
|
|
|
|
|
Select this from the SoC config symbol to indicate that it contains a
|
|
|
|
|
Meta 2.1 core.
|
|
|
|
|
|
|
|
|
|
config SMP
|
|
|
|
|
bool "Symmetric multi-processing support"
|
|
|
|
|
depends on METAG_META21 && METAG_META21_MMU
|
|
|
|
|
help
|
|
|
|
|
This enables support for systems with more than one thread running
|
|
|
|
|
Linux. If you have a system with only one thread running Linux,
|
|
|
|
|
say N. Otherwise, say Y.
|
|
|
|
|
|
|
|
|
|
config NR_CPUS
|
|
|
|
|
int "Maximum number of CPUs (2-4)" if SMP
|
|
|
|
|
range 2 4 if SMP
|
|
|
|
|
default "1" if !SMP
|
|
|
|
|
default "4" if SMP
|
|
|
|
|
|
|
|
|
|
config METAG_SMP_WRITE_REORDERING
|
|
|
|
|
bool
|
|
|
|
|
help
|
|
|
|
|
This attempts to prevent cache-memory incoherence due to external
|
|
|
|
|
reordering of writes from different hardware threads when SMP is
|
|
|
|
|
enabled. It adds fences (system event 0) to smp_mb and smp_rmb in an
|
|
|
|
|
attempt to catch some of the cases, and also before writes to shared
|
|
|
|
|
memory in LOCK1 protected atomics and spinlocks.
|
|
|
|
|
This will not completely prevent cache incoherency on affected cores.
|
|
|
|
|
|
|
|
|
|
config METAG_LNKGET_AROUND_CACHE
|
|
|
|
|
bool
|
|
|
|
|
depends on METAG_META21
|
|
|
|
|
help
|
|
|
|
|
This indicates that the LNKGET/LNKSET instructions go around the
|
|
|
|
|
cache, which requires some extra cache flushes when the memory needs
|
|
|
|
|
to be accessed by normal GET/SET instructions too.
|
|
|
|
|
|
|
|
|
|
choice
|
|
|
|
|
prompt "Atomicity primitive"
|
|
|
|
|
default METAG_ATOMICITY_LNKGET
|
|
|
|
|
help
|
|
|
|
|
This option selects the mechanism for performing atomic operations.
|
|
|
|
|
|
|
|
|
|
config METAG_ATOMICITY_IRQSOFF
|
|
|
|
|
depends on !SMP
|
|
|
|
|
bool "irqsoff"
|
|
|
|
|
help
|
|
|
|
|
This option disables interrupts to achieve atomicity. This mechanism
|
|
|
|
|
is not SMP-safe.
|
|
|
|
|
|
|
|
|
|
config METAG_ATOMICITY_LNKGET
|
|
|
|
|
depends on METAG_META21
|
|
|
|
|
bool "lnkget/lnkset"
|
|
|
|
|
help
|
|
|
|
|
This option uses the LNKGET and LNKSET instructions to achieve
|
|
|
|
|
atomicity. LNKGET/LNKSET are load-link/store-conditional instructions.
|
|
|
|
|
Choose this option if your system requires low latency.
|
|
|
|
|
|
|
|
|
|
config METAG_ATOMICITY_LOCK1
|
|
|
|
|
depends on SMP
|
|
|
|
|
bool "lock1"
|
|
|
|
|
help
|
|
|
|
|
This option uses the LOCK1 instruction for atomicity. This is mainly
|
|
|
|
|
provided as a debugging aid if the lnkget/lnkset atomicity primitive
|
|
|
|
|
isn't working properly.
|
|
|
|
|
|
|
|
|
|
endchoice
|
|
|
|
|
|
|
|
|
|
config METAG_FPU
|
|
|
|
|
bool "FPU Support"
|
|
|
|
|
depends on METAG_META21
|
|
|
|
|
default y
|
|
|
|
|
help
|
|
|
|
|
This option allows processes to use FPU hardware available with this
|
|
|
|
|
CPU. If this option is not enabled FPU registers will not be saved
|
|
|
|
|
and restored on context-switch.
|
|
|
|
|
|
|
|
|
|
If you plan on running programs which are compiled to use hard floats
|
|
|
|
|
say Y here.
|
|
|
|
|
|
|
|
|
|
config METAG_DSP
|
|
|
|
|
bool "DSP Support"
|
|
|
|
|
help
|
|
|
|
|
This option allows processes to use DSP hardware available
|
|
|
|
|
with this CPU. If this option is not enabled DSP registers
|
|
|
|
|
will not be saved and restored on context-switch.
|
|
|
|
|
|
|
|
|
|
If you plan on running DSP programs say Y here.
|
|
|
|
|
|
|
|
|
|
config METAG_PERFCOUNTER_IRQS
|
|
|
|
|
bool "PerfCounters interrupt support"
|
|
|
|
|
depends on METAG_META21
|
|
|
|
|
help
|
|
|
|
|
This option enables using interrupts to collect information from
|
|
|
|
|
Performance Counters. This option is supported in new META21
|
|
|
|
|
(starting from HTP265).
|
|
|
|
|
|
|
|
|
|
When disabled, Performance Counters information will be collected
|
|
|
|
|
based on Timer Interrupt.
|
|
|
|
|
|
2013-03-15 18:21:56 +08:00
|
|
|
config HW_PERF_EVENTS
|
|
|
|
|
def_bool METAG_PERFCOUNTER_IRQS && PERF_EVENTS
|
|
|
|
|
|
2012-09-22 00:38:15 +08:00
|
|
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config METAG_DA
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bool "DA support"
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help
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Say Y if you plan to use a DA debug adapter with Linux. The presence
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of the DA will be detected automatically at boot, so it is safe to say
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Y to this option even when booting without a DA.
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This enables support for services provided by DA JTAG debug adapters,
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such as:
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- communication over DA channels (such as the console driver).
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- use of the DA filesystem.
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2012-10-09 17:54:32 +08:00
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menu "Boot options"
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config METAG_BUILTIN_DTB
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bool "Embed DTB in kernel image"
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default y
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help
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Embeds a device tree binary in the kernel image.
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config METAG_BUILTIN_DTB_NAME
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string "Built in DTB"
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depends on METAG_BUILTIN_DTB
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help
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Set the name of the DTB to embed (leave blank to pick one
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automatically based on kernel configuration).
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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 "Kernel command line"
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depends on CMDLINE_BOOL
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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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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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endmenu
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source "kernel/Kconfig.preempt"
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source kernel/Kconfig.hz
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endmenu
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menu "Power management options"
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source kernel/power/Kconfig
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endmenu
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menu "Executable file formats"
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source "fs/Kconfig.binfmt"
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endmenu
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source "net/Kconfig"
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source "drivers/Kconfig"
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source "fs/Kconfig"
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source "arch/metag/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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