mirror of
https://github.com/libretro/RetroArch.git
synced 2024-12-05 06:57:19 +00:00
511 lines
14 KiB
C
511 lines
14 KiB
C
/*
|
|
* Copyright (C) 2010 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/* ChangeLog for this library:
|
|
*
|
|
* NDK r7c: Fix CPU count computation. The old method only reported the
|
|
* number of _active_ CPUs when the library was initialized,
|
|
* which could be less than the real total.
|
|
*
|
|
* NDK r5: Handle buggy kernels which report a CPU Architecture number of 7
|
|
* for an ARMv6 CPU (see below).
|
|
*
|
|
* Handle kernels that only report 'neon', and not 'vfpv3'
|
|
* (VFPv3 is mandated by the ARM architecture is Neon is implemented)
|
|
*
|
|
* Handle kernels that only report 'vfpv3d16', and not 'vfpv3'
|
|
*
|
|
* Fix x86 compilation. Report ANDROID_CPU_FAMILY_X86 in
|
|
* android_getCpuFamily().
|
|
*
|
|
* NDK r4: Initial release
|
|
*/
|
|
#include <sys/system_properties.h>
|
|
#ifdef __arm__
|
|
#include <machine/cpu-features.h>
|
|
#endif
|
|
#include <pthread.h>
|
|
#include "performance_android.h"
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
|
|
static pthread_once_t g_once;
|
|
static AndroidCpuFamily g_cpuFamily;
|
|
static uint64_t g_cpuFeatures;
|
|
static int g_cpuCount;
|
|
|
|
#ifdef __arm__
|
|
# define DEFAULT_CPU_FAMILY ANDROID_CPU_FAMILY_ARM
|
|
#elif defined __i386__
|
|
# define DEFAULT_CPU_FAMILY ANDROID_CPU_FAMILY_X86
|
|
#else
|
|
# define DEFAULT_CPU_FAMILY ANDROID_CPU_FAMILY_UNKNOWN
|
|
#endif
|
|
|
|
#ifdef __i386__
|
|
static __inline__ void cpu_x86_cpuid(int func, int values[4])
|
|
{
|
|
int a, b, c, d;
|
|
/* We need to preserve ebx since we're compiling PIC code */
|
|
/* this means we can't use "=b" for the second output register */
|
|
__asm__ __volatile__ ( \
|
|
"push %%ebx\n"
|
|
"cpuid\n" \
|
|
"mov %1, %%ebx\n"
|
|
"pop %%ebx\n"
|
|
: "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
|
|
: "a" (func) \
|
|
);
|
|
values[0] = a;
|
|
values[1] = b;
|
|
values[2] = c;
|
|
values[3] = d;
|
|
}
|
|
#endif
|
|
|
|
/* Read the content of /proc/cpuinfo into a user-provided buffer.
|
|
* Return the length of the data, or -1 on error. Does *not*
|
|
* zero-terminate the content. Will not read more
|
|
* than 'buffsize' bytes.
|
|
*/
|
|
static int
|
|
cpu_read_file(const char* pathname, char* buffer, size_t buffsize)
|
|
{
|
|
int fd, len;
|
|
|
|
fd = open(pathname, O_RDONLY);
|
|
if (fd < 0)
|
|
return -1;
|
|
|
|
do {
|
|
len = read(fd, buffer, buffsize);
|
|
} while (len < 0 && errno == EINTR);
|
|
|
|
close(fd);
|
|
|
|
return len;
|
|
}
|
|
|
|
/* Extract the content of a the first occurence of a given field in
|
|
* the content of /proc/cpuinfo and return it as a heap-allocated
|
|
* string that must be freed by the caller.
|
|
*
|
|
* Return NULL if not found
|
|
*/
|
|
static char*
|
|
extract_cpuinfo_field(char* buffer, int buflen, const char* field)
|
|
{
|
|
int fieldlen = strlen(field);
|
|
char* bufend = buffer + buflen;
|
|
char* result = NULL;
|
|
int len;
|
|
const char *p, *q;
|
|
|
|
/* Look for first field occurence, and ensures it starts the line.
|
|
*/
|
|
p = buffer;
|
|
bufend = buffer + buflen;
|
|
for (;;)
|
|
{
|
|
p = memmem(p, bufend-p, field, fieldlen);
|
|
if (p == NULL)
|
|
goto EXIT;
|
|
|
|
if (p == buffer || p[-1] == '\n')
|
|
break;
|
|
|
|
p += fieldlen;
|
|
}
|
|
|
|
/* Skip to the first column followed by a space */
|
|
p += fieldlen;
|
|
p = memchr(p, ':', bufend-p);
|
|
if (p == NULL || p[1] != ' ')
|
|
goto EXIT;
|
|
|
|
/* Find the end of the line */
|
|
p += 2;
|
|
q = memchr(p, '\n', bufend-p);
|
|
if (q == NULL)
|
|
q = bufend;
|
|
|
|
/* Copy the line into a heap-allocated buffer */
|
|
len = q-p;
|
|
result = malloc(len+1);
|
|
if (result == NULL)
|
|
goto EXIT;
|
|
|
|
memcpy(result, p, len);
|
|
result[len] = '\0';
|
|
|
|
EXIT:
|
|
return result;
|
|
}
|
|
|
|
/* Checks that a space-separated list of items contains one given 'item'.
|
|
* Returns 1 if found, 0 otherwise.
|
|
*/
|
|
static int
|
|
has_list_item(const char* list, const char* item)
|
|
{
|
|
const char* p = list;
|
|
int itemlen = strlen(item);
|
|
|
|
if (list == NULL)
|
|
return 0;
|
|
|
|
while (*p)
|
|
{
|
|
const char* q;
|
|
|
|
/* skip spaces */
|
|
while (*p == ' ' || *p == '\t')
|
|
p++;
|
|
|
|
/* find end of current list item */
|
|
q = p;
|
|
while (*q && *q != ' ' && *q != '\t')
|
|
q++;
|
|
|
|
if (itemlen == q-p && !memcmp(p, item, itemlen))
|
|
return 1;
|
|
|
|
/* skip to next item */
|
|
p = q;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Parse an decimal integer starting from 'input', but not going further
|
|
* than 'limit'. Return the value into '*result'.
|
|
*
|
|
* NOTE: Does not skip over leading spaces, or deal with sign characters.
|
|
* NOTE: Ignores overflows.
|
|
*
|
|
* The function returns NULL in case of error (bad format), or the new
|
|
* position after the decimal number in case of success (which will always
|
|
* be <= 'limit').
|
|
*/
|
|
static const char*
|
|
parse_decimal(const char* input, const char* limit, int* result)
|
|
{
|
|
const char* p = input;
|
|
int val = 0;
|
|
while (p < limit)
|
|
{
|
|
int d = (*p - '0');
|
|
if ((unsigned)d >= 10U)
|
|
break;
|
|
val = val*10 + d;
|
|
p++;
|
|
}
|
|
if (p == input)
|
|
return NULL;
|
|
|
|
*result = val;
|
|
return p;
|
|
}
|
|
|
|
/* This small data type is used to represent a CPU list / mask, as read
|
|
* from sysfs on Linux. See http://www.kernel.org/doc/Documentation/cputopology.txt
|
|
*
|
|
* For now, we don't expect more than 32 cores on mobile devices, so keep
|
|
* everything simple.
|
|
*/
|
|
typedef struct {
|
|
uint32_t mask;
|
|
} CpuList;
|
|
|
|
/* Parse a textual list of cpus and store the result inside a CpuList object.
|
|
* Input format is the following:
|
|
* - comma-separated list of items (no spaces)
|
|
* - each item is either a single decimal number (cpu index), or a range made
|
|
* of two numbers separated by a single dash (-). Ranges are inclusive.
|
|
*
|
|
* Examples: 0
|
|
* 2,4-127,128-143
|
|
* 0-1
|
|
*/
|
|
static void cpulist_parse(CpuList* list, const char* line, int line_len)
|
|
{
|
|
const char* p = line;
|
|
const char* end = p + line_len;
|
|
const char* q;
|
|
|
|
/* NOTE: the input line coming from sysfs typically contains a
|
|
* trailing newline, so take care of it in the code below
|
|
*/
|
|
while (p < end && *p != '\n')
|
|
{
|
|
int val, start_value, end_value;
|
|
|
|
/* Find the end of current item, and put it into 'q' */
|
|
q = memchr(p, ',', end-p);
|
|
if (q == NULL)
|
|
q = end;
|
|
|
|
/* Get first value */
|
|
p = parse_decimal(p, q, &start_value);
|
|
if (p == NULL)
|
|
goto BAD_FORMAT;
|
|
|
|
end_value = start_value;
|
|
|
|
/* If we're not at the end of the item, expect a dash and
|
|
* and integer; extract end value.
|
|
*/
|
|
if (p < q && *p == '-')
|
|
{
|
|
p = parse_decimal(p+1, q, &end_value);
|
|
if (p == NULL)
|
|
goto BAD_FORMAT;
|
|
}
|
|
|
|
/* Set bits CPU list bits */
|
|
for (val = start_value; val <= end_value; val++)
|
|
{
|
|
if ((unsigned)val < 32)
|
|
list->mask |= (uint32_t)(1U << val);
|
|
}
|
|
|
|
/* Jump to next item */
|
|
p = q;
|
|
if (p < end)
|
|
p++;
|
|
}
|
|
|
|
BAD_FORMAT:
|
|
;
|
|
}
|
|
|
|
/* Read a CPU list from one sysfs file */
|
|
static void
|
|
cpulist_read_from(CpuList* list, const char* filename)
|
|
{
|
|
char file[64];
|
|
int filelen;
|
|
|
|
list->mask = 0;
|
|
|
|
filelen = cpu_read_file(filename, file, sizeof file);
|
|
|
|
if (filelen < 0)
|
|
{
|
|
RARCH_ERR("Could not read %s: %s\n", filename, strerror(errno));
|
|
return;
|
|
}
|
|
|
|
cpulist_parse(list, file, filelen);
|
|
}
|
|
|
|
/* Return the number of cpus present on a given device.
|
|
*
|
|
* To handle all weird kernel configurations, we need to compute the
|
|
* intersection of the 'present' and 'possible' CPU lists and count
|
|
* the result.
|
|
*/
|
|
static int get_cpu_count(void)
|
|
{
|
|
CpuList cpus_present[1];
|
|
CpuList cpus_possible[1];
|
|
|
|
cpulist_read_from(cpus_present, "/sys/devices/system/cpu/present");
|
|
cpulist_read_from(cpus_possible, "/sys/devices/system/cpu/possible");
|
|
|
|
/* Compute the intersection of both sets to get the actual number of
|
|
* CPU cores that can be used on this device by the kernel.
|
|
*/
|
|
cpus_present->mask &= cpus_possible->mask;
|
|
|
|
return __builtin_popcount(cpus_present->mask);
|
|
}
|
|
|
|
static void android_cpuInit(void)
|
|
{
|
|
char cpuinfo[4096];
|
|
int cpuinfo_len;
|
|
|
|
g_cpuFamily = DEFAULT_CPU_FAMILY;
|
|
g_cpuFeatures = 0;
|
|
g_cpuCount = 1;
|
|
|
|
cpuinfo_len = cpu_read_file("/proc/cpuinfo", cpuinfo, sizeof cpuinfo);
|
|
RARCH_LOG("cpuinfo_len is (%d):\n%.*s\n", cpuinfo_len,
|
|
cpuinfo_len >= 0 ? cpuinfo_len : 0, cpuinfo);
|
|
|
|
if (cpuinfo_len < 0)
|
|
return;
|
|
|
|
/* Count the CPU cores, the value may be 0 for single-core CPUs */
|
|
g_cpuCount = get_cpu_count();
|
|
if (g_cpuCount == 0)
|
|
g_cpuCount = 1;
|
|
|
|
RARCH_LOG("found cpuCount = %d\n", g_cpuCount);
|
|
|
|
#ifdef __ARM_ARCH__
|
|
/* Extract architecture from the "CPU Architecture" field.
|
|
* The list is well-known, unlike the the output of
|
|
* the 'Processor' field which can vary greatly.
|
|
*
|
|
* See the definition of the 'proc_arch' array in
|
|
* $KERNEL/arch/arm/kernel/setup.c and the 'c_show' function in
|
|
* same file.
|
|
*/
|
|
char* cpuArch = extract_cpuinfo_field(cpuinfo, cpuinfo_len, "CPU architecture");
|
|
|
|
if (cpuArch != NULL)
|
|
{
|
|
char* end;
|
|
long archNumber;
|
|
int hasARMv7 = 0;
|
|
|
|
RARCH_LOG("found cpuArch = '%s'\n", cpuArch);
|
|
|
|
/* read the initial decimal number, ignore the rest */
|
|
archNumber = strtol(cpuArch, &end, 10);
|
|
|
|
/* Here we assume that ARMv8 will be upwards compatible with v7
|
|
* in the future. Unfortunately, there is no 'Features' field to
|
|
* indicate that Thumb-2 is supported.
|
|
*/
|
|
if (end > cpuArch && archNumber >= 7)
|
|
hasARMv7 = 1;
|
|
|
|
/* Unfortunately, it seems that certain ARMv6-based CPUs
|
|
* report an incorrect architecture number of 7!
|
|
*
|
|
* See http://code.google.com/p/android/issues/detail?id=10812
|
|
*
|
|
* We try to correct this by looking at the 'elf_format'
|
|
* field reported by the 'Processor' field, which is of the
|
|
* form of "(v7l)" for an ARMv7-based CPU, and "(v6l)" for
|
|
* an ARMv6-one.
|
|
*/
|
|
if (hasARMv7)
|
|
{
|
|
char* cpuProc = extract_cpuinfo_field(cpuinfo, cpuinfo_len,
|
|
"Processor");
|
|
if (cpuProc != NULL)
|
|
{
|
|
RARCH_LOG("found cpuProc = '%s'\n", cpuProc);
|
|
if (has_list_item(cpuProc, "(v6l)"))
|
|
{
|
|
RARCH_ERR("CPU processor and architecture mismatch!!\n");
|
|
hasARMv7 = 0;
|
|
}
|
|
free(cpuProc);
|
|
}
|
|
}
|
|
|
|
if (hasARMv7)
|
|
g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_ARMv7;
|
|
|
|
/* The LDREX / STREX instructions are available from ARMv6 */
|
|
if (archNumber >= 6)
|
|
g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_LDREX_STREX;
|
|
|
|
free(cpuArch);
|
|
}
|
|
|
|
/* Extract the list of CPU features from 'Features' field */
|
|
char* cpuFeatures = extract_cpuinfo_field(cpuinfo, cpuinfo_len, "Features");
|
|
|
|
if (cpuFeatures != NULL)
|
|
{
|
|
RARCH_LOG("found cpuFeatures = '%s'\n", cpuFeatures);
|
|
|
|
if (has_list_item(cpuFeatures, "vfpv3"))
|
|
g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFPv3;
|
|
|
|
else if (has_list_item(cpuFeatures, "vfpv3d16"))
|
|
g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFPv3;
|
|
|
|
if (has_list_item(cpuFeatures, "neon"))
|
|
{
|
|
/* Note: Certain kernels only report neon but not vfpv3
|
|
* in their features list. However, ARM mandates
|
|
* that if Neon is implemented, so must be VFPv3
|
|
* so always set the flag.
|
|
*/
|
|
g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_NEON |
|
|
ANDROID_CPU_ARM_FEATURE_VFPv3;
|
|
}
|
|
free(cpuFeatures);
|
|
}
|
|
#endif /* __ARM_ARCH__ */
|
|
|
|
#ifdef __i386__
|
|
g_cpuFamily = ANDROID_CPU_FAMILY_X86;
|
|
|
|
int regs[4];
|
|
|
|
/* According to http://en.wikipedia.org/wiki/CPUID */
|
|
#define VENDOR_INTEL_b 0x756e6547
|
|
#define VENDOR_INTEL_c 0x6c65746e
|
|
#define VENDOR_INTEL_d 0x49656e69
|
|
|
|
cpu_x86_cpuid(0, regs);
|
|
int vendorIsIntel = (regs[1] == VENDOR_INTEL_b &&
|
|
regs[2] == VENDOR_INTEL_c &&
|
|
regs[3] == VENDOR_INTEL_d);
|
|
|
|
cpu_x86_cpuid(1, regs);
|
|
if ((regs[2] & (1 << 9)) != 0)
|
|
g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_SSSE3;
|
|
if ((regs[2] & (1 << 23)) != 0)
|
|
g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_POPCNT;
|
|
if (vendorIsIntel && (regs[2] & (1 << 22)) != 0)
|
|
g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_MOVBE;
|
|
#endif
|
|
|
|
#ifdef _MIPS_ARCH
|
|
g_cpuFamily = ANDROID_CPU_FAMILY_MIPS;
|
|
#endif /* _MIPS_ARCH */
|
|
}
|
|
|
|
AndroidCpuFamily android_getCpuFamily(void)
|
|
{
|
|
pthread_once(&g_once, android_cpuInit);
|
|
return g_cpuFamily;
|
|
}
|
|
|
|
uint64_t android_getCpuFeatures(void)
|
|
{
|
|
pthread_once(&g_once, android_cpuInit);
|
|
return g_cpuFeatures;
|
|
}
|
|
|
|
int android_getCpuCount(void)
|
|
{
|
|
pthread_once(&g_once, android_cpuInit);
|
|
return g_cpuCount;
|
|
}
|