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ircd::info: Query cpuid features on init.

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This commit is contained in:
Jason Volk 2019-03-31 16:06:17 -07:00
parent 04959d946c
commit 9e61cf7bc0
3 changed files with 92 additions and 2 deletions
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1
configure.ac
View file

@ -750,6 +750,7 @@ RB_CHK_SYSHEADER(iphlpapi.h, [IPHLPAPI_H])
dnl x86 platform
RB_CHK_SYSHEADER(x86intrin.h, [X86INTRIN_H])
RB_CHK_SYSHEADER(cpuid.h, [CPUID_H])
dnl experimental
RB_CHK_SYSHEADER(experimental/string_view, [EXPERIMENTAL_STRING_VIEW])

6
include/ircd/info.h
View file

@ -32,11 +32,15 @@ namespace ircd::info
extern const string_view compiled;
extern const string_view startup;
// System information
// Platform information
extern const size_t max_align;
extern const size_t hardware_concurrency;
extern const size_t destructive_interference;
extern const size_t constructive_interference;
extern const uint128_t cpuid[8];
extern const string_view cpuvendor;
// System information
extern const size_t page_size;
extern const size_t iov_max;
extern const size_t aio_max;

87
ircd/info.cc
View file

@ -10,6 +10,7 @@
#include <RB_INC_SYS_RESOURCE_H
#include <RB_INC_UNISTD_H
#include <RB_INC_CPUID_H
void
ircd::info::init()
@ -66,7 +67,8 @@ ircd::info::dump()
// IRCd is compiled for and running on.
log::debug
{
"page_size=%zu max_align=%zu hw_conc=%zu d_inter=%zu c_inter=%zu",
"cpu[%s] page_size=%zu max_align=%zu hw_conc=%zu d_inter=%zu c_inter=%zu",
cpuvendor,
page_size,
max_align,
hardware_concurrency,
@ -332,6 +334,89 @@ ircd::info::page_size
#endif
};
//
// Platform information
//
#ifdef HAVE_CPUID_H
static ircd::uint128_t
get_cpuid(const uint &leaf,
const uint &subleaf)
{
using ircd::uint128_t;
uint32_t reg[4];
asm volatile
(
"cpuid" "\n\t"
: "=a" (reg[0]),
"=b" (reg[1]),
"=c" (reg[2]),
"=d" (reg[3])
: "0" (leaf),
"2" (subleaf)
);
return uint128_t
{
(uint128_t(reg[3]) << 96) | // edx
(uint128_t(reg[2]) << 64) | // ecx
(uint128_t(reg[1]) << 32) | // ebx
(uint128_t(reg[0]) << 0) // eax
};
}
#else
static ircd::uint128_t
get_cpuid(const uint &leaf,
const uint &subleaf)
{
return 0;
}
#endif
decltype(ircd::info::cpuid)
ircd::info::cpuid
{
get_cpuid(0x00000000U, 0),
get_cpuid(0x00000001U, 0),
get_cpuid(0x00000002U, 0),
get_cpuid(0x00000004U, 0),
get_cpuid(0x80000000U, 0),
0UL,
0UL,
0UL,
};
char
_cpuvendor_[16];
decltype(ircd::info::cpuvendor)
ircd::info::cpuvendor{[&]
{
const auto b
{
reinterpret_cast<const uint8_t *>(cpuid + 0)
};
_cpuvendor_[0] = b[4];
_cpuvendor_[1] = b[5];
_cpuvendor_[2] = b[6];
_cpuvendor_[3] = b[7];
_cpuvendor_[4] = b[12];
_cpuvendor_[5] = b[13];
_cpuvendor_[6] = b[14];
_cpuvendor_[7] = b[15];
_cpuvendor_[8] = b[8];
_cpuvendor_[9] = b[9];
_cpuvendor_[10] = b[10];
_cpuvendor_[11] = b[11];
return string_view
{
_cpuvendor_, sizeof(_cpuvendor_)
};
}()};
decltype(ircd::info::constructive_interference)
ircd::info::constructive_interference
{