Merge tag 'pull-maintainer-may24-160524-2' of https://gitlab.com/stsquad/qemu into...

[mirror_qemu.git] / util / cacheinfo.c

diff --git a/util/cacheinfo.c b/util/cacheinfo.c
deleted file mode 100644 (file)
index 593940f..0000000
--- a/util/cacheinfo.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/*
- * cacheinfo.c - helpers to query the host about its caches
- *
- * Copyright (C) 2017, Emilio G. Cota <cota@braap.org>
- * License: GNU GPL, version 2 or later.
- *   See the COPYING file in the top-level directory.
- */
-
-#include "qemu/osdep.h"
-
-int qemu_icache_linesize = 0;
-int qemu_dcache_linesize = 0;
-
-/*
- * Operating system specific detection mechanisms.
- */
-
-#if defined(_AIX)
-# include <sys/systemcfg.h>
-
-static void sys_cache_info(int *isize, int *dsize)
-{
-    *isize = _system_configuration.icache_line;
-    *dsize = _system_configuration.dcache_line;
-}
-
-#elif defined(_WIN32)
-
-static void sys_cache_info(int *isize, int *dsize)
-{
-    SYSTEM_LOGICAL_PROCESSOR_INFORMATION *buf;
-    DWORD size = 0;
-    BOOL success;
-    size_t i, n;
-
-    /* Check for the required buffer size first.  Note that if the zero
-       size we use for the probe results in success, then there is no
-       data available; fail in that case.  */
-    success = GetLogicalProcessorInformation(0, &size);
-    if (success || GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
-        return;
-    }
-
-    n = size / sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
-    size = n * sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
-    buf = g_new0(SYSTEM_LOGICAL_PROCESSOR_INFORMATION, n);
-    if (!GetLogicalProcessorInformation(buf, &size)) {
-        goto fail;
-    }
-
-    for (i = 0; i < n; i++) {
-        if (buf[i].Relationship == RelationCache
-            && buf[i].Cache.Level == 1) {
-            switch (buf[i].Cache.Type) {
-            case CacheUnified:
-                *isize = *dsize = buf[i].Cache.LineSize;
-                break;
-            case CacheInstruction:
-                *isize = buf[i].Cache.LineSize;
-                break;
-            case CacheData:
-                *dsize = buf[i].Cache.LineSize;
-                break;
-            default:
-                break;
-            }
-        }
-    }
- fail:
-    g_free(buf);
-}
-
-#elif defined(__APPLE__) \
-      || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
-# include <sys/sysctl.h>
-# if defined(__APPLE__)
-#  define SYSCTL_CACHELINE_NAME "hw.cachelinesize"
-# else
-#  define SYSCTL_CACHELINE_NAME "machdep.cacheline_size"
-# endif
-
-static void sys_cache_info(int *isize, int *dsize)
-{
-    /* There's only a single sysctl for both I/D cache line sizes.  */
-    long size;
-    size_t len = sizeof(size);
-    if (!sysctlbyname(SYSCTL_CACHELINE_NAME, &size, &len, NULL, 0)) {
-        *isize = *dsize = size;
-    }
-}
-
-#else
-/* POSIX */
-
-static void sys_cache_info(int *isize, int *dsize)
-{
-# ifdef _SC_LEVEL1_ICACHE_LINESIZE
-    *isize = sysconf(_SC_LEVEL1_ICACHE_LINESIZE);
-# endif
-# ifdef _SC_LEVEL1_DCACHE_LINESIZE
-    *dsize = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
-# endif
-}
-#endif /* sys_cache_info */
-
-/*
- * Architecture (+ OS) specific detection mechanisms.
- */
-
-#if defined(__aarch64__)
-
-static void arch_cache_info(int *isize, int *dsize)
-{
-    if (*isize == 0 || *dsize == 0) {
-        unsigned long ctr;
-
-        /* The real cache geometry is in CCSIDR_EL1/CLIDR_EL1/CSSELR_EL1,
-           but (at least under Linux) these are marked protected by the
-           kernel.  However, CTR_EL0 contains the minimum linesize in the
-           entire hierarchy, and is used by userspace cache flushing.  */
-        asm volatile("mrs\t%0, ctr_el0" : "=r"(ctr));
-        if (*isize == 0) {
-            *isize = 4 << (ctr & 0xf);
-        }
-        if (*dsize == 0) {
-            *dsize = 4 << ((ctr >> 16) & 0xf);
-        }
-    }
-}
-
-#elif defined(_ARCH_PPC) && defined(__linux__)
-# include "elf.h"
-
-static void arch_cache_info(int *isize, int *dsize)
-{
-    if (*isize == 0) {
-        *isize = qemu_getauxval(AT_ICACHEBSIZE);
-    }
-    if (*dsize == 0) {
-        *dsize = qemu_getauxval(AT_DCACHEBSIZE);
-    }
-}
-
-#else
-static void arch_cache_info(int *isize, int *dsize) { }
-#endif /* arch_cache_info */
-
-/*
- * ... and if all else fails ...
- */
-
-static void fallback_cache_info(int *isize, int *dsize)
-{
-    /* If we can only find one of the two, assume they're the same.  */
-    if (*isize) {
-        if (*dsize) {
-            /* Success! */
-        } else {
-            *dsize = *isize;
-        }
-    } else if (*dsize) {
-        *isize = *dsize;
-    } else {
-#if defined(_ARCH_PPC)
-        /* For PPC, we're going to use the icache size computed for
-           flush_icache_range.  Which means that we must use the
-           architecture minimum.  */
-        *isize = *dsize = 16;
-#else
-        /* Otherwise, 64 bytes is not uncommon.  */
-        *isize = *dsize = 64;
-#endif
-    }
-}
-
-static void __attribute__((constructor)) init_cache_info(void)
-{
-    int isize = 0, dsize = 0;
-
-    sys_cache_info(&isize, &dsize);
-    arch_cache_info(&isize, &dsize);
-    fallback_cache_info(&isize, &dsize);
-
-    qemu_icache_linesize = isize;
-    qemu_dcache_linesize = dsize;
-}