util: add cacheinfo

Add helpers to gather cache info from the host at init-time.

For now, only export the host's I/D cache line sizes, which we
will use to improve cache locality to avoid false sharing.

Suggested-by: Richard Henderson <rth@twiddle.net>
Suggested-by: Geert Martin Ijewski <gm.ijewski@web.de>
Tested-by:    Geert Martin Ijewski <gm.ijewski@web.de>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1496794624-4083-1-git-send-email-cota@braap.org>
[rth: Move all implementations from tcg/ppc/]
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 2 insertions, 69 deletions

diff --git a/tcg/ppc/tcg-target.inc.c b/tcg/ppc/tcg-target.inc.c
index 8d50f18328..1f690df20d 100644
--- a/tcg/ppc/tcg-target.inc.c
+++ b/tcg/ppc/tcg-target.inc.c
@@ -2820,14 +2820,11 @@ void tcg_register_jit(void *buf, size_t buf_size)
 }
 #endif /* __ELF__ */
 
-static size_t dcache_bsize = 16;
-static size_t icache_bsize = 16;
-
 void flush_icache_range(uintptr_t start, uintptr_t stop)
 {
     uintptr_t p, start1, stop1;
-    size_t dsize = dcache_bsize;
-    size_t isize = icache_bsize;
+    size_t dsize = qemu_dcache_linesize;
+    size_t isize = qemu_icache_linesize;
 
     start1 = start & ~(dsize - 1);
     stop1 = (stop + dsize - 1) & ~(dsize - 1);
@@ -2844,67 +2841,3 @@ void flush_icache_range(uintptr_t start, uintptr_t stop)
     asm volatile ("sync" : : : "memory");
     asm volatile ("isync" : : : "memory");
 }
-
-#if defined _AIX
-#include <sys/systemcfg.h>
-
-static void __attribute__((constructor)) tcg_cache_init(void)
-{
-    icache_bsize = _system_configuration.icache_line;
-    dcache_bsize = _system_configuration.dcache_line;
-}
-
-#elif defined __linux__
-static void __attribute__((constructor)) tcg_cache_init(void)
-{
-    unsigned long dsize = qemu_getauxval(AT_DCACHEBSIZE);
-    unsigned long isize = qemu_getauxval(AT_ICACHEBSIZE);
-
-    if (dsize == 0 || isize == 0) {
-        if (dsize == 0) {
-            fprintf(stderr, "getauxval AT_DCACHEBSIZE failed\n");
-        }
-        if (isize == 0) {
-            fprintf(stderr, "getauxval AT_ICACHEBSIZE failed\n");
-        }
-        exit(1);
-    }
-    dcache_bsize = dsize;
-    icache_bsize = isize;
-}
-
-#elif defined __APPLE__
-#include <sys/sysctl.h>
-
-static void __attribute__((constructor)) tcg_cache_init(void)
-{
-    size_t len;
-    unsigned cacheline;
-    int name[2] = { CTL_HW, HW_CACHELINE };
-
-    len = sizeof(cacheline);
-    if (sysctl(name, 2, &cacheline, &len, NULL, 0)) {
-        perror("sysctl CTL_HW HW_CACHELINE failed");
-        exit(1);
-    }
-    dcache_bsize = cacheline;
-    icache_bsize = cacheline;
-}
-
-#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
-#include <sys/sysctl.h>
-
-static void __attribute__((constructor)) tcg_cache_init(void)
-{
-    size_t len = 4;
-    unsigned cacheline;
-
-    if (sysctlbyname ("machdep.cacheline_size", &cacheline, &len, NULL, 0)) {
-        fprintf(stderr, "sysctlbyname machdep.cacheline_size failed: %s\n",
-                strerror(errno));
-        exit(1);
-    }
-    dcache_bsize = cacheline;
-    icache_bsize = cacheline;
-}
-#endif