Introduce and use cache-utils.[ch]

[qemu.git] / cache-utils.h

diff --git a/cache-utils.h b/cache-utils.h
new file mode 100644 (file)
index 0000000..0598b96
--- /dev/null
+++ b/cache-utils.h
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+#ifndef QEMU_CACHE_UTILS_H
+#define QEMU_CACHE_UTILS_H
+
+#ifdef __powerpc__
+struct qemu_cache_conf {
+    unsigned long dcache_bsize;
+    unsigned long icache_bsize;
+};
+
+extern struct qemu_cache_conf qemu_cache_conf;
+
+extern void qemu_cache_utils_init(char **envp);
+
+/* mildly adjusted code from tcg-dyngen.c */
+static inline void flush_icache_range(unsigned long start, unsigned long stop)
+{
+    unsigned long p, start1, stop1;
+    unsigned long dsize = qemu_cache_conf.dcache_bsize;
+    unsigned long isize = qemu_cache_conf.icache_bsize;
+
+    start1 = start & ~(dsize - 1);
+    stop1 = (stop + dsize - 1) & ~(dsize - 1);
+    for (p = start1; p < stop1; p += dsize) {
+        asm volatile ("dcbst 0,%0" : : "r"(p) : "memory");
+    }
+    asm volatile ("sync" : : : "memory");
+
+    start &= start & ~(isize - 1);
+    stop1 = (stop + isize - 1) & ~(isize - 1);
+    for (p = start1; p < stop1; p += isize) {
+        asm volatile ("icbi 0,%0" : : "r"(p) : "memory");
+    }
+    asm volatile ("sync" : : : "memory");
+    asm volatile ("isync" : : : "memory");
+}
+
+#else
+#define qemu_cache_utils_init(envp) do { (void) (envp); } while (0)
+#endif
+
+#endif /* QEMU_CACHE_UTILS_H */