1 files changed, 91 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/sysdump/cpuid.c b/contrib/syslinux-4.02/com32/sysdump/cpuid.c
new file mode 100644
index 0000000..372a70d
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/sysdump/cpuid.c
@@ -0,0 +1,91 @@
+/*
+ * Dump CPUID information
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <com32.h>
+#include <sys/cpu.h>
+#include "sysdump.h"
+#include "backend.h"
+
+struct cpuid_data {
+    uint32_t eax, ebx, ecx, edx;
+};
+
+struct cpuid_info {
+    uint32_t eax, ecx;
+    struct cpuid_data data;
+};
+
+static void get_cpuid(uint32_t eax, uint32_t ecx, struct cpuid_data *data)
+{
+    asm("pushl %%ebx ; cpuid ; movl %%ebx,%1 ; popl %%ebx"
+	: "=a" (data->eax), "=r" (data->ebx),
+	  "=c" (data->ecx), "=d" (data->edx)
+	: "a" (eax), "c" (ecx));
+}
+
+#define CPUID_CHUNK 128
+
+void dump_cpuid(struct backend *be)
+{
+    struct cpuid_info *buf = NULL;
+    int nentry, nalloc;
+    uint32_t region;
+    struct cpuid_data base_leaf;
+    uint32_t base, leaf, count;
+    struct cpuid_data invalid_leaf;
+    struct cpuid_data data;
+
+    if (!cpu_has_eflag(EFLAGS_ID))
+	return;
+
+    printf("Dumping CPUID... ");
+
+    nentry = nalloc = 0;
+
+    /* Find out what the CPU returns for invalid leaves */
+    get_cpuid(0, 0, &base_leaf);
+    get_cpuid(base_leaf.eax+1, 0, &invalid_leaf);
+
+    for (region = 0 ; region <= 0xffff ; region++) {
+	base = region << 16;
+
+	get_cpuid(base, 0, &base_leaf);
+	if (region && !memcmp(&base_leaf, &invalid_leaf, sizeof base_leaf))
+	    continue;
+
+	if ((base_leaf.eax ^ base) & 0xffff0000)
+	    continue;
+
+	for (leaf = base ; leaf <= base_leaf.eax ; leaf++) {
+	    get_cpuid(leaf, 0, &data);
+	    count = 0;
+
+	    do {
+		if (nentry >= nalloc) {
+		    nalloc += CPUID_CHUNK;
+		    buf = realloc(buf, nalloc*sizeof *buf);
+		    if (!buf)
+			return;		/* FAILED */
+		}
+		buf[nentry].eax = leaf;
+		buf[nentry].ecx = count;
+		buf[nentry].data = data;
+		nentry++;
+		count++;
+
+		get_cpuid(leaf, count, &data);
+	    } while (memcmp(&data, &buf[nentry-1].data, sizeof data) &&
+		     (data.eax | data.ebx | data.ecx | data.edx));
+	}
+    }
+
+    if (nentry)
+	cpio_writefile(be, "cpuid", buf, nentry*sizeof *buf);
+    free(buf);
+
+    printf("done.\n");
+}