1 files changed, 126 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/sysdump/dmi.c b/contrib/syslinux-4.02/com32/sysdump/dmi.c
new file mode 100644
index 0000000..be4cce4
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/sysdump/dmi.c
@@ -0,0 +1,126 @@
+/*
+ * Dump DMI information in a way hopefully compatible with dmidecode
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "sysdump.h"
+#include "backend.h"
+
+struct dmi_header {
+    char signature[5];
+    uint8_t csum;
+    uint16_t tbllen;
+    uint32_t tbladdr;
+    uint16_t nstruc;
+    uint8_t revision;
+    uint8_t reserved;
+};
+
+struct smbios_header {
+    char signature[4];
+    uint8_t csum;
+    uint8_t len;
+    uint8_t major;
+    uint8_t minor;
+    uint16_t maxsize;
+    uint8_t revision;
+    uint8_t fmt[5];
+
+    struct dmi_header dmi;
+};
+
+static uint8_t checksum(const void *buf, size_t len)
+{
+    const uint8_t *p = buf;
+    uint8_t csum = 0;
+
+    while (len--)
+	csum += *p++;
+
+    return csum;
+}
+
+static bool is_old_dmi(size_t dptr)
+{
+    const struct dmi_header *dmi = (void *)dptr;
+
+    return !memcmp(dmi->signature, "_DMI_", 5) &&
+	!checksum(dmi, 0x0f);
+    return false;
+}
+
+static bool is_smbios(size_t dptr)
+{
+    const struct smbios_header *smb = (void *)dptr;
+
+    return !memcmp(smb->signature, "_SM_", 4) &&
+	!checksum(smb, smb->len) &&
+	is_old_dmi(dptr+16);
+}
+
+static void dump_smbios(struct backend *be, size_t dptr)
+{
+    const struct smbios_header *smb = (void *)dptr;
+    struct smbios_header smx = *smb;
+    char filename[32];
+
+    snprintf(filename, sizeof filename, "dmi/%05x.%08x",
+	     dptr, smb->dmi.tbladdr);
+    cpio_hdr(be, MODE_FILE, smb->dmi.tbllen + 32, filename);
+
+    /*
+     * Adjust the address of the smbios table to be 32, to
+     * make dmidecode happy.  The checksum on the smbios table is unchanged,
+     * since it includes the checksum on the dmi table.
+     */
+    smx.dmi.tbladdr = sizeof smx;
+    smx.dmi.csum -= checksum(&smx.dmi, 0x0f);
+
+    write_data(be, &smx, sizeof smx);
+    write_data(be, (const void *)smb->dmi.tbladdr, smb->dmi.tbllen);
+}
+
+static void dump_old_dmi(struct backend *be, size_t dptr)
+{
+    const struct dmi_header *dmi = (void *)dptr;
+    struct fake {
+	struct dmi_header dmi;
+	char pad[16];
+    } fake;
+    char filename[32];
+
+    snprintf(filename, sizeof filename, "dmi/%05x.%08x",
+	     dptr, dmi->tbladdr);
+    cpio_hdr(be, MODE_FILE, dmi->tbllen + 32, filename);
+
+    /*
+     * Adjust the address of the smbios table to be 32, to
+     * make dmidecode happy.
+     */
+    fake.dmi = *dmi;
+    memset(&fake.pad, 0, sizeof fake.pad);
+    fake.dmi.tbladdr = sizeof fake;
+    fake.dmi.csum -= checksum(&fake.dmi, 0x0f);
+
+    write_data(be, &fake, sizeof fake);
+    write_data(be, (const void *)dmi->tbladdr, dmi->tbllen);
+}
+
+void dump_dmi(struct backend *be)
+{
+    size_t dptr;
+
+    cpio_mkdir(be, "dmi");
+
+    /* Search for _SM_ or _DMI_ structure */
+    for (dptr = 0xf0000 ; dptr < 0x100000 ; dptr += 16) {
+	if (is_smbios(dptr)) {
+	    dump_smbios(be, dptr);
+	    dptr += 16;		/* Skip the subsequent DMI header */
+	} else if (is_old_dmi(dptr)) {
+	    dump_old_dmi(be, dptr);
+	}
+    }
+}