1 files changed, 129 insertions, 0 deletions
diff --git a/stand/i386/kgzldr/boot.c b/stand/i386/kgzldr/boot.c
new file mode 100644
index 0000000..45ed2ee
--- /dev/null
+++ b/stand/i386/kgzldr/boot.c
@@ -0,0 +1,129 @@
+/*-
+ * Copyright (c) 1999 Global Technology Associates, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/reboot.h>
+#include <sys/inflate.h>
+
+#include "kgzldr.h"
+
+#define KGZ_HEAD   0xa          /* leading bytes to ignore */
+#define KGZ_TAIL   0x8          /* trailing bytes to ignore */
+
+#define E_FMT  1		/* Error: Invalid format */
+#define E_MEM  2		/* Error: Out of memory */
+
+struct kgz_hdr {
+    char	ident[4];	/* identification */
+    uint32_t	dload;		/* decoded image load address */
+    uint32_t	dsize;		/* decoded image size */
+    uint32_t	isize;		/* image size in memory */
+    uint32_t	entry;		/* program entry point */
+    uint32_t	nsize;		/* encoded image size */
+};
+extern struct kgz_hdr kgz;	/* header */
+extern uint8_t kgz_ndata[];	/* encoded image */
+
+static const char *const msg[] = {
+    "done",
+    "invalid format",
+    "out of memory"
+};
+
+static const u_char *ip;        /* input pointer */
+static u_char *op;              /* output pointer */
+
+static struct inflate infl;	/* inflate() parameters */
+
+static int decode(void);
+static int input(void *);
+static int output(void *, u_char *, u_long);
+
+/*
+ * Uncompress and boot a kernel.
+ */
+int
+boot(int howto)
+{
+    int err;
+
+    kgz_con = howto & RB_SERIAL ? KGZ_SIO : KGZ_CRT;
+    putstr("Uncompressing ... ");
+    err = decode();
+    putstr(msg[err]);
+    putstr("\n");
+    if (err) {
+        putstr("System halted");
+	for (;;)
+	    ;
+    }
+    return err;
+}
+
+/*
+ * Interface with inflate() to uncompress the data.
+ */
+static int
+decode(void)
+{
+    static u_char slide[GZ_WSIZE];
+    int err;
+
+    ip = kgz_ndata + KGZ_HEAD;
+    op = (u_char *)kgz.dload;
+    infl.gz_input = input;
+    infl.gz_output = output;
+    infl.gz_slide = slide;
+    err = inflate(&infl);
+    return err ? err == 3 ? E_MEM : E_FMT : 0;
+}
+
+/*
+ * Read a byte.
+ */
+static int
+input(void *dummy)
+{
+    if ((size_t)(ip - kgz_ndata) + KGZ_TAIL > kgz.nsize)
+        return GZ_EOF;
+    return *ip++;
+}
+
+/*
+ * Write some bytes.
+ */
+static int
+output(void *dummy, u_char * ptr, u_long len)
+{
+    if (op - (u_char *)kgz.dload + len > kgz.dsize)
+        return -1;
+    while (len--)
+        *op++ = *ptr++;
+    return 0;
+}