Generalize ipappend handling as "sysappend", and move to PM code

Generalize the ipappend handling to cover all the derivatives, and
rename it "sysappend" ("ipappend" is a valid alias for all
derivatives.)  Move all the string handling to protected mode.
Currently only pxelinux exports strings, but the plan is to change
that in the future.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/core/sysappend.c b/core/sysappend.c
new file mode 100644
index 00000000..ac35b226
--- /dev/null
+++ b/core/sysappend.c
@@ -0,0 +1,61 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2011 Intel Corporation; author: H. Peter Anvin
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ *   Boston MA 02110-1301, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+#include <string.h>
+#include <stdio.h>
+#include "core.h"
+
+/*
+ * sysappend.c
+ *
+ */
+
+extern uint32_t SysAppends;	/* Configuration variable */
+const char *sysappend_strings[SYSAPPEND_MAX];
+
+/*
+ * Handle sysappend strings for the old real-mode command line generator...
+ * this code should be replaced when all that code is coverted to C.
+ *
+ * Writes the output to ES:DI with a space after each option,
+ * and updates DI to point to the final null.
+ */
+void do_sysappend(com32sys_t *regs)
+{
+    char *q = MK_PTR(regs->es, regs->ebx.w[0]);
+    int i;
+    uint32_t mask = SysAppends;
+
+    for (i = 0; i < SYSAPPEND_MAX; i++) {
+	if (mask & 1) {
+	    q = stpcpy(q, sysappend_strings[i]);
+	    *q++ = ' ';
+	}
+	mask >>= 1;
+    }
+    *q = '\0';
+
+    regs->ebx.w[0] = OFFS_WRT(q, regs->es);
+}
+
+/*
+ * Print the sysappend strings, in order
+ */
+void print_sysappend(void)
+{
+    int i;
+
+    for (i = 0; i < SYSAPPEND_MAX; i++) {
+	if (sysappend_strings[i])
+	    printf("%s\n", sysappend_strings[i]);
+    }
+}