From: weingart <weingart@openbsd.org>
Date: Fri, 4 Apr 1997 17:23:29 +0000 (+0000)
Subject: Replace exec_i386.S with these two files.  Startprog.S is a
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=ac7f824a44a5d7989c41a68344a271f623bfad57;p=openbsd

Replace exec_i386.S with these two files.  Startprog.S is a
stopgap measure, to be removed once I get locore.s done.
---

diff --git a/sys/arch/i386/stand/libsa/exec_i386.c b/sys/arch/i386/stand/libsa/exec_i386.c
new file mode 100644
index 00000000000..0cf8f40987a
--- /dev/null
+++ b/sys/arch/i386/stand/libsa/exec_i386.c
@@ -0,0 +1,79 @@
+
+/* $OpenBSD: exec_i386.c,v 1.4 1997/04/04 17:23:29 weingart Exp $ */
+
+#include <sys/param.h>
+#include <sys/exec.h>
+#include <sys/reboot.h>
+#include <libsa.h>
+
+#include <biosdev.h>
+int startprog(void *, void *);
+static int bootdev;
+
+void
+machdep_start(startaddr, howto, loadaddr, ssym, esym)
+	char *startaddr, *loadaddr, *ssym, *esym;
+	int howto;
+{
+	static int argv[9];
+	struct exec *x;
+
+
+#ifdef DEBUG
+	x = (void *)loadaddr;
+	printf("exec {\n");
+	printf("  a_midmag = %lx\n", x->a_midmag);
+	printf("  a_text = %lx\n", x->a_text);
+	printf("  a_data = %lx\n", x->a_data);
+	printf("  a_bss = %lx\n", x->a_bss);
+	printf("  a_syms = %lx\n", x->a_syms);
+	printf("  a_entry = %lx\n", x->a_entry);
+	printf("  a_trsize = %lx\n", x->a_trsize);
+	printf("  a_drsize = %lx\n", x->a_drsize);
+	printf("}\n");
+
+	getchar();
+#endif
+
+	(int)startaddr &= 0xffffff;
+
+	/*
+	 *  We now pass the various bootstrap parameters to the loaded
+	 *  image via the argument list
+	 *
+	 *  arg0 = 8 (magic)
+	 *  arg1 = boot flags
+	 *  arg2 = boot device
+	 *  arg3 = start of symbol table (0 if not loaded)
+	 *  arg4 = end of symbol table (0 if not loaded)
+	 *  arg5 = transfer address from image
+	 *  arg6 = transfer address for next image pointer
+	 *  arg7 = conventional memory size (640)
+	 *  arg8 = extended memory size (8196)
+	 */
+	argv[0] = 8;
+	argv[1] = howto;
+	argv[2] = bootdev;
+	argv[3] = (int)ssym;
+	argv[4] = (int)esym;
+	argv[5] = (int)startaddr;
+	argv[6] = 0;
+	argv[7] = biosmem(0);
+	argv[8] = biosmem(1);
+
+#ifdef DEBUG
+	{ int i;
+		for(i = 0; i <= argv[0]; i++)
+			printf("argv[%d] = %x\n", i, argv[i]);
+
+		getchar();
+	}
+#endif
+
+	/****************************************************************/
+	/* copy that first page and overwrite any BIOS variables        */
+	/****************************************************************/
+	printf("entry point at 0x%x\n", (int)startaddr);
+	startprog(startaddr, argv);
+}
+
diff --git a/sys/arch/i386/stand/libsa/startprog.S b/sys/arch/i386/stand/libsa/startprog.S
new file mode 100644
index 00000000000..b8e248f561f
--- /dev/null
+++ b/sys/arch/i386/stand/libsa/startprog.S
@@ -0,0 +1,48 @@
+/*	$OpenBSD: startprog.S,v 1.4 1997/04/04 17:23:31 weingart Exp $	*/
+
+#include <machine/asm.h>
+
+
+/*
+ * startprog(phyaddr, argv)
+ *	start the program on protected mode where phyaddr is the entry point
+ */
+ENTRY(startprog)
+	pushl	%ebp
+	movl	%esp, %ebp
+
+	# get things we need into registers
+	movl	8(%ebp), %ecx		# entry offset 
+	movl	12(%ebp), %eax		# &argv
+
+	# make a new stack at 0:0x90000 (big segs)
+	movl	$0x10, %ebx
+	movw	%bx, %ss
+	movl	$0x90000, %ebx
+	movl	%ebx, %esp
+
+	# push some number of args onto the stack
+	pushl	28(%eax)		# argv[7] = cnvmem
+	pushl	32(%eax)		# argv[8] = extmem
+	pushl	16(%eax)		# argv[4] = esym
+	pushl	12(%eax)		# argv[3] = cyl offset
+	pushl	8(%eax)			# argv[2] = bootdev
+	pushl	4(%eax)			# argv[1] = howto
+	pushl	$0			# dummy 'return' address
+
+	# push on our entry address
+	movl	$0x8, %ebx		# segment
+	pushl	%ebx
+	pushl	%ecx
+
+	# convert over the other data segs
+	movl	$0x10, %ebx
+	movl	%bx, %ds
+	movl	%bx, %es
+	movl	%bx, %ss
+	movl	%bx, %fs
+	movl	%bx, %gs
+
+	# convert the PC (and code seg)
+	lret
+