* Patch by Daniel Engström, 13 Nov 2002:

  Add support for i386 architecture and AMD SC520 board

* Patch by Pierre Aubert, 12 Nov 2002:
  Add support for DOS filesystem and booting from DOS floppy disk

1 files changed, 178 insertions, 0 deletions

diff --git a/lib_i386/bios_setup.c b/lib_i386/bios_setup.c
new file mode 100644
index 0000000..94319af
--- /dev/null
+++ b/lib_i386/bios_setup.c
@@ -0,0 +1,178 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
+ * 
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+
+/*
+ * Partly based on msbios.c from rolo 1.6:
+ *----------------------------------------------------------------------
+ * (C) Copyright 2000
+ * Sysgo Real-Time Solutions GmbH
+ * Klein-Winternheim, Germany
+ *----------------------------------------------------------------------
+ */
+
+#include <common.h>
+#include <asm/realmode.h>
+#include <asm/io.h>
+
+#define NUMVECTS	256
+
+#define BIOS_DATA        ((char*)0x400)
+#define BIOS_DATA_SIZE   256
+#define BIOS_BASE        ((char*)0xf0000)
+#define BIOS_CS          0xf000
+
+extern u16 ram_in_64kb_chunks;
+extern u16 bios_equipment;
+extern void *rm_int00;
+extern void *rm_int01;
+extern void *rm_int02;
+extern void *rm_int03;
+extern void *rm_int04;
+extern void *rm_int05;
+extern void *rm_int06;
+extern void *rm_int07;
+extern void *rm_int08;
+extern void *rm_int09;
+extern void *rm_int0a;
+extern void *rm_int0b;
+extern void *rm_int0c;
+extern void *rm_int0d;
+extern void *rm_int0e;
+extern void *rm_int0f;
+extern void *rm_int10;
+extern void *rm_int11;
+extern void *rm_int12;
+extern void *rm_int13;
+extern void *rm_int14;
+extern void *rm_int15;
+extern void *rm_int16;
+extern void *rm_int17;
+extern void *rm_int18;
+extern void *rm_int19;
+extern void *rm_int1a;
+extern void *rm_int1b;
+extern void *rm_int1c;
+extern void *rm_int1d;
+extern void *rm_int1e;
+extern void *rm_int1f;
+extern void *rm_def_int;
+
+/*
+ ************************************************************
+ * Install an interrupt vector
+ ************************************************************
+ */
+
+static void setvector(int vector, u16 segment, void *handler)
+{
+	u16 *ptr = (u16*)(vector*4);
+	ptr[0] = ((u32)handler - (segment << 4))&0xffff;
+	ptr[1] = segment;
+	
+#if 0	
+	printf("setvector: int%02x -> %04x:%04x\n",
+	       vector, ptr[1], ptr[0]);
+#endif	
+}
+
+int bios_setup(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	static int done=0;	
+	int vector;
+	
+	if (done) {
+		return 0;
+	}
+	done = 1;
+	
+	if (i386boot_bios_size > 65536) {
+		printf("BIOS too large (%ld bytes, max is 65536)\n", 
+		       i386boot_bios_size);
+		return -1;
+	}
+	
+	memcpy(BIOS_BASE, (void*)i386boot_bios, i386boot_bios_size);
+
+	/* clear bda */
+	memset(BIOS_DATA, 0, BIOS_DATA_SIZE);
+	
+	/* enter some values to the bda */
+	writew(0x3f8, BIOS_DATA);   /* com1 addr */
+	writew(0x2f8, BIOS_DATA+2); /* com2 addr */
+	writew(0x3e8, BIOS_DATA+4); /* com3 addr */
+	writew(0x2e8, BIOS_DATA+6); /* com4 addr */
+	writew(0x278, BIOS_DATA+8); /* lpt1 addr */
+	/*
+	 * The kernel wants to read the base memory size
+	 * from 40:13. Put a zero there to avoid an error message
+	 */
+	writew(0, BIOS_DATA+0x13);  /* base memory size */
+
+	
+	/* setup realmode interrupt vectors */	
+	for (vector = 0; vector < NUMVECTS; vector++) {
+		setvector(vector, BIOS_CS, &rm_def_int);
+	}
+	
+	setvector(0x00, BIOS_CS, &rm_int00);
+	setvector(0x01, BIOS_CS, &rm_int01);
+	setvector(0x02, BIOS_CS, &rm_int02);
+	setvector(0x03, BIOS_CS, &rm_int03);
+	setvector(0x04, BIOS_CS, &rm_int04);
+	setvector(0x05, BIOS_CS, &rm_int05);
+	setvector(0x06, BIOS_CS, &rm_int06);
+	setvector(0x07, BIOS_CS, &rm_int07);
+	setvector(0x08, BIOS_CS, &rm_int08);
+	setvector(0x09, BIOS_CS, &rm_int09);
+	setvector(0x0a, BIOS_CS, &rm_int0a);
+	setvector(0x0b, BIOS_CS, &rm_int0b);
+	setvector(0x0c, BIOS_CS, &rm_int0c);
+	setvector(0x0d, BIOS_CS, &rm_int0d);
+	setvector(0x0e, BIOS_CS, &rm_int0e);
+	setvector(0x0f, BIOS_CS, &rm_int0f);
+	setvector(0x10, BIOS_CS, &rm_int10);
+	setvector(0x11, BIOS_CS, &rm_int11);
+	setvector(0x12, BIOS_CS, &rm_int12);
+	setvector(0x13, BIOS_CS, &rm_int13);
+	setvector(0x14, BIOS_CS, &rm_int14);
+	setvector(0x15, BIOS_CS, &rm_int15);
+	setvector(0x16, BIOS_CS, &rm_int16);
+	setvector(0x17, BIOS_CS, &rm_int17);
+	setvector(0x18, BIOS_CS, &rm_int18);
+	setvector(0x19, BIOS_CS, &rm_int19);
+	setvector(0x1a, BIOS_CS, &rm_int1a);
+	setvector(0x1b, BIOS_CS, &rm_int1b);
+	setvector(0x1c, BIOS_CS, &rm_int1c);
+	setvector(0x1d, BIOS_CS, &rm_int1d);
+	setvector(0x1e, BIOS_CS, &rm_int1e);
+	setvector(0x1f, BIOS_CS, &rm_int1f);
+
+	/* fill in data area */
+	ram_in_64kb_chunks = gd->ram_size >> 16;
+	bios_equipment = 0; /* FixMe */
+	
+	return 0;
+}
+