summaryrefslogtreecommitdiff
path: root/arch/i386/lib/bios_setup.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/i386/lib/bios_setup.c')
-rw-r--r--arch/i386/lib/bios_setup.c242
1 files changed, 242 insertions, 0 deletions
diff --git a/arch/i386/lib/bios_setup.c b/arch/i386/lib/bios_setup.c
new file mode 100644
index 00000000000..6491e522ec4
--- /dev/null
+++ b/arch/i386/lib/bios_setup.c
@@ -0,0 +1,242 @@
+/*
+ * (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 <pci.h>
+#include <asm/realmode.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define NUMVECTS 256
+
+#define BIOS_DATA ((char*)0x400)
+#define BIOS_DATA_SIZE 256
+#define BIOS_BASE ((char*)0xf0000)
+#define BIOS_CS 0xf000
+
+extern ulong _i386boot_bios;
+extern ulong _i386boot_bios_size;
+
+/* these are defined in a 16bit segment and needs
+ * to be accessed with the RELOC_16_xxxx() macros below
+ */
+extern u16 ram_in_64kb_chunks;
+extern u16 bios_equipment;
+extern u8 pci_last_bus;
+
+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;
+
+extern void *realmode_reset;
+extern void *realmode_pci_bios_call_entry;
+
+static int set_jmp_vector(int entry_point, void *target)
+{
+ if (entry_point & ~0xffff) {
+ return -1;
+ }
+
+ if (((u32)target-0xf0000) & ~0xffff) {
+ return -1;
+ }
+ printf("set_jmp_vector: 0xf000:%04x -> %p\n",
+ entry_point, target);
+
+ /* jmp opcode */
+ writeb(0xea, 0xf0000 + entry_point);
+
+ /* offset */
+ writew(((u32)target-0xf0000), 0xf0000 + entry_point + 1);
+
+ /* segment */
+ writew(0xf000, 0xf0000 + entry_point + 3);
+
+ return 0;
+}
+
+
+/*
+ ************************************************************
+ * 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
+}
+
+#define RELOC_16_LONG(seg, off) *(u32*)(seg << 4 | (u32)&off)
+#define RELOC_16_WORD(seg, off) *(u16*)(seg << 4 | (u32)&off)
+#define RELOC_16_BYTE(seg, off) *(u8*)(seg << 4 | (u32)&off)
+
+int bios_setup(void)
+{
+ ulong i386boot_bios = (ulong)&_i386boot_bios;
+ ulong i386boot_bios_size = (ulong)&_i386boot_bios_size;
+
+ static int done=0;
+ int vector;
+#ifdef CONFIG_PCI
+ struct pci_controller *pri_hose;
+#endif
+ 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);
+
+ set_jmp_vector(0xfff0, &realmode_reset);
+ set_jmp_vector(0xfe6e, &realmode_pci_bios_call_entry);
+
+ /* fill in data area */
+ RELOC_16_WORD(0xf000, ram_in_64kb_chunks) = gd->ram_size >> 16;
+ RELOC_16_WORD(0xf000, bios_equipment) = 0; /* FixMe */
+
+ /* If we assume only one PCI hose, this PCI hose
+ * will own PCI bus #0, and the last PCI bus of
+ * that PCI hose will be the last PCI bus in the
+ * system.
+ * (This, ofcause break on multi hose systems,
+ * but our PCI BIOS only support one hose anyway)
+ */
+#ifdef CONFIG_PCI
+ pri_hose = pci_bus_to_hose(0);
+ if (NULL != pri_hose) {
+ /* fill in last pci bus number for use by the realmode
+ * PCI BIOS */
+ RELOC_16_BYTE(0xf000, pci_last_bus) = pri_hose->last_busno;
+ }
+#endif
+ return 0;
+}