/*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, daniel@omicron.se
- *
+ *
* See file CREDITS for list of people who contributed to this
* project.
*
*/
#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_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_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
u16 *ptr = (u16*)(vector*4);
ptr[0] = ((u32)handler - (segment << 4))&0xffff;
ptr[1] = segment;
-
-#if 0
+
+#if 0
printf("setvector: int%02x -> %04x:%04x\n",
vector, ptr[1], ptr[0]);
-#endif
+#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)
{
- DECLARE_GLOBAL_DATA_PTR;
- static int done=0;
+ 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",
+ 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(0, BIOS_DATA+0x13); /* base memory size */
-
- /* setup realmode interrupt vectors */
+
+ /* 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(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 */
- ram_in_64kb_chunks = gd->ram_size >> 16;
- bios_equipment = 0; /* FixMe */
-
+ 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;
}
-