/* * (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 #include #include #include 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 /* 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) { static int done=0; int vector; struct pci_controller *pri_hose; 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) */ 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; } return 0; }