diff options
Diffstat (limited to 'sys/i386/boot/table.c')
| -rw-r--r-- | sys/i386/boot/table.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/sys/i386/boot/table.c b/sys/i386/boot/table.c new file mode 100644 index 0000000..c53173d --- /dev/null +++ b/sys/i386/boot/table.c @@ -0,0 +1,125 @@ +/* + * Mach Operating System + * Copyright (c) 1992, 1991 Carnegie Mellon University + * All Rights Reserved. + * + * Permission to use, copy, modify and distribute this software and its + * documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR + * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie Mellon + * the rights to redistribute these changes. + * + * from: Mach, Revision 2.2 92/04/04 11:36:43 rpd + * $Id$ + */ + +/* + Copyright 1988, 1989, 1990, 1991, 1992 + by Intel Corporation, Santa Clara, California. + + All Rights Reserved + +Permission to use, copy, modify, and distribute this software and +its documentation for any purpose and without fee is hereby +granted, provided that the above copyright notice appears in all +copies and that both the copyright notice and this permission notice +appear in supporting documentation, and that the name of Intel +not be used in advertising or publicity pertaining to distribution +of the software without specific, written prior permission. + +INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE +INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, +IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR +CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM +LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, +NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION +WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +/* Segment Descriptor + * + * 31 24 19 16 7 0 + * ------------------------------------------------------------ + * | | |B| |A| | | |1|0|E|W|A| | + * | BASE 31..24 |G|/|0|V| LIMIT |P|DPL| TYPE | BASE 23:16 | + * | | |D| |L| 19..16| | |1|1|C|R|A| | + * ------------------------------------------------------------ + * | | | + * | BASE 15..0 | LIMIT 15..0 | + * | | | + * ------------------------------------------------------------ + */ + +struct seg_desc { + unsigned short limit_15_0; + unsigned short base_15_0; + unsigned char base_23_16; + unsigned char p_dpl_type; + unsigned char g_b_a_limit; + unsigned char base_31_24; + }; + +#define RUN 0 /* not really 0, but filled in at boot time */ + +struct seg_desc Gdt[] = { + {0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* 0x0 : null */ + {0xFFFF, 0x0, 0x0, 0x9F, 0xCF, 0x0}, /* 0x08 : kernel code */ + /* 0x9E? */ + {0xFFFF, 0x0, 0x0, 0x93, 0xCF, 0x0}, /* 0x10 : kernel data */ + /* 0x92? */ + {0xFFFF, RUN, RUN, 0x9E, 0x40, 0x0}, /* 0x18 : boot code */ + {0xFFFF, RUN, RUN, 0x92, 0x40, 0x0}, /* 0x20 : boot data */ + {0xFFFF, RUN, RUN, 0x9E, 0x0, 0x0}, /* 0x28 : boot code, 16 bits */ + /* More for bdb. */ + {}, /* BIOS_CS_INDEX = 6 : null */ + {}, /* BIOS_TMP_INDEX = 7 : null */ + {}, /* TSS_INDEX = 8 : null */ + {0xFFFF, 0x0, 0x0, 0xB2, 0x40, 0x0}, /* DS_286_INDEX = 9 */ + {0xFFFF, 0x0, 0x0, 0xB2, 0x40, 0x0}, /* ES_286_INDEX = 10 */ + {}, /* Unused = 11 : null */ + {0x7FFF, 0x8000, 0xB, 0xB2, 0x40, 0x0}, /* COLOR_INDEX = 12 */ + {0x7FFF, 0x0, 0xB, 0xB2, 0x40, 0x0}, /* MONO_INDEX = 13 */ + {0xFFFF, RUN, RUN, 0x9A, 0x40, 0x0}, /* DB_CS_INDEX = 14 */ + {0xFFFF, RUN, RUN, 0x9A, 0x0, 0x0}, /* DB_CS16_INDEX = 15 */ + {0xFFFF, RUN, RUN, 0x92, 0x40, 0x0}, /* DB_DS_INDEX = 16 */ + {8*18-1, RUN, RUN, 0x92, 0x40, 0x0}, /* GDT_INDEX = 17 */ +}; + +struct idt_desc { + unsigned short entry_15_0; + unsigned short selector; + unsigned char padding; + unsigned char p_dpl_type; + unsigned short entry_31_16; +}; + +struct idt_desc Idt[] = { + {}, /* Null (int 0) */ + {RUN, 0x70, 0, 0x8E, 0}, /* DEBUG_VECTOR = 1 */ + {}, /* Null (int 2) */ + {RUN, 0x70, 0, 0xEE, 0}, /* BREAKPOINT_VECTOR = 3 */ +}; + +struct pseudo_desc { + unsigned short limit; + unsigned short base_low; + unsigned short base_high; + }; + +struct pseudo_desc Gdtr = { sizeof Gdt - 1, RUN, RUN }; +struct pseudo_desc Idtr_prot = { sizeof Idt - 1, RUN, RUN }; +struct pseudo_desc Idtr_real = { 0x400 - 1, 0x0, 0x0 }; |
