7b54e1ca53
The HCDP table is one (non-proprietary) way for the platform to inform the OS about headless operation. This field would normally hold the address as can be found by scanning the EFI system table, which we also pass to the kernel. The apparent duplication allows us to synthesize a HCDP table in the loader by whatever means we can think of, including relocating the platform table into pre- mapped address space. In short: it gives us more freedom. Approved by: re (blanket)
66 lines
2.5 KiB
C
66 lines
2.5 KiB
C
/* $FreeBSD$ */
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/*
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* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* The boot program passes a pointer (in the boot environment virtual
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* address address space; "BEVA") to a bootinfo to the kernel using
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* the following convention:
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*
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* a0 contains first free page frame number
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* a1 contains page number of current level 1 page table
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* if a2 contains BOOTINFO_MAGIC and a4 is nonzero:
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* a3 contains pointer (BEVA) to bootinfo
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* a4 contains bootinfo version number
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* if a2 contains BOOTINFO_MAGIC and a4 contains 0 (backward compat):
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* a3 contains pointer (BEVA) to bootinfo version
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* (u_long), then the bootinfo
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*/
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#define BOOTINFO_MAGIC 0xdeadbeeffeedface
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struct bootinfo {
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u_int64_t bi_magic; /* BOOTINFO_MAGIC */
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u_int64_t bi_version; /* version 1 */
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u_int64_t bi_spare[6]; /* was: name of booted kernel */
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u_int64_t bi_hcdp; /* DIG64 HCDP table */
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u_int64_t bi_fpswa; /* FPSWA interface */
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u_int64_t bi_boothowto; /* value for boothowto */
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u_int64_t bi_systab; /* pa of EFI system table */
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u_int64_t bi_memmap; /* pa of EFI memory map */
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u_int64_t bi_memmap_size; /* size of EFI memory map */
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u_int64_t bi_memdesc_size; /* sizeof EFI memory desc */
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u_int32_t bi_memdesc_version; /* EFI memory desc version */
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u_int64_t bi_symtab; /* start of kernel sym table */
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u_int64_t bi_esymtab; /* end of kernel sym table */
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u_int64_t bi_kernend; /* end of kernel space */
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u_int64_t bi_envp; /* environment */
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u_int64_t bi_modulep; /* preloaded modules */
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};
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extern struct bootinfo bootinfo;
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