f7d2df2a8a
In locore, we must detect and handle different arguments passed by loader(8) compared to what we recieve when booting directly via SBI firmware. Currently we receive the hart ID in a0 and a pointer to the device tree blob in a1. loader(8) provides only a pointer to its metadata in a0. The solution to this is to add an additional entry point, _alt_start. This will be placed first in the .text section, so SBI firmware will enter here, and jump to the common pagetable setup shortly after. Since loader(8) understands our ELF kernel, it will enter at the ELF's entry address, which points to _start. This approach leads to very little guesswork as to which way we booted. Fix-up initriscv() to parse the loader's metadata, continuing to use fake_preload_metadata() in the SBI direct boot case. Reviewed by: markj, jrtc27 (asm portion) Differential Revision: https://reviews.freebsd.org/D24912
55 lines
2.3 KiB
C
55 lines
2.3 KiB
C
/*-
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* Copyright (c) 2015-2017 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* Portions of this software were developed by SRI International and the
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* University of Cambridge Computer Laboratory under DARPA/AFRL contract
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* FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Portions of this software were developed by the University of Cambridge
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* Computer Laboratory as part of the CTSRD Project, with support from the
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* UK Higher Education Innovation Fund (HEIF).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_MACHDEP_H_
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#define _MACHINE_MACHDEP_H_
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struct riscv_bootparams {
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vm_offset_t kern_l1pt; /* Kernel L1 base */
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vm_offset_t kern_phys; /* Kernel base (physical) addr */
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vm_offset_t kern_stack;
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vm_offset_t dtbp_virt; /* Device tree blob virtual addr */
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vm_offset_t dtbp_phys; /* Device tree blob physical addr */
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vm_offset_t modulep; /* loader(8) metadata */
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};
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extern vm_paddr_t physmap[PHYS_AVAIL_ENTRIES];
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extern u_int physmap_idx;
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void initriscv(struct riscv_bootparams *);
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#endif /* _MACHINE_MACHDEP_H_ */
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