7b8b2892d4
commit 003649d9622ce252a2794ae5891ee7e7c209caca
Author: Robert N. M. Watson <robert.watson@cl.cam.ac.uk>
Date: Wed Feb 5 18:32:09 2014 +0000
Teach the FreeBSD/beri boot to "auto-detect" whether argument 4 (a3) is a
memory size of pointer to a struct bootinfo * by looking at its value and
seeing whether it is pointer-like. If a pointer, assume it's a bootinfo
and extract memsize from it instead; otherwise, use it as memsize directly.
This allows kernels to support bootinfo being passed by loader (and boot2)
while still supporting older Miniboot setups.
commit f7045af9a1e92b6bd92541fe5d25abf66d824e8f
Author: Robert N. M. Watson <robert.watson@cl.cam.ac.uk>
Date: Thu Feb 6 13:45:34 2014 +0000
When the module metadata pointer is available from loader, use it in the
kernel.
commit 52e0e1ff2cba9dfcfab9e1d0a31fb7fdf7317450
Author: Robert N. M. Watson <robert.watson@cl.cam.ac.uk>
Date: Thu Feb 6 19:57:48 2014 +0000
In the BERI kernel boot code, extract 'boothowto' (which includes boot flags
such as '-s') and 'envp' from passed module data. Booting to single-user
mode using boot flags now works.
Sponsored by: DARPA, AFRL
244 lines
6.1 KiB
C
244 lines
6.1 KiB
C
/*-
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* Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
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* Copyright (c) 2012-2014 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/imgact.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/bus.h>
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#include <sys/cpu.h>
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#include <sys/cons.h>
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#include <sys/exec.h>
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#include <sys/linker.h>
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#include <sys/ucontext.h>
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#include <sys/proc.h>
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#include <sys/kdb.h>
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#include <sys/ptrace.h>
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#include <sys/reboot.h>
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#include <sys/signalvar.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <sys/user.h>
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#ifdef FDT
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#endif
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <machine/bootinfo.h>
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#include <machine/clock.h>
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#include <machine/cpu.h>
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#include <machine/cpuregs.h>
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#include <machine/hwfunc.h>
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#include <machine/md_var.h>
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#include <machine/metadata.h>
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#include <machine/pmap.h>
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#include <machine/trap.h>
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extern int *edata;
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extern int *end;
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void
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platform_cpu_init()
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{
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/* Nothing special */
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}
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static void
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mips_init(void)
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{
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int i;
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for (i = 0; i < 10; i++) {
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phys_avail[i] = 0;
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}
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/* phys_avail regions are in bytes */
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phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
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phys_avail[1] = ctob(realmem);
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dump_avail[0] = phys_avail[0];
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dump_avail[1] = phys_avail[1];
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physmem = realmem;
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init_param1();
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init_param2(physmem);
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mips_cpu_init();
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pmap_bootstrap();
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mips_proc0_init();
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mutex_init();
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kdb_init();
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#ifdef KDB
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if (boothowto & RB_KDB)
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kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
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#endif
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}
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/*
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* Perform a board-level soft-reset.
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*/
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void
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platform_reset(void)
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{
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/* XXX SMP will likely require us to do more. */
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__asm__ __volatile__(
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"mfc0 $k0, $12\n\t"
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"li $k1, 0x00100000\n\t"
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"or $k0, $k0, $k1\n\t"
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"mtc0 $k0, $12\n");
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for( ; ; )
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__asm__ __volatile("wait");
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}
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void
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platform_start(__register_t a0, __register_t a1, __register_t a2,
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__register_t a3)
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{
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struct bootinfo *bootinfop;
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vm_offset_t kernend;
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uint64_t platform_counter_freq;
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int argc = a0;
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char **argv = (char **)a1;
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char **envp = (char **)a2;
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long memsize;
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#ifdef FDT
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vm_offset_t dtbp;
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void *kmdp;
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#endif
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int i;
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/* clear the BSS and SBSS segments */
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kernend = (vm_offset_t)&end;
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memset(&edata, 0, kernend - (vm_offset_t)(&edata));
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mips_postboot_fixup();
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mips_pcpu0_init();
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/*
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* Over time, we've changed out boot-time binary interface for the
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* kernel. Miniboot simply provides a 'memsize' in a3, whereas the
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* FreeBSD boot loader provides a 'bootinfo *' in a3. While slightly
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* grody, we support both here by detecting 'pointer-like' values in
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* a3 and assuming physical memory can never be that back.
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*
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* XXXRW: Pull more values than memsize out of bootinfop -- e.g.,
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* module information.
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*/
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if (a3 >= 0x9800000000000000ULL) {
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bootinfop = (void *)a3;
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memsize = bootinfop->bi_memsize;
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preload_metadata = (caddr_t)bootinfop->bi_modulep;
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} else {
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bootinfop = NULL;
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memsize = a3;
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}
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#ifdef FDT
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/*
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* Find the dtb passed in by the boot loader (currently fictional).
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*/
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kmdp = preload_search_by_type("elf kernel");
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if (kmdp != NULL)
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dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
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else
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dtbp = (vm_offset_t)NULL;
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#if defined(FDT_DTB_STATIC)
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/*
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* In case the device tree blob was not retrieved (from metadata) try
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* to use the statically embedded one.
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*/
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if (dtbp == (vm_offset_t)NULL)
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dtbp = (vm_offset_t)&fdt_static_dtb;
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#else
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#error "Non-static FDT not yet supported on BERI"
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#endif
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if (OF_install(OFW_FDT, 0) == FALSE)
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while (1);
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if (OF_init((void *)dtbp) != 0)
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while (1);
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#endif
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/*
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* Configure more boot-time parameters passed in by loader.
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*/
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boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
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kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
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/*
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* XXXRW: We have no way to compare wallclock time to cycle rate on
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* BERI, so for now assume we run at the MALTA default (100MHz).
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*/
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platform_counter_freq = MIPS_DEFAULT_HZ;
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mips_timer_early_init(platform_counter_freq);
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cninit();
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printf("entry: platform_start()\n");
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bootverbose = 1;
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if (bootverbose) {
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printf("cmd line: ");
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for (i = 0; i < argc; i++)
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printf("%s ", argv[i]);
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printf("\n");
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printf("envp:\n");
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for (i = 0; envp[i]; i += 2)
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printf("\t%s = %s\n", envp[i], envp[i+1]);
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if (bootinfop != NULL)
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printf("bootinfo found at %p\n", bootinfop);
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printf("memsize = %p\n", (void *)memsize);
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}
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realmem = btoc(memsize);
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mips_init();
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mips_timer_init_params(platform_counter_freq, 0);
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}
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