3d96cedc35
providing compiled-in static environment data that is used instead of any data passed in from a boot loader. Previously 'env' worked only on i386 and arm xscale systems, because it required the MD startup code to examine the global envmode variable and decide whether to use static_env or an environment obtained from the boot loader, and set the global kern_envp accordingly. Most startup code wasn't doing so. Making things even more complex, some mips startup code uses an alternate scheme that involves calling init_static_kenv() to pass an empty buffer and its size, then uses a series of kern_setenv() calls to populate that buffer. Now all MD startup code calls init_static_kenv(), and that routine provides a single point where envmode is checked and the decision is made whether to use the compiled-in static_kenv or the values provided by the MD code. The routine also continues to serve its original purpose for mips; if a non-zero buffer size is passed the routine installs the empty buffer ready to accept kern_setenv() values. Now if the size is zero, the provided buffer full of existing env data is installed. A NULL pointer can be passed if the boot loader provides no env data; this allows the static env to be installed if envmode is set to do so. Most of the work here is a near-mechanical change to call the init function instead of directly setting kern_envp. A notable exception is in xen/pv.c; that code was originally installing a buffer full of preformatted env data along with its non-zero size (like mips code does), which would have allowed kern_setenv() calls to wipe out the preformatted data. Now it passes a zero for the size so that the buffer of data it installs is treated as non-writeable.
318 lines
8.0 KiB
C
318 lines
8.0 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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#ifdef FDT
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struct mem_region mr[FDT_MEM_REGIONS];
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int mr_cnt, val;
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int j;
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#endif
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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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#ifdef FDT
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if (fdt_get_mem_regions(mr, &mr_cnt, &val) == 0) {
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physmem = btoc(val);
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KASSERT((phys_avail[0] >= mr[0].mr_start) && \
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(phys_avail[0] < (mr[0].mr_start + mr[0].mr_size)),
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("First region is not within FDT memory range"));
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/* Limit size of the first region */
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phys_avail[1] = (mr[0].mr_start + MIN(mr[0].mr_size, ctob(realmem)));
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dump_avail[1] = phys_avail[1];
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/* Add the rest of regions */
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for (i = 1, j = 2; i < mr_cnt; i++, j+=2) {
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phys_avail[j] = mr[i].mr_start;
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phys_avail[j+1] = (mr[i].mr_start + mr[i].mr_size);
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dump_avail[j] = phys_avail[j];
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dump_avail[j+1] = phys_avail[j+1];
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}
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}
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#endif
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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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#ifdef FDT
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/* Parse cmd line args as env - copied from xlp_machdep. */
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/* XXX-BZ this should really be centrally provided for all (boot) code. */
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static void
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_parse_bootargs(char *cmdline)
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{
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char *n, *v;
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while ((v = strsep(&cmdline, " \n")) != NULL) {
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if (*v == '\0')
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continue;
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if (*v == '-') {
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while (*v != '\0') {
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v++;
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switch (*v) {
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case 'a': boothowto |= RB_ASKNAME; break;
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/* Someone should simulate that ;-) */
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case 'C': boothowto |= RB_CDROM; break;
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case 'd': boothowto |= RB_KDB; break;
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case 'D': boothowto |= RB_MULTIPLE; break;
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case 'm': boothowto |= RB_MUTE; break;
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case 'g': boothowto |= RB_GDB; break;
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case 'h': boothowto |= RB_SERIAL; break;
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case 'p': boothowto |= RB_PAUSE; break;
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case 'r': boothowto |= RB_DFLTROOT; break;
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case 's': boothowto |= RB_SINGLE; break;
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case 'v': boothowto |= RB_VERBOSE; break;
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}
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}
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} else {
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n = strsep(&v, "=");
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if (v == NULL)
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kern_setenv(n, "1");
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else
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kern_setenv(n, v);
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}
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}
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}
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#endif
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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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char buf[2048]; /* early stack supposedly big enough */
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vm_offset_t dtbp;
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phandle_t chosen;
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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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dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
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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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/*
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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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init_static_kenv(MD_FETCH(kmdp, MODINFOMD_ENVP, char *), 0);
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/*
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* Get bootargs from FDT if specified.
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*/
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chosen = OF_finddevice("/chosen");
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if (OF_getprop(chosen, "bootargs", buf, sizeof(buf)) != -1)
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_parse_bootargs(buf);
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#endif
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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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