040f3ac494
The value returned by kern_getenv should be freed using freeenv. Reported by: Coverity CID: 1248852 Sponsored by: Citrix Systems R&D
413 lines
11 KiB
C
413 lines
11 KiB
C
/*
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* Copyright (c) 2004 Christian Limpach.
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* Copyright (c) 2004-2006,2008 Kip Macy
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* Copyright (c) 2013 Roger Pau Monné <roger.pau@citrix.com>
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* All rights reserved.
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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 <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/reboot.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/linker.h>
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#include <sys/lock.h>
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#include <sys/rwlock.h>
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#include <sys/boot.h>
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#include <sys/ctype.h>
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#include <sys/mutex.h>
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#include <sys/smp.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_page.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_param.h>
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#include <machine/intr_machdep.h>
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#include <x86/apicvar.h>
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#include <x86/init.h>
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#include <machine/pc/bios.h>
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#include <machine/smp.h>
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#include <machine/intr_machdep.h>
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#include <xen/xen-os.h>
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#include <xen/hypervisor.h>
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#include <xen/xenstore/xenstorevar.h>
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#include <xen/xen_pv.h>
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#include <xen/xen_msi.h>
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#include <xen/interface/vcpu.h>
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#include <dev/xen/timer/timer.h>
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#ifdef DDB
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#include <ddb/ddb.h>
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#endif
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/* Native initial function */
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extern u_int64_t hammer_time(u_int64_t, u_int64_t);
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/* Xen initial function */
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uint64_t hammer_time_xen(start_info_t *, uint64_t);
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#define MAX_E820_ENTRIES 128
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/*--------------------------- Forward Declarations ---------------------------*/
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static caddr_t xen_pv_parse_preload_data(u_int64_t);
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static void xen_pv_parse_memmap(caddr_t, vm_paddr_t *, int *);
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#ifdef SMP
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static int xen_pv_start_all_aps(void);
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#endif
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/*---------------------------- Extern Declarations ---------------------------*/
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#ifdef SMP
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/* Variables used by amd64 mp_machdep to start APs */
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extern struct mtx ap_boot_mtx;
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extern void *bootstacks[];
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extern char *doublefault_stack;
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extern char *nmi_stack;
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extern void *dpcpu;
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extern int bootAP;
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extern char *bootSTK;
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#endif
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/*
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* Placed by the linker at the end of the bss section, which is the last
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* section loaded by Xen before loading the symtab and strtab.
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*/
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extern uint32_t end;
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/*-------------------------------- Global Data -------------------------------*/
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/* Xen init_ops implementation. */
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struct init_ops xen_init_ops = {
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.parse_preload_data = xen_pv_parse_preload_data,
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.early_clock_source_init = xen_clock_init,
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.early_delay = xen_delay,
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.parse_memmap = xen_pv_parse_memmap,
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#ifdef SMP
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.start_all_aps = xen_pv_start_all_aps,
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#endif
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.msi_init = xen_msi_init,
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};
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static struct bios_smap xen_smap[MAX_E820_ENTRIES];
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/*-------------------------------- Xen PV init -------------------------------*/
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/*
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* First function called by the Xen PVH boot sequence.
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*
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* Set some Xen global variables and prepare the environment so it is
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* as similar as possible to what native FreeBSD init function expects.
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*/
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uint64_t
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hammer_time_xen(start_info_t *si, uint64_t xenstack)
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{
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uint64_t physfree;
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uint64_t *PT4 = (u_int64_t *)xenstack;
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uint64_t *PT3 = (u_int64_t *)(xenstack + PAGE_SIZE);
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uint64_t *PT2 = (u_int64_t *)(xenstack + 2 * PAGE_SIZE);
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int i;
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xen_domain_type = XEN_PV_DOMAIN;
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vm_guest = VM_GUEST_XEN;
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if ((si == NULL) || (xenstack == 0)) {
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xc_printf("ERROR: invalid start_info or xen stack, halting\n");
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HYPERVISOR_shutdown(SHUTDOWN_crash);
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}
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xc_printf("FreeBSD PVH running on %s\n", si->magic);
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/* We use 3 pages of xen stack for the boot pagetables */
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physfree = xenstack + 3 * PAGE_SIZE - KERNBASE;
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/* Setup Xen global variables */
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HYPERVISOR_start_info = si;
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HYPERVISOR_shared_info =
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(shared_info_t *)(si->shared_info + KERNBASE);
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/*
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* Setup some misc global variables for Xen devices
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*
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* XXX: Devices that need these specific variables should
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* be rewritten to fetch this info by themselves from the
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* start_info page.
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*/
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xen_store = (struct xenstore_domain_interface *)
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(ptoa(si->store_mfn) + KERNBASE);
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console_page = (char *)(ptoa(si->console.domU.mfn) + KERNBASE);
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/*
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* Use the stack Xen gives us to build the page tables
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* as native FreeBSD expects to find them (created
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* by the boot trampoline).
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*/
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for (i = 0; i < (PAGE_SIZE / sizeof(uint64_t)); i++) {
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/*
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* Each slot of the level 4 pages points
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* to the same level 3 page
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*/
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PT4[i] = ((uint64_t)&PT3[0]) - KERNBASE;
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PT4[i] |= PG_V | PG_RW | PG_U;
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/*
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* Each slot of the level 3 pages points
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* to the same level 2 page
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*/
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PT3[i] = ((uint64_t)&PT2[0]) - KERNBASE;
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PT3[i] |= PG_V | PG_RW | PG_U;
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/*
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* The level 2 page slots are mapped with
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* 2MB pages for 1GB.
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*/
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PT2[i] = i * (2 * 1024 * 1024);
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PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
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}
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load_cr3(((uint64_t)&PT4[0]) - KERNBASE);
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/* Set the hooks for early functions that diverge from bare metal */
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init_ops = xen_init_ops;
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apic_ops = xen_apic_ops;
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/* Now we can jump into the native init function */
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return (hammer_time(0, physfree));
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}
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/*-------------------------------- PV specific -------------------------------*/
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#ifdef SMP
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static bool
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start_xen_ap(int cpu)
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{
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struct vcpu_guest_context *ctxt;
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int ms, cpus = mp_naps;
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const size_t stacksize = KSTACK_PAGES * PAGE_SIZE;
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/* allocate and set up an idle stack data page */
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bootstacks[cpu] =
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(void *)kmem_malloc(kernel_arena, stacksize, M_WAITOK | M_ZERO);
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doublefault_stack =
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(char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
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nmi_stack =
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(char *)kmem_malloc(kernel_arena, PAGE_SIZE, M_WAITOK | M_ZERO);
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dpcpu =
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(void *)kmem_malloc(kernel_arena, DPCPU_SIZE, M_WAITOK | M_ZERO);
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bootSTK = (char *)bootstacks[cpu] + KSTACK_PAGES * PAGE_SIZE - 8;
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bootAP = cpu;
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ctxt = malloc(sizeof(*ctxt), M_TEMP, M_WAITOK | M_ZERO);
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if (ctxt == NULL)
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panic("unable to allocate memory");
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ctxt->flags = VGCF_IN_KERNEL;
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ctxt->user_regs.rip = (unsigned long) init_secondary;
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ctxt->user_regs.rsp = (unsigned long) bootSTK;
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/* Set the AP to use the same page tables */
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ctxt->ctrlreg[3] = KPML4phys;
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if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
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panic("unable to initialize AP#%d", cpu);
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free(ctxt, M_TEMP);
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/* Launch the vCPU */
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if (HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL))
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panic("unable to start AP#%d", cpu);
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/* Wait up to 5 seconds for it to start. */
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for (ms = 0; ms < 5000; ms++) {
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if (mp_naps > cpus)
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return (true);
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DELAY(1000);
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}
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return (false);
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}
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static int
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xen_pv_start_all_aps(void)
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{
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int cpu;
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mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
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for (cpu = 1; cpu < mp_ncpus; cpu++) {
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/* attempt to start the Application Processor */
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if (!start_xen_ap(cpu))
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panic("AP #%d failed to start!", cpu);
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CPU_SET(cpu, &all_cpus); /* record AP in CPU map */
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}
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return (mp_naps);
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}
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#endif /* SMP */
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/*
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* Functions to convert the "extra" parameters passed by Xen
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* into FreeBSD boot options.
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*/
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static void
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xen_pv_set_env(void)
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{
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char *cmd_line_next, *cmd_line;
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size_t env_size;
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cmd_line = HYPERVISOR_start_info->cmd_line;
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env_size = sizeof(HYPERVISOR_start_info->cmd_line);
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/* Skip leading spaces */
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for (; isspace(*cmd_line) && (env_size != 0); cmd_line++)
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env_size--;
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/* Replace ',' with '\0' */
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for (cmd_line_next = cmd_line; strsep(&cmd_line_next, ",") != NULL;)
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;
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init_static_kenv(cmd_line, env_size);
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}
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static void
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xen_pv_set_boothowto(void)
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{
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int i;
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char *env;
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/* get equivalents from the environment */
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for (i = 0; howto_names[i].ev != NULL; i++) {
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if ((env = kern_getenv(howto_names[i].ev)) != NULL) {
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boothowto |= howto_names[i].mask;
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freeenv(env);
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}
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}
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}
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#ifdef DDB
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/*
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* The way Xen loads the symtab is different from the native boot loader,
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* because it's tailored for NetBSD. So we have to adapt and use the same
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* method as NetBSD. Portions of the code below have been picked from NetBSD:
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* sys/kern/kern_ksyms.c CVS Revision 1.71.
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*/
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static void
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xen_pv_parse_symtab(void)
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{
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Elf_Ehdr *ehdr;
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Elf_Shdr *shdr;
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vm_offset_t sym_end;
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uint32_t size;
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int i, j;
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size = end;
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sym_end = HYPERVISOR_start_info->mod_start != 0 ?
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HYPERVISOR_start_info->mod_start :
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HYPERVISOR_start_info->mfn_list;
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/*
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* Make sure the size is right headed, sym_end is just a
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* high boundary, but at least allows us to fail earlier.
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*/
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if ((vm_offset_t)&end + size > sym_end) {
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xc_printf("Unable to load ELF symtab: size mismatch\n");
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return;
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}
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ehdr = (Elf_Ehdr *)(&end + 1);
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if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) ||
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ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
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ehdr->e_version > 1) {
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xc_printf("Unable to load ELF symtab: invalid symbol table\n");
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return;
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}
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shdr = (Elf_Shdr *)((uint8_t *)ehdr + ehdr->e_shoff);
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/* Find the symbol table and the corresponding string table. */
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for (i = 1; i < ehdr->e_shnum; i++) {
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if (shdr[i].sh_type != SHT_SYMTAB)
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continue;
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if (shdr[i].sh_offset == 0)
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continue;
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ksymtab = (uintptr_t)((uint8_t *)ehdr + shdr[i].sh_offset);
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ksymtab_size = shdr[i].sh_size;
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j = shdr[i].sh_link;
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if (shdr[j].sh_offset == 0)
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continue; /* Can this happen? */
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kstrtab = (uintptr_t)((uint8_t *)ehdr + shdr[j].sh_offset);
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break;
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}
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if (ksymtab == 0 || kstrtab == 0) {
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xc_printf(
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"Unable to load ELF symtab: could not find symtab or strtab\n");
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return;
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}
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}
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#endif
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static caddr_t
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xen_pv_parse_preload_data(u_int64_t modulep)
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{
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/* Parse the extra boot information given by Xen */
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xen_pv_set_env();
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xen_pv_set_boothowto();
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#ifdef DDB
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xen_pv_parse_symtab();
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#endif
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return (NULL);
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}
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static void
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xen_pv_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx)
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{
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struct xen_memory_map memmap;
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u_int32_t size;
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int rc;
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/* Fetch the E820 map from Xen */
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memmap.nr_entries = MAX_E820_ENTRIES;
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set_xen_guest_handle(memmap.buffer, xen_smap);
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rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
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if (rc)
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panic("unable to fetch Xen E820 memory map");
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size = memmap.nr_entries * sizeof(xen_smap[0]);
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bios_add_smap_entries(xen_smap, size, physmap, physmap_idx);
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}
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