intel/os/arch_kdi.c

ae115bc77f6fcde83175c75b4206dc2e50747966mrj/*
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * CDDL HEADER START
ae115bc77f6fcde83175c75b4206dc2e50747966mrj *
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * The contents of this file are subject to the terms of the
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * Common Development and Distribution License (the "License").
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * You may not use this file except in compliance with the License.
ae115bc77f6fcde83175c75b4206dc2e50747966mrj *
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * or http://www.opensolaris.org/os/licensing.
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * See the License for the specific language governing permissions
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * and limitations under the License.
ae115bc77f6fcde83175c75b4206dc2e50747966mrj *
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * When distributing Covered Code, include this CDDL HEADER in each
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * If applicable, add the following below this CDDL HEADER, with the
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * fields enclosed by brackets "[]" replaced with your own identifying
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * information: Portions Copyright [yyyy] [name of copyright owner]
ae115bc77f6fcde83175c75b4206dc2e50747966mrj *
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * CDDL HEADER END
ae115bc77f6fcde83175c75b4206dc2e50747966mrj */
ae115bc77f6fcde83175c75b4206dc2e50747966mrj/*
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * Use is subject to license terms.
ae115bc77f6fcde83175c75b4206dc2e50747966mrj */
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj/*
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * Kernel/Debugger Interface (KDI) routines.  Called during debugger under
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * various system states (boot, while running, while the debugger has control).
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * Functions intended for use while the debugger has control may not grab any
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * locks or perform any functions that assume the availability of other system
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * services.
ae115bc77f6fcde83175c75b4206dc2e50747966mrj */
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#include <sys/systm.h>
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#include <sys/x86_archext.h>
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#include <sys/kdi_impl.h>
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#include <sys/smp_impldefs.h>
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#include <sys/psm_types.h>
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#include <sys/segments.h>
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#include <sys/archsystm.h>
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#include <sys/controlregs.h>
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#include <sys/trap.h>
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#include <sys/kobj.h>
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#include <sys/kobj_impl.h>
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni#include <sys/clock_impl.h>
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrjstatic void
ae115bc77f6fcde83175c75b4206dc2e50747966mrjkdi_system_claim(void)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj{
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni    lbolt_debug_entry();
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    psm_notifyf(PSM_DEBUG_ENTER);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj}
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrjstatic void
ae115bc77f6fcde83175c75b4206dc2e50747966mrjkdi_system_release(void)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj{
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    psm_notifyf(PSM_DEBUG_EXIT);
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni    lbolt_debug_return();
ae115bc77f6fcde83175c75b4206dc2e50747966mrj}
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrjstatic cpu_t *
ae115bc77f6fcde83175c75b4206dc2e50747966mrjkdi_gdt2cpu(uintptr_t gdtbase)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj{
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    cpu_t *cp = cpu_list;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    if (cp == NULL)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj        return (NULL);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    do {
ae115bc77f6fcde83175c75b4206dc2e50747966mrj        if (gdtbase == (uintptr_t)cp->cpu_gdt)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj            return (cp);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    } while ((cp = cp->cpu_next) != cpu_list);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    return (NULL);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj}
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#if defined(__amd64)
ae115bc77f6fcde83175c75b4206dc2e50747966mrjuintptr_t
ae115bc77f6fcde83175c75b4206dc2e50747966mrjkdi_gdt2gsbase(uintptr_t gdtbase)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj{
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    return ((uintptr_t)kdi_gdt2cpu(gdtbase));
ae115bc77f6fcde83175c75b4206dc2e50747966mrj}
ae115bc77f6fcde83175c75b4206dc2e50747966mrj#endif
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrjstatic uintptr_t
ae115bc77f6fcde83175c75b4206dc2e50747966mrjkdi_get_userlimit(void)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj{
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    return (_userlimit);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj}
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrjstatic int
ae115bc77f6fcde83175c75b4206dc2e50747966mrjkdi_get_cpuinfo(uint_t *vendorp, uint_t *familyp, uint_t *modelp)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj{
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    desctbr_t gdtr;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    cpu_t *cpu;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    /*
ae115bc77f6fcde83175c75b4206dc2e50747966mrj     * CPU doesn't work until the GDT and gs/GSBASE have been set up.
ae115bc77f6fcde83175c75b4206dc2e50747966mrj     * Boot-loaded kmdb will call us well before then, so we have to
ae115bc77f6fcde83175c75b4206dc2e50747966mrj     * find the current cpu_t the hard way.
ae115bc77f6fcde83175c75b4206dc2e50747966mrj     */
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    rd_gdtr(&gdtr);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    if ((cpu = kdi_gdt2cpu(gdtr.dtr_base)) == NULL ||
ae115bc77f6fcde83175c75b4206dc2e50747966mrj        !cpuid_checkpass(cpu, 1))
ae115bc77f6fcde83175c75b4206dc2e50747966mrj        return (EAGAIN); /* cpuid isn't done yet */
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    *vendorp = cpuid_getvendor(cpu);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    *familyp = cpuid_getfamily(cpu);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    *modelp = cpuid_getmodel(cpu);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    return (0);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj}
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrjvoid
ae115bc77f6fcde83175c75b4206dc2e50747966mrjkdi_idtr_set(gate_desc_t *idt, size_t limit)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj{
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    desctbr_t idtr;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    /*
ae115bc77f6fcde83175c75b4206dc2e50747966mrj     * This rare case could happen if we entered kmdb whilst still on the
ae115bc77f6fcde83175c75b4206dc2e50747966mrj     * fake CPU set up by boot_kdi_tmpinit().  We're trying to restore the
ae115bc77f6fcde83175c75b4206dc2e50747966mrj     * kernel's IDT that we saved on entry, but it was from the fake cpu_t
ae115bc77f6fcde83175c75b4206dc2e50747966mrj     * rather than the real IDT (which is still boot's).  It's unpleasant,
ae115bc77f6fcde83175c75b4206dc2e50747966mrj     * but we just encode knowledge that it's idt0 we want to restore.
ae115bc77f6fcde83175c75b4206dc2e50747966mrj     */
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    if (idt == NULL)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj        idt = idt0;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    CPU->cpu_m.mcpu_idt = idt;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    idtr.dtr_base = (uintptr_t)idt;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    idtr.dtr_limit = limit;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi_idtr_write(&idtr);
ae115bc77f6fcde83175c75b4206dc2e50747966mrj}
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrjstatic void
ae115bc77f6fcde83175c75b4206dc2e50747966mrjkdi_plat_call(void (*platfn)(void))
ae115bc77f6fcde83175c75b4206dc2e50747966mrj{
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    if (platfn != NULL)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj        platfn();
ae115bc77f6fcde83175c75b4206dc2e50747966mrj}
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrj/*
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * On Intel, most of these are shared between i86*, so this is really an
ae115bc77f6fcde83175c75b4206dc2e50747966mrj * arch_kdi_init().
ae115bc77f6fcde83175c75b4206dc2e50747966mrj */
ae115bc77f6fcde83175c75b4206dc2e50747966mrjvoid
ae115bc77f6fcde83175c75b4206dc2e50747966mrjmach_kdi_init(kdi_t *kdi)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj{
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->kdi_plat_call = kdi_plat_call;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->kdi_kmdb_enter = kmdb_enter;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_activate = kdi_activate;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_deactivate = kdi_deactivate;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_idt_switch = kdi_idt_switch;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_update_drreg = kdi_update_drreg;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_set_debug_msrs = kdi_set_debug_msrs;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_get_userlimit = kdi_get_userlimit;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_get_cpuinfo = kdi_get_cpuinfo;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_stop_slaves = kdi_stop_slaves;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_start_slaves = kdi_start_slaves;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_slave_wait = kdi_slave_wait;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_memrange_add = kdi_memrange_add;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->mkdi_reboot = kdi_reboot;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj}
ae115bc77f6fcde83175c75b4206dc2e50747966mrj
ae115bc77f6fcde83175c75b4206dc2e50747966mrjvoid
ae115bc77f6fcde83175c75b4206dc2e50747966mrjplat_kdi_init(kdi_t *kdi)
ae115bc77f6fcde83175c75b4206dc2e50747966mrj{
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->pkdi_system_claim = kdi_system_claim;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj    kdi->pkdi_system_release = kdi_system_release;
ae115bc77f6fcde83175c75b4206dc2e50747966mrj}