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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Kernel/Debugger Interface (KDI) routines. Called during debugger under
* various system states (boot, while running, while the debugger has control).
* Functions intended for use while the debugger has control may not grab any
* locks or perform any functions that assume the availability of other system
* services.
*/
#include <sys/systm.h>
#include <sys/x86_archext.h>
#include <sys/kdi_impl.h>
#include <sys/smp_impldefs.h>
#include <sys/psm_types.h>
#include <sys/segments.h>
#include <sys/archsystm.h>
#include <sys/controlregs.h>
#include <sys/trap.h>
#include <sys/kobj.h>
#include <sys/kobj_impl.h>
#include <sys/hypervisor.h>
#include <sys/bootconf.h>
#include <sys/bootinfo.h>
#include <sys/promif.h>
#include <sys/evtchn_impl.h>
#include <sys/cpu.h>
#include <vm/kboot_mmu.h>
#include <vm/hat_pte.h>
static volatile int kdi_slaves_go;
/*
* These are not safe against dropping into kmdb when fbt::: is active. This is
* also broken on i86pc...
*/
void
kdi_idtr_write(desctbr_t *idtr)
{
gate_desc_t *idt = (gate_desc_t *)idtr->dtr_base;
uint_t nidt = (idtr->dtr_limit + 1) / sizeof (*idt);
uint_t vec;
for (vec = 0; vec < nidt; vec++, idt++)
xen_idt_write(idt, vec);
}
void
kdi_idt_write(gate_desc_t *gate, uint_t vec)
{
gate_desc_t *idt = CPU->cpu_m.mcpu_idt;
/*
* See kdi_idtr_set().
*/
if (idt != NULL)
idt[vec] = *gate;
xen_idt_write(gate, vec);
}
ulong_t
kdi_dreg_get(int reg)
{
return (__hypercall1(__HYPERVISOR_get_debugreg, (long)reg));
}
void
kdi_dreg_set(int reg, ulong_t value)
{
(void) __hypercall2(__HYPERVISOR_set_debugreg, (long)reg, value);
}
void
kdi_flush_caches(void)
{
}
/*
* To avoid domains sucking up CPU while sitting in kmdb, we make all the slave
* CPUs wait for a wake-up evtchn. The master CPU, meanwhile, sleeps for
* console activity.
*/
extern void kdi_slave_entry(void);
void
kdi_stop_slaves(int cpu, int doxc)
{
if (doxc)
kdi_xc_others(cpu, kdi_slave_entry);
kdi_slaves_go = 0;
}
void
kdi_start_slaves(void)
{
int c;
kdi_slaves_go = 1;
for (c = 0; c < NCPU; c++) {
if (cpu[c] == NULL || !(cpu[c]->cpu_flags & CPU_READY))
continue;
ec_try_ipi(XC_CPUPOKE_PIL, c);
}
}
/*ARGSUSED*/
static int
check_slave(void *arg)
{
return (kdi_slaves_go == 1);
}
void
kdi_slave_wait(void)
{
if (!(cpu[CPU->cpu_id]->cpu_flags & CPU_READY))
return;
ec_wait_on_ipi(XC_CPUPOKE_PIL, check_slave, NULL);
}
/*
* Caution.
* These routines are called -extremely- early, during kmdb initialization.
*
* Many common kernel functions assume that %gs has been initialized,
* and fail horribly if it hasn't. At this point, the boot code has
* reserved a descriptor for us (KMDBGS_SEL) in it's GDT; arrange for it
* to point at a dummy cpu_t, temporarily at least.
*
* Note that kmdb entry relies on the fake cpu_t having zero cpu_idt/cpu_id.
*/
#if defined(__amd64)
void *
boot_kdi_tmpinit(void)
{
cpu_t *cpu = kobj_zalloc(sizeof (*cpu), KM_TMP);
user_desc_t *bgdt;
uint64_t gdtpa;
ulong_t ma[1];
cpu->cpu_self = cpu;
/*
* (Note that we had better switch to a -new- GDT before
* we discard the KM_TMP mappings, or disaster will ensue.)
*/
bgdt = kobj_zalloc(PAGESIZE, KM_TMP);
ASSERT(((uintptr_t)bgdt & PAGEOFFSET) == 0);
init_boot_gdt(bgdt);
gdtpa = pfn_to_pa(va_to_pfn(bgdt));
ma[0] = (ulong_t)(pa_to_ma(gdtpa) >> PAGESHIFT);
kbm_read_only((uintptr_t)bgdt, gdtpa);
if (HYPERVISOR_set_gdt(ma, PAGESIZE / sizeof (user_desc_t)))
panic("boot_kdi_tmpinit:HYPERVISOR_set_gdt() failed");
load_segment_registers(B64CODE_SEL, 0, 0, B32DATA_SEL);
/*
* Now point %gsbase to our temp cpu structure.
*/
xen_set_segment_base(SEGBASE_GS_KERNEL, (ulong_t)cpu);
return (0);
}
/*ARGSUSED*/
void
boot_kdi_tmpfini(void *old)
{
/*
* This breaks, why do we need it anyway?
*/
#if 0 /* XXPV */
load_segment_registers(B64CODE_SEL, 0, KMDBGS_SEL, B32DATA_SEL);
#endif
}
#elif defined(__i386)
/*
* Sigh. We're called before we've initialized the kernels GDT, living
* off the hypervisor's default GDT. For kmdb's sake, we switch now to
* a GDT that looks like dboot's GDT; very shortly we'll initialize and
* switch to the kernel's GDT.
*/
void *
boot_kdi_tmpinit(void)
{
cpu_t *cpu = kobj_zalloc(sizeof (*cpu), KM_TMP);
user_desc_t *bgdt;
uint64_t gdtpa;
ulong_t ma[1];
cpu->cpu_self = cpu;
/*
* (Note that we had better switch to a -new- GDT before
* we discard the KM_TMP mappings, or disaster will ensue.)
*/
bgdt = kobj_zalloc(PAGESIZE, KM_TMP);
ASSERT(((uintptr_t)bgdt & PAGEOFFSET) == 0);
gdtpa = pfn_to_pa(va_to_pfn(bgdt));
init_boot_gdt(bgdt);
set_usegd(&bgdt[GDT_BGSTMP],
cpu, sizeof (*cpu), SDT_MEMRWA, SEL_KPL, SDP_BYTES, SDP_OP32);
ma[0] = (ulong_t)(pa_to_ma(gdtpa) >> PAGESHIFT);
kbm_read_only((uintptr_t)bgdt, gdtpa);
if (HYPERVISOR_set_gdt(ma, PAGESIZE / sizeof (user_desc_t)))
panic("boot_kdi_tmpinit:HYPERVISOR_set_gdt() failed");
load_segment_registers(B32CODE_SEL, B32DATA_SEL, B32DATA_SEL, 0,
KMDBGS_SEL, B32DATA_SEL);
return (0);
}
/*ARGSUSED*/
void
boot_kdi_tmpfini(void *old)
{
load_segment_registers(B32CODE_SEL, B32DATA_SEL, B32DATA_SEL, 0,
0, B32DATA_SEL);
}
#endif /* __i386 */
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