1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * Kernel/Debugger Interface (KDI) routines. Called during debugger under 28 * various system states (boot, while running, while the debugger has control). 29 * Functions intended for use while the debugger has control may not grab any 30 * locks or perform any functions that assume the availability of other system 31 * services. 32 */ 33 34 #include <sys/systm.h> 35 #include <sys/x86_archext.h> 36 #include <sys/kdi_impl.h> 37 #include <sys/smp_impldefs.h> 38 #include <sys/psm_types.h> 39 #include <sys/segments.h> 40 #include <sys/archsystm.h> 41 #include <sys/controlregs.h> 42 #include <sys/trap.h> 43 #include <sys/kobj.h> 44 #include <sys/kobj_impl.h> 45 #include <sys/clock_impl.h> 46 47 static void 48 kdi_system_claim(void) 49 { 50 lbolt_debug_entry(); 51 52 psm_notifyf(PSM_DEBUG_ENTER); 53 } 54 55 static void 56 kdi_system_release(void) 57 { 58 psm_notifyf(PSM_DEBUG_EXIT); 59 60 lbolt_debug_return(); 61 } 62 63 static cpu_t * 64 kdi_gdt2cpu(uintptr_t gdtbase) 65 { 66 cpu_t *cp = cpu_list; 67 68 if (cp == NULL) 69 return (NULL); 70 71 do { 72 if (gdtbase == (uintptr_t)cp->cpu_gdt) 73 return (cp); 74 } while ((cp = cp->cpu_next) != cpu_list); 75 76 return (NULL); 77 } 78 79 #if defined(__amd64) 80 uintptr_t 81 kdi_gdt2gsbase(uintptr_t gdtbase) 82 { 83 return ((uintptr_t)kdi_gdt2cpu(gdtbase)); 84 } 85 #endif 86 87 static uintptr_t 88 kdi_get_userlimit(void) 89 { 90 return (_userlimit); 91 } 92 93 static int 94 kdi_get_cpuinfo(uint_t *vendorp, uint_t *familyp, uint_t *modelp) 95 { 96 desctbr_t gdtr; 97 cpu_t *cpu; 98 99 /* 100 * CPU doesn't work until the GDT and gs/GSBASE have been set up. 101 * Boot-loaded kmdb will call us well before then, so we have to 102 * find the current cpu_t the hard way. 103 */ 104 rd_gdtr(&gdtr); 105 if ((cpu = kdi_gdt2cpu(gdtr.dtr_base)) == NULL || 106 !cpuid_checkpass(cpu, 1)) 107 return (EAGAIN); /* cpuid isn't done yet */ 108 109 *vendorp = cpuid_getvendor(cpu); 110 *familyp = cpuid_getfamily(cpu); 111 *modelp = cpuid_getmodel(cpu); 112 113 return (0); 114 } 115 116 void 117 kdi_idtr_set(gate_desc_t *idt, size_t limit) 118 { 119 desctbr_t idtr; 120 121 /* 122 * This rare case could happen if we entered kmdb whilst still on the 123 * fake CPU set up by boot_kdi_tmpinit(). We're trying to restore the 124 * kernel's IDT that we saved on entry, but it was from the fake cpu_t 125 * rather than the real IDT (which is still boot's). It's unpleasant, 126 * but we just encode knowledge that it's idt0 we want to restore. 127 */ 128 if (idt == NULL) 129 idt = idt0; 130 131 CPU->cpu_m.mcpu_idt = idt; 132 idtr.dtr_base = (uintptr_t)idt; 133 idtr.dtr_limit = limit; 134 kdi_idtr_write(&idtr); 135 } 136 137 static void 138 kdi_plat_call(void (*platfn)(void)) 139 { 140 if (platfn != NULL) 141 platfn(); 142 } 143 144 /* 145 * On Intel, most of these are shared between i86*, so this is really an 146 * arch_kdi_init(). 147 */ 148 void 149 mach_kdi_init(kdi_t *kdi) 150 { 151 kdi->kdi_plat_call = kdi_plat_call; 152 kdi->kdi_kmdb_enter = kmdb_enter; 153 kdi->mkdi_activate = kdi_activate; 154 kdi->mkdi_deactivate = kdi_deactivate; 155 kdi->mkdi_idt_switch = kdi_idt_switch; 156 kdi->mkdi_update_drreg = kdi_update_drreg; 157 kdi->mkdi_set_debug_msrs = kdi_set_debug_msrs; 158 kdi->mkdi_get_userlimit = kdi_get_userlimit; 159 kdi->mkdi_get_cpuinfo = kdi_get_cpuinfo; 160 kdi->mkdi_stop_slaves = kdi_stop_slaves; 161 kdi->mkdi_start_slaves = kdi_start_slaves; 162 kdi->mkdi_slave_wait = kdi_slave_wait; 163 kdi->mkdi_memrange_add = kdi_memrange_add; 164 kdi->mkdi_reboot = kdi_reboot; 165 } 166 167 void 168 plat_kdi_init(kdi_t *kdi) 169 { 170 kdi->pkdi_system_claim = kdi_system_claim; 171 kdi->pkdi_system_release = kdi_system_release; 172 } 173