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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * Kernel/Debugger Interface (KDI) routines. Called during debugger under 30 * various system states (boot, while running, while the debugger has control). 31 * Functions intended for use while the debugger has control may not grab any 32 * locks or perform any functions that assume the availability of other system 33 * services. 34 */ 35 36 #include <sys/systm.h> 37 #include <sys/x86_archext.h> 38 #include <sys/kdi_impl.h> 39 #include <sys/smp_impldefs.h> 40 #include <sys/psm_types.h> 41 #include <sys/segments.h> 42 #include <sys/archsystm.h> 43 #include <sys/controlregs.h> 44 #include <sys/trap.h> 45 #include <sys/kobj.h> 46 #include <sys/kobj_impl.h> 47 48 static void 49 kdi_system_claim(void) 50 { 51 psm_notifyf(PSM_DEBUG_ENTER); 52 } 53 54 static void 55 kdi_system_release(void) 56 { 57 psm_notifyf(PSM_DEBUG_EXIT); 58 } 59 60 static cpu_t * 61 kdi_gdt2cpu(uintptr_t gdtbase) 62 { 63 cpu_t *cp = cpu_list; 64 65 if (cp == NULL) 66 return (NULL); 67 68 do { 69 if (gdtbase == (uintptr_t)cp->cpu_gdt) 70 return (cp); 71 } while ((cp = cp->cpu_next) != cpu_list); 72 73 return (NULL); 74 } 75 76 #if defined(__amd64) 77 uintptr_t 78 kdi_gdt2gsbase(uintptr_t gdtbase) 79 { 80 return ((uintptr_t)kdi_gdt2cpu(gdtbase)); 81 } 82 #endif 83 84 static uintptr_t 85 kdi_get_userlimit(void) 86 { 87 return (_userlimit); 88 } 89 90 static int 91 kdi_get_cpuinfo(uint_t *vendorp, uint_t *familyp, uint_t *modelp) 92 { 93 desctbr_t gdtr; 94 cpu_t *cpu; 95 96 /* 97 * CPU doesn't work until the GDT and gs/GSBASE have been set up. 98 * Boot-loaded kmdb will call us well before then, so we have to 99 * find the current cpu_t the hard way. 100 */ 101 rd_gdtr(&gdtr); 102 if ((cpu = kdi_gdt2cpu(gdtr.dtr_base)) == NULL || 103 !cpuid_checkpass(cpu, 1)) 104 return (EAGAIN); /* cpuid isn't done yet */ 105 106 *vendorp = cpuid_getvendor(cpu); 107 *familyp = cpuid_getfamily(cpu); 108 *modelp = cpuid_getmodel(cpu); 109 110 return (0); 111 } 112 113 void 114 kdi_idtr_set(gate_desc_t *idt, size_t limit) 115 { 116 desctbr_t idtr; 117 118 /* 119 * This rare case could happen if we entered kmdb whilst still on the 120 * fake CPU set up by boot_kdi_tmpinit(). We're trying to restore the 121 * kernel's IDT that we saved on entry, but it was from the fake cpu_t 122 * rather than the real IDT (which is still boot's). It's unpleasant, 123 * but we just encode knowledge that it's idt0 we want to restore. 124 */ 125 if (idt == NULL) 126 idt = idt0; 127 128 CPU->cpu_m.mcpu_idt = idt; 129 idtr.dtr_base = (uintptr_t)idt; 130 idtr.dtr_limit = limit; 131 kdi_idtr_write(&idtr); 132 } 133 134 static void 135 kdi_plat_call(void (*platfn)(void)) 136 { 137 if (platfn != NULL) 138 platfn(); 139 } 140 141 /* 142 * On Intel, most of these are shared between i86*, so this is really an 143 * arch_kdi_init(). 144 */ 145 void 146 mach_kdi_init(kdi_t *kdi) 147 { 148 kdi->kdi_plat_call = kdi_plat_call; 149 kdi->kdi_kmdb_enter = kmdb_enter; 150 kdi->mkdi_activate = kdi_activate; 151 kdi->mkdi_deactivate = kdi_deactivate; 152 kdi->mkdi_idt_switch = kdi_idt_switch; 153 kdi->mkdi_update_drreg = kdi_update_drreg; 154 kdi->mkdi_set_debug_msrs = kdi_set_debug_msrs; 155 kdi->mkdi_get_userlimit = kdi_get_userlimit; 156 kdi->mkdi_get_cpuinfo = kdi_get_cpuinfo; 157 kdi->mkdi_stop_slaves = kdi_stop_slaves; 158 kdi->mkdi_start_slaves = kdi_start_slaves; 159 kdi->mkdi_slave_wait = kdi_slave_wait; 160 kdi->mkdi_memrange_add = kdi_memrange_add; 161 kdi->mkdi_reboot = kdi_reboot; 162 } 163 164 void 165 plat_kdi_init(kdi_t *kdi) 166 { 167 kdi->pkdi_system_claim = kdi_system_claim; 168 kdi->pkdi_system_release = kdi_system_release; 169 } 170