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 /* 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/hypervisor.h> 46 #include <sys/bootconf.h> 47 #include <sys/bootinfo.h> 48 #include <sys/promif.h> 49 #include <sys/evtchn_impl.h> 50 #include <sys/cpu.h> 51 #include <vm/kboot_mmu.h> 52 #include <vm/hat_pte.h> 53 54 static volatile int kdi_slaves_go; 55 56 /* 57 * These are not safe against dropping into kmdb when fbt::: is active. This is 58 * also broken on i86pc... 59 */ 60 61 void 62 kdi_idtr_write(desctbr_t *idtr) 63 { 64 gate_desc_t *idt = (gate_desc_t *)idtr->dtr_base; 65 uint_t nidt = (idtr->dtr_limit + 1) / sizeof (*idt); 66 uint_t vec; 67 68 for (vec = 0; vec < nidt; vec++, idt++) 69 xen_idt_write(idt, vec); 70 } 71 72 void 73 kdi_idt_write(gate_desc_t *gate, uint_t vec) 74 { 75 gate_desc_t *idt = CPU->cpu_m.mcpu_idt; 76 77 /* 78 * See kdi_idtr_set(). 79 */ 80 if (idt != NULL) 81 idt[vec] = *gate; 82 83 xen_idt_write(gate, vec); 84 } 85 86 ulong_t 87 kdi_dreg_get(int reg) 88 { 89 return (__hypercall1(__HYPERVISOR_get_debugreg, (long)reg)); 90 } 91 92 void 93 kdi_dreg_set(int reg, ulong_t value) 94 { 95 (void) __hypercall2(__HYPERVISOR_set_debugreg, (long)reg, value); 96 } 97 98 void 99 kdi_flush_caches(void) 100 { 101 } 102 103 /* 104 * To avoid domains sucking up CPU while sitting in kmdb, we make all the slave 105 * CPUs wait for a wake-up evtchn. The master CPU, meanwhile, sleeps for 106 * console activity. 107 */ 108 109 extern void kdi_slave_entry(void); 110 111 void 112 kdi_stop_slaves(int cpu, int doxc) 113 { 114 if (doxc) 115 kdi_xc_others(cpu, kdi_slave_entry); 116 kdi_slaves_go = 0; 117 } 118 119 void 120 kdi_start_slaves(void) 121 { 122 int c; 123 124 kdi_slaves_go = 1; 125 126 for (c = 0; c < NCPU; c++) { 127 if (cpu[c] == NULL || !(cpu[c]->cpu_flags & CPU_READY)) 128 continue; 129 ec_try_ipi(XC_CPUPOKE_PIL, c); 130 } 131 } 132 133 /*ARGSUSED*/ 134 static int 135 check_slave(void *arg) 136 { 137 return (kdi_slaves_go == 1); 138 } 139 140 void 141 kdi_slave_wait(void) 142 { 143 if (!(cpu[CPU->cpu_id]->cpu_flags & CPU_READY)) 144 return; 145 146 ec_wait_on_ipi(XC_CPUPOKE_PIL, check_slave, NULL); 147 } 148 149 /* 150 * Caution. 151 * These routines are called -extremely- early, during kmdb initialization. 152 * 153 * Many common kernel functions assume that %gs has been initialized, 154 * and fail horribly if it hasn't. At this point, the boot code has 155 * reserved a descriptor for us (KMDBGS_SEL) in it's GDT; arrange for it 156 * to point at a dummy cpu_t, temporarily at least. 157 * 158 * Note that kmdb entry relies on the fake cpu_t having zero cpu_idt/cpu_id. 159 */ 160 161 162 void * 163 boot_kdi_tmpinit(void) 164 { 165 cpu_t *cpu = kobj_zalloc(sizeof (*cpu), KM_TMP); 166 user_desc_t *bgdt; 167 uint64_t gdtpa; 168 ulong_t ma[1]; 169 170 cpu->cpu_self = cpu; 171 172 /* 173 * (Note that we had better switch to a -new- GDT before 174 * we discard the KM_TMP mappings, or disaster will ensue.) 175 */ 176 bgdt = kobj_zalloc(PAGESIZE, KM_TMP); 177 ASSERT(((uintptr_t)bgdt & PAGEOFFSET) == 0); 178 179 init_boot_gdt(bgdt); 180 181 gdtpa = pfn_to_pa(va_to_pfn(bgdt)); 182 ma[0] = (ulong_t)(pa_to_ma(gdtpa) >> PAGESHIFT); 183 kbm_read_only((uintptr_t)bgdt, gdtpa); 184 if (HYPERVISOR_set_gdt(ma, PAGESIZE / sizeof (user_desc_t))) 185 panic("boot_kdi_tmpinit:HYPERVISOR_set_gdt() failed"); 186 187 load_segment_registers(B64CODE_SEL, 0, 0, B32DATA_SEL); 188 189 /* 190 * Now point %gsbase to our temp cpu structure. 191 */ 192 xen_set_segment_base(SEGBASE_GS_KERNEL, (ulong_t)cpu); 193 return (0); 194 } 195 196 /*ARGSUSED*/ 197 void 198 boot_kdi_tmpfini(void *old) 199 { 200 /* 201 * This breaks, why do we need it anyway? 202 */ 203 #if 0 /* XXPV */ 204 load_segment_registers(B64CODE_SEL, 0, KMDBGS_SEL, B32DATA_SEL); 205 #endif 206 } 207