1 /*
2 * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29 #include <mach/vm_types.h>
30 #include <i386/acpi.h> /* install_real_mode_bootstrap */
31 #include <i386/mp.h>
32 #include <i386/lapic.h> /* lapic_* functions */
33 #include <i386/machine_routines.h>
34 #include <i386/cpu_data.h>
35 #include <i386/pmap.h>
36 #include <i386/bit_routines.h>
37
38 /* PAL-related routines */
39 void i386_cpu_IPI(int cpu);
40 boolean_t i386_smp_init(int nmi_vector, i386_intr_func_t nmi_handler,
41 int ipi_vector, i386_intr_func_t ipi_handler);
42 void i386_start_cpu(int lapic_id, int cpu_num);
43 void i386_send_NMI(int cpu);
44 void handle_pending_TLB_flushes(void);
45 void NMIPI_enable(boolean_t);
46
47 extern void slave_pstart(void);
48
49 #ifdef MP_DEBUG
50 int trappedalready = 0; /* (BRINGUP) */
51 #endif /* MP_DEBUG */
52
53 boolean_t
i386_smp_init(int nmi_vector,i386_intr_func_t nmi_handler,int ipi_vector,i386_intr_func_t ipi_handler)54 i386_smp_init(int nmi_vector, i386_intr_func_t nmi_handler, int ipi_vector, i386_intr_func_t ipi_handler)
55 {
56 /* Local APIC? */
57 if (!lapic_probe()) {
58 return FALSE;
59 }
60
61 lapic_init();
62 lapic_configure(false);
63 lapic_set_intr_func(nmi_vector, nmi_handler);
64 lapic_set_intr_func(ipi_vector, ipi_handler);
65
66 install_real_mode_bootstrap(slave_pstart);
67
68 return TRUE;
69 }
70
71 void
i386_start_cpu(int lapic_id,__unused int cpu_num)72 i386_start_cpu(int lapic_id, __unused int cpu_num )
73 {
74 LAPIC_WRITE_ICR(lapic_id, LAPIC_ICR_DM_INIT);
75 delay(100);
76 LAPIC_WRITE_ICR(lapic_id,
77 LAPIC_ICR_DM_STARTUP | (REAL_MODE_BOOTSTRAP_OFFSET >> 12));
78 }
79
80 static boolean_t NMIPIs_enabled = FALSE;
81
82 void
NMIPI_enable(boolean_t enable)83 NMIPI_enable(boolean_t enable)
84 {
85 NMIPIs_enabled = enable;
86 }
87
88 void
i386_send_NMI(int cpu)89 i386_send_NMI(int cpu)
90 {
91 boolean_t state = ml_set_interrupts_enabled(FALSE);
92
93 if (NMIPIs_enabled == FALSE) {
94 i386_cpu_IPI(cpu);
95 } else {
96 lapic_send_nmi(cpu);
97 }
98 (void) ml_set_interrupts_enabled(state);
99 }
100
101 void
handle_pending_TLB_flushes(void)102 handle_pending_TLB_flushes(void)
103 {
104 volatile int *my_word = ¤t_cpu_datap()->cpu_signals;
105
106 if (i_bit(MP_TLB_FLUSH, my_word) && (pmap_tlb_flush_timeout == FALSE)) {
107 DBGLOG(cpu_handle, cpu_number(), MP_TLB_FLUSH);
108 i_bit_clear(MP_TLB_FLUSH, my_word);
109 pmap_update_interrupt();
110 }
111 }
112
113 void
i386_cpu_IPI(int cpu)114 i386_cpu_IPI(int cpu)
115 {
116 #ifdef MP_DEBUG
117 if (cpu_datap(cpu)->cpu_signals & 6) { /* (BRINGUP) */
118 kprintf("i386_cpu_IPI: sending enter debugger signal (%08X) to cpu %d\n", cpu_datap(cpu)->cpu_signals, cpu);
119 }
120 #endif /* MP_DEBUG */
121
122 lapic_send_ipi(cpu, LAPIC_VECTOR(INTERPROCESSOR));
123 }
124