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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2006 Jakub Jermar |
2 | * Copyright (C) 2006 Jakub Jermar |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
| 14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | /** @addtogroup sparc64proc |
29 | /** @addtogroup sparc64proc |
| 30 | * @{ |
30 | * @{ |
| 31 | */ |
31 | */ |
| 32 | /** @file |
32 | /** @file |
| 33 | */ |
33 | */ |
| 34 | 34 | ||
| 35 | #include <proc/scheduler.h> |
35 | #include <proc/scheduler.h> |
| 36 | #include <proc/thread.h> |
36 | #include <proc/thread.h> |
| 37 | #include <arch.h> |
37 | #include <arch.h> |
| 38 | #include <arch/asm.h> |
38 | #include <arch/asm.h> |
| 39 | #include <arch/regdef.h> |
- | |
| 40 | #include <arch/stack.h> |
39 | #include <arch/stack.h> |
| 41 | #include <arch/mm/tlb.h> |
- | |
| 42 | #include <arch/mm/page.h> |
- | |
| 43 | #include <config.h> |
- | |
| 44 | #include <align.h> |
- | |
| 45 | #include <macros.h> |
- | |
| 46 | 40 | ||
| 47 | /** Perform sparc64 specific tasks needed before the new task is run. */ |
41 | /** Perform sparc64 specific tasks needed before the new task is run. */ |
| 48 | void before_task_runs_arch(void) |
42 | void before_task_runs_arch(void) |
| 49 | { |
43 | { |
| 50 | } |
44 | } |
| 51 | 45 | ||
| 52 | /** Perform sparc64 specific steps before scheduling a thread. |
46 | /** Perform sparc64 specific steps before scheduling a thread. |
| 53 | * |
47 | * |
| 54 | * Ensure that thread's kernel stack, as well as userspace window buffer for |
- | |
| 55 | * userspace threads, are locked in DTLB. For userspace threads, initialize |
48 | * For userspace threads, initialize reserved global registers in the alternate |
| 56 | * reserved global registers in the alternate and interrupt sets. |
49 | * and interrupt sets. |
| 57 | */ |
50 | */ |
| 58 | void before_thread_runs_arch(void) |
51 | void before_thread_runs_arch(void) |
| 59 | { |
52 | { |
| 60 | uintptr_t base; |
- | |
| 61 | - | ||
| 62 | base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH); |
- | |
| 63 | - | ||
| 64 | if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 << |
- | |
| 65 | KERNEL_PAGE_WIDTH))) { |
- | |
| 66 | /* |
- | |
| 67 | * Kernel stack of this thread is not locked in DTLB. |
- | |
| 68 | * First, make sure it is not mapped already. |
- | |
| 69 | * If not, create a locked mapping for it. |
- | |
| 70 | */ |
- | |
| 71 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) |
- | |
| 72 | THREAD->kstack); |
- | |
| 73 | dtlb_insert_mapping((uintptr_t) THREAD->kstack, |
- | |
| 74 | KA2PA(THREAD->kstack), PAGESIZE_8K, true, true); |
- | |
| 75 | } |
- | |
| 76 | - | ||
| 77 | if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
53 | if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
| 78 | /* |
54 | /* |
| 79 | * If this thread executes also in userspace, we have to lock |
- | |
| 80 | * its userspace window buffer into DTLB. |
- | |
| 81 | */ |
- | |
| 82 | ASSERT(THREAD->arch.uspace_window_buffer); |
- | |
| 83 | uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) |
- | |
| 84 | THREAD->arch.uspace_window_buffer, PAGE_SIZE); |
- | |
| 85 | if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) |
- | |
| 86 | { |
- | |
| 87 | /* |
- | |
| 88 | * The buffer is not covered by the 4M locked kernel |
- | |
| 89 | * DTLB entry. |
- | |
| 90 | */ |
- | |
| 91 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf); |
- | |
| 92 | dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K, |
- | |
| 93 | true, true); |
- | |
| 94 | } |
- | |
| 95 | - | ||
| 96 | /* |
- | |
| 97 | * Write kernel stack address to %g6 of the alternate and |
55 | * Write kernel stack address to %g6 of the alternate and |
| 98 | * interrupt global sets. |
56 | * interrupt global sets. |
| 99 | * |
57 | * |
| 100 | * Write pointer to the last item in the userspace window buffer |
58 | * Write pointer to the last item in the userspace window buffer |
| 101 | * to %g7 in the alternate set. Write to the interrupt %g7 is |
59 | * to %g7 in the alternate set. Write to the interrupt %g7 is |
| 102 | * not necessary because: |
60 | * not necessary because: |
| 103 | * - spill traps operate only in the alternate global set, |
61 | * - spill traps operate only in the alternate global set, |
| 104 | * - preemptible trap handler switches to alternate globals |
62 | * - preemptible trap handler switches to alternate globals |
| 105 | * before it explicitly uses %g7. |
63 | * before it explicitly uses %g7. |
| 106 | */ |
64 | */ |
| 107 | uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE |
65 | uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE |
| 108 | - (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, |
66 | - (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, |
| 109 | STACK_ALIGNMENT)); |
67 | STACK_ALIGNMENT)); |
| 110 | write_to_ig_g6(sp); |
68 | write_to_ig_g6(sp); |
| 111 | write_to_ag_g6(sp); |
69 | write_to_ag_g6(sp); |
| 112 | write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer); |
70 | write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer); |
| 113 | } |
71 | } |
| 114 | } |
72 | } |
| 115 | 73 | ||
| 116 | /** Perform sparc64 specific steps before a thread stops running. |
74 | /** Perform sparc64 specific steps before a thread stops running. */ |
| 117 | * |
- | |
| 118 | * Demap any locked DTLB entries installed by the thread (i.e. kernel stack |
- | |
| 119 | * and userspace window buffer). |
- | |
| 120 | */ |
- | |
| 121 | void after_thread_ran_arch(void) |
75 | void after_thread_ran_arch(void) |
| 122 | { |
76 | { |
| 123 | uintptr_t base; |
- | |
| 124 | - | ||
| 125 | base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH); |
- | |
| 126 | - | ||
| 127 | if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 << |
- | |
| 128 | KERNEL_PAGE_WIDTH))) { |
- | |
| 129 | /* |
- | |
| 130 | * Kernel stack of this thread is locked in DTLB. |
- | |
| 131 | * Destroy the mapping. |
- | |
| 132 | */ |
- | |
| 133 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) |
- | |
| 134 | THREAD->kstack); |
- | |
| 135 | } |
- | |
| 136 | - | ||
| 137 | if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
77 | if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
| 138 | /* |
- | |
| 139 | * If this thread executes also in userspace, we have to |
- | |
| 140 | * demap the userspace window buffer from DTLB. |
- | |
| 141 | */ |
- | |
| 142 | ASSERT(THREAD->arch.uspace_window_buffer); |
- | |
| 143 | - | ||
| 144 | uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) |
- | |
| 145 | THREAD->arch.uspace_window_buffer, PAGE_SIZE); |
- | |
| 146 | if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) { |
- | |
| 147 | /* |
- | |
| 148 | * The buffer is not covered by the 4M locked kernel DTLB entry |
- | |
| 149 | * and therefore it was given a dedicated locked DTLB entry. |
- | |
| 150 | * Demap it. |
- | |
| 151 | */ |
- | |
| 152 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf); |
- | |
| 153 | } |
- | |
| 154 | - | ||
| 155 | /* sample the state of the userspace window buffer */ |
78 | /* sample the state of the userspace window buffer */ |
| 156 | THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7(); |
79 | THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7(); |
| 157 | } |
80 | } |
| 158 | } |
81 | } |
| 159 | 82 | ||
| 160 | /** @} |
83 | /** @} |
| 161 | */ |
84 | */ |
| 162 | 85 | ||