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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> |
39 | #include <arch/regdef.h> |
40 | #include <arch/stack.h> |
40 | #include <arch/stack.h> |
41 | #include <arch/mm/tlb.h> |
41 | #include <arch/mm/tlb.h> |
42 | #include <arch/mm/page.h> |
42 | #include <arch/mm/page.h> |
43 | #include <config.h> |
43 | #include <config.h> |
44 | #include <align.h> |
44 | #include <align.h> |
45 | #include <macros.h> |
45 | #include <macros.h> |
46 | 46 | ||
47 | /** Perform sparc64 specific tasks needed before the new task is run. */ |
47 | /** Perform sparc64 specific tasks needed before the new task is run. */ |
48 | void before_task_runs_arch(void) |
48 | void before_task_runs_arch(void) |
49 | { |
49 | { |
50 | } |
50 | } |
51 | 51 | ||
52 | /** Perform sparc64 specific steps before scheduling a thread. |
52 | /** Perform sparc64 specific steps before scheduling a thread. |
53 | * |
53 | * |
54 | * Ensure that thread's kernel stack, as well as userspace window buffer for |
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 |
55 | * userspace threads, are locked in DTLB. For userspace threads, initialize |
56 | * reserved global registers in the alternate and interrupt sets. |
56 | * reserved global registers in the alternate and interrupt sets. |
57 | */ |
57 | */ |
58 | void before_thread_runs_arch(void) |
58 | void before_thread_runs_arch(void) |
59 | { |
59 | { |
60 | uintptr_t base; |
60 | uintptr_t base; |
61 | 61 | ||
62 | base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH); |
62 | base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH); |
63 | 63 | ||
64 | if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 << |
64 | if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 << |
65 | KERNEL_PAGE_WIDTH))) { |
65 | KERNEL_PAGE_WIDTH))) { |
66 | /* |
66 | /* |
67 | * Kernel stack of this thread is not locked in DTLB. |
67 | * Kernel stack of this thread is not locked in DTLB. |
68 | * First, make sure it is not mapped already. |
68 | * First, make sure it is not mapped already. |
69 | * If not, create a locked mapping for it. |
69 | * If not, create a locked mapping for it. |
70 | */ |
70 | */ |
71 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) |
71 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) |
72 | THREAD->kstack); |
72 | THREAD->kstack); |
73 | dtlb_insert_mapping((uintptr_t) THREAD->kstack, |
73 | dtlb_insert_mapping((uintptr_t) THREAD->kstack, |
74 | KA2PA(THREAD->kstack), PAGESIZE_8K, true, true); |
74 | KA2PA(THREAD->kstack), PAGESIZE_8K, true, true); |
75 | } |
75 | } |
76 | 76 | ||
77 | if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
77 | if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
78 | /* |
78 | /* |
79 | * If this thread executes also in userspace, we have to lock |
79 | * If this thread executes also in userspace, we have to lock |
80 | * its userspace window buffer into DTLB. |
80 | * its userspace window buffer into DTLB. |
81 | */ |
81 | */ |
82 | ASSERT(THREAD->arch.uspace_window_buffer); |
82 | ASSERT(THREAD->arch.uspace_window_buffer); |
83 | uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) |
83 | uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) |
84 | THREAD->arch.uspace_window_buffer, PAGE_SIZE); |
84 | THREAD->arch.uspace_window_buffer, PAGE_SIZE); |
85 | if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) |
85 | if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) |
86 | { |
86 | { |
87 | /* |
87 | /* |
88 | * The buffer is not covered by the 4M locked kernel |
88 | * The buffer is not covered by the 4M locked kernel |
89 | * DTLB entry. |
89 | * DTLB entry. |
90 | */ |
90 | */ |
91 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf); |
91 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf); |
92 | dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K, |
92 | dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K, |
93 | true, true); |
93 | true, true); |
94 | } |
94 | } |
95 | 95 | ||
96 | /* |
96 | /* |
97 | * Write kernel stack address to %g6 and a pointer to the last |
97 | * Write kernel stack address to %g6 of the alternate and |
- | 98 | * interrupt global sets. |
|
- | 99 | * |
|
- | 100 | * Write pointer to the last item in the userspace window buffer |
|
98 | * item in the userspace window buffer to %g7 in the alternate |
101 | * to %g7 in the alternate set. Write to the interrupt %g7 is |
99 | * and interrupt sets. |
102 | * not necessary because: |
- | 103 | * - spill traps operate only in the alternate global set, |
|
- | 104 | * - preemptible trap handler switches to alternate globals |
|
- | 105 | * before it explicitly uses %g7. |
|
100 | */ |
106 | */ |
101 | uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE |
107 | uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE |
102 | - (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, |
108 | - (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, |
103 | STACK_ALIGNMENT)); |
109 | STACK_ALIGNMENT)); |
104 | write_to_ig_g6(sp); |
110 | write_to_ig_g6(sp); |
105 | write_to_ag_g6(sp); |
111 | write_to_ag_g6(sp); |
106 | write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer); |
112 | write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer); |
107 | } |
113 | } |
108 | } |
114 | } |
109 | 115 | ||
110 | /** Perform sparc64 specific steps before a thread stops running. |
116 | /** Perform sparc64 specific steps before a thread stops running. |
111 | * |
117 | * |
112 | * Demap any locked DTLB entries isntalled by the thread (i.e. kernel stack |
118 | * Demap any locked DTLB entries installed by the thread (i.e. kernel stack |
113 | * and userspace window buffer). |
119 | * and userspace window buffer). |
114 | */ |
120 | */ |
115 | void after_thread_ran_arch(void) |
121 | void after_thread_ran_arch(void) |
116 | { |
122 | { |
117 | uintptr_t base; |
123 | uintptr_t base; |
118 | 124 | ||
119 | base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH); |
125 | base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH); |
120 | 126 | ||
121 | if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 << |
127 | if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 << |
122 | KERNEL_PAGE_WIDTH))) { |
128 | KERNEL_PAGE_WIDTH))) { |
123 | /* |
129 | /* |
124 | * Kernel stack of this thread is locked in DTLB. |
130 | * Kernel stack of this thread is locked in DTLB. |
125 | * Destroy the mapping. |
131 | * Destroy the mapping. |
126 | */ |
132 | */ |
127 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) |
133 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) |
128 | THREAD->kstack); |
134 | THREAD->kstack); |
129 | } |
135 | } |
130 | 136 | ||
131 | if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
137 | if ((THREAD->flags & THREAD_FLAG_USPACE)) { |
132 | /* |
138 | /* |
133 | * If this thread executes also in userspace, we have to |
139 | * If this thread executes also in userspace, we have to |
134 | * demap the userspace window buffer from DTLB. |
140 | * demap the userspace window buffer from DTLB. |
135 | */ |
141 | */ |
136 | ASSERT(THREAD->arch.uspace_window_buffer); |
142 | ASSERT(THREAD->arch.uspace_window_buffer); |
137 | 143 | ||
138 | uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) |
144 | uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) |
139 | THREAD->arch.uspace_window_buffer, PAGE_SIZE); |
145 | THREAD->arch.uspace_window_buffer, PAGE_SIZE); |
140 | if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) { |
146 | if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) { |
141 | /* |
147 | /* |
142 | * The buffer is not covered by the 4M locked kernel DTLB entry |
148 | * The buffer is not covered by the 4M locked kernel DTLB entry |
143 | * and therefore it was given a dedicated locked DTLB entry. |
149 | * and therefore it was given a dedicated locked DTLB entry. |
144 | * Demap it. |
150 | * Demap it. |
145 | */ |
151 | */ |
146 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf); |
152 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf); |
147 | } |
153 | } |
148 | 154 | ||
149 | /* sample the state of the userspace window buffer */ |
155 | /* sample the state of the userspace window buffer */ |
150 | THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7(); |
156 | THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7(); |
151 | } |
157 | } |
152 | } |
158 | } |
153 | 159 | ||
154 | /** @} |
160 | /** @} |
155 | */ |
161 | */ |
156 | 162 |