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1 | /* |
1 | /* |
2 | * Copyright (C) 2005 Ondrej Palkovsky |
2 | * Copyright (C) 2005 Ondrej Palkovsky |
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 | #include <proc/scheduler.h> |
29 | #include <proc/scheduler.h> |
30 | #include <cpu.h> |
30 | #include <cpu.h> |
31 | #include <proc/task.h> |
31 | #include <proc/task.h> |
32 | #include <proc/thread.h> |
32 | #include <proc/thread.h> |
33 | #include <arch.h> |
33 | #include <arch.h> |
34 | #include <arch/context.h> /* SP_DELTA */ |
34 | #include <arch/context.h> /* SP_DELTA */ |
35 | #include <arch/asm.h> |
35 | #include <arch/asm.h> |
36 | #include <arch/debugger.h> |
36 | #include <arch/debugger.h> |
37 | #include <print.h> |
37 | #include <print.h> |
38 | #include <arch/pm.h> |
38 | #include <arch/pm.h> |
39 | 39 | ||
40 | /** Perform amd64 specific tasks needed before the new task is run. */ |
40 | /** Perform amd64 specific tasks needed before the new task is run. |
- | 41 | * |
|
- | 42 | * Interrupts are disabled. |
|
- | 43 | */ |
|
41 | void before_task_runs_arch(void) |
44 | void before_task_runs_arch(void) |
42 | { |
45 | { |
43 | } |
- | |
44 | - | ||
45 | /** Perform amd64 specific tasks needed before the new thread is scheduled. */ |
- | |
46 | void before_thread_runs_arch(void) |
- | |
47 | { |
- | |
48 | size_t iomap_size; |
46 | size_t iomap_size; |
49 | ptr_16_64_t cpugdtr; |
47 | ptr_16_64_t cpugdtr; |
50 | descriptor_t *gdt_p; |
48 | descriptor_t *gdt_p; |
51 | 49 | ||
52 | CPU->arch.tss->rsp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
- | |
53 | - | ||
54 | /* Syscall support - write address of thread stack pointer to |
- | |
55 | * hidden part of gs */ |
- | |
56 | swapgs(); |
- | |
57 | write_msr(AMD_MSR_GS, (__u64)&THREAD->kstack); |
- | |
58 | swapgs(); |
- | |
59 | - | ||
60 | /* TLS support - set FS to thread local storage */ |
- | |
61 | write_msr(AMD_MSR_FS, THREAD->arch.tls); |
- | |
62 | - | ||
63 | /* |
50 | /* |
64 | * Switch the I/O Permission Bitmap, if necessary. |
51 | * Switch the I/O Permission Bitmap, if necessary. |
65 | * |
- | |
66 | * First, copy the I/O Permission Bitmap. |
- | |
67 | * This needs to be changed so that the |
- | |
68 | * copying is avoided if the same task |
- | |
69 | * was already running and the iomap did |
- | |
70 | * not change. |
- | |
71 | */ |
52 | */ |
- | 53 | ||
- | 54 | /* First, copy the I/O Permission Bitmap. */ |
|
72 | spinlock_lock(&TASK->lock); |
55 | spinlock_lock(&TASK->lock); |
73 | iomap_size = TASK->arch.iomap_size; |
56 | iomap_size = TASK->arch.iomap_size; |
74 | if (iomap_size) { |
57 | if (iomap_size) { |
75 | ASSERT(TASK->arch.iomap); |
58 | ASSERT(TASK->arch.iomap); |
76 | memcpy(CPU->arch.tss->iomap, TASK->arch.iomap, iomap_size); |
59 | memcpy(CPU->arch.tss->iomap, TASK->arch.iomap, iomap_size); |
77 | CPU->arch.tss->iomap[iomap_size] = 0xff; /* terminating byte */ |
60 | CPU->arch.tss->iomap[iomap_size] = 0xff; /* terminating byte */ |
78 | } |
61 | } |
79 | spinlock_unlock(&TASK->lock); |
62 | spinlock_unlock(&TASK->lock); |
80 | 63 | ||
81 | /* Second, adjust TSS segment limit. */ |
64 | /* Second, adjust TSS segment limit. */ |
82 | gdtr_store(&cpugdtr); |
65 | gdtr_store(&cpugdtr); |
83 | gdt_p = (descriptor_t *) cpugdtr.base; |
66 | gdt_p = (descriptor_t *) cpugdtr.base; |
84 | gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + iomap_size - 1); |
67 | gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + iomap_size - 1); |
85 | gdtr_load(&cpugdtr); |
68 | gdtr_load(&cpugdtr); |
- | 69 | } |
|
- | 70 | ||
- | 71 | /** Perform amd64 specific tasks needed before the new thread is scheduled. */ |
|
- | 72 | void before_thread_runs_arch(void) |
|
- | 73 | { |
|
- | 74 | CPU->arch.tss->rsp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
|
- | 75 | ||
- | 76 | /* Syscall support - write address of thread stack pointer to |
|
- | 77 | * hidden part of gs */ |
|
- | 78 | swapgs(); |
|
- | 79 | write_msr(AMD_MSR_GS, (__u64)&THREAD->kstack); |
|
- | 80 | swapgs(); |
|
- | 81 | ||
- | 82 | /* TLS support - set FS to thread local storage */ |
|
- | 83 | write_msr(AMD_MSR_FS, THREAD->arch.tls); |
|
86 | 84 | ||
87 | #ifdef CONFIG_DEBUG_AS_WATCHPOINT |
85 | #ifdef CONFIG_DEBUG_AS_WATCHPOINT |
88 | /* Set watchpoint on AS to ensure that nobody sets it to zero */ |
86 | /* Set watchpoint on AS to ensure that nobody sets it to zero */ |
89 | if (CPU->id < BKPOINTS_MAX) |
87 | if (CPU->id < BKPOINTS_MAX) |
90 | breakpoint_add(&((the_t *) THREAD->kstack)->as, |
88 | breakpoint_add(&((the_t *) THREAD->kstack)->as, |
91 | BKPOINT_WRITE | BKPOINT_CHECK_ZERO, |
89 | BKPOINT_WRITE | BKPOINT_CHECK_ZERO, |
92 | CPU->id); |
90 | CPU->id); |
93 | #endif |
91 | #endif |
94 | } |
92 | } |
95 | 93 | ||
96 | void after_thread_ran_arch(void) |
94 | void after_thread_ran_arch(void) |
97 | { |
95 | { |
98 | } |
96 | } |
99 | 97 |