Rev 1201 | Rev 1256 | Go to most recent revision | Only display areas with differences | Regard whitespace | Details | Blame | Last modification | View Log | RSS feed
Rev 1201 | Rev 1255 | ||
---|---|---|---|
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 | #include <adt/bitmap.h> |
39 | #include <adt/bitmap.h> |
40 | 40 | ||
41 | /** Perform amd64 specific tasks needed before the new task is run. |
41 | /** Perform amd64 specific tasks needed before the new task is run. |
42 | * |
42 | * |
43 | * Interrupts are disabled. |
43 | * Interrupts are disabled. |
44 | */ |
44 | */ |
45 | void before_task_runs_arch(void) |
45 | void before_task_runs_arch(void) |
46 | { |
46 | { |
47 | count_t bits; |
47 | count_t bits; |
48 | ptr_16_64_t cpugdtr; |
48 | ptr_16_64_t cpugdtr; |
49 | descriptor_t *gdt_p; |
49 | descriptor_t *gdt_p; |
- | 50 | tss_descriptor_t *tss_desc; |
|
50 | 51 | ||
51 | /* |
52 | /* |
52 | * Switch the I/O Permission Bitmap, if necessary. |
53 | * Switch the I/O Permission Bitmap, if necessary. |
53 | */ |
54 | */ |
54 | 55 | ||
55 | /* First, copy the I/O Permission Bitmap. */ |
56 | /* First, copy the I/O Permission Bitmap. */ |
56 | spinlock_lock(&TASK->lock); |
57 | spinlock_lock(&TASK->lock); |
57 | if ((bits = TASK->arch.iomap.bits)) { |
58 | if ((bits = TASK->arch.iomap.bits)) { |
58 | bitmap_t iomap; |
59 | bitmap_t iomap; |
59 | 60 | ||
60 | ASSERT(TASK->arch.iomap.map); |
61 | ASSERT(TASK->arch.iomap.map); |
61 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
62 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
62 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
63 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
63 | /* |
64 | /* |
64 | * It is safe to set the trailing four bits because of the extra |
65 | * It is safe to set the trailing eight bits because of the extra |
65 | * convenience byte in TSS_IOMAP_SIZE. |
66 | * convenience byte in TSS_IOMAP_SIZE. |
66 | */ |
67 | */ |
67 | bitmap_set_range(&iomap, TASK->arch.iomap.bits, 4); |
68 | bitmap_set_range(&iomap, TASK->arch.iomap.bits, 8); |
68 | } |
69 | } |
69 | spinlock_unlock(&TASK->lock); |
70 | spinlock_unlock(&TASK->lock); |
70 | 71 | ||
71 | /* Second, adjust TSS segment limit. */ |
72 | /* Second, adjust TSS segment limit. */ |
72 | gdtr_store(&cpugdtr); |
73 | gdtr_store(&cpugdtr); |
73 | gdt_p = (descriptor_t *) cpugdtr.base; |
74 | gdt_p = (descriptor_t *) cpugdtr.base; |
74 | gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1); |
75 | gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1); |
75 | gdtr_load(&cpugdtr); |
76 | gdtr_load(&cpugdtr); |
- | 77 | ||
- | 78 | /* |
|
- | 79 | * Before we load new TSS limit, the current TSS descriptor |
|
- | 80 | * type must be changed to describe inactive TSS. |
|
- | 81 | */ |
|
- | 82 | tss_desc = (tss_descriptor_t *) &gdt_p[TSS_DES]; |
|
- | 83 | tss_desc->type = AR_TSS; |
|
- | 84 | tr_load(gdtselector(TSS_DES)); |
|
76 | } |
85 | } |
77 | 86 | ||
78 | /** Perform amd64 specific tasks needed before the new thread is scheduled. */ |
87 | /** Perform amd64 specific tasks needed before the new thread is scheduled. */ |
79 | void before_thread_runs_arch(void) |
88 | void before_thread_runs_arch(void) |
80 | { |
89 | { |
81 | CPU->arch.tss->rsp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
90 | CPU->arch.tss->rsp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
82 | 91 | ||
83 | /* Syscall support - write address of thread stack pointer to |
92 | /* Syscall support - write address of thread stack pointer to |
84 | * hidden part of gs */ |
93 | * hidden part of gs */ |
85 | swapgs(); |
94 | swapgs(); |
86 | write_msr(AMD_MSR_GS, (__u64)&THREAD->kstack); |
95 | write_msr(AMD_MSR_GS, (__u64)&THREAD->kstack); |
87 | swapgs(); |
96 | swapgs(); |
88 | 97 | ||
89 | /* TLS support - set FS to thread local storage */ |
98 | /* TLS support - set FS to thread local storage */ |
90 | write_msr(AMD_MSR_FS, THREAD->arch.tls); |
99 | write_msr(AMD_MSR_FS, THREAD->arch.tls); |
91 | 100 | ||
92 | #ifdef CONFIG_DEBUG_AS_WATCHPOINT |
101 | #ifdef CONFIG_DEBUG_AS_WATCHPOINT |
93 | /* Set watchpoint on AS to ensure that nobody sets it to zero */ |
102 | /* Set watchpoint on AS to ensure that nobody sets it to zero */ |
94 | if (CPU->id < BKPOINTS_MAX) |
103 | if (CPU->id < BKPOINTS_MAX) |
95 | breakpoint_add(&((the_t *) THREAD->kstack)->as, |
104 | breakpoint_add(&((the_t *) THREAD->kstack)->as, |
96 | BKPOINT_WRITE | BKPOINT_CHECK_ZERO, |
105 | BKPOINT_WRITE | BKPOINT_CHECK_ZERO, |
97 | CPU->id); |
106 | CPU->id); |
98 | #endif |
107 | #endif |
99 | } |
108 | } |
100 | 109 | ||
101 | void after_thread_ran_arch(void) |
110 | void after_thread_ran_arch(void) |
102 | { |
111 | { |
103 | } |
112 | } |
104 | 113 |