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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/debugger.h> |
35 | #include <arch/debugger.h> |
36 | #include <arch/pm.h> |
36 | #include <arch/pm.h> |
37 | #include <arch/asm.h> |
37 | #include <arch/asm.h> |
- | 38 | #include <adt/bitmap.h> |
|
38 | 39 | ||
39 | /** Perform ia32 specific tasks needed before the new task is run. |
40 | /** Perform ia32 specific tasks needed before the new task is run. |
40 | * |
41 | * |
41 | * Interrupts are disabled. |
42 | * Interrupts are disabled. |
42 | */ |
43 | */ |
43 | void before_task_runs_arch(void) |
44 | void before_task_runs_arch(void) |
44 | { |
45 | { |
45 | size_t iomap_size; |
46 | count_t bits; |
46 | ptr_16_32_t cpugdtr; |
47 | ptr_16_32_t cpugdtr; |
47 | descriptor_t *gdt_p; |
48 | descriptor_t *gdt_p; |
48 | 49 | ||
49 | /* |
50 | /* |
50 | * Switch the I/O Permission Bitmap, if necessary. |
51 | * Switch the I/O Permission Bitmap, if necessary. |
51 | */ |
52 | */ |
52 | 53 | ||
53 | /* First, copy the I/O Permission Bitmap. */ |
54 | /* First, copy the I/O Permission Bitmap. */ |
54 | spinlock_lock(&TASK->lock); |
55 | spinlock_lock(&TASK->lock); |
55 | iomap_size = TASK->arch.iomap_size; |
56 | if ((bits = TASK->arch.iomap.bits)) { |
56 | if (iomap_size) { |
57 | bitmap_t iomap; |
- | 58 | ||
57 | ASSERT(TASK->arch.iomap); |
59 | ASSERT(TASK->arch.iomap.map); |
- | 60 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
|
58 | memcpy(CPU->arch.tss->iomap, TASK->arch.iomap, iomap_size); |
61 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
- | 62 | /* |
|
- | 63 | * It is safe to set the trailing four bits because of the extra |
|
- | 64 | * convenience byte in TSS_IOMAP_SIZE. |
|
- | 65 | */ |
|
59 | CPU->arch.tss->iomap[iomap_size] = 0xff; /* terminating byte */ |
66 | bitmap_set_range(&iomap, TASK->arch.iomap.bits, 4); |
60 | } |
67 | } |
61 | spinlock_unlock(&TASK->lock); |
68 | spinlock_unlock(&TASK->lock); |
62 | 69 | ||
63 | /* Second, adjust TSS segment limit. */ |
70 | /* Second, adjust TSS segment limit. */ |
64 | gdtr_store(&cpugdtr); |
71 | gdtr_store(&cpugdtr); |
65 | gdt_p = (descriptor_t *) cpugdtr.base; |
72 | gdt_p = (descriptor_t *) cpugdtr.base; |
66 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + iomap_size - 1); |
73 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1); |
67 | gdtr_load(&cpugdtr); |
74 | gdtr_load(&cpugdtr); |
68 | } |
75 | } |
69 | 76 | ||
70 | /** Perform ia32 specific tasks needed before the new thread is scheduled. |
77 | /** Perform ia32 specific tasks needed before the new thread is scheduled. |
71 | * |
78 | * |