28,14 → 28,29 |
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#include <proc/scheduler.h> |
#include <cpu.h> |
#include <proc/task.h> |
#include <proc/thread.h> |
#include <arch.h> |
#include <arch/context.h> /* SP_DELTA */ |
#include <arch/debugger.h> |
#include <arch/pm.h> |
#include <arch/asm.h> |
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/** Perform ia32 specific tasks needed before the new task is run. */ |
void before_task_runs_arch(void) |
{ |
} |
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/** Perform ia32 specific tasks needed before the new thread is scheduled. |
* |
* THREAD is locked and interrupts are disabled. |
*/ |
void before_thread_runs_arch(void) |
{ |
size_t iomap_size; |
ptr_16_32_t cpugdtr; |
descriptor_t *gdt_p; |
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CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
CPU->arch.tss->ss0 = selector(KDATA_DES); |
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42,6 → 57,30 |
/* Set up TLS in GS register */ |
set_tls_desc(THREAD->arch.tls); |
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/* |
* Switch the I/O Permission Bitmap, if necessary. |
* |
* First, copy the I/O Permission Bitmap. |
* This needs to be changed so that the |
* copying is avoided if the same task |
* was already running and the iomap did |
* not change. |
*/ |
spinlock_lock(&TASK->lock); |
iomap_size = TASK->arch.iomap_size; |
if (iomap_size) { |
ASSERT(TASK->arch.iomap); |
memcpy(CPU->arch.tss->iomap, TASK->arch.iomap, iomap_size); |
CPU->arch.tss->iomap[iomap_size] = 0xff; /* terminating byte */ |
} |
spinlock_unlock(&TASK->lock); |
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/* Second, adjust TSS segment limit. */ |
gdtr_store(&cpugdtr); |
gdt_p = (descriptor_t *) cpugdtr.base; |
gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + iomap_size - 1); |
gdtr_load(&cpugdtr); |
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#ifdef CONFIG_DEBUG_AS_WATCHPOINT |
/* Set watchpoint on AS to ensure that nobody sets it to zero */ |
if (CPU->id < BKPOINTS_MAX) |