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