| 28,6 → 28,7 |
|---|
| |
| #include <proc/scheduler.h> |
| #include <cpu.h> |
| #include <proc/task.h> |
| #include <proc/thread.h> |
| #include <arch.h> |
| #include <arch/context.h> /* SP_DELTA */ |
| 34,21 → 35,55 |
|---|
| #include <arch/asm.h> |
| #include <arch/debugger.h> |
| #include <print.h> |
| #include <arch/pm.h> |
| |
| /** Perform amd64 specific tasks needed before the new task is run. */ |
| void before_task_runs_arch(void) |
| { |
| } |
| |
| /** Perform amd64 specific tasks needed before the new thread is scheduled. */ |
| void before_thread_runs_arch(void) |
| { |
| size_t iomap_size; |
| ptr_16_64_t cpugdtr; |
| descriptor_t *gdt_p; |
| |
| CPU->arch.tss->rsp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
| |
| /* Syscall support - write address of thread stack pointer to |
| * hidden part of gs */ |
| swapgs(); |
| write_msr(AMD_MSR_GS, |
| (__u64)&THREAD->kstack); |
| write_msr(AMD_MSR_GS, (__u64)&THREAD->kstack); |
| swapgs(); |
| |
| /* TLS support - set FS to thread local storage */ |
| write_msr(AMD_MSR_FS, THREAD->arch.tls); |
| |
| /* |
| * 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); |
| |
| /* Second, adjust TSS segment limit. */ |
| gdtr_store(&cpugdtr); |
| gdt_p = (descriptor_t *) cpugdtr.base; |
| gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + iomap_size - 1); |
| gdtr_load(&cpugdtr); |
| |
| #ifdef CONFIG_DEBUG_AS_WATCHPOINT |
| /* Set watchpoint on AS to ensure that nobody sets it to zero */ |
| if (CPU->id < BKPOINTS_MAX) |