| 27,6 → 27,7 |
|---|
| */ |
| |
| #include <ddi/ddi.h> |
| #include <arch/ddi/ddi.h> |
| #include <proc/task.h> |
| #include <arch/types.h> |
| #include <typedefs.h> |
| 35,6 → 36,8 |
|---|
| #include <arch/pm.h> |
| #include <errno.h> |
| #include <arch/cpu.h> |
| #include <cpu.h> |
| #include <arch.h> |
| |
| /** Enable I/O space range for task. |
| * |
| 89,6 → 92,11 |
|---|
| */ |
| bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size); |
| |
| /* |
| * Increment I/O Permission bitmap generation counter. |
| */ |
| task->arch.iomapver++; |
| |
| return 0; |
| } |
| |
| 105,3 → 113,54 |
|---|
| *flags &= ~EFLAGS_IF; |
| return 0; |
| } |
| |
| /** Install I/O Permission bitmap. |
| * |
| * Current task's I/O permission bitmap, if any, is installed |
| * in the current CPU's TSS. |
| * |
| * Interrupts must be disabled prior this call. |
| */ |
| void io_perm_bitmap_install(void) |
| { |
| count_t bits; |
| ptr_16_32_t cpugdtr; |
| descriptor_t *gdt_p; |
| count_t ver; |
| |
| /* First, copy the I/O Permission Bitmap. */ |
| spinlock_lock(&TASK->lock); |
| ver = TASK->arch.iomapver; |
| if ((bits = TASK->arch.iomap.bits)) { |
| bitmap_t iomap; |
| |
| ASSERT(TASK->arch.iomap.map); |
| bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
| bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
| /* |
| * It is safe to set the trailing eight bits because of the extra |
| * convenience byte in TSS_IOMAP_SIZE. |
| */ |
| bitmap_set_range(&iomap, TASK->arch.iomap.bits, 8); |
| } |
| spinlock_unlock(&TASK->lock); |
| |
| /* Second, adjust TSS segment limit. */ |
| gdtr_store(&cpugdtr); |
| gdt_p = (descriptor_t *) cpugdtr.base; |
| gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1); |
| gdtr_load(&cpugdtr); |
| |
| /* |
| * Before we load new TSS limit, the current TSS descriptor |
| * type must be changed to describe inactive TSS. |
| */ |
| gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL; |
| tr_load(selector(TSS_DES)); |
| |
| /* |
| * Update the generation count so that faults caused by |
| * early accesses can be serviced. |
| */ |
| CPU->arch.iomapver_copy = ver; |
| } |