| 47,20 → 47,60 |
|---|
| #include <mm/as.h> |
| #include <synch/spinlock.h> |
| #include <syscall/copy.h> |
| #include <adt/btree.h> |
| #include <arch.h> |
| #include <align.h> |
| #include <errno.h> |
| |
| /** This lock protects the parea_btree. */ |
| SPINLOCK_INITIALIZE(parea_lock); |
| |
| /** B+tree with enabled physical memory areas. */ |
| static btree_t parea_btree; |
| |
| /** Initialize DDI. */ |
| void ddi_init(void) |
| { |
| btree_create(&parea_btree); |
| } |
| |
| /** Enable piece of physical memory for mapping by physmem_map(). |
| * |
| * @param parea Pointer to physical area structure. |
| * |
| * @todo This function doesn't check for overlaps. It depends on the kernel to |
| * create disjunct physical memory areas. |
| */ |
| void ddi_parea_register(parea_t *parea) |
| { |
| ipl_t ipl; |
| |
| ipl = interrupts_disable(); |
| spinlock_lock(&parea_lock); |
| |
| /* |
| * TODO: we should really check for overlaps here. |
| * However, we should be safe because the kernel is pretty sane and |
| * memory of different devices doesn't overlap. |
| */ |
| btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL); |
| |
| spinlock_unlock(&parea_lock); |
| interrupts_restore(ipl); |
| } |
| |
| /** Map piece of physical memory into virtual address space of current task. |
| * |
| * @param pf Physical frame address of the starting frame. |
| * @param vp Virtual page address of the starting page. |
| * @param pf Physical address of the starting frame. |
| * @param vp Virtual address of the starting page. |
| * @param pages Number of pages to map. |
| * @param flags Address space area flags for the mapping. |
| * |
| * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
| * ENOENT if there is no task matching the specified ID and ENOMEM if |
| * there was a problem in creating address space area. |
| * @return 0 on success, EPERM if the caller lacks capabilities to use this |
| * syscall, ENOENT if there is no task matching the specified ID or the |
| * physical address space is not enabled for mapping and ENOMEM if there |
| * was a problem in creating address space area. ENOTSUP is returned when |
| * an attempt to create an illegal address alias is detected. |
| */ |
| static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags) |
| { |
| 79,6 → 119,40 |
|---|
| return EPERM; |
| |
| ipl = interrupts_disable(); |
| |
| /* |
| * Check if the physical memory area is enabled for mapping. |
| * If the architecture supports virtually indexed caches, intercept |
| * attempts to create an illegal address alias. |
| */ |
| spinlock_lock(&parea_lock); |
| parea_t *parea; |
| btree_node_t *nodep; |
| parea = btree_search(&parea_btree, (btree_key_t) pf, &nodep); |
| if (!parea || parea->frames < pages || ((flags & AS_AREA_CACHEABLE) && |
| !parea->cacheable) || (!(flags & AS_AREA_CACHEABLE) && |
| parea->cacheable)) { |
| /* |
| * This physical memory area cannot be mapped. |
| */ |
| spinlock_unlock(&parea_lock); |
| interrupts_restore(ipl); |
| return ENOENT; |
| } |
| |
| #ifdef CONFIG_VIRT_IDX_DCACHE |
| if (PAGE_COLOR(parea->vbase) != PAGE_COLOR(vp)) { |
| /* |
| * Refuse to create an illegal address alias. |
| */ |
| spinlock_unlock(&parea_lock); |
| interrupts_restore(ipl); |
| return ENOTSUP; |
| } |
| #endif /* CONFIG_VIRT_IDX_DCACHE */ |
| |
| spinlock_unlock(&parea_lock); |
| |
| spinlock_lock(&TASK->lock); |
| |
| if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE, |
| 107,8 → 181,8 |
|---|
| * @param ioaddr Starting I/O address. |
| * @param size Size of the enabled I/O space.. |
| * |
| * @return 0 on success, EPERM if the caller lacks capabilities to use this syscall, |
| * ENOENT if there is no task matching the specified ID. |
| * @return 0 on success, EPERM if the caller lacks capabilities to use this |
| * syscall, ENOENT if there is no task matching the specified ID. |
| */ |
| static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size) |
| { |
| 160,12 → 234,12 |
|---|
| * |
| * @return 0 on success, otherwise it returns error code found in errno.h |
| */ |
| unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base, unative_t pages, |
| unative_t flags) |
| unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base, unative_t |
| pages, unative_t flags) |
| { |
| return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base, FRAME_SIZE), |
| ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE), (count_t) pages, |
| (int) flags); |
| return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base, |
| FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE), |
| (count_t) pages, (int) flags); |
| } |
| |
| /** Wrapper for SYS_ENABLE_IOSPACE syscall. |
| 183,14 → 257,15 |
|---|
| if (rc != 0) |
| return (unative_t) rc; |
| |
| return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id, (uintptr_t) arg.ioaddr, (size_t) arg.size); |
| return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id, |
| (uintptr_t) arg.ioaddr, (size_t) arg.size); |
| } |
| |
| /** Disable or enable preemption. |
| * |
| * @param enable If non-zero, the preemption counter will be decremented, leading to potential |
| * enabling of preemption. Otherwise the preemption counter will be incremented, |
| * preventing preemption from occurring. |
| * @param enable If non-zero, the preemption counter will be decremented, |
| * leading to potential enabling of preemption. Otherwise the preemption |
| * counter will be incremented, preventing preemption from occurring. |
| * |
| * @return Zero on success or EPERM if callers capabilities are not sufficient. |
| */ |