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rt-thread-official/components/mm/mm_aspace.c

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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-14 WangXiaoyao the first version
* 2023-08-17 Shell Add unmap_range for MAP_PRIVATE
* Support MAP_FIXED in aspace_map(), and
* Add better support of permission in mmap
*/
/**
* @brief Virtual Address Space
*/
#include <rtthread.h>
#define DBG_TAG "mm.aspace"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include "avl_adpt.h"
#include "mm_private.h"
#include <mmu.h>
#include <tlb.h>
#include <stddef.h>
#include <stdint.h>
#define ALIGNED(addr) (!((rt_size_t)(addr) & ARCH_PAGE_MASK))
static void *_find_free(rt_aspace_t aspace, void *prefer, rt_size_t req_size,
void *limit_start, rt_size_t limit_size,
mm_flag_t flags);
static int _unmap_range_locked(rt_aspace_t aspace, void *addr, size_t length);
struct rt_aspace rt_kernel_space;
static int _init_lock(rt_aspace_t aspace)
{
int err;
MM_PGTBL_LOCK_INIT(aspace);
err = rt_mutex_init(&aspace->bst_lock, "aspace", RT_IPC_FLAG_FIFO);
return err;
}
rt_err_t rt_aspace_init(rt_aspace_t aspace, void *start, rt_size_t length, void *pgtbl)
{
int err = RT_EOK;
if (pgtbl)
{
aspace->page_table = pgtbl;
aspace->start = start;
aspace->size = length;
aspace->private_object = RT_NULL;
err = _aspace_bst_init(aspace);
if (err == RT_EOK)
{
/**
* It has the side effect that lock will be added to object
* system management. So it must be paired with a detach once
* the initialization return successfully.
*/
err = _init_lock(aspace);
}
}
else
{
err = -RT_EINVAL;
}
return err;
}
rt_aspace_t rt_aspace_create(void *start, rt_size_t length, void *pgtbl)
{
rt_aspace_t aspace = NULL;
int err;
RT_ASSERT(length <= 0 - (rt_size_t)start);
aspace = (rt_aspace_t)rt_malloc(sizeof(*aspace));
if (aspace)
{
rt_memset(aspace, 0, sizeof(*aspace));
err = rt_aspace_init(aspace, start, length, pgtbl);
if (err != RT_EOK)
{
LOG_W("%s(%p, %lx, %p): failed with code %d\n", __func__,
start, length, pgtbl, err);
rt_free(aspace);
aspace = RT_NULL;
}
}
return aspace;
}
void rt_aspace_detach(rt_aspace_t aspace)
{
rt_varea_t varea;
WR_LOCK(aspace);
varea = ASPACE_VAREA_FIRST(aspace);
while (varea)
{
rt_varea_t prev = varea;
varea = ASPACE_VAREA_NEXT(varea);
_varea_uninstall_locked(prev);
if (VAREA_NOT_STATIC(prev))
{
rt_free(prev);
}
}
WR_UNLOCK(aspace);
rt_aspace_anon_ref_dec(aspace->private_object);
rt_mutex_detach(&aspace->bst_lock);
}
void rt_aspace_delete(rt_aspace_t aspace)
{
RT_ASSERT(aspace);
rt_aspace_detach(aspace);
rt_free(aspace);
}
rt_inline rt_size_t _get_effect_attr(rt_aspace_t aspace, rt_varea_t varea)
{
rt_size_t attr = varea->attr;
/* not write permission for user on private mapping */
if (rt_varea_is_private_locked(varea))
attr = rt_hw_mmu_attr_rm_perm(attr, RT_HW_MMU_PROT_USER | RT_HW_MMU_PROT_WRITE);
return attr;
}
static int _do_named_map(rt_aspace_t aspace, rt_varea_t varea, void *vaddr,
rt_size_t length, rt_size_t offset, rt_size_t attr)
{
LOG_D("%s: va %p length %p", __func__, vaddr, length);
int err = RT_EOK;
/* it's ensured by caller that (void*)end will not overflow */
void *phyaddr = (void *)(offset << MM_PAGE_SHIFT);
void *ret;
attr = _get_effect_attr(aspace, varea);
ret = rt_hw_mmu_map(aspace, vaddr, phyaddr, length, attr);
if (ret == RT_NULL)
{
err = -RT_ERROR;
}
if (err == RT_EOK)
rt_hw_tlb_invalidate_range(aspace, vaddr, length, ARCH_PAGE_SIZE);
return err;
}
rt_inline void _do_page_fault(struct rt_aspace_fault_msg *msg, rt_size_t off,
void *vaddr, rt_mem_obj_t mem_obj,
rt_varea_t varea)
{
msg->off = off;
msg->fault_vaddr = vaddr;
msg->fault_op = MM_FAULT_OP_READ;
msg->fault_type = MM_FAULT_TYPE_PAGE_FAULT;
msg->response.status = MM_FAULT_STATUS_UNRECOVERABLE;
msg->response.vaddr = 0;
msg->response.size = 0;
RT_ASSERT(mem_obj->on_page_fault);
mem_obj->on_page_fault(varea, msg);
}
int rt_varea_map_with_msg(rt_varea_t varea, struct rt_aspace_fault_msg *msg)
{
rt_aspace_t aspace;
int err = -RT_ERROR;
if (msg->response.status == MM_FAULT_STATUS_OK)
{
/**
* the page returned by handler is not checked
* cause no much assumption can make on it
*/
char *store = msg->response.vaddr;
rt_size_t store_sz = msg->response.size;
if ((char *)msg->fault_vaddr + store_sz > (char *)varea->start + varea->size)
{
LOG_W("%s: too much (0x%lx) of buffer on vaddr %p is provided",
__func__, store_sz, msg->fault_vaddr);
}
else
{
void *map;
rt_size_t attr;
void *v_addr = msg->fault_vaddr;
void *p_addr = store + PV_OFFSET;
aspace = varea->aspace;
RT_ASSERT(aspace);
attr = _get_effect_attr(aspace, varea);
map = rt_hw_mmu_map(aspace, v_addr, p_addr, store_sz, attr);
if (!map)
{
LOG_W("%s: MMU mapping failed for va %p to %p of %lx", __func__,
msg->fault_vaddr, store + PV_OFFSET, store_sz);
}
else
{
rt_hw_tlb_invalidate_range(varea->aspace, v_addr, store_sz, ARCH_PAGE_SIZE);
err = RT_EOK;
}
}
}
else if (msg->response.status == MM_FAULT_STATUS_OK_MAPPED)
{
if (rt_hw_mmu_v2p(varea->aspace, msg->fault_vaddr) == ARCH_MAP_FAILED)
{
LOG_D("%s: no page is mapped on %p", __func__, msg->fault_vaddr);
}
err = RT_EOK;
}
else
{
LOG_W("%s: failed on va %p inside varea %p(%s)", __func__, msg->fault_vaddr, varea,
varea->mem_obj->get_name ? varea->mem_obj->get_name(varea) : "unknow");
}
return err;
}
/* allocate memory page for mapping range */
static int _do_prefetch(rt_aspace_t aspace, rt_varea_t varea, void *start,
rt_size_t size)
{
int err = RT_EOK;
/* it's ensured by caller that start & size ara page-aligned */
char *end = (char *)start + size;
char *vaddr = start;
rt_size_t off = varea->offset + ((vaddr - (char *)varea->start) >> ARCH_PAGE_SHIFT);
while (vaddr != end)
{
/* TODO try to map with huge TLB, when flag & HUGEPAGE */
struct rt_aspace_fault_msg msg;
_do_page_fault(&msg, off, vaddr, varea->mem_obj, varea);
if (rt_varea_map_with_msg(varea, &msg))
{
err = -RT_ENOMEM;
break;
}
/**
* It's hard to identify the mapping pattern on a customized handler
* So we terminate the prefetch process on that case
*/
if (msg.response.status == MM_FAULT_STATUS_OK_MAPPED)
break;
vaddr += msg.response.size;
off += msg.response.size >> ARCH_PAGE_SHIFT;
}
return err;
}
static rt_err_t _expand_varea(rt_varea_t varea, void *new_va, rt_size_t size)
{
rt_err_t error;
rt_aspace_t aspace;
void *old_va;
if (varea->mem_obj && varea->mem_obj->on_varea_expand)
error = varea->mem_obj->on_varea_expand(varea, new_va, size);
else
error = -RT_EPERM;
if (error == RT_EOK)
{
aspace = varea->aspace;
old_va = varea->start;
varea->size = size;
if (old_va != new_va)
{
varea->start = new_va;
varea->offset += ((long)new_va - (long)old_va) >> MM_PAGE_SHIFT;
_aspace_bst_remove(aspace, varea);
_aspace_bst_insert(aspace, varea);
}
}
return error;
}
struct _mapping_property {
rt_size_t attr;
rt_size_t flags;
rt_size_t offset;
struct rt_mem_obj *mem_obj;
};
#define INIT_PROP(obj,off,fl,attr) \
{.mem_obj = (obj), \
.offset = (off), \
.flags = (fl), \
.attr = (attr),}
static rt_bool_t _contiguous_offset(rt_varea_t neighbour, rt_size_t map_size,
struct _mapping_property *prop)
{
rt_size_t n_off = neighbour->offset;
rt_size_t map_off = prop->offset;
return n_off < map_off ?
n_off + (neighbour->size >> MM_PAGE_SHIFT) == map_off :
map_off + (map_size >> MM_PAGE_SHIFT) == n_off;
}
static rt_bool_t _compatible(rt_varea_t neighbour, rt_size_t map_size,
struct _mapping_property *prop)
{
return (prop->attr == neighbour->attr && prop->flags == neighbour->flag &&
prop->mem_obj == neighbour->mem_obj &&
_contiguous_offset(neighbour, map_size, prop));
}
rt_inline rt_err_t _migrate_and_release_varea(rt_aspace_t aspace, rt_varea_t to, rt_varea_t from,
rt_err_t (*on_varea_merge)(struct rt_varea *to, struct rt_varea *from))
{
rt_err_t error;
error = on_varea_merge(to, from);
if (error == RT_EOK)
{
/* uninstall operand & release the varea */
_aspace_bst_remove(aspace, from);
if (!(from->flag & MMF_STATIC_ALLOC))
rt_free(from);
to->size += from->size;
}
return error;
}
static rt_varea_t _merge_surrounding(rt_aspace_t aspace, rt_varea_t operand,
struct _mapping_property *prop)
{
int again;
rt_err_t error;
int can_merge_fw;
int can_merge_bw;
rt_varea_t neighbour;
char *operand_start;
size_t operand_size;
rt_err_t (*on_varea_merge)(struct rt_varea *to, struct rt_varea *from);
if (operand->mem_obj && operand->mem_obj->on_varea_merge)
{
on_varea_merge = operand->mem_obj->on_varea_merge;
do {
operand_start = operand->start;
operand_size = operand->size;
LOG_D("search op_start=%p,op_size=0x%lx", operand_start, operand_size);
/* find a compatible neighbour if any and setup direction */
can_merge_fw = can_merge_bw = 0;
neighbour = _aspace_bst_search(aspace, operand_start - 1);
if (!neighbour || !_compatible(neighbour, operand_size, prop))
{
neighbour = _aspace_bst_search(aspace, operand_start + operand_size);
if (neighbour && _compatible(neighbour, operand_size, prop))
can_merge_bw = 1;
}
else
can_merge_fw = 1;
if (can_merge_fw || can_merge_bw)
{
/* merge operand with its predecessor or successor */
if (can_merge_fw)
{
error = _migrate_and_release_varea(aspace, neighbour, operand, on_varea_merge);
operand = neighbour;
}
else
error = _migrate_and_release_varea(aspace, operand, neighbour, on_varea_merge);
if (error == RT_EOK)
again = 1;
}
else
again = 0;
} while (again);
}
return operand;
}
/**
* Brief: expand and merge surrounding until not possible and
* setup the pvarea if new virt address region is installed
*/
static rt_bool_t _try_expand_and_merge_okay(rt_aspace_t aspace, rt_varea_t *pvarea,
void *alloc_va, rt_mm_va_hint_t hint,
struct _mapping_property *prop)
{
int can_expand_fw;
int can_expand_bw;
rt_varea_t neighbour;
rt_varea_t new_region_at = RT_NULL;
rt_bool_t install_ok = RT_FALSE;
char *operand_start = alloc_va;
size_t operand_size = hint->map_size;
/* find a compatible neighbour if any and setup direction */
LOG_D("search op_start=%p,op_size=0x%lx", operand_start, operand_size);
can_expand_fw = can_expand_bw = 0;
neighbour = _aspace_bst_search(aspace, operand_start - 1);
if (!neighbour || !_compatible(neighbour, operand_size, prop))
{
neighbour = _aspace_bst_search(aspace, operand_start + operand_size);
if (neighbour && _compatible(neighbour, operand_size, prop))
can_expand_bw = 1;
}
else
can_expand_fw = 1;
if (can_expand_fw || can_expand_bw)
{
/* expand varea at head or tailing */
if (can_expand_fw)
operand_start = neighbour->start;
operand_size += neighbour->size;
LOG_D("expand op_start=%p,op_size=0x%lx", operand_start, operand_size);
if (_expand_varea(neighbour, operand_start, operand_size) == RT_EOK)
{
new_region_at = _merge_surrounding(aspace, neighbour, prop);
*pvarea = new_region_at;
install_ok = RT_TRUE;
}
}
return install_ok;
}
static rt_varea_t _varea_create(void *start, rt_size_t size);
static int _insert_new_varea(rt_aspace_t aspace, rt_varea_t *pvarea,
void *alloc_va, rt_mm_va_hint_t hint)
{
int err;
rt_varea_t varea = *pvarea;
if (varea == RT_NULL)
{
/* no preallocate buffer is provided, then create one */
varea = _varea_create(hint->prefer, hint->map_size);
hint->flags &= ~MMF_STATIC_ALLOC;
*pvarea = varea;
}
if (varea)
{
varea->start = alloc_va;
_aspace_bst_insert(aspace, varea);
err = RT_EOK;
}
else
{
LOG_W("%s: Out of memory", __func__);
err = -RT_ENOMEM;
}
return err;
}
static inline void _varea_post_install(rt_varea_t varea, rt_aspace_t aspace,
rt_size_t attr, rt_size_t flags,
rt_mem_obj_t mem_obj, rt_size_t offset)
{
varea->aspace = aspace;
varea->attr = attr;
varea->mem_obj = mem_obj;
varea->flag = flags;
varea->offset = offset;
varea->frames = NULL;
if (varea->mem_obj && varea->mem_obj->on_varea_open)
varea->mem_obj->on_varea_open(varea);
}
/**
* Install new virtual address region into address space
* The pvarea will be set to the varea where new virt memory installed which can
* be a newly created or existed one.
*
* Note: caller must hold the aspace lock
*/
static int _varea_install(rt_aspace_t aspace, rt_varea_t *pvarea,
rt_mm_va_hint_t hint, struct _mapping_property *prop,
void **pva)
{
void *alloc_va;
int err = RT_EOK;
if (hint->flags & MMF_MAP_FIXED)
{
alloc_va = hint->prefer;
err = _unmap_range_locked(aspace, alloc_va, hint->map_size);
if (err != RT_EOK)
{
/* Note: MAP_FIXED must failed if unable to unmap existing mapping */
LOG_I("%s: unmap range failed in %p with size 0x%lx, error=%d", __func__, alloc_va, hint->map_size, err);
}
}
else
{
alloc_va =
_find_free(aspace, hint->prefer, hint->map_size, hint->limit_start,
hint->limit_range_size, hint->flags);
if (alloc_va == RT_NULL)
err = -RT_ENOSPC;
}
if (alloc_va != RT_NULL)
{
/* TODO: fix to private mapping directly */
if (!_try_expand_and_merge_okay(aspace, pvarea, alloc_va, hint, prop))
{
err = _insert_new_varea(aspace, pvarea, alloc_va, hint);
if (err == RT_EOK)
_varea_post_install(*pvarea, aspace, prop->attr, prop->flags,
prop->mem_obj, prop->offset);
}
if (err == RT_EOK)
{
RT_ASSERT(*pvarea);
*pva = alloc_va;
}
}
return err;
}
/**
* restore context modified by varea install
*/
void _varea_uninstall_locked(rt_varea_t varea)
{
rt_aspace_t aspace = varea->aspace;
if (varea->mem_obj && varea->mem_obj->on_varea_close)
varea->mem_obj->on_varea_close(varea);
rt_hw_mmu_unmap(aspace, varea->start, varea->size);
rt_hw_tlb_invalidate_range(aspace, varea->start, varea->size, ARCH_PAGE_SIZE);
rt_varea_pgmgr_pop_all(varea);
_aspace_bst_remove(aspace, varea);
}
int _mm_aspace_map(rt_aspace_t aspace, rt_varea_t *pvarea, void **addr,
rt_size_t length, rt_size_t attr, mm_flag_t flags,
rt_mem_obj_t mem_obj, rt_size_t offset)
{
int err = RT_EOK;
rt_varea_t varea;
struct _mapping_property prop = INIT_PROP(mem_obj, offset, flags, attr);
WR_LOCK(aspace);
/**
* @brief .prefer & .map_size are scratched from varea which setup by caller
* .limit_start & .limit_range_size have default to be in range of aspace
* .flags is from parameter, and will be fill in varea if install successfully
*/
struct rt_mm_va_hint hint = {.prefer = *addr,
.map_size = length,
.limit_start = aspace->start,
.limit_range_size = aspace->size,
.flags = flags};
if (mem_obj->hint_free)
{
/* mem object can control mapping range and so by modifing hint */
mem_obj->hint_free(&hint);
}
/* try to allocate a virtual address region for varea */
err = _varea_install(aspace, pvarea, &hint, &prop, addr);
if (err == RT_EOK)
{
varea = *pvarea;
if (MMF_TEST_CNTL(flags, MMF_PREFETCH))
{
/* do the MMU & TLB business */
err = _do_prefetch(aspace, varea, varea->start, varea->size);
if (err)
{
LOG_I("%s: failed to prefetch page into varea(%s)",
__func__, VAREA_NAME(varea));
/* restore data structure and MMU */
_varea_uninstall_locked(varea);
if (!(varea->flag & MMF_STATIC_ALLOC))
rt_free(varea);
}
}
}
WR_UNLOCK(aspace);
return err;
}
static rt_varea_t _varea_create(void *start, rt_size_t size)
{
rt_varea_t varea;
varea = (rt_varea_t)rt_malloc(sizeof(struct rt_varea));
if (varea)
{
varea->start = start;
varea->size = size;
}
return varea;
}
#define _IS_OVERFLOW(start, length) ((length) > (0ul - (uintptr_t)(start)))
#define _IS_OVERSIZE(start, length, limit_s, limit_sz) (((length) + (rt_size_t)((char *)(start) - (char *)(limit_start))) > (limit_size))
static inline int _not_in_range(void *start, rt_size_t length,
void *limit_start, rt_size_t limit_size)
{
/* assuming (base + length) will not overflow except (0) */
int rc = start != RT_NULL
? (_IS_OVERFLOW(start, length) || start < limit_start ||
_IS_OVERSIZE(start, length, limit_start, limit_size))
: length > limit_size;
if (rc)
LOG_D("%s: [%p : %p] [%p : %p]", __func__, start, length, limit_start, limit_size);
return rc;
}
static inline int _not_align(void *start, rt_size_t length, rt_size_t mask)
{
return (start != RT_NULL) &&
(((uintptr_t)start & mask) || (length & mask));
}
/** if the flag is currently supported */
static inline int _not_support(rt_size_t flags)
{
rt_size_t support_ops = MMF_CREATE(((__MMF_INVALID - 1) << 1) - 1, 1);
return flags & ~(support_ops);
}
int rt_aspace_map(rt_aspace_t aspace, void **addr, rt_size_t length,
rt_size_t attr, mm_flag_t flags, rt_mem_obj_t mem_obj,
rt_size_t offset)
{
int err;
rt_varea_t varea = RT_NULL;
RT_DEBUG_SCHEDULER_AVAILABLE(1);
if (!aspace || !addr || !mem_obj || length == 0)
{
err = -RT_EINVAL;
LOG_I("%s(%p, %p, %lx, %lx, %lx, %p, %lx): Invalid input",
__func__, aspace, addr, length, attr, flags, mem_obj, offset);
}
else if (_not_in_range(*addr, length, aspace->start, aspace->size))
{
err = -RT_EINVAL;
LOG_I("%s(addr:%p, len:%lx): out of range", __func__, *addr, length);
}
else if (_not_support(flags))
{
LOG_I("%s: no support flags 0x%lx", __func__, flags);
err = -RT_ENOSYS;
}
else
{
RT_ASSERT((length & ARCH_PAGE_MASK) == 0);
RT_ASSERT(((long)*addr & ARCH_PAGE_MASK) == 0);
err = _mm_aspace_map(aspace, &varea, addr, length, attr, flags, mem_obj, offset);
}
if (err != RT_EOK)
{
*addr = NULL;
}
return err;
}
int rt_aspace_map_static(rt_aspace_t aspace, rt_varea_t varea, void **addr,
rt_size_t length, rt_size_t attr, mm_flag_t flags,
rt_mem_obj_t mem_obj, rt_size_t offset)
{
int err;
if (!aspace || !varea || !addr || !mem_obj || length == 0 ||
_not_in_range(*addr, length, aspace->start, aspace->size))
{
err = -RT_EINVAL;
LOG_W("%s: Invalid input", __func__);
}
else if (_not_support(flags))
{
LOG_W("%s: no support flags", __func__);
err = -RT_ENOSYS;
}
else
{
varea->size = length;
varea->start = *addr;
flags |= MMF_STATIC_ALLOC;
/**
* todo: fix if mapping expand, the static varea is not used at all
*/
err = _mm_aspace_map(aspace, &varea, addr, length, attr, flags, mem_obj, offset);
}
if (err != RT_EOK)
{
*addr = NULL;
}
else
{
*addr = varea->start;
}
return err;
}
int _mm_aspace_map_phy(rt_aspace_t aspace, rt_varea_t varea,
rt_mm_va_hint_t hint, rt_size_t attr, rt_size_t pa_off,
void **ret_va)
{
int err;
void *vaddr;
if (!aspace || !hint || !hint->limit_range_size || !hint->map_size)
{
LOG_W("%s: Invalid input", __func__);
err = -RT_EINVAL;
}
else if (_not_align(hint->prefer, hint->map_size, ARCH_PAGE_MASK))
{
LOG_W("%s: not aligned", __func__);
err = -RT_EINVAL;
}
else if (_not_in_range(hint->limit_start, hint->limit_range_size, aspace->start,
aspace->size) ||
_not_in_range(hint->prefer, hint->map_size, aspace->start,
aspace->size))
{
LOG_W("%s: not in range", __func__);
err = -RT_EINVAL;
}
else
{
struct _mapping_property prop = INIT_PROP(0, pa_off, hint->flags, attr);
WR_LOCK(aspace);
err = _varea_install(aspace, &varea, hint, &prop, &vaddr);
if (err == RT_EOK)
{
err = _do_named_map(aspace, varea, varea->start, varea->size,
(rt_size_t)pa_off, attr);
if (err != RT_EOK)
{
_varea_uninstall_locked(varea);
}
}
WR_UNLOCK(aspace);
}
if (ret_va)
{
if (err == RT_EOK)
*ret_va = vaddr;
else
*ret_va = RT_NULL;
}
return err;
}
int rt_aspace_map_phy(rt_aspace_t aspace, rt_mm_va_hint_t hint, rt_size_t attr,
rt_size_t pa_off, void **ret_va)
{
int err;
if (hint)
{
rt_varea_t varea = _varea_create(hint->prefer, hint->map_size);
if (varea)
{
hint->flags &= ~MMF_STATIC_ALLOC;
err = _mm_aspace_map_phy(aspace, varea, hint, attr, pa_off, ret_va);
if (err != RT_EOK)
{
rt_free(varea);
}
}
else
{
err = -RT_ENOMEM;
}
}
else
{
err = -RT_EINVAL;
}
return err;
}
int rt_aspace_map_phy_static(rt_aspace_t aspace, rt_varea_t varea,
rt_mm_va_hint_t hint, rt_size_t attr,
rt_size_t pa_off, void **ret_va)
{
int err;
if (varea && hint)
{
varea->start = hint->prefer;
varea->size = hint->map_size;
hint->flags |= (MMF_STATIC_ALLOC);
LOG_D("%s: start %p size %p phy at %p", __func__, varea->start, varea->size, pa_off << MM_PAGE_SHIFT);
err = _mm_aspace_map_phy(aspace, varea, hint, attr, pa_off, ret_va);
}
else
{
err = -RT_EINVAL;
}
return err;
}
int _aspace_unmap(rt_aspace_t aspace, void *addr)
{
int error;
rt_varea_t varea;
WR_LOCK(aspace);
varea = _aspace_bst_search(aspace, addr);
if (varea == RT_NULL)
{
LOG_D("%s: No such entry found at %p\n", __func__, addr);
error = -RT_ENOENT;
}
else
{
_varea_uninstall_locked(varea);
if (!(varea->flag & MMF_STATIC_ALLOC))
{
rt_free(varea);
}
error = RT_EOK;
}
WR_UNLOCK(aspace);
return error;
}
int rt_aspace_unmap(rt_aspace_t aspace, void *addr)
{
int error;
if (!aspace)
{
LOG_I("%s: Invalid input", __func__);
error = -RT_EINVAL;
}
else if (_not_in_range(addr, 1, aspace->start, aspace->size))
{
LOG_I("%s: %lx not in range of aspace[%lx:%lx]", __func__, addr,
aspace->start, (char *)aspace->start + aspace->size);
error = -RT_EINVAL;
}
else
{
error = _aspace_unmap(aspace, addr);
}
return error;
}
/**
* modify the property of existed varea by shrink its size. Mem_obj is
* notified to released the resource.
*/
static rt_err_t _shrink_varea(rt_varea_t varea, void *new_va, rt_size_t size)
{
rt_err_t error;
rt_aspace_t aspace;
void *old_va;
if (varea->mem_obj && varea->mem_obj->on_varea_shrink)
error = varea->mem_obj->on_varea_shrink(varea, new_va, size);
else
error = -RT_EPERM;
if (error == RT_EOK)
{
aspace = varea->aspace;
old_va = varea->start;
varea->size = size;
if (old_va != new_va)
{
varea->start = new_va;
varea->offset += ((long)new_va - (long)old_va) >> MM_PAGE_SHIFT;
_aspace_bst_remove(aspace, varea);
_aspace_bst_insert(aspace, varea);
}
}
return error;
}
static rt_err_t _split_varea(rt_varea_t existed, char *ex_end, char *unmap_start, char *unmap_end, rt_size_t unmap_len)
{
int error;
size_t rela_offset;
rt_varea_t subset;
char *subset_start;
size_t subset_size;
if (existed->mem_obj && existed->mem_obj->on_varea_split)
{
subset_start = unmap_end;
subset_size = ex_end - subset_start;
subset = _varea_create(subset_start, subset_size);
if (subset)
{
rela_offset = MM_PA_TO_OFF(subset_start - (char *)existed->start);
subset->aspace = existed->aspace;
subset->attr = existed->attr;
subset->mem_obj = existed->mem_obj;
subset->flag = existed->flag & ~MMF_STATIC_ALLOC;
subset->offset = existed->offset + rela_offset;
subset->frames = NULL;
error = existed->mem_obj->on_varea_split(existed, unmap_start, unmap_len, subset);
if (error == RT_EOK)
{
existed->size = unmap_start - (char *)existed->start;
_aspace_bst_insert(existed->aspace, subset);
}
if (error != RT_EOK)
rt_free(subset);
}
else
error = -RT_ENOMEM;
}
else
error = -RT_EPERM;
return error;
}
/* remove overlapped pages from varea */
static int _remove_overlapped_varea(rt_varea_t existed, char *unmap_start, rt_size_t unmap_len)
{
int error;
char *ex_start = existed->start;
char *ex_end = ex_start + existed->size;
char *unmap_end = unmap_start + unmap_len;
if (ex_start < unmap_start)
{
if (ex_end > unmap_end)
error = _split_varea(existed, ex_end, unmap_start, unmap_end, unmap_len);
else
error = _shrink_varea(existed, ex_start, unmap_start - ex_start);
}
else if (ex_end > unmap_end)
error = _shrink_varea(existed, unmap_end, ex_end - unmap_end);
else
{
_varea_uninstall_locked(existed);
if (VAREA_NOT_STATIC(existed))
{
rt_free(existed);
}
error = RT_EOK;
}
return error;
}
static int _unmap_range_locked(rt_aspace_t aspace, void *addr, size_t length)
{
int error = RT_EOK;
rt_varea_t existed;
struct _mm_range unmap_range;
unmap_range.start = addr;
unmap_range.end = addr + length - 1;
existed = _aspace_bst_search_overlap(aspace, unmap_range);
while (existed)
{
error = _remove_overlapped_varea(existed, addr, length);
if (error == RT_EOK)
existed = _aspace_bst_search_overlap(aspace, unmap_range);
else
break;
}
return error;
}
int rt_aspace_unmap_range(rt_aspace_t aspace, void *addr, size_t length)
{
int error;
if (!aspace)
{
LOG_I("%s: Invalid input", __func__);
error = -RT_EINVAL;
}
else if (_not_in_range(addr, length, aspace->start, aspace->size))
{
LOG_I("%s: %lx not in range of aspace[%lx:%lx]", __func__, addr,
aspace->start, (char *)aspace->start + aspace->size);
error = -RT_EINVAL;
}
else if (!ALIGNED(addr))
{
LOG_I("%s(addr=%p): Unaligned address", __func__, addr);
error = -RT_EINVAL;
}
else
{
/**
* Brief: re-arrange the address space to remove existing pages mapping
* in [unmap_start, unmap_start + unmap_len)
*/
length = RT_ALIGN(length, ARCH_PAGE_SIZE);
WR_LOCK(aspace);
error = _unmap_range_locked(aspace, addr, length);
WR_UNLOCK(aspace);
}
return error;
}
static inline void *_lower(void *a, void *b)
{
return a < b ? a : b;
}
static inline void *_align(void *va, rt_ubase_t align_mask)
{
return (void *)((rt_ubase_t)((char *)va + ~align_mask) & align_mask);
}
static void *_ascending_search(rt_varea_t varea, rt_size_t req_size,
rt_ubase_t align_mask, struct _mm_range limit)
{
void *ret = RT_NULL;
while (varea && varea->start < limit.end)
{
char *candidate = (char *)varea->start + varea->size;
candidate = _align(candidate, align_mask);
if (candidate > (char *)limit.end || (char *)limit.end - candidate + 1 < req_size)
break;
rt_varea_t nx_va = ASPACE_VAREA_NEXT(varea);
if (nx_va)
{
rt_size_t gap_size =
(char *)_lower(limit.end, (char *)nx_va->start - 1) - candidate + 1;
if (gap_size >= req_size)
{
ret = candidate;
break;
}
}
else
{
ret = candidate;
}
varea = nx_va;
}
return ret;
}
/** find suitable place in [limit_start, limit_end] */
static void *_find_head_and_asc_search(rt_aspace_t aspace, rt_size_t req_size,
rt_ubase_t align_mask,
struct _mm_range limit)
{
void *va = RT_NULL;
rt_varea_t varea = _aspace_bst_search_exceed(aspace, limit.start);
if (varea)
{
char *candidate = _align(limit.start, align_mask);
rt_size_t gap_size = (char *)varea->start - candidate;
if (gap_size >= req_size)
{
rt_varea_t former = _aspace_bst_search(aspace, limit.start);
if (former)
{
candidate = _align((char *)former->start + former->size, align_mask);
gap_size = (char *)varea->start - candidate;
if (gap_size >= req_size)
va = candidate;
else
va = _ascending_search(varea, req_size, align_mask, limit);
}
else
{
va = candidate;
}
}
else
{
va = _ascending_search(varea, req_size, align_mask, limit);
}
}
else
{
char *candidate;
rt_size_t gap_size;
candidate = limit.start;
candidate = _align(candidate, align_mask);
gap_size = (char *)limit.end - candidate + 1;
if (gap_size >= req_size)
va = candidate;
}
return va;
}
static void *_find_free(rt_aspace_t aspace, void *prefer, rt_size_t req_size,
void *limit_start, rt_size_t limit_size,
mm_flag_t flags)
{
rt_varea_t varea = NULL;
void *va = RT_NULL;
struct _mm_range limit = {limit_start, (char *)limit_start + limit_size - 1};
rt_ubase_t align_mask = ~0ul;
if (flags & MMF_REQUEST_ALIGN)
{
align_mask = ~((1 << MMF_GET_ALIGN(flags)) - 1);
}
if (prefer != RT_NULL)
{
/* if prefer and free, just return the prefer region */
prefer = _align(prefer, align_mask);
struct _mm_range range = {prefer, (char *)prefer + req_size - 1};
varea = _aspace_bst_search_overlap(aspace, range);
if (!varea)
{
va = prefer;
}
else if (flags & MMF_MAP_FIXED)
{
/* OVERLAP */
}
else
{
/* search from `varea` in ascending order */
va = _ascending_search(varea, req_size, align_mask, limit);
if (va == RT_NULL)
{
/* rewind to first range */
limit.end = (char *)varea->start - 1;
va = _find_head_and_asc_search(aspace, req_size, align_mask,
limit);
}
}
}
else
{
va = _find_head_and_asc_search(aspace, req_size, align_mask, limit);
}
return va;
}
int rt_aspace_load_page(rt_aspace_t aspace, void *addr, rt_size_t npage)
{
int err = RT_EOK;
rt_varea_t varea;
char *end = (char *)addr + (npage << ARCH_PAGE_SHIFT);
WR_LOCK(aspace);
varea = _aspace_bst_search(aspace, addr);
WR_UNLOCK(aspace);
if (!varea)
{
LOG_W("%s: varea not exist", __func__);
err = -RT_ENOENT;
}
else if ((char *)addr >= end || (rt_size_t)addr & ARCH_PAGE_MASK ||
_not_in_range(addr, npage << ARCH_PAGE_SHIFT, varea->start,
varea->size))
{
LOG_W("%s: Unaligned parameter or out of range", __func__);
err = -RT_EINVAL;
}
else
{
err = _do_prefetch(aspace, varea, addr, npage << ARCH_PAGE_SHIFT);
}
return err;
}
int rt_varea_map_page(rt_varea_t varea, void *vaddr, void *page)
{
int err = RT_EOK;
void *page_pa = rt_kmem_v2p(page);
if (!varea || !vaddr || !page)
{
LOG_W("%s(%p,%p,%p): invalid input", __func__, varea, vaddr, page);
err = -RT_EINVAL;
}
else if (page_pa == ARCH_MAP_FAILED)
{
LOG_W("%s: page is not in kernel space", __func__);
err = -RT_ERROR;
}
else if (_not_in_range(vaddr, ARCH_PAGE_SIZE, varea->start, varea->size))
{
LOG_W("%s(%p,%lx): not in range of varea(%p,%lx)", __func__,
vaddr, ARCH_PAGE_SIZE, varea->start, varea->size);
err = -RT_EINVAL;
}
else
{
err = _do_named_map(
varea->aspace,
varea,
vaddr,
ARCH_PAGE_SIZE,
MM_PA_TO_OFF(page_pa),
varea->attr
);
}
return err;
}
int rt_varea_unmap_page(rt_varea_t varea, void *vaddr)
{
void *va_aligned = (void *)RT_ALIGN_DOWN((rt_base_t)vaddr, ARCH_PAGE_SIZE);
return rt_varea_unmap_range(varea, va_aligned, ARCH_PAGE_SIZE);
}
/**
* @note Caller should take care of synchronization of its varea among all the map/unmap operation
*/
int rt_varea_map_range(rt_varea_t varea, void *vaddr, void *paddr, rt_size_t length)
{
int err;
if (!varea || !vaddr || !paddr || !length ||
!ALIGNED(vaddr) || !ALIGNED(paddr) || !(ALIGNED(length)))
{
LOG_W("%s(%p,%p,%p,%lx): invalid input", __func__, varea, vaddr, paddr, length);
err = -RT_EINVAL;
}
else if (_not_in_range(vaddr, length, varea->start, varea->size))
{
LOG_W("%s(%p,%lx): not in range of varea(%p,%lx)", __func__,
vaddr, length, varea->start, varea->size);
err = -RT_EINVAL;
}
else
{
err = _do_named_map(
varea->aspace,
varea,
vaddr,
length,
MM_PA_TO_OFF(paddr),
varea->attr
);
}
return err;
}
/**
* @note Caller should take care of synchronization of its varea among all the map/unmap operation
*/
int rt_varea_unmap_range(rt_varea_t varea, void *vaddr, rt_size_t length)
{
int err;
rt_base_t va_align;
if (!varea || !vaddr || !length)
{
LOG_W("%s(%p,%p,%lx): invalid input", __func__, varea, vaddr, length);
err = -RT_EINVAL;
}
else if (_not_in_range(vaddr, length, varea->start, varea->size))
{
LOG_W("%s(%p,%lx): not in range of varea(%p,%lx)", __func__,
vaddr, length, varea->start, varea->size);
err = -RT_EINVAL;
}
else
{
va_align = RT_ALIGN_DOWN((rt_base_t)vaddr, ARCH_PAGE_SIZE);
rt_hw_mmu_unmap(varea->aspace, (void *)va_align, length);
rt_hw_tlb_invalidate_range(varea->aspace, (void *)va_align, length, ARCH_PAGE_SIZE);
err = RT_EOK;
}
return err;
}
int rt_aspace_offload_page(rt_aspace_t aspace, void *addr, rt_size_t npage)
{
return -RT_ENOSYS;
}
int rt_aspace_control(rt_aspace_t aspace, void *addr, enum rt_mmu_cntl cmd)
{
int err;
rt_varea_t varea;
WR_LOCK(aspace);
varea = _aspace_bst_search(aspace, addr);
WR_UNLOCK(aspace);
if (varea)
{
err = rt_hw_mmu_control(aspace, varea->start, varea->size, cmd);
if (err == RT_EOK)
{
rt_hw_tlb_invalidate_range(aspace, varea->start, varea->size, ARCH_PAGE_SIZE);
}
}
else
{
err = -RT_ENOENT;
}
return err;
}
int rt_aspace_traversal(rt_aspace_t aspace,
int (*fn)(rt_varea_t varea, void *arg), void *arg)
{
rt_varea_t varea;
WR_LOCK(aspace);
varea = ASPACE_VAREA_FIRST(aspace);
while (varea)
{
fn(varea, arg);
varea = ASPACE_VAREA_NEXT(varea);
}
WR_UNLOCK(aspace);
return 0;
}
static int _dump(rt_varea_t varea, void *arg)
{
if (varea->mem_obj && varea->mem_obj->get_name)
{
rt_kprintf("[%p - %p] %s\n", varea->start, (char *)varea->start + varea->size,
varea->mem_obj->get_name(varea));
}
else
{
rt_kprintf("[%p - %p] phy-map\n", varea->start, (char *)varea->start + varea->size);
rt_kprintf("\t\\_ paddr = %p\n", varea->offset << MM_PAGE_SHIFT);
}
return 0;
}
void rt_aspace_print_all(rt_aspace_t aspace)
{
rt_aspace_traversal(aspace, _dump, NULL);
}
static int _count_vsz(rt_varea_t varea, void *arg)
{
rt_base_t *pvsz = arg;
RT_ASSERT(varea);
*pvsz = *pvsz + varea->size;
return 0;
}
rt_base_t rt_aspace_count_vsz(rt_aspace_t aspace)
{
rt_base_t vsz = 0;
rt_aspace_traversal(aspace, _count_vsz, &vsz);
return vsz;
}
static int _dup_varea(rt_varea_t src_varea, void *arg)
{
int err;
rt_aspace_t dst = arg;
rt_aspace_t src = src_varea->aspace;
void *pa = RT_NULL;
void *va = RT_NULL;
rt_mem_obj_t mem_obj = src_varea->mem_obj;
if (!mem_obj)
{
/* duplicate a physical mapping */
pa = rt_hw_mmu_v2p(src, (void *)src_varea->start);
RT_ASSERT(pa != ARCH_MAP_FAILED);
struct rt_mm_va_hint hint = {.flags = src_varea->flag,
.limit_range_size = dst->size,
.limit_start = dst->start,
.prefer = src_varea->start,
.map_size = src_varea->size};
err = rt_aspace_map_phy(dst, &hint, src_varea->attr,
MM_PA_TO_OFF(pa), &va);
if (err != RT_EOK)
{
LOG_W("%s: aspace map failed at %p with size %p", __func__,
src_varea->start, src_varea->size);
}
}
else
{
/* duplicate a mem_obj backing mapping */
rt_base_t flags = src_varea->flag | MMF_MAP_FIXED;
flags &= ~MMF_STATIC_ALLOC;
flags &= ~MMF_PREFETCH;
va = src_varea->start;
err = rt_aspace_map(dst, &va, src_varea->size, src_varea->attr,
flags, mem_obj, src_varea->offset);
if (err != RT_EOK)
{
LOG_W("%s: aspace map failed at %p with size %p", __func__,
src_varea->start, src_varea->size);
}
}
if (va != (void *)src_varea->start)
{
return -1;
}
return 0;
}
struct _compare_param {
rt_aspace_t dst;
int rc;
};
rt_err_t rt_aspace_duplicate_locked(rt_aspace_t src, rt_aspace_t dst)
{
return rt_aspace_traversal(src, _dup_varea, dst);
}
rt_inline int _varea_same(rt_varea_t a, rt_varea_t b)
{
return a->attr == b->attr && a->flag == b->flag && a->mem_obj == b->mem_obj;
}
rt_inline void _dump_varea(rt_varea_t varea)
{
LOG_W("%s(attr=0x%lx, flags=0x%lx, start=0x%lx, size=0x%lx, mem_obj=%p)", VAREA_NAME(varea), varea->attr, varea->flag, varea->start, varea->size, varea->mem_obj);
}
static int _compare_varea(rt_varea_t src_varea, void *arg)
{
struct _compare_param *param = arg;
rt_varea_t dst_varea;
rt_aspace_t dst = param->dst;
rt_aspace_t src = src_varea->aspace;
dst_varea = _aspace_bst_search(dst, src_varea->start);
if (dst_varea)
{
char *buf1 = rt_pages_alloc_ext(0, PAGE_ANY_AVAILABLE);
char *buf2 = rt_pages_alloc_ext(0, PAGE_ANY_AVAILABLE);
char *vend = src_varea->start + src_varea->size;
for (char *i = src_varea->start; i < vend; i += ARCH_PAGE_SIZE)
{
int rc;
rt_aspace_page_get(src, i, buf1);
rt_aspace_page_get(dst, i, buf2);
rc = memcmp(buf1, buf2, ARCH_PAGE_SIZE);
if (rc)
{
if (param->rc == 0)
param->rc = rc;
LOG_E("%s(a_varea=%s, b_varea=%s)", __func__, VAREA_NAME(src_varea), VAREA_NAME(dst_varea));
_dump_varea(src_varea);
_dump_varea(dst_varea);
RT_ASSERT(0);
}
}
rt_pages_free(buf1, 0);
rt_pages_free(buf2, 0);
}
else
{
param->rc = -RT_ENOENT;
}
return 0;
}
rt_err_t rt_aspace_compare(rt_aspace_t src, rt_aspace_t dst)
{
struct _compare_param param = {.rc = 0, .dst = dst};
rt_aspace_traversal(src, _compare_varea, &param);
return param.rc;
}
/* dst are page aligned */
rt_inline rt_err_t _page_put(rt_varea_t varea, void *page_va, void *buffer)
{
struct rt_aspace_io_msg iomsg;
rt_err_t rc;
rt_mm_io_msg_init(&iomsg, VAREA_VA_TO_OFFSET(varea, page_va), page_va, buffer);
varea->mem_obj->page_write(varea, &iomsg);
if (iomsg.response.status == MM_FAULT_STATUS_UNRECOVERABLE)
rc = -RT_ERROR;
else
rc = RT_EOK;
return rc;
}
/* dst are page aligned */
rt_inline rt_err_t _page_get(rt_varea_t varea, void *page_va, void *buffer)
{
struct rt_aspace_io_msg iomsg;
rt_err_t rc;
rt_mm_io_msg_init(&iomsg, VAREA_VA_TO_OFFSET(varea, page_va), page_va, buffer);
varea->mem_obj->page_read(varea, &iomsg);
if (iomsg.response.status == MM_FAULT_STATUS_UNRECOVERABLE)
rc = -RT_ERROR;
else
rc = RT_EOK;
return rc;
}
#ifdef RT_USING_SMART
#include "lwp.h"
rt_inline rt_aspace_t _current_uspace(void)
{
rt_lwp_t this_proc = lwp_self();
return this_proc ? this_proc->aspace : RT_NULL;
}
#else
rt_inline rt_aspace_t _current_uspace(void)
{
return RT_NULL;
}
#endif
rt_err_t rt_aspace_page_get_phy(rt_aspace_t aspace, void *page_va, void *buffer)
{
rt_err_t rc = -RT_ERROR;
char *frame_ka = rt_hw_mmu_v2p(aspace, page_va);
if (frame_ka != ARCH_MAP_FAILED)
{
frame_ka = rt_kmem_p2v(frame_ka);
if (frame_ka)
{
rt_memcpy(buffer, frame_ka, ARCH_PAGE_SIZE);
rc = RT_EOK;
}
else if (aspace == _current_uspace() || aspace == &rt_kernel_space)
{
/* direct IO */
rt_memcpy(buffer, page_va, ARCH_PAGE_SIZE);
rc = RT_EOK;
}
else
{
/* user memory region remap ? */
LOG_W("%s(aspace=0x%lx,va=%p): Operation not support",
__func__, aspace, page_va);
rc = -RT_ENOSYS;
}
}
else
{
LOG_W("%s(aspace=0x%lx,va=%p): PTE not existed",
__func__, aspace, page_va);
rc = -RT_ENOENT;
}
return rc;
}
rt_err_t rt_aspace_page_put_phy(rt_aspace_t aspace, void *page_va, void *buffer)
{
rt_err_t rc = -RT_ERROR;
char *frame_ka = rt_hw_mmu_v2p(aspace, page_va);
if (frame_ka != ARCH_MAP_FAILED)
{
frame_ka = rt_kmem_p2v(frame_ka);
if (frame_ka)
{
rt_memcpy(frame_ka, buffer, ARCH_PAGE_SIZE);
rc = RT_EOK;
}
else if (aspace == _current_uspace() || aspace == &rt_kernel_space)
{
/* direct IO */
rt_memcpy(page_va, buffer, ARCH_PAGE_SIZE);
rc = RT_EOK;
}
else
{
/* user memory region remap ? */
LOG_W("%s(aspace=0x%lx,va=%p): Operation not support",
__func__, aspace, page_va);
rc = -RT_ENOSYS;
}
}
else
{
LOG_W("%s(aspace=0x%lx,va=%p): PTE not existed",
__func__, aspace, page_va);
rc = -RT_ENOENT;
}
return rc;
}
rt_err_t rt_aspace_page_put(rt_aspace_t aspace, void *page_va, void *buffer)
{
rt_err_t rc = -RT_ERROR;
rt_varea_t varea;
RT_ASSERT(aspace);
RD_LOCK(aspace);
varea = _aspace_bst_search(aspace, page_va);
if (varea && ALIGNED(page_va))
{
if (varea->mem_obj)
{
if (varea->mem_obj->page_write)
{
if (rt_varea_is_private_locked(varea))
{
RDWR_LOCK(aspace);
struct rt_aspace_fault_msg msg;
msg.fault_op = MM_FAULT_OP_WRITE;
msg.fault_type = MM_FAULT_TYPE_ACCESS_FAULT;
msg.fault_vaddr = page_va;
rc = rt_varea_fix_private_locked(varea, rt_hw_mmu_v2p(aspace, page_va),
&msg, RT_TRUE);
RDWR_UNLOCK(aspace);
if (rc == MM_FAULT_FIXABLE_TRUE)
{
varea = _aspace_bst_search(aspace, page_va);
rc = _page_put(varea, page_va, buffer);
}
else
rc = -RT_ERROR;
}
else
rc = _page_put(varea, page_va, buffer);
}
else
{
rc = -RT_EINVAL;
LOG_I("%s: Operation not allowed", __func__);
}
}
else
{
rc = rt_aspace_page_put_phy(aspace, page_va, buffer);
}
}
else
rc = -RT_EINVAL;
RD_UNLOCK(aspace);
return rc;
}
rt_err_t rt_aspace_page_get(rt_aspace_t aspace, void *page_va, void *buffer)
{
rt_err_t rc = -RT_ERROR;
rt_varea_t varea;
/* TODO: cache the last search item */
RT_ASSERT(aspace);
RD_LOCK(aspace);
varea = _aspace_bst_search(aspace, page_va);
if (varea && ALIGNED(page_va))
{
if (varea->mem_obj)
{
if (varea->mem_obj->page_read)
{
rc = _page_get(varea, page_va, buffer);
}
else
{
LOG_I("%s: Operation not allowed", __func__);
}
}
else
{
rc = rt_aspace_page_get_phy(aspace, page_va, buffer);
}
}
else
{
rc = -RT_EINVAL;
LOG_D("%s(va=%p,varea=0x%lx): Invalid address",
__func__, page_va, varea);
}
RD_UNLOCK(aspace);
return rc;
}
rt_varea_t rt_aspace_query(rt_aspace_t aspace, void *vaddr)
{
return _aspace_bst_search(aspace, vaddr);
}
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