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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-05-18 Jesven first version
*/
#include <rthw.h>
#include <rtthread.h>
#ifdef ARCH_MM_MMU
#define DBG_TAG "lwp.arch"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <lwp_arch.h>
#include <lwp_user_mm.h>
extern size_t MMUTable[];
int arch_user_space_init(struct rt_lwp *lwp)
{
size_t *mmu_table;
mmu_table = (size_t *)rt_pages_alloc(0);
if (!mmu_table)
{
return -RT_ENOMEM;
}
lwp->end_heap = USER_HEAP_VADDR;
memset(mmu_table, 0, ARCH_PAGE_SIZE);
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_table, ARCH_PAGE_SIZE);
lwp->aspace = rt_aspace_create(
(void *)USER_VADDR_START, USER_VADDR_TOP - USER_VADDR_START, mmu_table);
if (!lwp->aspace)
{
return -RT_ERROR;
}
return 0;
}
void *arch_kernel_mmu_table_get(void)
{
return (void *)NULL;
}
void arch_user_space_free(struct rt_lwp *lwp)
{
if (lwp)
{
RT_ASSERT(lwp->aspace);
void *pgtbl = lwp->aspace->page_table;
rt_aspace_delete(lwp->aspace);
/* must be freed after aspace delete, pgtbl is required for unmap */
rt_pages_free(pgtbl, 0);
lwp->aspace = NULL;
}
else
{
LOG_W("%s: NULL lwp as parameter", __func__);
RT_ASSERT(0);
}
}
int arch_expand_user_stack(void *addr)
{
int ret = 0;
size_t stack_addr = (size_t)addr;
stack_addr &= ~ARCH_PAGE_MASK;
if ((stack_addr >= (size_t)USER_STACK_VSTART) &&
(stack_addr < (size_t)USER_STACK_VEND))
{
void *map =
lwp_map_user(lwp_self(), (void *)stack_addr, ARCH_PAGE_SIZE, 0);
if (map || lwp_user_accessable(addr, 1))
{
ret = 1;
}
}
return ret;
}
#endif
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