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107 lines
2.3 KiB
107 lines
2.3 KiB
5 months ago
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/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2022-11-14 WangXiaoyao the first version
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*/
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#include <rtthread.h>
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#define DBG_TAG "mm.kmem"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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#include "mm_aspace.h"
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#include "mm_private.h"
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#include <mmu.h>
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static void list_kmem(void)
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{
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rt_aspace_print_all(&rt_kernel_space);
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}
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MSH_CMD_EXPORT(list_kmem, List varea in kernel virtual memory space);
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void rt_kmem_list(void) __attribute__((alias("list_kmem")));
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static rt_ubase_t rt_pv_offset;
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const rt_ubase_t rt_kmem_pvoff(void)
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{
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return rt_pv_offset;
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}
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void rt_kmem_pvoff_set(rt_ubase_t pvoff)
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{
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rt_pv_offset = pvoff;
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}
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#define _KMEM_LO_OFF(addr) ((rt_ubase_t)(addr) & ARCH_PAGE_MASK)
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int rt_kmem_map_phy(void *va, void *pa, rt_size_t length, rt_size_t attr)
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{
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int err;
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size_t lo_off;
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lo_off = _KMEM_LO_OFF(pa);
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if (va == RT_NULL)
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{
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LOG_E("%s: va NULL is not a valid input", __func__);
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err = -RT_EINVAL;
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}
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else if (_KMEM_LO_OFF(pa) != _KMEM_LO_OFF(va))
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{
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LOG_E("%s: misaligned PA(%p) to VA(%p)", __func__, pa, va);
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err = -RT_EINVAL;
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}
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else
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{
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struct rt_mm_va_hint hint = {.flags = MMF_MAP_FIXED,
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.limit_range_size = rt_kernel_space.size,
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.limit_start = rt_kernel_space.start,
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.prefer = va,
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.map_size = RT_ALIGN(length + lo_off, ARCH_PAGE_SIZE)};
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err = rt_aspace_map_phy(&rt_kernel_space, &hint, attr, MM_PA_TO_OFF(pa), &va);
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if (err)
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{
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LOG_W("%s: map %p to %p (%p bytes) failed(err %d)", __func__, pa, va, length, err);
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}
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}
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return err;
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}
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void *rt_kmem_v2p(void *vaddr)
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{
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return rt_hw_mmu_v2p(&rt_kernel_space, vaddr);
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}
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void *rt_kmem_p2v(void *paddr)
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{
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char *rc;
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char *linear_va;
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char *linear_pa;
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if (paddr != ARCH_MAP_FAILED)
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{
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linear_va = (char *)paddr - PV_OFFSET;
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linear_pa = rt_kmem_v2p(linear_va);
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if (linear_pa != paddr)
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{
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rc = RT_NULL;
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}
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else
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{
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rc = linear_va;
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}
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}
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else
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{
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rc = RT_NULL;
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}
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return rc;
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}
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