39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
/*
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* Copyright (c) 2020 Institute of Parallel And Distributed Systems (IPADS), Shanghai Jiao Tong University (SJTU)
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* OS-Lab-2020 (i.e., ChCore) is licensed under the Mulan PSL v1.
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* You can use this software according to the terms and conditions of the Mulan PSL v1.
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* You may obtain a copy of Mulan PSL v1 at:
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* http://license.coscl.org.cn/MulanPSL
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR
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* PURPOSE.
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* See the Mulan PSL v1 for more details.
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*/
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#include <common/util.h>
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#include <common/vars.h>
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#include <common/types.h>
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#include <common/kprint.h>
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#include <common/macro.h>
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/*
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* Currently, we enable EL1 (kernel) to directly access EL0 (user) memory.
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* But, El1 cannot execute EL0 code.
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*/
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int copy_from_user(char *kernel_buf, char *user_buf, size_t size)
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{
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/* validate user_buf */
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BUG_ON((u64) user_buf >= KBASE);
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memcpy(kernel_buf, user_buf, size);
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return 0;
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}
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int copy_to_user(char *user_buf, char *kernel_buf, size_t size)
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{
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/* validate user_buf */
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BUG_ON((u64) user_buf >= KBASE);
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memcpy(user_buf, kernel_buf, size);
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return 0;
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}
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