xinyangli
2824efad33
NJU-ProjectN/nemu eb63cf3568dbf4e0c3c6ef462e6ec685550fabbc Merge pull request #76 from rijuyuezhu/master
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/***************************************************************************************
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* Copyright (c) 2014-2022 Zihao Yu, Nanjing University
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*
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* NEMU is licensed under Mulan PSL v2.
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* You can use this software according to the terms and conditions of the Mulan PSL v2.
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* You may obtain a copy of Mulan PSL v2 at:
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* http://license.coscl.org.cn/MulanPSL2
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*
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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*
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* See the Mulan PSL v2 for more details.
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***************************************************************************************/
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#include <memory/host.h>
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#include <memory/paddr.h>
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#include <device/mmio.h>
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#include <isa.h>
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#if defined(CONFIG_PMEM_MALLOC)
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static uint8_t *pmem = NULL;
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#else // CONFIG_PMEM_GARRAY
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static uint8_t pmem[CONFIG_MSIZE] PG_ALIGN = {};
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#endif
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uint8_t* guest_to_host(paddr_t paddr) { return pmem + paddr - CONFIG_MBASE; }
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paddr_t host_to_guest(uint8_t *haddr) { return haddr - pmem + CONFIG_MBASE; }
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static word_t pmem_read(paddr_t addr, int len) {
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word_t ret = host_read(guest_to_host(addr), len);
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return ret;
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}
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static void pmem_write(paddr_t addr, int len, word_t data) {
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host_write(guest_to_host(addr), len, data);
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}
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static void out_of_bound(paddr_t addr) {
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panic("address = " FMT_PADDR " is out of bound of pmem [" FMT_PADDR ", " FMT_PADDR "] at pc = " FMT_WORD,
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addr, PMEM_LEFT, PMEM_RIGHT, cpu.pc);
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}
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void init_mem() {
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#if defined(CONFIG_PMEM_MALLOC)
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pmem = malloc(CONFIG_MSIZE);
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assert(pmem);
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#endif
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IFDEF(CONFIG_MEM_RANDOM, memset(pmem, rand(), CONFIG_MSIZE));
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Log("physical memory area [" FMT_PADDR ", " FMT_PADDR "]", PMEM_LEFT, PMEM_RIGHT);
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}
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word_t paddr_read(paddr_t addr, int len) {
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if (likely(in_pmem(addr))) return pmem_read(addr, len);
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IFDEF(CONFIG_DEVICE, return mmio_read(addr, len));
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out_of_bound(addr);
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return 0;
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}
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void paddr_write(paddr_t addr, int len, word_t data) {
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if (likely(in_pmem(addr))) { pmem_write(addr, len, data); return; }
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IFDEF(CONFIG_DEVICE, mmio_write(addr, len, data); return);
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out_of_bound(addr);
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}
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