{"id":62029,"date":"2025-04-29T14:45:40","date_gmt":"2025-04-29T06:45:40","guid":{"rendered":"https:\/\/fwq.ai\/blog\/62029\/"},"modified":"2025-04-29T14:45:40","modified_gmt":"2025-04-29T06:45:40","slug":"risc-v-linux%e6%b1%87%e7%bc%96%e5%90%af%e5%8a%a8%e8%bf%87%e7%a8%8b%e5%88%86%e6%9e%90-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/62029\/","title":{"rendered":"RISC-V Linux\u6c47\u7f16\u542f\u52a8\u8fc7\u7a0b\u5206\u6790"},"content":{"rendered":"

RISC-V Linux\u7684\u6c47\u7f16\u542f\u52a8\u90e8\u5206\u6bd4\u8f83\u7b80\u5355\uff0c\u4e0d\u7b97\u590d\u6742\u3002\u6709\u4e24\u4e2a\u90e8\u5206\u6bd4\u8f83\u6838\u5fc3\uff1a\u9875\u8868\u521b\u5efa\u548c\u91cd\u5b9a\u5411\u3002\u9875\u8868\u521b\u5efa\u662f\u7528C\u8bed\u8a00\u5199\u7684\uff0c\u4eca\u5929\u5148\u5206\u6790\u6c47\u7f16\u90e8\u5206\uff0c\u5148\u5e26\u5927\u5bb6\u5206\u6790\u6574\u4f53\u6c47\u7f16\u542f\u52a8\u6d41\u7a0b\uff0c\u7136\u540e\u5206\u6790\u91cd\u5b9a\u5411\u3002<\/p>\n

\n

\u6ce8\u610f\uff1a\u672c\u6587\u57fa\u4e8e5.10.111\u5185\u6838<\/p>\n<\/blockquote>\n

<\/span>\u6c47\u7f16\u542f\u52a8\u6d41\u7a0b<\/span> <\/span> <\/h2>\n

\u5148\u4ece\u6574\u4f53\u5206\u6790\u6c47\u7f16\u505a\u7684\u4e8b\u60c5\uff0c\u6709\u4e2a\u5927\u4f53\u6846\u67b6\u3002<\/p>\n

\u8def\u5f84\uff1aarch\/riscv\/kernel\/head.S\uff0c\u5165\u53e3\u662fENTRY(_start_kernel)<\/p>\n

\"RISC-V <\/p>\n

\u4eceENTRY(_start_kernel)\u5f00\u59cb\u8fdb\u884c\u542f\u52a8\u524d\u7684\u4e00\u4e9b\u521d\u59cb\u5316\uff0c\u5efa\u7acb\u9875\u8868\u524d\u7684\u4e3b\u8981\u5de5\u4f5c\uff1a<\/p>\n

    \n
  • \u5173\u95ed\u6240\u6709\u4e2d\u65ad <\/li>\n<\/ul>\n
    \/* \u5173\u95ed\u6240\u6709\u4e2d\u65ad *\/\n    csrw CSR_IE, zero\n    csrw CSR_IP, zero<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \n
    •  \u52a0\u8f7d\u5168\u5c40\u6307\u9488gp <\/li>\n<\/ul>\n
      \/* \u52a0\u8f7d\u5168\u5c40\u6307\u9488gp *\/\n.option push\n.option norelax\n    la gp, __global_pointer$\n.option pop<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
        \n
      •  disable FPU <\/li>\n<\/ul>\n
        \/* \u7981\u7528 FPU \u4ee5\u68c0\u6d4b\u5185\u6838\u7a7a\u95f4\u4e2d\u6d6e\u70b9\u7684\u975e\u6cd5\u4f7f\u7528*\/\n    li t0, SR_FS\n    csrc CSR_STATUS, t0<\/pre>\n
         \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
          \n
        •  \u9009\u62e9\u4e00\u4e2a\u6838\u542f\u52a8 <\/li>\n<\/ul>\n
          \/* \u9009\u62e9\u4e00\u4e2a\u6838\u542f\u52a8 *\/\n    la a3, hart_lottery\n    li a2, 1\n    amoadd.w a3, a2, (a3)\n    bnez a3, .Lsecondary_start<\/pre>\n
           \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
            \n
          •  \u6e05\u695abss\u6bb5 <\/li>\n<\/ul>\n
            \/* \u6e05\u9664bss *\/\n    la a3, __bss_start\n    la a4, __bss_stop\n    ble a4, a3, clear_bss_done<\/pre>\n
             \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
              \n
            •  \u4fdd\u5b58hart id\u548cdtb\u5730\u5740 <\/li>\n<\/ul>\n
              \/* \u4fdd\u5b58hatr id\u548cdtb\u5730\u5740\uff0chart id\u4fdd\u5b58\u5230a0\uff0cdtb\u5730\u5740\u4fdd\u5b58\u5230a1 *\/\n    mv s0, a0\n    mv s1, a1\n    la a2, boot_cpu_hartid<\/pre>\n
               \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                \n
              •  \u8bbe\u7f6esp\u6307\u9488 <\/li>\n<\/ul>\n
                    la sp, init_thread_union + THREAD_SIZE<\/pre>\n
                 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                  \n
                •  \u4e0a\u8ff0\u5de5\u4f5c\u5b8c\u6210\uff0c\u4f1a\u5f00\u59cb\u4e34\u65f6\u9875\u8868\u7684\u521b\u5efa\uff0c\u8df3\u8f6c\u5230C\u51fd\u6570setup_vm\u5efa\u7acb\u4e34\u65f6\u9875\u8868 <\/li>\n<\/ul>\n
                      mv a0, s1\n    call setup_vm \/\/ \u8df3\u8f6c\u5230C\u51fd\u6570setup_vm\uff0csetup_vm\u4f1a\u521b\u5efa\u4e34\u65f6\u9875\u8868<\/pre>\n
                   \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                    \n
                  •  \u91cd\u5b9a\u5411 <\/li>\n<\/ul>\n
                    #ifdef CONFIG_MMU\n    la a0, early_pg_dir\n    call relocate\t\/\/\u91cd\u5b9a\u5411\uff0c\u5b9e\u9645\u5c31\u662f\u5f00\u542fMMU\n#endif<\/pre>\n
                     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                      \n
                    •  \u8bbe\u7f6e\u5f02\u5e38\u5411\u91cf\u5730\u5740\uff0c\u91cd\u8f7dC\u73af\u5883 <\/li>\n<\/ul>\n
                          call setup_trap_vector\n\/* \u91cd\u8f7dC\u73af\u5883 *\/\n    la tp, init_task\n    sw zero, TASK_TI_CPU(tp)\n    la sp, init_thread_union + THREAD_SIZE<\/pre>\n
                       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                        \n
                      •  \u6700\u540e\u8df3\u8f6c\u5230C\u51fd\u6570start_kernel\uff0c\u5f00\u59cbC\u8bed\u8a00\u90e8\u5206\u521d\u59cb\u5316\uff0c\u6c47\u7f16\u90e8\u5206\u6267\u884c\u5b8c\u6bd5 <\/li>\n<\/ul>\n
                        tail start_kernel<\/pre>\n
                         \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                        \u5b8c\u6574_start_kernel\u6c47\u7f16\u4ee3\u7801\uff1a<\/p>\n
                        ENTRY(_start_kernel)\n\t\/* \u5173\u95ed\u6240\u6709\u4e2d\u65ad *\/\n\tcsrw CSR_IE, zero\n\tcsrw CSR_IP, zero\n\n\t\/* \u5728\u6e90\u7801\u4e2d\uff0c\u8fd9\u91cc\u6709\u4e00\u4e2aM\u6a21\u5f0f\u5904\u7406\u7684\u5b8f\uff0c\u8fd9\u91cc\u6ca1\u6709\u7528\u5230\uff0c\u76f4\u63a5\u8df3\u8fc7*\/\n\n\t\/* \u52a0\u8f7d\u5168\u5c40\u6307\u9488gp *\/\n.option push\n.option norelax\n\tla gp, __global_pointer$\n.option pop\n\n\t\/* \u7981\u7528 FPU \u4ee5\u68c0\u6d4b\u5185\u6838\u7a7a\u95f4\u4e2d\u6d6e\u70b9\u7684\u975e\u6cd5\u4f7f\u7528*\/\n\tli t0, SR_FS\n\tcsrc CSR_STATUS, t0\n\n#ifdef CONFIG_SMP\n\tli t0, CONFIG_NR_CPUS\n\tblt a0, t0, .Lgood_cores\n\ttail .Lsecondary_park\n.Lgood_cores:\n#endif\n\n\t\/* \u9009\u62e9\u4e00\u4e2a\u6838\u542f\u52a8 *\/\n\tla a3, hart_lottery\n\tli a2, 1\n\tamoadd.w a3, a2, (a3)\n\tbnez a3, .Lsecondary_start\n\n\t\/* \u6e05\u9664bss *\/\n\tla a3, __bss_start\n\tla a4, __bss_stop\n\tble a4, a3, clear_bss_done\nclear_bss:\n\tREG_S zero, (a3)\n\tadd a3, a3, RISCV_SZPTR\n\tblt a3, a4, clear_bss\nclear_bss_done:\n\n\t\/* \u4fdd\u5b58hatr id\u548cdtb\u5730\u5740\uff0chart id\u4fdd\u5b58\u5230a0\uff0cdtb\u5730\u5740\u4fdd\u5b58\u5230a1 *\/\n\tmv s0, a0\n\tmv s1, a1\n\tla a2, boot_cpu_hartid\n\tREG_S a0, (a2)\n\n\t\/* \u521d\u59cb\u5316\u9875\u8868\uff0c\u7136\u540e\u91cd\u5b9a\u5411\u5230\u865a\u62df\u5730\u5740 *\/\n\tla sp, init_thread_union + THREAD_SIZE\n\tmv a0, s1\n\tcall setup_vm \/\/ \u8df3\u8f6c\u5230C\u51fd\u6570setup_vm\uff0csetup_vm\u4f1a\u521b\u5efa\u4e34\u65f6\u9875\u8868\n#ifdef CONFIG_MMU\n\tla a0, early_pg_dir\n\tcall relocate\t\/\/\u91cd\u5b9a\u5411\uff0c\u5b9e\u9645\u5c31\u662f\u5f00\u542fMMU\n#endif \/* CONFIG_MMU *\/\n\n\tcall setup_trap_vector\n\t\/* \u91cd\u8f7dC\u73af\u5883 *\/\n\tla tp, init_task\n\tsw zero, TASK_TI_CPU(tp)\n\tla sp, init_thread_union + THREAD_SIZE\n\n#ifdef CONFIG_KASAN\n\tcall kasan_early_init\n#endif\n\t\/* Start the kernel *\/\n\tcall soc_early_init\n\ttail start_kernel\t\/\/\u8df3\u8f6c\u5230C\u51fd\u6570start_kernel\uff0c\u5f00\u59cbC\u8bed\u8a00\u90e8\u5206\u521d\u59cb\u5316<\/pre>\n
                         \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                        \u6c47\u7f16\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u4e00\u4e2a\u90e8\u5206\u5c31\u662f\u9875\u8868\u7684\u521b\u5efa\uff0c\u5173\u4e4e\u7740\u540e\u9762\u7684\u7a0b\u5e8f\u80fd\u4e0d\u80fd\u7ee7\u7eed\u5f80\u4e0b\u8dd1\u3002setup_vm\u521b\u5efa\u9875\u8868\u540e\u5c31\u4f1a\u5f00\u59cb\u6267\u884crelocate\u91cd\u5b9a\u5411\uff0c\u8fd9\u4e2a\u91cd\u5b9a\u5411\u4e3b\u8981\u5f00\u542fmmu\uff0c\u4e0b\u9762\u5206\u6790relocate\u7684\u6c47\u7f16\u3002<\/p>\n
                         <\/span>relocate<\/span> <\/span> <\/h2>\n
                        relocate\u91cd\u5b9a\u5411\uff0c\u5c31\u662f\u5728\u5f00\u542fmmu\u3002\u5f00\u542fmmu\u7684\u64cd\u4f5c\u5c31\u662f\u5c06\u4e00\u7ea7\u9875\u8868\u7684\u5730\u5740\u4ee5\u53ca\u6743\u9650\u5199\u5230satp\u5bc4\u5b58\u5668\u4e2d\uff0c\u8fd9\u5c31\u7b97\u5f00\u542fmmu\u4e86\u3002<\/p>\n
                        #ifdef CONFIG_MMU\n    la a0, early_pg_dir \/\/\u8df3\u8f6c\u5230relocate\u524d\uff0c\u5148\u628a\u7b2c\u4e00\u7ea7\u9875\u8868early_pg_dir\u7684\u5730\u5740\u5b58\u5165a0\n    call relocate\t\t\/\/\u8df3\u8f6c\u5230relocate,\u5f00\u542fMMU\n#endif<\/pre>\n
                         \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                        relocate\u6709\u4e24\u6b21\u5f00\u542fmmu\u7684\u64cd\u4f5c\uff0c\u7b2c\u4e00\u6b21\u5f00\u542fmmu\u4f7f\u7528\u7684\u662fsetup_vm()\u5efa\u7acb\u7684trampoline_gd_dir\u9875\u8868\uff0c\u8fd9\u9875\u8868\u4fdd\u5b58\u7684\u662fkernel\u7684\u524d2M\u5185\u5b58\u3002\u7b2c\u4e8c\u6b21\u5f00\u542fMMU\u4f7f\u7528\u7684\u662fearly_pg_dir\u9875\u8868\uff0c\u8fd9\u4e2a\u9875\u8868\u6620\u5c04\u4e86\u6574\u4e2akernel\u5185\u5b58\u4ee5\u53cadtb\u76844M\u7a7a\u95f4\u3002<\/p>\n
                        \u5982\u679ctrampoline_pg_dir\u6216\u8005early_pg_dir\u8fd9\u4e24\u4e2a\u9875\u8868\u7684\u6620\u5c04\u6ca1\u5f04\u597d\u7684\u8bdd\uff0c\u5f00\u542fMMU\u7684\u65f6\u5019\u5c31\u4f1a\u5931\u8d25\uff0c\u6240\u4ee5\u9875\u8868\u7684\u5efa\u7acb\u5341\u5206\u5173\u952e\u3002\u9875\u8868\u521b\u5efa\u540e\u7eed\u518d\u6df1\u7a76\uff0c\u4e0b\u9762\u5206\u6790relocate\u6c47\u7f16\u4ee3\u7801\u3002<\/p>\n
                          \n
                        • \n
                          \u8ba1\u7b97\u8fd4\u56de\u5730\u5740<\/p>\n
                          \u8fd4\u56de\u5730\u5740\u5c31\u662fra\u52a0\u4e0a\u865a\u62df\u5730\u5740\u548c\u7269\u7406\u5730\u5740\u4e4b\u95f4\u7684\u504f\u79fb\u91cf\uff0c\u8fd9\u4e2a\u662f\u56fa\u5b9a\u504f\u79fb\u91cf\u3002PAGE_OFFSET\u662fkernel\u5165\u53e3\u5730\u5740\u5bf9\u5e94\u7684\u865a\u62df\u5730\u5740\uff0c_start\u5c31\u662fkernel\u5165\u53e3\u5730\u5740\u7684\u865a\u62df\u5730\u5740\uff0cPAGE_OFFSET – _start\u5c31\u5f97\u5230\u5b83\u4eec\u4e4b\u95f4\u7684\u504f\u79fb\uff0c\u7136\u540e\u518d\u548cra\u76f8\u52a0\uff0c\u5c31\u662f\u8fd4\u56de\u5730\u5740\u3002<\/p>\n<\/li>\n<\/ul>\n
                          \/* Relocate return address *\/\n\tli a1, PAGE_OFFSET\n\tla a2, _start\n\tsub a1, a1, a2\n\tadd ra, ra, a1<\/pre>\n
                           \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                            \n
                          • \n
                            \u5c06\u5f02\u5e38\u5165\u53e31f\u7684\u865a\u62df\u5730\u5740\u5199\u5165stvec\u5bc4\u5b58\u5668<\/p>\n
                            \u56e0\u4e3a\u4e00\u65e6\u5f00\u542fMMU\uff0c\u5730\u5740\u90fd\u53d8\u6210\u4e86\u865a\u62df\u5730\u5740\uff0c\u539f\u6765\u8bbf\u95ee\u7684\u90fd\u662f\u7269\u7406\u5730\u5740\uff0c\u5f00\u542fMMU\u65f6\uff0c\u5730\u5740\u53d1\u751f\u4e86\u6539\u53d8\uff0cVA != PA\uff0c\u4ece\u800c\u8fdb\u5165\u5f02\u5e38\uff0c\u6240\u4ee5\u8981\u5148\u8bbe\u7f6e\u5f02\u5e38\u5165\u53e3\u5730\u5740\uff0c\u6b64\u65f6\u7684\u5f02\u5e38\u5165\u53e3\u4e3a1f\u3002<\/p>\n<\/li>\n<\/ul>\n
                            \/* Point stvec to virtual address of intruction after satp write *\/\n\tla a2, 1f\n\tadd a2, a2, a1\n\tcsrw CSR_TVEC, a2<\/pre>\n
                             \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                              \n
                            •  \u63d0\u524d\u8ba1\u7b97\u5207\u6362\u5230early_pg_dir\u9875\u8868\u8981\u5199\u5165satp\u7684\u503c <\/li>\n<\/ul>\n
                               \u518d\u8fdb\u5165relocate\u4e4b\u524d\uff0c\u5c31\u5df2\u7ecf\u628aearly_pg_dir\u8d4b\u503c\u7ed9a0\u4e86\uff0c\u6240\u4ee5a0\u662fearly_pg_dir\u3002srl\u662f\u903b\u8f91\u53f3\u79fb\uff0cmmu\u4f7f\u7528\u7684\u662fsv39\uff0c\u865a\u62df\u5730\u574039\u4f4d\uff0c\u7269\u7406\u5730\u574056\u4f4d\uff1a<\/p>\n
                              \"RISC-V\u4f4e12\u4f4d\u662f\u504f\u79fb\u91cf\uff0c\u6240\u4ee5PAGE_SHIFT\u7b49\u4e8e12\uff0c\u5c06early_pg_dir\u5730\u5740\u53f3\u79fb12\u4f4d\u5b58\u5230a2\u3002\u6839\u636esatp\u5bc4\u5b58\u5668\u5b9a\u4e49\uff1a<\/p>\n
                              \"RISC-V <\/p>\n
                              MODE\u7b49\u4e8e0x8\u4ee3\u8868\u4f7f\u7528sv39 mmu\uff0c0x0\u4ee3\u8868\u4e0d\u8fdb\u884c\u5730\u5740\u7ffb\u8bd1\uff0c\u5373\u4e0d\u5f00\u542fMMU\u3002\u8fd9\u91ccSTAP_MODE\u4e3asv39\uff0c\u53730x8\u3002\u5c06early_pg_dir\u5730\u5740\u548cSATP_MODE\u8fdb\u884c\u6216\u8fd0\u7b97\u540e\uff0c\u5373\u53ef\u5f97\u5230\u5199\u5165satp\u5bc4\u5b58\u5668\u7684\u503c\uff0c\u6700\u540e\u4fdd\u5b58\u5230a2\u3002<\/p>\n
                              \/* Compute satp for kernel page tables, but don't load it yet *\/\n\tsrl a2, a0, PAGE_SHIFT\n\tli a1, SATP_MODE\t\/\/sv39 mmu\n\tor a2, a2, a1<\/pre>\n
                               \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                                \n
                              •  \u7b2c\u4e00\u6b21\u5f00\u542fMMU\uff0c\u4f7f\u7528trampoline_pg_dir\u9875\u8868 <\/li>\n<\/ul>\n
                                satp\u503c\u7684\u8ba1\u7b97\u548c\u4e0a\u8ff0\u662f\u4e00\u6837\u7684\u3002\u5f00\u542fMMU\u4e4b\u524d\uff0c\u901a\u8fc7sfence.vma\u547d\u4ee4\u5148\u5237\u65b0TLB\u3002\u6b64\u65f6\u5f00\u542fMMU\uff0c\u5c31\u4f1a\u8fdb\u5165\u4e0b\u9762\u7684\u6807\u53f7\u4e3a1\u7684\u6c47\u7f16\u6bb5<\/p>\n
                                \tla a0, trampoline_pg_dir\n\tsrl a0, a0, PAGE_SHIFT\n\tor a0, a0, a1\n\tsfence.vma\t\n\tcsrw CSR_SATP, a0<\/pre>\n
                                 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                                \u8fdb\u5165\u5f02\u5e381f\u6bb5\uff0c\u91cd\u65b0\u8bbe\u7f6e\u5f02\u5e38\u5165\u53e3\u4e3a.Lsecondary_park\uff0c\u7136\u540e\u5207\u6362\u5230early_pg_dir\u9875\u8868\uff0c\u76f8\u5f53\u4e8e\u7b2c\u4e8c\u6b21\u5f00\u542fMMU\u3002\u6b64\u65f6\uff0c\u5982\u679c\u4e4b\u524d\u5efa\u7acb\u7684early_pg_dir\u9875\u8868\u4e0d\u5bf9\uff0c\u5219\u4f1a\u5c31\u8fdb\u5165.Lsecondary_park\u3002.Lsecondary_park\u91cc\u9762\u662f\u4e2awfi\u6307\u4ee4\uff0c\u662f\u4e2a\u6b7b\u5faa\u73af\u3002<\/p>\n
                                \u5b8c\u6574relocate\u6c47\u7f16\u4ee3\u7801\uff1a<\/p>\n
                                relocate:\n\t\/* Relocate return address *\/\n\tli a1, PAGE_OFFSET\n\tla a2, _start\n\tsub a1, a1, a2\n\tadd ra, ra, a1\n\n\t\/* Point stvec to virtual address of intruction after satp write *\/\n\tla a2, 1f\n\tadd a2, a2, a1\n\tcsrw CSR_TVEC, a2\n\n\t\/* Compute satp for kernel page tables, but don't load it yet *\/\n\tsrl a2, a0, PAGE_SHIFT\n\tli a1, SATP_MODE\n\tor a2, a2, a1\n\n\t\/*\n\t * Load trampoline page directory, which will cause us to trap to\n\t * stvec if VA != PA, or simply fall through if VA == PA.  We need a\n\t * full fence here because setup_vm() just wrote these PTEs and we need\n\t * to ensure the new translations are in use.\n\t *\/\n\tla a0, trampoline_pg_dir\n\tsrl a0, a0, PAGE_SHIFT\n\tor a0, a0, a1\n\tsfence.vma\n\tcsrw CSR_SATP, a0\n.align 2\n1:\n\t\/* Set trap vector to spin forever to help debug *\/\n\tla a0, .Lsecondary_park\n\tcsrw CSR_TVEC, a0\n\n\t\/* Reload the global pointer *\/\n.option push\n.option norelax\n\tla gp, __global_pointer$\n.option pop\n\n\t\/*\n\t * Switch to kernel page tables.  A full fence is necessary in order to\n\t * avoid using the trampoline translations, which are only correct for\n\t * the first superpage.  Fetching the fence is guarnteed to work\n\t * because that first superpage is translated the same way.\n\t *\/\n\tcsrw CSR_SATP, a2\n\tsfence.vma\n\n\tret<\/pre>\n
                                 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
                                 <\/span>\u603b\u7ed3<\/span> <\/span> <\/h2>\n
                                \u4ee5\u4e0a\u5c31\u662fRISC-V Linux\u7684\u6c47\u7f16\u542f\u52a8\u6d41\u7a0b\uff0c\u867d\u8bf4RISC-V\u7684\u6307\u4ee4\u4e0d\u590d\u6742\uff0c\u4f46\u8981\u7406\u89e3\u8fd9\u4e2a\u6c47\u7f16\u542f\u52a8\u7684\u90e8\u5206\uff0c\u8fd8\u662f\u9700\u8981\u4e00\u70b9\u57fa\u7840\u548c\u65f6\u95f4\u3002\u53e6\u5916\uff0c\u5927\u591a\u6570\u4eba\u5de5\u4f5c\u4e2d\u57fa\u672c\u7528\u4e0d\u4e0a\u6c47\u7f16\uff0c\u53ea\u6709\u771f\u6b63\u7528\u4e0a\u4e86\u7406\u89e3\u624d\u4f1a\u6bd4\u8f83\u6df1\u3002\u5e0c\u671b\u672c\u6587\u80fd\u591f\u5e2e\u52a9\u5230\u6709\u9700\u8981\u7684\u4eba\u3002<\/p>\n<\/p>\n
                                \u4ee5\u4e0a\u5c31\u662fRISC-V Linux\u6c47\u7f16\u542f\u52a8\u8fc7\u7a0b\u5206\u6790\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8FDCServers\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
                                RISC-V Linux\u7684\u6c47\u7f16\u542f\u52a8\u90e8\u5206\u6bd4\u8f83\u7b80\u5355\uff0c\u4e0d\u7b97\u590d\u6742\u3002\u6709\u4e24\u4e2a\u90e8\u5206\u6bd4\u8f83\u6838\u5fc3\uff1a\u9875\u8868\u521b\u5efa\u548c\u91cd\u5b9a\u5411\u3002\u9875\u8868\u521b\u5efa\u662f\u7528C\u8bed\u8a00\u5199\u7684\uff0c\u4eca\u5929\u5148\u5206\u6790\u6c47\u7f16\u90e8\u5206\uff0c\u5148\u5e26\u5927\u5bb6\u5206\u6790\u6574\u4f53\u6c47\u7f16\u542f\u52a8\u6d41\u7a0b\uff0c\u7136\u540e\u5206\u6790\u91cd\u5b9a\u5411\u3002 \u6ce8\u610f\uff1a\u672c\u6587\u57fa\u4e8e5.10.111\u5185\u6838 \u6c47\u7f16\u542f\u52a8\u6d41\u7a0b \u5148\u4ece\u6574\u4f53\u5206\u6790\u6c47\u7f16\u505a\u7684\u4e8b\u60c5\uff0c\u6709\u4e2a\u5927\u4f53\u6846\u67b6\u3002 \u8def\u5f84\uff1aarch\/riscv\/kernel\/head.S\uff0c\u5165\u53e3\u662fENTRY(_start_kernel) \u4eceENTRY(_start_kernel)\u5f00\u59cb\u8fdb\u884c\u542f\u52a8\u524d\u7684\u4e00\u4e9b\u521d\u59cb\u5316\uff0c\u5efa\u7acb\u9875\u8868\u524d\u7684\u4e3b\u8981\u5de5\u4f5c\uff1a \u5173\u95ed\u6240\u6709\u4e2d\u65ad \/* \u5173\u95ed\u6240\u6709\u4e2d\u65ad *\/     csrw CSR_IE, zero     csrw CSR_IP, zero \u767b\u5f55\u540e\u590d\u5236 \u52a0\u8f7d\u5168\u5c40\u6307\u9488gp \/* \u52a0\u8f7d\u5168\u5c40\u6307\u9488gp *\/ .option push .option norelax     la gp, __global_pointer$ .option pop \u767b\u5f55\u540e\u590d\u5236 disable FPU \/* \u7981\u7528 FPU \u4ee5\u68c0\u6d4b\u5185\u6838\u7a7a\u95f4\u4e2d\u6d6e\u70b9\u7684\u975e\u6cd5\u4f7f\u7528*\/     li t0, SR_FS     csrc CSR_STATUS, t0 \u767b\u5f55\u540e\u590d\u5236 \u9009\u62e9\u4e00\u4e2a\u6838\u542f\u52a8 \/* \u9009\u62e9\u4e00\u4e2a\u6838\u542f\u52a8 *\/     la a3, hart_lottery     li a2, 1     amoadd.w a3, a2, (a3)     bnez a3, .Lsecondary_start \u767b\u5f55\u540e\u590d\u5236 \u6e05\u695abss\u6bb5 \/* \u6e05\u9664bss *\/     la a3, __bss_start     la a4, __bss_stop     ble a4, a3, clear_bss_done \u767b\u5f55\u540e\u590d\u5236 \u4fdd\u5b58hart id\u548cdtb\u5730\u5740 \/* \u4fdd\u5b58hatr id\u548cdtb\u5730\u5740\uff0chart id\u4fdd\u5b58\u5230a0\uff0cdtb\u5730\u5740\u4fdd\u5b58\u5230a1 *\/     mv s0, a0     mv s1, a1     la a2, boot_cpu_hartid \u767b\u5f55\u540e\u590d\u5236 \u8bbe\u7f6esp\u6307\u9488     la sp, init_thread_union + THREAD_SIZE \u767b\u5f55\u540e\u590d\u5236 \u4e0a\u8ff0\u5de5\u4f5c\u5b8c\u6210\uff0c\u4f1a\u5f00\u59cb\u4e34\u65f6\u9875\u8868\u7684\u521b\u5efa\uff0c\u8df3\u8f6c\u5230C\u51fd\u6570setup_vm\u5efa\u7acb\u4e34\u65f6\u9875\u8868     mv a0, s1     call setup_vm \/\/ \u8df3\u8f6c\u5230C\u51fd\u6570setup_vm\uff0csetup_vm\u4f1a\u521b\u5efa\u4e34\u65f6\u9875\u8868 \u767b\u5f55\u540e\u590d\u5236 \u91cd\u5b9a\u5411 #ifdef CONFIG_MMU     la a0, early_pg_dir […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-62029","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/62029","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=62029"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/62029\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=62029"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=62029"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=62029"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}