void boot_linux(int , int , unsigned int) { /* 1、获取linux启动地址 */ thekernel = (void (*)(int , int , unsigned int))SDRAM_KERNEL_START; //将内核的启动地址声明为函数指针 /* 2、设置启动参数 主要的启动参数*/ /* 核心启动参数、 */ steup_core_tag(); /* 内存参数、 */ steup_mem_tag(); /* 命令行参数、 */ steup_cline_tag(); /* 参数结束) */ steup_end_tag(); /* 3、启动linux系统 */ thekernel(0,1999,SDRAM_TAGS_START); }
int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images) { /* First parameter is mapped to $r5 for kernel boot args */ void (*thekernel) (char *, ulong, ulong); char *commandline = getenv("bootargs"); ulong rd_data_start, rd_data_end; if ((flag != 0) && (flag != BOOTM_STATE_OS_GO)) return 1; int ret; char *of_flat_tree = NULL; #if defined(CONFIG_OF_LIBFDT) /* did generic code already find a device tree? */ if (images->ft_len) of_flat_tree = images->ft_addr; #endif thekernel = (void (*)(char *, ulong, ulong))images->ep; /* find ramdisk */ ret = boot_get_ramdisk(argc, argv, images, IH_ARCH_MICROBLAZE, &rd_data_start, &rd_data_end); if (ret) return 1; bootstage_mark(BOOTSTAGE_ID_RUN_OS); if (!of_flat_tree && argc > 1) of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16); /* fixup the initrd now that we know where it should be */ if (images->rd_start && images->rd_end && of_flat_tree) ret = fdt_initrd(of_flat_tree, images->rd_start, images->rd_end, 1); if (ret) return 1; #ifdef DEBUG printf("## Transferring control to Linux (at address 0x%08lx) ", (ulong)thekernel); printf("ramdisk 0x%08lx, FDT 0x%08lx...\n", rd_data_start, (ulong) of_flat_tree); #endif #ifdef XILINX_USE_DCACHE flush_cache(0, XILINX_DCACHE_BYTE_SIZE); #endif /* * Linux Kernel Parameters (passing device tree): * r5: pointer to command line * r6: pointer to ramdisk * r7: pointer to the fdt, followed by the board info data */ thekernel(commandline, rd_data_start, (ulong)of_flat_tree); /* does not return */ return 1; }