1 /* 2 * (C) Copyright 2003, Psyent Corporation <www.psyent.com> 3 * Scott McNutt <smcnutt@psyent.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <command.h> 10 #include <asm/byteorder.h> 11 #include <asm/cache.h> 12 13 #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */ 14 15 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images) 16 { 17 void (*kernel)(int, int, int, char *) = (void *)images->ep; 18 char *commandline = getenv("bootargs"); 19 ulong initrd_start = images->rd_start; 20 ulong initrd_end = images->rd_end; 21 char *of_flat_tree = NULL; 22 #if defined(CONFIG_OF_LIBFDT) 23 /* did generic code already find a device tree? */ 24 if (images->ft_len) 25 of_flat_tree = images->ft_addr; 26 #endif 27 if (!of_flat_tree && argc > 1) 28 of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16); 29 if (of_flat_tree) 30 initrd_end = (ulong)of_flat_tree; 31 32 /* 33 * allow the PREP bootm subcommand, it is required for bootm to work 34 */ 35 if (flag & BOOTM_STATE_OS_PREP) 36 return 0; 37 38 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO)) 39 return 1; 40 41 /* flushes data and instruction caches before calling the kernel */ 42 disable_interrupts(); 43 flush_dcache((ulong)kernel, CONFIG_SYS_DCACHE_SIZE); 44 flush_icache((ulong)kernel, CONFIG_SYS_ICACHE_SIZE); 45 46 debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline); 47 debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end); 48 /* kernel parameters passing 49 * r4 : NIOS magic 50 * r5 : initrd start 51 * r6 : initrd end or fdt 52 * r7 : kernel command line 53 * fdt is passed to kernel via r6, the same as initrd_end. fdt will be 54 * verified with fdt magic. when both initrd and fdt are used at the 55 * same time, fdt must follow immediately after initrd. 56 */ 57 kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline); 58 /* does not return */ 59 60 return 1; 61 } 62