| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | } |