1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2003 4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 5 */ 6 7 #include <common.h> 8 #include <command.h> 9 #include <image.h> 10 #include <u-boot/zlib.h> 11 #include <bzlib.h> 12 #include <watchdog.h> 13 #include <environment.h> 14 #include <asm/byteorder.h> 15 #ifdef CONFIG_SHOW_BOOT_PROGRESS 16 # include <status_led.h> 17 #endif 18 19 DECLARE_GLOBAL_DATA_PTR; 20 21 #define PHYSADDR(x) x 22 23 #define LINUX_MAX_ENVS 256 24 #define LINUX_MAX_ARGS 256 25 26 static ulong get_sp (void); 27 static void set_clocks_in_mhz (bd_t *kbd); 28 29 void arch_lmb_reserve(struct lmb *lmb) 30 { 31 ulong sp; 32 33 /* 34 * Booting a (Linux) kernel image 35 * 36 * Allocate space for command line and board info - the 37 * address should be as high as possible within the reach of 38 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused 39 * memory, which means far enough below the current stack 40 * pointer. 41 */ 42 sp = get_sp(); 43 debug ("## Current stack ends at 0x%08lx ", sp); 44 45 /* adjust sp by 1K to be safe */ 46 sp -= 1024; 47 lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp)); 48 } 49 50 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images) 51 { 52 int ret; 53 bd_t *kbd; 54 void (*kernel) (bd_t *, ulong, ulong, ulong, ulong); 55 struct lmb *lmb = &images->lmb; 56 57 /* 58 * allow the PREP bootm subcommand, it is required for bootm to work 59 */ 60 if (flag & BOOTM_STATE_OS_PREP) 61 return 0; 62 63 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO)) 64 return 1; 65 66 /* allocate space for kernel copy of board info */ 67 ret = boot_get_kbd (lmb, &kbd); 68 if (ret) { 69 puts("ERROR with allocation of kernel bd\n"); 70 goto error; 71 } 72 set_clocks_in_mhz(kbd); 73 74 ret = image_setup_linux(images); 75 if (ret) 76 goto error; 77 78 kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep; 79 80 debug("## Transferring control to Linux (at address %08lx) ...\n", 81 (ulong) kernel); 82 83 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 84 85 /* 86 * Linux Kernel Parameters (passing board info data): 87 * sp+00: Ignore, side effect of using jsr to jump to kernel 88 * sp+04: ptr to board info data 89 * sp+08: initrd_start or 0 if no initrd 90 * sp+12: initrd_end - unused if initrd_start is 0 91 * sp+16: Start of command line string 92 * sp+20: End of command line string 93 */ 94 (*kernel)(kbd, images->initrd_start, images->initrd_end, 95 images->cmdline_start, images->cmdline_end); 96 /* does not return */ 97 error: 98 return 1; 99 } 100 101 static ulong get_sp (void) 102 { 103 ulong sp; 104 105 asm("movel %%a7, %%d0\n" 106 "movel %%d0, %0\n": "=d"(sp): :"%d0"); 107 108 return sp; 109 } 110 111 static void set_clocks_in_mhz (bd_t *kbd) 112 { 113 char *s; 114 115 s = env_get("clocks_in_mhz"); 116 if (s) { 117 /* convert all clock information to MHz */ 118 kbd->bi_intfreq /= 1000000L; 119 kbd->bi_busfreq /= 1000000L; 120 } 121 } 122