1 /* 2 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 9 DECLARE_GLOBAL_DATA_PTR; 10 11 static ulong get_sp(void) 12 { 13 ulong ret; 14 15 asm("mov %0, sp" : "=r"(ret) : ); 16 return ret; 17 } 18 19 void arch_lmb_reserve(struct lmb *lmb) 20 { 21 ulong sp; 22 23 /* 24 * Booting a (Linux) kernel image 25 * 26 * Allocate space for command line and board info - the 27 * address should be as high as possible within the reach of 28 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused 29 * memory, which means far enough below the current stack 30 * pointer. 31 */ 32 sp = get_sp(); 33 debug("## Current stack ends at 0x%08lx ", sp); 34 35 /* adjust sp by 4K to be safe */ 36 sp -= 4096; 37 lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp)); 38 } 39 40 static int cleanup_before_linux(void) 41 { 42 disable_interrupts(); 43 flush_dcache_all(); 44 invalidate_icache_all(); 45 46 return 0; 47 } 48 49 /* Subcommand: PREP */ 50 static void boot_prep_linux(bootm_headers_t *images) 51 { 52 if (image_setup_linux(images)) 53 hang(); 54 } 55 56 /* Subcommand: GO */ 57 static void boot_jump_linux(bootm_headers_t *images, int flag) 58 { 59 void (*kernel_entry)(int zero, int arch, uint params); 60 unsigned int r0, r2; 61 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 62 63 kernel_entry = (void (*)(int, int, uint))images->ep; 64 65 debug("## Transferring control to Linux (at address %08lx)...\n", 66 (ulong) kernel_entry); 67 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 68 69 printf("\nStarting kernel ...%s\n\n", fake ? 70 "(fake run for tracing)" : ""); 71 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); 72 73 cleanup_before_linux(); 74 75 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { 76 r0 = 2; 77 r2 = (unsigned int)images->ft_addr; 78 } else { 79 r0 = 1; 80 r2 = (unsigned int)getenv("bootargs"); 81 } 82 83 if (!fake) 84 kernel_entry(r0, 0, r2); 85 } 86 87 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) 88 { 89 /* No need for those on ARC */ 90 if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE)) 91 return -1; 92 93 if (flag & BOOTM_STATE_OS_PREP) { 94 boot_prep_linux(images); 95 return 0; 96 } 97 98 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { 99 boot_jump_linux(images, flag); 100 return 0; 101 } 102 103 boot_prep_linux(images); 104 boot_jump_linux(images, flag); 105 return 0; 106 } 107