1 /* 2 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <asm/cache.h> 8 #include <common.h> 9 10 DECLARE_GLOBAL_DATA_PTR; 11 12 static ulong get_sp(void) 13 { 14 ulong ret; 15 16 asm("mov %0, sp" : "=r"(ret) : ); 17 return ret; 18 } 19 20 void arch_lmb_reserve(struct lmb *lmb) 21 { 22 ulong sp; 23 24 /* 25 * Booting a (Linux) kernel image 26 * 27 * Allocate space for command line and board info - the 28 * address should be as high as possible within the reach of 29 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused 30 * memory, which means far enough below the current stack 31 * pointer. 32 */ 33 sp = get_sp(); 34 debug("## Current stack ends at 0x%08lx ", sp); 35 36 /* adjust sp by 4K to be safe */ 37 sp -= 4096; 38 lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp)); 39 } 40 41 static int cleanup_before_linux(void) 42 { 43 disable_interrupts(); 44 sync_n_cleanup_cache_all(); 45 46 return 0; 47 } 48 49 __weak int board_prep_linux(bootm_headers_t *images) { return 0; } 50 51 /* Subcommand: PREP */ 52 static int boot_prep_linux(bootm_headers_t *images) 53 { 54 int ret; 55 56 ret = image_setup_linux(images); 57 if (ret) 58 return ret; 59 60 return board_prep_linux(images); 61 } 62 63 /* Generic implementation for single core CPU */ 64 __weak void board_jump_and_run(ulong entry, int zero, int arch, uint params) 65 { 66 void (*kernel_entry)(int zero, int arch, uint params); 67 68 kernel_entry = (void (*)(int, int, uint))entry; 69 70 kernel_entry(zero, arch, params); 71 } 72 73 /* Subcommand: GO */ 74 static void boot_jump_linux(bootm_headers_t *images, int flag) 75 { 76 ulong kernel_entry; 77 unsigned int r0, r2; 78 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 79 80 kernel_entry = images->ep; 81 82 debug("## Transferring control to Linux (at address %08lx)...\n", 83 kernel_entry); 84 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 85 86 printf("\nStarting kernel ...%s\n\n", fake ? 87 "(fake run for tracing)" : ""); 88 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); 89 90 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { 91 r0 = 2; 92 r2 = (unsigned int)images->ft_addr; 93 } else { 94 r0 = 1; 95 r2 = (unsigned int)env_get("bootargs"); 96 } 97 98 cleanup_before_linux(); 99 100 if (!fake) 101 board_jump_and_run(kernel_entry, r0, 0, r2); 102 } 103 104 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) 105 { 106 /* No need for those on ARC */ 107 if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE)) 108 return -1; 109 110 if (flag & BOOTM_STATE_OS_PREP) 111 return boot_prep_linux(images); 112 113 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { 114 boot_jump_linux(images, flag); 115 return 0; 116 } 117 118 return -1; 119 } 120