1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. 4 */ 5 6 #include <asm/cache.h> 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 sync_n_cleanup_cache_all(); 44 45 return 0; 46 } 47 48 __weak int board_prep_linux(bootm_headers_t *images) { return 0; } 49 50 /* Subcommand: PREP */ 51 static int boot_prep_linux(bootm_headers_t *images) 52 { 53 int ret; 54 55 ret = image_setup_linux(images); 56 if (ret) 57 return ret; 58 59 return board_prep_linux(images); 60 } 61 62 /* Generic implementation for single core CPU */ 63 __weak void board_jump_and_run(ulong entry, int zero, int arch, uint params) 64 { 65 void (*kernel_entry)(int zero, int arch, uint params); 66 67 kernel_entry = (void (*)(int, int, uint))entry; 68 69 kernel_entry(zero, arch, params); 70 } 71 72 /* Subcommand: GO */ 73 static void boot_jump_linux(bootm_headers_t *images, int flag) 74 { 75 ulong kernel_entry; 76 unsigned int r0, r2; 77 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 78 79 kernel_entry = images->ep; 80 81 debug("## Transferring control to Linux (at address %08lx)...\n", 82 kernel_entry); 83 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 84 85 printf("\nStarting kernel ...%s\n\n", fake ? 86 "(fake run for tracing)" : ""); 87 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); 88 89 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { 90 r0 = 2; 91 r2 = (unsigned int)images->ft_addr; 92 } else { 93 r0 = 1; 94 r2 = (unsigned int)env_get("bootargs"); 95 } 96 97 cleanup_before_linux(); 98 99 if (!fake) 100 board_jump_and_run(kernel_entry, r0, 0, r2); 101 } 102 103 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) 104 { 105 /* No need for those on ARC */ 106 if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE)) 107 return -1; 108 109 if (flag & BOOTM_STATE_OS_PREP) 110 return boot_prep_linux(images); 111 112 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { 113 boot_jump_linux(images, flag); 114 return 0; 115 } 116 117 return -1; 118 } 119