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 int arch_fixup_fdt(void *blob) 41 { 42 return 0; 43 } 44 45 static int cleanup_before_linux(void) 46 { 47 disable_interrupts(); 48 flush_dcache_all(); 49 invalidate_icache_all(); 50 51 return 0; 52 } 53 54 /* Subcommand: PREP */ 55 static void boot_prep_linux(bootm_headers_t *images) 56 { 57 if (image_setup_linux(images)) 58 hang(); 59 } 60 61 __weak void smp_set_core_boot_addr(unsigned long addr, int corenr) {} 62 __weak void smp_kick_all_cpus(void) {} 63 64 /* Subcommand: GO */ 65 static void boot_jump_linux(bootm_headers_t *images, int flag) 66 { 67 void (*kernel_entry)(int zero, int arch, uint params); 68 unsigned int r0, r2; 69 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 70 71 kernel_entry = (void (*)(int, int, uint))images->ep; 72 73 debug("## Transferring control to Linux (at address %08lx)...\n", 74 (ulong) kernel_entry); 75 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 76 77 printf("\nStarting kernel ...%s\n\n", fake ? 78 "(fake run for tracing)" : ""); 79 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); 80 81 cleanup_before_linux(); 82 83 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { 84 r0 = 2; 85 r2 = (unsigned int)images->ft_addr; 86 } else { 87 r0 = 1; 88 r2 = (unsigned int)env_get("bootargs"); 89 } 90 91 if (!fake) { 92 smp_set_core_boot_addr((unsigned long)kernel_entry, -1); 93 smp_kick_all_cpus(); 94 kernel_entry(r0, 0, r2); 95 } 96 } 97 98 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) 99 { 100 /* No need for those on ARC */ 101 if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE)) 102 return -1; 103 104 if (flag & BOOTM_STATE_OS_PREP) { 105 boot_prep_linux(images); 106 return 0; 107 } 108 109 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { 110 boot_jump_linux(images, flag); 111 return 0; 112 } 113 114 boot_prep_linux(images); 115 boot_jump_linux(images, flag); 116 return 0; 117 } 118