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