1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
9 DECLARE_GLOBAL_DATA_PTR;
11 static ulong get_sp(void)
15 asm("mov %0, sp" : "=r"(ret) : );
19 void arch_lmb_reserve(struct lmb *lmb)
24 * Booting a (Linux) kernel image
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
33 debug("## Current stack ends at 0x%08lx ", sp);
35 /* adjust sp by 4K to be safe */
37 lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
40 static int cleanup_before_linux(void)
43 sync_n_cleanup_cache_all();
48 __weak int board_prep_linux(bootm_headers_t *images) { return 0; }
50 /* Subcommand: PREP */
51 static int boot_prep_linux(bootm_headers_t *images)
55 ret = image_setup_linux(images);
59 return board_prep_linux(images);
62 /* Generic implementation for single core CPU */
63 __weak void board_jump_and_run(ulong entry, int zero, int arch, uint params)
65 void (*kernel_entry)(int zero, int arch, uint params);
67 kernel_entry = (void (*)(int, int, uint))entry;
69 kernel_entry(zero, arch, params);
73 static void boot_jump_linux(bootm_headers_t *images, int flag)
77 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
79 kernel_entry = images->ep;
81 debug("## Transferring control to Linux (at address %08lx)...\n",
83 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
85 printf("\nStarting kernel ...%s\n\n", fake ?
86 "(fake run for tracing)" : "");
87 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
89 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
91 r2 = (unsigned int)images->ft_addr;
94 r2 = (unsigned int)env_get("bootargs");
97 cleanup_before_linux();
100 board_jump_and_run(kernel_entry, r0, 0, r2);
103 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
105 /* No need for those on ARC */
106 if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE))
109 if (flag & BOOTM_STATE_OS_PREP)
110 return boot_prep_linux(images);
112 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
113 boot_jump_linux(images, flag);