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      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