U-Boot

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2008 Semihalf
 *
 * (C) Copyright 2000-2006
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 */

#include <config.h>
#include <bootm.h>
#include <bootstage.h>
#include <cpu_func.h>
#include <env.h>
#include <init.h>
#include <log.h>
#include <watchdog.h>
#include <command.h>
#include <image.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <u-boot/zlib.h>
#include <bzlib.h>
#include <asm/byteorder.h>
#include <asm/mp.h>
#include <bootm.h>
#include <vxworks.h>

#if defined(CONFIG_OF_LIBFDT)
#include <linux/libfdt.h>
#include <fdt_support.h>
#endif

#ifdef CONFIG_SYS_INIT_RAM_LOCK
#include <asm/cache.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

extern void ft_fixup_num_cores(void *blob);
static void set_clocks_in_mhz (struct bd_info *kbd);

static void boot_jump_linux(struct bootm_headers *images)
{
	void	(*kernel)(struct bd_info *, ulong r4, ulong r5, ulong r6,
			      ulong r7, ulong r8, ulong r9);
#ifdef CONFIG_OF_LIBFDT
	char *of_flat_tree = images->ft_addr;
#endif

	kernel = (void (*)(struct bd_info *, ulong, ulong, ulong,
			   ulong, ulong, ulong))images->ep;
	debug("## Transferring control to Linux (at address %08lx) ...\n",
	      (ulong)kernel);

	bootstage_mark(BOOTSTAGE_ID_RUN_OS);

#ifdef CONFIG_BOOTSTAGE_FDT
	bootstage_fdt_add_report();
#endif
#ifdef CONFIG_BOOTSTAGE_REPORT
	bootstage_report();
#endif

#if defined(CONFIG_SYS_INIT_RAM_LOCK) && !defined(CONFIG_E500)
	unlock_ram_in_cache();
#endif

#if defined(CONFIG_OF_LIBFDT)
	if (of_flat_tree) {	/* device tree; boot new style */
		/*
		 * Linux Kernel Parameters (passing device tree):
		 *   r3: pointer to the fdt
		 *   r4: 0
		 *   r5: 0
		 *   r6: epapr magic
		 *   r7: size of IMA in bytes
		 *   r8: 0
		 *   r9: 0
		 */
		debug("   Booting using OF flat tree...\n");
		schedule();
		(*kernel) ((struct bd_info *)of_flat_tree, 0, 0, EPAPR_MAGIC,
			   env_get_bootm_mapsize(), 0, 0);
		/* does not return */
	} else
#endif
	{
		/*
		 * Linux Kernel Parameters (passing board info data):
		 *   r3: ptr to board info data
		 *   r4: initrd_start or 0 if no initrd
		 *   r5: initrd_end - unused if r4 is 0
		 *   r6: Start of command line string
		 *   r7: End   of command line string
		 *   r8: 0
		 *   r9: 0
		 */
		ulong cmd_start = images->cmdline_start;
		ulong cmd_end = images->cmdline_end;
		ulong initrd_start = images->initrd_start;
		ulong initrd_end = images->initrd_end;
		struct bd_info *kbd = images->kbd;

		debug("   Booting using board info...\n");
		schedule();
		(*kernel) (kbd, initrd_start, initrd_end,
			   cmd_start, cmd_end, 0, 0);
		/* does not return */
	}
	return;
}

static void boot_prep_linux(struct bootm_headers *images)
{
#ifdef CONFIG_MP
	/*
	 * if we are MP make sure to flush the device tree so any changes are
	 * made visibile to all other cores.  In AMP boot scenarios the cores
	 * might not be HW cache coherent with each other.
	 */
	flush_cache((unsigned long)images->ft_addr, images->ft_len);
#endif
}

static int boot_cmdline_linux(struct bootm_headers *images)
{
	ulong of_size = images->ft_len;
	ulong *cmd_start = &images->cmdline_start;
	ulong *cmd_end = &images->cmdline_end;

	int ret = 0;

	if (!of_size) {
		/* allocate space and init command line */
		ret = boot_get_cmdline(cmd_start, cmd_end);
		if (ret) {
			puts("ERROR with allocation of cmdline\n");
			return ret;
		}
	}

	return ret;
}

static int boot_bd_t_linux(struct bootm_headers *images)
{
	ulong of_size = images->ft_len;
	struct bd_info **kbd = &images->kbd;

	int ret = 0;

	if (!of_size) {
		/* allocate space for kernel copy of board info */
		ret = boot_get_kbd(kbd);
		if (ret) {
			puts("ERROR with allocation of kernel bd\n");
			return ret;
		}
		set_clocks_in_mhz(*kbd);
	}

	return ret;
}

static int boot_body_linux(struct bootm_headers *images)
{
	int ret;

	/* allocate space for kernel copy of board info */
	ret = boot_bd_t_linux(images);
	if (ret)
		return ret;

	if (IS_ENABLED(CONFIG_LMB)) {
		ret = image_setup_linux(images);
		if (ret)
			return ret;
	}

	return 0;
}

int do_bootm_linux(int flag, struct bootm_info *bmi)
{
	struct bootm_headers *images = bmi->images;
	int	ret;

	if (flag & BOOTM_STATE_OS_CMDLINE) {
		boot_cmdline_linux(images);
		return 0;
	}

	if (flag & BOOTM_STATE_OS_BD_T) {
		boot_bd_t_linux(images);
		return 0;
	}

	if (flag & BOOTM_STATE_OS_PREP) {
		boot_prep_linux(images);
		return 0;
	}

	boot_prep_linux(images);
	ret = boot_body_linux(images);
	if (ret)
		return ret;
	boot_jump_linux(images);

	return 0;
}

static void set_clocks_in_mhz (struct bd_info *kbd)
{
	char	*s;

	s = env_get("clocks_in_mhz");
	if (s) {
		/* convert all clock information to MHz */
		kbd->bi_intfreq /= 1000000L;
		kbd->bi_busfreq /= 1000000L;
	}
}

#if defined(CONFIG_BOOTM_VXWORKS)
void boot_prep_vxworks(struct bootm_headers *images)
{
#if defined(CONFIG_OF_LIBFDT)
	int off;
	u64 base, size;

	if (!images->ft_addr)
		return;

	base = (u64)gd->ram_base;
	size = (u64)gd->ram_size;

	off = fdt_path_offset(images->ft_addr, "/memory");
	if (off < 0)
		fdt_fixup_memory(images->ft_addr, base, size);

#if defined(CONFIG_MP)
#if defined(CONFIG_MPC85xx)
	ft_fixup_cpu(images->ft_addr, base + size);
	ft_fixup_num_cores(images->ft_addr);
#elif defined(CONFIG_MPC86xx)
	off = fdt_add_mem_rsv(images->ft_addr,
			determine_mp_bootpg(NULL), (u64)4096);
	if (off < 0)
		printf("## WARNING %s: %s\n", __func__, fdt_strerror(off));
	ft_fixup_num_cores(images->ft_addr);
#endif
	flush_cache((unsigned long)images->ft_addr, images->ft_len);
#endif
#endif
}

void boot_jump_vxworks(struct bootm_headers *images)
{
	/* PowerPC VxWorks boot interface conforms to the ePAPR standard
	 * general purpuse registers:
	 *
	 *	r3: Effective address of the device tree image
	 *	r4: 0
	 *	r5: 0
	 *	r6: ePAPR magic value
	 *	r7: shall be the size of the boot IMA in bytes
	 *	r8: 0
	 *	r9: 0
	 *	TCR: WRC = 0, no watchdog timer reset will occur
	 */
	schedule();

	((void (*)(void *, ulong, ulong, ulong,
		ulong, ulong, ulong))images->ep)(images->ft_addr,
		0, 0, EPAPR_MAGIC, env_get_bootm_mapsize(), 0, 0);
}
#endif