GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/m68k/lib/bootm.c

@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <env.h>
+#include <image.h>
+#include <u-boot/zlib.h>
+#include <bzlib.h>
+#include <watchdog.h>
+#include <asm/byteorder.h>
+#ifdef CONFIG_SHOW_BOOT_PROGRESS
+# include <status_led.h>
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define PHYSADDR(x) x
+
+#define LINUX_MAX_ENVS		256
+#define LINUX_MAX_ARGS		256
+
+static ulong get_sp (void);
+static void set_clocks_in_mhz (bd_t *kbd);
+
+void arch_lmb_reserve(struct lmb *lmb)
+{
+	ulong sp;
+
+	/*
+	 * Booting a (Linux) kernel image
+	 *
+	 * Allocate space for command line and board info - the
+	 * address should be as high as possible within the reach of
+	 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
+	 * memory, which means far enough below the current stack
+	 * pointer.
+	 */
+	sp = get_sp();
+	debug ("## Current stack ends at 0x%08lx ", sp);
+
+	/* adjust sp by 1K to be safe */
+	sp -= 1024;
+	lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
+}
+
+int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
+{
+	int ret;
+	bd_t  *kbd;
+	void  (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
+	struct lmb *lmb = &images->lmb;
+
+	/*
+	 * allow the PREP bootm subcommand, it is required for bootm to work
+	 */
+	if (flag & BOOTM_STATE_OS_PREP)
+		return 0;
+
+	if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
+		return 1;
+
+	/* allocate space for kernel copy of board info */
+	ret = boot_get_kbd (lmb, &kbd);
+	if (ret) {
+		puts("ERROR with allocation of kernel bd\n");
+		goto error;
+	}
+	set_clocks_in_mhz(kbd);
+
+	ret = image_setup_linux(images);
+	if (ret)
+		goto error;
+
+	kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep;
+
+	debug("## Transferring control to Linux (at address %08lx) ...\n",
+	      (ulong) kernel);
+
+	bootstage_mark(BOOTSTAGE_ID_RUN_OS);
+
+	/*
+	 * Linux Kernel Parameters (passing board info data):
+	 *   sp+00: Ignore, side effect of using jsr to jump to kernel
+	 *   sp+04: ptr to board info data
+	 *   sp+08: initrd_start or 0 if no initrd
+	 *   sp+12: initrd_end - unused if initrd_start is 0
+	 *   sp+16: Start of command line string
+	 *   sp+20: End   of command line string
+	 */
+	(*kernel)(kbd, images->initrd_start, images->initrd_end,
+		  images->cmdline_start, images->cmdline_end);
+	/* does not return */
+error:
+	return 1;
+}
+
+static ulong get_sp (void)
+{
+	ulong sp;
+
+	asm("movel %%a7, %%d0\n"
+	    "movel %%d0, %0\n": "=d"(sp): :"%d0");
+
+	return sp;
+}
+
+static void set_clocks_in_mhz (bd_t *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;
+	}
+}