arch/powerpc/boot/main.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) Paul Mackerras 1997.
  *
  * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
  */
 #include <stdarg.h>
 #include <stddef.h>
 #include "elf.h"
 #include "page.h"
 #include "string.h"
 #include "stdio.h"
 #include "ops.h"
 #include "reg.h"

 struct addr_range {
 	void *addr;
 	unsigned long size;
 };

 #undef DEBUG

 static struct addr_range prep_kernel(void)
 {
 	char elfheader[256];
 	unsigned char *vmlinuz_addr = (unsigned char *)_vmlinux_start;
 	unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start;
 	void *addr = 0;
 	struct elf_info ei;
 	long len;
 	int uncompressed_image = 0;

 	len = partial_decompress(vmlinuz_addr, vmlinuz_size,
 		elfheader, sizeof(elfheader), 0);
 	/* assume uncompressed data if -1 is returned */
 	if (len == -1) {
 		uncompressed_image = 1;
 		memcpy(elfheader, vmlinuz_addr, sizeof(elfheader));
 		printf("No valid compressed data found, assume uncompressed data\n\r");
 	}

 	if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei))
 		fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r");

 	if (platform_ops.image_hdr)
 		platform_ops.image_hdr(elfheader);

 	/* We need to alloc the memsize: gzip will expand the kernel
 	 * text/data, then possible rubbish we don't care about. But
 	 * the kernel bss must be claimed (it will be zero'd by the
 	 * kernel itself)
 	 */
 	printf("Allocating 0x%lx bytes for kernel...\n\r", ei.memsize);

 	if (platform_ops.vmlinux_alloc) {
 		addr = platform_ops.vmlinux_alloc(ei.memsize);
 	} else {
 		/*
 		 * Check if the kernel image (without bss) would overwrite the
 		 * bootwrapper. The device tree has been moved in fdt_init()
 		 * to an area allocated with malloc() (somewhere past _end).
 		 */
 		if ((unsigned long)_start < ei.loadsize)
 			fatal("Insufficient memory for kernel at address 0!"
 			       " (_start=%p, uncompressed size=%08lx)\n\r",
 			       _start, ei.loadsize);

 		if ((unsigned long)_end < ei.memsize)
 			fatal("The final kernel image would overwrite the "
 					"device tree\n\r");
 	}

 	if (uncompressed_image) {
 		memcpy(addr, vmlinuz_addr + ei.elfoffset, ei.loadsize);
 		printf("0x%lx bytes of uncompressed data copied\n\r",
 		       ei.loadsize);
 		goto out;
 	}

 	/* Finally, decompress the kernel */
 	printf("Decompressing (0x%p <- 0x%p:0x%p)...\n\r", addr,
 	       vmlinuz_addr, vmlinuz_addr+vmlinuz_size);

 	len = partial_decompress(vmlinuz_addr, vmlinuz_size,
 		addr, ei.loadsize, ei.elfoffset);

 	if (len < 0)
 		fatal("Decompression failed with error code %ld\n\r", len);

 	if (len != ei.loadsize)
 		 fatal("Decompression error: got 0x%lx bytes, expected 0x%lx.\n\r",
 			 len, ei.loadsize);

 	printf("Done! Decompressed 0x%lx bytes\n\r", len);
 out:
 	flush_cache(addr, ei.loadsize);

 	return (struct addr_range){addr, ei.memsize};
 }

 static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen,
 				     unsigned long initrd_addr,
 				     unsigned long initrd_size)
 {
 	/* If we have an image attached to us, it overrides anything
 	 * supplied by the loader. */
 	if (&_initrd_end > &_initrd_start) {
 		printf("Attached initrd image at 0x%p-0x%p\n\r",
 		       _initrd_start, _initrd_end);
 		initrd_addr = (unsigned long)_initrd_start;
 		initrd_size = _initrd_end - _initrd_start;
 	} else if (initrd_size > 0) {
 		printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r",
 		       initrd_addr, initrd_addr + initrd_size);
 	}

 	/* If there's no initrd at all, we're done */
 	if (! initrd_size)
 		return (struct addr_range){0, 0};

 	/*
 	 * If the initrd is too low it will be clobbered when the
 	 * kernel relocates to its final location.  In this case,
 	 * allocate a safer place and move it.
 	 */
 	if (initrd_addr < vmlinux.size) {
 		void *old_addr = (void *)initrd_addr;

 		printf("Allocating 0x%lx bytes for initrd ...\n\r",
 		       initrd_size);
 		initrd_addr = (unsigned long)malloc(initrd_size);
 		if (! initrd_addr)
 			fatal("Can't allocate memory for initial "
 			       "ramdisk !\n\r");
 		printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r",
 		       initrd_addr, old_addr, initrd_size);
 		memmove((void *)initrd_addr, old_addr, initrd_size);
 	}

 	printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr));

 	/* Tell the kernel initrd address via device tree */
 	setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
 	setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));

 	return (struct addr_range){(void *)initrd_addr, initrd_size};
 }

 #ifdef __powerpc64__
 static void prep_esm_blob(struct addr_range vmlinux, void *chosen)
 {
 	unsigned long esm_blob_addr, esm_blob_size;

 	/* Do we have an ESM (Enter Secure Mode) blob? */
 	if (&_esm_blob_end <= &_esm_blob_start)
 		return;

 	printf("Attached ESM blob at 0x%p-0x%p\n\r",
 	       _esm_blob_start, _esm_blob_end);
 	esm_blob_addr = (unsigned long)_esm_blob_start;
 	esm_blob_size = _esm_blob_end - _esm_blob_start;

 	/*
 	 * If the ESM blob is too low it will be clobbered when the
 	 * kernel relocates to its final location.  In this case,
 	 * allocate a safer place and move it.
 	 */
 	if (esm_blob_addr < vmlinux.size) {
 		void *old_addr = (void *)esm_blob_addr;

 		printf("Allocating 0x%lx bytes for esm_blob ...\n\r",
 		       esm_blob_size);
 		esm_blob_addr = (unsigned long)malloc(esm_blob_size);
 		if (!esm_blob_addr)
 			fatal("Can't allocate memory for ESM blob !\n\r");
 		printf("Relocating ESM blob 0x%lx <- 0x%p (0x%lx bytes)\n\r",
 		       esm_blob_addr, old_addr, esm_blob_size);
 		memmove((void *)esm_blob_addr, old_addr, esm_blob_size);
 	}

 	/* Tell the kernel ESM blob address via device tree. */
 	setprop_val(chosen, "linux,esm-blob-start", (u32)(esm_blob_addr));
 	setprop_val(chosen, "linux,esm-blob-end", (u32)(esm_blob_addr + esm_blob_size));
 }
 #else
 static inline void prep_esm_blob(struct addr_range vmlinux, void *chosen) { }
 #endif

 /* A buffer that may be edited by tools operating on a zImage binary so as to
  * edit the command line passed to vmlinux (by setting /chosen/bootargs).
  * The buffer is put in it's own section so that tools may locate it easier.
  */
 static char cmdline[BOOT_COMMAND_LINE_SIZE]
 	__attribute__((__section__("__builtin_cmdline")));

 static void prep_cmdline(void *chosen)
 {
 	unsigned int getline_timeout = 5000;
 	int v;
 	int n;

 	/* Wait-for-input time */
 	n = getprop(chosen, "linux,cmdline-timeout", &v, sizeof(v));
 	if (n == sizeof(v))
 		getline_timeout = v;

 	if (cmdline[0] == '\0')
 		getprop(chosen, "bootargs", cmdline, BOOT_COMMAND_LINE_SIZE-1);

 	printf("\n\rLinux/PowerPC load: %s", cmdline);

 	/* If possible, edit the command line */
 	if (console_ops.edit_cmdline && getline_timeout)
 		console_ops.edit_cmdline(cmdline, BOOT_COMMAND_LINE_SIZE, getline_timeout);

 	printf("\n\r");

 	/* Put the command line back into the devtree for the kernel */
 	setprop_str(chosen, "bootargs", cmdline);
 }

 struct platform_ops platform_ops;
 struct dt_ops dt_ops;
 struct console_ops console_ops;
 struct loader_info loader_info;

 void start(void)
 {
 	struct addr_range vmlinux, initrd;
 	kernel_entry_t kentry;
 	unsigned long ft_addr = 0;
 	void *chosen;

 	/* Do this first, because malloc() could clobber the loader's
 	 * command line.  Only use the loader command line if a
 	 * built-in command line wasn't set by an external tool */
 	if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0'))
 		memmove(cmdline, loader_info.cmdline,
 			min(loader_info.cmdline_len, BOOT_COMMAND_LINE_SIZE-1));

 	if (console_ops.open && (console_ops.open() < 0))
 		exit();
 	if (platform_ops.fixups)
 		platform_ops.fixups();

 	printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
 	       _start, get_sp());

 	/* Ensure that the device tree has a /chosen node */
 	chosen = finddevice("/chosen");
 	if (!chosen)
 		chosen = create_node(NULL, "chosen");

 	vmlinux = prep_kernel();
 	initrd = prep_initrd(vmlinux, chosen,
 			     loader_info.initrd_addr, loader_info.initrd_size);
 	prep_esm_blob(vmlinux, chosen);
 	prep_cmdline(chosen);

 	printf("Finalizing device tree...");
 	if (dt_ops.finalize)
 		ft_addr = dt_ops.finalize();
 	if (ft_addr)
 		printf(" flat tree at 0x%lx\n\r", ft_addr);
 	else
 		printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr);

 	if (console_ops.close)
 		console_ops.close();

 	kentry = (kernel_entry_t) vmlinux.addr;
 	if (ft_addr) {
 		if(platform_ops.kentry)
 			platform_ops.kentry(ft_addr, vmlinux.addr);
 		else
 			kentry(ft_addr, 0, NULL);
 	}
 	else
 		kentry((unsigned long)initrd.addr, initrd.size,
 		       loader_info.promptr);

 	/* console closed so printf in fatal below may not work */
 	fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r");
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Copyright (C) Paul Mackerras 1997.
	*
	* Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
	*/
	#include <stdarg.h>
	#include <stddef.h>
	#include "elf.h"
	#include "page.h"
	#include "string.h"
	#include "stdio.h"
	#include "ops.h"
	#include "reg.h"

	struct addr_range {
	void *addr;
	unsigned long size;
	};

	#undef DEBUG

	static struct addr_range prep_kernel(void)
	{
	char elfheader[256];
	unsigned char vmlinuz_addr = (unsigned char )_vmlinux_start;
	unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start;
	void *addr = 0;
	struct elf_info ei;
	long len;
	int uncompressed_image = 0;

	len = partial_decompress(vmlinuz_addr, vmlinuz_size,
	elfheader, sizeof(elfheader), 0);
	/* assume uncompressed data if -1 is returned */
	if (len == -1) {
	uncompressed_image = 1;
	memcpy(elfheader, vmlinuz_addr, sizeof(elfheader));
	printf("No valid compressed data found, assume uncompressed data\n\r");
	}

	if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei))
	fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r");

	if (platform_ops.image_hdr)
	platform_ops.image_hdr(elfheader);

	/* We need to alloc the memsize: gzip will expand the kernel
	* text/data, then possible rubbish we don't care about. But
	* the kernel bss must be claimed (it will be zero'd by the
	* kernel itself)
	*/
	printf("Allocating 0x%lx bytes for kernel...\n\r", ei.memsize);

	if (platform_ops.vmlinux_alloc) {
	addr = platform_ops.vmlinux_alloc(ei.memsize);
	} else {
	/*
	* Check if the kernel image (without bss) would overwrite the
	* bootwrapper. The device tree has been moved in fdt_init()
	* to an area allocated with malloc() (somewhere past _end).
	*/
	if ((unsigned long)_start < ei.loadsize)
	fatal("Insufficient memory for kernel at address 0!"
	" (_start=%p, uncompressed size=%08lx)\n\r",
	_start, ei.loadsize);

	if ((unsigned long)_end < ei.memsize)
	fatal("The final kernel image would overwrite the "
	"device tree\n\r");
	}

	if (uncompressed_image) {
	memcpy(addr, vmlinuz_addr + ei.elfoffset, ei.loadsize);
	printf("0x%lx bytes of uncompressed data copied\n\r",
	ei.loadsize);
	goto out;
	}

	/* Finally, decompress the kernel */
	printf("Decompressing (0x%p <- 0x%p:0x%p)...\n\r", addr,
	vmlinuz_addr, vmlinuz_addr+vmlinuz_size);

	len = partial_decompress(vmlinuz_addr, vmlinuz_size,
	addr, ei.loadsize, ei.elfoffset);

	if (len < 0)
	fatal("Decompression failed with error code %ld\n\r", len);

	if (len != ei.loadsize)
	fatal("Decompression error: got 0x%lx bytes, expected 0x%lx.\n\r",
	len, ei.loadsize);

	printf("Done! Decompressed 0x%lx bytes\n\r", len);
	out:
	flush_cache(addr, ei.loadsize);

	return (struct addr_range){addr, ei.memsize};
	}

	static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen,
	unsigned long initrd_addr,
	unsigned long initrd_size)
	{
	/* If we have an image attached to us, it overrides anything
	* supplied by the loader. */
	if (&_initrd_end > &_initrd_start) {
	printf("Attached initrd image at 0x%p-0x%p\n\r",
	_initrd_start, _initrd_end);
	initrd_addr = (unsigned long)_initrd_start;
	initrd_size = _initrd_end - _initrd_start;
	} else if (initrd_size > 0) {
	printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r",
	initrd_addr, initrd_addr + initrd_size);
	}

	/* If there's no initrd at all, we're done */
	if (! initrd_size)
	return (struct addr_range){0, 0};

	/*
	* If the initrd is too low it will be clobbered when the
	* kernel relocates to its final location. In this case,
	* allocate a safer place and move it.
	*/
	if (initrd_addr < vmlinux.size) {
	void old_addr = (void )initrd_addr;

	printf("Allocating 0x%lx bytes for initrd ...\n\r",
	initrd_size);
	initrd_addr = (unsigned long)malloc(initrd_size);
	if (! initrd_addr)
	fatal("Can't allocate memory for initial "
	"ramdisk !\n\r");
	printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r",
	initrd_addr, old_addr, initrd_size);
	memmove((void *)initrd_addr, old_addr, initrd_size);
	}

	printf("initrd head: 0x%lx\n\r", ((unsigned long )initrd_addr));

	/* Tell the kernel initrd address via device tree */
	setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
	setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));

	return (struct addr_range){(void *)initrd_addr, initrd_size};
	}

	#ifdef __powerpc64__
	static void prep_esm_blob(struct addr_range vmlinux, void *chosen)
	{
	unsigned long esm_blob_addr, esm_blob_size;

	/* Do we have an ESM (Enter Secure Mode) blob? */
	if (&_esm_blob_end <= &_esm_blob_start)
	return;

	printf("Attached ESM blob at 0x%p-0x%p\n\r",
	_esm_blob_start, _esm_blob_end);
	esm_blob_addr = (unsigned long)_esm_blob_start;
	esm_blob_size = _esm_blob_end - _esm_blob_start;

	/*
	* If the ESM blob is too low it will be clobbered when the
	* kernel relocates to its final location. In this case,
	* allocate a safer place and move it.
	*/
	if (esm_blob_addr < vmlinux.size) {
	void old_addr = (void )esm_blob_addr;

	printf("Allocating 0x%lx bytes for esm_blob ...\n\r",
	esm_blob_size);
	esm_blob_addr = (unsigned long)malloc(esm_blob_size);
	if (!esm_blob_addr)
	fatal("Can't allocate memory for ESM blob !\n\r");
	printf("Relocating ESM blob 0x%lx <- 0x%p (0x%lx bytes)\n\r",
	esm_blob_addr, old_addr, esm_blob_size);
	memmove((void *)esm_blob_addr, old_addr, esm_blob_size);
	}

	/* Tell the kernel ESM blob address via device tree. */
	setprop_val(chosen, "linux,esm-blob-start", (u32)(esm_blob_addr));
	setprop_val(chosen, "linux,esm-blob-end", (u32)(esm_blob_addr + esm_blob_size));
	}
	#else
	static inline void prep_esm_blob(struct addr_range vmlinux, void *chosen) { }
	#endif

	/* A buffer that may be edited by tools operating on a zImage binary so as to
	* edit the command line passed to vmlinux (by setting /chosen/bootargs).
	* The buffer is put in it's own section so that tools may locate it easier.
	*/
	static char cmdline[BOOT_COMMAND_LINE_SIZE]
	__attribute__((__section__("__builtin_cmdline")));

	static void prep_cmdline(void *chosen)
	{
	unsigned int getline_timeout = 5000;
	int v;
	int n;

	/* Wait-for-input time */
	n = getprop(chosen, "linux,cmdline-timeout", &v, sizeof(v));
	if (n == sizeof(v))
	getline_timeout = v;

	if (cmdline[0] == '\0')
	getprop(chosen, "bootargs", cmdline, BOOT_COMMAND_LINE_SIZE-1);

	printf("\n\rLinux/PowerPC load: %s", cmdline);

	/* If possible, edit the command line */
	if (console_ops.edit_cmdline && getline_timeout)
	console_ops.edit_cmdline(cmdline, BOOT_COMMAND_LINE_SIZE, getline_timeout);

	printf("\n\r");

	/* Put the command line back into the devtree for the kernel */
	setprop_str(chosen, "bootargs", cmdline);
	}

	struct platform_ops platform_ops;
	struct dt_ops dt_ops;
	struct console_ops console_ops;
	struct loader_info loader_info;

	void start(void)
	{
	struct addr_range vmlinux, initrd;
	kernel_entry_t kentry;
	unsigned long ft_addr = 0;
	void *chosen;

	/* Do this first, because malloc() could clobber the loader's
	* command line. Only use the loader command line if a
	* built-in command line wasn't set by an external tool */
	if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0'))
	memmove(cmdline, loader_info.cmdline,
	min(loader_info.cmdline_len, BOOT_COMMAND_LINE_SIZE-1));

	if (console_ops.open && (console_ops.open() < 0))
	exit();
	if (platform_ops.fixups)
	platform_ops.fixups();

	printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
	_start, get_sp());

	/* Ensure that the device tree has a /chosen node */
	chosen = finddevice("/chosen");
	if (!chosen)
	chosen = create_node(NULL, "chosen");

	vmlinux = prep_kernel();
	initrd = prep_initrd(vmlinux, chosen,
	loader_info.initrd_addr, loader_info.initrd_size);
	prep_esm_blob(vmlinux, chosen);
	prep_cmdline(chosen);

	printf("Finalizing device tree...");
	if (dt_ops.finalize)
	ft_addr = dt_ops.finalize();
	if (ft_addr)
	printf(" flat tree at 0x%lx\n\r", ft_addr);
	else
	printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr);

	if (console_ops.close)
	console_ops.close();

	kentry = (kernel_entry_t) vmlinux.addr;
	if (ft_addr) {
	if(platform_ops.kentry)
	platform_ops.kentry(ft_addr, vmlinux.addr);
	else
	kentry(ft_addr, 0, NULL);
	}
	else
	kentry((unsigned long)initrd.addr, initrd.size,
	loader_info.promptr);

	/* console closed so printf in fatal below may not work */
	fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r");
	}