v4.19.13 snapshot.
diff --git a/arch/powerpc/boot/main.c b/arch/powerpc/boot/main.c
new file mode 100644
index 0000000..78aaf4f
--- /dev/null
+++ b/arch/powerpc/boot/main.c
@@ -0,0 +1,247 @@
+/*
+ * Copyright (C) Paul Mackerras 1997.
+ *
+ * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#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};
+}
+
+/* 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_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");
+}