1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) Paul Mackerras 1997.
5 * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
23 static struct addr_range prep_kernel(void)
26 unsigned char *vmlinuz_addr = (unsigned char *)_vmlinux_start;
27 unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start;
31 int uncompressed_image = 0;
33 len = partial_decompress(vmlinuz_addr, vmlinuz_size,
34 elfheader, sizeof(elfheader), 0);
35 /* assume uncompressed data if -1 is returned */
37 uncompressed_image = 1;
38 memcpy(elfheader, vmlinuz_addr, sizeof(elfheader));
39 printf("No valid compressed data found, assume uncompressed data\n\r");
42 if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei))
43 fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
45 if (platform_ops.image_hdr)
46 platform_ops.image_hdr(elfheader);
48 /* We need to alloc the memsize: gzip will expand the kernel
49 * text/data, then possible rubbish we don't care about. But
50 * the kernel bss must be claimed (it will be zero'd by the
53 printf("Allocating 0x%lx bytes for kernel...\n\r", ei.memsize);
55 if (platform_ops.vmlinux_alloc) {
56 addr = platform_ops.vmlinux_alloc(ei.memsize);
59 * Check if the kernel image (without bss) would overwrite the
60 * bootwrapper. The device tree has been moved in fdt_init()
61 * to an area allocated with malloc() (somewhere past _end).
63 if ((unsigned long)_start < ei.loadsize)
64 fatal("Insufficient memory for kernel at address 0!"
65 " (_start=%p, uncompressed size=%08lx)\n\r",
68 if ((unsigned long)_end < ei.memsize)
69 fatal("The final kernel image would overwrite the "
73 if (uncompressed_image) {
74 memcpy(addr, vmlinuz_addr + ei.elfoffset, ei.loadsize);
75 printf("0x%lx bytes of uncompressed data copied\n\r",
80 /* Finally, decompress the kernel */
81 printf("Decompressing (0x%p <- 0x%p:0x%p)...\n\r", addr,
82 vmlinuz_addr, vmlinuz_addr+vmlinuz_size);
84 len = partial_decompress(vmlinuz_addr, vmlinuz_size,
85 addr, ei.loadsize, ei.elfoffset);
88 fatal("Decompression failed with error code %ld\n\r", len);
90 if (len != ei.loadsize)
91 fatal("Decompression error: got 0x%lx bytes, expected 0x%lx.\n\r",
94 printf("Done! Decompressed 0x%lx bytes\n\r", len);
96 flush_cache(addr, ei.loadsize);
98 return (struct addr_range){addr, ei.memsize};
101 static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen,
102 unsigned long initrd_addr,
103 unsigned long initrd_size)
105 /* If we have an image attached to us, it overrides anything
106 * supplied by the loader. */
107 if (_initrd_end > _initrd_start) {
108 printf("Attached initrd image at 0x%p-0x%p\n\r",
109 _initrd_start, _initrd_end);
110 initrd_addr = (unsigned long)_initrd_start;
111 initrd_size = _initrd_end - _initrd_start;
112 } else if (initrd_size > 0) {
113 printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r",
114 initrd_addr, initrd_addr + initrd_size);
117 /* If there's no initrd at all, we're done */
119 return (struct addr_range){0, 0};
122 * If the initrd is too low it will be clobbered when the
123 * kernel relocates to its final location. In this case,
124 * allocate a safer place and move it.
126 if (initrd_addr < vmlinux.size) {
127 void *old_addr = (void *)initrd_addr;
129 printf("Allocating 0x%lx bytes for initrd ...\n\r",
131 initrd_addr = (unsigned long)malloc(initrd_size);
133 fatal("Can't allocate memory for initial "
135 printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r",
136 initrd_addr, old_addr, initrd_size);
137 memmove((void *)initrd_addr, old_addr, initrd_size);
140 printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr));
142 /* Tell the kernel initrd address via device tree */
143 setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
144 setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));
146 return (struct addr_range){(void *)initrd_addr, initrd_size};
149 /* A buffer that may be edited by tools operating on a zImage binary so as to
150 * edit the command line passed to vmlinux (by setting /chosen/bootargs).
151 * The buffer is put in it's own section so that tools may locate it easier.
153 static char cmdline[BOOT_COMMAND_LINE_SIZE]
154 __attribute__((__section__("__builtin_cmdline")));
156 static void prep_cmdline(void *chosen)
158 unsigned int getline_timeout = 5000;
162 /* Wait-for-input time */
163 n = getprop(chosen, "linux,cmdline-timeout", &v, sizeof(v));
167 if (cmdline[0] == '\0')
168 getprop(chosen, "bootargs", cmdline, BOOT_COMMAND_LINE_SIZE-1);
170 printf("\n\rLinux/PowerPC load: %s", cmdline);
172 /* If possible, edit the command line */
173 if (console_ops.edit_cmdline && getline_timeout)
174 console_ops.edit_cmdline(cmdline, BOOT_COMMAND_LINE_SIZE, getline_timeout);
178 /* Put the command line back into the devtree for the kernel */
179 setprop_str(chosen, "bootargs", cmdline);
182 struct platform_ops platform_ops;
183 struct dt_ops dt_ops;
184 struct console_ops console_ops;
185 struct loader_info loader_info;
189 struct addr_range vmlinux, initrd;
190 kernel_entry_t kentry;
191 unsigned long ft_addr = 0;
194 /* Do this first, because malloc() could clobber the loader's
195 * command line. Only use the loader command line if a
196 * built-in command line wasn't set by an external tool */
197 if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0'))
198 memmove(cmdline, loader_info.cmdline,
199 min(loader_info.cmdline_len, BOOT_COMMAND_LINE_SIZE-1));
201 if (console_ops.open && (console_ops.open() < 0))
203 if (platform_ops.fixups)
204 platform_ops.fixups();
206 printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
209 /* Ensure that the device tree has a /chosen node */
210 chosen = finddevice("/chosen");
212 chosen = create_node(NULL, "chosen");
214 vmlinux = prep_kernel();
215 initrd = prep_initrd(vmlinux, chosen,
216 loader_info.initrd_addr, loader_info.initrd_size);
217 prep_cmdline(chosen);
219 printf("Finalizing device tree...");
221 ft_addr = dt_ops.finalize();
223 printf(" flat tree at 0x%lx\n\r", ft_addr);
225 printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr);
227 if (console_ops.close)
230 kentry = (kernel_entry_t) vmlinux.addr;
232 if(platform_ops.kentry)
233 platform_ops.kentry(ft_addr, vmlinux.addr);
235 kentry(ft_addr, 0, NULL);
238 kentry((unsigned long)initrd.addr, initrd.size,
239 loader_info.promptr);
241 /* console closed so printf in fatal below may not work */
242 fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r");