2 * Misc. bootloader code for many machines. This assumes you have are using
3 * a 6xx/7xx/74xx CPU in your machine. This assumes the chunk of memory
4 * below 8MB is free. Finally, it assumes you have a NS16550-style uart for
5 * your serial console. If a machine meets these requirements, it can quite
6 * likely use this code during boot.
8 * Author: Matt Porter <mporter@mvista.com>
9 * Derived from arch/ppc/boot/prep/misc.c
11 * 2001 (c) MontaVista, Software, Inc. This file is licensed under
12 * the terms of the GNU General Public License version 2. This program
13 * is licensed "as is" without any warranty of any kind, whether express
17 #include <linux/types.h>
18 #include <linux/string.h>
22 #include <asm/bootinfo.h>
24 #include <asm/ibm4xx.h>
32 #define CMDLINE CONFIG_CMDLINE
37 /* Keyboard (and VGA console)? */
38 #ifdef CONFIG_VGA_CONSOLE
44 /* Will / Can the user give input?
46 #if (defined(CONFIG_SERIAL_8250_CONSOLE) \
47 || defined(CONFIG_VGA_CONSOLE) \
48 || defined(CONFIG_SERIAL_MPC52xx_CONSOLE) \
49 || defined(CONFIG_SERIAL_MPSC_CONSOLE))
50 #define INTERACTIVE_CONSOLE 1
56 char cmd_preset[] = CMDLINE;
58 char *cmd_line = cmd_buf;
59 int keyb_present = HAS_KEYB;
62 unsigned long com_port;
63 unsigned long initrd_size = 0;
65 /* The linker tells us various locations in the image */
66 extern char __image_begin, __image_end;
67 extern char __ramdisk_begin, __ramdisk_end;
69 /* Original location */
70 extern unsigned long start;
72 extern int CRT_tstc(void);
73 extern unsigned long serial_init(int chan, void *ignored);
74 extern void serial_close(unsigned long com_port);
75 extern void gunzip(void *, int, unsigned char *, int *);
76 extern void serial_fixups(void);
78 /* Allow get_mem_size to be hooked into. This is the default. */
79 unsigned long __attribute__ ((weak))
85 #if defined(CONFIG_40x)
86 #define PPC4xx_EMAC0_MR0 EMAC0_BASE
89 #if defined(CONFIG_44x) && defined(PPC44x_EMAC0_MR0)
90 #define PPC4xx_EMAC0_MR0 PPC44x_EMAC0_MR0
94 decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
96 #ifdef INTERACTIVE_CONSOLE
101 struct bi_record *rec;
102 unsigned long initrd_loc = 0, TotalMemory = 0;
104 #if defined(CONFIG_SERIAL_8250_CONSOLE) || defined(CONFIG_SERIAL_MPSC_CONSOLE)
105 com_port = serial_init(0, NULL);
108 #if defined(PPC4xx_EMAC0_MR0)
110 mtdcr(DCRN_MALCR(DCRN_MAL_BASE), MALCR_MMSR);
112 while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE)) & MALCR_MMSR) {};
114 *(volatile unsigned long *)PPC4xx_EMAC0_MR0 = 0x20000000;
115 __asm__ __volatile__("eieio");
119 * Call get_mem_size(), which is memory controller dependent,
120 * and we must have the correct file linked in here.
122 TotalMemory = get_mem_size();
124 /* assume the chunk below 8M is free */
125 end_avail = (char *)0x00800000;
128 * Reveal where we were loaded at and where we
131 puts("loaded at: "); puthex(load_addr);
132 puts(" "); puthex((unsigned long)(load_addr + (4*num_words)));
134 if ( (unsigned long)load_addr != (unsigned long)&start )
136 puts("relocated to: "); puthex((unsigned long)&start);
138 puthex((unsigned long)((unsigned long)&start + (4*num_words)));
143 * We link ourself to 0x00800000. When we run, we relocate
144 * ourselves there. So we just need __image_begin for the
147 zimage_start = (char *)(unsigned long)(&__image_begin);
148 zimage_size = (unsigned long)(&__image_end) -
149 (unsigned long)(&__image_begin);
151 initrd_size = (unsigned long)(&__ramdisk_end) -
152 (unsigned long)(&__ramdisk_begin);
155 * The zImage and initrd will be between start and _end, so they've
156 * already been moved once. We're good to go now. -- Tom
158 avail_ram = (char *)PAGE_ALIGN((unsigned long)_end);
159 puts("zimage at: "); puthex((unsigned long)zimage_start);
160 puts(" "); puthex((unsigned long)(zimage_size+zimage_start));
165 puthex((unsigned long)(&__ramdisk_begin));
166 puts(" "); puthex((unsigned long)(&__ramdisk_end));puts("\n");
169 #ifndef CONFIG_40x /* don't overwrite the 40x image located at 0x00400000! */
170 avail_ram = (char *)0x00400000;
172 end_avail = (char *)0x00800000;
173 puts("avail ram: "); puthex((unsigned long)avail_ram); puts(" ");
174 puthex((unsigned long)end_avail); puts("\n");
177 CRT_tstc(); /* Forces keyboard to be initialized */
179 /* Display standard Linux/PPC boot prompt for kernel args */
180 puts("\nLinux/PPC load: ");
182 memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
183 while ( *cp ) putc(*cp++);
185 #ifdef INTERACTIVE_CONSOLE
187 * If they have a console, allow them to edit the command line.
188 * Otherwise, don't bother wasting the five seconds.
190 while (timer++ < 5*1000) {
192 while ((ch = getc()) != '\n' && ch != '\r') {
193 /* Test for backspace/delete */
194 if (ch == '\b' || ch == '\177') {
195 if (cp != cmd_line) {
199 /* Test for ^x/^u (and wipe the line) */
200 } else if (ch == '\030' || ch == '\025') {
201 while (cp != cmd_line) {
210 break; /* Exit 'timer' loop */
212 udelay(1000); /* 1 msec */
218 puts("Uncompressing Linux...");
219 gunzip(NULL, 0x400000, zimage_start, &zimage_size);
222 /* get the bi_rec address */
223 rec = bootinfo_addr(zimage_size);
225 /* We need to make sure that the initrd and bi_recs do not
228 unsigned long rec_loc = (unsigned long) rec;
229 initrd_loc = (unsigned long)(&__ramdisk_begin);
230 /* If the bi_recs are in the middle of the current
231 * initrd, move the initrd to the next MB
233 if ((rec_loc > initrd_loc) &&
234 ((initrd_loc + initrd_size) > rec_loc)) {
235 initrd_loc = _ALIGN((unsigned long)(zimage_size)
236 + (2 << 20) - 1, (2 << 20));
237 memmove((void *)initrd_loc, &__ramdisk_begin,
239 puts("initrd moved: "); puthex(initrd_loc);
240 puts(" "); puthex(initrd_loc + initrd_size);
247 bootinfo_append(BI_MEMSIZE, sizeof(int), (void*)&TotalMemory);
249 bootinfo_append(BI_CMD_LINE, strlen(cmd_line)+1, (void*)cmd_line);
251 /* add a bi_rec for the initrd if it exists */
253 unsigned long initrd[2];
255 initrd[0] = initrd_loc;
256 initrd[1] = initrd_size;
258 bootinfo_append(BI_INITRD, sizeof(initrd), &initrd);
260 puts("Now booting the kernel\n");
261 serial_close(com_port);
266 void __attribute__ ((weak))
271 /* Allow decompress_kernel to be hooked into. This is the default. */
272 void * __attribute__ ((weak))
273 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
274 void *ign1, void *ign2)
277 return decompress_kernel(load_addr, num_words, cksum);