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/config.h>
19 #include <linux/string.h>
23 #include <asm/bootinfo.h>
25 #include <asm/ibm4xx.h>
33 #define CMDLINE CONFIG_CMDLINE
38 /* Keyboard (and VGA console)? */
39 #ifdef CONFIG_VGA_CONSOLE
45 /* Will / Can the user give input?
46 * Val Henson has requested that Gemini doesn't wait for the
47 * user to edit the cmdline or not.
49 #if (defined(CONFIG_SERIAL_8250_CONSOLE) \
50 || defined(CONFIG_VGA_CONSOLE) \
51 || defined(CONFIG_SERIAL_MPC52xx_CONSOLE) \
52 || defined(CONFIG_SERIAL_MPSC_CONSOLE)) \
53 && !defined(CONFIG_GEMINI)
54 #define INTERACTIVE_CONSOLE 1
60 char cmd_preset[] = CMDLINE;
62 char *cmd_line = cmd_buf;
63 int keyb_present = HAS_KEYB;
66 unsigned long com_port;
67 unsigned long initrd_size = 0;
69 /* The linker tells us various locations in the image */
70 extern char __image_begin, __image_end;
71 extern char __ramdisk_begin, __ramdisk_end;
73 /* Original location */
74 extern unsigned long start;
76 extern int CRT_tstc(void);
77 extern unsigned long serial_init(int chan, void *ignored);
78 extern void serial_close(unsigned long com_port);
79 extern void gunzip(void *, int, unsigned char *, int *);
80 extern void serial_fixups(void);
82 /* Allow get_mem_size to be hooked into. This is the default. */
83 unsigned long __attribute__ ((weak))
89 #if defined(CONFIG_40x)
90 #define PPC4xx_EMAC0_MR0 EMAC0_BASE
93 #if defined(CONFIG_44x) && defined(PPC44x_EMAC0_MR0)
94 #define PPC4xx_EMAC0_MR0 PPC44x_EMAC0_MR0
98 decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
100 #ifdef INTERACTIVE_CONSOLE
105 struct bi_record *rec;
106 unsigned long initrd_loc = 0, TotalMemory = 0;
108 #if defined(CONFIG_SERIAL_8250_CONSOLE) || defined(CONFIG_SERIAL_MPSC_CONSOLE)
109 com_port = serial_init(0, NULL);
112 #if defined(PPC4xx_EMAC0_MR0)
114 mtdcr(DCRN_MALCR(DCRN_MAL_BASE), MALCR_MMSR);
116 while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE)) & MALCR_MMSR) {};
118 *(volatile unsigned long *)PPC4xx_EMAC0_MR0 = 0x20000000;
119 __asm__ __volatile__("eieio");
123 * Call get_mem_size(), which is memory controller dependent,
124 * and we must have the correct file linked in here.
126 TotalMemory = get_mem_size();
128 /* assume the chunk below 8M is free */
129 end_avail = (char *)0x00800000;
132 * Reveal where we were loaded at and where we
135 puts("loaded at: "); puthex(load_addr);
136 puts(" "); puthex((unsigned long)(load_addr + (4*num_words)));
138 if ( (unsigned long)load_addr != (unsigned long)&start )
140 puts("relocated to: "); puthex((unsigned long)&start);
142 puthex((unsigned long)((unsigned long)&start + (4*num_words)));
147 * We link ourself to 0x00800000. When we run, we relocate
148 * ourselves there. So we just need __image_begin for the
151 zimage_start = (char *)(unsigned long)(&__image_begin);
152 zimage_size = (unsigned long)(&__image_end) -
153 (unsigned long)(&__image_begin);
155 initrd_size = (unsigned long)(&__ramdisk_end) -
156 (unsigned long)(&__ramdisk_begin);
159 * The zImage and initrd will be between start and _end, so they've
160 * already been moved once. We're good to go now. -- Tom
162 avail_ram = (char *)PAGE_ALIGN((unsigned long)_end);
163 puts("zimage at: "); puthex((unsigned long)zimage_start);
164 puts(" "); puthex((unsigned long)(zimage_size+zimage_start));
169 puthex((unsigned long)(&__ramdisk_begin));
170 puts(" "); puthex((unsigned long)(&__ramdisk_end));puts("\n");
173 #ifndef CONFIG_40x /* don't overwrite the 40x image located at 0x00400000! */
174 avail_ram = (char *)0x00400000;
176 end_avail = (char *)0x00800000;
177 puts("avail ram: "); puthex((unsigned long)avail_ram); puts(" ");
178 puthex((unsigned long)end_avail); puts("\n");
181 CRT_tstc(); /* Forces keyboard to be initialized */
184 * If cmd_line is empty and cmd_preset is not, copy cmd_preset
185 * to cmd_line. This way we can override cmd_preset with the
186 * command line from Smon.
189 if ( (cmd_line[0] == '\0') && (cmd_preset[0] != '\0'))
190 memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
193 /* Display standard Linux/PPC boot prompt for kernel args */
194 puts("\nLinux/PPC load: ");
196 memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
197 while ( *cp ) putc(*cp++);
199 #ifdef INTERACTIVE_CONSOLE
201 * If they have a console, allow them to edit the command line.
202 * Otherwise, don't bother wasting the five seconds.
204 while (timer++ < 5*1000) {
206 while ((ch = getc()) != '\n' && ch != '\r') {
207 /* Test for backspace/delete */
208 if (ch == '\b' || ch == '\177') {
209 if (cp != cmd_line) {
213 /* Test for ^x/^u (and wipe the line) */
214 } else if (ch == '\030' || ch == '\025') {
215 while (cp != cmd_line) {
224 break; /* Exit 'timer' loop */
226 udelay(1000); /* 1 msec */
232 puts("Uncompressing Linux...");
233 gunzip(NULL, 0x400000, zimage_start, &zimage_size);
236 /* get the bi_rec address */
237 rec = bootinfo_addr(zimage_size);
239 /* We need to make sure that the initrd and bi_recs do not
242 unsigned long rec_loc = (unsigned long) rec;
243 initrd_loc = (unsigned long)(&__ramdisk_begin);
244 /* If the bi_recs are in the middle of the current
245 * initrd, move the initrd to the next MB
247 if ((rec_loc > initrd_loc) &&
248 ((initrd_loc + initrd_size) > rec_loc)) {
249 initrd_loc = _ALIGN((unsigned long)(zimage_size)
250 + (2 << 20) - 1, (2 << 20));
251 memmove((void *)initrd_loc, &__ramdisk_begin,
253 puts("initrd moved: "); puthex(initrd_loc);
254 puts(" "); puthex(initrd_loc + initrd_size);
261 bootinfo_append(BI_MEMSIZE, sizeof(int), (void*)&TotalMemory);
263 bootinfo_append(BI_CMD_LINE, strlen(cmd_line)+1, (void*)cmd_line);
265 /* add a bi_rec for the initrd if it exists */
267 unsigned long initrd[2];
269 initrd[0] = initrd_loc;
270 initrd[1] = initrd_size;
272 bootinfo_append(BI_INITRD, sizeof(initrd), &initrd);
274 puts("Now booting the kernel\n");
275 serial_close(com_port);
280 void __attribute__ ((weak))
285 /* Allow decompress_kernel to be hooked into. This is the default. */
286 void * __attribute__ ((weak))
287 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
288 void *ign1, void *ign2)
291 return decompress_kernel(load_addr, num_words, cksum);