2 * arch/ppc/simple/misc.c
4 * Misc. bootloader code for many machines. This assumes you have are using
5 * a 6xx/7xx/74xx CPU in your machine. This assumes the chunk of memory
6 * below 8MB is free. Finally, it assumes you have a NS16550-style uart for
7 * your serial console. If a machine meets these requirements, it can quite
8 * likely use this code during boot.
10 * Author: Matt Porter <mporter@mvista.com>
11 * Derived from arch/ppc/boot/prep/misc.c
13 * 2001 (c) MontaVista, Software, Inc. This file is licensed under
14 * the terms of the GNU General Public License version 2. This program
15 * is licensed "as is" without any warranty of any kind, whether express
19 #include <linux/types.h>
20 #include <linux/config.h>
21 #include <linux/string.h>
25 #include <asm/bootinfo.h>
27 #include <asm/ibm4xx.h>
35 #define CMDLINE CONFIG_CMDLINE
40 /* Keyboard (and VGA console)? */
41 #ifdef CONFIG_VGA_CONSOLE
47 /* Will / Can the user give input?
48 * Val Henson has requested that Gemini doesn't wait for the
49 * user to edit the cmdline or not.
51 #if (defined(CONFIG_SERIAL_8250_CONSOLE) \
52 || defined(CONFIG_VGA_CONSOLE) \
53 || defined(CONFIG_SERIAL_MPC52xx_CONSOLE)) \
54 && !defined(CONFIG_GEMINI)
55 #define INTERACTIVE_CONSOLE 1
61 char cmd_preset[] = CMDLINE;
63 char *cmd_line = cmd_buf;
64 int keyb_present = HAS_KEYB;
67 unsigned long com_port;
68 unsigned long initrd_size = 0;
70 /* The linker tells us various locations in the image */
71 extern char __image_begin, __image_end;
72 extern char __ramdisk_begin, __ramdisk_end;
74 /* Original location */
75 extern unsigned long start;
77 extern int CRT_tstc(void);
78 extern unsigned long serial_init(int chan, void *ignored);
79 extern void serial_close(unsigned long com_port);
80 extern void gunzip(void *, int, unsigned char *, int *);
81 extern void serial_fixups(void);
83 /* Allow get_mem_size to be hooked into. This is the default. */
84 unsigned long __attribute__ ((weak))
91 decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
93 #ifdef INTERACTIVE_CONSOLE
98 struct bi_record *rec;
99 unsigned long initrd_loc = 0, TotalMemory = 0;
101 #ifdef CONFIG_SERIAL_8250_CONSOLE
102 com_port = serial_init(0, NULL);
107 mtdcr(DCRN_MALCR(DCRN_MAL_BASE), MALCR_MMSR);
109 while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE)) & MALCR_MMSR) {};
111 *(volatile unsigned long *)PPC44x_EMAC0_MR0 = 0x20000000;
112 __asm__ __volatile__("eieio");
116 * Call get_mem_size(), which is memory controller dependent,
117 * and we must have the correct file linked in here.
119 TotalMemory = get_mem_size();
121 /* assume the chunk below 8M is free */
122 end_avail = (char *)0x00800000;
125 * Reveal where we were loaded at and where we
128 puts("loaded at: "); puthex(load_addr);
129 puts(" "); puthex((unsigned long)(load_addr + (4*num_words)));
131 if ( (unsigned long)load_addr != (unsigned long)&start )
133 puts("relocated to: "); puthex((unsigned long)&start);
135 puthex((unsigned long)((unsigned long)&start + (4*num_words)));
140 * We link ourself to 0x00800000. When we run, we relocate
141 * ourselves there. So we just need __image_begin for the
144 zimage_start = (char *)(unsigned long)(&__image_begin);
145 zimage_size = (unsigned long)(&__image_end) -
146 (unsigned long)(&__image_begin);
148 initrd_size = (unsigned long)(&__ramdisk_end) -
149 (unsigned long)(&__ramdisk_begin);
152 * The zImage and initrd will be between start and _end, so they've
153 * already been moved once. We're good to go now. -- Tom
155 avail_ram = (char *)PAGE_ALIGN((unsigned long)_end);
156 puts("zimage at: "); puthex((unsigned long)zimage_start);
157 puts(" "); puthex((unsigned long)(zimage_size+zimage_start));
162 puthex((unsigned long)(&__ramdisk_begin));
163 puts(" "); puthex((unsigned long)(&__ramdisk_end));puts("\n");
166 avail_ram = (char *)0x00400000;
167 end_avail = (char *)0x00800000;
168 puts("avail ram: "); puthex((unsigned long)avail_ram); puts(" ");
169 puthex((unsigned long)end_avail); puts("\n");
172 CRT_tstc(); /* Forces keyboard to be initialized */
175 * If cmd_line is empty and cmd_preset is not, copy cmd_preset
176 * to cmd_line. This way we can override cmd_preset with the
177 * command line from Smon.
180 if ( (cmd_line[0] == '\0') && (cmd_preset[0] != '\0'))
181 memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
184 /* Display standard Linux/PPC boot prompt for kernel args */
185 puts("\nLinux/PPC load: ");
187 memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
188 while ( *cp ) putc(*cp++);
190 #ifdef INTERACTIVE_CONSOLE
192 * If they have a console, allow them to edit the command line.
193 * Otherwise, don't bother wasting the five seconds.
195 while (timer++ < 5*1000) {
197 while ((ch = getc()) != '\n' && ch != '\r') {
198 /* Test for backspace/delete */
199 if (ch == '\b' || ch == '\177') {
200 if (cp != cmd_line) {
204 /* Test for ^x/^u (and wipe the line) */
205 } else if (ch == '\030' || ch == '\025') {
206 while (cp != cmd_line) {
215 break; /* Exit 'timer' loop */
217 udelay(1000); /* 1 msec */
223 puts("Uncompressing Linux...");
224 gunzip(0x0, 0x400000, zimage_start, &zimage_size);
227 /* get the bi_rec address */
228 rec = bootinfo_addr(zimage_size);
230 /* We need to make sure that the initrd and bi_recs do not
233 unsigned long rec_loc = (unsigned long) rec;
234 initrd_loc = (unsigned long)(&__ramdisk_begin);
235 /* If the bi_recs are in the middle of the current
236 * initrd, move the initrd to the next MB
238 if ((rec_loc > initrd_loc) &&
239 ((initrd_loc + initrd_size) > rec_loc)) {
240 initrd_loc = _ALIGN((unsigned long)(zimage_size)
241 + (2 << 20) - 1, (2 << 20));
242 memmove((void *)initrd_loc, &__ramdisk_begin,
244 puts("initrd moved: "); puthex(initrd_loc);
245 puts(" "); puthex(initrd_loc + initrd_size);
252 bootinfo_append(BI_MEMSIZE, sizeof(int), (void*)&TotalMemory);
254 bootinfo_append(BI_CMD_LINE, strlen(cmd_line)+1, (void*)cmd_line);
256 /* add a bi_rec for the initrd if it exists */
258 unsigned long initrd[2];
260 initrd[0] = initrd_loc;
261 initrd[1] = initrd_size;
263 bootinfo_append(BI_INITRD, sizeof(initrd), &initrd);
265 puts("Now booting the kernel\n");
266 serial_close(com_port);
271 void __attribute__ ((weak))
276 /* Allow decompress_kernel to be hooked into. This is the default. */
277 void * __attribute__ ((weak))
278 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
279 void *ign1, void *ign2)
282 return decompress_kernel(load_addr, num_words, cksum);