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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/ppc/boot/simple/misc.c
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?
45 * Val Henson has requested that Gemini doesn't wait for the
46 * user to edit the cmdline or not.
48 #if (defined(CONFIG_SERIAL_8250_CONSOLE) \
49 || defined(CONFIG_VGA_CONSOLE) \
50 || defined(CONFIG_SERIAL_MPC52xx_CONSOLE) \
51 || defined(CONFIG_SERIAL_MPSC_CONSOLE)) \
52 && !defined(CONFIG_GEMINI)
53 #define INTERACTIVE_CONSOLE 1
59 char cmd_preset
[] = CMDLINE
;
61 char *cmd_line
= cmd_buf
;
62 int keyb_present
= HAS_KEYB
;
65 unsigned long com_port
;
66 unsigned long initrd_size
= 0;
68 /* The linker tells us various locations in the image */
69 extern char __image_begin
, __image_end
;
70 extern char __ramdisk_begin
, __ramdisk_end
;
72 /* Original location */
73 extern unsigned long start
;
75 extern int CRT_tstc(void);
76 extern unsigned long serial_init(int chan
, void *ignored
);
77 extern void serial_close(unsigned long com_port
);
78 extern void gunzip(void *, int, unsigned char *, int *);
79 extern void serial_fixups(void);
81 /* Allow get_mem_size to be hooked into. This is the default. */
82 unsigned long __attribute__ ((weak
))
88 #if defined(CONFIG_40x)
89 #define PPC4xx_EMAC0_MR0 EMAC0_BASE
92 #if defined(CONFIG_44x) && defined(PPC44x_EMAC0_MR0)
93 #define PPC4xx_EMAC0_MR0 PPC44x_EMAC0_MR0
97 decompress_kernel(unsigned long load_addr
, int num_words
, unsigned long cksum
)
99 #ifdef INTERACTIVE_CONSOLE
104 struct bi_record
*rec
;
105 unsigned long initrd_loc
= 0, TotalMemory
= 0;
107 #if defined(CONFIG_SERIAL_8250_CONSOLE) || defined(CONFIG_SERIAL_MPSC_CONSOLE)
108 com_port
= serial_init(0, NULL
);
111 #if defined(PPC4xx_EMAC0_MR0)
113 mtdcr(DCRN_MALCR(DCRN_MAL_BASE
), MALCR_MMSR
);
115 while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE
)) & MALCR_MMSR
) {};
117 *(volatile unsigned long *)PPC4xx_EMAC0_MR0
= 0x20000000;
118 __asm__
__volatile__("eieio");
122 * Call get_mem_size(), which is memory controller dependent,
123 * and we must have the correct file linked in here.
125 TotalMemory
= get_mem_size();
127 /* assume the chunk below 8M is free */
128 end_avail
= (char *)0x00800000;
131 * Reveal where we were loaded at and where we
134 puts("loaded at: "); puthex(load_addr
);
135 puts(" "); puthex((unsigned long)(load_addr
+ (4*num_words
)));
137 if ( (unsigned long)load_addr
!= (unsigned long)&start
)
139 puts("relocated to: "); puthex((unsigned long)&start
);
141 puthex((unsigned long)((unsigned long)&start
+ (4*num_words
)));
146 * We link ourself to 0x00800000. When we run, we relocate
147 * ourselves there. So we just need __image_begin for the
150 zimage_start
= (char *)(unsigned long)(&__image_begin
);
151 zimage_size
= (unsigned long)(&__image_end
) -
152 (unsigned long)(&__image_begin
);
154 initrd_size
= (unsigned long)(&__ramdisk_end
) -
155 (unsigned long)(&__ramdisk_begin
);
158 * The zImage and initrd will be between start and _end, so they've
159 * already been moved once. We're good to go now. -- Tom
161 avail_ram
= (char *)PAGE_ALIGN((unsigned long)_end
);
162 puts("zimage at: "); puthex((unsigned long)zimage_start
);
163 puts(" "); puthex((unsigned long)(zimage_size
+zimage_start
));
168 puthex((unsigned long)(&__ramdisk_begin
));
169 puts(" "); puthex((unsigned long)(&__ramdisk_end
));puts("\n");
172 #ifndef CONFIG_40x /* don't overwrite the 40x image located at 0x00400000! */
173 avail_ram
= (char *)0x00400000;
175 end_avail
= (char *)0x00800000;
176 puts("avail ram: "); puthex((unsigned long)avail_ram
); puts(" ");
177 puthex((unsigned long)end_avail
); puts("\n");
180 CRT_tstc(); /* Forces keyboard to be initialized */
183 * If cmd_line is empty and cmd_preset is not, copy cmd_preset
184 * to cmd_line. This way we can override cmd_preset with the
185 * command line from Smon.
188 if ( (cmd_line
[0] == '\0') && (cmd_preset
[0] != '\0'))
189 memcpy (cmd_line
, cmd_preset
, sizeof(cmd_preset
));
192 /* Display standard Linux/PPC boot prompt for kernel args */
193 puts("\nLinux/PPC load: ");
195 memcpy (cmd_line
, cmd_preset
, sizeof(cmd_preset
));
196 while ( *cp
) putc(*cp
++);
198 #ifdef INTERACTIVE_CONSOLE
200 * If they have a console, allow them to edit the command line.
201 * Otherwise, don't bother wasting the five seconds.
203 while (timer
++ < 5*1000) {
205 while ((ch
= getc()) != '\n' && ch
!= '\r') {
206 /* Test for backspace/delete */
207 if (ch
== '\b' || ch
== '\177') {
208 if (cp
!= cmd_line
) {
212 /* Test for ^x/^u (and wipe the line) */
213 } else if (ch
== '\030' || ch
== '\025') {
214 while (cp
!= cmd_line
) {
223 break; /* Exit 'timer' loop */
225 udelay(1000); /* 1 msec */
231 puts("Uncompressing Linux...");
232 gunzip(NULL
, 0x400000, zimage_start
, &zimage_size
);
235 /* get the bi_rec address */
236 rec
= bootinfo_addr(zimage_size
);
238 /* We need to make sure that the initrd and bi_recs do not
241 unsigned long rec_loc
= (unsigned long) rec
;
242 initrd_loc
= (unsigned long)(&__ramdisk_begin
);
243 /* If the bi_recs are in the middle of the current
244 * initrd, move the initrd to the next MB
246 if ((rec_loc
> initrd_loc
) &&
247 ((initrd_loc
+ initrd_size
) > rec_loc
)) {
248 initrd_loc
= _ALIGN((unsigned long)(zimage_size
)
249 + (2 << 20) - 1, (2 << 20));
250 memmove((void *)initrd_loc
, &__ramdisk_begin
,
252 puts("initrd moved: "); puthex(initrd_loc
);
253 puts(" "); puthex(initrd_loc
+ initrd_size
);
260 bootinfo_append(BI_MEMSIZE
, sizeof(int), (void*)&TotalMemory
);
262 bootinfo_append(BI_CMD_LINE
, strlen(cmd_line
)+1, (void*)cmd_line
);
264 /* add a bi_rec for the initrd if it exists */
266 unsigned long initrd
[2];
268 initrd
[0] = initrd_loc
;
269 initrd
[1] = initrd_size
;
271 bootinfo_append(BI_INITRD
, sizeof(initrd
), &initrd
);
273 puts("Now booting the kernel\n");
274 serial_close(com_port
);
279 void __attribute__ ((weak
))
284 /* Allow decompress_kernel to be hooked into. This is the default. */
285 void * __attribute__ ((weak
))
286 load_kernel(unsigned long load_addr
, int num_words
, unsigned long cksum
,
287 void *ign1
, void *ign2
)
290 return decompress_kernel(load_addr
, num_words
, cksum
);