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/arch/ppc/boot/simple/misc.c

https://bitbucket.org/evzijst/gittest
C | 284 lines | 180 code | 37 blank | 67 comment | 40 complexity | 9d8a2e1fca4e0159cb60896cbf67a5b8 MD5 | raw file
  1/*
  2 * arch/ppc/simple/misc.c
  3 *
  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.
  9 *
 10 * Author: Matt Porter <mporter@mvista.com>
 11 * Derived from arch/ppc/boot/prep/misc.c
 12 *
 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
 16 * or implied.
 17 */
 18
 19#include <linux/types.h>
 20#include <linux/config.h>
 21#include <linux/string.h>
 22
 23#include <asm/page.h>
 24#include <asm/mmu.h>
 25#include <asm/bootinfo.h>
 26#ifdef CONFIG_44x
 27#include <asm/ibm4xx.h>
 28#endif
 29#include <asm/reg.h>
 30
 31#include "nonstdio.h"
 32
 33/* Default cmdline */
 34#ifdef CONFIG_CMDLINE
 35#define CMDLINE CONFIG_CMDLINE
 36#else
 37#define CMDLINE ""
 38#endif
 39
 40/* Keyboard (and VGA console)? */
 41#ifdef CONFIG_VGA_CONSOLE
 42#define HAS_KEYB 1
 43#else
 44#define HAS_KEYB 0
 45#endif
 46
 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.
 50 */
 51#if (defined(CONFIG_SERIAL_8250_CONSOLE) \
 52	|| defined(CONFIG_VGA_CONSOLE) \
 53	|| defined(CONFIG_SERIAL_MPC52xx_CONSOLE) \
 54	|| defined(CONFIG_SERIAL_MPSC_CONSOLE)) \
 55	&& !defined(CONFIG_GEMINI)
 56#define INTERACTIVE_CONSOLE	1
 57#endif
 58
 59char *avail_ram;
 60char *end_avail;
 61char *zimage_start;
 62char cmd_preset[] = CMDLINE;
 63char cmd_buf[256];
 64char *cmd_line = cmd_buf;
 65int keyb_present = HAS_KEYB;
 66int zimage_size;
 67
 68unsigned long com_port;
 69unsigned long initrd_size = 0;
 70
 71/* The linker tells us various locations in the image */
 72extern char __image_begin, __image_end;
 73extern char __ramdisk_begin, __ramdisk_end;
 74extern char _end[];
 75/* Original location */
 76extern unsigned long start;
 77
 78extern int CRT_tstc(void);
 79extern unsigned long serial_init(int chan, void *ignored);
 80extern void serial_close(unsigned long com_port);
 81extern void gunzip(void *, int, unsigned char *, int *);
 82extern void serial_fixups(void);
 83
 84/* Allow get_mem_size to be hooked into.  This is the default. */
 85unsigned long __attribute__ ((weak))
 86get_mem_size(void)
 87{
 88	return 0;
 89}
 90
 91struct bi_record *
 92decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
 93{
 94#ifdef INTERACTIVE_CONSOLE
 95	int timer = 0;
 96	char ch;
 97#endif
 98	char *cp;
 99	struct bi_record *rec;
100	unsigned long initrd_loc = 0, TotalMemory = 0;
101
102#if defined(CONFIG_SERIAL_8250_CONSOLE) || defined(CONFIG_SERIAL_MPSC_CONSOLE)
103	com_port = serial_init(0, NULL);
104#endif
105
106#if defined(CONFIG_44x) && defined(PPC44x_EMAC0_MR0)
107	/* Reset MAL */
108	mtdcr(DCRN_MALCR(DCRN_MAL_BASE), MALCR_MMSR);
109	/* Wait for reset */
110	while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE)) & MALCR_MMSR) {};
111	/* Reset EMAC */
112	*(volatile unsigned long *)PPC44x_EMAC0_MR0 = 0x20000000;
113	__asm__ __volatile__("eieio");
114#endif
115
116	/*
117	 * Call get_mem_size(), which is memory controller dependent,
118	 * and we must have the correct file linked in here.
119	 */
120	TotalMemory = get_mem_size();
121
122	/* assume the chunk below 8M is free */
123	end_avail = (char *)0x00800000;
124
125	/*
126	 * Reveal where we were loaded at and where we
127	 * were relocated to.
128	 */
129	puts("loaded at:     "); puthex(load_addr);
130	puts(" "); puthex((unsigned long)(load_addr + (4*num_words)));
131	puts("\n");
132	if ( (unsigned long)load_addr != (unsigned long)&start )
133	{
134		puts("relocated to:  "); puthex((unsigned long)&start);
135		puts(" ");
136		puthex((unsigned long)((unsigned long)&start + (4*num_words)));
137		puts("\n");
138	}
139
140	/*
141	 * We link ourself to 0x00800000.  When we run, we relocate
142	 * ourselves there.  So we just need __image_begin for the
143	 * start. -- Tom
144	 */
145	zimage_start = (char *)(unsigned long)(&__image_begin);
146	zimage_size = (unsigned long)(&__image_end) -
147			(unsigned long)(&__image_begin);
148
149	initrd_size = (unsigned long)(&__ramdisk_end) -
150		(unsigned long)(&__ramdisk_begin);
151
152	/*
153	 * The zImage and initrd will be between start and _end, so they've
154	 * already been moved once.  We're good to go now. -- Tom
155	 */
156	avail_ram = (char *)PAGE_ALIGN((unsigned long)_end);
157	puts("zimage at:     "); puthex((unsigned long)zimage_start);
158	puts(" "); puthex((unsigned long)(zimage_size+zimage_start));
159	puts("\n");
160
161	if ( initrd_size ) {
162		puts("initrd at:     ");
163		puthex((unsigned long)(&__ramdisk_begin));
164		puts(" "); puthex((unsigned long)(&__ramdisk_end));puts("\n");
165	}
166
167	avail_ram = (char *)0x00400000;
168	end_avail = (char *)0x00800000;
169	puts("avail ram:     "); puthex((unsigned long)avail_ram); puts(" ");
170	puthex((unsigned long)end_avail); puts("\n");
171
172	if (keyb_present)
173		CRT_tstc();  /* Forces keyboard to be initialized */
174#ifdef CONFIG_GEMINI
175	/*
176	 * If cmd_line is empty and cmd_preset is not, copy cmd_preset
177	 * to cmd_line.  This way we can override cmd_preset with the
178	 * command line from Smon.
179	 */
180
181	if ( (cmd_line[0] == '\0') && (cmd_preset[0] != '\0'))
182		memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
183#endif
184
185	/* Display standard Linux/PPC boot prompt for kernel args */
186	puts("\nLinux/PPC load: ");
187	cp = cmd_line;
188	memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
189	while ( *cp ) putc(*cp++);
190
191#ifdef INTERACTIVE_CONSOLE
192	/*
193	 * If they have a console, allow them to edit the command line.
194	 * Otherwise, don't bother wasting the five seconds.
195	 */
196	while (timer++ < 5*1000) {
197		if (tstc()) {
198			while ((ch = getc()) != '\n' && ch != '\r') {
199				/* Test for backspace/delete */
200				if (ch == '\b' || ch == '\177') {
201					if (cp != cmd_line) {
202						cp--;
203						puts("\b \b");
204					}
205				/* Test for ^x/^u (and wipe the line) */
206				} else if (ch == '\030' || ch == '\025') {
207					while (cp != cmd_line) {
208						cp--;
209						puts("\b \b");
210					}
211				} else {
212					*cp++ = ch;
213					putc(ch);
214				}
215			}
216			break;  /* Exit 'timer' loop */
217		}
218		udelay(1000);  /* 1 msec */
219	}
220	*cp = 0;
221#endif
222	puts("\n");
223
224	puts("Uncompressing Linux...");
225	gunzip(0x0, 0x400000, zimage_start, &zimage_size);
226	puts("done.\n");
227
228	/* get the bi_rec address */
229	rec = bootinfo_addr(zimage_size);
230
231	/* We need to make sure that the initrd and bi_recs do not
232	 * overlap. */
233	if ( initrd_size ) {
234		unsigned long rec_loc = (unsigned long) rec;
235		initrd_loc = (unsigned long)(&__ramdisk_begin);
236		/* If the bi_recs are in the middle of the current
237		 * initrd, move the initrd to the next MB
238		 * boundary. */
239		if ((rec_loc > initrd_loc) &&
240				((initrd_loc + initrd_size) > rec_loc)) {
241			initrd_loc = _ALIGN((unsigned long)(zimage_size)
242					+ (2 << 20) - 1, (2 << 20));
243		 	memmove((void *)initrd_loc, &__ramdisk_begin,
244				 initrd_size);
245	         	puts("initrd moved:  "); puthex(initrd_loc);
246		 	puts(" "); puthex(initrd_loc + initrd_size);
247		 	puts("\n");
248		}
249	}
250
251	bootinfo_init(rec);
252	if ( TotalMemory )
253		bootinfo_append(BI_MEMSIZE, sizeof(int), (void*)&TotalMemory);
254
255	bootinfo_append(BI_CMD_LINE, strlen(cmd_line)+1, (void*)cmd_line);
256
257	/* add a bi_rec for the initrd if it exists */
258	if (initrd_size) {
259		unsigned long initrd[2];
260
261		initrd[0] = initrd_loc;
262		initrd[1] = initrd_size;
263
264		bootinfo_append(BI_INITRD, sizeof(initrd), &initrd);
265	}
266	puts("Now booting the kernel\n");
267	serial_close(com_port);
268
269	return rec;
270}
271
272void __attribute__ ((weak))
273board_isa_init(void)
274{
275}
276
277/* Allow decompress_kernel to be hooked into.  This is the default. */
278void * __attribute__ ((weak))
279load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
280		void *ign1, void *ign2)
281{
282		board_isa_init();
283		return decompress_kernel(load_addr, num_words, cksum);
284}