arch/ppc/boot/simple/misc.c

   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_4xx
  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
  59 char *avail_ram;
  60 char *end_avail;
  61 char *zimage_start;
  62 char cmd_preset[] = CMDLINE;
  63 char cmd_buf[256];
  64 char *cmd_line = cmd_buf;
  65 int keyb_present = HAS_KEYB;
  66 int zimage_size;
  67
  68 unsigned long com_port;
  69 unsigned long initrd_size = 0;
  70
  71 /* The linker tells us various locations in the image */
  72 extern char __image_begin, __image_end;
  73 extern char __ramdisk_begin, __ramdisk_end;
  74 extern char _end[];
  75 /* Original location */
  76 extern unsigned long start;
  77
  78 extern int CRT_tstc(void);
  79 extern unsigned long serial_init(int chan, void *ignored);
  80 extern void serial_close(unsigned long com_port);
  81 extern void gunzip(void *, int, unsigned char *, int *);
  82 extern void serial_fixups(void);
  83
  84 /* Allow get_mem_size to be hooked into.  This is the default. */
  85 unsigned long __attribute__ ((weak))
  86 get_mem_size(void)
  87 {
  88         return 0;
  89 }
  90
  91 #if defined(CONFIG_40x)
  92 #define PPC4xx_EMAC0_MR0        EMAC0_BASE
  93 #endif
  94
  95 #if defined(CONFIG_44x) && defined(PPC44x_EMAC0_MR0)
  96 #define PPC4xx_EMAC0_MR0        PPC44x_EMAC0_MR0
  97 #endif
  98
  99 struct bi_record *
 100 decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
 101 {
 102 #ifdef INTERACTIVE_CONSOLE
 103         int timer = 0;
 104         char ch;
 105 #endif
 106         char *cp;
 107         struct bi_record *rec;
 108         unsigned long initrd_loc = 0, TotalMemory = 0;
 109
 110 #if defined(CONFIG_SERIAL_8250_CONSOLE) || defined(CONFIG_SERIAL_MPSC_CONSOLE)
 111         com_port = serial_init(0, NULL);
 112 #endif
 113
 114 #if defined(PPC4xx_EMAC0_MR0)
 115         /* Reset MAL */
 116         mtdcr(DCRN_MALCR(DCRN_MAL_BASE), MALCR_MMSR);
 117         /* Wait for reset */
 118         while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE)) & MALCR_MMSR) {};
 119         /* Reset EMAC */
 120         *(volatile unsigned long *)PPC4xx_EMAC0_MR0 = 0x20000000;
 121         __asm__ __volatile__("eieio");
 122 #endif
 123
 124         /*
 125          * Call get_mem_size(), which is memory controller dependent,
 126          * and we must have the correct file linked in here.
 127          */
 128         TotalMemory = get_mem_size();
 129
 130         /* assume the chunk below 8M is free */
 131         end_avail = (char *)0x00800000;
 132
 133         /*
 134          * Reveal where we were loaded at and where we
 135          * were relocated to.
 136          */
 137         puts("loaded at:     "); puthex(load_addr);
 138         puts(" "); puthex((unsigned long)(load_addr + (4*num_words)));
 139         puts("\n");
 140         if ( (unsigned long)load_addr != (unsigned long)&start )
 141         {
 142                 puts("relocated to:  "); puthex((unsigned long)&start);
 143                 puts(" ");
 144                 puthex((unsigned long)((unsigned long)&start + (4*num_words)));
 145                 puts("\n");
 146         }
 147
 148         /*
 149          * We link ourself to 0x00800000.  When we run, we relocate
 150          * ourselves there.  So we just need __image_begin for the
 151          * start. -- Tom
 152          */
 153         zimage_start = (char *)(unsigned long)(&__image_begin);
 154         zimage_size = (unsigned long)(&__image_end) -
 155                         (unsigned long)(&__image_begin);
 156
 157         initrd_size = (unsigned long)(&__ramdisk_end) -
 158                 (unsigned long)(&__ramdisk_begin);
 159
 160         /*
 161          * The zImage and initrd will be between start and _end, so they've
 162          * already been moved once.  We're good to go now. -- Tom
 163          */
 164         avail_ram = (char *)PAGE_ALIGN((unsigned long)_end);
 165         puts("zimage at:     "); puthex((unsigned long)zimage_start);
 166         puts(" "); puthex((unsigned long)(zimage_size+zimage_start));
 167         puts("\n");
 168
 169         if ( initrd_size ) {
 170                 puts("initrd at:     ");
 171                 puthex((unsigned long)(&__ramdisk_begin));
 172                 puts(" "); puthex((unsigned long)(&__ramdisk_end));puts("\n");
 173         }
 174
 175 #ifndef CONFIG_40x /* don't overwrite the 40x image located at 0x00400000! */
 176         avail_ram = (char *)0x00400000;
 177 #endif
 178         end_avail = (char *)0x00800000;
 179         puts("avail ram:     "); puthex((unsigned long)avail_ram); puts(" ");
 180         puthex((unsigned long)end_avail); puts("\n");
 181
 182         if (keyb_present)
 183                 CRT_tstc();  /* Forces keyboard to be initialized */
 184 #ifdef CONFIG_GEMINI
 185         /*
 186          * If cmd_line is empty and cmd_preset is not, copy cmd_preset
 187          * to cmd_line.  This way we can override cmd_preset with the
 188          * command line from Smon.
 189          */
 190
 191         if ( (cmd_line[0] == '\0') && (cmd_preset[0] != '\0'))
 192                 memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
 193 #endif
 194
 195         /* Display standard Linux/PPC boot prompt for kernel args */
 196         puts("\nLinux/PPC load: ");
 197         cp = cmd_line;
 198         memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
 199         while ( *cp ) putc(*cp++);
 200
 201 #ifdef INTERACTIVE_CONSOLE
 202         /*
 203          * If they have a console, allow them to edit the command line.
 204          * Otherwise, don't bother wasting the five seconds.
 205          */
 206         while (timer++ < 5*1000) {
 207                 if (tstc()) {
 208                         while ((ch = getc()) != '\n' && ch != '\r') {
 209                                 /* Test for backspace/delete */
 210                                 if (ch == '\b' || ch == '\177') {
 211                                         if (cp != cmd_line) {
 212                                                 cp--;
 213                                                 puts("\b \b");
 214                                         }
 215                                 /* Test for ^x/^u (and wipe the line) */
 216                                 } else if (ch == '\030' || ch == '\025') {
 217                                         while (cp != cmd_line) {
 218                                                 cp--;
 219                                                 puts("\b \b");
 220                                         }
 221                                 } else {
 222                                         *cp++ = ch;
 223                                         putc(ch);
 224                                 }
 225                         }
 226                         break;  /* Exit 'timer' loop */
 227                 }
 228                 udelay(1000);  /* 1 msec */
 229         }
 230         *cp = 0;
 231 #endif
 232         puts("\n");
 233
 234         puts("Uncompressing Linux...");
 235         gunzip(NULL, 0x400000, zimage_start, &zimage_size);
 236         puts("done.\n");
 237
 238         /* get the bi_rec address */
 239         rec = bootinfo_addr(zimage_size);
 240
 241         /* We need to make sure that the initrd and bi_recs do not
 242          * overlap. */
 243         if ( initrd_size ) {
 244                 unsigned long rec_loc = (unsigned long) rec;
 245                 initrd_loc = (unsigned long)(&__ramdisk_begin);
 246                 /* If the bi_recs are in the middle of the current
 247                  * initrd, move the initrd to the next MB
 248                  * boundary. */
 249                 if ((rec_loc > initrd_loc) &&
 250                                 ((initrd_loc + initrd_size) > rec_loc)) {
 251                         initrd_loc = _ALIGN((unsigned long)(zimage_size)
 252                                         + (2 << 20) - 1, (2 << 20));
 253                         memmove((void *)initrd_loc, &__ramdisk_begin,
 254                                  initrd_size);
 255                         puts("initrd moved:  "); puthex(initrd_loc);
 256                         puts(" "); puthex(initrd_loc + initrd_size);
 257                         puts("\n");
 258                 }
 259         }
 260
 261         bootinfo_init(rec);
 262         if ( TotalMemory )
 263                 bootinfo_append(BI_MEMSIZE, sizeof(int), (void*)&TotalMemory);
 264
 265         bootinfo_append(BI_CMD_LINE, strlen(cmd_line)+1, (void*)cmd_line);
 266
 267         /* add a bi_rec for the initrd if it exists */
 268         if (initrd_size) {
 269                 unsigned long initrd[2];
 270
 271                 initrd[0] = initrd_loc;
 272                 initrd[1] = initrd_size;
 273
 274                 bootinfo_append(BI_INITRD, sizeof(initrd), &initrd);
 275         }
 276         puts("Now booting the kernel\n");
 277         serial_close(com_port);
 278
 279         return rec;
 280 }
 281
 282 void __attribute__ ((weak))
 283 board_isa_init(void)
 284 {
 285 }
 286
 287 /* Allow decompress_kernel to be hooked into.  This is the default. */
 288 void * __attribute__ ((weak))
 289 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
 290                 void *ign1, void *ign2)
 291 {
 292                 board_isa_init();
 293                 return decompress_kernel(load_addr, num_words, cksum);
 294 }