arch/ppc/boot/simple/misc.c

   1 /*
   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.
   7  *
   8  * Author: Matt Porter <mporter@mvista.com>
   9  * Derived from arch/ppc/boot/prep/misc.c
  10  *
  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
  14  * or implied.
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/string.h>
  19
  20 #include <asm/page.h>
  21 #include <asm/mmu.h>
  22 #include <asm/bootinfo.h>
  23 #ifdef CONFIG_4xx
  24 #include <asm/ibm4xx.h>
  25 #endif
  26 #include <asm/reg.h>
  27
  28 #include "nonstdio.h"
  29
  30 /* Default cmdline */
  31 #ifdef CONFIG_CMDLINE
  32 #define CMDLINE CONFIG_CMDLINE
  33 #else
  34 #define CMDLINE ""
  35 #endif
  36
  37 /* Keyboard (and VGA console)? */
  38 #ifdef CONFIG_VGA_CONSOLE
  39 #define HAS_KEYB 1
  40 #else
  41 #define HAS_KEYB 0
  42 #endif
  43
  44 /* Will / Can the user give input?
  45  */
  46 #if (defined(CONFIG_SERIAL_8250_CONSOLE) \
  47         || defined(CONFIG_VGA_CONSOLE) \
  48         || defined(CONFIG_SERIAL_MPC52xx_CONSOLE) \
  49         || defined(CONFIG_SERIAL_MPSC_CONSOLE))
  50 #define INTERACTIVE_CONSOLE     1
  51 #endif
  52
  53 char *avail_ram;
  54 char *end_avail;
  55 char *zimage_start;
  56 char cmd_preset[] = CMDLINE;
  57 char cmd_buf[256];
  58 char *cmd_line = cmd_buf;
  59 int keyb_present = HAS_KEYB;
  60 int zimage_size;
  61
  62 unsigned long com_port;
  63 unsigned long initrd_size = 0;
  64
  65 /* The linker tells us various locations in the image */
  66 extern char __image_begin, __image_end;
  67 extern char __ramdisk_begin, __ramdisk_end;
  68 extern char _end[];
  69 /* Original location */
  70 extern unsigned long start;
  71
  72 extern int CRT_tstc(void);
  73 extern unsigned long serial_init(int chan, void *ignored);
  74 extern void serial_close(unsigned long com_port);
  75 extern void gunzip(void *, int, unsigned char *, int *);
  76 extern void serial_fixups(void);
  77
  78 /* Allow get_mem_size to be hooked into.  This is the default. */
  79 unsigned long __attribute__ ((weak))
  80 get_mem_size(void)
  81 {
  82         return 0;
  83 }
  84
  85 #if defined(CONFIG_40x)
  86 #define PPC4xx_EMAC0_MR0        EMAC0_BASE
  87 #endif
  88
  89 #if defined(CONFIG_44x) && defined(PPC44x_EMAC0_MR0)
  90 #define PPC4xx_EMAC0_MR0        PPC44x_EMAC0_MR0
  91 #endif
  92
  93 struct bi_record *
  94 decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
  95 {
  96 #ifdef INTERACTIVE_CONSOLE
  97         int timer = 0;
  98         char ch;
  99 #endif
 100         char *cp;
 101         struct bi_record *rec;
 102         unsigned long initrd_loc = 0, TotalMemory = 0;
 103
 104 #if defined(CONFIG_SERIAL_8250_CONSOLE) || defined(CONFIG_SERIAL_MPSC_CONSOLE)
 105         com_port = serial_init(0, NULL);
 106 #endif
 107
 108 #if defined(PPC4xx_EMAC0_MR0)
 109         /* Reset MAL */
 110         mtdcr(DCRN_MALCR(DCRN_MAL_BASE), MALCR_MMSR);
 111         /* Wait for reset */
 112         while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE)) & MALCR_MMSR) {};
 113         /* Reset EMAC */
 114         *(volatile unsigned long *)PPC4xx_EMAC0_MR0 = 0x20000000;
 115         __asm__ __volatile__("eieio");
 116 #endif
 117
 118         /*
 119          * Call get_mem_size(), which is memory controller dependent,
 120          * and we must have the correct file linked in here.
 121          */
 122         TotalMemory = get_mem_size();
 123
 124         /* assume the chunk below 8M is free */
 125         end_avail = (char *)0x00800000;
 126
 127         /*
 128          * Reveal where we were loaded at and where we
 129          * were relocated to.
 130          */
 131         puts("loaded at:     "); puthex(load_addr);
 132         puts(" "); puthex((unsigned long)(load_addr + (4*num_words)));
 133         puts("\n");
 134         if ( (unsigned long)load_addr != (unsigned long)&start )
 135         {
 136                 puts("relocated to:  "); puthex((unsigned long)&start);
 137                 puts(" ");
 138                 puthex((unsigned long)((unsigned long)&start + (4*num_words)));
 139                 puts("\n");
 140         }
 141
 142         /*
 143          * We link ourself to 0x00800000.  When we run, we relocate
 144          * ourselves there.  So we just need __image_begin for the
 145          * start. -- Tom
 146          */
 147         zimage_start = (char *)(unsigned long)(&__image_begin);
 148         zimage_size = (unsigned long)(&__image_end) -
 149                         (unsigned long)(&__image_begin);
 150
 151         initrd_size = (unsigned long)(&__ramdisk_end) -
 152                 (unsigned long)(&__ramdisk_begin);
 153
 154         /*
 155          * The zImage and initrd will be between start and _end, so they've
 156          * already been moved once.  We're good to go now. -- Tom
 157          */
 158         avail_ram = (char *)PAGE_ALIGN((unsigned long)_end);
 159         puts("zimage at:     "); puthex((unsigned long)zimage_start);
 160         puts(" "); puthex((unsigned long)(zimage_size+zimage_start));
 161         puts("\n");
 162
 163         if ( initrd_size ) {
 164                 puts("initrd at:     ");
 165                 puthex((unsigned long)(&__ramdisk_begin));
 166                 puts(" "); puthex((unsigned long)(&__ramdisk_end));puts("\n");
 167         }
 168
 169 #ifndef CONFIG_40x /* don't overwrite the 40x image located at 0x00400000! */
 170         avail_ram = (char *)0x00400000;
 171 #endif
 172         end_avail = (char *)0x00800000;
 173         puts("avail ram:     "); puthex((unsigned long)avail_ram); puts(" ");
 174         puthex((unsigned long)end_avail); puts("\n");
 175
 176         if (keyb_present)
 177                 CRT_tstc();  /* Forces keyboard to be initialized */
 178
 179         /* Display standard Linux/PPC boot prompt for kernel args */
 180         puts("\nLinux/PPC load: ");
 181         cp = cmd_line;
 182         memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
 183         while ( *cp ) putc(*cp++);
 184
 185 #ifdef INTERACTIVE_CONSOLE
 186         /*
 187          * If they have a console, allow them to edit the command line.
 188          * Otherwise, don't bother wasting the five seconds.
 189          */
 190         while (timer++ < 5*1000) {
 191                 if (tstc()) {
 192                         while ((ch = getc()) != '\n' && ch != '\r') {
 193                                 /* Test for backspace/delete */
 194                                 if (ch == '\b' || ch == '\177') {
 195                                         if (cp != cmd_line) {
 196                                                 cp--;
 197                                                 puts("\b \b");
 198                                         }
 199                                 /* Test for ^x/^u (and wipe the line) */
 200                                 } else if (ch == '\030' || ch == '\025') {
 201                                         while (cp != cmd_line) {
 202                                                 cp--;
 203                                                 puts("\b \b");
 204                                         }
 205                                 } else {
 206                                         *cp++ = ch;
 207                                         putc(ch);
 208                                 }
 209                         }
 210                         break;  /* Exit 'timer' loop */
 211                 }
 212                 udelay(1000);  /* 1 msec */
 213         }
 214         *cp = 0;
 215 #endif
 216         puts("\n");
 217
 218         puts("Uncompressing Linux...");
 219         gunzip(NULL, 0x400000, zimage_start, &zimage_size);
 220         puts("done.\n");
 221
 222         /* get the bi_rec address */
 223         rec = bootinfo_addr(zimage_size);
 224
 225         /* We need to make sure that the initrd and bi_recs do not
 226          * overlap. */
 227         if ( initrd_size ) {
 228                 unsigned long rec_loc = (unsigned long) rec;
 229                 initrd_loc = (unsigned long)(&__ramdisk_begin);
 230                 /* If the bi_recs are in the middle of the current
 231                  * initrd, move the initrd to the next MB
 232                  * boundary. */
 233                 if ((rec_loc > initrd_loc) &&
 234                                 ((initrd_loc + initrd_size) > rec_loc)) {
 235                         initrd_loc = _ALIGN((unsigned long)(zimage_size)
 236                                         + (2 << 20) - 1, (2 << 20));
 237                         memmove((void *)initrd_loc, &__ramdisk_begin,
 238                                  initrd_size);
 239                         puts("initrd moved:  "); puthex(initrd_loc);
 240                         puts(" "); puthex(initrd_loc + initrd_size);
 241                         puts("\n");
 242                 }
 243         }
 244
 245         bootinfo_init(rec);
 246         if ( TotalMemory )
 247                 bootinfo_append(BI_MEMSIZE, sizeof(int), (void*)&TotalMemory);
 248
 249         bootinfo_append(BI_CMD_LINE, strlen(cmd_line)+1, (void*)cmd_line);
 250
 251         /* add a bi_rec for the initrd if it exists */
 252         if (initrd_size) {
 253                 unsigned long initrd[2];
 254
 255                 initrd[0] = initrd_loc;
 256                 initrd[1] = initrd_size;
 257
 258                 bootinfo_append(BI_INITRD, sizeof(initrd), &initrd);
 259         }
 260         puts("Now booting the kernel\n");
 261         serial_close(com_port);
 262
 263         return rec;
 264 }
 265
 266 void __attribute__ ((weak))
 267 board_isa_init(void)
 268 {
 269 }
 270
 271 /* Allow decompress_kernel to be hooked into.  This is the default. */
 272 void * __attribute__ ((weak))
 273 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
 274                 void *ign1, void *ign2)
 275 {
 276                 board_isa_init();
 277                 return decompress_kernel(load_addr, num_words, cksum);
 278 }