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/config.h>
  19 #include <linux/string.h>
  20
  21 #include <asm/page.h>
  22 #include <asm/mmu.h>
  23 #include <asm/bootinfo.h>
  24 #ifdef CONFIG_4xx
  25 #include <asm/ibm4xx.h>
  26 #endif
  27 #include <asm/reg.h>
  28
  29 #include "nonstdio.h"
  30
  31 /* Default cmdline */
  32 #ifdef CONFIG_CMDLINE
  33 #define CMDLINE CONFIG_CMDLINE
  34 #else
  35 #define CMDLINE ""
  36 #endif
  37
  38 /* Keyboard (and VGA console)? */
  39 #ifdef CONFIG_VGA_CONSOLE
  40 #define HAS_KEYB 1
  41 #else
  42 #define HAS_KEYB 0
  43 #endif
  44
  45 /* Will / Can the user give input?
  46  * Val Henson has requested that Gemini doesn't wait for the
  47  * user to edit the cmdline or not.
  48  */
  49 #if (defined(CONFIG_SERIAL_8250_CONSOLE) \
  50         || defined(CONFIG_VGA_CONSOLE) \
  51         || defined(CONFIG_SERIAL_MPC52xx_CONSOLE) \
  52         || defined(CONFIG_SERIAL_MPSC_CONSOLE)) \
  53         && !defined(CONFIG_GEMINI)
  54 #define INTERACTIVE_CONSOLE     1
  55 #endif
  56
  57 char *avail_ram;
  58 char *end_avail;
  59 char *zimage_start;
  60 char cmd_preset[] = CMDLINE;
  61 char cmd_buf[256];
  62 char *cmd_line = cmd_buf;
  63 int keyb_present = HAS_KEYB;
  64 int zimage_size;
  65
  66 unsigned long com_port;
  67 unsigned long initrd_size = 0;
  68
  69 /* The linker tells us various locations in the image */
  70 extern char __image_begin, __image_end;
  71 extern char __ramdisk_begin, __ramdisk_end;
  72 extern char _end[];
  73 /* Original location */
  74 extern unsigned long start;
  75
  76 extern int CRT_tstc(void);
  77 extern unsigned long serial_init(int chan, void *ignored);
  78 extern void serial_close(unsigned long com_port);
  79 extern void gunzip(void *, int, unsigned char *, int *);
  80 extern void serial_fixups(void);
  81
  82 /* Allow get_mem_size to be hooked into.  This is the default. */
  83 unsigned long __attribute__ ((weak))
  84 get_mem_size(void)
  85 {
  86         return 0;
  87 }
  88
  89 #if defined(CONFIG_40x)
  90 #define PPC4xx_EMAC0_MR0        EMAC0_BASE
  91 #endif
  92
  93 #if defined(CONFIG_44x) && defined(PPC44x_EMAC0_MR0)
  94 #define PPC4xx_EMAC0_MR0        PPC44x_EMAC0_MR0
  95 #endif
  96
  97 struct bi_record *
  98 decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
  99 {
 100 #ifdef INTERACTIVE_CONSOLE
 101         int timer = 0;
 102         char ch;
 103 #endif
 104         char *cp;
 105         struct bi_record *rec;
 106         unsigned long initrd_loc = 0, TotalMemory = 0;
 107
 108 #if defined(CONFIG_SERIAL_8250_CONSOLE) || defined(CONFIG_SERIAL_MPSC_CONSOLE)
 109         com_port = serial_init(0, NULL);
 110 #endif
 111
 112 #if defined(PPC4xx_EMAC0_MR0)
 113         /* Reset MAL */
 114         mtdcr(DCRN_MALCR(DCRN_MAL_BASE), MALCR_MMSR);
 115         /* Wait for reset */
 116         while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE)) & MALCR_MMSR) {};
 117         /* Reset EMAC */
 118         *(volatile unsigned long *)PPC4xx_EMAC0_MR0 = 0x20000000;
 119         __asm__ __volatile__("eieio");
 120 #endif
 121
 122         /*
 123          * Call get_mem_size(), which is memory controller dependent,
 124          * and we must have the correct file linked in here.
 125          */
 126         TotalMemory = get_mem_size();
 127
 128         /* assume the chunk below 8M is free */
 129         end_avail = (char *)0x00800000;
 130
 131         /*
 132          * Reveal where we were loaded at and where we
 133          * were relocated to.
 134          */
 135         puts("loaded at:     "); puthex(load_addr);
 136         puts(" "); puthex((unsigned long)(load_addr + (4*num_words)));
 137         puts("\n");
 138         if ( (unsigned long)load_addr != (unsigned long)&start )
 139         {
 140                 puts("relocated to:  "); puthex((unsigned long)&start);
 141                 puts(" ");
 142                 puthex((unsigned long)((unsigned long)&start + (4*num_words)));
 143                 puts("\n");
 144         }
 145
 146         /*
 147          * We link ourself to 0x00800000.  When we run, we relocate
 148          * ourselves there.  So we just need __image_begin for the
 149          * start. -- Tom
 150          */
 151         zimage_start = (char *)(unsigned long)(&__image_begin);
 152         zimage_size = (unsigned long)(&__image_end) -
 153                         (unsigned long)(&__image_begin);
 154
 155         initrd_size = (unsigned long)(&__ramdisk_end) -
 156                 (unsigned long)(&__ramdisk_begin);
 157
 158         /*
 159          * The zImage and initrd will be between start and _end, so they've
 160          * already been moved once.  We're good to go now. -- Tom
 161          */
 162         avail_ram = (char *)PAGE_ALIGN((unsigned long)_end);
 163         puts("zimage at:     "); puthex((unsigned long)zimage_start);
 164         puts(" "); puthex((unsigned long)(zimage_size+zimage_start));
 165         puts("\n");
 166
 167         if ( initrd_size ) {
 168                 puts("initrd at:     ");
 169                 puthex((unsigned long)(&__ramdisk_begin));
 170                 puts(" "); puthex((unsigned long)(&__ramdisk_end));puts("\n");
 171         }
 172
 173 #ifndef CONFIG_40x /* don't overwrite the 40x image located at 0x00400000! */
 174         avail_ram = (char *)0x00400000;
 175 #endif
 176         end_avail = (char *)0x00800000;
 177         puts("avail ram:     "); puthex((unsigned long)avail_ram); puts(" ");
 178         puthex((unsigned long)end_avail); puts("\n");
 179
 180         if (keyb_present)
 181                 CRT_tstc();  /* Forces keyboard to be initialized */
 182 #ifdef CONFIG_GEMINI
 183         /*
 184          * If cmd_line is empty and cmd_preset is not, copy cmd_preset
 185          * to cmd_line.  This way we can override cmd_preset with the
 186          * command line from Smon.
 187          */
 188
 189         if ( (cmd_line[0] == '\0') && (cmd_preset[0] != '\0'))
 190                 memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
 191 #endif
 192
 193         /* Display standard Linux/PPC boot prompt for kernel args */
 194         puts("\nLinux/PPC load: ");
 195         cp = cmd_line;
 196         memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
 197         while ( *cp ) putc(*cp++);
 198
 199 #ifdef INTERACTIVE_CONSOLE
 200         /*
 201          * If they have a console, allow them to edit the command line.
 202          * Otherwise, don't bother wasting the five seconds.
 203          */
 204         while (timer++ < 5*1000) {
 205                 if (tstc()) {
 206                         while ((ch = getc()) != '\n' && ch != '\r') {
 207                                 /* Test for backspace/delete */
 208                                 if (ch == '\b' || ch == '\177') {
 209                                         if (cp != cmd_line) {
 210                                                 cp--;
 211                                                 puts("\b \b");
 212                                         }
 213                                 /* Test for ^x/^u (and wipe the line) */
 214                                 } else if (ch == '\030' || ch == '\025') {
 215                                         while (cp != cmd_line) {
 216                                                 cp--;
 217                                                 puts("\b \b");
 218                                         }
 219                                 } else {
 220                                         *cp++ = ch;
 221                                         putc(ch);
 222                                 }
 223                         }
 224                         break;  /* Exit 'timer' loop */
 225                 }
 226                 udelay(1000);  /* 1 msec */
 227         }
 228         *cp = 0;
 229 #endif
 230         puts("\n");
 231
 232         puts("Uncompressing Linux...");
 233         gunzip(NULL, 0x400000, zimage_start, &zimage_size);
 234         puts("done.\n");
 235
 236         /* get the bi_rec address */
 237         rec = bootinfo_addr(zimage_size);
 238
 239         /* We need to make sure that the initrd and bi_recs do not
 240          * overlap. */
 241         if ( initrd_size ) {
 242                 unsigned long rec_loc = (unsigned long) rec;
 243                 initrd_loc = (unsigned long)(&__ramdisk_begin);
 244                 /* If the bi_recs are in the middle of the current
 245                  * initrd, move the initrd to the next MB
 246                  * boundary. */
 247                 if ((rec_loc > initrd_loc) &&
 248                                 ((initrd_loc + initrd_size) > rec_loc)) {
 249                         initrd_loc = _ALIGN((unsigned long)(zimage_size)
 250                                         + (2 << 20) - 1, (2 << 20));
 251                         memmove((void *)initrd_loc, &__ramdisk_begin,
 252                                  initrd_size);
 253                         puts("initrd moved:  "); puthex(initrd_loc);
 254                         puts(" "); puthex(initrd_loc + initrd_size);
 255                         puts("\n");
 256                 }
 257         }
 258
 259         bootinfo_init(rec);
 260         if ( TotalMemory )
 261                 bootinfo_append(BI_MEMSIZE, sizeof(int), (void*)&TotalMemory);
 262
 263         bootinfo_append(BI_CMD_LINE, strlen(cmd_line)+1, (void*)cmd_line);
 264
 265         /* add a bi_rec for the initrd if it exists */
 266         if (initrd_size) {
 267                 unsigned long initrd[2];
 268
 269                 initrd[0] = initrd_loc;
 270                 initrd[1] = initrd_size;
 271
 272                 bootinfo_append(BI_INITRD, sizeof(initrd), &initrd);
 273         }
 274         puts("Now booting the kernel\n");
 275         serial_close(com_port);
 276
 277         return rec;
 278 }
 279
 280 void __attribute__ ((weak))
 281 board_isa_init(void)
 282 {
 283 }
 284
 285 /* Allow decompress_kernel to be hooked into.  This is the default. */
 286 void * __attribute__ ((weak))
 287 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
 288                 void *ign1, void *ign2)
 289 {
 290                 board_isa_init();
 291                 return decompress_kernel(load_addr, num_words, cksum);
 292 }