arch/sparc/mm/btfixup.c

   1 /* $Id: btfixup.c,v 1.10 2000/05/09 17:40:13 davem Exp $
   2  * btfixup.c: Boot time code fixup and relocator, so that
   3  * we can get rid of most indirect calls to achieve single
   4  * image sun4c and srmmu kernel.
   5  *
   6  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <asm/btfixup.h>
  13 #include <asm/page.h>
  14 #include <asm/pgalloc.h>
  15 #include <asm/pgtable.h>
  16 #include <asm/oplib.h>
  17 #include <asm/system.h>
  18 #include <asm/cacheflush.h>
  19
  20 #define BTFIXUP_OPTIMIZE_NOP
  21 #define BTFIXUP_OPTIMIZE_OTHER
  22
  23 extern char *srmmu_name;
  24 static char version[] __initdata = "Boot time fixup v1.6. 4/Mar/98 Jakub Jelinek (jj@ultra.linux.cz). Patching kernel for ";
  25 #ifdef CONFIG_SUN4
  26 static char str_sun4c[] __initdata = "sun4\n";
  27 #else
  28 static char str_sun4c[] __initdata = "sun4c\n";
  29 #endif
  30 static char str_srmmu[] __initdata = "srmmu[%s]/";
  31 static char str_iommu[] __initdata = "iommu\n";
  32 static char str_iounit[] __initdata = "io-unit\n";
  33
  34 static int visited __initdata = 0;
  35 extern unsigned int ___btfixup_start[], ___btfixup_end[], __init_begin[], __init_end[], __init_text_end[];
  36 extern unsigned int _stext[], _end[], __start___ksymtab[], __stop___ksymtab[];
  37 static char wrong_f[] __initdata = "Trying to set f fixup %p to invalid function %08x\n";
  38 static char wrong_b[] __initdata = "Trying to set b fixup %p to invalid function %08x\n";
  39 static char wrong_s[] __initdata = "Trying to set s fixup %p to invalid value %08x\n";
  40 static char wrong_h[] __initdata = "Trying to set h fixup %p to invalid value %08x\n";
  41 static char wrong_a[] __initdata = "Trying to set a fixup %p to invalid value %08x\n";
  42 static char wrong[] __initdata = "Wrong address for %c fixup %p\n";
  43 static char insn_f[] __initdata = "Fixup f %p refers to weird instructions at %p[%08x,%08x]\n";
  44 static char insn_b[] __initdata = "Fixup b %p doesn't refer to a SETHI at %p[%08x]\n";
  45 static char insn_s[] __initdata = "Fixup s %p doesn't refer to an OR at %p[%08x]\n";
  46 static char insn_h[] __initdata = "Fixup h %p doesn't refer to a SETHI at %p[%08x]\n";
  47 static char insn_a[] __initdata = "Fixup a %p doesn't refer to a SETHI nor OR at %p[%08x]\n";
  48 static char insn_i[] __initdata = "Fixup i %p doesn't refer to a valid instruction at %p[%08x]\n";
  49 static char fca_und[] __initdata = "flush_cache_all undefined in btfixup()\n";
  50 static char wrong_setaddr[] __initdata = "Garbled CALL/INT patch at %p[%08x,%08x,%08x]=%08x\n";
  51
  52 #ifdef BTFIXUP_OPTIMIZE_OTHER
  53 static void __init set_addr(unsigned int *addr, unsigned int q1, int fmangled, unsigned int value)
  54 {
  55         if (!fmangled)
  56                 *addr = value;
  57         else {
  58                 unsigned int *q = (unsigned int *)q1;
  59                 if (*addr == 0x01000000) {
  60                         /* Noped */
  61                         *q = value;
  62                 } else if (addr[-1] == *q) {
  63                         /* Moved */
  64                         addr[-1] = value;
  65                         *q = value;
  66                 } else {
  67                         prom_printf(wrong_setaddr, addr-1, addr[-1], *addr, *q, value);
  68                         prom_halt();
  69                 }
  70         }
  71 }
  72 #else
  73 static __inline__ void set_addr(unsigned int *addr, unsigned int q1, int fmangled, unsigned int value)
  74 {
  75         *addr = value;
  76 }
  77 #endif
  78
  79 void __init btfixup(void)
  80 {
  81         unsigned int *p, *q;
  82         int type, count;
  83         unsigned insn;
  84         unsigned *addr;
  85         int fmangled = 0;
  86         void (*flush_cacheall)(void);
  87
  88         if (!visited) {
  89                 visited++;
  90                 printk(version);
  91                 if (ARCH_SUN4C_SUN4)
  92                         printk(str_sun4c);
  93                 else {
  94                         printk(str_srmmu, srmmu_name);
  95                         if (sparc_cpu_model == sun4d)
  96                                 printk(str_iounit);
  97                         else
  98                                 printk(str_iommu);
  99                 }
 100         }
 101         for (p = ___btfixup_start; p < ___btfixup_end; ) {
 102                 count = p[2];
 103                 q = p + 3;
 104                 switch (type = *(unsigned char *)p) {
 105                 case 'f':
 106                         count = p[3];
 107                         q = p + 4;
 108                         if (((p[0] & 1) || p[1])
 109                             && ((p[1] & 3) || (unsigned *)(p[1]) < _stext || (unsigned *)(p[1]) >= _end)) {
 110                                 prom_printf(wrong_f, p, p[1]);
 111                                 prom_halt();
 112                         }
 113                         break;
 114                 case 'b':
 115                         if (p[1] < (unsigned long)__init_begin || p[1] >= (unsigned long)__init_text_end || (p[1] & 3)) {
 116                                 prom_printf(wrong_b, p, p[1]);
 117                                 prom_halt();
 118                         }
 119                         break;
 120                 case 's':
 121                         if (p[1] + 0x1000 >= 0x2000) {
 122                                 prom_printf(wrong_s, p, p[1]);
 123                                 prom_halt();
 124                         }
 125                         break;
 126                 case 'h':
 127                         if (p[1] & 0x3ff) {
 128                                 prom_printf(wrong_h, p, p[1]);
 129                                 prom_halt();
 130                         }
 131                         break;
 132                 case 'a':
 133                         if (p[1] + 0x1000 >= 0x2000 && (p[1] & 0x3ff)) {
 134                                 prom_printf(wrong_a, p, p[1]);
 135                                 prom_halt();
 136                         }
 137                         break;
 138                 }
 139                 if (p[0] & 1) {
 140                         p[0] &= ~1;
 141                         while (count) {
 142                                 fmangled = 0;
 143                                 addr = (unsigned *)*q;
 144                                 if (addr < _stext || addr >= _end) {
 145                                         prom_printf(wrong, type, p);
 146                                         prom_halt();
 147                                 }
 148                                 insn = *addr;
 149 #ifdef BTFIXUP_OPTIMIZE_OTHER
 150                                 if (type != 'f' && q[1]) {
 151                                         insn = *(unsigned int *)q[1];
 152                                         if (!insn || insn == 1)
 153                                                 insn = *addr;
 154                                         else
 155                                                 fmangled = 1;
 156                                 }
 157 #endif
 158                                 switch (type) {
 159                                 case 'f':       /* CALL */
 160                                         if (addr >= __start___ksymtab && addr < __stop___ksymtab) {
 161                                                 *addr = p[1];
 162                                                 break;
 163                                         } else if (!q[1]) {
 164                                                 if ((insn & 0xc1c00000) == 0x01000000) { /* SETHI */
 165                                                         *addr = (insn & 0xffc00000) | (p[1] >> 10); break;
 166                                                 } else if ((insn & 0xc1f82000) == 0x80102000) { /* OR X, %LO(i), Y */
 167                                                         *addr = (insn & 0xffffe000) | (p[1] & 0x3ff); break;
 168                                                 } else if ((insn & 0xc0000000) != 0x40000000) { /* !CALL */
 169                                 bad_f:
 170                                                         prom_printf(insn_f, p, addr, insn, addr[1]);
 171                                                         prom_halt();
 172                                                 }
 173                                         } else if (q[1] != 1)
 174                                                 addr[1] = q[1];
 175                                         if (p[2] == BTFIXUPCALL_NORM) {
 176                                 norm_f:
 177                                                 *addr = 0x40000000 | ((p[1] - (unsigned)addr) >> 2);
 178                                                 q[1] = 0;
 179                                                 break;
 180                                         }
 181 #ifndef BTFIXUP_OPTIMIZE_NOP
 182                                         goto norm_f;
 183 #else
 184                                         if (!(addr[1] & 0x80000000)) {
 185                                                 if ((addr[1] & 0xc1c00000) != 0x01000000)       /* !SETHI */
 186                                                         goto bad_f; /* CALL, Bicc, FBfcc, CBccc are weird in delay slot, aren't they? */
 187                                         } else {
 188                                                 if ((addr[1] & 0x01800000) == 0x01800000) {
 189                                                         if ((addr[1] & 0x01f80000) == 0x01e80000) {
 190                                                                 /* RESTORE */
 191                                                                 goto norm_f; /* It is dangerous to patch that */
 192                                                         }
 193                                                         goto bad_f;
 194                                                 }
 195                                                 if ((addr[1] & 0xffffe003) == 0x9e03e000) {
 196                                                         /* ADD %O7, XX, %o7 */
 197                                                         int displac = (addr[1] << 19);
 198
 199                                                         displac = (displac >> 21) + 2;
 200                                                         *addr = (0x10800000) + (displac & 0x3fffff);
 201                                                         q[1] = addr[1];
 202                                                         addr[1] = p[2];
 203                                                         break;
 204                                                 }
 205                                                 if ((addr[1] & 0x201f) == 0x200f || (addr[1] & 0x7c000) == 0x3c000)
 206                                                         goto norm_f; /* Someone is playing bad tricks with us: rs1 or rs2 is o7 */
 207                                                 if ((addr[1] & 0x3e000000) == 0x1e000000)
 208                                                         goto norm_f; /* rd is %o7. We'd better take care. */
 209                                         }
 210                                         if (p[2] == BTFIXUPCALL_NOP) {
 211                                                 *addr = 0x01000000;
 212                                                 q[1] = 1;
 213                                                 break;
 214                                         }
 215 #ifndef BTFIXUP_OPTIMIZE_OTHER
 216                                         goto norm_f;
 217 #else
 218                                         if (addr[1] == 0x01000000) {    /* NOP in the delay slot */
 219                                                 q[1] = addr[1];
 220                                                 *addr = p[2];
 221                                                 break;
 222                                         }
 223                                         if ((addr[1] & 0xc0000000) != 0xc0000000) {
 224                                                 /* Not a memory operation */
 225                                                 if ((addr[1] & 0x30000000) == 0x10000000) {
 226                                                         /* Ok, non-memory op with rd %oX */
 227                                                         if ((addr[1] & 0x3e000000) == 0x1c000000)
 228                                                                 goto bad_f; /* Aiee. Someone is playing strange %sp tricks */
 229                                                         if ((addr[1] & 0x3e000000) > 0x12000000 ||
 230                                                             ((addr[1] & 0x3e000000) == 0x12000000 &&
 231                                                              p[2] != BTFIXUPCALL_STO1O0 && p[2] != BTFIXUPCALL_SWAPO0O1) ||
 232                                                             ((p[2] & 0xffffe000) == BTFIXUPCALL_RETINT(0))) {
 233                                                                 /* Nobody uses the result. We can nop it out. */
 234                                                                 *addr = p[2];
 235                                                                 q[1] = addr[1];
 236                                                                 addr[1] = 0x01000000;
 237                                                                 break;
 238                                                         }
 239                                                         if ((addr[1] & 0xf1ffffe0) == 0x90100000) {
 240                                                                 /* MOV %reg, %Ox */
 241                                                                 if ((addr[1] & 0x3e000000) == 0x10000000 &&
 242                                                                     (p[2] & 0x7c000) == 0x20000) {
 243                                                                         /* Ok, it is call xx; mov reg, %o0 and call optimizes
 244                                                                            to doing something on %o0. Patch the patch. */
 245                                                                         *addr = (p[2] & ~0x7c000) | ((addr[1] & 0x1f) << 14);
 246                                                                         q[1] = addr[1];
 247                                                                         addr[1] = 0x01000000;
 248                                                                         break;
 249                                                                 }
 250                                                                 if ((addr[1] & 0x3e000000) == 0x12000000 &&
 251                                                                     p[2] == BTFIXUPCALL_STO1O0) {
 252                                                                         *addr = (p[2] & ~0x3e000000) | ((addr[1] & 0x1f) << 25);
 253                                                                         q[1] = addr[1];
 254                                                                         addr[1] = 0x01000000;
 255                                                                         break;
 256                                                                 }
 257                                                         }
 258                                                 }
 259                                         }
 260                                         *addr = addr[1];
 261                                         q[1] = addr[1];
 262                                         addr[1] = p[2];
 263                                         break;
 264 #endif /* BTFIXUP_OPTIMIZE_OTHER */
 265 #endif /* BTFIXUP_OPTIMIZE_NOP */
 266                                 case 'b':       /* BLACKBOX */
 267                                         /* Has to be sethi i, xx */
 268                                         if ((insn & 0xc1c00000) != 0x01000000) {
 269                                                 prom_printf(insn_b, p, addr, insn);
 270                                                 prom_halt();
 271                                         } else {
 272                                                 void (*do_fixup)(unsigned *);
 273
 274                                                 do_fixup = (void (*)(unsigned *))p[1];
 275                                                 do_fixup(addr);
 276                                         }
 277                                         break;
 278                                 case 's':       /* SIMM13 */
 279                                         /* Has to be or %g0, i, xx */
 280                                         if ((insn & 0xc1ffe000) != 0x80102000) {
 281                                                 prom_printf(insn_s, p, addr, insn);
 282                                                 prom_halt();
 283                                         }
 284                                         set_addr(addr, q[1], fmangled, (insn & 0xffffe000) | (p[1] & 0x1fff));
 285                                         break;
 286                                 case 'h':       /* SETHI */
 287                                         /* Has to be sethi i, xx */
 288                                         if ((insn & 0xc1c00000) != 0x01000000) {
 289                                                 prom_printf(insn_h, p, addr, insn);
 290                                                 prom_halt();
 291                                         }
 292                                         set_addr(addr, q[1], fmangled, (insn & 0xffc00000) | (p[1] >> 10));
 293                                         break;
 294                                 case 'a':       /* HALF */
 295                                         /* Has to be sethi i, xx or or %g0, i, xx */
 296                                         if ((insn & 0xc1c00000) != 0x01000000 &&
 297                                             (insn & 0xc1ffe000) != 0x80102000) {
 298                                                 prom_printf(insn_a, p, addr, insn);
 299                                                 prom_halt();
 300                                         }
 301                                         if (p[1] & 0x3ff)
 302                                                 set_addr(addr, q[1], fmangled,
 303                                                         (insn & 0x3e000000) | 0x80102000 | (p[1] & 0x1fff));
 304                                         else
 305                                                 set_addr(addr, q[1], fmangled,
 306                                                         (insn & 0x3e000000) | 0x01000000 | (p[1] >> 10));
 307                                         break;
 308                                 case 'i':       /* INT */
 309                                         if ((insn & 0xc1c00000) == 0x01000000) /* %HI */
 310                                                 set_addr(addr, q[1], fmangled, (insn & 0xffc00000) | (p[1] >> 10));
 311                                         else if ((insn & 0x80002000) == 0x80002000 &&
 312                                                  (insn & 0x01800000) != 0x01800000) /* %LO */
 313                                                 set_addr(addr, q[1], fmangled, (insn & 0xffffe000) | (p[1] & 0x3ff));
 314                                         else {
 315                                                 prom_printf(insn_i, p, addr, insn);
 316                                                 prom_halt();
 317                                         }
 318                                         break;
 319                                 }
 320                                 count -= 2;
 321                                 q += 2;
 322                         }
 323                 } else
 324                         p = q + count;
 325         }
 326 #ifdef CONFIG_SMP
 327         flush_cacheall = (void (*)(void))BTFIXUPVAL_CALL(local_flush_cache_all);
 328 #else
 329         flush_cacheall = (void (*)(void))BTFIXUPVAL_CALL(flush_cache_all);
 330 #endif
 331         if (!flush_cacheall) {
 332                 prom_printf(fca_und);
 333                 prom_halt();
 334         }
 335         (*flush_cacheall)();
 336 }