arch/sparc64/kernel/head.S

   1 /* head.S: Initial boot code for the Sparc64 port of Linux.
   2  *
   3  * Copyright (C) 1996, 1997, 2007 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1996 David Sitsky (David.Sitsky@anu.edu.au)
   5  * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  * Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
   7  */
   8
   9 #include <linux/version.h>
  10 #include <linux/errno.h>
  11 #include <linux/threads.h>
  12 #include <linux/init.h>
  13 #include <asm/thread_info.h>
  14 #include <asm/asi.h>
  15 #include <asm/pstate.h>
  16 #include <asm/ptrace.h>
  17 #include <asm/spitfire.h>
  18 #include <asm/page.h>
  19 #include <asm/pgtable.h>
  20 #include <asm/errno.h>
  21 #include <asm/signal.h>
  22 #include <asm/processor.h>
  23 #include <asm/lsu.h>
  24 #include <asm/dcr.h>
  25 #include <asm/dcu.h>
  26 #include <asm/head.h>
  27 #include <asm/ttable.h>
  28 #include <asm/mmu.h>
  29 #include <asm/cpudata.h>
  30
  31 /* This section from from _start to sparc64_boot_end should fit into
  32  * 0x0000000000404000 to 0x0000000000408000.
  33  */
  34         .text
  35         .globl  start, _start, stext, _stext
  36 _start:
  37 start:
  38 _stext:
  39 stext:
  40 ! 0x0000000000404000
  41         b       sparc64_boot
  42          flushw                                 /* Flush register file.      */
  43
  44 /* This stuff has to be in sync with SILO and other potential boot loaders
  45  * Fields should be kept upward compatible and whenever any change is made,
  46  * HdrS version should be incremented.
  47  */
  48         .global root_flags, ram_flags, root_dev
  49         .global sparc_ramdisk_image, sparc_ramdisk_size
  50         .global sparc_ramdisk_image64
  51
  52         .ascii  "HdrS"
  53         .word   LINUX_VERSION_CODE
  54
  55         /* History:
  56          *
  57          * 0x0300 : Supports being located at other than 0x4000
  58          * 0x0202 : Supports kernel params string
  59          * 0x0201 : Supports reboot_command
  60          */
  61         .half   0x0301          /* HdrS version */
  62
  63 root_flags:
  64         .half   1
  65 root_dev:
  66         .half   0
  67 ram_flags:
  68         .half   0
  69 sparc_ramdisk_image:
  70         .word   0
  71 sparc_ramdisk_size:
  72         .word   0
  73         .xword  reboot_command
  74         .xword  bootstr_info
  75 sparc_ramdisk_image64:
  76         .xword  0
  77         .word   _end
  78
  79         /* PROM cif handler code address is in %o4.  */
  80 sparc64_boot:
  81         mov     %o4, %l7
  82
  83         /* We need to remap the kernel.  Use position independant
  84          * code to remap us to KERNBASE.
  85          *
  86          * SILO can invoke us with 32-bit address masking enabled,
  87          * so make sure that's clear.
  88          */
  89         rdpr    %pstate, %g1
  90         andn    %g1, PSTATE_AM, %g1
  91         wrpr    %g1, 0x0, %pstate
  92         ba,a,pt %xcc, 1f
  93
  94         .globl  prom_finddev_name, prom_chosen_path, prom_root_node
  95         .globl  prom_getprop_name, prom_mmu_name, prom_peer_name
  96         .globl  prom_callmethod_name, prom_translate_name, prom_root_compatible
  97         .globl  prom_map_name, prom_unmap_name, prom_mmu_ihandle_cache
  98         .globl  prom_boot_mapped_pc, prom_boot_mapping_mode
  99         .globl  prom_boot_mapping_phys_high, prom_boot_mapping_phys_low
 100         .globl  prom_compatible_name, prom_cpu_path, prom_cpu_compatible
 101         .globl  is_sun4v, sun4v_chip_type
 102 prom_peer_name:
 103         .asciz  "peer"
 104 prom_compatible_name:
 105         .asciz  "compatible"
 106 prom_finddev_name:
 107         .asciz  "finddevice"
 108 prom_chosen_path:
 109         .asciz  "/chosen"
 110 prom_cpu_path:
 111         .asciz  "/cpu"
 112 prom_getprop_name:
 113         .asciz  "getprop"
 114 prom_mmu_name:
 115         .asciz  "mmu"
 116 prom_callmethod_name:
 117         .asciz  "call-method"
 118 prom_translate_name:
 119         .asciz  "translate"
 120 prom_map_name:
 121         .asciz  "map"
 122 prom_unmap_name:
 123         .asciz  "unmap"
 124 prom_sun4v_name:
 125         .asciz  "sun4v"
 126 prom_niagara_prefix:
 127         .asciz  "SUNW,UltraSPARC-T"
 128         .align  4
 129 prom_root_compatible:
 130         .skip   64
 131 prom_cpu_compatible:
 132         .skip   64
 133 prom_root_node:
 134         .word   0
 135 prom_mmu_ihandle_cache:
 136         .word   0
 137 prom_boot_mapped_pc:
 138         .word   0
 139 prom_boot_mapping_mode:
 140         .word   0
 141         .align  8
 142 prom_boot_mapping_phys_high:
 143         .xword  0
 144 prom_boot_mapping_phys_low:
 145         .xword  0
 146 is_sun4v:
 147         .word   0
 148 sun4v_chip_type:
 149         .word   SUN4V_CHIP_INVALID
 150 1:
 151         rd      %pc, %l0
 152
 153         mov     (1b - prom_peer_name), %l1
 154         sub     %l0, %l1, %l1
 155         mov     0, %l2
 156
 157         /* prom_root_node = prom_peer(0) */
 158         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "peer"
 159         mov     1, %l3
 160         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 1
 161         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 162         stx     %l2, [%sp + 2047 + 128 + 0x18]  ! arg1, 0
 163         stx     %g0, [%sp + 2047 + 128 + 0x20]  ! ret1
 164         call    %l7
 165          add    %sp, (2047 + 128), %o0          ! argument array
 166
 167         ldx     [%sp + 2047 + 128 + 0x20], %l4  ! prom root node
 168         mov     (1b - prom_root_node), %l1
 169         sub     %l0, %l1, %l1
 170         stw     %l4, [%l1]
 171
 172         mov     (1b - prom_getprop_name), %l1
 173         mov     (1b - prom_compatible_name), %l2
 174         mov     (1b - prom_root_compatible), %l5
 175         sub     %l0, %l1, %l1
 176         sub     %l0, %l2, %l2
 177         sub     %l0, %l5, %l5
 178
 179         /* prom_getproperty(prom_root_node, "compatible",
 180          *                  &prom_root_compatible, 64)
 181          */
 182         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "getprop"
 183         mov     4, %l3
 184         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 4
 185         mov     1, %l3
 186         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 187         stx     %l4, [%sp + 2047 + 128 + 0x18]  ! arg1, prom_root_node
 188         stx     %l2, [%sp + 2047 + 128 + 0x20]  ! arg2, "compatible"
 189         stx     %l5, [%sp + 2047 + 128 + 0x28]  ! arg3, &prom_root_compatible
 190         mov     64, %l3
 191         stx     %l3, [%sp + 2047 + 128 + 0x30]  ! arg4, size
 192         stx     %g0, [%sp + 2047 + 128 + 0x38]  ! ret1
 193         call    %l7
 194          add    %sp, (2047 + 128), %o0          ! argument array
 195
 196         mov     (1b - prom_finddev_name), %l1
 197         mov     (1b - prom_chosen_path), %l2
 198         mov     (1b - prom_boot_mapped_pc), %l3
 199         sub     %l0, %l1, %l1
 200         sub     %l0, %l2, %l2
 201         sub     %l0, %l3, %l3
 202         stw     %l0, [%l3]
 203         sub     %sp, (192 + 128), %sp
 204
 205         /* chosen_node = prom_finddevice("/chosen") */
 206         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "finddevice"
 207         mov     1, %l3
 208         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 1
 209         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 210         stx     %l2, [%sp + 2047 + 128 + 0x18]  ! arg1, "/chosen"
 211         stx     %g0, [%sp + 2047 + 128 + 0x20]  ! ret1
 212         call    %l7
 213          add    %sp, (2047 + 128), %o0          ! argument array
 214
 215         ldx     [%sp + 2047 + 128 + 0x20], %l4  ! chosen device node
 216
 217         mov     (1b - prom_getprop_name), %l1
 218         mov     (1b - prom_mmu_name), %l2
 219         mov     (1b - prom_mmu_ihandle_cache), %l5
 220         sub     %l0, %l1, %l1
 221         sub     %l0, %l2, %l2
 222         sub     %l0, %l5, %l5
 223
 224         /* prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu") */
 225         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "getprop"
 226         mov     4, %l3
 227         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 4
 228         mov     1, %l3
 229         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 230         stx     %l4, [%sp + 2047 + 128 + 0x18]  ! arg1, chosen_node
 231         stx     %l2, [%sp + 2047 + 128 + 0x20]  ! arg2, "mmu"
 232         stx     %l5, [%sp + 2047 + 128 + 0x28]  ! arg3, &prom_mmu_ihandle_cache
 233         mov     4, %l3
 234         stx     %l3, [%sp + 2047 + 128 + 0x30]  ! arg4, sizeof(arg3)
 235         stx     %g0, [%sp + 2047 + 128 + 0x38]  ! ret1
 236         call    %l7
 237          add    %sp, (2047 + 128), %o0          ! argument array
 238
 239         mov     (1b - prom_callmethod_name), %l1
 240         mov     (1b - prom_translate_name), %l2
 241         sub     %l0, %l1, %l1
 242         sub     %l0, %l2, %l2
 243         lduw    [%l5], %l5                      ! prom_mmu_ihandle_cache
 244
 245         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "call-method"
 246         mov     3, %l3
 247         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 3
 248         mov     5, %l3
 249         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 5
 250         stx     %l2, [%sp + 2047 + 128 + 0x18]  ! arg1: "translate"
 251         stx     %l5, [%sp + 2047 + 128 + 0x20]  ! arg2: prom_mmu_ihandle_cache
 252         /* PAGE align */
 253         srlx    %l0, 13, %l3
 254         sllx    %l3, 13, %l3
 255         stx     %l3, [%sp + 2047 + 128 + 0x28]  ! arg3: vaddr, our PC
 256         stx     %g0, [%sp + 2047 + 128 + 0x30]  ! res1
 257         stx     %g0, [%sp + 2047 + 128 + 0x38]  ! res2
 258         stx     %g0, [%sp + 2047 + 128 + 0x40]  ! res3
 259         stx     %g0, [%sp + 2047 + 128 + 0x48]  ! res4
 260         stx     %g0, [%sp + 2047 + 128 + 0x50]  ! res5
 261         call    %l7
 262          add    %sp, (2047 + 128), %o0          ! argument array
 263
 264         ldx     [%sp + 2047 + 128 + 0x40], %l1  ! translation mode
 265         mov     (1b - prom_boot_mapping_mode), %l4
 266         sub     %l0, %l4, %l4
 267         stw     %l1, [%l4]
 268         mov     (1b - prom_boot_mapping_phys_high), %l4
 269         sub     %l0, %l4, %l4
 270         ldx     [%sp + 2047 + 128 + 0x48], %l2  ! physaddr high
 271         stx     %l2, [%l4 + 0x0]
 272         ldx     [%sp + 2047 + 128 + 0x50], %l3  ! physaddr low
 273         /* 4MB align */
 274         srlx    %l3, 22, %l3
 275         sllx    %l3, 22, %l3
 276         stx     %l3, [%l4 + 0x8]
 277
 278         /* Leave service as-is, "call-method" */
 279         mov     7, %l3
 280         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 7
 281         mov     1, %l3
 282         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 283         mov     (1b - prom_map_name), %l3
 284         sub     %l0, %l3, %l3
 285         stx     %l3, [%sp + 2047 + 128 + 0x18]  ! arg1: "map"
 286         /* Leave arg2 as-is, prom_mmu_ihandle_cache */
 287         mov     -1, %l3
 288         stx     %l3, [%sp + 2047 + 128 + 0x28]  ! arg3: mode (-1 default)
 289         sethi   %hi(8 * 1024 * 1024), %l3
 290         stx     %l3, [%sp + 2047 + 128 + 0x30]  ! arg4: size (8MB)
 291         sethi   %hi(KERNBASE), %l3
 292         stx     %l3, [%sp + 2047 + 128 + 0x38]  ! arg5: vaddr (KERNBASE)
 293         stx     %g0, [%sp + 2047 + 128 + 0x40]  ! arg6: empty
 294         mov     (1b - prom_boot_mapping_phys_low), %l3
 295         sub     %l0, %l3, %l3
 296         ldx     [%l3], %l3
 297         stx     %l3, [%sp + 2047 + 128 + 0x48]  ! arg7: phys addr
 298         call    %l7
 299          add    %sp, (2047 + 128), %o0          ! argument array
 300
 301         add     %sp, (192 + 128), %sp
 302
 303         sethi   %hi(prom_root_compatible), %g1
 304         or      %g1, %lo(prom_root_compatible), %g1
 305         sethi   %hi(prom_sun4v_name), %g7
 306         or      %g7, %lo(prom_sun4v_name), %g7
 307         mov     5, %g3
 308 90:     ldub    [%g7], %g2
 309         ldub    [%g1], %g4
 310         cmp     %g2, %g4
 311         bne,pn  %icc, 80f
 312          add    %g7, 1, %g7
 313         subcc   %g3, 1, %g3
 314         bne,pt  %xcc, 90b
 315          add    %g1, 1, %g1
 316
 317         sethi   %hi(is_sun4v), %g1
 318         or      %g1, %lo(is_sun4v), %g1
 319         mov     1, %g7
 320         stw     %g7, [%g1]
 321
 322         /* cpu_node = prom_finddevice("/cpu") */
 323         mov     (1b - prom_finddev_name), %l1
 324         mov     (1b - prom_cpu_path), %l2
 325         sub     %l0, %l1, %l1
 326         sub     %l0, %l2, %l2
 327         sub     %sp, (192 + 128), %sp
 328
 329         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "finddevice"
 330         mov     1, %l3
 331         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 1
 332         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 333         stx     %l2, [%sp + 2047 + 128 + 0x18]  ! arg1, "/cpu"
 334         stx     %g0, [%sp + 2047 + 128 + 0x20]  ! ret1
 335         call    %l7
 336          add    %sp, (2047 + 128), %o0          ! argument array
 337
 338         ldx     [%sp + 2047 + 128 + 0x20], %l4  ! cpu device node
 339
 340         mov     (1b - prom_getprop_name), %l1
 341         mov     (1b - prom_compatible_name), %l2
 342         mov     (1b - prom_cpu_compatible), %l5
 343         sub     %l0, %l1, %l1
 344         sub     %l0, %l2, %l2
 345         sub     %l0, %l5, %l5
 346
 347         /* prom_getproperty(cpu_node, "compatible",
 348          *                  &prom_cpu_compatible, 64)
 349          */
 350         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "getprop"
 351         mov     4, %l3
 352         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 4
 353         mov     1, %l3
 354         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 355         stx     %l4, [%sp + 2047 + 128 + 0x18]  ! arg1, cpu_node
 356         stx     %l2, [%sp + 2047 + 128 + 0x20]  ! arg2, "compatible"
 357         stx     %l5, [%sp + 2047 + 128 + 0x28]  ! arg3, &prom_cpu_compatible
 358         mov     64, %l3
 359         stx     %l3, [%sp + 2047 + 128 + 0x30]  ! arg4, size
 360         stx     %g0, [%sp + 2047 + 128 + 0x38]  ! ret1
 361         call    %l7
 362          add    %sp, (2047 + 128), %o0          ! argument array
 363
 364         add     %sp, (192 + 128), %sp
 365
 366         sethi   %hi(prom_cpu_compatible), %g1
 367         or      %g1, %lo(prom_cpu_compatible), %g1
 368         sethi   %hi(prom_niagara_prefix), %g7
 369         or      %g7, %lo(prom_niagara_prefix), %g7
 370         mov     17, %g3
 371 90:     ldub    [%g7], %g2
 372         ldub    [%g1], %g4
 373         cmp     %g2, %g4
 374         bne,pn  %icc, 4f
 375          add    %g7, 1, %g7
 376         subcc   %g3, 1, %g3
 377         bne,pt  %xcc, 90b
 378          add    %g1, 1, %g1
 379
 380         sethi   %hi(prom_cpu_compatible), %g1
 381         or      %g1, %lo(prom_cpu_compatible), %g1
 382         ldub    [%g1 + 17], %g2
 383         cmp     %g2, '1'
 384         be,pt   %xcc, 5f
 385          mov    SUN4V_CHIP_NIAGARA1, %g4
 386         cmp     %g2, '2'
 387         be,pt   %xcc, 5f
 388          mov    SUN4V_CHIP_NIAGARA2, %g4
 389 4:
 390         mov     SUN4V_CHIP_UNKNOWN, %g4
 391 5:      sethi   %hi(sun4v_chip_type), %g2
 392         or      %g2, %lo(sun4v_chip_type), %g2
 393         stw     %g4, [%g2]
 394
 395 80:
 396         BRANCH_IF_SUN4V(g1, jump_to_sun4u_init)
 397         BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
 398         BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
 399         ba,pt   %xcc, spitfire_boot
 400          nop
 401
 402 cheetah_plus_boot:
 403         /* Preserve OBP chosen DCU and DCR register settings.  */
 404         ba,pt   %xcc, cheetah_generic_boot
 405          nop
 406
 407 cheetah_boot:
 408         mov     DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
 409         wr      %g1, %asr18
 410
 411         sethi   %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
 412         or      %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
 413         sllx    %g7, 32, %g7
 414         or      %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7
 415         stxa    %g7, [%g0] ASI_DCU_CONTROL_REG
 416         membar  #Sync
 417
 418 cheetah_generic_boot:
 419         mov     TSB_EXTENSION_P, %g3
 420         stxa    %g0, [%g3] ASI_DMMU
 421         stxa    %g0, [%g3] ASI_IMMU
 422         membar  #Sync
 423
 424         mov     TSB_EXTENSION_S, %g3
 425         stxa    %g0, [%g3] ASI_DMMU
 426         membar  #Sync
 427
 428         mov     TSB_EXTENSION_N, %g3
 429         stxa    %g0, [%g3] ASI_DMMU
 430         stxa    %g0, [%g3] ASI_IMMU
 431         membar  #Sync
 432
 433         ba,a,pt %xcc, jump_to_sun4u_init
 434
 435 spitfire_boot:
 436         /* Typically PROM has already enabled both MMU's and both on-chip
 437          * caches, but we do it here anyway just to be paranoid.
 438          */
 439         mov     (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1
 440         stxa    %g1, [%g0] ASI_LSU_CONTROL
 441         membar  #Sync
 442
 443 jump_to_sun4u_init:
 444         /*
 445          * Make sure we are in privileged mode, have address masking,
 446          * using the ordinary globals and have enabled floating
 447          * point.
 448          *
 449          * Again, typically PROM has left %pil at 13 or similar, and
 450          * (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate.
 451          */
 452         wrpr    %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
 453         wr      %g0, 0, %fprs
 454
 455         set     sun4u_init, %g2
 456         jmpl    %g2 + %g0, %g0
 457          nop
 458
 459         .section        .text.init.refok
 460 sun4u_init:
 461         BRANCH_IF_SUN4V(g1, sun4v_init)
 462
 463         /* Set ctx 0 */
 464         mov             PRIMARY_CONTEXT, %g7
 465         stxa            %g0, [%g7] ASI_DMMU
 466         membar          #Sync
 467
 468         mov             SECONDARY_CONTEXT, %g7
 469         stxa            %g0, [%g7] ASI_DMMU
 470         membar  #Sync
 471
 472         ba,pt           %xcc, sun4u_continue
 473          nop
 474
 475 sun4v_init:
 476         /* Set ctx 0 */
 477         mov             PRIMARY_CONTEXT, %g7
 478         stxa            %g0, [%g7] ASI_MMU
 479         membar          #Sync
 480
 481         mov             SECONDARY_CONTEXT, %g7
 482         stxa            %g0, [%g7] ASI_MMU
 483         membar          #Sync
 484         ba,pt           %xcc, niagara_tlb_fixup
 485          nop
 486
 487 sun4u_continue:
 488         BRANCH_IF_ANY_CHEETAH(g1, g7, cheetah_tlb_fixup)
 489
 490         ba,pt   %xcc, spitfire_tlb_fixup
 491          nop
 492
 493 niagara_tlb_fixup:
 494         mov     3, %g2          /* Set TLB type to hypervisor. */
 495         sethi   %hi(tlb_type), %g1
 496         stw     %g2, [%g1 + %lo(tlb_type)]
 497
 498         /* Patch copy/clear ops.  */
 499         sethi   %hi(sun4v_chip_type), %g1
 500         lduw    [%g1 + %lo(sun4v_chip_type)], %g1
 501         cmp     %g1, SUN4V_CHIP_NIAGARA1
 502         be,pt   %xcc, niagara_patch
 503          cmp    %g1, SUN4V_CHIP_NIAGARA2
 504         be,pt   %xcc, niagara2_patch
 505          nop
 506
 507         call    generic_patch_copyops
 508          nop
 509         call    generic_patch_bzero
 510          nop
 511         call    generic_patch_pageops
 512          nop
 513
 514         ba,a,pt %xcc, 80f
 515 niagara2_patch:
 516         call    niagara2_patch_copyops
 517          nop
 518         call    niagara_patch_bzero
 519          nop
 520         call    niagara2_patch_pageops
 521          nop
 522
 523         ba,a,pt %xcc, 80f
 524
 525 niagara_patch:
 526         call    niagara_patch_copyops
 527          nop
 528         call    niagara_patch_bzero
 529          nop
 530         call    niagara_patch_pageops
 531          nop
 532
 533 80:
 534         /* Patch TLB/cache ops.  */
 535         call    hypervisor_patch_cachetlbops
 536          nop
 537
 538         ba,pt   %xcc, tlb_fixup_done
 539          nop
 540
 541 cheetah_tlb_fixup:
 542         mov     2, %g2          /* Set TLB type to cheetah+. */
 543         BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
 544
 545         mov     1, %g2          /* Set TLB type to cheetah. */
 546
 547 1:      sethi   %hi(tlb_type), %g1
 548         stw     %g2, [%g1 + %lo(tlb_type)]
 549
 550         /* Patch copy/page operations to cheetah optimized versions. */
 551         call    cheetah_patch_copyops
 552          nop
 553         call    cheetah_patch_copy_page
 554          nop
 555         call    cheetah_patch_cachetlbops
 556          nop
 557
 558         ba,pt   %xcc, tlb_fixup_done
 559          nop
 560
 561 spitfire_tlb_fixup:
 562         /* Set TLB type to spitfire. */
 563         mov     0, %g2
 564         sethi   %hi(tlb_type), %g1
 565         stw     %g2, [%g1 + %lo(tlb_type)]
 566
 567 tlb_fixup_done:
 568         sethi   %hi(init_thread_union), %g6
 569         or      %g6, %lo(init_thread_union), %g6
 570         ldx     [%g6 + TI_TASK], %g4
 571         mov     %sp, %l6
 572
 573         wr      %g0, ASI_P, %asi
 574         mov     1, %g1
 575         sllx    %g1, THREAD_SHIFT, %g1
 576         sub     %g1, (STACKFRAME_SZ + STACK_BIAS), %g1
 577         add     %g6, %g1, %sp
 578         mov     0, %fp
 579
 580         /* Set per-cpu pointer initially to zero, this makes
 581          * the boot-cpu use the in-kernel-image per-cpu areas
 582          * before setup_per_cpu_area() is invoked.
 583          */
 584         clr     %g5
 585
 586         wrpr    %g0, 0, %wstate
 587         wrpr    %g0, 0x0, %tl
 588
 589         /* Clear the bss */
 590         sethi   %hi(__bss_start), %o0
 591         or      %o0, %lo(__bss_start), %o0
 592         sethi   %hi(_end), %o1
 593         or      %o1, %lo(_end), %o1
 594         call    __bzero
 595          sub    %o1, %o0, %o1
 596
 597 #ifdef CONFIG_LOCKDEP
 598         /* We have this call this super early, as even prom_init can grab
 599          * spinlocks and thus call into the lockdep code.
 600          */
 601         call    lockdep_init
 602          nop
 603 #endif
 604
 605         mov     %l6, %o1                        ! OpenPROM stack
 606         call    prom_init
 607          mov    %l7, %o0                        ! OpenPROM cif handler
 608
 609         /* Initialize current_thread_info()->cpu as early as possible.
 610          * In order to do that accurately we have to patch up the get_cpuid()
 611          * assembler sequences.  And that, in turn, requires that we know
 612          * if we are on a Starfire box or not.  While we're here, patch up
 613          * the sun4v sequences as well.
 614          */
 615         call    check_if_starfire
 616          nop
 617         call    per_cpu_patch
 618          nop
 619         call    sun4v_patch
 620          nop
 621
 622 #ifdef CONFIG_SMP
 623         call    hard_smp_processor_id
 624          nop
 625         cmp     %o0, NR_CPUS
 626         blu,pt  %xcc, 1f
 627          nop
 628         call    boot_cpu_id_too_large
 629          nop
 630         /* Not reached... */
 631
 632 1:
 633 #else
 634         mov     0, %o0
 635 #endif
 636         sth     %o0, [%g6 + TI_CPU]
 637
 638         /* Off we go.... */
 639         call    start_kernel
 640          nop
 641         /* Not reached... */
 642
 643         .previous
 644
 645         /* This is meant to allow the sharing of this code between
 646          * boot processor invocation (via setup_tba() below) and
 647          * secondary processor startup (via trampoline.S).  The
 648          * former does use this code, the latter does not yet due
 649          * to some complexities.  That should be fixed up at some
 650          * point.
 651          *
 652          * There used to be enormous complexity wrt. transferring
 653          * over from the firwmare's trap table to the Linux kernel's.
 654          * For example, there was a chicken & egg problem wrt. building
 655          * the OBP page tables, yet needing to be on the Linux kernel
 656          * trap table (to translate PAGE_OFFSET addresses) in order to
 657          * do that.
 658          *
 659          * We now handle OBP tlb misses differently, via linear lookups
 660          * into the prom_trans[] array.  So that specific problem no
 661          * longer exists.  Yet, unfortunately there are still some issues
 662          * preventing trampoline.S from using this code... ho hum.
 663          */
 664         .globl  setup_trap_table
 665 setup_trap_table:
 666         save    %sp, -192, %sp
 667
 668         /* Force interrupts to be disabled. */
 669         rdpr    %pstate, %l0
 670         andn    %l0, PSTATE_IE, %o1
 671         wrpr    %o1, 0x0, %pstate
 672         rdpr    %pil, %l1
 673         wrpr    %g0, 15, %pil
 674
 675         /* Make the firmware call to jump over to the Linux trap table.  */
 676         sethi   %hi(is_sun4v), %o0
 677         lduw    [%o0 + %lo(is_sun4v)], %o0
 678         brz,pt  %o0, 1f
 679          nop
 680
 681         TRAP_LOAD_TRAP_BLOCK(%g2, %g3)
 682         add     %g2, TRAP_PER_CPU_FAULT_INFO, %g2
 683         stxa    %g2, [%g0] ASI_SCRATCHPAD
 684
 685         /* Compute physical address:
 686          *
 687          * paddr = kern_base + (mmfsa_vaddr - KERNBASE)
 688          */
 689         sethi   %hi(KERNBASE), %g3
 690         sub     %g2, %g3, %g2
 691         sethi   %hi(kern_base), %g3
 692         ldx     [%g3 + %lo(kern_base)], %g3
 693         add     %g2, %g3, %o1
 694
 695         call    prom_set_trap_table_sun4v
 696          sethi  %hi(sparc64_ttable_tl0), %o0
 697
 698         ba,pt   %xcc, 2f
 699          nop
 700
 701 1:      call    prom_set_trap_table
 702          sethi  %hi(sparc64_ttable_tl0), %o0
 703
 704         /* Start using proper page size encodings in ctx register.  */
 705 2:      sethi   %hi(sparc64_kern_pri_context), %g3
 706         ldx     [%g3 + %lo(sparc64_kern_pri_context)], %g2
 707
 708         mov             PRIMARY_CONTEXT, %g1
 709
 710 661:    stxa            %g2, [%g1] ASI_DMMU
 711         .section        .sun4v_1insn_patch, "ax"
 712         .word           661b
 713         stxa            %g2, [%g1] ASI_MMU
 714         .previous
 715
 716         membar  #Sync
 717
 718         BRANCH_IF_SUN4V(o2, 1f)
 719
 720         /* Kill PROM timer */
 721         sethi   %hi(0x80000000), %o2
 722         sllx    %o2, 32, %o2
 723         wr      %o2, 0, %tick_cmpr
 724
 725         BRANCH_IF_ANY_CHEETAH(o2, o3, 1f)
 726
 727         ba,pt   %xcc, 2f
 728          nop
 729
 730         /* Disable STICK_INT interrupts. */
 731 1:
 732         sethi   %hi(0x80000000), %o2
 733         sllx    %o2, 32, %o2
 734         wr      %o2, %asr25
 735
 736 2:
 737         wrpr    %g0, %g0, %wstate
 738
 739         call    init_irqwork_curcpu
 740          nop
 741
 742         /* Now we can restore interrupt state. */
 743         wrpr    %l0, 0, %pstate
 744         wrpr    %l1, 0x0, %pil
 745
 746         ret
 747          restore
 748
 749         .globl  setup_tba
 750 setup_tba:
 751         save    %sp, -192, %sp
 752
 753         /* The boot processor is the only cpu which invokes this
 754          * routine, the other cpus set things up via trampoline.S.
 755          * So save the OBP trap table address here.
 756          */
 757         rdpr    %tba, %g7
 758         sethi   %hi(prom_tba), %o1
 759         or      %o1, %lo(prom_tba), %o1
 760         stx     %g7, [%o1]
 761
 762         call    setup_trap_table
 763          nop
 764
 765         ret
 766          restore
 767 sparc64_boot_end:
 768
 769 #include "etrap.S"
 770 #include "rtrap.S"
 771 #include "winfixup.S"
 772 #include "entry.S"
 773 #include "sun4v_tlb_miss.S"
 774 #include "sun4v_ivec.S"
 775 #include "ktlb.S"
 776 #include "tsb.S"
 777
 778 /*
 779  * The following skip makes sure the trap table in ttable.S is aligned
 780  * on a 32K boundary as required by the v9 specs for TBA register.
 781  *
 782  * We align to a 32K boundary, then we have the 32K kernel TSB,
 783  * the 64K kernel 4MB TSB, and then the 32K aligned trap table.
 784  */
 785 1:
 786         .skip   0x4000 + _start - 1b
 787
 788 ! 0x0000000000408000
 789
 790         .globl  swapper_tsb
 791 swapper_tsb:
 792         .skip   (32 * 1024)
 793
 794         .globl  swapper_4m_tsb
 795 swapper_4m_tsb:
 796         .skip   (64 * 1024)
 797
 798 ! 0x0000000000420000
 799
 800         /* Some care needs to be exercised if you try to move the
 801          * location of the trap table relative to other things.  For
 802          * one thing there are br* instructions in some of the
 803          * trap table entires which branch back to code in ktlb.S
 804          * Those instructions can only handle a signed 16-bit
 805          * displacement.
 806          *
 807          * There is a binutils bug (bugzilla #4558) which causes
 808          * the relocation overflow checks for such instructions to
 809          * not be done correctly.  So bintuils will not notice the
 810          * error and will instead write junk into the relocation and
 811          * you'll have an unbootable kernel.
 812          */
 813 #include "ttable.S"
 814
 815 ! 0x0000000000428000
 816
 817 #include "systbls.S"
 818
 819         .data
 820         .align  8
 821         .globl  prom_tba, tlb_type
 822 prom_tba:       .xword  0
 823 tlb_type:       .word   0       /* Must NOT end up in BSS */
 824         .section        ".fixup",#alloc,#execinstr
 825
 826         .globl  __ret_efault, __retl_efault
 827 __ret_efault:
 828         ret
 829          restore %g0, -EFAULT, %o0
 830 __retl_efault:
 831         retl
 832          mov    -EFAULT, %o0