1 /* head.S: Initial boot code for the Sparc64 port of Linux.
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)
9 #include <linux/version.h>
10 #include <linux/errno.h>
11 #include <linux/threads.h>
12 #include <linux/init.h>
13 #include <linux/linkage.h>
14 #include <asm/thread_info.h>
16 #include <asm/pstate.h>
17 #include <asm/ptrace.h>
18 #include <asm/spitfire.h>
20 #include <asm/pgtable.h>
21 #include <asm/errno.h>
22 #include <asm/signal.h>
23 #include <asm/processor.h>
28 #include <asm/ttable.h>
30 #include <asm/cpudata.h>
32 #include <asm/estate.h>
33 #include <asm/sfafsr.h>
34 #include <asm/unistd.h>
36 /* This section from from _start to sparc64_boot_end should fit into
37 * 0x0000000000404000 to 0x0000000000408000.
40 .globl start, _start, stext, _stext
47 flushw /* Flush register file. */
49 /* This stuff has to be in sync with SILO and other potential boot loaders
50 * Fields should be kept upward compatible and whenever any change is made,
51 * HdrS version should be incremented.
53 .global root_flags, ram_flags, root_dev
54 .global sparc_ramdisk_image, sparc_ramdisk_size
55 .global sparc_ramdisk_image64
58 .word LINUX_VERSION_CODE
62 * 0x0300 : Supports being located at other than 0x4000
63 * 0x0202 : Supports kernel params string
64 * 0x0201 : Supports reboot_command
66 .half 0x0301 /* HdrS version */
80 sparc_ramdisk_image64:
84 /* PROM cif handler code address is in %o4. */
88 /* We need to remap the kernel. Use position independant
89 * code to remap us to KERNBASE.
91 * SILO can invoke us with 32-bit address masking enabled,
92 * so make sure that's clear.
95 andn %g1, PSTATE_AM, %g1
96 wrpr %g1, 0x0, %pstate
99 .globl prom_finddev_name, prom_chosen_path, prom_root_node
100 .globl prom_getprop_name, prom_mmu_name, prom_peer_name
101 .globl prom_callmethod_name, prom_translate_name, prom_root_compatible
102 .globl prom_map_name, prom_unmap_name, prom_mmu_ihandle_cache
103 .globl prom_boot_mapped_pc, prom_boot_mapping_mode
104 .globl prom_boot_mapping_phys_high, prom_boot_mapping_phys_low
105 .globl prom_compatible_name, prom_cpu_path, prom_cpu_compatible
106 .globl is_sun4v, sun4v_chip_type, prom_set_trap_table_name
109 prom_compatible_name:
121 prom_callmethod_name:
129 prom_set_trap_table_name:
130 .asciz "SUNW,set-trap-table"
134 .asciz "SUNW,UltraSPARC-T"
136 prom_root_compatible:
142 prom_mmu_ihandle_cache:
146 prom_boot_mapping_mode:
149 prom_boot_mapping_phys_high:
151 prom_boot_mapping_phys_low:
156 .word SUN4V_CHIP_INVALID
160 mov (1b - prom_peer_name), %l1
164 /* prom_root_node = prom_peer(0) */
165 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "peer"
167 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
168 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
169 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, 0
170 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
172 add %sp, (2047 + 128), %o0 ! argument array
174 ldx [%sp + 2047 + 128 + 0x20], %l4 ! prom root node
175 mov (1b - prom_root_node), %l1
179 mov (1b - prom_getprop_name), %l1
180 mov (1b - prom_compatible_name), %l2
181 mov (1b - prom_root_compatible), %l5
186 /* prom_getproperty(prom_root_node, "compatible",
187 * &prom_root_compatible, 64)
189 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
191 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
193 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
194 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, prom_root_node
195 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "compatible"
196 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_root_compatible
198 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, size
199 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
201 add %sp, (2047 + 128), %o0 ! argument array
203 mov (1b - prom_finddev_name), %l1
204 mov (1b - prom_chosen_path), %l2
205 mov (1b - prom_boot_mapped_pc), %l3
210 sub %sp, (192 + 128), %sp
212 /* chosen_node = prom_finddevice("/chosen") */
213 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice"
215 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
216 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
217 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, "/chosen"
218 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
220 add %sp, (2047 + 128), %o0 ! argument array
222 ldx [%sp + 2047 + 128 + 0x20], %l4 ! chosen device node
224 mov (1b - prom_getprop_name), %l1
225 mov (1b - prom_mmu_name), %l2
226 mov (1b - prom_mmu_ihandle_cache), %l5
231 /* prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu") */
232 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
234 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
236 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
237 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, chosen_node
238 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "mmu"
239 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_mmu_ihandle_cache
241 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, sizeof(arg3)
242 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
244 add %sp, (2047 + 128), %o0 ! argument array
246 mov (1b - prom_callmethod_name), %l1
247 mov (1b - prom_translate_name), %l2
250 lduw [%l5], %l5 ! prom_mmu_ihandle_cache
252 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "call-method"
254 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 3
256 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 5
257 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1: "translate"
258 stx %l5, [%sp + 2047 + 128 + 0x20] ! arg2: prom_mmu_ihandle_cache
262 stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: vaddr, our PC
263 stx %g0, [%sp + 2047 + 128 + 0x30] ! res1
264 stx %g0, [%sp + 2047 + 128 + 0x38] ! res2
265 stx %g0, [%sp + 2047 + 128 + 0x40] ! res3
266 stx %g0, [%sp + 2047 + 128 + 0x48] ! res4
267 stx %g0, [%sp + 2047 + 128 + 0x50] ! res5
269 add %sp, (2047 + 128), %o0 ! argument array
271 ldx [%sp + 2047 + 128 + 0x40], %l1 ! translation mode
272 mov (1b - prom_boot_mapping_mode), %l4
275 mov (1b - prom_boot_mapping_phys_high), %l4
277 ldx [%sp + 2047 + 128 + 0x48], %l2 ! physaddr high
279 ldx [%sp + 2047 + 128 + 0x50], %l3 ! physaddr low
285 /* Leave service as-is, "call-method" */
287 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 7
289 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
290 mov (1b - prom_map_name), %l3
292 stx %l3, [%sp + 2047 + 128 + 0x18] ! arg1: "map"
293 /* Leave arg2 as-is, prom_mmu_ihandle_cache */
295 stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: mode (-1 default)
296 /* 4MB align the kernel image size. */
297 set (_end - KERNBASE), %l3
298 set ((4 * 1024 * 1024) - 1), %l4
301 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4: roundup(ksize, 4MB)
302 sethi %hi(KERNBASE), %l3
303 stx %l3, [%sp + 2047 + 128 + 0x38] ! arg5: vaddr (KERNBASE)
304 stx %g0, [%sp + 2047 + 128 + 0x40] ! arg6: empty
305 mov (1b - prom_boot_mapping_phys_low), %l3
308 stx %l3, [%sp + 2047 + 128 + 0x48] ! arg7: phys addr
310 add %sp, (2047 + 128), %o0 ! argument array
312 add %sp, (192 + 128), %sp
314 sethi %hi(prom_root_compatible), %g1
315 or %g1, %lo(prom_root_compatible), %g1
316 sethi %hi(prom_sun4v_name), %g7
317 or %g7, %lo(prom_sun4v_name), %g7
328 sethi %hi(is_sun4v), %g1
329 or %g1, %lo(is_sun4v), %g1
333 /* cpu_node = prom_finddevice("/cpu") */
334 mov (1b - prom_finddev_name), %l1
335 mov (1b - prom_cpu_path), %l2
338 sub %sp, (192 + 128), %sp
340 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice"
342 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
343 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
344 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, "/cpu"
345 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
347 add %sp, (2047 + 128), %o0 ! argument array
349 ldx [%sp + 2047 + 128 + 0x20], %l4 ! cpu device node
351 mov (1b - prom_getprop_name), %l1
352 mov (1b - prom_compatible_name), %l2
353 mov (1b - prom_cpu_compatible), %l5
358 /* prom_getproperty(cpu_node, "compatible",
359 * &prom_cpu_compatible, 64)
361 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
363 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
365 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
366 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, cpu_node
367 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "compatible"
368 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_cpu_compatible
370 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, size
371 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
373 add %sp, (2047 + 128), %o0 ! argument array
375 add %sp, (192 + 128), %sp
377 sethi %hi(prom_cpu_compatible), %g1
378 or %g1, %lo(prom_cpu_compatible), %g1
379 sethi %hi(prom_niagara_prefix), %g7
380 or %g7, %lo(prom_niagara_prefix), %g7
391 sethi %hi(prom_cpu_compatible), %g1
392 or %g1, %lo(prom_cpu_compatible), %g1
396 mov SUN4V_CHIP_NIAGARA1, %g4
399 mov SUN4V_CHIP_NIAGARA2, %g4
401 mov SUN4V_CHIP_UNKNOWN, %g4
402 5: sethi %hi(sun4v_chip_type), %g2
403 or %g2, %lo(sun4v_chip_type), %g2
407 BRANCH_IF_SUN4V(g1, jump_to_sun4u_init)
408 BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
409 BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
410 ba,pt %xcc, spitfire_boot
414 /* Preserve OBP chosen DCU and DCR register settings. */
415 ba,pt %xcc, cheetah_generic_boot
419 mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
422 sethi %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
423 or %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
425 or %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7
426 stxa %g7, [%g0] ASI_DCU_CONTROL_REG
429 cheetah_generic_boot:
430 mov TSB_EXTENSION_P, %g3
431 stxa %g0, [%g3] ASI_DMMU
432 stxa %g0, [%g3] ASI_IMMU
435 mov TSB_EXTENSION_S, %g3
436 stxa %g0, [%g3] ASI_DMMU
439 mov TSB_EXTENSION_N, %g3
440 stxa %g0, [%g3] ASI_DMMU
441 stxa %g0, [%g3] ASI_IMMU
444 ba,a,pt %xcc, jump_to_sun4u_init
447 /* Typically PROM has already enabled both MMU's and both on-chip
448 * caches, but we do it here anyway just to be paranoid.
450 mov (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1
451 stxa %g1, [%g0] ASI_LSU_CONTROL
456 * Make sure we are in privileged mode, have address masking,
457 * using the ordinary globals and have enabled floating
460 * Again, typically PROM has left %pil at 13 or similar, and
461 * (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate.
463 wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
470 .section .text.init.refok
472 BRANCH_IF_SUN4V(g1, sun4v_init)
475 mov PRIMARY_CONTEXT, %g7
476 stxa %g0, [%g7] ASI_DMMU
479 mov SECONDARY_CONTEXT, %g7
480 stxa %g0, [%g7] ASI_DMMU
483 ba,pt %xcc, sun4u_continue
488 mov PRIMARY_CONTEXT, %g7
489 stxa %g0, [%g7] ASI_MMU
492 mov SECONDARY_CONTEXT, %g7
493 stxa %g0, [%g7] ASI_MMU
495 ba,pt %xcc, niagara_tlb_fixup
499 BRANCH_IF_ANY_CHEETAH(g1, g7, cheetah_tlb_fixup)
501 ba,pt %xcc, spitfire_tlb_fixup
505 mov 3, %g2 /* Set TLB type to hypervisor. */
506 sethi %hi(tlb_type), %g1
507 stw %g2, [%g1 + %lo(tlb_type)]
509 /* Patch copy/clear ops. */
510 sethi %hi(sun4v_chip_type), %g1
511 lduw [%g1 + %lo(sun4v_chip_type)], %g1
512 cmp %g1, SUN4V_CHIP_NIAGARA1
513 be,pt %xcc, niagara_patch
514 cmp %g1, SUN4V_CHIP_NIAGARA2
515 be,pt %xcc, niagara2_patch
518 call generic_patch_copyops
520 call generic_patch_bzero
522 call generic_patch_pageops
527 call niagara2_patch_copyops
529 call niagara_patch_bzero
531 call niagara2_patch_pageops
537 call niagara_patch_copyops
539 call niagara_patch_bzero
541 call niagara_patch_pageops
545 /* Patch TLB/cache ops. */
546 call hypervisor_patch_cachetlbops
549 ba,pt %xcc, tlb_fixup_done
553 mov 2, %g2 /* Set TLB type to cheetah+. */
554 BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
556 mov 1, %g2 /* Set TLB type to cheetah. */
558 1: sethi %hi(tlb_type), %g1
559 stw %g2, [%g1 + %lo(tlb_type)]
561 /* Patch copy/page operations to cheetah optimized versions. */
562 call cheetah_patch_copyops
564 call cheetah_patch_copy_page
566 call cheetah_patch_cachetlbops
569 ba,pt %xcc, tlb_fixup_done
573 /* Set TLB type to spitfire. */
575 sethi %hi(tlb_type), %g1
576 stw %g2, [%g1 + %lo(tlb_type)]
579 sethi %hi(init_thread_union), %g6
580 or %g6, %lo(init_thread_union), %g6
581 ldx [%g6 + TI_TASK], %g4
586 sllx %g1, THREAD_SHIFT, %g1
587 sub %g1, (STACKFRAME_SZ + STACK_BIAS), %g1
591 /* Set per-cpu pointer initially to zero, this makes
592 * the boot-cpu use the in-kernel-image per-cpu areas
593 * before setup_per_cpu_area() is invoked.
601 sethi %hi(__bss_start), %o0
602 or %o0, %lo(__bss_start), %o0
604 or %o1, %lo(_end), %o1
608 #ifdef CONFIG_LOCKDEP
609 /* We have this call this super early, as even prom_init can grab
610 * spinlocks and thus call into the lockdep code.
616 mov %l6, %o1 ! OpenPROM stack
618 mov %l7, %o0 ! OpenPROM cif handler
620 /* Initialize current_thread_info()->cpu as early as possible.
621 * In order to do that accurately we have to patch up the get_cpuid()
622 * assembler sequences. And that, in turn, requires that we know
623 * if we are on a Starfire box or not. While we're here, patch up
624 * the sun4v sequences as well.
626 call check_if_starfire
634 call hard_smp_processor_id
639 call boot_cpu_id_too_large
644 /* If we boot on a non-zero cpu, all of the per-cpu
645 * variable references we make before setting up the
646 * per-cpu areas will use a bogus offset. Put a
647 * compensating factor into __per_cpu_base to handle
650 * What the per-cpu code calculates is:
652 * __per_cpu_base + (cpu << __per_cpu_shift)
654 * These two variables are zero initially, so to
655 * make it all cancel out to zero we need to put
656 * "0 - (cpu << 0)" into __per_cpu_base so that the
657 * above formula evaluates to zero.
659 * We cannot even perform a printk() until this stuff
660 * is setup as that calls cpu_clock() which uses
664 sethi %hi(__per_cpu_base), %o2
665 stx %o1, [%o2 + %lo(__per_cpu_base)]
669 sth %o0, [%g6 + TI_CPU]
671 call prom_init_report
681 /* This is meant to allow the sharing of this code between
682 * boot processor invocation (via setup_tba() below) and
683 * secondary processor startup (via trampoline.S). The
684 * former does use this code, the latter does not yet due
685 * to some complexities. That should be fixed up at some
688 * There used to be enormous complexity wrt. transferring
689 * over from the firwmare's trap table to the Linux kernel's.
690 * For example, there was a chicken & egg problem wrt. building
691 * the OBP page tables, yet needing to be on the Linux kernel
692 * trap table (to translate PAGE_OFFSET addresses) in order to
695 * We now handle OBP tlb misses differently, via linear lookups
696 * into the prom_trans[] array. So that specific problem no
697 * longer exists. Yet, unfortunately there are still some issues
698 * preventing trampoline.S from using this code... ho hum.
700 .globl setup_trap_table
704 /* Force interrupts to be disabled. */
706 andn %l0, PSTATE_IE, %o1
707 wrpr %o1, 0x0, %pstate
709 wrpr %g0, PIL_NORMAL_MAX, %pil
711 /* Make the firmware call to jump over to the Linux trap table. */
712 sethi %hi(is_sun4v), %o0
713 lduw [%o0 + %lo(is_sun4v)], %o0
717 TRAP_LOAD_TRAP_BLOCK(%g2, %g3)
718 add %g2, TRAP_PER_CPU_FAULT_INFO, %g2
719 stxa %g2, [%g0] ASI_SCRATCHPAD
721 /* Compute physical address:
723 * paddr = kern_base + (mmfsa_vaddr - KERNBASE)
725 sethi %hi(KERNBASE), %g3
727 sethi %hi(kern_base), %g3
728 ldx [%g3 + %lo(kern_base)], %g3
730 sethi %hi(sparc64_ttable_tl0), %o0
732 set prom_set_trap_table_name, %g2
733 stx %g2, [%sp + 2047 + 128 + 0x00]
735 stx %g2, [%sp + 2047 + 128 + 0x08]
737 stx %g2, [%sp + 2047 + 128 + 0x10]
738 stx %o0, [%sp + 2047 + 128 + 0x18]
739 stx %o1, [%sp + 2047 + 128 + 0x20]
740 sethi %hi(p1275buf), %g2
741 or %g2, %lo(p1275buf), %g2
742 ldx [%g2 + 0x08], %o1
744 add %sp, (2047 + 128), %o0
749 1: sethi %hi(sparc64_ttable_tl0), %o0
750 set prom_set_trap_table_name, %g2
751 stx %g2, [%sp + 2047 + 128 + 0x00]
753 stx %g2, [%sp + 2047 + 128 + 0x08]
755 stx %g2, [%sp + 2047 + 128 + 0x10]
756 stx %o0, [%sp + 2047 + 128 + 0x18]
757 sethi %hi(p1275buf), %g2
758 or %g2, %lo(p1275buf), %g2
759 ldx [%g2 + 0x08], %o1
761 add %sp, (2047 + 128), %o0
763 /* Start using proper page size encodings in ctx register. */
764 2: sethi %hi(sparc64_kern_pri_context), %g3
765 ldx [%g3 + %lo(sparc64_kern_pri_context)], %g2
767 mov PRIMARY_CONTEXT, %g1
769 661: stxa %g2, [%g1] ASI_DMMU
770 .section .sun4v_1insn_patch, "ax"
772 stxa %g2, [%g1] ASI_MMU
777 BRANCH_IF_SUN4V(o2, 1f)
779 /* Kill PROM timer */
780 sethi %hi(0x80000000), %o2
782 wr %o2, 0, %tick_cmpr
784 BRANCH_IF_ANY_CHEETAH(o2, o3, 1f)
789 /* Disable STICK_INT interrupts. */
791 sethi %hi(0x80000000), %o2
796 wrpr %g0, %g0, %wstate
798 call init_irqwork_curcpu
801 /* Now we can restore interrupt state. */
812 /* The boot processor is the only cpu which invokes this
813 * routine, the other cpus set things up via trampoline.S.
814 * So save the OBP trap table address here.
817 sethi %hi(prom_tba), %o1
818 or %o1, %lo(prom_tba), %o1
821 call setup_trap_table
828 #include "etrap_64.S"
829 #include "rtrap_64.S"
830 #include "winfixup.S"
831 #include "fpu_traps.S"
833 #include "getsetcc.S"
835 #include "spiterrs.S"
837 #include "misctrap.S"
838 #include "syscalls.S"
841 #include "sun4v_tlb_miss.S"
842 #include "sun4v_ivec.S"
847 * The following skip makes sure the trap table in ttable.S is aligned
848 * on a 32K boundary as required by the v9 specs for TBA register.
850 * We align to a 32K boundary, then we have the 32K kernel TSB,
851 * the 64K kernel 4MB TSB, and then the 32K aligned trap table.
854 .skip 0x4000 + _start - 1b
862 .globl swapper_4m_tsb
868 /* Some care needs to be exercised if you try to move the
869 * location of the trap table relative to other things. For
870 * one thing there are br* instructions in some of the
871 * trap table entires which branch back to code in ktlb.S
872 * Those instructions can only handle a signed 16-bit
875 * There is a binutils bug (bugzilla #4558) which causes
876 * the relocation overflow checks for such instructions to
877 * not be done correctly. So bintuils will not notice the
878 * error and will instead write junk into the relocation and
879 * you'll have an unbootable kernel.
885 #include "systbls_64.S"
889 .globl prom_tba, tlb_type
891 tlb_type: .word 0 /* Must NOT end up in BSS */
892 .section ".fixup",#alloc,#execinstr
894 .globl __ret_efault, __retl_efault
897 restore %g0, -EFAULT, %o0