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 independent
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"
138 prom_root_compatible:
144 prom_mmu_ihandle_cache:
148 prom_boot_mapping_mode:
151 prom_boot_mapping_phys_high:
153 prom_boot_mapping_phys_low:
158 .word SUN4V_CHIP_INVALID
162 mov (1b - prom_peer_name), %l1
166 /* prom_root_node = prom_peer(0) */
167 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "peer"
169 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
170 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
171 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, 0
172 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
174 add %sp, (2047 + 128), %o0 ! argument array
176 ldx [%sp + 2047 + 128 + 0x20], %l4 ! prom root node
177 mov (1b - prom_root_node), %l1
181 mov (1b - prom_getprop_name), %l1
182 mov (1b - prom_compatible_name), %l2
183 mov (1b - prom_root_compatible), %l5
188 /* prom_getproperty(prom_root_node, "compatible",
189 * &prom_root_compatible, 64)
191 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
193 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
195 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
196 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, prom_root_node
197 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "compatible"
198 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_root_compatible
200 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, size
201 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
203 add %sp, (2047 + 128), %o0 ! argument array
205 mov (1b - prom_finddev_name), %l1
206 mov (1b - prom_chosen_path), %l2
207 mov (1b - prom_boot_mapped_pc), %l3
212 sub %sp, (192 + 128), %sp
214 /* chosen_node = prom_finddevice("/chosen") */
215 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice"
217 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
218 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
219 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, "/chosen"
220 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
222 add %sp, (2047 + 128), %o0 ! argument array
224 ldx [%sp + 2047 + 128 + 0x20], %l4 ! chosen device node
226 mov (1b - prom_getprop_name), %l1
227 mov (1b - prom_mmu_name), %l2
228 mov (1b - prom_mmu_ihandle_cache), %l5
233 /* prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu") */
234 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
236 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
238 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
239 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, chosen_node
240 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "mmu"
241 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_mmu_ihandle_cache
243 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, sizeof(arg3)
244 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
246 add %sp, (2047 + 128), %o0 ! argument array
248 mov (1b - prom_callmethod_name), %l1
249 mov (1b - prom_translate_name), %l2
252 lduw [%l5], %l5 ! prom_mmu_ihandle_cache
254 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "call-method"
256 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 3
258 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 5
259 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1: "translate"
260 stx %l5, [%sp + 2047 + 128 + 0x20] ! arg2: prom_mmu_ihandle_cache
264 stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: vaddr, our PC
265 stx %g0, [%sp + 2047 + 128 + 0x30] ! res1
266 stx %g0, [%sp + 2047 + 128 + 0x38] ! res2
267 stx %g0, [%sp + 2047 + 128 + 0x40] ! res3
268 stx %g0, [%sp + 2047 + 128 + 0x48] ! res4
269 stx %g0, [%sp + 2047 + 128 + 0x50] ! res5
271 add %sp, (2047 + 128), %o0 ! argument array
273 ldx [%sp + 2047 + 128 + 0x40], %l1 ! translation mode
274 mov (1b - prom_boot_mapping_mode), %l4
277 mov (1b - prom_boot_mapping_phys_high), %l4
279 ldx [%sp + 2047 + 128 + 0x48], %l2 ! physaddr high
281 ldx [%sp + 2047 + 128 + 0x50], %l3 ! physaddr low
287 /* Leave service as-is, "call-method" */
289 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 7
291 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
292 mov (1b - prom_map_name), %l3
294 stx %l3, [%sp + 2047 + 128 + 0x18] ! arg1: "map"
295 /* Leave arg2 as-is, prom_mmu_ihandle_cache */
297 stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: mode (-1 default)
298 /* 4MB align the kernel image size. */
299 set (_end - KERNBASE), %l3
300 set ((4 * 1024 * 1024) - 1), %l4
303 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4: roundup(ksize, 4MB)
304 sethi %hi(KERNBASE), %l3
305 stx %l3, [%sp + 2047 + 128 + 0x38] ! arg5: vaddr (KERNBASE)
306 stx %g0, [%sp + 2047 + 128 + 0x40] ! arg6: empty
307 mov (1b - prom_boot_mapping_phys_low), %l3
310 stx %l3, [%sp + 2047 + 128 + 0x48] ! arg7: phys addr
312 add %sp, (2047 + 128), %o0 ! argument array
314 add %sp, (192 + 128), %sp
316 sethi %hi(prom_root_compatible), %g1
317 or %g1, %lo(prom_root_compatible), %g1
318 sethi %hi(prom_sun4v_name), %g7
319 or %g7, %lo(prom_sun4v_name), %g7
330 sethi %hi(is_sun4v), %g1
331 or %g1, %lo(is_sun4v), %g1
335 /* cpu_node = prom_finddevice("/cpu") */
336 mov (1b - prom_finddev_name), %l1
337 mov (1b - prom_cpu_path), %l2
340 sub %sp, (192 + 128), %sp
342 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice"
344 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
345 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
346 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, "/cpu"
347 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
349 add %sp, (2047 + 128), %o0 ! argument array
351 ldx [%sp + 2047 + 128 + 0x20], %l4 ! cpu device node
353 mov (1b - prom_getprop_name), %l1
354 mov (1b - prom_compatible_name), %l2
355 mov (1b - prom_cpu_compatible), %l5
360 /* prom_getproperty(cpu_node, "compatible",
361 * &prom_cpu_compatible, 64)
363 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
365 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
367 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
368 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, cpu_node
369 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "compatible"
370 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_cpu_compatible
372 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, size
373 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
375 add %sp, (2047 + 128), %o0 ! argument array
377 add %sp, (192 + 128), %sp
379 sethi %hi(prom_cpu_compatible), %g1
380 or %g1, %lo(prom_cpu_compatible), %g1
381 sethi %hi(prom_niagara_prefix), %g7
382 or %g7, %lo(prom_niagara_prefix), %g7
395 89: sethi %hi(prom_cpu_compatible), %g1
396 or %g1, %lo(prom_cpu_compatible), %g1
397 sethi %hi(prom_sparc_prefix), %g7
398 or %g7, %lo(prom_sparc_prefix), %g7
409 sethi %hi(prom_cpu_compatible), %g1
410 or %g1, %lo(prom_cpu_compatible), %g1
418 70: ldub [%g1 + 7], %g2
421 mov SUN4V_CHIP_NIAGARA3, %g4
424 mov SUN4V_CHIP_NIAGARA4, %g4
427 mov SUN4V_CHIP_NIAGARA5, %g4
431 91: sethi %hi(prom_cpu_compatible), %g1
432 or %g1, %lo(prom_cpu_compatible), %g1
436 mov SUN4V_CHIP_NIAGARA1, %g4
439 mov SUN4V_CHIP_NIAGARA2, %g4
442 mov SUN4V_CHIP_UNKNOWN, %g4
443 5: sethi %hi(sun4v_chip_type), %g2
444 or %g2, %lo(sun4v_chip_type), %g2
448 BRANCH_IF_SUN4V(g1, jump_to_sun4u_init)
449 BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
450 BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
451 ba,pt %xcc, spitfire_boot
455 /* Preserve OBP chosen DCU and DCR register settings. */
456 ba,pt %xcc, cheetah_generic_boot
460 mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
463 sethi %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
464 or %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
466 or %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7
467 stxa %g7, [%g0] ASI_DCU_CONTROL_REG
470 cheetah_generic_boot:
471 mov TSB_EXTENSION_P, %g3
472 stxa %g0, [%g3] ASI_DMMU
473 stxa %g0, [%g3] ASI_IMMU
476 mov TSB_EXTENSION_S, %g3
477 stxa %g0, [%g3] ASI_DMMU
480 mov TSB_EXTENSION_N, %g3
481 stxa %g0, [%g3] ASI_DMMU
482 stxa %g0, [%g3] ASI_IMMU
485 ba,a,pt %xcc, jump_to_sun4u_init
488 /* Typically PROM has already enabled both MMU's and both on-chip
489 * caches, but we do it here anyway just to be paranoid.
491 mov (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1
492 stxa %g1, [%g0] ASI_LSU_CONTROL
497 * Make sure we are in privileged mode, have address masking,
498 * using the ordinary globals and have enabled floating
501 * Again, typically PROM has left %pil at 13 or similar, and
502 * (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate.
504 wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
513 BRANCH_IF_SUN4V(g1, sun4v_init)
516 mov PRIMARY_CONTEXT, %g7
517 stxa %g0, [%g7] ASI_DMMU
520 mov SECONDARY_CONTEXT, %g7
521 stxa %g0, [%g7] ASI_DMMU
524 ba,pt %xcc, sun4u_continue
529 mov PRIMARY_CONTEXT, %g7
530 stxa %g0, [%g7] ASI_MMU
533 mov SECONDARY_CONTEXT, %g7
534 stxa %g0, [%g7] ASI_MMU
536 ba,pt %xcc, niagara_tlb_fixup
540 BRANCH_IF_ANY_CHEETAH(g1, g7, cheetah_tlb_fixup)
542 ba,pt %xcc, spitfire_tlb_fixup
546 mov 3, %g2 /* Set TLB type to hypervisor. */
547 sethi %hi(tlb_type), %g1
548 stw %g2, [%g1 + %lo(tlb_type)]
550 /* Patch copy/clear ops. */
551 sethi %hi(sun4v_chip_type), %g1
552 lduw [%g1 + %lo(sun4v_chip_type)], %g1
553 cmp %g1, SUN4V_CHIP_NIAGARA1
554 be,pt %xcc, niagara_patch
555 cmp %g1, SUN4V_CHIP_NIAGARA2
556 be,pt %xcc, niagara2_patch
558 cmp %g1, SUN4V_CHIP_NIAGARA3
559 be,pt %xcc, niagara2_patch
561 cmp %g1, SUN4V_CHIP_NIAGARA4
562 be,pt %xcc, niagara4_patch
564 cmp %g1, SUN4V_CHIP_NIAGARA5
565 be,pt %xcc, niagara4_patch
568 call generic_patch_copyops
570 call generic_patch_bzero
572 call generic_patch_pageops
577 call niagara4_patch_copyops
579 call niagara4_patch_bzero
581 call niagara4_patch_pageops
587 call niagara2_patch_copyops
589 call niagara_patch_bzero
591 call niagara_patch_pageops
597 call niagara_patch_copyops
599 call niagara_patch_bzero
601 call niagara_patch_pageops
605 /* Patch TLB/cache ops. */
606 call hypervisor_patch_cachetlbops
609 ba,pt %xcc, tlb_fixup_done
613 mov 2, %g2 /* Set TLB type to cheetah+. */
614 BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
616 mov 1, %g2 /* Set TLB type to cheetah. */
618 1: sethi %hi(tlb_type), %g1
619 stw %g2, [%g1 + %lo(tlb_type)]
621 /* Patch copy/page operations to cheetah optimized versions. */
622 call cheetah_patch_copyops
624 call cheetah_patch_copy_page
626 call cheetah_patch_cachetlbops
629 ba,pt %xcc, tlb_fixup_done
633 /* Set TLB type to spitfire. */
635 sethi %hi(tlb_type), %g1
636 stw %g2, [%g1 + %lo(tlb_type)]
639 sethi %hi(init_thread_union), %g6
640 or %g6, %lo(init_thread_union), %g6
641 ldx [%g6 + TI_TASK], %g4
646 sllx %g1, THREAD_SHIFT, %g1
647 sub %g1, (STACKFRAME_SZ + STACK_BIAS), %g1
651 /* Set per-cpu pointer initially to zero, this makes
652 * the boot-cpu use the in-kernel-image per-cpu areas
653 * before setup_per_cpu_area() is invoked.
661 sethi %hi(__bss_start), %o0
662 or %o0, %lo(__bss_start), %o0
664 or %o1, %lo(_end), %o1
668 #ifdef CONFIG_LOCKDEP
669 /* We have this call this super early, as even prom_init can grab
670 * spinlocks and thus call into the lockdep code.
676 mov %l6, %o1 ! OpenPROM stack
678 mov %l7, %o0 ! OpenPROM cif handler
680 /* Initialize current_thread_info()->cpu as early as possible.
681 * In order to do that accurately we have to patch up the get_cpuid()
682 * assembler sequences. And that, in turn, requires that we know
683 * if we are on a Starfire box or not. While we're here, patch up
684 * the sun4v sequences as well.
686 call check_if_starfire
694 call hard_smp_processor_id
699 call boot_cpu_id_too_large
707 sth %o0, [%g6 + TI_CPU]
709 call prom_init_report
719 /* This is meant to allow the sharing of this code between
720 * boot processor invocation (via setup_tba() below) and
721 * secondary processor startup (via trampoline.S). The
722 * former does use this code, the latter does not yet due
723 * to some complexities. That should be fixed up at some
726 * There used to be enormous complexity wrt. transferring
727 * over from the firmware's trap table to the Linux kernel's.
728 * For example, there was a chicken & egg problem wrt. building
729 * the OBP page tables, yet needing to be on the Linux kernel
730 * trap table (to translate PAGE_OFFSET addresses) in order to
733 * We now handle OBP tlb misses differently, via linear lookups
734 * into the prom_trans[] array. So that specific problem no
735 * longer exists. Yet, unfortunately there are still some issues
736 * preventing trampoline.S from using this code... ho hum.
738 .globl setup_trap_table
742 /* Force interrupts to be disabled. */
744 andn %l0, PSTATE_IE, %o1
745 wrpr %o1, 0x0, %pstate
747 wrpr %g0, PIL_NORMAL_MAX, %pil
749 /* Make the firmware call to jump over to the Linux trap table. */
750 sethi %hi(is_sun4v), %o0
751 lduw [%o0 + %lo(is_sun4v)], %o0
755 TRAP_LOAD_TRAP_BLOCK(%g2, %g3)
756 add %g2, TRAP_PER_CPU_FAULT_INFO, %g2
757 stxa %g2, [%g0] ASI_SCRATCHPAD
759 /* Compute physical address:
761 * paddr = kern_base + (mmfsa_vaddr - KERNBASE)
763 sethi %hi(KERNBASE), %g3
765 sethi %hi(kern_base), %g3
766 ldx [%g3 + %lo(kern_base)], %g3
768 sethi %hi(sparc64_ttable_tl0), %o0
770 set prom_set_trap_table_name, %g2
771 stx %g2, [%sp + 2047 + 128 + 0x00]
773 stx %g2, [%sp + 2047 + 128 + 0x08]
775 stx %g2, [%sp + 2047 + 128 + 0x10]
776 stx %o0, [%sp + 2047 + 128 + 0x18]
777 stx %o1, [%sp + 2047 + 128 + 0x20]
778 sethi %hi(p1275buf), %g2
779 or %g2, %lo(p1275buf), %g2
780 ldx [%g2 + 0x08], %o1
782 add %sp, (2047 + 128), %o0
787 1: sethi %hi(sparc64_ttable_tl0), %o0
788 set prom_set_trap_table_name, %g2
789 stx %g2, [%sp + 2047 + 128 + 0x00]
791 stx %g2, [%sp + 2047 + 128 + 0x08]
793 stx %g2, [%sp + 2047 + 128 + 0x10]
794 stx %o0, [%sp + 2047 + 128 + 0x18]
795 sethi %hi(p1275buf), %g2
796 or %g2, %lo(p1275buf), %g2
797 ldx [%g2 + 0x08], %o1
799 add %sp, (2047 + 128), %o0
801 /* Start using proper page size encodings in ctx register. */
802 2: sethi %hi(sparc64_kern_pri_context), %g3
803 ldx [%g3 + %lo(sparc64_kern_pri_context)], %g2
805 mov PRIMARY_CONTEXT, %g1
807 661: stxa %g2, [%g1] ASI_DMMU
808 .section .sun4v_1insn_patch, "ax"
810 stxa %g2, [%g1] ASI_MMU
815 BRANCH_IF_SUN4V(o2, 1f)
817 /* Kill PROM timer */
818 sethi %hi(0x80000000), %o2
820 wr %o2, 0, %tick_cmpr
822 BRANCH_IF_ANY_CHEETAH(o2, o3, 1f)
827 /* Disable STICK_INT interrupts. */
829 sethi %hi(0x80000000), %o2
834 wrpr %g0, %g0, %wstate
836 call init_irqwork_curcpu
839 /* Now we can restore interrupt state. */
850 /* The boot processor is the only cpu which invokes this
851 * routine, the other cpus set things up via trampoline.S.
852 * So save the OBP trap table address here.
855 sethi %hi(prom_tba), %o1
856 or %o1, %lo(prom_tba), %o1
859 call setup_trap_table
866 #include "etrap_64.S"
867 #include "rtrap_64.S"
868 #include "winfixup.S"
869 #include "fpu_traps.S"
871 #include "getsetcc.S"
873 #include "spiterrs.S"
875 #include "misctrap.S"
876 #include "syscalls.S"
879 #include "sun4v_tlb_miss.S"
880 #include "sun4v_ivec.S"
885 * The following skip makes sure the trap table in ttable.S is aligned
886 * on a 32K boundary as required by the v9 specs for TBA register.
888 * We align to a 32K boundary, then we have the 32K kernel TSB,
889 * the 64K kernel 4MB TSB, and then the 32K aligned trap table.
892 .skip 0x4000 + _start - 1b
900 .globl swapper_4m_tsb
906 /* Some care needs to be exercised if you try to move the
907 * location of the trap table relative to other things. For
908 * one thing there are br* instructions in some of the
909 * trap table entires which branch back to code in ktlb.S
910 * Those instructions can only handle a signed 16-bit
913 * There is a binutils bug (bugzilla #4558) which causes
914 * the relocation overflow checks for such instructions to
915 * not be done correctly. So bintuils will not notice the
916 * error and will instead write junk into the relocation and
917 * you'll have an unbootable kernel.
919 #include "ttable_64.S"
923 #include "systbls_64.S"
927 .globl prom_tba, tlb_type
929 tlb_type: .word 0 /* Must NOT end up in BSS */
930 .section ".fixup",#alloc,#execinstr
932 .globl __ret_efault, __retl_efault, __ret_one, __retl_one
935 restore %g0, -EFAULT, %o0
936 ENDPROC(__ret_efault)
941 ENDPROC(__retl_efault)
949 wr %g0, ASI_AIUS, %asi
952 ENDPROC(__ret_one_asi)
954 ENTRY(__retl_one_asi)
955 wr %g0, ASI_AIUS, %asi
958 ENDPROC(__retl_one_asi)