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 <asm/thread_info.h>
15 #include <asm/pstate.h>
16 #include <asm/ptrace.h>
17 #include <asm/spitfire.h>
19 #include <asm/pgtable.h>
20 #include <asm/errno.h>
21 #include <asm/signal.h>
22 #include <asm/processor.h>
27 #include <asm/ttable.h>
29 #include <asm/cpudata.h>
31 /* This section from from _start to sparc64_boot_end should fit into
32 * 0x0000000000404000 to 0x0000000000408000.
35 .globl start, _start, stext, _stext
42 flushw /* Flush register file. */
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.
48 .global root_flags, ram_flags, root_dev
49 .global sparc_ramdisk_image, sparc_ramdisk_size
50 .global sparc_ramdisk_image64
53 .word LINUX_VERSION_CODE
57 * 0x0300 : Supports being located at other than 0x4000
58 * 0x0202 : Supports kernel params string
59 * 0x0201 : Supports reboot_command
61 .half 0x0301 /* HdrS version */
75 sparc_ramdisk_image64:
79 /* PROM cif handler code address is in %o4. */
83 /* We need to remap the kernel. Use position independant
84 * code to remap us to KERNBASE.
86 * SILO can invoke us with 32-bit address masking enabled,
87 * so make sure that's clear.
90 andn %g1, PSTATE_AM, %g1
91 wrpr %g1, 0x0, %pstate
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, prom_set_trap_table_name
104 prom_compatible_name:
116 prom_callmethod_name:
124 prom_set_trap_table_name:
125 .asciz "SUNW,set-trap-table"
129 .asciz "SUNW,UltraSPARC-T"
131 prom_root_compatible:
137 prom_mmu_ihandle_cache:
141 prom_boot_mapping_mode:
144 prom_boot_mapping_phys_high:
146 prom_boot_mapping_phys_low:
151 .word SUN4V_CHIP_INVALID
155 mov (1b - prom_peer_name), %l1
159 /* prom_root_node = prom_peer(0) */
160 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "peer"
162 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
163 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
164 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, 0
165 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
167 add %sp, (2047 + 128), %o0 ! argument array
169 ldx [%sp + 2047 + 128 + 0x20], %l4 ! prom root node
170 mov (1b - prom_root_node), %l1
174 mov (1b - prom_getprop_name), %l1
175 mov (1b - prom_compatible_name), %l2
176 mov (1b - prom_root_compatible), %l5
181 /* prom_getproperty(prom_root_node, "compatible",
182 * &prom_root_compatible, 64)
184 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
186 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
188 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
189 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, prom_root_node
190 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "compatible"
191 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_root_compatible
193 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, size
194 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
196 add %sp, (2047 + 128), %o0 ! argument array
198 mov (1b - prom_finddev_name), %l1
199 mov (1b - prom_chosen_path), %l2
200 mov (1b - prom_boot_mapped_pc), %l3
205 sub %sp, (192 + 128), %sp
207 /* chosen_node = prom_finddevice("/chosen") */
208 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice"
210 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
211 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
212 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, "/chosen"
213 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
215 add %sp, (2047 + 128), %o0 ! argument array
217 ldx [%sp + 2047 + 128 + 0x20], %l4 ! chosen device node
219 mov (1b - prom_getprop_name), %l1
220 mov (1b - prom_mmu_name), %l2
221 mov (1b - prom_mmu_ihandle_cache), %l5
226 /* prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu") */
227 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
229 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
231 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
232 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, chosen_node
233 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "mmu"
234 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_mmu_ihandle_cache
236 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, sizeof(arg3)
237 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
239 add %sp, (2047 + 128), %o0 ! argument array
241 mov (1b - prom_callmethod_name), %l1
242 mov (1b - prom_translate_name), %l2
245 lduw [%l5], %l5 ! prom_mmu_ihandle_cache
247 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "call-method"
249 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 3
251 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 5
252 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1: "translate"
253 stx %l5, [%sp + 2047 + 128 + 0x20] ! arg2: prom_mmu_ihandle_cache
257 stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: vaddr, our PC
258 stx %g0, [%sp + 2047 + 128 + 0x30] ! res1
259 stx %g0, [%sp + 2047 + 128 + 0x38] ! res2
260 stx %g0, [%sp + 2047 + 128 + 0x40] ! res3
261 stx %g0, [%sp + 2047 + 128 + 0x48] ! res4
262 stx %g0, [%sp + 2047 + 128 + 0x50] ! res5
264 add %sp, (2047 + 128), %o0 ! argument array
266 ldx [%sp + 2047 + 128 + 0x40], %l1 ! translation mode
267 mov (1b - prom_boot_mapping_mode), %l4
270 mov (1b - prom_boot_mapping_phys_high), %l4
272 ldx [%sp + 2047 + 128 + 0x48], %l2 ! physaddr high
274 ldx [%sp + 2047 + 128 + 0x50], %l3 ! physaddr low
280 /* Leave service as-is, "call-method" */
282 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 7
284 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
285 mov (1b - prom_map_name), %l3
287 stx %l3, [%sp + 2047 + 128 + 0x18] ! arg1: "map"
288 /* Leave arg2 as-is, prom_mmu_ihandle_cache */
290 stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: mode (-1 default)
291 sethi %hi(8 * 1024 * 1024), %l3
292 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4: size (8MB)
293 sethi %hi(KERNBASE), %l3
294 stx %l3, [%sp + 2047 + 128 + 0x38] ! arg5: vaddr (KERNBASE)
295 stx %g0, [%sp + 2047 + 128 + 0x40] ! arg6: empty
296 mov (1b - prom_boot_mapping_phys_low), %l3
299 stx %l3, [%sp + 2047 + 128 + 0x48] ! arg7: phys addr
301 add %sp, (2047 + 128), %o0 ! argument array
303 add %sp, (192 + 128), %sp
305 sethi %hi(prom_root_compatible), %g1
306 or %g1, %lo(prom_root_compatible), %g1
307 sethi %hi(prom_sun4v_name), %g7
308 or %g7, %lo(prom_sun4v_name), %g7
319 sethi %hi(is_sun4v), %g1
320 or %g1, %lo(is_sun4v), %g1
324 /* cpu_node = prom_finddevice("/cpu") */
325 mov (1b - prom_finddev_name), %l1
326 mov (1b - prom_cpu_path), %l2
329 sub %sp, (192 + 128), %sp
331 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice"
333 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
334 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
335 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, "/cpu"
336 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
338 add %sp, (2047 + 128), %o0 ! argument array
340 ldx [%sp + 2047 + 128 + 0x20], %l4 ! cpu device node
342 mov (1b - prom_getprop_name), %l1
343 mov (1b - prom_compatible_name), %l2
344 mov (1b - prom_cpu_compatible), %l5
349 /* prom_getproperty(cpu_node, "compatible",
350 * &prom_cpu_compatible, 64)
352 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
354 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
356 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
357 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, cpu_node
358 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "compatible"
359 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_cpu_compatible
361 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, size
362 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
364 add %sp, (2047 + 128), %o0 ! argument array
366 add %sp, (192 + 128), %sp
368 sethi %hi(prom_cpu_compatible), %g1
369 or %g1, %lo(prom_cpu_compatible), %g1
370 sethi %hi(prom_niagara_prefix), %g7
371 or %g7, %lo(prom_niagara_prefix), %g7
382 sethi %hi(prom_cpu_compatible), %g1
383 or %g1, %lo(prom_cpu_compatible), %g1
387 mov SUN4V_CHIP_NIAGARA1, %g4
390 mov SUN4V_CHIP_NIAGARA2, %g4
392 mov SUN4V_CHIP_UNKNOWN, %g4
393 5: sethi %hi(sun4v_chip_type), %g2
394 or %g2, %lo(sun4v_chip_type), %g2
398 BRANCH_IF_SUN4V(g1, jump_to_sun4u_init)
399 BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
400 BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
401 ba,pt %xcc, spitfire_boot
405 /* Preserve OBP chosen DCU and DCR register settings. */
406 ba,pt %xcc, cheetah_generic_boot
410 mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
413 sethi %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
414 or %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
416 or %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7
417 stxa %g7, [%g0] ASI_DCU_CONTROL_REG
420 cheetah_generic_boot:
421 mov TSB_EXTENSION_P, %g3
422 stxa %g0, [%g3] ASI_DMMU
423 stxa %g0, [%g3] ASI_IMMU
426 mov TSB_EXTENSION_S, %g3
427 stxa %g0, [%g3] ASI_DMMU
430 mov TSB_EXTENSION_N, %g3
431 stxa %g0, [%g3] ASI_DMMU
432 stxa %g0, [%g3] ASI_IMMU
435 ba,a,pt %xcc, jump_to_sun4u_init
438 /* Typically PROM has already enabled both MMU's and both on-chip
439 * caches, but we do it here anyway just to be paranoid.
441 mov (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1
442 stxa %g1, [%g0] ASI_LSU_CONTROL
447 * Make sure we are in privileged mode, have address masking,
448 * using the ordinary globals and have enabled floating
451 * Again, typically PROM has left %pil at 13 or similar, and
452 * (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate.
454 wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
461 .section .text.init.refok
463 BRANCH_IF_SUN4V(g1, sun4v_init)
466 mov PRIMARY_CONTEXT, %g7
467 stxa %g0, [%g7] ASI_DMMU
470 mov SECONDARY_CONTEXT, %g7
471 stxa %g0, [%g7] ASI_DMMU
474 ba,pt %xcc, sun4u_continue
479 mov PRIMARY_CONTEXT, %g7
480 stxa %g0, [%g7] ASI_MMU
483 mov SECONDARY_CONTEXT, %g7
484 stxa %g0, [%g7] ASI_MMU
486 ba,pt %xcc, niagara_tlb_fixup
490 BRANCH_IF_ANY_CHEETAH(g1, g7, cheetah_tlb_fixup)
492 ba,pt %xcc, spitfire_tlb_fixup
496 mov 3, %g2 /* Set TLB type to hypervisor. */
497 sethi %hi(tlb_type), %g1
498 stw %g2, [%g1 + %lo(tlb_type)]
500 /* Patch copy/clear ops. */
501 sethi %hi(sun4v_chip_type), %g1
502 lduw [%g1 + %lo(sun4v_chip_type)], %g1
503 cmp %g1, SUN4V_CHIP_NIAGARA1
504 be,pt %xcc, niagara_patch
505 cmp %g1, SUN4V_CHIP_NIAGARA2
506 be,pt %xcc, niagara2_patch
509 call generic_patch_copyops
511 call generic_patch_bzero
513 call generic_patch_pageops
518 call niagara2_patch_copyops
520 call niagara_patch_bzero
522 call niagara2_patch_pageops
528 call niagara_patch_copyops
530 call niagara_patch_bzero
532 call niagara_patch_pageops
536 /* Patch TLB/cache ops. */
537 call hypervisor_patch_cachetlbops
540 ba,pt %xcc, tlb_fixup_done
544 mov 2, %g2 /* Set TLB type to cheetah+. */
545 BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
547 mov 1, %g2 /* Set TLB type to cheetah. */
549 1: sethi %hi(tlb_type), %g1
550 stw %g2, [%g1 + %lo(tlb_type)]
552 /* Patch copy/page operations to cheetah optimized versions. */
553 call cheetah_patch_copyops
555 call cheetah_patch_copy_page
557 call cheetah_patch_cachetlbops
560 ba,pt %xcc, tlb_fixup_done
564 /* Set TLB type to spitfire. */
566 sethi %hi(tlb_type), %g1
567 stw %g2, [%g1 + %lo(tlb_type)]
570 sethi %hi(init_thread_union), %g6
571 or %g6, %lo(init_thread_union), %g6
572 ldx [%g6 + TI_TASK], %g4
577 sllx %g1, THREAD_SHIFT, %g1
578 sub %g1, (STACKFRAME_SZ + STACK_BIAS), %g1
582 /* Set per-cpu pointer initially to zero, this makes
583 * the boot-cpu use the in-kernel-image per-cpu areas
584 * before setup_per_cpu_area() is invoked.
592 sethi %hi(__bss_start), %o0
593 or %o0, %lo(__bss_start), %o0
595 or %o1, %lo(_end), %o1
599 #ifdef CONFIG_LOCKDEP
600 /* We have this call this super early, as even prom_init can grab
601 * spinlocks and thus call into the lockdep code.
607 mov %l6, %o1 ! OpenPROM stack
609 mov %l7, %o0 ! OpenPROM cif handler
611 /* Initialize current_thread_info()->cpu as early as possible.
612 * In order to do that accurately we have to patch up the get_cpuid()
613 * assembler sequences. And that, in turn, requires that we know
614 * if we are on a Starfire box or not. While we're here, patch up
615 * the sun4v sequences as well.
617 call check_if_starfire
625 call hard_smp_processor_id
630 call boot_cpu_id_too_large
635 /* If we boot on a non-zero cpu, all of the per-cpu
636 * variable references we make before setting up the
637 * per-cpu areas will use a bogus offset. Put a
638 * compensating factor into __per_cpu_base to handle
641 * What the per-cpu code calculates is:
643 * __per_cpu_base + (cpu << __per_cpu_shift)
645 * These two variables are zero initially, so to
646 * make it all cancel out to zero we need to put
647 * "0 - (cpu << 0)" into __per_cpu_base so that the
648 * above formula evaluates to zero.
650 * We cannot even perform a printk() until this stuff
651 * is setup as that calls cpu_clock() which uses
655 sethi %hi(__per_cpu_base), %o2
656 stx %o1, [%o2 + %lo(__per_cpu_base)]
660 sth %o0, [%g6 + TI_CPU]
662 call prom_init_report
672 /* This is meant to allow the sharing of this code between
673 * boot processor invocation (via setup_tba() below) and
674 * secondary processor startup (via trampoline.S). The
675 * former does use this code, the latter does not yet due
676 * to some complexities. That should be fixed up at some
679 * There used to be enormous complexity wrt. transferring
680 * over from the firwmare's trap table to the Linux kernel's.
681 * For example, there was a chicken & egg problem wrt. building
682 * the OBP page tables, yet needing to be on the Linux kernel
683 * trap table (to translate PAGE_OFFSET addresses) in order to
686 * We now handle OBP tlb misses differently, via linear lookups
687 * into the prom_trans[] array. So that specific problem no
688 * longer exists. Yet, unfortunately there are still some issues
689 * preventing trampoline.S from using this code... ho hum.
691 .globl setup_trap_table
695 /* Force interrupts to be disabled. */
697 andn %l0, PSTATE_IE, %o1
698 wrpr %o1, 0x0, %pstate
702 /* Make the firmware call to jump over to the Linux trap table. */
703 sethi %hi(is_sun4v), %o0
704 lduw [%o0 + %lo(is_sun4v)], %o0
708 TRAP_LOAD_TRAP_BLOCK(%g2, %g3)
709 add %g2, TRAP_PER_CPU_FAULT_INFO, %g2
710 stxa %g2, [%g0] ASI_SCRATCHPAD
712 /* Compute physical address:
714 * paddr = kern_base + (mmfsa_vaddr - KERNBASE)
716 sethi %hi(KERNBASE), %g3
718 sethi %hi(kern_base), %g3
719 ldx [%g3 + %lo(kern_base)], %g3
721 sethi %hi(sparc64_ttable_tl0), %o0
723 set prom_set_trap_table_name, %g2
724 stx %g2, [%sp + 2047 + 128 + 0x00]
726 stx %g2, [%sp + 2047 + 128 + 0x08]
728 stx %g2, [%sp + 2047 + 128 + 0x10]
729 stx %o0, [%sp + 2047 + 128 + 0x18]
730 stx %o1, [%sp + 2047 + 128 + 0x20]
731 sethi %hi(p1275buf), %g2
732 or %g2, %lo(p1275buf), %g2
733 ldx [%g2 + 0x08], %o1
735 add %sp, (2047 + 128), %o0
740 1: sethi %hi(sparc64_ttable_tl0), %o0
741 set prom_set_trap_table_name, %g2
742 stx %g2, [%sp + 2047 + 128 + 0x00]
744 stx %g2, [%sp + 2047 + 128 + 0x08]
746 stx %g2, [%sp + 2047 + 128 + 0x10]
747 stx %o0, [%sp + 2047 + 128 + 0x18]
748 sethi %hi(p1275buf), %g2
749 or %g2, %lo(p1275buf), %g2
750 ldx [%g2 + 0x08], %o1
752 add %sp, (2047 + 128), %o0
754 /* Start using proper page size encodings in ctx register. */
755 2: sethi %hi(sparc64_kern_pri_context), %g3
756 ldx [%g3 + %lo(sparc64_kern_pri_context)], %g2
758 mov PRIMARY_CONTEXT, %g1
760 661: stxa %g2, [%g1] ASI_DMMU
761 .section .sun4v_1insn_patch, "ax"
763 stxa %g2, [%g1] ASI_MMU
768 BRANCH_IF_SUN4V(o2, 1f)
770 /* Kill PROM timer */
771 sethi %hi(0x80000000), %o2
773 wr %o2, 0, %tick_cmpr
775 BRANCH_IF_ANY_CHEETAH(o2, o3, 1f)
780 /* Disable STICK_INT interrupts. */
782 sethi %hi(0x80000000), %o2
787 wrpr %g0, %g0, %wstate
789 call init_irqwork_curcpu
792 /* Now we can restore interrupt state. */
803 /* The boot processor is the only cpu which invokes this
804 * routine, the other cpus set things up via trampoline.S.
805 * So save the OBP trap table address here.
808 sethi %hi(prom_tba), %o1
809 or %o1, %lo(prom_tba), %o1
812 call setup_trap_table
821 #include "winfixup.S"
823 #include "sun4v_tlb_miss.S"
824 #include "sun4v_ivec.S"
829 * The following skip makes sure the trap table in ttable.S is aligned
830 * on a 32K boundary as required by the v9 specs for TBA register.
832 * We align to a 32K boundary, then we have the 32K kernel TSB,
833 * the 64K kernel 4MB TSB, and then the 32K aligned trap table.
836 .skip 0x4000 + _start - 1b
844 .globl swapper_4m_tsb
850 /* Some care needs to be exercised if you try to move the
851 * location of the trap table relative to other things. For
852 * one thing there are br* instructions in some of the
853 * trap table entires which branch back to code in ktlb.S
854 * Those instructions can only handle a signed 16-bit
857 * There is a binutils bug (bugzilla #4558) which causes
858 * the relocation overflow checks for such instructions to
859 * not be done correctly. So bintuils will not notice the
860 * error and will instead write junk into the relocation and
861 * you'll have an unbootable kernel.
871 .globl prom_tba, tlb_type
873 tlb_type: .word 0 /* Must NOT end up in BSS */
874 .section ".fixup",#alloc,#execinstr
876 .globl __ret_efault, __retl_efault
879 restore %g0, -EFAULT, %o0