1 /* $Id: head.S,v 1.87 2002/02/09 19:49:31 davem Exp $
2 * head.S: Initial boot code for the Sparc64 port of Linux.
4 * Copyright (C) 1996,1997 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1996 David Sitsky (David.Sitsky@anu.edu.au)
6 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 * Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
10 #include <linux/config.h>
11 #include <linux/version.h>
12 #include <linux/errno.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. */
84 be,pn %xcc, sparc64_boot_after_remap
87 /* We need to remap the kernel. Use position independant
88 * code to remap us to KERNBASE.
90 * SILO can invoke us with 32-bit address masking enabled,
91 * so make sure that's clear.
94 andn %g1, PSTATE_AM, %g1
95 wrpr %g1, 0x0, %pstate
98 .globl prom_finddev_name, prom_chosen_path, prom_root_node
99 .globl prom_getprop_name, prom_mmu_name, prom_peer_name
100 .globl prom_callmethod_name, prom_translate_name, prom_root_compatible
101 .globl prom_map_name, prom_unmap_name, prom_mmu_ihandle_cache
102 .globl prom_boot_mapped_pc, prom_boot_mapping_mode
103 .globl prom_boot_mapping_phys_high, prom_boot_mapping_phys_low
107 prom_compatible_name:
117 prom_callmethod_name:
128 prom_root_compatible:
132 prom_mmu_ihandle_cache:
136 prom_boot_mapping_mode:
139 prom_boot_mapping_phys_high:
141 prom_boot_mapping_phys_low:
148 mov (1b - prom_peer_name), %l1
152 /* prom_root_node = prom_peer(0) */
153 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "peer"
155 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
156 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
157 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, 0
158 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
160 add %sp, (2047 + 128), %o0 ! argument array
162 ldx [%sp + 2047 + 128 + 0x20], %l4 ! prom root node
163 mov (1b - prom_root_node), %l1
167 mov (1b - prom_getprop_name), %l1
168 mov (1b - prom_compatible_name), %l2
169 mov (1b - prom_root_compatible), %l5
174 /* prom_getproperty(prom_root_node, "compatible",
175 * &prom_root_compatible, 64)
177 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
179 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
181 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
182 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, prom_root_node
183 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "compatible"
184 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_root_compatible
186 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, size
187 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
189 add %sp, (2047 + 128), %o0 ! argument array
191 mov (1b - prom_finddev_name), %l1
192 mov (1b - prom_chosen_path), %l2
193 mov (1b - prom_boot_mapped_pc), %l3
198 sub %sp, (192 + 128), %sp
200 /* chosen_node = prom_finddevice("/chosen") */
201 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice"
203 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
204 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
205 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, "/chosen"
206 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
208 add %sp, (2047 + 128), %o0 ! argument array
210 ldx [%sp + 2047 + 128 + 0x20], %l4 ! chosen device node
212 mov (1b - prom_getprop_name), %l1
213 mov (1b - prom_mmu_name), %l2
214 mov (1b - prom_mmu_ihandle_cache), %l5
219 /* prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu") */
220 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
222 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
224 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
225 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, chosen_node
226 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "mmu"
227 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_mmu_ihandle_cache
229 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, sizeof(arg3)
230 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
232 add %sp, (2047 + 128), %o0 ! argument array
234 mov (1b - prom_callmethod_name), %l1
235 mov (1b - prom_translate_name), %l2
238 lduw [%l5], %l5 ! prom_mmu_ihandle_cache
240 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "call-method"
242 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 3
244 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 5
245 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1: "translate"
246 stx %l5, [%sp + 2047 + 128 + 0x20] ! arg2: prom_mmu_ihandle_cache
250 stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: vaddr, our PC
251 stx %g0, [%sp + 2047 + 128 + 0x30] ! res1
252 stx %g0, [%sp + 2047 + 128 + 0x38] ! res2
253 stx %g0, [%sp + 2047 + 128 + 0x40] ! res3
254 stx %g0, [%sp + 2047 + 128 + 0x48] ! res4
255 stx %g0, [%sp + 2047 + 128 + 0x50] ! res5
257 add %sp, (2047 + 128), %o0 ! argument array
259 ldx [%sp + 2047 + 128 + 0x40], %l1 ! translation mode
260 mov (1b - prom_boot_mapping_mode), %l4
263 mov (1b - prom_boot_mapping_phys_high), %l4
265 ldx [%sp + 2047 + 128 + 0x48], %l2 ! physaddr high
267 ldx [%sp + 2047 + 128 + 0x50], %l3 ! physaddr low
273 /* Leave service as-is, "call-method" */
275 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 7
277 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
278 mov (1b - prom_map_name), %l3
280 stx %l3, [%sp + 2047 + 128 + 0x18] ! arg1: "map"
281 /* Leave arg2 as-is, prom_mmu_ihandle_cache */
283 stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: mode (-1 default)
284 sethi %hi(8 * 1024 * 1024), %l3
285 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4: size (8MB)
286 sethi %hi(KERNBASE), %l3
287 stx %l3, [%sp + 2047 + 128 + 0x38] ! arg5: vaddr (KERNBASE)
288 stx %g0, [%sp + 2047 + 128 + 0x40] ! arg6: empty
289 mov (1b - prom_boot_mapping_phys_low), %l3
292 stx %l3, [%sp + 2047 + 128 + 0x48] ! arg7: phys addr
294 add %sp, (2047 + 128), %o0 ! argument array
296 add %sp, (192 + 128), %sp
298 sparc64_boot_after_remap:
299 sethi %hi(prom_root_compatible), %g1
300 or %g1, %lo(prom_root_compatible), %g1
301 sethi %hi(prom_sun4v_name), %g7
302 or %g7, %lo(prom_sun4v_name), %g7
313 sethi %hi(is_sun4v), %g1
314 or %g1, %lo(is_sun4v), %g1
319 BRANCH_IF_SUN4V(g1, jump_to_sun4u_init)
320 BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
321 BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
322 ba,pt %xcc, spitfire_boot
326 /* Preserve OBP chosen DCU and DCR register settings. */
327 ba,pt %xcc, cheetah_generic_boot
331 mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
334 sethi %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
335 or %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
337 or %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7
338 stxa %g7, [%g0] ASI_DCU_CONTROL_REG
341 cheetah_generic_boot:
342 mov TSB_EXTENSION_P, %g3
343 stxa %g0, [%g3] ASI_DMMU
344 stxa %g0, [%g3] ASI_IMMU
347 mov TSB_EXTENSION_S, %g3
348 stxa %g0, [%g3] ASI_DMMU
351 mov TSB_EXTENSION_N, %g3
352 stxa %g0, [%g3] ASI_DMMU
353 stxa %g0, [%g3] ASI_IMMU
356 ba,a,pt %xcc, jump_to_sun4u_init
359 /* Typically PROM has already enabled both MMU's and both on-chip
360 * caches, but we do it here anyway just to be paranoid.
362 mov (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1
363 stxa %g1, [%g0] ASI_LSU_CONTROL
368 * Make sure we are in privileged mode, have address masking,
369 * using the ordinary globals and have enabled floating
372 * Again, typically PROM has left %pil at 13 or similar, and
373 * (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate.
375 wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
383 BRANCH_IF_SUN4V(g1, sun4v_init)
386 mov PRIMARY_CONTEXT, %g7
387 stxa %g0, [%g7] ASI_DMMU
390 mov SECONDARY_CONTEXT, %g7
391 stxa %g0, [%g7] ASI_DMMU
394 ba,pt %xcc, sun4u_continue
399 mov PRIMARY_CONTEXT, %g7
400 stxa %g0, [%g7] ASI_MMU
403 mov SECONDARY_CONTEXT, %g7
404 stxa %g0, [%g7] ASI_MMU
406 ba,pt %xcc, niagara_tlb_fixup
410 BRANCH_IF_ANY_CHEETAH(g1, g7, cheetah_tlb_fixup)
412 ba,pt %xcc, spitfire_tlb_fixup
416 mov 3, %g2 /* Set TLB type to hypervisor. */
417 sethi %hi(tlb_type), %g1
418 stw %g2, [%g1 + %lo(tlb_type)]
420 /* Patch copy/clear ops. */
421 call niagara_patch_copyops
423 call niagara_patch_bzero
425 call niagara_patch_pageops
428 /* Patch TLB/cache ops. */
429 call hypervisor_patch_cachetlbops
432 ba,pt %xcc, tlb_fixup_done
436 mov 2, %g2 /* Set TLB type to cheetah+. */
437 BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
439 mov 1, %g2 /* Set TLB type to cheetah. */
441 1: sethi %hi(tlb_type), %g1
442 stw %g2, [%g1 + %lo(tlb_type)]
444 /* Patch copy/page operations to cheetah optimized versions. */
445 call cheetah_patch_copyops
447 call cheetah_patch_copy_page
449 call cheetah_patch_cachetlbops
452 ba,pt %xcc, tlb_fixup_done
456 /* Set TLB type to spitfire. */
458 sethi %hi(tlb_type), %g1
459 stw %g2, [%g1 + %lo(tlb_type)]
462 sethi %hi(init_thread_union), %g6
463 or %g6, %lo(init_thread_union), %g6
464 ldx [%g6 + TI_TASK], %g4
470 sllx %g1, THREAD_SHIFT, %g1
471 sub %g1, (STACKFRAME_SZ + STACK_BIAS), %g1
475 /* Set per-cpu pointer initially to zero, this makes
476 * the boot-cpu use the in-kernel-image per-cpu areas
477 * before setup_per_cpu_area() is invoked.
485 sethi %hi(__bss_start), %o0
486 or %o0, %lo(__bss_start), %o0
488 or %o1, %lo(_end), %o1
492 mov %l6, %o1 ! OpenPROM stack
494 mov %l7, %o0 ! OpenPROM cif handler
501 /* This is meant to allow the sharing of this code between
502 * boot processor invocation (via setup_tba() below) and
503 * secondary processor startup (via trampoline.S). The
504 * former does use this code, the latter does not yet due
505 * to some complexities. That should be fixed up at some
508 * There used to be enormous complexity wrt. transferring
509 * over from the firwmare's trap table to the Linux kernel's.
510 * For example, there was a chicken & egg problem wrt. building
511 * the OBP page tables, yet needing to be on the Linux kernel
512 * trap table (to translate PAGE_OFFSET addresses) in order to
515 * We now handle OBP tlb misses differently, via linear lookups
516 * into the prom_trans[] array. So that specific problem no
517 * longer exists. Yet, unfortunately there are still some issues
518 * preventing trampoline.S from using this code... ho hum.
520 .globl setup_trap_table
524 /* Force interrupts to be disabled. */
526 andn %o1, PSTATE_IE, %o1
527 wrpr %o1, 0x0, %pstate
530 /* Make the firmware call to jump over to the Linux trap table. */
531 sethi %hi(is_sun4v), %o0
532 lduw [%o0 + %lo(is_sun4v)], %o0
536 TRAP_LOAD_TRAP_BLOCK(%g2, %g3)
537 add %g2, TRAP_PER_CPU_FAULT_INFO, %g2
538 stxa %g2, [%g0] ASI_SCRATCHPAD
540 /* Compute physical address:
542 * paddr = kern_base + (mmfsa_vaddr - KERNBASE)
544 sethi %hi(KERNBASE), %g3
546 sethi %hi(kern_base), %g3
547 ldx [%g3 + %lo(kern_base)], %g3
550 call prom_set_trap_table_sun4v
551 sethi %hi(sparc64_ttable_tl0), %o0
556 1: call prom_set_trap_table
557 sethi %hi(sparc64_ttable_tl0), %o0
559 /* Start using proper page size encodings in ctx register. */
560 2: sethi %hi(sparc64_kern_pri_context), %g3
561 ldx [%g3 + %lo(sparc64_kern_pri_context)], %g2
563 mov PRIMARY_CONTEXT, %g1
565 661: stxa %g2, [%g1] ASI_DMMU
566 .section .sun4v_1insn_patch, "ax"
568 stxa %g2, [%g1] ASI_MMU
573 /* Kill PROM timer */
574 sethi %hi(0x80000000), %o2
576 wr %o2, 0, %tick_cmpr
578 BRANCH_IF_SUN4V(o2, 1f)
579 BRANCH_IF_ANY_CHEETAH(o2, o3, 1f)
584 /* Disable STICK_INT interrupts. */
586 sethi %hi(0x80000000), %o2
591 wrpr %g0, %g0, %wstate
593 call init_irqwork_curcpu
596 /* Now we can turn interrupts back on. */
598 or %o1, PSTATE_IE, %o1
609 /* The boot processor is the only cpu which invokes this
610 * routine, the other cpus set things up via trampoline.S.
611 * So save the OBP trap table address here.
614 sethi %hi(prom_tba), %o1
615 or %o1, %lo(prom_tba), %o1
618 call setup_trap_table
629 #include "winfixup.S"
631 #include "sun4v_tlb_miss.S"
632 #include "sun4v_ivec.S"
635 * The following skip makes sure the trap table in ttable.S is aligned
636 * on a 32K boundary as required by the v9 specs for TBA register.
638 * We align to a 32K boundary, then we have the 32K kernel TSB,
639 * then the 32K aligned trap table.
642 .skip 0x4000 + _start - 1b
656 .globl prom_tba, tlb_type
658 tlb_type: .word 0 /* Must NOT end up in BSS */
659 .section ".fixup",#alloc,#execinstr
661 .globl __ret_efault, __retl_efault
664 restore %g0, -EFAULT, %o0