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/version.h>
11 #include <linux/errno.h>
12 #include <linux/threads.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
103 prom_compatible_name:
113 prom_callmethod_name:
124 prom_root_compatible:
128 prom_mmu_ihandle_cache:
132 prom_boot_mapping_mode:
135 prom_boot_mapping_phys_high:
137 prom_boot_mapping_phys_low:
144 mov (1b - prom_peer_name), %l1
148 /* prom_root_node = prom_peer(0) */
149 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "peer"
151 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
152 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
153 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, 0
154 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
156 add %sp, (2047 + 128), %o0 ! argument array
158 ldx [%sp + 2047 + 128 + 0x20], %l4 ! prom root node
159 mov (1b - prom_root_node), %l1
163 mov (1b - prom_getprop_name), %l1
164 mov (1b - prom_compatible_name), %l2
165 mov (1b - prom_root_compatible), %l5
170 /* prom_getproperty(prom_root_node, "compatible",
171 * &prom_root_compatible, 64)
173 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
175 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
177 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
178 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, prom_root_node
179 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "compatible"
180 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_root_compatible
182 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, size
183 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
185 add %sp, (2047 + 128), %o0 ! argument array
187 mov (1b - prom_finddev_name), %l1
188 mov (1b - prom_chosen_path), %l2
189 mov (1b - prom_boot_mapped_pc), %l3
194 sub %sp, (192 + 128), %sp
196 /* chosen_node = prom_finddevice("/chosen") */
197 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice"
199 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
200 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
201 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, "/chosen"
202 stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
204 add %sp, (2047 + 128), %o0 ! argument array
206 ldx [%sp + 2047 + 128 + 0x20], %l4 ! chosen device node
208 mov (1b - prom_getprop_name), %l1
209 mov (1b - prom_mmu_name), %l2
210 mov (1b - prom_mmu_ihandle_cache), %l5
215 /* prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu") */
216 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
218 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
220 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
221 stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, chosen_node
222 stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "mmu"
223 stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_mmu_ihandle_cache
225 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, sizeof(arg3)
226 stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
228 add %sp, (2047 + 128), %o0 ! argument array
230 mov (1b - prom_callmethod_name), %l1
231 mov (1b - prom_translate_name), %l2
234 lduw [%l5], %l5 ! prom_mmu_ihandle_cache
236 stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "call-method"
238 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 3
240 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 5
241 stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1: "translate"
242 stx %l5, [%sp + 2047 + 128 + 0x20] ! arg2: prom_mmu_ihandle_cache
246 stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: vaddr, our PC
247 stx %g0, [%sp + 2047 + 128 + 0x30] ! res1
248 stx %g0, [%sp + 2047 + 128 + 0x38] ! res2
249 stx %g0, [%sp + 2047 + 128 + 0x40] ! res3
250 stx %g0, [%sp + 2047 + 128 + 0x48] ! res4
251 stx %g0, [%sp + 2047 + 128 + 0x50] ! res5
253 add %sp, (2047 + 128), %o0 ! argument array
255 ldx [%sp + 2047 + 128 + 0x40], %l1 ! translation mode
256 mov (1b - prom_boot_mapping_mode), %l4
259 mov (1b - prom_boot_mapping_phys_high), %l4
261 ldx [%sp + 2047 + 128 + 0x48], %l2 ! physaddr high
263 ldx [%sp + 2047 + 128 + 0x50], %l3 ! physaddr low
269 /* Leave service as-is, "call-method" */
271 stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 7
273 stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
274 mov (1b - prom_map_name), %l3
276 stx %l3, [%sp + 2047 + 128 + 0x18] ! arg1: "map"
277 /* Leave arg2 as-is, prom_mmu_ihandle_cache */
279 stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: mode (-1 default)
280 sethi %hi(8 * 1024 * 1024), %l3
281 stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4: size (8MB)
282 sethi %hi(KERNBASE), %l3
283 stx %l3, [%sp + 2047 + 128 + 0x38] ! arg5: vaddr (KERNBASE)
284 stx %g0, [%sp + 2047 + 128 + 0x40] ! arg6: empty
285 mov (1b - prom_boot_mapping_phys_low), %l3
288 stx %l3, [%sp + 2047 + 128 + 0x48] ! arg7: phys addr
290 add %sp, (2047 + 128), %o0 ! argument array
292 add %sp, (192 + 128), %sp
294 sethi %hi(prom_root_compatible), %g1
295 or %g1, %lo(prom_root_compatible), %g1
296 sethi %hi(prom_sun4v_name), %g7
297 or %g7, %lo(prom_sun4v_name), %g7
308 sethi %hi(is_sun4v), %g1
309 or %g1, %lo(is_sun4v), %g1
314 BRANCH_IF_SUN4V(g1, jump_to_sun4u_init)
315 BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
316 BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
317 ba,pt %xcc, spitfire_boot
321 /* Preserve OBP chosen DCU and DCR register settings. */
322 ba,pt %xcc, cheetah_generic_boot
326 mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
329 sethi %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
330 or %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
332 or %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7
333 stxa %g7, [%g0] ASI_DCU_CONTROL_REG
336 cheetah_generic_boot:
337 mov TSB_EXTENSION_P, %g3
338 stxa %g0, [%g3] ASI_DMMU
339 stxa %g0, [%g3] ASI_IMMU
342 mov TSB_EXTENSION_S, %g3
343 stxa %g0, [%g3] ASI_DMMU
346 mov TSB_EXTENSION_N, %g3
347 stxa %g0, [%g3] ASI_DMMU
348 stxa %g0, [%g3] ASI_IMMU
351 ba,a,pt %xcc, jump_to_sun4u_init
354 /* Typically PROM has already enabled both MMU's and both on-chip
355 * caches, but we do it here anyway just to be paranoid.
357 mov (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1
358 stxa %g1, [%g0] ASI_LSU_CONTROL
363 * Make sure we are in privileged mode, have address masking,
364 * using the ordinary globals and have enabled floating
367 * Again, typically PROM has left %pil at 13 or similar, and
368 * (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate.
370 wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
378 BRANCH_IF_SUN4V(g1, sun4v_init)
381 mov PRIMARY_CONTEXT, %g7
382 stxa %g0, [%g7] ASI_DMMU
385 mov SECONDARY_CONTEXT, %g7
386 stxa %g0, [%g7] ASI_DMMU
389 ba,pt %xcc, sun4u_continue
394 mov PRIMARY_CONTEXT, %g7
395 stxa %g0, [%g7] ASI_MMU
398 mov SECONDARY_CONTEXT, %g7
399 stxa %g0, [%g7] ASI_MMU
401 ba,pt %xcc, niagara_tlb_fixup
405 BRANCH_IF_ANY_CHEETAH(g1, g7, cheetah_tlb_fixup)
407 ba,pt %xcc, spitfire_tlb_fixup
411 mov 3, %g2 /* Set TLB type to hypervisor. */
412 sethi %hi(tlb_type), %g1
413 stw %g2, [%g1 + %lo(tlb_type)]
415 /* Patch copy/clear ops. */
416 call niagara_patch_copyops
418 call niagara_patch_bzero
420 call niagara_patch_pageops
423 /* Patch TLB/cache ops. */
424 call hypervisor_patch_cachetlbops
427 ba,pt %xcc, tlb_fixup_done
431 mov 2, %g2 /* Set TLB type to cheetah+. */
432 BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
434 mov 1, %g2 /* Set TLB type to cheetah. */
436 1: sethi %hi(tlb_type), %g1
437 stw %g2, [%g1 + %lo(tlb_type)]
439 /* Patch copy/page operations to cheetah optimized versions. */
440 call cheetah_patch_copyops
442 call cheetah_patch_copy_page
444 call cheetah_patch_cachetlbops
447 ba,pt %xcc, tlb_fixup_done
451 /* Set TLB type to spitfire. */
453 sethi %hi(tlb_type), %g1
454 stw %g2, [%g1 + %lo(tlb_type)]
457 sethi %hi(init_thread_union), %g6
458 or %g6, %lo(init_thread_union), %g6
459 ldx [%g6 + TI_TASK], %g4
465 sllx %g1, THREAD_SHIFT, %g1
466 sub %g1, (STACKFRAME_SZ + STACK_BIAS), %g1
470 /* Set per-cpu pointer initially to zero, this makes
471 * the boot-cpu use the in-kernel-image per-cpu areas
472 * before setup_per_cpu_area() is invoked.
480 sethi %hi(__bss_start), %o0
481 or %o0, %lo(__bss_start), %o0
483 or %o1, %lo(_end), %o1
487 #ifdef CONFIG_LOCKDEP
488 /* We have this call this super early, as even prom_init can grab
489 * spinlocks and thus call into the lockdep code.
495 mov %l6, %o1 ! OpenPROM stack
497 mov %l7, %o0 ! OpenPROM cif handler
499 /* Initialize current_thread_info()->cpu as early as possible.
500 * In order to do that accurately we have to patch up the get_cpuid()
501 * assembler sequences. And that, in turn, requires that we know
502 * if we are on a Starfire box or not. While we're here, patch up
503 * the sun4v sequences as well.
505 call check_if_starfire
513 call hard_smp_processor_id
518 call boot_cpu_id_too_large
526 sth %o0, [%g6 + TI_CPU]
533 /* This is meant to allow the sharing of this code between
534 * boot processor invocation (via setup_tba() below) and
535 * secondary processor startup (via trampoline.S). The
536 * former does use this code, the latter does not yet due
537 * to some complexities. That should be fixed up at some
540 * There used to be enormous complexity wrt. transferring
541 * over from the firwmare's trap table to the Linux kernel's.
542 * For example, there was a chicken & egg problem wrt. building
543 * the OBP page tables, yet needing to be on the Linux kernel
544 * trap table (to translate PAGE_OFFSET addresses) in order to
547 * We now handle OBP tlb misses differently, via linear lookups
548 * into the prom_trans[] array. So that specific problem no
549 * longer exists. Yet, unfortunately there are still some issues
550 * preventing trampoline.S from using this code... ho hum.
552 .globl setup_trap_table
556 /* Force interrupts to be disabled. */
558 andn %l0, PSTATE_IE, %o1
559 wrpr %o1, 0x0, %pstate
563 /* Make the firmware call to jump over to the Linux trap table. */
564 sethi %hi(is_sun4v), %o0
565 lduw [%o0 + %lo(is_sun4v)], %o0
569 TRAP_LOAD_TRAP_BLOCK(%g2, %g3)
570 add %g2, TRAP_PER_CPU_FAULT_INFO, %g2
571 stxa %g2, [%g0] ASI_SCRATCHPAD
573 /* Compute physical address:
575 * paddr = kern_base + (mmfsa_vaddr - KERNBASE)
577 sethi %hi(KERNBASE), %g3
579 sethi %hi(kern_base), %g3
580 ldx [%g3 + %lo(kern_base)], %g3
583 call prom_set_trap_table_sun4v
584 sethi %hi(sparc64_ttable_tl0), %o0
589 1: call prom_set_trap_table
590 sethi %hi(sparc64_ttable_tl0), %o0
592 /* Start using proper page size encodings in ctx register. */
593 2: sethi %hi(sparc64_kern_pri_context), %g3
594 ldx [%g3 + %lo(sparc64_kern_pri_context)], %g2
596 mov PRIMARY_CONTEXT, %g1
598 661: stxa %g2, [%g1] ASI_DMMU
599 .section .sun4v_1insn_patch, "ax"
601 stxa %g2, [%g1] ASI_MMU
606 /* Kill PROM timer */
607 sethi %hi(0x80000000), %o2
609 wr %o2, 0, %tick_cmpr
611 BRANCH_IF_SUN4V(o2, 1f)
612 BRANCH_IF_ANY_CHEETAH(o2, o3, 1f)
617 /* Disable STICK_INT interrupts. */
619 sethi %hi(0x80000000), %o2
624 wrpr %g0, %g0, %wstate
626 call init_irqwork_curcpu
629 /* Now we can restore interrupt state. */
640 /* The boot processor is the only cpu which invokes this
641 * routine, the other cpus set things up via trampoline.S.
642 * So save the OBP trap table address here.
645 sethi %hi(prom_tba), %o1
646 or %o1, %lo(prom_tba), %o1
649 call setup_trap_table
658 #include "winfixup.S"
660 #include "sun4v_tlb_miss.S"
661 #include "sun4v_ivec.S"
666 * The following skip makes sure the trap table in ttable.S is aligned
667 * on a 32K boundary as required by the v9 specs for TBA register.
669 * We align to a 32K boundary, then we have the 32K kernel TSB,
670 * the 64K kernel 4MB TSB, and then the 32K aligned trap table.
673 .skip 0x4000 + _start - 1b
681 .globl swapper_4m_tsb
687 /* Some care needs to be exercised if you try to move the
688 * location of the trap table relative to other things. For
689 * one thing there are br* instructions in some of the
690 * trap table entires which branch back to code in ktlb.S
691 * Those instructions can only handle a signed 16-bit
694 * There is a binutils bug (bugzilla #4558) which causes
695 * the relocation overflow checks for such instructions to
696 * not be done correctly. So bintuils will not notice the
697 * error and will instead write junk into the relocation and
698 * you'll have an unbootable kernel.
708 .globl prom_tba, tlb_type
710 tlb_type: .word 0 /* Must NOT end up in BSS */
711 .section ".fixup",#alloc,#execinstr
713 .globl __ret_efault, __retl_efault
716 restore %g0, -EFAULT, %o0