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linux/arch/sparc64/kernel/head.S
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

783 lines
18 KiB
ArmAsm
Raw Blame History

/* $Id: head.S,v 1.87 2002/02/09 19:49:31 davem Exp $
* head.S: Initial boot code for the Sparc64 port of Linux.
*
* Copyright (C) 1996,1997 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1996 David Sitsky (David.Sitsky@anu.edu.au)
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
* Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
*/
#include <linux/config.h>
#include <linux/version.h>
#include <linux/errno.h>
#include <asm/thread_info.h>
#include <asm/asi.h>
#include <asm/pstate.h>
#include <asm/ptrace.h>
#include <asm/spitfire.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/errno.h>
#include <asm/signal.h>
#include <asm/processor.h>
#include <asm/lsu.h>
#include <asm/dcr.h>
#include <asm/dcu.h>
#include <asm/head.h>
#include <asm/ttable.h>
#include <asm/mmu.h>
/* This section from from _start to sparc64_boot_end should fit into
* 0x0000.0000.0040.4000 to 0x0000.0000.0040.8000 and will be sharing space
* with bootup_user_stack, which is from 0x0000.0000.0040.4000 to
* 0x0000.0000.0040.6000 and empty_bad_page, which is from
* 0x0000.0000.0040.6000 to 0x0000.0000.0040.8000.
*/
.text
.globl start, _start, stext, _stext
_start:
start:
_stext:
stext:
bootup_user_stack:
! 0x0000000000404000
b sparc64_boot
flushw /* Flush register file. */
/* This stuff has to be in sync with SILO and other potential boot loaders
* Fields should be kept upward compatible and whenever any change is made,
* HdrS version should be incremented.
*/
.global root_flags, ram_flags, root_dev
.global sparc_ramdisk_image, sparc_ramdisk_size
.global sparc_ramdisk_image64
.ascii "HdrS"
.word LINUX_VERSION_CODE
/* History:
*
* 0x0300 : Supports being located at other than 0x4000
* 0x0202 : Supports kernel params string
* 0x0201 : Supports reboot_command
*/
.half 0x0301 /* HdrS version */
root_flags:
.half 1
root_dev:
.half 0
ram_flags:
.half 0
sparc_ramdisk_image:
.word 0
sparc_ramdisk_size:
.word 0
.xword reboot_command
.xword bootstr_info
sparc_ramdisk_image64:
.xword 0
.word _end
/* We must be careful, 32-bit OpenBOOT will get confused if it
* tries to save away a register window to a 64-bit kernel
* stack address. Flush all windows, disable interrupts,
* remap if necessary, jump onto kernel trap table, then kernel
* stack, or else we die.
*
* PROM entry point is on %o4
*/
sparc64_boot:
BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
ba,pt %xcc, spitfire_boot
nop
cheetah_plus_boot:
/* Preserve OBP chosen DCU and DCR register settings. */
ba,pt %xcc, cheetah_generic_boot
nop
cheetah_boot:
mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
wr %g1, %asr18
sethi %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
or %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
sllx %g7, 32, %g7
or %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7
stxa %g7, [%g0] ASI_DCU_CONTROL_REG
membar #Sync
cheetah_generic_boot:
mov TSB_EXTENSION_P, %g3
stxa %g0, [%g3] ASI_DMMU
stxa %g0, [%g3] ASI_IMMU
membar #Sync
mov TSB_EXTENSION_S, %g3
stxa %g0, [%g3] ASI_DMMU
membar #Sync
mov TSB_EXTENSION_N, %g3
stxa %g0, [%g3] ASI_DMMU
stxa %g0, [%g3] ASI_IMMU
membar #Sync
wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
wr %g0, 0, %fprs
/* Just like for Spitfire, we probe itlb-2 for a mapping which
* matches our current %pc. We take the physical address in
* that mapping and use it to make our own.
*/
/* %g5 holds the tlb data */
sethi %uhi(_PAGE_VALID | _PAGE_SZ4MB), %g5
sllx %g5, 32, %g5
or %g5, (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_L | _PAGE_W | _PAGE_G), %g5
/* Put PADDR tlb data mask into %g3. */
sethi %uhi(_PAGE_PADDR), %g3
or %g3, %ulo(_PAGE_PADDR), %g3
sllx %g3, 32, %g3
sethi %hi(_PAGE_PADDR), %g7
or %g7, %lo(_PAGE_PADDR), %g7
or %g3, %g7, %g3
set 2 << 16, %l0 /* TLB entry walker. */
set 0x1fff, %l2 /* Page mask. */
rd %pc, %l3
andn %l3, %l2, %g2 /* vaddr comparator */
1: ldxa [%l0] ASI_ITLB_TAG_READ, %g1
membar #Sync
andn %g1, %l2, %g1
cmp %g1, %g2
be,pn %xcc, cheetah_got_tlbentry
nop
and %l0, (127 << 3), %g1
cmp %g1, (127 << 3)
blu,pt %xcc, 1b
add %l0, (1 << 3), %l0
/* Search the small TLB. OBP never maps us like that but
* newer SILO can.
*/
clr %l0
1: ldxa [%l0] ASI_ITLB_TAG_READ, %g1
membar #Sync
andn %g1, %l2, %g1
cmp %g1, %g2
be,pn %xcc, cheetah_got_tlbentry
nop
cmp %l0, (15 << 3)
blu,pt %xcc, 1b
add %l0, (1 << 3), %l0
/* BUG() if we get here... */
ta 0x5
cheetah_got_tlbentry:
ldxa [%l0] ASI_ITLB_DATA_ACCESS, %g0
ldxa [%l0] ASI_ITLB_DATA_ACCESS, %g1
membar #Sync
and %g1, %g3, %g1
set 0x5fff, %l0
andn %g1, %l0, %g1
or %g5, %g1, %g5
/* Clear out any KERNBASE area entries. */
set 2 << 16, %l0
sethi %hi(KERNBASE), %g3
sethi %hi(KERNBASE<<1), %g7
mov TLB_TAG_ACCESS, %l7
/* First, check ITLB */
1: ldxa [%l0] ASI_ITLB_TAG_READ, %g1
membar #Sync
andn %g1, %l2, %g1
cmp %g1, %g3
blu,pn %xcc, 2f
cmp %g1, %g7
bgeu,pn %xcc, 2f
nop
stxa %g0, [%l7] ASI_IMMU
membar #Sync
stxa %g0, [%l0] ASI_ITLB_DATA_ACCESS
membar #Sync
2: and %l0, (127 << 3), %g1
cmp %g1, (127 << 3)
blu,pt %xcc, 1b
add %l0, (1 << 3), %l0
/* Next, check DTLB */
set 2 << 16, %l0
1: ldxa [%l0] ASI_DTLB_TAG_READ, %g1
membar #Sync
andn %g1, %l2, %g1
cmp %g1, %g3
blu,pn %xcc, 2f
cmp %g1, %g7
bgeu,pn %xcc, 2f
nop
stxa %g0, [%l7] ASI_DMMU
membar #Sync
stxa %g0, [%l0] ASI_DTLB_DATA_ACCESS
membar #Sync
2: and %l0, (511 << 3), %g1
cmp %g1, (511 << 3)
blu,pt %xcc, 1b
add %l0, (1 << 3), %l0
/* On Cheetah+, have to check second DTLB. */
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,l0,2f)
ba,pt %xcc, 9f
nop
2: set 3 << 16, %l0
1: ldxa [%l0] ASI_DTLB_TAG_READ, %g1
membar #Sync
andn %g1, %l2, %g1
cmp %g1, %g3
blu,pn %xcc, 2f
cmp %g1, %g7
bgeu,pn %xcc, 2f
nop
stxa %g0, [%l7] ASI_DMMU
membar #Sync
stxa %g0, [%l0] ASI_DTLB_DATA_ACCESS
membar #Sync
2: and %l0, (511 << 3), %g1
cmp %g1, (511 << 3)
blu,pt %xcc, 1b
add %l0, (1 << 3), %l0
9:
/* Now lock the TTE we created into ITLB-0 and DTLB-0,
* entry 15 (and maybe 14 too).
*/
sethi %hi(KERNBASE), %g3
set (0 << 16) | (15 << 3), %g7
stxa %g3, [%l7] ASI_DMMU
membar #Sync
stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS
membar #Sync
stxa %g3, [%l7] ASI_IMMU
membar #Sync
stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS
membar #Sync
flush %g3
membar #Sync
sethi %hi(_end), %g3 /* Check for bigkernel case */
or %g3, %lo(_end), %g3
srl %g3, 23, %g3 /* Check if _end > 8M */
brz,pt %g3, 1f
sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */
sethi %hi(0x400000), %g3
or %g3, %lo(0x400000), %g3
add %g5, %g3, %g5 /* New tte data */
andn %g5, (_PAGE_G), %g5
sethi %hi(KERNBASE+0x400000), %g3
or %g3, %lo(KERNBASE+0x400000), %g3
set (0 << 16) | (14 << 3), %g7
stxa %g3, [%l7] ASI_DMMU
membar #Sync
stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS
membar #Sync
stxa %g3, [%l7] ASI_IMMU
membar #Sync
stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS
membar #Sync
flush %g3
membar #Sync
sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */
ba,pt %xcc, 1f
nop
1: set sun4u_init, %g2
jmpl %g2 + %g0, %g0
nop
spitfire_boot:
/* Typically PROM has already enabled both MMU's and both on-chip
* caches, but we do it here anyway just to be paranoid.
*/
mov (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1
stxa %g1, [%g0] ASI_LSU_CONTROL
membar #Sync
/*
* Make sure we are in privileged mode, have address masking,
* using the ordinary globals and have enabled floating
* point.
*
* Again, typically PROM has left %pil at 13 or similar, and
* (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate.
*/
wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
wr %g0, 0, %fprs
spitfire_create_mappings:
/* %g5 holds the tlb data */
sethi %uhi(_PAGE_VALID | _PAGE_SZ4MB), %g5
sllx %g5, 32, %g5
or %g5, (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_L | _PAGE_W | _PAGE_G), %g5
/* Base of physical memory cannot reliably be assumed to be
* at 0x0! Figure out where it happens to be. -DaveM
*/
/* Put PADDR tlb data mask into %g3. */
sethi %uhi(_PAGE_PADDR_SF), %g3
or %g3, %ulo(_PAGE_PADDR_SF), %g3
sllx %g3, 32, %g3
sethi %hi(_PAGE_PADDR_SF), %g7
or %g7, %lo(_PAGE_PADDR_SF), %g7
or %g3, %g7, %g3
/* Walk through entire ITLB, looking for entry which maps
* our %pc currently, stick PADDR from there into %g5 tlb data.
*/
clr %l0 /* TLB entry walker. */
set 0x1fff, %l2 /* Page mask. */
rd %pc, %l3
andn %l3, %l2, %g2 /* vaddr comparator */
1:
/* Yes, the nops seem to be necessary for now, don't ask me why. -DaveM */
ldxa [%l0] ASI_ITLB_TAG_READ, %g1
nop
nop
nop
andn %g1, %l2, %g1 /* Get vaddr */
cmp %g1, %g2
be,a,pn %xcc, spitfire_got_tlbentry
ldxa [%l0] ASI_ITLB_DATA_ACCESS, %g1
cmp %l0, (63 << 3)
blu,pt %xcc, 1b
add %l0, (1 << 3), %l0
/* BUG() if we get here... */
ta 0x5
spitfire_got_tlbentry:
/* Nops here again, perhaps Cheetah/Blackbird are better behaved... */
nop
nop
nop
and %g1, %g3, %g1 /* Mask to just get paddr bits. */
set 0x5fff, %l3 /* Mask offset to get phys base. */
andn %g1, %l3, %g1
/* NOTE: We hold on to %g1 paddr base as we need it below to lock
* NOTE: the PROM cif code into the TLB.
*/
or %g5, %g1, %g5 /* Or it into TAG being built. */
clr %l0 /* TLB entry walker. */
sethi %hi(KERNBASE), %g3 /* 4M lower limit */
sethi %hi(KERNBASE<<1), %g7 /* 8M upper limit */
mov TLB_TAG_ACCESS, %l7
1:
/* Yes, the nops seem to be necessary for now, don't ask me why. -DaveM */
ldxa [%l0] ASI_ITLB_TAG_READ, %g1
nop
nop
nop
andn %g1, %l2, %g1 /* Get vaddr */
cmp %g1, %g3
blu,pn %xcc, 2f
cmp %g1, %g7
bgeu,pn %xcc, 2f
nop
stxa %g0, [%l7] ASI_IMMU
stxa %g0, [%l0] ASI_ITLB_DATA_ACCESS
membar #Sync
2:
cmp %l0, (63 << 3)
blu,pt %xcc, 1b
add %l0, (1 << 3), %l0
nop; nop; nop
clr %l0 /* TLB entry walker. */
1:
/* Yes, the nops seem to be necessary for now, don't ask me why. -DaveM */
ldxa [%l0] ASI_DTLB_TAG_READ, %g1
nop
nop
nop
andn %g1, %l2, %g1 /* Get vaddr */
cmp %g1, %g3
blu,pn %xcc, 2f
cmp %g1, %g7
bgeu,pn %xcc, 2f
nop
stxa %g0, [%l7] ASI_DMMU
stxa %g0, [%l0] ASI_DTLB_DATA_ACCESS
membar #Sync
2:
cmp %l0, (63 << 3)
blu,pt %xcc, 1b
add %l0, (1 << 3), %l0
nop; nop; nop
/* PROM never puts any TLB entries into the MMU with the lock bit
* set. So we gladly use tlb entry 63 for KERNBASE. And maybe 62 too.
*/
sethi %hi(KERNBASE), %g3
mov (63 << 3), %g7
stxa %g3, [%l7] ASI_DMMU /* KERNBASE into TLB TAG */
stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS /* TTE into TLB DATA */
membar #Sync
stxa %g3, [%l7] ASI_IMMU /* KERNBASE into TLB TAG */
stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS /* TTE into TLB DATA */
membar #Sync
flush %g3
membar #Sync
sethi %hi(_end), %g3 /* Check for bigkernel case */
or %g3, %lo(_end), %g3
srl %g3, 23, %g3 /* Check if _end > 8M */
brz,pt %g3, 2f
sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */
sethi %hi(0x400000), %g3
or %g3, %lo(0x400000), %g3
add %g5, %g3, %g5 /* New tte data */
andn %g5, (_PAGE_G), %g5
sethi %hi(KERNBASE+0x400000), %g3
or %g3, %lo(KERNBASE+0x400000), %g3
mov (62 << 3), %g7
stxa %g3, [%l7] ASI_DMMU
stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS
membar #Sync
stxa %g3, [%l7] ASI_IMMU
stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS
membar #Sync
flush %g3
membar #Sync
sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */
2: ba,pt %xcc, 1f
nop
1:
set sun4u_init, %g2
jmpl %g2 + %g0, %g0
nop
sun4u_init:
/* Set ctx 0 */
mov PRIMARY_CONTEXT, %g7
stxa %g0, [%g7] ASI_DMMU
membar #Sync
mov SECONDARY_CONTEXT, %g7
stxa %g0, [%g7] ASI_DMMU
membar #Sync
/* We are now safely (we hope) in Nucleus context (0), rewrite
* the KERNBASE TTE's so they no longer have the global bit set.
* Don't forget to setup TAG_ACCESS first 8-)
*/
mov TLB_TAG_ACCESS, %g2
stxa %g3, [%g2] ASI_IMMU
stxa %g3, [%g2] ASI_DMMU
membar #Sync
BRANCH_IF_ANY_CHEETAH(g1,g7,cheetah_tlb_fixup)
ba,pt %xcc, spitfire_tlb_fixup
nop
cheetah_tlb_fixup:
set (0 << 16) | (15 << 3), %g7
ldxa [%g7] ASI_ITLB_DATA_ACCESS, %g0
ldxa [%g7] ASI_ITLB_DATA_ACCESS, %g1
andn %g1, (_PAGE_G), %g1
stxa %g1, [%g7] ASI_ITLB_DATA_ACCESS
membar #Sync
ldxa [%g7] ASI_DTLB_DATA_ACCESS, %g0
ldxa [%g7] ASI_DTLB_DATA_ACCESS, %g1
andn %g1, (_PAGE_G), %g1
stxa %g1, [%g7] ASI_DTLB_DATA_ACCESS
membar #Sync
/* Kill instruction prefetch queues. */
flush %g3
membar #Sync
mov 2, %g2 /* Set TLB type to cheetah+. */
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
mov 1, %g2 /* Set TLB type to cheetah. */
1: sethi %hi(tlb_type), %g1
stw %g2, [%g1 + %lo(tlb_type)]
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
ba,pt %xcc, 2f
nop
1: /* Patch context register writes to support nucleus page
* size correctly.
*/
call cheetah_plus_patch_etrap
nop
call cheetah_plus_patch_rtrap
nop
call cheetah_plus_patch_fpdis
nop
call cheetah_plus_patch_winfixup
nop
2: /* Patch copy/page operations to cheetah optimized versions. */
call cheetah_patch_copyops
nop
call cheetah_patch_cachetlbops
nop
ba,pt %xcc, tlb_fixup_done
nop
spitfire_tlb_fixup:
mov (63 << 3), %g7
ldxa [%g7] ASI_ITLB_DATA_ACCESS, %g1
andn %g1, (_PAGE_G), %g1
stxa %g1, [%g7] ASI_ITLB_DATA_ACCESS
membar #Sync
ldxa [%g7] ASI_DTLB_DATA_ACCESS, %g1
andn %g1, (_PAGE_G), %g1
stxa %g1, [%g7] ASI_DTLB_DATA_ACCESS
membar #Sync
/* Kill instruction prefetch queues. */
flush %g3
membar #Sync
/* Set TLB type to spitfire. */
mov 0, %g2
sethi %hi(tlb_type), %g1
stw %g2, [%g1 + %lo(tlb_type)]
tlb_fixup_done:
sethi %hi(init_thread_union), %g6
or %g6, %lo(init_thread_union), %g6
ldx [%g6 + TI_TASK], %g4
mov %sp, %l6
mov %o4, %l7
#if 0 /* We don't do it like this anymore, but for historical hack value
* I leave this snippet here to show how crazy we can be sometimes. 8-)
*/
/* Setup "Linux Current Register", thanks Sun 8-) */
wr %g0, 0x1, %pcr
/* Blackbird errata workaround. See commentary in
* smp.c:smp_percpu_timer_interrupt() for more
* information.
*/
ba,pt %xcc, 99f
nop
.align 64
99: wr %g6, %g0, %pic
rd %pic, %g0
#endif
wr %g0, ASI_P, %asi
mov 1, %g1
sllx %g1, THREAD_SHIFT, %g1
sub %g1, (STACKFRAME_SZ + STACK_BIAS), %g1
add %g6, %g1, %sp
mov 0, %fp
/* Set per-cpu pointer initially to zero, this makes
* the boot-cpu use the in-kernel-image per-cpu areas
* before setup_per_cpu_area() is invoked.
*/
clr %g5
wrpr %g0, 0, %wstate
wrpr %g0, 0x0, %tl
/* Clear the bss */
sethi %hi(__bss_start), %o0
or %o0, %lo(__bss_start), %o0
sethi %hi(_end), %o1
or %o1, %lo(_end), %o1
call __bzero
sub %o1, %o0, %o1
mov %l6, %o1 ! OpenPROM stack
call prom_init
mov %l7, %o0 ! OpenPROM cif handler
/* Off we go.... */
call start_kernel
nop
/* Not reached... */
/* IMPORTANT NOTE: Whenever making changes here, check
* trampoline.S as well. -jj */
.globl setup_tba
setup_tba: /* i0 = is_starfire */
save %sp, -160, %sp
rdpr %tba, %g7
sethi %hi(prom_tba), %o1
or %o1, %lo(prom_tba), %o1
stx %g7, [%o1]
/* Setup "Linux" globals 8-) */
rdpr %pstate, %o1
mov %g6, %o2
wrpr %o1, (PSTATE_AG|PSTATE_IE), %pstate
sethi %hi(sparc64_ttable_tl0), %g1
wrpr %g1, %tba
mov %o2, %g6
/* Set up MMU globals */
wrpr %o1, (PSTATE_MG|PSTATE_IE), %pstate
/* Set fixed globals used by dTLB miss handler. */
#define KERN_HIGHBITS ((_PAGE_VALID|_PAGE_SZ4MB)^0xfffff80000000000)
#define KERN_LOWBITS (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W)
mov TSB_REG, %g1
stxa %g0, [%g1] ASI_DMMU
membar #Sync
stxa %g0, [%g1] ASI_IMMU
membar #Sync
mov TLB_SFSR, %g1
sethi %uhi(KERN_HIGHBITS), %g2
or %g2, %ulo(KERN_HIGHBITS), %g2
sllx %g2, 32, %g2
or %g2, KERN_LOWBITS, %g2
BRANCH_IF_ANY_CHEETAH(g3,g7,cheetah_vpte_base)
ba,pt %xcc, spitfire_vpte_base
nop
cheetah_vpte_base:
sethi %uhi(VPTE_BASE_CHEETAH), %g3
or %g3, %ulo(VPTE_BASE_CHEETAH), %g3
ba,pt %xcc, 2f
sllx %g3, 32, %g3
spitfire_vpte_base:
sethi %uhi(VPTE_BASE_SPITFIRE), %g3
or %g3, %ulo(VPTE_BASE_SPITFIRE), %g3
sllx %g3, 32, %g3
2:
clr %g7
#undef KERN_HIGHBITS
#undef KERN_LOWBITS
/* Kill PROM timer */
sethi %hi(0x80000000), %o2
sllx %o2, 32, %o2
wr %o2, 0, %tick_cmpr
BRANCH_IF_ANY_CHEETAH(o2,o3,1f)
ba,pt %xcc, 2f
nop
/* Disable STICK_INT interrupts. */
1:
sethi %hi(0x80000000), %o2
sllx %o2, 32, %o2
wr %o2, %asr25
/* Ok, we're done setting up all the state our trap mechanims needs,
* now get back into normal globals and let the PROM know what is up.
*/
2:
wrpr %g0, %g0, %wstate
wrpr %o1, PSTATE_IE, %pstate
call init_irqwork_curcpu
nop
call prom_set_trap_table
sethi %hi(sparc64_ttable_tl0), %o0
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g2,g3,1f)
ba,pt %xcc, 2f
nop
1: /* Start using proper page size encodings in ctx register. */
sethi %uhi(CTX_CHEETAH_PLUS_NUC), %g3
mov PRIMARY_CONTEXT, %g1
sllx %g3, 32, %g3
sethi %hi(CTX_CHEETAH_PLUS_CTX0), %g2
or %g3, %g2, %g3
stxa %g3, [%g1] ASI_DMMU
membar #Sync
2:
rdpr %pstate, %o1
or %o1, PSTATE_IE, %o1
wrpr %o1, 0, %pstate
ret
restore
/*
* The following skips make sure the trap table in ttable.S is aligned
* on a 32K boundary as required by the v9 specs for TBA register.
*/
sparc64_boot_end:
.skip 0x2000 + _start - sparc64_boot_end
bootup_user_stack_end:
.skip 0x2000
#ifdef CONFIG_SBUS
/* This is just a hack to fool make depend config.h discovering
strategy: As the .S files below need config.h, but
make depend does not find it for them, we include config.h
in head.S */
#endif
! 0x0000000000408000
#include "ttable.S"
#include "systbls.S"
.align 1024
.globl swapper_pg_dir
swapper_pg_dir:
.word 0
#include "etrap.S"
#include "rtrap.S"
#include "winfixup.S"
#include "entry.S"
/* This is just anal retentiveness on my part... */
.align 16384
.data
.align 8
.globl prom_tba, tlb_type
prom_tba: .xword 0
tlb_type: .word 0 /* Must NOT end up in BSS */
.section ".fixup",#alloc,#execinstr
.globl __ret_efault
__ret_efault:
ret
restore %g0, -EFAULT, %o0
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