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/* tsb.S: Sparc64 TSB table handling.
*
* Copyright (C) 2006 David S. Miller <davem@davemloft.net>
*/
#include <asm/tsb.h>
.text
.align 32
/* Invoked from TLB miss handler, we are in the
* MMU global registers and they are setup like
* this:
*
* %g1: TSB entry pointer
* %g2: available temporary
* %g3: FAULT_CODE_{D,I}TLB
* %g4: available temporary
* %g5: available temporary
* %g6: TAG TARGET
* %g7: physical address base of the linux page
* tables for the current address space
*/
.globl tsb_miss_dtlb
tsb_miss_dtlb:
mov TLB_TAG_ACCESS, %g4
ldxa [%g4] ASI_DMMU, %g4
ba,pt %xcc, tsb_miss_page_table_walk
nop
.globl tsb_miss_itlb
tsb_miss_itlb:
mov TLB_TAG_ACCESS, %g4
ldxa [%g4] ASI_IMMU, %g4
ba,pt %xcc, tsb_miss_page_table_walk
nop
tsb_miss_page_table_walk:
USER_PGTABLE_WALK_TL1(%g4, %g7, %g5, %g2, tsb_do_fault)
tsb_reload:
TSB_LOCK_TAG(%g1, %g2, %g4)
/* Load and check PTE. */
ldxa [%g5] ASI_PHYS_USE_EC, %g5
brgez,a,pn %g5, tsb_do_fault
stx %g0, [%g1]
TSB_WRITE(%g1, %g5, %g6)
/* Finally, load TLB and return from trap. */
tsb_tlb_reload:
cmp %g3, FAULT_CODE_DTLB
bne,pn %xcc, tsb_itlb_load
nop
tsb_dtlb_load:
stxa %g5, [%g0] ASI_DTLB_DATA_IN
retry
tsb_itlb_load:
stxa %g5, [%g0] ASI_ITLB_DATA_IN
retry
/* No valid entry in the page tables, do full fault
* processing.
*/
.globl tsb_do_fault
tsb_do_fault:
cmp %g3, FAULT_CODE_DTLB
rdpr %pstate, %g5
bne,pn %xcc, tsb_do_itlb_fault
wrpr %g5, PSTATE_AG | PSTATE_MG, %pstate
tsb_do_dtlb_fault:
rdpr %tl, %g4
cmp %g4, 1
mov TLB_TAG_ACCESS, %g4
ldxa [%g4] ASI_DMMU, %g5
be,pt %xcc, sparc64_realfault_common
mov FAULT_CODE_DTLB, %g4
ba,pt %xcc, winfix_trampoline
nop
tsb_do_itlb_fault:
rdpr %tpc, %g5
ba,pt %xcc, sparc64_realfault_common
mov FAULT_CODE_ITLB, %g4
.globl sparc64_realfault_common
sparc64_realfault_common:
stb %g4, [%g6 + TI_FAULT_CODE] ! Save fault code
stx %g5, [%g6 + TI_FAULT_ADDR] ! Save fault address
ba,pt %xcc, etrap ! Save trap state
1: rd %pc, %g7 ! ...
call do_sparc64_fault ! Call fault handler
add %sp, PTREGS_OFF, %o0 ! Compute pt_regs arg
ba,pt %xcc, rtrap_clr_l6 ! Restore cpu state
nop ! Delay slot (fill me)
.globl winfix_trampoline
winfix_trampoline:
rdpr %tpc, %g3 ! Prepare winfixup TNPC
or %g3, 0x7c, %g3 ! Compute branch offset
wrpr %g3, %tnpc ! Write it into TNPC
done ! Trap return
/* Reload MMU related context switch state at
* schedule() time.
*
* %o0: page table physical address
* %o1: TSB address
*/
.globl tsb_context_switch
tsb_context_switch:
wrpr %g0, PSTATE_MG | PSTATE_RMO | PSTATE_PEF | PSTATE_PRIV, %pstate
/* Set page table base alternate global. */
mov %o0, %g7
/* XXX can this happen? */
brz,pn %o1, 9f
nop
/* Lock TSB into D-TLB. */
sethi %hi(PAGE_SIZE), %o3
and %o3, %o1, %o3
sethi %hi(TSBMAP_BASE), %o2
add %o2, %o3, %o2
/* XXX handle PAGE_SIZE != 8K correctly... */
mov TSB_REG, %g1
stxa %o2, [%g1] ASI_DMMU
membar #Sync
stxa %o2, [%g1] ASI_IMMU
membar #Sync
#define KERN_HIGHBITS ((_PAGE_VALID|_PAGE_SZBITS)^0xfffff80000000000)
#define KERN_LOWBITS (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W | _PAGE_L)
sethi %uhi(KERN_HIGHBITS), %g2
or %g2, %ulo(KERN_HIGHBITS), %g2
sllx %g2, 32, %g2
or %g2, KERN_LOWBITS, %g2
#undef KERN_HIGHBITS
#undef KERN_LOWBITS
xor %o1, %g2, %o1
/* We use entry 61 for this locked entry. This is the spitfire
* TLB entry number, and luckily cheetah masks the value with
* 15 ending us up with entry 13 which is what we want in that
* case too.
*
* XXX Interactions with prom_world()...
*/
mov TLB_TAG_ACCESS, %g1
stxa %o2, [%g1] ASI_DMMU
membar #Sync
mov (61 << 3), %g1
stxa %o1, [%g1] ASI_DTLB_DATA_ACCESS
membar #Sync
9:
wrpr %g0, PSTATE_RMO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE, %pstate
retl
mov %o2, %o0
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