diff options
| author | David S. Miller <davem@davemloft.net> | 2006-01-31 18:31:20 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-03-20 01:11:17 -0800 |
| commit | 98c5584cfc47932c4f3ccf5eee2e0bae1447b85e (patch) | |
| tree | c067ac8bfc081bbe0b3073374cb15708458e04ab /arch/sparc64/kernel/tsb.S | |
| parent | 09f94287f7260e03bbeab497e743691fafcc22c3 (diff) | |
[SPARC64]: Add infrastructure for dynamic TSB sizing.
This also cleans up tsb_context_switch(). The assembler
routine is now __tsb_context_switch() and the former is
an inline function that picks out the bits from the mm_struct
and passes it into the assembler code as arguments.
setup_tsb_parms() computes the locked TLB entry to map the
TSB. Later when we support using the physical address quad
load instructions of Cheetah+ and later, we'll simply use
the physical address for the TSB register value and set
the map virtual and PTE both to zero.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/tsb.S')
| -rw-r--r-- | arch/sparc64/kernel/tsb.S | 55 |
1 files changed, 21 insertions, 34 deletions
diff --git a/arch/sparc64/kernel/tsb.S b/arch/sparc64/kernel/tsb.S index 76f2c0b01f36..fe266bad0a28 100644 --- a/arch/sparc64/kernel/tsb.S +++ b/arch/sparc64/kernel/tsb.S @@ -130,48 +130,36 @@ winfix_trampoline: * schedule() time. * * %o0: page table physical address - * %o1: TSB address + * %o1: TSB register value + * %o2: TSB virtual address + * %o3: TSB mapping locked PTE + * + * We have to run this whole thing with interrupts + * disabled so that the current cpu doesn't change + * due to preemption. */ .align 32 - .globl tsb_context_switch -tsb_context_switch: + .globl __tsb_context_switch +__tsb_context_switch: rdpr %pstate, %o5 wrpr %o5, PSTATE_IE, %pstate - ldub [%g6 + TI_CPU], %o3 - sethi %hi(trap_block), %o4 - sllx %o3, TRAP_BLOCK_SZ_SHIFT, %o3 - or %o4, %lo(trap_block), %o4 - add %o4, %o3, %o4 - stx %o0, [%o4 + TRAP_PER_CPU_PGD_PADDR] - - brgez %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 + ldub [%g6 + TI_CPU], %g1 + sethi %hi(trap_block), %g2 + sllx %g1, TRAP_BLOCK_SZ_SHIFT, %g1 + or %g2, %lo(trap_block), %g2 + add %g2, %g1, %g2 + stx %o0, [%g2 + TRAP_PER_CPU_PGD_PADDR] - /* XXX handle PAGE_SIZE != 8K correctly... */ mov TSB_REG, %g1 - stxa %o2, [%g1] ASI_DMMU + stxa %o1, [%g1] ASI_DMMU membar #Sync - stxa %o2, [%g1] ASI_IMMU + stxa %o1, [%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 + brz %o2, 9f + nop /* We use entry 61 for this locked entry. This is the spitfire * TLB entry number, and luckily cheetah masks the value with @@ -184,11 +172,10 @@ tsb_context_switch: stxa %o2, [%g1] ASI_DMMU membar #Sync mov (61 << 3), %g1 - stxa %o1, [%g1] ASI_DTLB_DATA_ACCESS + stxa %o3, [%g1] ASI_DTLB_DATA_ACCESS membar #Sync - 9: wrpr %o5, %pstate retl - mov %o2, %o0 + nop |