提交 af74c3a6 编写于 作者: L Linus Torvalds

Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6

...@@ -382,32 +382,79 @@ tlb_fixup_done: ...@@ -382,32 +382,79 @@ tlb_fixup_done:
nop nop
/* Not reached... */ /* Not reached... */
/* IMPORTANT NOTE: Whenever making changes here, check /* This is meant to allow the sharing of this code between
* trampoline.S as well. -jj */ * boot processor invocation (via setup_tba() below) and
.globl setup_tba * secondary processor startup (via trampoline.S). The
setup_tba: /* i0 = is_starfire */ * former does use this code, the latter does not yet due
save %sp, -160, %sp * to some complexities. That should be fixed up at some
* point.
*/
.globl setup_trap_table
setup_trap_table:
save %sp, -192, %sp
/* Force interrupts to be disabled. Transferring over to
* the Linux trap table is a very delicate operation.
* Until we are actually on the Linux trap table, we cannot
* get the PAGE_OFFSET linear mappings translated. We need
* that mapping to be setup in order to initialize the firmware
* page tables.
*
* So there is this window of time, from the return from
* prom_set_trap_table() until inherit_prom_mappings_post()
* (in arch/sparc64/mm/init.c) completes, during which no
* firmware address space accesses can be made.
*/
rdpr %pstate, %o1
andn %o1, PSTATE_IE, %o1
wrpr %o1, 0x0, %pstate
wrpr %g0, 15, %pil
rdpr %tba, %g7 /* Ok, now make the final valid firmware call to jump over
sethi %hi(prom_tba), %o1 * to the Linux trap table.
or %o1, %lo(prom_tba), %o1 */
stx %g7, [%o1] call prom_set_trap_table
sethi %hi(sparc64_ttable_tl0), %o0
/* Start using proper page size encodings in ctx register. */
sethi %hi(sparc64_kern_pri_context), %g3
ldx [%g3 + %lo(sparc64_kern_pri_context)], %g2
mov PRIMARY_CONTEXT, %g1
stxa %g2, [%g1] ASI_DMMU
membar #Sync
/* The Linux trap handlers expect various trap global registers
* to be setup with some fixed values. So here we set these
* up very carefully. These globals are:
*
* Alternate Globals (PSTATE_AG):
*
* %g6 --> current_thread_info()
*
* MMU Globals (PSTATE_MG):
*
* %g1 --> TLB_SFSR
* %g2 --> ((_PAGE_VALID | _PAGE_SZ4MB |
* _PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W)
* ^ 0xfffff80000000000)
* (this %g2 value is used for computing the PAGE_OFFSET kernel
* TLB entries quickly, the virtual address of the fault XOR'd
* with this %g2 value is the PTE to load into the TLB)
* %g3 --> VPTE_BASE_CHEETAH or VPTE_BASE_SPITFIRE
*
* Interrupt Globals (PSTATE_IG, setup by init_irqwork_curcpu()):
*
* %g6 --> __irq_work[smp_processor_id()]
*/
/* Setup "Linux" globals 8-) */
rdpr %pstate, %o1 rdpr %pstate, %o1
mov %g6, %o2 mov %g6, %o2
wrpr %o1, (PSTATE_AG|PSTATE_IE), %pstate wrpr %o1, PSTATE_AG, %pstate
sethi %hi(sparc64_ttable_tl0), %g1
wrpr %g1, %tba
mov %o2, %g6 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_HIGHBITS ((_PAGE_VALID|_PAGE_SZ4MB)^0xfffff80000000000)
#define KERN_LOWBITS (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W) #define KERN_LOWBITS (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W)
wrpr %o1, PSTATE_MG, %pstate
mov TSB_REG, %g1 mov TSB_REG, %g1
stxa %g0, [%g1] ASI_DMMU stxa %g0, [%g1] ASI_DMMU
membar #Sync membar #Sync
...@@ -419,17 +466,17 @@ setup_tba: /* i0 = is_starfire */ ...@@ -419,17 +466,17 @@ setup_tba: /* i0 = is_starfire */
sllx %g2, 32, %g2 sllx %g2, 32, %g2
or %g2, KERN_LOWBITS, %g2 or %g2, KERN_LOWBITS, %g2
BRANCH_IF_ANY_CHEETAH(g3,g7,cheetah_vpte_base) BRANCH_IF_ANY_CHEETAH(g3,g7,8f)
ba,pt %xcc, spitfire_vpte_base ba,pt %xcc, 9f
nop nop
cheetah_vpte_base: 8:
sethi %uhi(VPTE_BASE_CHEETAH), %g3 sethi %uhi(VPTE_BASE_CHEETAH), %g3
or %g3, %ulo(VPTE_BASE_CHEETAH), %g3 or %g3, %ulo(VPTE_BASE_CHEETAH), %g3
ba,pt %xcc, 2f ba,pt %xcc, 2f
sllx %g3, 32, %g3 sllx %g3, 32, %g3
spitfire_vpte_base: 9:
sethi %uhi(VPTE_BASE_SPITFIRE), %g3 sethi %uhi(VPTE_BASE_SPITFIRE), %g3
or %g3, %ulo(VPTE_BASE_SPITFIRE), %g3 or %g3, %ulo(VPTE_BASE_SPITFIRE), %g3
sllx %g3, 32, %g3 sllx %g3, 32, %g3
...@@ -455,29 +502,37 @@ spitfire_vpte_base: ...@@ -455,29 +502,37 @@ spitfire_vpte_base:
sllx %o2, 32, %o2 sllx %o2, 32, %o2
wr %o2, %asr25 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: 2:
wrpr %g0, %g0, %wstate wrpr %g0, %g0, %wstate
wrpr %o1, PSTATE_IE, %pstate wrpr %o1, 0x0, %pstate
call init_irqwork_curcpu call init_irqwork_curcpu
nop nop
call prom_set_trap_table /* Now we can turn interrupts back on. */
sethi %hi(sparc64_ttable_tl0), %o0
/* Start using proper page size encodings in ctx register. */
sethi %hi(sparc64_kern_pri_context), %g3
ldx [%g3 + %lo(sparc64_kern_pri_context)], %g2
mov PRIMARY_CONTEXT, %g1
stxa %g2, [%g1] ASI_DMMU
membar #Sync
rdpr %pstate, %o1 rdpr %pstate, %o1
or %o1, PSTATE_IE, %o1 or %o1, PSTATE_IE, %o1
wrpr %o1, 0, %pstate wrpr %o1, 0, %pstate
wrpr %g0, 0x0, %pil
ret
restore
.globl setup_tba
setup_tba: /* i0 = is_starfire */
save %sp, -192, %sp
/* The boot processor is the only cpu which invokes this
* routine, the other cpus set things up via trampoline.S.
* So save the OBP trap table address here.
*/
rdpr %tba, %g7
sethi %hi(prom_tba), %o1
or %o1, %lo(prom_tba), %o1
stx %g7, [%o1]
call setup_trap_table
nop
ret ret
restore restore
......
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