#include <asm/head.h>
#include <asm/ttable.h>
#include <asm/mmu.h>
+#include <asm/cpudata.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.
+ * 0x0000000000404000 to 0x0000000000408000.
*/
-
.text
.globl start, _start, stext, _stext
_start:
start:
_stext:
stext:
-bootup_user_stack:
! 0x0000000000404000
b sparc64_boot
flushw /* Flush register file. */
* former does use this code, the latter does not yet due
* to some complexities. That should be fixed up at some
* point.
+ *
+ * There used to be enormous complexity wrt. transferring
+ * over from the firwmare's trap table to the Linux kernel's.
+ * For example, there was a chicken & egg problem wrt. building
+ * the OBP page tables, yet needing to be on the Linux kernel
+ * trap table (to translate PAGE_OFFSET addresses) in order to
+ * do that.
+ *
+ * We now handle OBP tlb misses differently, via linear lookups
+ * into the prom_trans[] array. So that specific problem no
+ * longer exists. Yet, unfortunately there are still some issues
+ * preventing trampoline.S from using this code... ho hum.
*/
.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.
- */
+ /* Force interrupts to be disabled. */
rdpr %pstate, %o1
andn %o1, PSTATE_IE, %o1
wrpr %o1, 0x0, %pstate
wrpr %g0, 15, %pil
- /* Ok, now make the final valid firmware call to jump over
- * to the Linux trap table.
- */
+ /* Make the firmware call to jump over to the Linux trap table. */
call prom_set_trap_table
sethi %hi(sparc64_ttable_tl0), %o0
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()]
- */
-
- rdpr %pstate, %o1
- mov %g6, %o2
- wrpr %o1, PSTATE_AG, %pstate
- mov %o2, %g6
-
-#define KERN_HIGHBITS ((_PAGE_VALID|_PAGE_SZ4MB)^0xfffff80000000000)
-#define KERN_LOWBITS (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W)
- wrpr %o1, PSTATE_MG, %pstate
- 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,g7,8f)
- ba,pt %xcc, 9f
- nop
-
-8:
- sethi %uhi(VPTE_BASE_CHEETAH), %g3
- or %g3, %ulo(VPTE_BASE_CHEETAH), %g3
- ba,pt %xcc, 2f
- sllx %g3, 32, %g3
-
-9:
- 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
2:
wrpr %g0, %g0, %wstate
- wrpr %o1, 0x0, %pstate
call init_irqwork_curcpu
nop
ret
restore
+sparc64_boot_end:
+
+#include "systbls.S"
+#include "ktlb.S"
+#include "tsb.S"
+#include "etrap.S"
+#include "rtrap.S"
+#include "winfixup.S"
+#include "entry.S"
/*
- * The following skips make sure the trap table in ttable.S is aligned
+ * The following skip makes 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
+1:
+ .skip 0x4000 + _start - 1b
#ifdef CONFIG_SBUS
/* This is just a hack to fool make depend config.h discovering
! 0x0000000000408000
#include "ttable.S"
-#include "systbls.S"
-#include "ktlb.S"
-#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
projects / linux-2.6 / blobdiff