[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>

3 files changed, 24 insertions, 6 deletions

diff --git a/include/asm-sparc64/mmu.h b/include/asm-sparc64/mmu.h
index 36384cf7faa6..2effeba2476c 100644
--- a/include/asm-sparc64/mmu.h
+++ b/include/asm-sparc64/mmu.h
@@ -90,9 +90,20 @@
 
 #ifndef __ASSEMBLY__
 
+#define TSB_ENTRY_ALIGNMENT     16
+
+struct tsb {
+        unsigned long tag;
+        unsigned long pte;
+} __attribute__((aligned(TSB_ENTRY_ALIGNMENT)));
+
 typedef struct {
         unsigned long   sparc64_ctx_val;
-        unsigned long   *sparc64_tsb;
+        struct tsb      *tsb;
+        unsigned long   tsb_nentries;
+        unsigned long   tsb_reg_val;
+        unsigned long   tsb_map_vaddr;
+        unsigned long   tsb_map_pte;
 } mm_context_t;
 
 #endif /* !__ASSEMBLY__ */
diff --git a/include/asm-sparc64/mmu_context.h b/include/asm-sparc64/mmu_context.h
index 0dffb4ce8a1d..0a950f151d2b 100644
--- a/include/asm-sparc64/mmu_context.h
+++ b/include/asm-sparc64/mmu_context.h
@@ -22,7 +22,15 @@ extern void get_new_mmu_context(struct mm_struct *mm);
 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
 extern void destroy_context(struct mm_struct *mm);
 
-extern unsigned long tsb_context_switch(unsigned long pgd_pa, unsigned long *tsb);
+extern void __tsb_context_switch(unsigned long pgd_pa, unsigned long tsb_reg,
+                                 unsigned long tsb_vaddr, unsigned long tsb_pte);
+
+static inline void tsb_context_switch(struct mm_struct *mm)
+{
+        __tsb_context_switch(__pa(mm->pgd), mm->context.tsb_reg_val,
+                             mm->context.tsb_map_vaddr,
+                             mm->context.tsb_map_pte);
+}
 
 /* Set MMU context in the actual hardware. */
 #define load_secondary_context(__mm) \
@@ -52,8 +60,7 @@ static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, str
 
         if (!ctx_valid || (old_mm != mm)) {
                 load_secondary_context(mm);
-                tsb_context_switch(__pa(mm->pgd),
-                                   mm->context.sparc64_tsb);
+                tsb_context_switch(mm);
         }
 
         /* Even if (mm == old_mm) we _must_ check
@@ -91,7 +98,7 @@ static inline void activate_mm(struct mm_struct *active_mm, struct mm_struct *mm
 
         load_secondary_context(mm);
         __flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT);
-        tsb_context_switch(__pa(mm->pgd), mm->context.sparc64_tsb);
+        tsb_context_switch(mm);
 }
 
 #endif /* !(__ASSEMBLY__) */
diff --git a/include/asm-sparc64/tsb.h b/include/asm-sparc64/tsb.h
index 03d272e0e477..1f93b7d8cdbc 100644
--- a/include/asm-sparc64/tsb.h
+++ b/include/asm-sparc64/tsb.h
@@ -19,7 +19,7 @@
  *      stxa            %g5, [%g0] ASI_{D,I}TLB_DATA_IN
  *      retry
  *
-
+ *
  * Each 16-byte slot of the TSB is the 8-byte tag and then the 8-byte
  * PTE.  The TAG is of the same layout as the TLB TAG TARGET mmu
  * register which is: