[PATCH] xtensa: remove extra header files

The Xtensa port contained many header files that were never needed.  This
rather lengthy patch removes all those files.  Unfortunately, there were
many dependencies that needed to be updated, so this patch touches quite a
few source files.

Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 37 insertions, 232 deletions

diff --git a/include/asm-xtensa/mmu_context.h b/include/asm-xtensa/mmu_context.h
index af683a74a4ec..f14851f086c3 100644
--- a/include/asm-xtensa/mmu_context.h
+++ b/include/asm-xtensa/mmu_context.h
@@ -16,187 +16,32 @@
 #include <linux/stringify.h>
 
 #include <asm/pgtable.h>
-#include <asm/mmu_context.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 
-/*
- * Linux was ported to Xtensa assuming all auto-refill ways in set 0
- * had the same properties (a very likely assumption).  Multiple sets
- * of auto-refill ways will still work properly, but not as optimally
- * as the Xtensa designer may have assumed.
- *
- * We make this case a hard #error, killing the kernel build, to alert
- * the developer to this condition (which is more likely an error).
- * You super-duper clever developers can change it to a warning or
- * remove it altogether if you think you know what you're doing.  :)
- */
+#define XCHAL_MMU_ASID_BITS     8
 
 #if (XCHAL_HAVE_TLBS != 1)
 # error "Linux must have an MMU!"
 #endif
 
-#if ((XCHAL_ITLB_ARF_WAYS == 0) || (XCHAL_DTLB_ARF_WAYS == 0))
-# error "MMU must have auto-refill ways"
-#endif
-
-#if ((XCHAL_ITLB_ARF_SETS != 1) || (XCHAL_DTLB_ARF_SETS != 1))
-# error Linux may not use all auto-refill ways as efficiently as you think
-#endif
-
-#if (XCHAL_MMU_MAX_PTE_PAGE_SIZE != XCHAL_MMU_MIN_PTE_PAGE_SIZE)
-# error Only one page size allowed!
-#endif
-
 extern unsigned long asid_cache;
-extern pgd_t *current_pgd;
-
-/*
- * Define the number of entries per auto-refill way in set 0 of both I and D
- * TLBs.  We deal only with set 0 here (an assumption further explained in
- * assertions.h).  Also, define the total number of ARF entries in both TLBs.
- */
-
-#define ITLB_ENTRIES_PER_ARF_WAY  (XCHAL_ITLB_SET(XCHAL_ITLB_ARF_SET0,ENTRIES))
-#define DTLB_ENTRIES_PER_ARF_WAY  (XCHAL_DTLB_SET(XCHAL_DTLB_ARF_SET0,ENTRIES))
-
-#define ITLB_ENTRIES                                                    \
-        (ITLB_ENTRIES_PER_ARF_WAY * (XCHAL_ITLB_SET(XCHAL_ITLB_ARF_SET0,WAYS)))
-#define DTLB_ENTRIES                                                    \
-        (DTLB_ENTRIES_PER_ARF_WAY * (XCHAL_DTLB_SET(XCHAL_DTLB_ARF_SET0,WAYS)))
-
-
-/*
- * SMALLEST_NTLB_ENTRIES is the smaller of ITLB_ENTRIES and DTLB_ENTRIES.
- * In practice, they are probably equal.  This macro simplifies function
- * flush_tlb_range().
- */
-
-#if (DTLB_ENTRIES < ITLB_ENTRIES)
-# define SMALLEST_NTLB_ENTRIES  DTLB_ENTRIES
-#else
-# define SMALLEST_NTLB_ENTRIES  ITLB_ENTRIES
-#endif
-
-
-/*
- * asid_cache tracks only the ASID[USER_RING] field of the RASID special
- * register, which is the current user-task asid allocation value.
- * mm->context has the same meaning.  When it comes time to write the
- * asid_cache or mm->context values to the RASID special register, we first
- * shift the value left by 8, then insert the value.
- * ASID[0] always contains the kernel's asid value, and we reserve three
- * other asid values that we never assign to user tasks.
- */
-
-#define ASID_INC        0x1
-#define ASID_MASK       ((1 << XCHAL_MMU_ASID_BITS) - 1)
-
-/*
- * XCHAL_MMU_ASID_INVALID is a configurable Xtensa processor constant
- * indicating invalid address space.  XCHAL_MMU_ASID_KERNEL is a configurable
- * Xtensa processor constant indicating the kernel address space.  They can
- * be arbitrary values.
- *
- * We identify three more unique, reserved ASID values to use in the unused
- * ring positions.  No other user process will be assigned these reserved
- * ASID values.
- *
- * For example, given that
- *
- *      XCHAL_MMU_ASID_INVALID == 0
- *      XCHAL_MMU_ASID_KERNEL  == 1
- *
- * the following maze of #if statements would generate
- *
- *      ASID_RESERVED_1        == 2
- *      ASID_RESERVED_2        == 3
- *      ASID_RESERVED_3        == 4
- *      ASID_FIRST_NONRESERVED == 5
- */
-
-#if (XCHAL_MMU_ASID_INVALID != XCHAL_MMU_ASID_KERNEL + 1)
-# define ASID_RESERVED_1         ((XCHAL_MMU_ASID_KERNEL + 1) & ASID_MASK)
-#else
-# define ASID_RESERVED_1         ((XCHAL_MMU_ASID_KERNEL + 2) & ASID_MASK)
-#endif
-
-#if (XCHAL_MMU_ASID_INVALID != ASID_RESERVED_1 + 1)
-# define ASID_RESERVED_2         ((ASID_RESERVED_1 + 1) & ASID_MASK)
-#else
-# define ASID_RESERVED_2         ((ASID_RESERVED_1 + 2) & ASID_MASK)
-#endif
-
-#if (XCHAL_MMU_ASID_INVALID != ASID_RESERVED_2 + 1)
-# define ASID_RESERVED_3         ((ASID_RESERVED_2 + 1) & ASID_MASK)
-#else
-# define ASID_RESERVED_3         ((ASID_RESERVED_2 + 2) & ASID_MASK)
-#endif
-
-#if (XCHAL_MMU_ASID_INVALID != ASID_RESERVED_3 + 1)
-# define ASID_FIRST_NONRESERVED  ((ASID_RESERVED_3 + 1) & ASID_MASK)
-#else
-# define ASID_FIRST_NONRESERVED  ((ASID_RESERVED_3 + 2) & ASID_MASK)
-#endif
-
-#define ASID_ALL_RESERVED ( ((ASID_RESERVED_1) << 24) + \
-                            ((ASID_RESERVED_2) << 16) + \
-                            ((ASID_RESERVED_3) <<  8) + \
-                            ((XCHAL_MMU_ASID_KERNEL))   )
-
 
 /*
  * NO_CONTEXT is the invalid ASID value that we don't ever assign to
- * any user or kernel context.  NO_CONTEXT is a better mnemonic than
- * XCHAL_MMU_ASID_INVALID, so we use it in code instead.
- */
-
-#define NO_CONTEXT   XCHAL_MMU_ASID_INVALID
-
-#if (KERNEL_RING != 0)
-# error The KERNEL_RING really should be zero.
-#endif
-
-#if (USER_RING >= XCHAL_MMU_RINGS)
-# error USER_RING cannot be greater than the highest numbered ring.
-#endif
-
-#if (USER_RING == KERNEL_RING)
-# error The user and kernel rings really should not be equal.
-#endif
-
-#if (USER_RING == 1)
-#define ASID_INSERT(x) ( ((ASID_RESERVED_1)   << 24) + \
-                         ((ASID_RESERVED_2)   << 16) + \
-                         (((x) & (ASID_MASK)) <<  8) + \
-                         ((XCHAL_MMU_ASID_KERNEL))   )
-
-#elif (USER_RING == 2)
-#define ASID_INSERT(x) ( ((ASID_RESERVED_1)   << 24) + \
-                         (((x) & (ASID_MASK)) << 16) + \
-                         ((ASID_RESERVED_2)   <<  8) + \
-                         ((XCHAL_MMU_ASID_KERNEL))   )
-
-#elif (USER_RING == 3)
-#define ASID_INSERT(x) ( (((x) & (ASID_MASK)) << 24) + \
-                         ((ASID_RESERVED_1)   << 16) + \
-                         ((ASID_RESERVED_2)   <<  8) + \
-                         ((XCHAL_MMU_ASID_KERNEL))   )
-
-#else
-#error Goofy value for USER_RING
-
-#endif /* USER_RING == 1 */
-
-
-/*
- *  All unused by hardware upper bits will be considered
- *  as a software asid extension.
+ * any user or kernel context.
+ *
+ * 0 invalid
+ * 1 kernel
+ * 2 reserved
+ * 3 reserved
+ * 4...255 available
  */
 
-#define ASID_VERSION_MASK  ((unsigned long)~(ASID_MASK|(ASID_MASK-1)))
-#define ASID_FIRST_VERSION                                              \
-        ((unsigned long)(~ASID_VERSION_MASK) + 1 + ASID_FIRST_NONRESERVED)
+#define NO_CONTEXT      0
+#define ASID_USER_FIRST 4
+#define ASID_MASK       ((1 << XCHAL_MMU_ASID_BITS) - 1)
+#define ASID_INSERT(x)  (0x03020001 | (((x) & ASID_MASK) << 8))
 
 static inline void set_rasid_register (unsigned long val)
 {
@@ -207,67 +52,28 @@ static inline void set_rasid_register (unsigned long val)
 static inline unsigned long get_rasid_register (void)
 {
         unsigned long tmp;
-        __asm__ __volatile__ (" rsr %0, "__stringify(RASID)"\n\t" : "=a" (tmp));
+        __asm__ __volatile__ (" rsr %0,"__stringify(RASID)"\n\t" : "=a" (tmp));
         return tmp;
 }
 
-
-#if ((XCHAL_MMU_ASID_INVALID == 0) && (XCHAL_MMU_ASID_KERNEL == 1))
-
 static inline void
-get_new_mmu_context(struct mm_struct *mm, unsigned long asid)
+__get_new_mmu_context(struct mm_struct *mm)
 {
         extern void flush_tlb_all(void);
-        if (! ((asid += ASID_INC) & ASID_MASK) ) {
+        if (! (++asid_cache & ASID_MASK) ) {
                 flush_tlb_all(); /* start new asid cycle */
-                if (!asid)      /* fix version if needed */
-                        asid = ASID_FIRST_VERSION - ASID_FIRST_NONRESERVED;
-                asid += ASID_FIRST_NONRESERVED;
+                asid_cache += ASID_USER_FIRST;
         }
-        mm->context = asid_cache = asid;
-}
-
-#else
-#warning ASID_{INVALID,KERNEL} values impose non-optimal get_new_mmu_context implementation
-
-/* XCHAL_MMU_ASID_INVALID == 0 and XCHAL_MMU_ASID_KERNEL ==1 are
-   really the best, but if you insist... */
-
-static inline int validate_asid (unsigned long asid)
-{
-        switch (asid) {
-        case XCHAL_MMU_ASID_INVALID:
-        case XCHAL_MMU_ASID_KERNEL:
-        case ASID_RESERVED_1:
-        case ASID_RESERVED_2:
-        case ASID_RESERVED_3:
-                return 0; /* can't use these values as ASIDs */
-        }
-        return 1; /* valid */
+        mm->context = asid_cache;
 }
 
 static inline void
-get_new_mmu_context(struct mm_struct *mm, unsigned long asid)
+__load_mmu_context(struct mm_struct *mm)
 {
-        extern void flush_tlb_all(void);
-        while (1) {
-                asid += ASID_INC;
-                if ( ! (asid & ASID_MASK) ) {
-                        flush_tlb_all(); /* start new asid cycle */
-                        if (!asid)      /* fix version if needed */
-                                asid = ASID_FIRST_VERSION - ASID_FIRST_NONRESERVED;
-                        asid += ASID_FIRST_NONRESERVED;
-                        break; /* no need to validate here */
-                }
-                if (validate_asid (asid & ASID_MASK))
-                        break;
-        }
-        mm->context = asid_cache = asid;
+        set_rasid_register(ASID_INSERT(mm->context));
+        invalidate_page_directory();
 }
 
-#endif
-
-
 /*
  * Initialize the context related info for a new mm_struct
  * instance.
@@ -280,6 +86,20 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
         return 0;
 }
 
+/*
+ * After we have set current->mm to a new value, this activates
+ * the context for the new mm so we see the new mappings.
+ */
+static inline void
+activate_mm(struct mm_struct *prev, struct mm_struct *next)
+{
+        /* Unconditionally get a new ASID.  */
+
+        __get_new_mmu_context(next);
+        __load_mmu_context(next);
+}
+
+
 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
                              struct task_struct *tsk)
 {
@@ -287,11 +107,10 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 
         /* Check if our ASID is of an older version and thus invalid */
 
-        if ((next->context ^ asid) & ASID_VERSION_MASK)
-                get_new_mmu_context(next, asid);
+        if (next->context == NO_CONTEXT || ((next->context^asid) & ~ASID_MASK))
+                __get_new_mmu_context(next);
 
-        set_rasid_register (ASID_INSERT(next->context));
-        invalidate_page_directory();
+        __load_mmu_context(next);
 }
 
 #define deactivate_mm(tsk, mm)  do { } while(0)
@@ -302,20 +121,6 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  */
 static inline void destroy_context(struct mm_struct *mm)
 {
-        /* Nothing to do. */
-}
-
-/*
- * After we have set current->mm to a new value, this activates
- * the context for the new mm so we see the new mappings.
- */
-static inline void
-activate_mm(struct mm_struct *prev, struct mm_struct *next)
-{
-        /* Unconditionally get a new ASID.  */
-
-        get_new_mmu_context(next, asid_cache);
-        set_rasid_register (ASID_INSERT(next->context));
         invalidate_page_directory();
 }