sh: Fix up extended mode TLB for SH-X2+ cores.

The extended mode TLB requires both 64-bit PTEs and a 64-bit pgprot,
correspondingly, the PGD also has to be 64-bits, so fix that up.

The kernel and user permission bits really are decoupled in early
cuts of the silicon, which means that we also have to set corresponding
kernel permissions on user pages or we end up with user pages that the
kernel simply can't touch (!).

Finally, with those things corrected, really enable MMUCR.ME and
correct the PTEA value (this simply needs to be the upper 32-bits
of the PTE, with the size and protection bit encoding).

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 62 insertions, 50 deletions

diff --git a/include/asm-sh/pgtable.h b/include/asm-sh/pgtable.h
index 54ad5037fe40..cf0dd2b648c2 100644
--- a/include/asm-sh/pgtable.h
+++ b/include/asm-sh/pgtable.h
@@ -42,13 +42,12 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 
 /* PGD bits */
 #define PGDIR_SHIFT     (PTE_SHIFT + PTE_BITS)
-#define PGDIR_BITS      (32 - PGDIR_SHIFT)
 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
 
 /* Entries per level */
 #define PTRS_PER_PTE    (PAGE_SIZE / (1 << PTE_MAGNITUDE))
-#define PTRS_PER_PGD    (PAGE_SIZE / 4)
+#define PTRS_PER_PGD    (PAGE_SIZE / sizeof(pgd_t))
 
 #define USER_PTRS_PER_PGD       (TASK_SIZE/PGDIR_SIZE)
 #define FIRST_USER_ADDRESS      0
@@ -100,17 +99,18 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 #define _PAGE_HW_SHARED 0x002           /* SH-bit  : shared among processes */
 #define _PAGE_DIRTY     0x004           /* D-bit   : page changed */
 #define _PAGE_CACHABLE  0x008           /* C-bit   : cachable */
-#ifndef CONFIG_X2TLB
-# define _PAGE_SZ0      0x010           /* SZ0-bit : Size of page */
-# define _PAGE_RW       0x020           /* PR0-bit : write access allowed */
-# define _PAGE_USER     0x040           /* PR1-bit : user space access allowed*/
-# define _PAGE_SZ1      0x080           /* SZ1-bit : Size of page (on SH-4) */
-#endif
+#define _PAGE_SZ0       0x010           /* SZ0-bit : Size of page */
+#define _PAGE_RW        0x020           /* PR0-bit : write access allowed */
+#define _PAGE_USER      0x040           /* PR1-bit : user space access allowed*/
+#define _PAGE_SZ1       0x080           /* SZ1-bit : Size of page (on SH-4) */
 #define _PAGE_PRESENT   0x100           /* V-bit   : page is valid */
 #define _PAGE_PROTNONE  0x200           /* software: if not present  */
 #define _PAGE_ACCESSED  0x400           /* software: page referenced */
 #define _PAGE_FILE      _PAGE_WT        /* software: pagecache or swap? */
 
+#define _PAGE_SZ_MASK   (_PAGE_SZ0 | _PAGE_SZ1)
+#define _PAGE_PR_MASK   (_PAGE_RW | _PAGE_USER)
+
 /* Extended mode bits */
 #define _PAGE_EXT_ESZ0          0x0010  /* ESZ0-bit: Size of page */
 #define _PAGE_EXT_ESZ1          0x0020  /* ESZ1-bit: Size of page */
@@ -126,11 +126,7 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 #define _PAGE_EXT_KERN_READ     0x2000  /* EPR5-bit: Kernel space readable */
 
 /* Wrapper for extended mode pgprot twiddling */
-#ifdef CONFIG_X2TLB
-# define _PAGE_EXT(x)           ((unsigned long long)(x) << 32)
-#else
-# define _PAGE_EXT(x)           (0)
-#endif
+#define _PAGE_EXT(x)            ((unsigned long long)(x) << 32)
 
 /* software: moves to PTEA.TC (Timing Control) */
 #define _PAGE_PCC_AREA5 0x00000000      /* use BSC registers for area5 */
@@ -146,10 +142,14 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 #define _PAGE_PCC_ATR16 0x60000001      /* Attribute Memory space, 6 bit bus */
 
 /* Mask which drops unused bits from the PTEL value */
-#ifdef CONFIG_CPU_SH3
+#if defined(CONFIG_CPU_SH3)
 #define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED| \
                                  _PAGE_FILE     | _PAGE_SZ1     | \
                                  _PAGE_HW_SHARED)
+#elif defined(CONFIG_X2TLB)
+/* Get rid of the legacy PR/SZ bits when using extended mode */
+#define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED | \
+                                 _PAGE_FILE | _PAGE_PR_MASK | _PAGE_SZ_MASK)
 #else
 #define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE)
 #endif
@@ -212,27 +212,36 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 
 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
-                                 _PAGE_EXT(_PAGE_EXT_USER_READ | \
+                                 _PAGE_EXT(_PAGE_EXT_KERN_READ  | \
+                                           _PAGE_EXT_KERN_WRITE | \
+                                           _PAGE_EXT_USER_READ  | \
                                            _PAGE_EXT_USER_WRITE))
 
 #define PAGE_EXECREAD   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
-                                 _PAGE_EXT(_PAGE_EXT_USER_EXEC | \
+                                 _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \
+                                           _PAGE_EXT_KERN_READ | \
+                                           _PAGE_EXT_USER_EXEC | \
                                            _PAGE_EXT_USER_READ))
 
 #define PAGE_COPY       PAGE_EXECREAD
 
 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
-                                 _PAGE_EXT(_PAGE_EXT_USER_READ))
+                                 _PAGE_EXT(_PAGE_EXT_KERN_READ | \
+                                           _PAGE_EXT_USER_READ))
 
 #define PAGE_WRITEONLY  __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
-                                 _PAGE_EXT(_PAGE_EXT_USER_WRITE))
+                                 _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
+                                           _PAGE_EXT_USER_WRITE))
 
 #define PAGE_RWX        __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
-                                 _PAGE_EXT(_PAGE_EXT_USER_WRITE | \
+                                 _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
+                                           _PAGE_EXT_KERN_READ  | \
+                                           _PAGE_EXT_KERN_EXEC  | \
+                                           _PAGE_EXT_USER_WRITE | \
                                            _PAGE_EXT_USER_READ  | \
                                            _PAGE_EXT_USER_EXEC))
 
@@ -373,11 +382,15 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
 
 #define pte_pfn(x)              ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
-#define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
-#define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 
-#define pte_none(x)     (!pte_val(x))
-#define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
+#define pfn_pte(pfn, prot) \
+        __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
+#define pfn_pmd(pfn, prot) \
+        __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
+
+#define pte_none(x)             (!pte_val(x))
+#define pte_present(x)          ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE))
+
 #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 
 #define pmd_none(x)     (!pmd_val(x))
@@ -392,15 +405,15 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
  */
-#define pte_not_present(pte)    (!(pte_val(pte) & _PAGE_PRESENT))
-#define pte_dirty(pte)          (pte_val(pte) & _PAGE_DIRTY)
-#define pte_young(pte)          (pte_val(pte) & _PAGE_ACCESSED)
-#define pte_file(pte)           (pte_val(pte) & _PAGE_FILE)
+#define pte_not_present(pte)    (!((pte).pte_low & _PAGE_PRESENT))
+#define pte_dirty(pte)          ((pte).pte_low & _PAGE_DIRTY)
+#define pte_young(pte)          ((pte).pte_low & _PAGE_ACCESSED)
+#define pte_file(pte)           ((pte).pte_low & _PAGE_FILE)
 
 #ifdef CONFIG_X2TLB
 #define pte_write(pte)          ((pte).pte_high & _PAGE_EXT_USER_WRITE)
 #else
-#define pte_write(pte)          (pte_val(pte) & _PAGE_RW)
+#define pte_write(pte)          ((pte).pte_low & _PAGE_RW)
 #endif
 
 #define PTE_BIT_FUNC(h,fn,op) \
@@ -429,17 +442,10 @@ PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED);
 /*
  * Macro and implementation to make a page protection as uncachable.
  */
-#define pgprot_noncached pgprot_noncached
+#define pgprot_writecombine(prot) \
+        __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
 
-static inline pgprot_t pgprot_noncached(pgprot_t _prot)
-{
-        unsigned long prot = pgprot_val(_prot);
-
-        prot &= ~_PAGE_CACHABLE;
-        return __pgprot(prot);
-}
-
-#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
+#define pgprot_noncached         pgprot_writecombine
 
 /*
  * Conversion functions: convert a page and protection to a page entry,
@@ -451,28 +457,33 @@ static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
-        set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) |
-                            pgprot_val(newprot)));
+        pte.pte_low &= _PAGE_CHG_MASK;
+        pte.pte_low |= pgprot_val(newprot);
+
+#ifdef CONFIG_X2TLB
+        pte.pte_high |= pgprot_val(newprot) >> 32;
+#endif
+
         return pte;
 }
 
-#define pmd_page_vaddr(pmd)     pmd_val(pmd)
+#define pmd_page_vaddr(pmd)     ((unsigned long)pmd_val(pmd))
 #define pmd_page(pmd)           (virt_to_page(pmd_val(pmd)))
 
 /* to find an entry in a page-table-directory. */
-#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
-#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
+#define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
 
 /* to find an entry in a kernel page-table-directory */
-#define pgd_offset_k(address) pgd_offset(&init_mm, address)
+#define pgd_offset_k(address)   pgd_offset(&init_mm, address)
 
 /* Find an entry in the third-level page table.. */
-#define pte_index(address) \
-                ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define pte_index(address)      ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 #define pte_offset_kernel(dir, address) \
         ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
-#define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
-#define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address)
+#define pte_offset_map(dir, address)            pte_offset_kernel(dir, address)
+#define pte_offset_map_nested(dir, address)     pte_offset_kernel(dir, address)
+
 #define pte_unmap(pte)          do { } while (0)
 #define pte_unmap_nested(pte)   do { } while (0)
 
@@ -480,13 +491,14 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 #define pte_ERROR(e) \
         printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \
                &(e), (e).pte_high, (e).pte_low)
+#define pgd_ERROR(e) \
+        printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e))
 #else
 #define pte_ERROR(e) \
         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
-#endif
-
 #define pgd_ERROR(e) \
         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
+#endif
 
 struct vm_area_struct;
 extern void update_mmu_cache(struct vm_area_struct * vma,