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MIPS: Add support for XPA.

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Add support for extended physical addressing (XPA) so that
32-bit platforms can access equal to or greater than 40 bits
of physical addresses.

NOTE:
      1) XPA and EVA are not the same and cannot be used
         simultaneously.
      2) If you configure your kernel for XPA, the PTEs
         and all address sizes become 64-bit.
      3) Your platform MUST have working HIGHMEM support.

Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9355/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Steven J. Hill
2015-02-26 18:16:38 -06:00
committed by Ralf Baechle
parent be0c37c985
commit c5b367835c
11 changed files with 173 additions and 44 deletions
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13
arch/mips/include/asm/pgtable-bits.h
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@@ -37,7 +37,11 @@
/*
* The following bits are implemented by the TLB hardware
*/
#define _PAGE_GLOBAL_SHIFT 0
#define _PAGE_NO_EXEC_SHIFT 0
#define _PAGE_NO_EXEC (1 << _PAGE_NO_EXEC_SHIFT)
#define _PAGE_NO_READ_SHIFT (_PAGE_NO_EXEC_SHIFT + 1)
#define _PAGE_NO_READ (1 << _PAGE_NO_READ_SHIFT)
#define _PAGE_GLOBAL_SHIFT (_PAGE_NO_READ_SHIFT + 1)
#define _PAGE_GLOBAL (1 << _PAGE_GLOBAL_SHIFT)
#define _PAGE_VALID_SHIFT (_PAGE_GLOBAL_SHIFT + 1)
#define _PAGE_VALID (1 << _PAGE_VALID_SHIFT)
@@ -49,7 +53,7 @@
/*
* The following bits are implemented in software
*/
#define _PAGE_PRESENT_SHIFT (_CACHE_SHIFT + 3)
#define _PAGE_PRESENT_SHIFT (24)
#define _PAGE_PRESENT (1 << _PAGE_PRESENT_SHIFT)
#define _PAGE_READ_SHIFT (_PAGE_PRESENT_SHIFT + 1)
#define _PAGE_READ (1 << _PAGE_READ_SHIFT)
@@ -62,6 +66,11 @@
#define _PFN_SHIFT (PAGE_SHIFT - 12 + _CACHE_SHIFT + 3)
/*
* Bits for extended EntryLo0/EntryLo1 registers
*/
#define _PFNX_MASK 0xffffff
#elif defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
/*