arch/tile: finish enabling support for TILE-Gx 64-bit chip

This support was partially present in the existing code (look for
"__tilegx__" ifdefs) but with this change you can build a working
kernel using the TILE-Gx toolchain and ARCH=tilegx.

Most of these files are new, generally adding a foo_64.c file
where previously there was just a foo_32.c file.

The ARCH=tilegx directive redirects to arch/tile, not arch/tilegx,
using the existing SRCARCH mechanism in the top-level Makefile.

Changes to existing files:

- <asm/bitops.h> and <asm/bitops_32.h> changed to factor the
  include of <asm-generic/bitops/non-atomic.h> in the common header.

- <asm/compat.h> and arch/tile/kernel/compat.c changed to remove
  the "const" markers I had put on compat_sys_execve() when trying
  to match some recent similar changes to the non-compat execve.
  It turns out the compat version wasn't "upgraded" to use const.

- <asm/opcode-tile_64.h> and <asm/opcode_constants_64.h> were
  previously included accidentally, with the 32-bit contents.  Now
  they have the proper 64-bit contents.

Finally, I had to hack the existing hacky drivers/input/input-compat.h
to add yet another "#ifdef" for INPUT_COMPAT_TEST (same as x86_64).

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> [drivers/input]

1 files changed, 175 insertions, 0 deletions

diff --git a/arch/tile/include/asm/pgtable_64.h b/arch/tile/include/asm/pgtable_64.h
new file mode 100644
index 000000000000..fd80328523b4
--- /dev/null
+++ b/arch/tile/include/asm/pgtable_64.h
@@ -0,0 +1,175 @@
+/*
+ * Copyright 2011 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ *
+ */
+
+#ifndef _ASM_TILE_PGTABLE_64_H
+#define _ASM_TILE_PGTABLE_64_H
+
+/* The level-0 page table breaks the address space into 32-bit chunks. */
+#define PGDIR_SHIFT	HV_LOG2_L1_SPAN
+#define PGDIR_SIZE	HV_L1_SPAN
+#define PGDIR_MASK	(~(PGDIR_SIZE-1))
+#define PTRS_PER_PGD	HV_L0_ENTRIES
+#define SIZEOF_PGD	(PTRS_PER_PGD * sizeof(pgd_t))
+
+/*
+ * The level-1 index is defined by the huge page size.  A PMD is composed
+ * of PTRS_PER_PMD pgd_t's and is the middle level of the page table.
+ */
+#define PMD_SHIFT	HV_LOG2_PAGE_SIZE_LARGE
+#define PMD_SIZE	HV_PAGE_SIZE_LARGE
+#define PMD_MASK	(~(PMD_SIZE-1))
+#define PTRS_PER_PMD	(1 << (PGDIR_SHIFT - PMD_SHIFT))
+#define SIZEOF_PMD	(PTRS_PER_PMD * sizeof(pmd_t))
+
+/*
+ * The level-2 index is defined by the difference between the huge
+ * page size and the normal page size.  A PTE is composed of
+ * PTRS_PER_PTE pte_t's and is the bottom level of the page table.
+ * Note that the hypervisor docs use PTE for what we call pte_t, so
+ * this nomenclature is somewhat confusing.
+ */
+#define PTRS_PER_PTE (1 << (HV_LOG2_PAGE_SIZE_LARGE - HV_LOG2_PAGE_SIZE_SMALL))
+#define SIZEOF_PTE	(PTRS_PER_PTE * sizeof(pte_t))
+
+/*
+ * Align the vmalloc area to an L2 page table, and leave a guard page
+ * at the beginning and end.  The vmalloc code also puts in an internal
+ * guard page between each allocation.
+ */
+#define _VMALLOC_END	HUGE_VMAP_BASE
+#define VMALLOC_END	(_VMALLOC_END - PAGE_SIZE)
+#define VMALLOC_START	(_VMALLOC_START + PAGE_SIZE)
+
+#define HUGE_VMAP_END	(HUGE_VMAP_BASE + PGDIR_SIZE)
+
+#ifndef __ASSEMBLY__
+
+/* We have no pud since we are a three-level page table. */
+#include <asm-generic/pgtable-nopud.h>
+
+static inline int pud_none(pud_t pud)
+{
+	return pud_val(pud) == 0;
+}
+
+static inline int pud_present(pud_t pud)
+{
+	return pud_val(pud) & _PAGE_PRESENT;
+}
+
+#define pmd_ERROR(e) \
+	pr_err("%s:%d: bad pmd 0x%016llx.\n", __FILE__, __LINE__, pmd_val(e))
+
+static inline void pud_clear(pud_t *pudp)
+{
+	__pte_clear(&pudp->pgd);
+}
+
+static inline int pud_bad(pud_t pud)
+{
+	return ((pud_val(pud) & _PAGE_ALL) != _PAGE_TABLE);
+}
+
+/* Return the page-table frame number (ptfn) that a pud_t points at. */
+#define pud_ptfn(pud) hv_pte_get_ptfn((pud).pgd)
+
+/*
+ * A given kernel pud_t maps to a kernel pmd_t table at a specific
+ * virtual address.  Since kernel pmd_t tables can be aligned at
+ * sub-page granularity, this macro can return non-page-aligned
+ * pointers, despite its name.
+ */
+#define pud_page_vaddr(pud) \
+	(__va((phys_addr_t)pud_ptfn(pud) << HV_LOG2_PAGE_TABLE_ALIGN))
+
+/*
+ * A pud_t points to a pmd_t array.  Since we can have multiple per
+ * page, we don't have a one-to-one mapping of pud_t's to pages.
+ */
+#define pud_page(pud) pfn_to_page(HV_PTFN_TO_PFN(pud_ptfn(pud)))
+
+static inline unsigned long pud_index(unsigned long address)
+{
+	return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
+}
+
+#define pmd_offset(pud, address) \
+	((pmd_t *)pud_page_vaddr(*(pud)) + pmd_index(address))
+
+static inline void __set_pmd(pmd_t *pmdp, pmd_t pmdval)
+{
+	set_pte(pmdp, pmdval);
+}
+
+/* Create a pmd from a PTFN and pgprot. */
+static inline pmd_t ptfn_pmd(unsigned long ptfn, pgprot_t prot)
+{
+	return hv_pte_set_ptfn(prot, ptfn);
+}
+
+/* Return the page-table frame number (ptfn) that a pmd_t points at. */
+static inline unsigned long pmd_ptfn(pmd_t pmd)
+{
+	return hv_pte_get_ptfn(pmd);
+}
+
+static inline void pmd_clear(pmd_t *pmdp)
+{
+	__pte_clear(pmdp);
+}
+
+/* Normalize an address to having the correct high bits set. */
+#define pgd_addr_normalize pgd_addr_normalize
+static inline unsigned long pgd_addr_normalize(unsigned long addr)
+{
+	return ((long)addr << (CHIP_WORD_SIZE() - CHIP_VA_WIDTH())) >>
+		(CHIP_WORD_SIZE() - CHIP_VA_WIDTH());
+}
+
+/* We don't define any pgds for these addresses. */
+static inline int pgd_addr_invalid(unsigned long addr)
+{
+	return addr >= MEM_HV_START ||
+		(addr > MEM_LOW_END && addr < MEM_HIGH_START);
+}
+
+/*
+ * Use atomic instructions to provide atomicity against the hypervisor.
+ */
+#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
+static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
+					    unsigned long addr, pte_t *ptep)
+{
+	return (__insn_fetchand(&ptep->val, ~HV_PTE_ACCESSED) >>
+		HV_PTE_INDEX_ACCESSED) & 0x1;
+}
+
+#define __HAVE_ARCH_PTEP_SET_WRPROTECT
+static inline void ptep_set_wrprotect(struct mm_struct *mm,
+				      unsigned long addr, pte_t *ptep)
+{
+	__insn_fetchand(&ptep->val, ~HV_PTE_WRITABLE);
+}
+
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
+static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
+				       unsigned long addr, pte_t *ptep)
+{
+	return hv_pte(__insn_exch(&ptep->val, 0UL));
+}
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_TILE_PGTABLE_64_H */