From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Paul Mackerras <paulus@ozlabs.org>, linuxppc-dev@ozlabs.org
Subject: Re: [PATCH 3/9] powerpc/mm/book3s-64: Use physical addresses in upper page table tree levels
Date: Mon, 22 Feb 2016 12:36:03 +0530 [thread overview]
Message-ID: <871t85i5r8.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <1456108880-27464-4-git-send-email-paulus@ozlabs.org>
Paul Mackerras <paulus@ozlabs.org> writes:
> From: Paul Mackerras <paulus@samba.org>
>
> This changes the Linux page tables to store physical addresses
> rather than kernel virtual addresses in the upper levels of the
> tree (pgd, pud and pmd) for 64-bit Book 3S machines.
>
> This frees up some high order bits, and will be needed with
> PowerISA v3.0 machines which read the page table tree in hardware
> in radix mode.
>
Radix mark the top two bits at upper level page table tree.
ie,
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
pud_set(pud, __pgtable_ptr_val(pmd));
}
static inline void rpud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
*pud = __pud(__pa(pmd) | RPUD_VAL_BITS);
}
I guess we will do the same with hash to keep them same ?
-aneesh
next prev parent reply other threads:[~2016-02-22 7:06 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-22 2:41 [PATCH 0/9] powerpc/mm: Restructure Linux PTE on Book3S/64 to radix format Paul Mackerras
2016-02-22 2:41 ` [PATCH 1/9] powerpc/mm/book3s-64: Clean up some obsolete or misleading comments Paul Mackerras
2016-02-29 11:05 ` [1/9] " Michael Ellerman
2016-02-22 2:41 ` [PATCH 2/9] powerpc/mm/book3s-64: Free up 7 high-order bits in the Linux PTE Paul Mackerras
2016-02-22 2:41 ` [PATCH 3/9] powerpc/mm/book3s-64: Use physical addresses in upper page table tree levels Paul Mackerras
2016-02-22 4:55 ` Aneesh Kumar K.V
2016-02-23 1:16 ` Paul Mackerras
2016-02-22 7:06 ` Aneesh Kumar K.V [this message]
2016-02-23 1:19 ` Paul Mackerras
2016-02-23 2:36 ` [PATCH v2 " Paul Mackerras
2016-02-22 2:41 ` [PATCH 4/9] powerpc/mm/book3s-64: Move _PAGE_PRESENT to the most significant bit Paul Mackerras
2016-02-22 2:41 ` [PATCH 5/9] powerpc/mm/book3s-64: Move _PAGE_PTE to 2nd " Paul Mackerras
2016-02-22 2:41 ` [PATCH 6/9] powerpc/mm/book3s-64: Move HPTE-related bits in PTE to upper end Paul Mackerras
2016-02-22 2:41 ` [PATCH 7/9] powerpc/mm/book3s-64: Shuffle read, write, execute and user bits in PTE Paul Mackerras
2016-02-22 2:41 ` [PATCH 8/9] powerpc/mm/book3s-64: Move software-used " Paul Mackerras
2016-02-22 2:41 ` [PATCH 9/9] powerpc/mm/book3s-64: Expand the real page number field of the Linux PTE Paul Mackerras
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