Paul Mackerras <[email protected]> writes:
> From: Paul Mackerras <[email protected]>
>
> 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
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