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3f5ab76816
The previous expressions were wrong which made free_pmd_range() explode when using anything other than 4KB pages (which is why 8KB and 64KB pages were disabled with the 3-level page table layout). The problem was that pmd_offset() was returning an index of non-zero when it should have been returning 0. This non-zero offset was used to calculate the address of the pmd table to free in free_pmd_range(), which ended up trying to free an object that was not aligned on a page boundary. Now 3-level page tables should work with 4KB, 8KB and 64KB pages. Signed-off-by: Matt Fleming <matt@console-pimps.org>
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
#ifndef __ASM_SH_PGTABLE_PMD_H
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#define __ASM_SH_PGTABLE_PMD_H
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#include <asm-generic/pgtable-nopud.h>
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/*
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* Some cores need a 3-level page table layout, for example when using
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* 64-bit PTEs and 4K pages.
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*/
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#define PTE_MAGNITUDE 3 /* 64-bit PTEs on extended mode SH-X2 TLB */
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/* PGD bits */
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#define PGDIR_SHIFT 30
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#define PTRS_PER_PGD 4
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#define USER_PTRS_PER_PGD 2
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/* PMD bits */
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#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTE_MAGNITUDE))
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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#define PTRS_PER_PMD ((1 << PGDIR_SHIFT) / PMD_SIZE)
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#define pmd_ERROR(e) \
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printk("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e))
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typedef struct { unsigned long long pmd; } pmd_t;
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#define pmd_val(x) ((x).pmd)
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#define __pmd(x) ((pmd_t) { (x) } )
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static inline unsigned long pud_page_vaddr(pud_t pud)
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{
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return pud_val(pud);
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}
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#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
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static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
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{
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return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
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}
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#define pud_none(x) (!pud_val(x))
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#define pud_present(x) (pud_val(x))
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#define pud_clear(xp) do { set_pud(xp, __pud(0)); } while (0)
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#define pud_bad(x) (pud_val(x) & ~PAGE_MASK)
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/*
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* (puds are folded into pgds so this doesn't get actually called,
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* but the define is needed for a generic inline function.)
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*/
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#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
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#endif /* __ASM_SH_PGTABLE_PMD_H */
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