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riscv: Introduce huge page support for 32/64bit kernel

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This patch implements both 4MB huge page support for 32bit kernel
and 2MB/1GB huge pages support for 64bit kernel.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Alexandre Ghiti
2019-05-26 08:50:38 -04:00
committed by Paul Walmsley
parent 3876d4a38a
commit 9e953cda5c
6 changed files with 88 additions and 2 deletions
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8
arch/riscv/include/asm/pgtable.h
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@@ -113,7 +113,6 @@ static inline void pmd_clear(pmd_t *pmdp)
set_pmd(pmdp, __pmd(0));
}
static inline pgd_t pfn_pgd(unsigned long pfn, pgprot_t prot)
{
return __pgd((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
@@ -250,6 +249,11 @@ static inline pte_t pte_mkspecial(pte_t pte)
return __pte(pte_val(pte) | _PAGE_SPECIAL);
}
static inline pte_t pte_mkhuge(pte_t pte)
{
return pte;
}
/* Modify page protection bits */
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
@@ -409,7 +413,7 @@ static inline void pgtable_cache_init(void)
#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
/*
* Task size is 0x40000000000 for RV64 or 0xb800000 for RV32.
* Task size is 0x4000000000 for RV64 or 0xb800000 for RV32.
* Note that PGDIR_SIZE must evenly divide TASK_SIZE.
*/
#ifdef CONFIG_64BIT