diff options
| author | Steven J. Hill <Steven.Hill@imgtec.com> | 2015-02-26 18:16:38 -0600 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-03-19 17:39:49 +0100 |
| commit | c5b367835cfc7a8ef53b9670a409ffcc95194344 (patch) | |
| tree | 23a6be89021f93b09bb0f2340bc995c21bcab79b /arch/mips/mm/init.c | |
| parent | be0c37c985eddc46d0d67543898c086f60460e2e (diff) | |
MIPS: Add support for XPA.
Add support for extended physical addressing (XPA) so that
32-bit platforms can access equal to or greater than 40 bits
of physical addresses.
NOTE:
1) XPA and EVA are not the same and cannot be used
simultaneously.
2) If you configure your kernel for XPA, the PTEs
and all address sizes become 64-bit.
3) Your platform MUST have working HIGHMEM support.
Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9355/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mm/init.c')
| -rw-r--r-- | arch/mips/mm/init.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c index 448cde372af0..faa5c9822ecc 100644 --- a/arch/mips/mm/init.c +++ b/arch/mips/mm/init.c @@ -96,7 +96,7 @@ static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot) vaddr = __fix_to_virt(FIX_CMAP_END - idx); pte = mk_pte(page, prot); #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) - entrylo = pte.pte_high; + entrylo = pte_to_entrylo(pte.pte_high); #else entrylo = pte_to_entrylo(pte_val(pte)); #endif @@ -106,6 +106,11 @@ static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot) write_c0_entryhi(vaddr & (PAGE_MASK << 1)); write_c0_entrylo0(entrylo); write_c0_entrylo1(entrylo); +#ifdef CONFIG_XPA + entrylo = (pte.pte_low & _PFNX_MASK); + writex_c0_entrylo0(entrylo); + writex_c0_entrylo1(entrylo); +#endif tlbidx = read_c0_wired(); write_c0_wired(tlbidx + 1); write_c0_index(tlbidx); |