From 3c726f8dee6f55e96475574e9f645327e461884c Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Mon, 7 Nov 2005 11:06:55 +1100 Subject: [PATCH] ppc64: support 64k pages Adds a new CONFIG_PPC_64K_PAGES which, when enabled, changes the kernel base page size to 64K. The resulting kernel still boots on any hardware. On current machines with 4K pages support only, the kernel will maintain 16 "subpages" for each 64K page transparently. Note that while real 64K capable HW has been tested, the current patch will not enable it yet as such hardware is not released yet, and I'm still verifying with the firmware architects the proper to get the information from the newer hypervisors. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Linus Torvalds --- arch/powerpc/mm/ppc_mmu_32.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'arch/powerpc/mm/ppc_mmu_32.c') diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c index cef9e83cc7e9e9..d137abd241ff09 100644 --- a/arch/powerpc/mm/ppc_mmu_32.c +++ b/arch/powerpc/mm/ppc_mmu_32.c @@ -178,6 +178,21 @@ void __init setbat(int index, unsigned long virt, unsigned long phys, bat_addrs[index].phys = phys; } +/* + * Preload a translation in the hash table + */ +void hash_preload(struct mm_struct *mm, unsigned long ea, + unsigned long access, unsigned long trap) +{ + pmd_t *pmd; + + if (Hash == 0) + return; + pmd = pmd_offset(pgd_offset(vma->vm_mm, address), address); + if (!pmd_none(*pmd)) + add_hash_page(vma->vm_mm->context, address, pmd_val(*pmd)); +} + /* * Initialize the hash table and patch the instructions in hashtable.S. */ -- cgit 1.2.3-korg