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[S390] System z large page support.

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This adds hugetlbfs support on System z, using both hardware large page
support if available and software large page emulation on older hardware.
Shared (large) page tables are implemented in software emulation mode,
by using page->index of the first tail page from a compound large page
to store page table information.

Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer
2008-04-30 13:38:46 +02:00
committed by Martin Schwidefsky
parent 2e5061e40a
commit 53492b1de4
14 changed files with 437 additions and 42 deletions
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23
arch/s390/mm/init.c
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@@ -77,28 +77,6 @@ void show_mem(void)
printk("%lu pages pagetables\n", global_page_state(NR_PAGETABLE));
}
static void __init setup_ro_region(void)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pte_t new_pte;
unsigned long address, end;
address = ((unsigned long)&_stext) & PAGE_MASK;
end = PFN_ALIGN((unsigned long)&_eshared);
for (; address < end; address += PAGE_SIZE) {
pgd = pgd_offset_k(address);
pud = pud_offset(pgd, address);
pmd = pmd_offset(pud, address);
pte = pte_offset_kernel(pmd, address);
new_pte = mk_pte_phys(address, __pgprot(_PAGE_RO));
*pte = new_pte;
}
}
/*
* paging_init() sets up the page tables
*/
@@ -121,7 +99,6 @@ void __init paging_init(void)
clear_table((unsigned long *) init_mm.pgd, pgd_type,
sizeof(unsigned long)*2048);
vmem_map_init();
setup_ro_region();
/* enable virtual mapping in kernel mode */
__ctl_load(S390_lowcore.kernel_asce, 1, 1);