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authorGerald Schaefer <geraldsc@de.ibm.com>2008-04-30 07:38:46 -0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-04-30 07:38:47 -0400
commit53492b1de46a7576170e865062ffcfc93bb5650b (patch)
treebee94e5b2e8c19c1a094a25023cb82572707feb4 /include/asm-s390/page.h
parent2e5061e40af88070984e3769eafb5a06022375fd (diff)
[S390] System z large page support.
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>
Diffstat (limited to 'include/asm-s390/page.h')
-rw-r--r--include/asm-s390/page.h29
1 files changed, 23 insertions, 6 deletions
diff --git a/include/asm-s390/page.h b/include/asm-s390/page.h
index fe7f92b6ae6..b01e6fc9a29 100644
--- a/include/asm-s390/page.h
+++ b/include/asm-s390/page.h
@@ -19,17 +19,34 @@
19#define PAGE_DEFAULT_ACC 0 19#define PAGE_DEFAULT_ACC 0
20#define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) 20#define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
21 21
22#define HPAGE_SHIFT 20
23#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
24#define HPAGE_MASK (~(HPAGE_SIZE - 1))
25#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
26
27#define ARCH_HAS_SETCLEAR_HUGE_PTE
28#define ARCH_HAS_HUGE_PTE_TYPE
29#define ARCH_HAS_PREPARE_HUGEPAGE
30#define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
31
22#include <asm/setup.h> 32#include <asm/setup.h>
23#ifndef __ASSEMBLY__ 33#ifndef __ASSEMBLY__
24 34
25static inline void clear_page(void *page) 35static inline void clear_page(void *page)
26{ 36{
27 register unsigned long reg1 asm ("1") = 0; 37 if (MACHINE_HAS_PFMF) {
28 register void *reg2 asm ("2") = page; 38 asm volatile(
29 register unsigned long reg3 asm ("3") = 4096; 39 " .insn rre,0xb9af0000,%0,%1"
30 asm volatile( 40 : : "d" (0x10000), "a" (page) : "memory", "cc");
31 " mvcl 2,0" 41 } else {
32 : "+d" (reg2), "+d" (reg3) : "d" (reg1) : "memory", "cc"); 42 register unsigned long reg1 asm ("1") = 0;
43 register void *reg2 asm ("2") = page;
44 register unsigned long reg3 asm ("3") = 4096;
45 asm volatile(
46 " mvcl 2,0"
47 : "+d" (reg2), "+d" (reg3) : "d" (reg1)
48 : "memory", "cc");
49 }
33} 50}
34 51
35static inline void copy_page(void *to, void *from) 52static inline void copy_page(void *to, void *from)