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/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  S390 version
 *    Copyright IBM Corp. 1999, 2000
 *    Author(s): Hartmut Penner (hp@de.ibm.com)
 */

#ifndef _S390_PAGE_H
#define _S390_PAGE_H

#include <linux/const.h>
#include <asm/types.h>

#define _PAGE_SHIFT	12
#define _PAGE_SIZE	(_AC(1, UL) << _PAGE_SHIFT)
#define _PAGE_MASK	(~(_PAGE_SIZE - 1))

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT	_PAGE_SHIFT
#define PAGE_SIZE	_PAGE_SIZE
#define PAGE_MASK	_PAGE_MASK
#define PAGE_DEFAULT_ACC	0
#define PAGE_DEFAULT_KEY	(PAGE_DEFAULT_ACC << 4)

#define HPAGE_SHIFT	20
#define HPAGE_SIZE	(1UL << HPAGE_SHIFT)
#define HPAGE_MASK	(~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
#define HUGE_MAX_HSTATE		2

#define ARCH_HAS_SETCLEAR_HUGE_PTE
#define ARCH_HAS_HUGE_PTE_TYPE
#define ARCH_HAS_PREPARE_HUGEPAGE
#define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH

#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA

#include <asm/setup.h>
#ifndef __ASSEMBLY__

void __storage_key_init_range(unsigned long start, unsigned long end);

static inline void storage_key_init_range(unsigned long start, unsigned long end)
{
	if (PAGE_DEFAULT_KEY != 0)
		__storage_key_init_range(start, end);
}

#define clear_page(page)	memset((page), 0, PAGE_SIZE)

/*
 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to
 * bypass caches when copying a page. Especially when copying huge pages
 * this keeps L1 and L2 data caches alive.
 */
static inline void copy_page(void *to, void *from)
{
	register void *reg2 asm ("2") = to;
	register unsigned long reg3 asm ("3") = 0x1000;
	register void *reg4 asm ("4") = from;
	register unsigned long reg5 asm ("5") = 0xb0001000;
	asm volatile(
		"	mvcl	2,4"
		: "+d" (reg2), "+d" (reg3), "+d" (reg4), "+d" (reg5)
		: : "memory", "cc");
}

#define clear_user_page(page, vaddr, pg)	clear_page(page)
#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)

#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
	alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE

/*
 * These are used to make use of C type-checking..
 */

typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct { unsigned long pgste; } pgste_t;
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pud; } pud_t;
typedef struct { unsigned long p4d; } p4d_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef pte_t *pgtable_t;

#define pgprot_val(x)	((x).pgprot)
#define pgste_val(x)	((x).pgste)
#define pte_val(x)	((x).pte)
#define pmd_val(x)	((x).pmd)
#define pud_val(x)	((x).pud)
#define p4d_val(x)	((x).p4d)
#define pgd_val(x)      ((x).pgd)

#define __pgste(x)	((pgste_t) { (x) } )
#define __pte(x)        ((pte_t) { (x) } )
#define __pmd(x)        ((pmd_t) { (x) } )
#define __pud(x)	((pud_t) { (x) } )
#define __p4d(x)	((p4d_t) { (x) } )
#define __pgd(x)        ((pgd_t) { (x) } )
#define __pgprot(x)     ((pgprot_t) { (x) } )

static inline void page_set_storage_key(unsigned long addr,
					unsigned char skey, int mapped)
{
	if (!mapped)
		asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
			     : : "d" (skey), "a" (addr));
	else
		asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
}

static inline unsigned char page_get_storage_key(unsigned long addr)
{
	unsigned char skey;

	asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
	return skey;
}

static inline int page_reset_referenced(unsigned long addr)
{
	int cc;

	asm volatile(
		"	rrbe	0,%1\n"
		"	ipm	%0\n"
		"	srl	%0,28\n"
		: "=d" (cc) : "a" (addr) : "cc");
	return cc;
}

/* Bits int the storage key */
#define _PAGE_CHANGED		0x02	/* HW changed bit		*/
#define _PAGE_REFERENCED	0x04	/* HW referenced bit		*/
#define _PAGE_FP_BIT		0x08	/* HW fetch protection bit	*/
#define _PAGE_ACC_BITS		0xf0	/* HW access control bits	*/

struct page;
void arch_free_page(struct page *page, int order);
void arch_alloc_page(struct page *page, int order);
void arch_set_page_dat(struct page *page, int order);
void arch_set_page_nodat(struct page *page, int order);
int arch_test_page_nodat(struct page *page);
void arch_set_page_states(int make_stable);

static inline int devmem_is_allowed(unsigned long pfn)
{
	return 0;
}

#define HAVE_ARCH_FREE_PAGE
#define HAVE_ARCH_ALLOC_PAGE

#endif /* !__ASSEMBLY__ */

#define __PAGE_OFFSET		0x0UL
#define PAGE_OFFSET		0x0UL

#define __pa(x)			((unsigned long)(x))
#define __va(x)			((void *)(unsigned long)(x))

#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)

#define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
#define page_to_virt(page)	pfn_to_virt(page_to_pfn(page))

#define phys_to_pfn(kaddr)	((kaddr) >> PAGE_SHIFT)
#define pfn_to_phys(pfn)	((pfn) << PAGE_SHIFT)

#define phys_to_page(kaddr)	pfn_to_page(phys_to_pfn(kaddr))
#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)

#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#define ARCH_ZONE_DMA_BITS	31

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

#endif /* _S390_PAGE_H */

Filemanager

Name Type Size Permission Actions
fpu Folder 0755
trace Folder 0755
Kbuild File 557 B 0644
airq.h File 3.02 KB 0644
alternative-asm.h File 3.07 KB 0644
alternative.h File 4.99 KB 0644
ap.h File 9.9 KB 0644
appldata.h File 1.54 KB 0644
archrandom.h File 1.17 KB 0644
asm-prototypes.h File 227 B 0644
atomic.h File 5.1 KB 0644
atomic_ops.h File 4.02 KB 0644
barrier.h File 1.84 KB 0644
bitops.h File 10.13 KB 0644
bug.h File 1.49 KB 0644
bugs.h File 441 B 0644
cache.h File 387 B 0644
ccwdev.h File 7.99 KB 0644
ccwgroup.h File 2.53 KB 0644
checksum.h File 3.24 KB 0644
chpid.h File 974 B 0644
cio.h File 8.01 KB 0644
clp.h File 1.32 KB 0644
cmb.h File 425 B 0644
cmpxchg.h File 1.76 KB 0644
compat.h File 7.9 KB 0644
cpacf.h File 16.8 KB 0644
cpcmd.h File 1.11 KB 0644
cpu.h File 549 B 0644
cpu_mf.h File 8.99 KB 0644
cpufeature.h File 963 B 0644
cputime.h File 805 B 0644
crw.h File 1.86 KB 0644
css_chars.h File 769 B 0644
ctl_reg.h File 2.89 KB 0644
current.h File 405 B 0644
debug.h File 8.1 KB 0644
delay.h File 721 B 0644
diag.h File 5.94 KB 0644
dis.h File 637 B 0644
dma-mapping.h File 621 B 0644
dma.h File 456 B 0644
eadm.h File 2.03 KB 0644
ebcdic.h File 1.41 KB 0644
elf.h File 10.36 KB 0644
exec.h File 269 B 0644
extable.h File 875 B 0644
extmem.h File 804 B 0644
facility.h File 2.44 KB 0644
fcx.h File 7.91 KB 0644
ftrace.h File 1.66 KB 0644
futex.h File 2.09 KB 0644
gmap.h File 4.93 KB 0644
hardirq.h File 670 B 0644
hugetlb.h File 2.87 KB 0644
hw_irq.h File 249 B 0644
idals.h File 5.22 KB 0644
idle.h File 709 B 0644
io.h File 2.03 KB 0644
ipl.h File 3.6 KB 0644
irq.h File 2.55 KB 0644
irqflags.h File 1.76 KB 0644
isc.h File 1000 B 0644
itcw.h File 950 B 0644
jump_label.h File 1.36 KB 0644
kdebug.h File 386 B 0644
kexec.h File 1.32 KB 0644
kprobes.h File 2.24 KB 0644
kvm_host.h File 22.24 KB 0644
kvm_para.h File 5.78 KB 0644
linkage.h File 633 B 0644
livepatch.h File 461 B 0644
lowcore.h File 6.29 KB 0644
mmu.h File 1.19 KB 0644
mmu_context.h File 3.84 KB 0644
mmzone.h File 316 B 0644
module.h File 802 B 0644
nmi.h File 3.44 KB 0644
nospec-branch.h File 342 B 0644
nospec-insn.h File 3.81 KB 0644
numa.h File 730 B 0644
os_info.h File 1.1 KB 0644
page-states.h File 486 B 0644
page.h File 5.12 KB 0644
pci.h File 6.26 KB 0644
pci_clp.h File 4.25 KB 0644
pci_debug.h File 608 B 0644
pci_dma.h File 5.7 KB 0644
pci_insn.h File 2.59 KB 0644
pci_io.h File 4.58 KB 0644
percpu.h File 6.44 KB 0644
perf_event.h File 2.71 KB 0644
pgalloc.h File 4.32 KB 0644
pgtable.h File 47.7 KB 0644
pkey.h File 4.23 KB 0644
preempt.h File 3.25 KB 0644
processor.h File 10.42 KB 0644
ptrace.h File 5.27 KB 0644
qdio.h File 11.67 KB 0644
reset.h File 471 B 0644
runtime_instr.h File 1.76 KB 0644
schid.h File 525 B 0644
sclp.h File 3.38 KB 0644
scsw.h File 24.1 KB 0644
seccomp.h File 516 B 0644
sections.h File 155 B 0644
segment.h File 93 B 0644
serial.h File 147 B 0644
set_memory.h File 779 B 0644
setup.h File 4.44 KB 0644
shmparam.h File 285 B 0644
signal.h File 644 B 0644
sigp.h File 1.8 KB 0644
smp.h File 2.45 KB 0644
sparsemem.h File 214 B 0644
spinlock.h File 3.53 KB 0644
spinlock_types.h File 437 B 0644
stp.h File 1.26 KB 0644
string.h File 4.5 KB 0644
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syscall.h File 2.63 KB 0644
sysinfo.h File 4.22 KB 0644
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thread_info.h File 3.15 KB 0644
timex.h File 6.15 KB 0644
tlb.h File 5.71 KB 0644
tlbflush.h File 3.52 KB 0644
topology.h File 2.69 KB 0644
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unistd.h File 1.03 KB 0644
uprobes.h File 588 B 0644
user.h File 3.3 KB 0644
vdso.h File 1.8 KB 0644
vga.h File 170 B 0644
vtime.h File 182 B 0644
vtimer.h File 866 B 0644
vx-insn.h File 10.66 KB 0644
xor.h File 454 B 0644