[mirror_ubuntu-jammy-kernel.git] / arch / powerpc / include / asm / page.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ASM_POWERPC_PAGE_H
#define _ASM_POWERPC_PAGE_H

/*
 * Copyright (C) 2001,2005 IBM Corporation.
 */

#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <linux/kernel.h>
#else
#include <asm/types.h>
#endif
#include <asm/asm-const.h>

/*
 * On regular PPC32 page size is 4K (but we support 4K/16K/64K/256K pages
 * on PPC44x and 4K/16K on 8xx). For PPC64 we support either 4K or 64K software
 * page size. When using 64K pages however, whether we are really supporting
 * 64K pages in HW or not is irrelevant to those definitions.
 */
#define PAGE_SHIFT		CONFIG_PPC_PAGE_SHIFT
#define PAGE_SIZE		(ASM_CONST(1) << PAGE_SHIFT)

#ifndef __ASSEMBLY__
#ifndef CONFIG_HUGETLB_PAGE
#define HPAGE_SHIFT PAGE_SHIFT
#elif defined(CONFIG_PPC_BOOK3S_64)
extern unsigned int hpage_shift;
#define HPAGE_SHIFT hpage_shift
#elif defined(CONFIG_PPC_8xx)
#define HPAGE_SHIFT		19	/* 512k pages */
#elif defined(CONFIG_PPC_FSL_BOOK3E)
#define HPAGE_SHIFT		22	/* 4M pages */
#endif
#define HPAGE_SIZE		((1UL) << HPAGE_SHIFT)
#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
#define HUGE_MAX_HSTATE		(MMU_PAGE_COUNT-1)
#endif

/*
 * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
 * assign PAGE_MASK to a larger type it gets extended the way we want
 * (i.e. with 1s in the high bits)
 */
#define PAGE_MASK      (~((1 << PAGE_SHIFT) - 1))

/*
 * KERNELBASE is the virtual address of the start of the kernel, it's often
 * the same as PAGE_OFFSET, but _might not be_.
 *
 * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
 *
 * PAGE_OFFSET is the virtual address of the start of lowmem.
 *
 * PHYSICAL_START is the physical address of the start of the kernel.
 *
 * MEMORY_START is the physical address of the start of lowmem.
 *
 * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on
 * ppc32 and based on how they are set we determine MEMORY_START.
 *
 * For the linear mapping the following equation should be true:
 * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START
 *
 * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START
 *
 * There are two ways to determine a physical address from a virtual one:
 * va = pa + PAGE_OFFSET - MEMORY_START
 * va = pa + KERNELBASE - PHYSICAL_START
 *
 * If you want to know something's offset from the start of the kernel you
 * should subtract KERNELBASE.
 *
 * If you want to test if something's a kernel address, use is_kernel_addr().
 */

#define KERNELBASE      ASM_CONST(CONFIG_KERNEL_START)
#define PAGE_OFFSET	ASM_CONST(CONFIG_PAGE_OFFSET)
#define LOAD_OFFSET	ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))

#if defined(CONFIG_NONSTATIC_KERNEL)
#ifndef __ASSEMBLY__

extern phys_addr_t memstart_addr;
extern phys_addr_t kernstart_addr;

#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC32)
extern long long virt_phys_offset;
#endif

#endif /* __ASSEMBLY__ */
#define PHYSICAL_START	kernstart_addr

#else	/* !CONFIG_NONSTATIC_KERNEL */
#define PHYSICAL_START	ASM_CONST(CONFIG_PHYSICAL_START)
#endif

/* See Description below for VIRT_PHYS_OFFSET */
#if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
#ifdef CONFIG_RELOCATABLE
#define VIRT_PHYS_OFFSET virt_phys_offset
#else
#define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START)
#endif
#endif

#ifdef CONFIG_PPC64
#define MEMORY_START	0UL
#elif defined(CONFIG_NONSTATIC_KERNEL)
#define MEMORY_START	memstart_addr
#else
#define MEMORY_START	(PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
#endif

#ifdef CONFIG_FLATMEM
#define ARCH_PFN_OFFSET		((unsigned long)(MEMORY_START >> PAGE_SHIFT))
#ifndef __ASSEMBLY__
extern unsigned long max_mapnr;
static inline bool pfn_valid(unsigned long pfn)
{
	unsigned long min_pfn = ARCH_PFN_OFFSET;

	return pfn >= min_pfn && pfn < max_mapnr;
}
#endif
#endif

#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
#define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

#define virt_addr_valid(vaddr)	({					\
	unsigned long _addr = (unsigned long)vaddr;			\
	_addr >= PAGE_OFFSET && _addr < (unsigned long)high_memory &&	\
	pfn_valid(virt_to_pfn(_addr));					\
})

/*
 * On Book-E parts we need __va to parse the device tree and we can't
 * determine MEMORY_START until then.  However we can determine PHYSICAL_START
 * from information at hand (program counter, TLB lookup).
 *
 * On BookE with RELOCATABLE && PPC32
 *
 *   With RELOCATABLE && PPC32,  we support loading the kernel at any physical
 *   address without any restriction on the page alignment.
 *
 *   We find the runtime address of _stext and relocate ourselves based on 
 *   the following calculation:
 *
 *  	  virtual_base = ALIGN_DOWN(KERNELBASE,256M) +
 *  				MODULO(_stext.run,256M)
 *   and create the following mapping:
 *
 * 	  ALIGN_DOWN(_stext.run,256M) => ALIGN_DOWN(KERNELBASE,256M)
 *
 *   When we process relocations, we cannot depend on the
 *   existing equation for the __va()/__pa() translations:
 *
 * 	   __va(x) = (x)  - PHYSICAL_START + KERNELBASE
 *
 *   Where:
 *   	 PHYSICAL_START = kernstart_addr = Physical address of _stext
 *  	 KERNELBASE = Compiled virtual address of _stext.
 *
 *   This formula holds true iff, kernel load address is TLB page aligned.
 *
 *   In our case, we need to also account for the shift in the kernel Virtual 
 *   address.
 *
 *   E.g.,
 *
 *   Let the kernel be loaded at 64MB and KERNELBASE be 0xc0000000 (same as PAGE_OFFSET).
 *   In this case, we would be mapping 0 to 0xc0000000, and kernstart_addr = 64M
 *
 *   Now __va(1MB) = (0x100000) - (0x4000000) + 0xc0000000
 *                 = 0xbc100000 , which is wrong.
 *
 *   Rather, it should be : 0xc0000000 + 0x100000 = 0xc0100000
 *      	according to our mapping.
 *
 *   Hence we use the following formula to get the translations right:
 *
 * 	  __va(x) = (x) - [ PHYSICAL_START - Effective KERNELBASE ]
 *
 * 	  Where :
 * 		PHYSICAL_START = dynamic load address.(kernstart_addr variable)
 * 		Effective KERNELBASE = virtual_base =
 * 				     = ALIGN_DOWN(KERNELBASE,256M) +
 * 						MODULO(PHYSICAL_START,256M)
 *
 * 	To make the cost of __va() / __pa() more light weight, we introduce
 * 	a new variable virt_phys_offset, which will hold :
 *
 * 	virt_phys_offset = Effective KERNELBASE - PHYSICAL_START
 * 			 = ALIGN_DOWN(KERNELBASE,256M) - 
 * 			 	ALIGN_DOWN(PHYSICALSTART,256M)
 *
 * 	Hence :
 *
 * 	__va(x) = x - PHYSICAL_START + Effective KERNELBASE
 * 		= x + virt_phys_offset
 *
 * 		and
 * 	__pa(x) = x + PHYSICAL_START - Effective KERNELBASE
 * 		= x - virt_phys_offset
 * 		
 * On non-Book-E PPC64 PAGE_OFFSET and MEMORY_START are constants so use
 * the other definitions for __va & __pa.
 */
#if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET))
#define __pa(x) ((phys_addr_t)(unsigned long)(x) - VIRT_PHYS_OFFSET)
#else
#ifdef CONFIG_PPC64
/*
 * gcc miscompiles (unsigned long)(&static_var) - PAGE_OFFSET
 * with -mcmodel=medium, so we use & and | instead of - and + on 64-bit.
 * This also results in better code generation.
 */
#define __va(x)								\
({									\
	VIRTUAL_BUG_ON((unsigned long)(x) >= PAGE_OFFSET);		\
	(void *)(unsigned long)((phys_addr_t)(x) | PAGE_OFFSET);	\
})

#define __pa(x)								\
({									\
	VIRTUAL_BUG_ON((unsigned long)(x) < PAGE_OFFSET);		\
	(unsigned long)(x) & 0x0fffffffffffffffUL;			\
})

#else /* 32-bit, non book E */
#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START))
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)
#endif
#endif

/*
 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
 * and needs to be executable.  This means the whole heap ends
 * up being executable.
 */
#define VM_DATA_DEFAULT_FLAGS32	VM_DATA_FLAGS_TSK_EXEC
#define VM_DATA_DEFAULT_FLAGS64	VM_DATA_FLAGS_NON_EXEC

#ifdef __powerpc64__
#include <asm/page_64.h>
#else
#include <asm/page_32.h>
#endif

/*
 * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
 * "kernelness", use is_kernel_addr() - it should do what you want.
 */
#ifdef CONFIG_PPC_BOOK3E_64
#define is_kernel_addr(x)	((x) >= 0x8000000000000000ul)
#elif defined(CONFIG_PPC_BOOK3S_64)
#define is_kernel_addr(x)	((x) >= PAGE_OFFSET)
#else
#define is_kernel_addr(x)	((x) >= TASK_SIZE)
#endif

#ifndef CONFIG_PPC_BOOK3S_64
/*
 * Use the top bit of the higher-level page table entries to indicate whether
 * the entries we point to contain hugepages.  This works because we know that
 * the page tables live in kernel space.  If we ever decide to support having
 * page tables at arbitrary addresses, this breaks and will have to change.
 */
#ifdef CONFIG_PPC64
#define PD_HUGE 0x8000000000000000UL
#else
#define PD_HUGE 0x80000000
#endif

#else	/* CONFIG_PPC_BOOK3S_64 */
/*
 * Book3S 64 stores real addresses in the hugepd entries to
 * avoid overlaps with _PAGE_PRESENT and _PAGE_PTE.
 */
#define HUGEPD_ADDR_MASK	(0x0ffffffffffffffful & ~HUGEPD_SHIFT_MASK)
#endif /* CONFIG_PPC_BOOK3S_64 */

/*
 * Some number of bits at the level of the page table that points to
 * a hugepte are used to encode the size.  This masks those bits.
 * On 8xx, HW assistance requires 4k alignment for the hugepte.
 */
#ifdef CONFIG_PPC_8xx
#define HUGEPD_SHIFT_MASK     0xfff
#else
#define HUGEPD_SHIFT_MASK     0x3f
#endif

#ifndef __ASSEMBLY__

#ifdef CONFIG_PPC_BOOK3S_64
#include <asm/pgtable-be-types.h>
#else
#include <asm/pgtable-types.h>
#endif


#ifndef CONFIG_HUGETLB_PAGE
#define is_hugepd(pdep)		(0)
#define pgd_huge(pgd)		(0)
#endif /* CONFIG_HUGETLB_PAGE */

struct page;
extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
extern void copy_user_page(void *to, void *from, unsigned long vaddr,
		struct page *p);
extern int devmem_is_allowed(unsigned long pfn);

#ifdef CONFIG_PPC_SMLPAR
void arch_free_page(struct page *page, int order);
#define HAVE_ARCH_FREE_PAGE
#endif

struct vm_area_struct;

extern unsigned long kernstart_virt_addr;

static inline unsigned long kaslr_offset(void)
{
	return kernstart_virt_addr - KERNELBASE;
}

#include <asm-generic/memory_model.h>
#endif /* __ASSEMBLY__ */
#include <asm/slice.h>

#endif /* _ASM_POWERPC_PAGE_H */
Commit	Line	Data
2874c5fd	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
5cd16ee9 ME	2	#ifndef _ASM_POWERPC_PAGE_H
	3	#define _ASM_POWERPC_PAGE_H
	4
	5	/*
	6	* Copyright (C) 2001,2005 IBM Corporation.
5cd16ee9 ME	7	*/
5cd16ee9 ME	8
a3ba68f9 KG	9	#ifndef __ASSEMBLY__
a3ba68f9 KG	10	#include <linux/types.h>
f78f7ed7	11	#include <linux/kernel.h>
463baa8a SR	12	#else
463baa8a SR	13	#include <asm/types.h>
a3ba68f9	14	#endif
ec0c464c	15	#include <asm/asm-const.h>
5cd16ee9 ME	16
5cd16ee9 ME	17	/*
e1240122	18	* On regular PPC32 page size is 4K (but we support 4K/16K/64K/256K pages
555f4fdb	19	* on PPC44x and 4K/16K on 8xx). For PPC64 we support either 4K or 64K software
5cd16ee9 ME	20	* page size. When using 64K pages however, whether we are really supporting
	21	* 64K pages in HW or not is irrelevant to those definitions.
	22	*/
555f4fdb	23	#define PAGE_SHIFT CONFIG_PPC_PAGE_SHIFT
5cd16ee9 ME	24	#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
5cd16ee9 ME	25
41151e77	26	#ifndef __ASSEMBLY__
c5710cd2	27	#ifndef CONFIG_HUGETLB_PAGE
41151e77	28	#define HPAGE_SHIFT PAGE_SHIFT
c5710cd2 CL	29	#elif defined(CONFIG_PPC_BOOK3S_64)
	30	extern unsigned int hpage_shift;
	31	#define HPAGE_SHIFT hpage_shift
	32	#elif defined(CONFIG_PPC_8xx)
	33	#define HPAGE_SHIFT 19 /* 512k pages */
	34	#elif defined(CONFIG_PPC_FSL_BOOK3E)
	35	#define HPAGE_SHIFT 22 /* 4M pages */
41151e77 BB	36	#endif
	37	#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
	38	#define HPAGE_MASK (~(HPAGE_SIZE - 1))
	39	#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
	40	#define HUGE_MAX_HSTATE (MMU_PAGE_COUNT-1)
	41	#endif
	42
5cd16ee9 ME	43	/*
	44	* Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
	45	* assign PAGE_MASK to a larger type it gets extended the way we want
	46	* (i.e. with 1s in the high bits)
	47	*/
	48	#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
	49
b5666f70 ME	50	/*
	51	* KERNELBASE is the virtual address of the start of the kernel, it's often
	52	* the same as PAGE_OFFSET, but _might not be_.
	53	*
	54	* The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
	55	*
37dd2bad KG	56	* PAGE_OFFSET is the virtual address of the start of lowmem.
	57	*
	58	* PHYSICAL_START is the physical address of the start of the kernel.
	59	*
	60	* MEMORY_START is the physical address of the start of lowmem.
	61	*
	62	* KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on
	63	* ppc32 and based on how they are set we determine MEMORY_START.
	64	*
	65	* For the linear mapping the following equation should be true:
	66	* KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START
	67	*
	68	* Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START
	69	*
b8394179	70	* There are two ways to determine a physical address from a virtual one:
37dd2bad KG	71	* va = pa + PAGE_OFFSET - MEMORY_START
37dd2bad KG	72	* va = pa + KERNELBASE - PHYSICAL_START
b5666f70 ME	73	*
	74	* If you want to know something's offset from the start of the kernel you
	75	* should subtract KERNELBASE.
	76	*
	77	* If you want to test if something's a kernel address, use is_kernel_addr().
	78	*/
398ab1fc	79
37dd2bad KG	80	#define KERNELBASE ASM_CONST(CONFIG_KERNEL_START)
	81	#define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET)
	82	#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))
	83
0f890c8d	84	#if defined(CONFIG_NONSTATIC_KERNEL)
37dd2bad	85	#ifndef __ASSEMBLY__
a3ba68f9	86
37dd2bad KG	87	extern phys_addr_t memstart_addr;
37dd2bad KG	88	extern phys_addr_t kernstart_addr;
368ff8f1	89
27d11496	90	#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC32)
368ff8f1	91	extern long long virt_phys_offset;
37dd2bad	92	#endif
368ff8f1 SP	93
368ff8f1 SP	94	#endif /* __ASSEMBLY__ */
37dd2bad	95	#define PHYSICAL_START kernstart_addr
368ff8f1 SP	96
368ff8f1 SP	97	#else /* !CONFIG_NONSTATIC_KERNEL */
37dd2bad	98	#define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START)
549e8152 PM	99	#endif
549e8152 PM	100
368ff8f1	101	/* See Description below for VIRT_PHYS_OFFSET */
ffda09a9 SW	102	#if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
ffda09a9 SW	103	#ifdef CONFIG_RELOCATABLE
368ff8f1 SP	104	#define VIRT_PHYS_OFFSET virt_phys_offset
	105	#else
	106	#define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START)
	107	#endif
ffda09a9	108	#endif
368ff8f1	109
549e8152 PM	110	#ifdef CONFIG_PPC64
549e8152 PM	111	#define MEMORY_START 0UL
0f890c8d	112	#elif defined(CONFIG_NONSTATIC_KERNEL)
549e8152 PM	113	#define MEMORY_START memstart_addr
549e8152 PM	114	#else
37dd2bad KG	115	#define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
37dd2bad KG	116	#endif
5cd16ee9	117
5cd16ee9	118	#ifdef CONFIG_FLATMEM
67eb5494	119	#define ARCH_PFN_OFFSET ((unsigned long)(MEMORY_START >> PAGE_SHIFT))
603b8922 MM	120	#ifndef __ASSEMBLY__
	121	extern unsigned long max_mapnr;
	122	static inline bool pfn_valid(unsigned long pfn)
	123	{
	124	unsigned long min_pfn = ARCH_PFN_OFFSET;
	125
	126	return pfn >= min_pfn && pfn < max_mapnr;
	127	}
	128	#endif
5cd16ee9 ME	129	#endif
5cd16ee9 ME	130
65d3223a AK	131	#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
65d3223a AK	132	#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
5cd16ee9	133	#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
e41e53cd	134
dd947357 KW	135	#define virt_addr_valid(vaddr) ({ \
	136	unsigned long _addr = (unsigned long)vaddr; \
	137	_addr >= PAGE_OFFSET && _addr < (unsigned long)high_memory && \
	138	pfn_valid(virt_to_pfn(_addr)); \
	139	})
5cd16ee9	140
dbc9632a KG	141	/*
	142	* On Book-E parts we need __va to parse the device tree and we can't
	143	* determine MEMORY_START until then. However we can determine PHYSICAL_START
	144	* from information at hand (program counter, TLB lookup).
	145	*
27d11496	146	* On BookE with RELOCATABLE && PPC32
368ff8f1	147	*
27d11496	148	* With RELOCATABLE && PPC32, we support loading the kernel at any physical
368ff8f1 SP	149	* address without any restriction on the page alignment.
	150	*
	151	* We find the runtime address of _stext and relocate ourselves based on
	152	* the following calculation:
	153	*
	154	* virtual_base = ALIGN_DOWN(KERNELBASE,256M) +
	155	* MODULO(_stext.run,256M)
	156	* and create the following mapping:
	157	*
	158	* ALIGN_DOWN(_stext.run,256M) => ALIGN_DOWN(KERNELBASE,256M)
	159	*
	160	* When we process relocations, we cannot depend on the
	161	* existing equation for the __va()/__pa() translations:
	162	*
	163	* __va(x) = (x) - PHYSICAL_START + KERNELBASE
	164	*
	165	* Where:
	166	* PHYSICAL_START = kernstart_addr = Physical address of _stext
	167	* KERNELBASE = Compiled virtual address of _stext.
	168	*
	169	* This formula holds true iff, kernel load address is TLB page aligned.
	170	*
	171	* In our case, we need to also account for the shift in the kernel Virtual
	172	* address.
	173	*
	174	* E.g.,
	175	*
	176	* Let the kernel be loaded at 64MB and KERNELBASE be 0xc0000000 (same as PAGE_OFFSET).
	177	* In this case, we would be mapping 0 to 0xc0000000, and kernstart_addr = 64M
	178	*
	179	* Now __va(1MB) = (0x100000) - (0x4000000) + 0xc0000000
	180	* = 0xbc100000 , which is wrong.
	181	*
	182	* Rather, it should be : 0xc0000000 + 0x100000 = 0xc0100000
	183	* according to our mapping.
	184	*
	185	* Hence we use the following formula to get the translations right:
	186	*
	187	* __va(x) = (x) - [ PHYSICAL_START - Effective KERNELBASE ]
	188	*
	189	* Where :
	190	* PHYSICAL_START = dynamic load address.(kernstart_addr variable)
	191	* Effective KERNELBASE = virtual_base =
	192	* = ALIGN_DOWN(KERNELBASE,256M) +
	193	* MODULO(PHYSICAL_START,256M)
	194	*
	195	* To make the cost of __va() / __pa() more light weight, we introduce
	196	* a new variable virt_phys_offset, which will hold :
	197	*
	198	* virt_phys_offset = Effective KERNELBASE - PHYSICAL_START
	199	* = ALIGN_DOWN(KERNELBASE,256M) -
	200	* ALIGN_DOWN(PHYSICALSTART,256M)
	201	*
	202	* Hence :
	203	*
	204	* __va(x) = x - PHYSICAL_START + Effective KERNELBASE
	205	* = x + virt_phys_offset
	206	*
	207	* and
	208	* __pa(x) = x + PHYSICAL_START - Effective KERNELBASE
	209	* = x - virt_phys_offset
	210	*
dbc9632a KG	211	* On non-Book-E PPC64 PAGE_OFFSET and MEMORY_START are constants so use
	212	* the other definitions for __va & __pa.
	213	*/
ffda09a9	214	#if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
368ff8f1	215	#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET))
6ad4afc9	216	#define __pa(x) ((phys_addr_t)(unsigned long)(x) - VIRT_PHYS_OFFSET)
dbc9632a	217	#else
bdbc29c1 PM	218	#ifdef CONFIG_PPC64
	219	/*
	220	* gcc miscompiles (unsigned long)(&static_var) - PAGE_OFFSET
	221	* with -mcmodel=medium, so we use & and \| instead of - and + on 64-bit.
4dd7554a	222	* This also results in better code generation.
bdbc29c1	223	*/
4dd7554a NP	224	#define __va(x) \
	225	({ \
	226	VIRTUAL_BUG_ON((unsigned long)(x) >= PAGE_OFFSET); \
	227	(void *)(unsigned long)((phys_addr_t)(x) \| PAGE_OFFSET); \
	228	})
	229
	230	#define __pa(x) \
	231	({ \
	232	VIRTUAL_BUG_ON((unsigned long)(x) < PAGE_OFFSET); \
	233	(unsigned long)(x) & 0x0fffffffffffffffUL; \
	234	})
bdbc29c1 PM	235
bdbc29c1 PM	236	#else /* 32-bit, non book E */
dbc9632a	237	#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START))
549e8152	238	#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)
dbc9632a	239	#endif
bdbc29c1	240	#endif
5cd16ee9 ME	241
	242	/*
	243	* Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
	244	* and needs to be executable. This means the whole heap ends
	245	* up being executable.
	246	*/
c62da0c3 AK	247	#define VM_DATA_DEFAULT_FLAGS32 VM_DATA_FLAGS_TSK_EXEC
c62da0c3 AK	248	#define VM_DATA_DEFAULT_FLAGS64 VM_DATA_FLAGS_NON_EXEC
5cd16ee9 ME	249
	250	#ifdef __powerpc64__
	251	#include <asm/page_64.h>
	252	#else
	253	#include <asm/page_32.h>
	254	#endif
	255
51fae6de ME	256	/*
	257	* Don't compare things with KERNELBASE or PAGE_OFFSET to test for
	258	* "kernelness", use is_kernel_addr() - it should do what you want.
	259	*/
57e2a99f BH	260	#ifdef CONFIG_PPC_BOOK3E_64
57e2a99f BH	261	#define is_kernel_addr(x) ((x) >= 0x8000000000000000ul)
b6be1bb7	262	#elif defined(CONFIG_PPC_BOOK3S_64)
51fae6de	263	#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
b6be1bb7 CL	264	#else
b6be1bb7 CL	265	#define is_kernel_addr(x) ((x) >= TASK_SIZE)
57e2a99f	266	#endif
51fae6de	267
cf9427b8	268	#ifndef CONFIG_PPC_BOOK3S_64
41151e77 BB	269	/*
	270	* Use the top bit of the higher-level page table entries to indicate whether
	271	* the entries we point to contain hugepages. This works because we know that
	272	* the page tables live in kernel space. If we ever decide to support having
	273	* page tables at arbitrary addresses, this breaks and will have to change.
	274	*/
	275	#ifdef CONFIG_PPC64
d456f352	276	#define PD_HUGE 0x8000000000000000UL
41151e77 BB	277	#else
	278	#define PD_HUGE 0x80000000
	279	#endif
c61a8843 PM	280
	281	#else /* CONFIG_PPC_BOOK3S_64 */
	282	/*
	283	* Book3S 64 stores real addresses in the hugepd entries to
	284	* avoid overlaps with _PAGE_PRESENT and _PAGE_PTE.
	285	*/
	286	#define HUGEPD_ADDR_MASK (0x0ffffffffffffffful & ~HUGEPD_SHIFT_MASK)
cf9427b8	287	#endif /* CONFIG_PPC_BOOK3S_64 */
41151e77 BB	288
	289	/*
	290	* Some number of bits at the level of the page table that points to
	291	* a hugepte are used to encode the size. This masks those bits.
50a175dd	292	* On 8xx, HW assistance requires 4k alignment for the hugepte.
41151e77	293	*/
50a175dd CL	294	#ifdef CONFIG_PPC_8xx
	295	#define HUGEPD_SHIFT_MASK 0xfff
	296	#else
41151e77	297	#define HUGEPD_SHIFT_MASK 0x3f
50a175dd	298	#endif
41151e77	299
5cd16ee9 ME	300	#ifndef __ASSEMBLY__
5cd16ee9 ME	301
5dc1ef85 AK	302	#ifdef CONFIG_PPC_BOOK3S_64
	303	#include <asm/pgtable-be-types.h>
	304	#else
2bf59916	305	#include <asm/pgtable-types.h>
5dc1ef85	306	#endif
5cd16ee9	307
a4fe3ce7	308
26a344ae AK	309	#ifndef CONFIG_HUGETLB_PAGE
	310	#define is_hugepd(pdep) (0)
	311	#define pgd_huge(pgd) (0)
a4fe3ce7	312	#endif /* CONFIG_HUGETLB_PAGE */
26a344ae	313
5cd16ee9 ME	314	struct page;
	315	extern void clear_user_page(void page, unsigned long vaddr, struct page pg);
	316	extern void copy_user_page(void to, void from, unsigned long vaddr,
	317	struct page *p);
1d54cf2b	318	extern int devmem_is_allowed(unsigned long pfn);
5cd16ee9	319
14f966e7 RJ	320	#ifdef CONFIG_PPC_SMLPAR
	321	void arch_free_page(struct page *page, int order);
	322	#define HAVE_ARCH_FREE_PAGE
	323	#endif
	324
a5bba930	325	struct vm_area_struct;
2f569afd	326
39f4b7bf JY	327	extern unsigned long kernstart_virt_addr;
39f4b7bf JY	328
921a79b7 JY	329	static inline unsigned long kaslr_offset(void)
	330	{
	331	return kernstart_virt_addr - KERNELBASE;
	332	}
	333
659e3505	334	#include <asm-generic/memory_model.h>
5cd16ee9	335	#endif /* __ASSEMBLY__ */
a3286f05	336	#include <asm/slice.h>
5cd16ee9	337
5cd16ee9	338	#endif /* _ASM_POWERPC_PAGE_H */