HardenedBSD/sys/powerpc/include/pmap.h

/*-
 * SPDX-License-Identifier: BSD-3-Clause AND BSD-4-Clause
 *
 * Copyright (C) 2006 Semihalf, Marian Balakowicz <m8@semihalf.com>
 * All rights reserved.
 *
 * Adapted for Freescale's e500 core CPUs.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*-
 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
 * Copyright (C) 1995, 1996 TooLs GmbH.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *	from: $NetBSD: pmap.h,v 1.17 2000/03/30 16:18:24 jdolecek Exp $
 */

#ifndef	_MACHINE_PMAP_H_
#define	_MACHINE_PMAP_H_

#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/_cpuset.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>
#include <machine/sr.h>
#include <machine/pte.h>
#include <machine/slb.h>
#include <machine/tlb.h>
#include <machine/vmparam.h>
#ifdef __powerpc64__
#include <vm/_vm_radix.h>
#endif

/*
 * The radix page table structure is described by levels 1-4.
 * See Fig 33. on p. 1002 of Power ISA v3.0B
 *
 * Page directories and tables must be size aligned.
 */

/* Root page directory - 64k   -- each entry covers 512GB */
typedef uint64_t pml1_entry_t;
/* l2 page directory - 4k      -- each entry covers 1GB */
typedef uint64_t pml2_entry_t;
/* l3 page directory - 4k      -- each entry covers 2MB */
typedef uint64_t pml3_entry_t;
/* l4 page directory - 256B/4k -- each entry covers 64k/4k */
typedef uint64_t pml4_entry_t;

typedef uint64_t pt_entry_t;

struct pmap;
typedef struct pmap *pmap_t;

#define	PMAP_ENTER_QUICK_LOCKED	0x10000000

#if !defined(NPMAPS)
#define	NPMAPS		32768
#endif /* !defined(NPMAPS) */

struct	slbtnode;

struct pvo_entry {
	LIST_ENTRY(pvo_entry) pvo_vlink;	/* Link to common virt page */
#ifndef __powerpc64__
	LIST_ENTRY(pvo_entry) pvo_olink;	/* Link to overflow entry */
#endif
	union {
		RB_ENTRY(pvo_entry) pvo_plink;	/* Link to pmap entries */
		SLIST_ENTRY(pvo_entry) pvo_dlink; /* Link to delete enty */
	};
	struct {
#ifndef __powerpc64__
		/* 32-bit fields */
		pte_t	    pte;
#endif
		/* 64-bit fields */
		uintptr_t   slot;
		vm_paddr_t  pa;
		vm_prot_t   prot;
	} pvo_pte;
	pmap_t		pvo_pmap;		/* Owning pmap */
	vm_offset_t	pvo_vaddr;		/* VA of entry */
	uint64_t	pvo_vpn;		/* Virtual page number */
};
LIST_HEAD(pvo_head, pvo_entry);
SLIST_HEAD(pvo_dlist, pvo_entry);
RB_HEAD(pvo_tree, pvo_entry);
int pvo_vaddr_compare(struct pvo_entry *, struct pvo_entry *);
RB_PROTOTYPE(pvo_tree, pvo_entry, pvo_plink, pvo_vaddr_compare);

/* Used by 32-bit PMAP */
#define	PVO_PTEGIDX_MASK	0x007UL		/* which PTEG slot */
#define	PVO_PTEGIDX_VALID	0x008UL		/* slot is valid */
/* Used by 64-bit PMAP */
#define	PVO_HID			0x008UL		/* PVO entry in alternate hash*/
/* Used by both */
#define	PVO_WIRED		0x010UL		/* PVO entry is wired */
#define	PVO_MANAGED		0x020UL		/* PVO entry is managed */
#define	PVO_BOOTSTRAP		0x080UL		/* PVO entry allocated during
						   bootstrap */
#define	PVO_DEAD		0x100UL		/* waiting to be deleted */
#define	PVO_LARGE		0x200UL		/* large page */
#define	PVO_VADDR(pvo)		((pvo)->pvo_vaddr & ~ADDR_POFF)
#define	PVO_PTEGIDX_GET(pvo)	((pvo)->pvo_vaddr & PVO_PTEGIDX_MASK)
#define	PVO_PTEGIDX_ISSET(pvo)	((pvo)->pvo_vaddr & PVO_PTEGIDX_VALID)
#define	PVO_PTEGIDX_CLR(pvo)	\
	((void)((pvo)->pvo_vaddr &= ~(PVO_PTEGIDX_VALID|PVO_PTEGIDX_MASK)))
#define	PVO_PTEGIDX_SET(pvo, i)	\
	((void)((pvo)->pvo_vaddr |= (i)|PVO_PTEGIDX_VALID))
#define	PVO_VSID(pvo)		((pvo)->pvo_vpn >> 16)

struct	pmap {
	struct		pmap_statistics	pm_stats;
	struct	mtx	pm_mtx;
	cpuset_t	pm_active;
	union {
		struct {
		    #ifdef __powerpc64__
			struct slbtnode	*pm_slb_tree_root;
			struct slb	**pm_slb;
			int		pm_slb_len;
		    #else
			register_t	pm_sr[16];
		    #endif

			struct pmap	*pmap_phys;
			struct pvo_tree pmap_pvo;
		};
#ifdef __powerpc64__
		/* Radix support */
		struct {
			pml1_entry_t	*pm_pml1;	/* KVA of root page directory */
			struct vm_radix	 pm_radix;	/* spare page table pages */
			TAILQ_HEAD(,pv_chunk)	pm_pvchunk;	/* list of mappings in pmap */
			uint64_t	pm_pid; /* PIDR value */
			int pm_flags;
		};
#endif
		struct {
			/* TID to identify this pmap entries in TLB */
			tlbtid_t	pm_tid[MAXCPU];

#ifdef __powerpc64__
			/*
			 * Page table directory,
			 * array of pointers to page directories.
			 */
			pte_t ****pm_root;
#else
			/*
			 * Page table directory,
			 * array of pointers to page tables.
			 */
			pte_t		**pm_pdir;

			/* List of allocated ptbl bufs (ptbl kva regions). */
			TAILQ_HEAD(, ptbl_buf)	pm_ptbl_list;
#endif
		};
	} __aligned(CACHE_LINE_SIZE);
};

/*
 * pv_entries are allocated in chunks per-process.  This avoids the
 * need to track per-pmap assignments.
 */
#define	_NPCPV	126
#define	_NPCM	howmany(_NPCPV, 64)

#define	PV_CHUNK_HEADER							\
	pmap_t			pc_pmap;				\
	TAILQ_ENTRY(pv_chunk)	pc_list;				\
	uint64_t		pc_map[_NPCM];	/* bitmap; 1 = free */	\
	TAILQ_ENTRY(pv_chunk)	pc_lru;

struct pv_entry {
	pmap_t pv_pmap;
	vm_offset_t pv_va;
	TAILQ_ENTRY(pv_entry) pv_link;
};
typedef struct pv_entry *pv_entry_t;

struct pv_chunk_header {
	PV_CHUNK_HEADER
};
struct pv_chunk {
	PV_CHUNK_HEADER
	uint64_t	reserved;
	struct pv_entry		pc_pventry[_NPCPV];
};

struct	md_page {
	union {
		struct {
			volatile int32_t mdpg_attrs;
			vm_memattr_t	 mdpg_cache_attrs;
			struct	pvo_head mdpg_pvoh;
			int		pv_gen;   /* (p) */
		};
		struct {
			int			pv_tracked;
		};
	};
	TAILQ_HEAD(, pv_entry)	pv_list;  /* (p) */
};

#ifdef AIM
#define	pmap_page_get_memattr(m)	((m)->md.mdpg_cache_attrs)
#else
#define	pmap_page_get_memattr(m)	VM_MEMATTR_DEFAULT
#endif /* AIM */

/*
 * Return the VSID corresponding to a given virtual address.
 * If no VSID is currently defined, it will allocate one, and add
 * it to a free slot if available.
 *
 * NB: The PMAP MUST be locked already.
 */
uint64_t va_to_vsid(pmap_t pm, vm_offset_t va);

/* Lock-free, non-allocating lookup routines */
uint64_t kernel_va_to_slbv(vm_offset_t va);
struct slb *user_va_to_slb_entry(pmap_t pm, vm_offset_t va);

uint64_t allocate_user_vsid(pmap_t pm, uint64_t esid, int large);
void	free_vsid(pmap_t pm, uint64_t esid, int large);
void	slb_insert_user(pmap_t pm, struct slb *slb);
void	slb_insert_kernel(uint64_t slbe, uint64_t slbv);

struct slbtnode *slb_alloc_tree(void);
void     slb_free_tree(pmap_t pm);
struct slb **slb_alloc_user_cache(void);
void	slb_free_user_cache(struct slb **);

extern	struct pmap kernel_pmap_store;
#define	kernel_pmap	(&kernel_pmap_store)

#ifdef _KERNEL

#define	PMAP_LOCK(pmap)		mtx_lock(&(pmap)->pm_mtx)
#define	PMAP_LOCK_ASSERT(pmap, type) \
				mtx_assert(&(pmap)->pm_mtx, (type))
#define	PMAP_LOCK_DESTROY(pmap)	mtx_destroy(&(pmap)->pm_mtx)
#define	PMAP_LOCK_INIT(pmap)	mtx_init(&(pmap)->pm_mtx, \
				    (pmap == kernel_pmap) ? "kernelpmap" : \
				    "pmap", NULL, MTX_DEF | MTX_DUPOK)
#define	PMAP_LOCKED(pmap)	mtx_owned(&(pmap)->pm_mtx)
#define	PMAP_MTX(pmap)		(&(pmap)->pm_mtx)
#define	PMAP_TRYLOCK(pmap)	mtx_trylock(&(pmap)->pm_mtx)
#define	PMAP_UNLOCK(pmap)	mtx_unlock(&(pmap)->pm_mtx)

#define	pmap_page_is_write_mapped(m)	(((m)->a.flags & PGA_WRITEABLE) != 0)

#define	pmap_vm_page_alloc_check(m)

void		pmap_bootstrap(vm_offset_t, vm_offset_t);
void		pmap_kenter(vm_offset_t va, vm_paddr_t pa);
void		pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, vm_memattr_t);
void		pmap_kremove(vm_offset_t);
void		*pmap_mapdev(vm_paddr_t, vm_size_t);
void		*pmap_mapdev_attr(vm_paddr_t, vm_size_t, vm_memattr_t);
void		pmap_unmapdev(void *, vm_size_t);
void		pmap_page_set_memattr(vm_page_t, vm_memattr_t);
int		pmap_change_attr(vm_offset_t, vm_size_t, vm_memattr_t);
int		pmap_map_user_ptr(pmap_t pm, volatile const void *uaddr,
		    void **kaddr, size_t ulen, size_t *klen);
int		pmap_decode_kernel_ptr(vm_offset_t addr, int *is_user,
		    vm_offset_t *decoded_addr);
void		pmap_deactivate(struct thread *);
vm_paddr_t	pmap_kextract(vm_offset_t);
int		pmap_dev_direct_mapped(vm_paddr_t, vm_size_t);
bool		pmap_mmu_install(char *name, int prio);
void		pmap_mmu_init(void);
const char	*pmap_mmu_name(void);
bool		pmap_ps_enabled(pmap_t pmap);
int		pmap_nofault(pmap_t pmap, vm_offset_t va, vm_prot_t flags);
bool		pmap_page_is_mapped(vm_page_t m);
#define	pmap_map_delete(pmap, sva, eva)	pmap_remove(pmap, sva, eva)

void		pmap_page_array_startup(long count);

#define	vtophys(va)	pmap_kextract((vm_offset_t)(va))

extern	vm_offset_t virtual_avail;
extern	vm_offset_t virtual_end;
extern	caddr_t crashdumpmap;

extern	vm_offset_t msgbuf_phys;

extern	int pmap_bootstrapped;
extern	int radix_mmu;
extern	int superpages_enabled;

#ifdef AIM
void pmap_early_io_map_init(void);
#endif
vm_offset_t pmap_early_io_map(vm_paddr_t pa, vm_size_t size);
void pmap_early_io_unmap(vm_offset_t va, vm_size_t size);
void pmap_track_page(pmap_t pmap, vm_offset_t va);
void pmap_page_print_mappings(vm_page_t m);
void pmap_tlbie_all(void);

static inline int
pmap_vmspace_copy(pmap_t dst_pmap __unused, pmap_t src_pmap __unused)
{

	return (0);
}

#endif

#endif /* !_MACHINE_PMAP_H_ */