/* $NetBSD: pmap.h,v 1.24 2024/08/04 08:16:25 skrll Exp $ */

/*
* Copyright (c) 2014, 2019, 2021 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas (of 3am Software Foundry), Maxime Villard, and
* Nick Hudson.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/

#ifndef _RISCV_PMAP_H_
#define _RISCV_PMAP_H_

#ifdef _KERNEL_OPT
#include "opt_modular.h"
#endif

#if !defined(_MODULE)

#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/pool.h>
#include <sys/evcnt.h>

#include <uvm/uvm_physseg.h>
#include <uvm/pmap/vmpagemd.h>

#include <riscv/pte.h>
#include <riscv/sysreg.h>

#define PMAP_SEGTABSIZE NPTEPG
#define PMAP_PDETABSIZE NPTEPG

#ifdef _LP64
#define PTPSHIFT        3
/* This is SV57. */
//#define       XSEGSHIFT       (SEGSHIFT + SEGLENGTH + SEGLENGTH + SEGLENGTH)

/* This is SV48. */
//#define       XSEGSHIFT       (SEGSHIFT + SEGLENGTH + SEGLENGTH)

/* This is SV39. */
#define XSEGSHIFT       (SEGSHIFT + SEGLENGTH)
#define NBXSEG          (1ULL << XSEGSHIFT)
#define XSEGOFSET       (NBXSEG - 1)            /* byte offset into xsegment */
#define XSEGLENGTH      (PGSHIFT - 3)
#define NXSEGPG         (1 << XSEGLENGTH)
#else
#define PTPSHIFT        2
#define XSEGSHIFT       SEGSHIFT
#endif

#define SEGLENGTH       (PGSHIFT - PTPSHIFT)
#define SEGSHIFT        (SEGLENGTH + PGSHIFT)
#define NBSEG           (1 << SEGSHIFT)         /* bytes/segment */
#define SEGOFSET        (NBSEG - 1)             /* byte offset into segment */

#define KERNEL_PID      0

#define PMAP_HWPAGEWALKER               1
#define PMAP_TLB_MAX                    1
#define PMAP_TLB_ALWAYS_ASIDS           false
#ifdef _LP64
#define PMAP_INVALID_PDETAB_ADDRESS     ((pmap_pdetab_t *)(VM_MIN_KERNEL_ADDRESS - PAGE_SIZE))
#define PMAP_INVALID_SEGTAB_ADDRESS     ((pmap_segtab_t *)(VM_MIN_KERNEL_ADDRESS - PAGE_SIZE))
#else
#define PMAP_INVALID_PDETAB_ADDRESS     ((pmap_pdetab_t *)0xdeadbeef)
#define PMAP_INVALID_SEGTAB_ADDRESS     ((pmap_segtab_t *)0xdeadbeef)
#endif
#define PMAP_TLB_NUM_PIDS               (__SHIFTOUT_MASK(SATP_ASID) + 1)
#define PMAP_TLB_BITMAP_LENGTH          PMAP_TLB_NUM_PIDS
#define PMAP_TLB_FLUSH_ASID_ON_RESET    true

#define pmap_phys_address(x)            (x)

#ifndef __BSD_PTENTRY_T__
#define __BSD_PTENTRY_T__
#ifdef _LP64
#define PRIxPTE         PRIx64
#else
#define PRIxPTE         PRIx32
#endif
#endif /* __BSD_PTENTRY_T__ */

#define PMAP_NEED_PROCWR
static inline void
pmap_procwr(struct proc *p, vaddr_t va, vsize_t len)
{
       __asm __volatile("fence\trw,rw; fence.i" ::: "memory");
}

#include <uvm/pmap/tlb.h>
#include <uvm/pmap/pmap_devmap.h>
#include <uvm/pmap/pmap_tlb.h>
#include <uvm/pmap/pmap_synci.h>

#define PMAP_GROWKERNEL
#define PMAP_STEAL_MEMORY

#ifdef _KERNEL

#define __HAVE_PMAP_MD
struct pmap_md {
       paddr_t md_ppn;
};

static inline void
pmap_md_icache_sync_all(void)
{
}

static inline void
pmap_md_icache_sync_range_index(vaddr_t va, vsize_t size)
{
}

struct vm_page *
       pmap_md_alloc_poolpage(int);
vaddr_t pmap_md_map_poolpage(paddr_t, vsize_t);
void    pmap_md_unmap_poolpage(vaddr_t, vsize_t);

bool    pmap_md_direct_mapped_vaddr_p(vaddr_t);
paddr_t pmap_md_direct_mapped_vaddr_to_paddr(vaddr_t);
vaddr_t pmap_md_direct_map_paddr(paddr_t);
void    pmap_md_init(void);
bool    pmap_md_io_vaddr_p(vaddr_t);
bool    pmap_md_ok_to_steal_p(const uvm_physseg_t, size_t);
void    pmap_md_pdetab_init(struct pmap *);
void    pmap_md_pdetab_fini(struct pmap *);
void    pmap_md_tlb_info_attach(struct pmap_tlb_info *, struct cpu_info *);
void    pmap_md_xtab_activate(struct pmap *, struct lwp *);
void    pmap_md_xtab_deactivate(struct pmap *);

void    pmap_bootstrap(vaddr_t, vaddr_t);

vsize_t pmap_kenter_range(vaddr_t, paddr_t, vsize_t, vm_prot_t, u_int);

#ifdef _LP64
extern vaddr_t pmap_direct_base;
extern vaddr_t pmap_direct_end;
#define PMAP_DIRECT_MAP(pa)     RISCV_PA_TO_KVA(pa)
#define PMAP_DIRECT_UNMAP(va)   RISCV_KVA_TO_PA(va)

/*
* Other hooks for the pool allocator.
*/
#define POOL_PHYSTOV(pa)        RISCV_PA_TO_KVA((paddr_t)(pa))
#define POOL_VTOPHYS(va)        RISCV_KVA_TO_PA((vaddr_t)(va))

#endif  /* _LP64 */

#define MEGAPAGE_TRUNC(x)       ((x) & ~SEGOFSET)
#define MEGAPAGE_ROUND(x)       MEGAPAGE_TRUNC((x) + SEGOFSET)

#define PMAP_DEV                __BIT(29)       /* 0x2000_0000 */

#define DEVMAP_ALIGN(x)         MEGAPAGE_TRUNC((x))
#define DEVMAP_SIZE(x)          MEGAPAGE_ROUND((x))
#define DEVMAP_FLAGS            PMAP_DEV

#ifdef __PMAP_PRIVATE

static inline bool
pmap_md_tlb_check_entry(void *ctx, vaddr_t va, tlb_asid_t asid, pt_entry_t pte)
{
       // TLB not walked and so not called.
       return false;
}

static inline void
pmap_md_page_syncicache(struct vm_page_md *mdpg, const kcpuset_t *onproc)
{
       __asm __volatile("fence\trw,rw; fence.i" ::: "memory");
}

/*
* Virtual Cache Alias helper routines.  Not a problem for RISCV CPUs.
*/
static inline bool
pmap_md_vca_add(struct vm_page_md *mdpg, vaddr_t va, pt_entry_t *nptep)
{
       return false;
}

static inline void
pmap_md_vca_remove(struct vm_page_md *mdpg, vaddr_t va)
{
}

static inline void
pmap_md_vca_clean(struct vm_page_md *mdpg, vaddr_t va, int op)
{
}

static inline size_t
pmap_md_tlb_asid_max(void)
{
       const register_t satp = csr_satp_read();
       const register_t test = satp | SATP_ASID;

       csr_satp_write(test);

       const register_t ret = __SHIFTOUT(csr_satp_read(), SATP_ASID);
       csr_satp_write(satp);

       KASSERT(ret < PMAP_TLB_NUM_PIDS);
       return ret;
}

static inline pt_entry_t *
pmap_md_nptep(pt_entry_t *ptep)
{
       return ptep + 1;
}

#endif /* __PMAP_PRIVATE */
#endif /* _KERNEL */

#include <uvm/pmap/pmap.h>

#endif /* !_MODULE */

#if defined(MODULAR) || defined(_MODULE)
/*
* Define a compatible vm_page_md so that struct vm_page is the same size
* whether we are using modules or not.
*/
#ifndef __HAVE_VM_PAGE_MD
#define __HAVE_VM_PAGE_MD

struct vm_page_md {
       uintptr_t mdpg_dummy[3];
};
__CTASSERT(sizeof(struct vm_page_md) == sizeof(uintptr_t)*3);

#endif /* !__HAVE_VM_PAGE_MD */

#endif /* MODULAR || _MODULE */

#endif /* !_RISCV_PMAP_H_ */

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.