/*      $NetBSD: vmparam.h,v 1.14 2023/05/07 12:41:48 skrll Exp $       */

/*-
* Copyright (c) 2014, 2020 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, 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_VMPARAM_H_
#define _RISCV_VMPARAM_H_

#include <riscv/param.h>

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

/*
* Machine dependent VM constants for RISCV.
*/

/*
* We use a 4K page on both RV64 and RV32 systems.
* Override PAGE_* definitions to compile-time constants.
*/
#define PAGE_SHIFT      PGSHIFT
#define PAGE_SIZE       (1 << PAGE_SHIFT)
#define PAGE_MASK       (PAGE_SIZE - 1)

/*
* USRSTACK is the top (end) of the user stack.
*
* USRSTACK needs to start a page below the maxuser address so that a memory
* access with a maximum displacement (0x7ff) won't cross into the kernel's
* address space.  We use PAGE_SIZE instead of 0x800 since these need to be
* page-aligned.
*/
#define USRSTACK        (VM_MAXUSER_ADDRESS - PAGE_SIZE) /* Start of user stack */
#define USRSTACK32      ((uint32_t)VM_MAXUSER_ADDRESS32 - PAGE_SIZE)

/*
* Virtual memory related constants, all in bytes
*/
#ifndef MAXTSIZ
#define MAXTSIZ         (128*1024*1024)         /* max text size */
#endif
#ifndef DFLDSIZ
#define DFLDSIZ         (256*1024*1024)         /* initial data size limit */
#endif
#ifndef MAXDSIZ
#define MAXDSIZ         (1536*1024*1024)        /* max data size */
#endif
#ifndef DFLSSIZ
#define DFLSSIZ         (4*1024*1024)           /* initial stack size limit */
#endif
#ifndef MAXSSIZ
#define MAXSSIZ         (120*1024*1024)         /* max stack size */
#endif

/*
* Virtual memory related constants, all in bytes
*/
#ifndef DFLDSIZ32
#define DFLDSIZ32       DFLDSIZ                 /* initial data size limit */
#endif
#ifndef MAXDSIZ32
#define MAXDSIZ32       MAXDSIZ                 /* max data size */
#endif
#ifndef DFLSSIZ32
#define DFLSSIZ32       DFLTSIZ                 /* initial stack size limit */
#endif
#ifndef MAXSSIZ32
#define MAXSSIZ32       MAXSSIZ                 /* max stack size */
#endif

/*
* PTEs for mapping user space into the kernel for phyio operations.
* The default PTE number is enough to cover 8 disks * MAXBSIZE.
*/
#ifndef USRIOSIZE
#define USRIOSIZE       (MAXBSIZE/PAGE_SIZE * 8)
#endif

/*
* User/kernel map constants.
*/
#define VM_MIN_ADDRESS          ((vaddr_t)PAGE_SIZE)
#ifdef _LP64    /* Sv39 / Sv48 / Sv57 */
/*
* SV39 gives 1 << (39 - 1) address space to kernel and same to userland.
* This is 256GiB each. Split the kernel space in two and use the top half
* for direct map.
*
* kernel virtual space layout:
*   0xffff_ffc0_0000_0000  -   64GiB  KERNEL VM Space (inc. text/data/bss)
*  (0xffff_ffc0_4000_0000      +1GiB) KERNEL VM start of KVA
*  (0xffff_ffd0_0000_0000      64GiB) reserved
*   0xffff_ffe0_0000_0000  -  128GiB  direct mapping
*/
#define VM_MAXUSER_ADDRESS      ((vaddr_t)0x0000004000000000 - 16 * PAGE_SIZE)
#define VM_MIN_KERNEL_ADDRESS   ((vaddr_t)0xffffffc000000000)
#define VM_MAX_KERNEL_ADDRESS   ((vaddr_t)0xffffffd000000000)

#else           /* Sv32 */
/*
* kernel virtual space layout:
*   0x8000_0000  -   64GiB  KERNEL VM Space (inc. text/data/bss)
*  (0x4000_0000      +1GiB) KERNEL VM start of KVA
*  (0x0000_0000      64GiB) reserved
*/

/*
* kernel virtual space layout without direct map (common case)
*
*   0x8000_0000 -  256MB kernel text/data/bss
*   0x9000_0000 - 1536MB Kernel VM Space
*   0xf000_0000 -  256MB IO
*
* kernel virtual space layout with KASAN
*
*   0x8000_0000 -  256MB kernel text/data/bss
*   0x9000_0000 -  768MB Kernel VM Space
*   0xc000_0000 -  128MB (KASAN SHADOW MAP)
*   0xc800_0000 -  640MB (spare)
*   0xf000_0000 -  256MB IO
*
* kernel virtual space layout with direct map (1GB limited)
*   0x8000_0000 - 1024MB kernel text/data/bss and direct map start
*   0xc000_0000 -  768MB Kernel VM Space
*   0xf000_0000 -  256MB IO
*
*/



#define VM_MAXUSER_ADDRESS      ((vaddr_t)-0x7fffffff-1)/* 0xffff_ffff_8000_0000 */
#define VM_MIN_KERNEL_ADDRESS   ((vaddr_t)-0x7fffffff-1)/* 0xffff_ffff_8000_0000 */
#define VM_MAX_KERNEL_ADDRESS   ((vaddr_t)-0x10000000)  /* 0xffff_ffff_f000_0000 */

#endif
#define VM_KERNEL_BASE          VM_MIN_KERNEL_ADDRESS
#define VM_KERNEL_SIZE          0x2000000       /* 32 MiB (8 / 16 megapages) */
#define VM_KERNEL_DTB_BASE      (VM_KERNEL_BASE + VM_KERNEL_SIZE)
#define VM_KERNEL_DTB_SIZE      0x1000000       /* 16 MiB (4 / 8 megapages) */
#define VM_KERNEL_IO_BASE       (VM_KERNEL_DTB_BASE + VM_KERNEL_DTB_SIZE)
#define VM_KERNEL_IO_SIZE       0x1000000       /* 16 MiB (4 / 8 megapages) */

#define VM_KERNEL_RESERVED      (VM_KERNEL_SIZE + VM_KERNEL_DTB_SIZE + VM_KERNEL_IO_SIZE)

#define VM_KERNEL_VM_BASE       (VM_MIN_KERNEL_ADDRESS + VM_KERNEL_RESERVED)
#define VM_KERNEL_VM_SIZE       (VM_MAX_KERNEL_ADDRESS - VM_KERNEL_VM_BASE)

#define VM_MAX_ADDRESS          VM_MAXUSER_ADDRESS
#define VM_MAXUSER_ADDRESS32    ((vaddr_t)(1UL << 31))/* 0x0000000080000000 */

#ifdef _LP64
/*
* Since we have the address space, we map all of physical memory (RAM)
* using gigapages on SV39, terapages on SV48 and petapages on SV57.
*/
#define RISCV_DIRECTMAP_MASK    ((vaddr_t) 0xffffffe000000000L)
#define RISCV_DIRECTMAP_SIZE    (-RISCV_DIRECTMAP_MASK - PAGE_SIZE)     /* 128GiB */
#define RISCV_DIRECTMAP_START   RISCV_DIRECTMAP_MASK
#define RISCV_DIRECTMAP_END     (RISCV_DIRECTMAP_START + RISCV_DIRECTMAP_SIZE)
#define RISCV_DIRECTMAP_P(va)   (((vaddr_t) (va) & RISCV_DIRECTMAP_MASK) == RISCV_DIRECTMAP_MASK)
#define RISCV_PA_TO_KVA(pa)     ((vaddr_t) ((pa) | RISCV_DIRECTMAP_START))
#define RISCV_KVA_TO_PA(va)     ((paddr_t) ((va) & ~RISCV_DIRECTMAP_MASK))
#endif

/*
* The address to which unspecified mapping requests default
*/
#define __USE_TOPDOWN_VM

#define VM_DEFAULT_ADDRESS_TOPDOWN(da, sz) \
   trunc_page(USRSTACK - MAXSSIZ - (sz) - user_stack_guard_size)
#define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \
   round_page((vaddr_t)(da) + (vsize_t)maxdmap)

#define VM_DEFAULT_ADDRESS32_TOPDOWN(da, sz) \
   trunc_page(USRSTACK32 - MAXSSIZ32 - (sz) - user_stack_guard_size)
#define VM_DEFAULT_ADDRESS32_BOTTOMUP(da, sz) \
   round_page((vaddr_t)(da) + (vsize_t)MAXDSIZ32)

/* virtual sizes (bytes) for various kernel submaps */
#define VM_PHYS_SIZE            (USRIOSIZE*PAGE_SIZE)

/*
* max number of non-contig chunks of physical RAM you can have
*/
#define VM_PHYSSEG_MAX          64

/*
* when converting a physical address to a vm_page structure, we
* want to use a binary search on the chunks of physical memory
* to find our RAM
*/
#define VM_PHYSSEG_STRAT        VM_PSTRAT_BSEARCH

#ifndef VM_NFREELIST
#define VM_NFREELIST            2       /* 2 distinct memory segments */
#define VM_FREELIST_DEFAULT     0
#define VM_FREELIST_DIRECTMAP   1
#endif

#ifdef _KERNEL
#ifdef _LP64
void *  cpu_uarea_alloc(bool);
bool    cpu_uarea_free(void *);
#endif
#endif

#endif /* ! _RISCV_VMPARAM_H_ */

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