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/* SPDX-License-Identifier: copyleft-next-0.3.1 */
/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
#ifndef KMI_RISCV_CONFIG_H
#define KMI_RISCV_CONFIG_H
/**
* @file config.h
* riscv64 specific configuration parameters, currently mixing user-specified
* and immutable parameters. Included on the command line by
* -include.
*
* Assume Sv39, probably wouldn't be too difficult to use runtime parameters
* instead. First 4K is reserved for NULL, but I suppose it could be mapped
* later if *absolutely* necessary.
*
* \todo Consider separating user-specified and immutable parameters.
* \todo Write more thorough documentation, maybe a separate .md file?
*/
#include <kmi/sizes.h>
/* --- START ARCH USER CONFIG VALUES --- */
/* nada for now */
/* --- END ARCH USER CONFIG VALUES --- */
/* don't touch >:( */
#if __riscv_xlen == 64
/* 64bit */
/** Direct map offset. */
#define VM_DMAP (0xffffffc000000000) /* testing for now */
/** Page reserved for kernel mapping in O1 */
#define KERNEL_PAGE 510UL
/** Kernel virtual address */
#define VM_KERNEL (0xffffffff80000000)
/** Page reserved for kernel I/O. */
#define IO_PAGE 511UL
/** Direct mapping starts from this page. */
#define KSTART_PAGE 256UL
/**
* The RPC stack page.
* @todo this should be page before KSTART, but currently
* RPC_STACK_TOP is too low (why? was there a reason to place it so low?) and overlaps.
*/
#define CSTACK_PAGE 248UL
/** User virtual memory space start. Should essentially always be the start of
* the NULL page, which is marked reserved in the address space by \ref init_uvmem().*/
#define UVMEM_START (0)
/** User virtual memory space end. */
#define UVMEM_END (SZ_256G - SZ_8G)
/** RPC stack base. */
#define RPC_STACK_BASE (UVMEM_END)
/**
* Size of the default top page.
* For now we're only targeting Sv39, so this can easily be a macro.
* Eventually it might have to be turned into a function call to support Sv48
* etc.
*/
#define TOP_PAGE_SIZE SZ_1G
/** Default Sv mode on rv64 in kmi. */
#define DEFAULT_Sv_MODE Sv39
#else
/* 32bit */
/** \todo figure this stuff out */
#define VM_DMAP 0x80000000 /* works on qemu at least */
#define IO_PAGE 1023UL
#define KSTART_PAGE 512UL
#define CSTACK_PAGE 511UL
#define UVMEM_START (SZ_4K)
#define UVMEM_END (SZ_2G - SZ_8M)
#define RPC_STACK_TOP (UVMEM_END)
#define RPC_STACK_BASE (RPC_STACK_TOP - SZ_8M)
#define TOP_PAGE_SIZE SZ_4M
#define DEFAULT_Sv_MODE Sv32
#endif
#endif /* KMI_RISCV_CONFIG_H */
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