138 lines
4.2 KiB
C
138 lines
4.2 KiB
C
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/*
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* Copyright (C) 2016 Giacomo Tesio <giacomo@tesio.it>
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*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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/*
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* Memory and machine-specific definitions. Used in C and assembler.
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*/
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/*
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* unfortunately, GAS does not accept [u]l* suffixes, then we must to avoid them.
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* https://sourceware.org/bugzilla/show_bug.cgi?id=190
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*
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* gULL add ull when __ASSEMBLER__ is not defined
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*/
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#ifdef __ASSEMBLER__
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# define gULL(u) (u)
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#else
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# define gULL(u) (u##ull)
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#endif
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#define KiB gULL(1024)
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#define MiB gULL(1048576)
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#define GiB gULL(1073741824)
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#define TiB gULL(1099511627776)
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#define PiB gULL(1125899906842624)
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#define EiB gULL(1152921504606846976)
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#define HOWMANY(x, y) (((x)+((y)-1))/(y))
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#define ROUND(s, sz) (((s)+(sz-1))&~(sz-1))
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#define ROUNDUP(x, y) (HOWMANY((x), (y))*(y))
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#define ROUNDDN(x, y) (((x)/(y))*(y))
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#define MIN(a, b) ((a) < (b)? (a): (b))
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#define MAX(a, b) ((a) > (b)? (a): (b))
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/*
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* Sizes
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*/
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#define BI2BY 8 /* bits per byte */
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#define BI2WD 32 /* bits per word */
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#define BY2WD 4 /* bytes per word */
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#define BY2V 8 /* bytes per double word */
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#define BY2SE 8 /* bytes per stack element */
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#define BLOCKALIGN 8
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#define PGSZ (4*KiB) /* page size */
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#define PGSHFT 12 /* log(PGSZ) */
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#define PTSZ (4*KiB) /* page table page size */
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#define PTSHFT 9 /* */
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#define MACHSZ (4*KiB) /* Mach+stack size */
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#define MACHMAX 32 /* max. number of cpus */
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#define MACHSTKSZ (6*(4*KiB)) /* Mach stack size */
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#define KSTACK (16*1024) /* Size of Proc kernel stack */
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#define STACKALIGN(sp) ((sp) & ~(BY2SE-1)) /* bug: assure with alloc */
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/*
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* Time
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*/
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#define HZ (100) /* clock frequency */
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#define MS2HZ (1000/HZ) /* millisec per clock tick */
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#define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
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/*
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* Address spaces
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*
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* (Kernel gets loaded at 1*MiB+64*KiB.
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* mem from 0 to the end of kernel is not used for other things.)
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*
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* User is at low addresses; kernel vm starts at KZERO
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* KSEG0 maps the first TMFM bytes, one to one,(i.e KZERO)
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* KSEG1 maps the PML4 into itself.
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* KSEG2 maps all remaining physical memory. (from TMFM up).
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*/
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#define UTZERO (0+2*MiB) /* first address in user text */
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#define UTROUND(t) ROUNDUP((t), 2*MiB) /* first address beyond text for user data */
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#define USTKTOP gULL(0x00007ffffffff000)
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#define USTKSIZE (16*1024*1024) /* size of user stack */
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#define TSTKTOP (USTKTOP-USTKSIZE) /* end of new stack in sysexec */
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#define KSEG0 gULL(0xfffffffff0000000) /* 256MB - this is confused */
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#define KSEG1 gULL(0xffffff0000000000) /* 512GB - embedded PML4 */
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#define KSEG2 gULL(0xfffffe0000000000) /* 1TB - KMAP */
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#define PMAPADDR gULL(0xffffffffffe00000) /* unused as of yet (KMAP?) */
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#define KZERO gULL(0xfffffffff0000000)
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#define KTZERO (KZERO+1*MiB+64*KiB)
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/*
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* virtual MMU
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*/
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#define PTEMAPMEM (1ull*MiB)
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#define PTEPERTAB (PTEMAPMEM/PGSZ)
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#define SEGMAPSIZE 65536
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#define SSEGMAPSIZE 16
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#define SEGMAXPG (SEGMAPSIZE)
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/*
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* This is the interface between fixfault and mmuput.
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* Should be in port.
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*/
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#define PTEVALID (1<<0)
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#define PTEWRITE (1<<1)
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#define PTERONLY (0<<1)
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#define PTEUSER (1<<2)
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#define PTEUNCACHED (1<<4)
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#define getpgcolor(a) 0
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/*
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* Hierarchical Page Tables.
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* For example, traditional IA-32 paging structures have 2 levels,
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* level 1 is the PD, and level 0 the PT pages; with IA-32e paging,
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* level 3 is the PML4(!), level 2 the PDP, level 1 the PD,
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* and level 0 the PT pages. The PTLX macro gives an index into the
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* page-table page at level 'l' for the virtual address 'v'.
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*/
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#define PTLX(v, l) (((v)>>(((l)*PTSHFT)+PGSHFT)) & ((1<<PTSHFT)-1))
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#define PGLSZ(l) (1<<(((l)*PTSHFT)+PGSHFT))
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#define TMFM ((256-32)*MiB) /* GAK kernel memory */
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/* this can go when the arguments to mmuput change */
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#define PPN(x) ((x) & ~(PGSZ-1)) /* GAK */
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#define CACHELINESZ 64
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#define KVATOP (KSEG0&KSEG1&KSEG2)
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#define iskaddr(a) (((uintptr_t)(a)&KVATOP) == KVATOP)
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