92 lines
1.9 KiB
ArmAsm
92 lines
1.9 KiB
ArmAsm
/*
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* .seg "data"
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* .asciz "@(#)map.s 1.1 10/31/94 SMI"
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* Copyright (c) 1988,1990 by Sun Microsystems, Inc.
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*/
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#ifdef sun4m
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/*
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* srmmu stuff comes from PROM now. Design to be reviewed by Mitch.
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* Equivalent srmmu routines have been coded and tested in mapin.c.
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* They cannot be used until we have the some more Open Boot features
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* from the proms.
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*/
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#else sun4m
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.seg "text"
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.align 4
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/*
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* Memory Mapping for Sun 4c
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*
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* The following subroutines accept any address in the mappable range
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* (256 megs). They access the map for the current context register. They
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* assume that currently we are running in supervisor state.
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*/
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#include <machine/asm_linkage.h>
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#include <machine/mmu.h>
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#define CONTEXTBASE 0x30000000 /* context reg */
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#define SEGMENTADDRBITS 0xFFFC0000 /* segment map virtual address mask */
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/*
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* Set the pme for address v using the software pte given.
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*
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* setpgmap(v, pte)
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* caddr_t v;
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* long pte;
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*/
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ENTRY(setpgmap)
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andn %o0,0x3,%o2 ! align to word boundary
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retl
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sta %o1,[%o2]ASI_PM ! write page map entry
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/*
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* Read the page map entry for the given address v
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* and return it in a form suitable for software use.
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*
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* long
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* getpgmap(v)
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* caddr_t v;
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*/
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ENTRY(getpgmap)
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andn %o0,0x3,%o1 ! align to word boundary
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retl
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lda [%o1]ASI_PM,%o0 ! read page map entry
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/*
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* Set the segment map entry for segno to pm.
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*
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* setsegmap(segno, pm)
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* u_int segno;
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* u_short pm;
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*/
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ENTRY(setsegmap)
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set SEGMENTADDRBITS, %o2
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and %o0, %o2, %o0 ! get relevant segment address bits
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retl
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stha %o1,[%o0]ASI_SM ! write segment entry
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/*
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* Get the segment map entry for the given virtual address
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*
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* getsegmap(vaddr)
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* caddr_t vaddr;
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*/
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ENTRY(getsegmap)
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retl
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lduba [%o0]ASI_SM,%o0 ! read segment entry
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/*
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* Set the current [user] context number to uc.
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*
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* setcontext(uc)
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* int uc;
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*/
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ENTRY(setcontext)
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set CONTEXTBASE, %o1
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retl
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stba %o0, [%o1]ASI_CTL ! write the context register
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#endif sun4m
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