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Remove assumptions about endianess of bus_space_vaddr mappings, replace 

with an explicit probe.
This commit is contained in:
martin 2002-11-25 21:24:28 +00:00
parent c858fe312c
commit 01740de795
1 changed files with 20 additions and 5 deletions
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25
sys/dev/pci/machfb.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: machfb.c,v 1.8 2002/11/02 15:54:10 martin Exp $ */
/* $NetBSD: machfb.c,v 1.9 2002/11/25 21:24:28 martin Exp $ */
/*
* Copyright (c) 2002 Bang Jun-Young
@ -630,6 +630,9 @@ mach64_init_screen(struct mach64_softc *sc, struct mach64screen *scr,
void
mach64_init(struct mach64_softc *sc)
{
u_int32_t *p32, saved_value;
u_int8_t *p;
int need_swap;
if (bus_space_map(sc->sc_memt, sc->sc_aperbase, sc->sc_apersize,
BUS_SPACE_MAP_LINEAR, &sc->sc_memh)) {
@ -642,10 +645,22 @@ mach64_init(struct mach64_softc *sc)
sc->sc_regsize, &sc->sc_regh);
sc->sc_regbase = sc->sc_aperbase + 0x7ffc00;
#if _BYTE_ORDER == _BIG_ENDIAN
sc->sc_aperbase += 0x800000;
sc->sc_apersize -= 0x800000;
#endif
/*
* Test wether the aperture is byte swapped or not
*/
p32 = (u_int32_t*)sc->sc_aperbase;
saved_value = *p32;
p = (u_int8_t*)sc->sc_aperbase;
*p32 = 0x12345678;
if (p[0] == 0x12 && p[1] == 0x34 && p[2] == 0x56 && p[3] == 0x78)
need_swap = 0;
else
need_swap = 1;
if (need_swap) {
sc->sc_aperbase += 0x800000;
sc->sc_apersize -= 0x800000;
}
*p32 = saved_value;
LIST_INIT(&sc->screens);
sc->active = NULL;