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try mapping the I/O space (as well as the memory space) in the probe routine.

This commit is contained in:
cgd 1996-11-20 20:04:53 +00:00
parent 0332502588
commit 31cc61b793
1 changed files with 15 additions and 5 deletions
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20
sys/arch/alpha/isa/vga_isa.c
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@ -1,4 +1,4 @@
/* $NetBSD: vga_isa.c,v 1.1 1996/11/19 04:38:34 cgd Exp $ */
/* $NetBSD: vga_isa.c,v 1.2 1996/11/20 20:04:53 cgd Exp $ */
/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
@ -61,19 +61,29 @@ int
vga_isa_probe(iot, memt)
bus_space_tag_t iot, memt;
{
bus_space_handle_t memh;
bus_space_handle_t ioh, memh;
u_int16_t vgadata;
int rv;
int gotio, gotmem, rv;
gotio = gotmem = rv = 0;
if (bus_space_map(iot, 0x3b0, 0x30, 0, &ioh))
goto bad;
gotio = 1;
if (bus_space_map(memt, 0xb8000, 0x8000, 0, &memh))
return (0);
goto bad;
gotmem = 1;
vgadata = bus_space_read_2(memt, memh, 0);
bus_space_write_2(memt, memh, 0, 0xa55a);
rv = (bus_space_read_2(memt, memh, 0) == 0xa55a);
bus_space_write_2(memt, memh, 0, vgadata);
bus_space_unmap(memt, memh, 0x8000);
bad:
if (gotmem)
bus_space_unmap(memt, memh, 0x8000);
if (gotio)
bus_space_unmap(iot, ioh, 0x30);
return (rv);
}