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Use BAT to map Openfirmware work area.

This commit is contained in:
tsubai 1998-07-02 18:21:03 +00:00
parent 29f991cc2f
commit ee91417fc2
1 changed files with 36 additions and 38 deletions
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74
sys/arch/macppc/macppc/machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.6 1998/06/26 14:18:08 tsubai Exp $ */
/* $NetBSD: machdep.c,v 1.7 1998/07/02 18:21:03 tsubai Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -81,6 +81,7 @@
#include <machine/trap.h>
#include <dev/cons.h>
#include <dev/ofw/openfirm.h>
#include "adb.h"
@ -125,7 +126,6 @@ int bufpages = 0;
caddr_t allocsys __P((caddr_t));
void install_extint __P((void (*)(void)));
static void ofwinit __P((void));
extern u_int openfirmware_entry;
static u_int ofw_va, ofw_pa, ofw_len;
@ -219,23 +219,51 @@ initppc(startkernel, endkernel, args)
asm volatile ("mtdbatu 3,%0" :: "r"(0));
/*
* Set up initial BAT table to only map the lowest 256 MB area
* Set up BAT0 to only map the lowest 256 MB area
*/
battable[0].batl = BATL(0x00000000, BAT_M);
battable[0].batu = BATU(0x00000000);
/*
* BAT1 maps Openfirmware working area
*/
battable[1].batl = ofw_pa | 0x02;
battable[1].batu = 0xff80001e; /* 1MB */
/*
* BAT2 maps most I/O devices
* 0xf0000000-0xf7ffffff (128MB) --> 0xf0000000-
*/
battable[2].batl = 0xf0000002 | BAT_I;
battable[2].batu = 0xf0000ffe;
/*
* BAT3 maps video ram
* (XXX upper half slots only...)
*/
battable[3].batl = BATL(0x80000000, BAT_I);
battable[3].batu = BATU(0x80000000);
/*
* Now setup fixed bat registers
*
* Note that we still run in real mode, and the BAT
* registers were cleared above.
*/
/* IBAT0 used for initial 256 MB segment */
asm volatile ("mtibatl 0,%0; mtibatu 0,%1"
:: "r"(battable[0].batl), "r"(battable[0].batu));
/* DBAT0 used similar */
asm volatile ("mtdbatl 0,%0; mtdbatu 0,%1"
/* BAT0 used for initial 256 MB segment */
asm volatile ("mtibatl 0,%0; mtibatu 0,%1;"
"mtdbatl 0,%0; mtdbatu 0,%1;"
:: "r"(battable[0].batl), "r"(battable[0].batu));
/* BAT1 Openfirmware */
asm volatile ("mtdbatl 1,%0; mtdbatu 1,%1;"
"mtibatl 1,%0; mtibatu 1,%1;"
:: "r"(battable[1].batl), "r"(battable[1].batu));
/* BAT2 obio devices */
asm volatile ("mtdbatl 2,%0; mtdbatu 2,%1"
:: "r"(battable[2].batl), "r"(battable[2].batu));
/* BAT3 video ram */
asm volatile ("mtdbatl 3,%0; mtdbatu 3,%1"
:: "r"(battable[3].batl), "r"(battable[3].batu));
/*
* Set up trap vectors
@ -341,36 +369,6 @@ initppc(startkernel, endkernel, args)
* Initialize pmap module.
*/
pmap_bootstrap(startkernel, endkernel);
/*
* Map Openfirmware address into the kernel space.
*/
ofwinit();
}
void
ofwinit()
{
int len = ofw_len;
u_int pa = ofw_pa;
u_int va = ofw_va;
/*
* Map 0xf0000000 - 0xf7ffffff (128MB) --> 0xf0000000 -
*/
battable[1].batl = 0xf0000002 | BAT_I;
battable[1].batu = 0xf0000ffe;
/* DBAT1 used for mapping I/O devices */
asm volatile ("mtdbatl 1,%0; mtdbatu 1,%1"
:: "r"(battable[1].batl), "r"(battable[1].batu));
while (len > 0) {
pmap_enter(pmap_kernel(), va, pa, VM_PROT_ALL, 1);
pa += NBPG;
va += NBPG;
len -= NBPG;
}
}
/*