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Dump the 68040 mmu registers before touching them. 

Added a comment about the Milan clone which uses the mmu in the BIOS to emulate Atari hardware, and the Transparent Translation registers to map the PCI bus, which screws up with our current code.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@43073 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
François Revol 2011-11-01 18:58:18 +00:00
parent e1c6140eaa
commit f6fbf32a02
1 changed files with 43 additions and 1 deletions
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44
src/system/boot/arch/m68k/mmu_040.cpp
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@ -23,7 +23,7 @@
#include "arch_040_mmu.h"
//#define TRACE_MMU
#define TRACE_MMU
#ifdef TRACE_MMU
# define TRACE(x) dprintf x
#else
@ -33,10 +33,52 @@
extern page_root_entry *gPageRoot;
//XXX: the milan BIOS uses the mmu for itself,
// likely to virtualize missing Atari I/O ports...
// tcr: c000 (enabled, 8k pages :()
// dtt0: 803fe140 0x80000000 & ~0x3f... en ignFC2 U=1 CI,S RW
// dtt1: 403fe060 0x40000000 & ~0x3f... en ignFC2 U=0 CI,NS RW
// itt0: 803fe040 0x80000000 & ~0x3f... en ignFC2 U=0 CI,S RW
// itt1: 403fe000 0x40000000 & ~0x3f... en ignFC2 U=0 C,WT RW
// srp: 00dfde00
// urp: 00dfde00
static void
dump_mmu(void)
{
uint32 dttr0, dttr1;
uint32 ittr0, ittr1;
uint32 srp, urp;
uint32 tcr;
TRACE(("mmu_040:dump:\n"));
asm volatile("movec %%tcr,%0\n" : "=d"(tcr) :);
TRACE(("tcr:\t%08lx\n", tcr));
asm volatile("movec %%dtt0,%0\n" : "=d"(dttr0) :);
TRACE(("dtt0:\t%08lx\n", dttr0));
asm volatile("movec %%dtt1,%0\n" : "=d"(dttr1) :);
TRACE(("dtt1:\t%08lx\n", dttr1));
asm volatile("movec %%itt0,%0\n" : "=d"(ittr0) :);
TRACE(("itt0:\t%08lx\n", ittr0));
asm volatile("movec %%itt1,%0\n" : "=d"(ittr1) :);
TRACE(("itt1:\t%08lx\n", ittr1));
asm volatile("movec %%srp,%0\n" : "=d"(srp) :);
TRACE(("srp:\t%08lx\n", srp));
asm volatile("movec %%urp,%0\n" : "=d"(urp) :);
TRACE(("urp:\t%08lx\n", urp));
TRACE(("mmu_040:dump:\n"));
}
static void
initialize(void)
{
dump_mmu();
TRACE(("mmu_040:initialize\n"));
}