From: Pantelis Antoniou <panto@intracom•gr>
To: LinuxPPC <linuxppc-embedded@lists•linuxppc.org>,
Paul Mackerras <paulus@samba•org>,
Dan Malek <dan@embeddededge•com>,
Tom Rini <trini@kernel•crashing.org>
Subject: [2.5] Hang on 8xx in head_8xx.S
Date: Thu, 13 Feb 2003 15:27:42 +0200 [thread overview]
Message-ID: <3E4B9D4E.7080808@intracom.gr> (raw)
Hello
I'm trying to make 2.5 work for 8xx processors.
After some tweaking it compiles, but now it hangs
in arch/ppc/kernel/head_8xx.S at the marked point
below.
I know this is not enough to make it work, since
it appears that the calling convention and registers
used for exception are changed between 2.4 <-> 2.5.
I could use some help in trying to understand what's going on.
Regards
Pantelis
/*
* Go back to running unmapped so we can load up new values
* and change to using our exception vectors.
* On the 8xx, all we have to do is invalidate the TLB to clear
* the old 8M byte TLB mappings and load the page table base register.
*/
/* The right way to do this would be to track it down through
* init's THREAD like the context switch code does, but this is
* easier......until someone changes init's static structures.
*/
lis r6, swapper_pg_dir@h
ori r6, r6, swapper_pg_dir@l
tophys(r6,r6)
#ifdef CONFIG_8xx_CPU6
lis r4, cpu6_errata_word@h
ori r4, r4, cpu6_errata_word@l
li r3, 0x3980
stw r3, 12(r4)
lwz r3, 12(r4)
#endif
mtspr M_TWB, r6
lis r4,2f@h
ori r4,r4,2f@l
tophys(r4,r4)
li r3,MSR_KERNEL & ~(MSR_IR|MSR_DR)
mtspr SRR0,r4
mtspr SRR1,r3
---> Gets here <---
rfi
2:
---> Never gets here <---
SYNC /* Force all PTE updates to finish */
tlbia /* Clear all TLB entries */
sync /* wait for tlbia/tlbie to finish */
TLBSYNC /* ... on all CPUs */
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next reply other threads:[~2003-02-13 13:27 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-13 13:27 Pantelis Antoniou [this message]
2003-02-13 16:50 ` [2.5] Hang on 8xx in head_8xx.S Dan Malek
2003-02-14 7:33 ` Pantelis Antoniou
2003-02-14 13:38 ` Dan Malek
2003-02-14 14:07 ` Pantelis Antoniou
2003-02-14 20:31 ` Dan Malek
2003-02-14 21:30 ` Pantelis Antoniou
2003-02-16 17:12 ` Dan Malek
2003-02-16 19:38 ` Allen Curtis
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