From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: linux-ppc-embedded <linuxppc-embedded@ozlabs.org>, support@abatron.ch
Subject: BDI2000 and Linux 2.6 kernel
Date: Mon, 7 Nov 2005 10:11:01 -0200 [thread overview]
Message-ID: <20051107121101.GI15522@logos.cnet> (raw)
Hi,
Currently gdb over BDI (and I've seen other reports on this list) fails to
translate virtual->physical addresses on PPC 8xx:
*** MMU: address translation for 0xC000C66C failed
*** MMU: address translation for 0xC000C66C failed
Thats because the v2.6 kernel was changed to use physical addresses on the
first level page.
Dan informed me there might be a firmware update available to address
this problem. Is this true?
With the following the kernel stores the virtual address on the PMD
getting the BDI "to work".
A newer firmware would be much better though.
--- linux-2.6.14-rc4.orig/arch/ppc/kernel/head_8xx.S 2005-10-18 16:59:34.000000000 -0500
+++ linux-2.6.14-rc4/arch/ppc/kernel/head_8xx.S 2005-11-01 05:45:00.000000000 -0600
@@ -320,11 +320,12 @@ InstructionTLBMiss:
lwz r11, 0(r10) /* Get the level 1 entry */
rlwinm. r10, r11,0,0,19 /* Extract page descriptor page address */
beq 2f /* If zero, don't try to find a pte */
+ tophys(r11,r11)
/* We have a pte table, so load the MI_TWC with the attributes
* for this "segment."
*/
- ori r11,r11,1 /* Set valid bit */
+ /*ori r11,r11,1 Set valid bit */
DO_8xx_CPU6(0x2b80, r3)
mtspr SPRN_MI_TWC, r11 /* Set segment attributes */
DO_8xx_CPU6(0x3b80, r3)
@@ -379,6 +380,7 @@ DataStoreTLBMiss:
lwz r11, 0(r10) /* Get the level 1 entry */
rlwinm. r10, r11,0,0,19 /* Extract page descriptor page address */
beq 2f /* If zero, don't try to find a pte */
+ tophys(r11,r11)
/* We have a pte table, so load fetch the pte from the table.
*/
@@ -493,6 +495,7 @@ DataTLBError:
lwz r11, 0(r10) /* Get the level 1 entry */
rlwinm. r10, r11,0,0,19 /* Extract page descriptor page address */
beq 2f /* If zero, bail */
+ tophys(r11,r11)
/* We have a pte table, so fetch the pte from the table.
*/
diff -Nur -p --exclude-from=linux-2.6.14-rc4/Documentation/dontdiff linux-2.6.14-rc4.orig/include/asm-ppc/pgalloc.h linux-2.6.14-rc4/include/asm-ppc/pgalloc.h
--- linux-2.6.14-rc4.orig/include/asm-ppc/pgalloc.h 2005-10-18 17:00:09.000000000 -0500
+++ linux-2.6.14-rc4/include/asm-ppc/pgalloc.h 2005-11-01 08:02:08.000000000 -0600
@@ -19,16 +19,16 @@ extern void pgd_free(pgd_t *pgd);
#define __pmd_free_tlb(tlb,x) do { } while (0)
#define pgd_populate(mm, pmd, pte) BUG()
-#ifndef CONFIG_BOOKE
+#if defined(CONFIG_BOOKE) || defined(CONFIG_8xx)
#define pmd_populate_kernel(mm, pmd, pte) \
- (pmd_val(*(pmd)) = __pa(pte) | _PMD_PRESENT)
+ (pmd_val(*(pmd)) = (unsigned long)pte | _PMD_PRESENT)
#define pmd_populate(mm, pmd, pte) \
- (pmd_val(*(pmd)) = (page_to_pfn(pte) << PAGE_SHIFT) | _PMD_PRESENT)
+ (pmd_val(*(pmd)) = (unsigned long)page_to_virt(pte) | _PMD_PRESENT)
#else
#define pmd_populate_kernel(mm, pmd, pte) \
- (pmd_val(*(pmd)) = (unsigned long)pte | _PMD_PRESENT)
+ (pmd_val(*(pmd)) = __pa(pte) | _PMD_PRESENT)
#define pmd_populate(mm, pmd, pte) \
- (pmd_val(*(pmd)) = (unsigned long)page_to_virt(pte) | _PMD_PRESENT)
+ (pmd_val(*(pmd)) = (page_to_pfn(pte) << PAGE_SHIFT) | _PMD_PRESENT)
#endif
extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
diff -Nur -p --exclude-from=linux-2.6.14-rc4/Documentation/dontdiff linux-2.6.14-rc4.orig/include/asm-ppc/pgtable.h linux-2.6.14-rc4/include/asm-ppc/pgtable.h
--- linux-2.6.14-rc4.orig/include/asm-ppc/pgtable.h 2005-10-18 17:00:09.000000000 -0500
+++ linux-2.6.14-rc4/include/asm-ppc/pgtable.h 2005-11-01 08:01:34.000000000 -0600
@@ -719,16 +719,16 @@ extern pgprot_t phys_mem_access_prot(str
* handler). On everything else the pmd contains the physical address
* of the pte page. -- paulus
*/
-#ifndef CONFIG_BOOKE
+#if defined (CONFIG_BOOKE) || defined CONFIG_8xx
#define pmd_page_kernel(pmd) \
- ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+ ((unsigned long) (pmd_val(pmd) & PAGE_MASK))
#define pmd_page(pmd) \
- (mem_map + (pmd_val(pmd) >> PAGE_SHIFT))
+ (mem_map + (__pa(pmd_val(pmd)) >> PAGE_SHIFT))
#else
#define pmd_page_kernel(pmd) \
- ((unsigned long) (pmd_val(pmd) & PAGE_MASK))
+ ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
#define pmd_page(pmd) \
- (mem_map + (__pa(pmd_val(pmd)) >> PAGE_SHIFT))
+ (mem_map + (pmd_val(pmd) >> PAGE_SHIFT))
#endif
/* to find an entry in a kernel page-table-directory */
next reply other threads:[~2005-11-07 17:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-07 12:11 Marcelo Tosatti [this message]
2005-11-14 23:42 ` BDI2000 and Linux 2.6 kernel Guillaume Autran
2005-11-15 5:46 ` Marcelo Tosatti
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20051107121101.GI15522@logos.cnet \
--to=marcelo.tosatti@cyclades.com \
--cc=linuxppc-embedded@ozlabs.org \
--cc=support@abatron.ch \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).