On Thu, Sep 14, 2006 at 04:43:33PM -0700, keith mannthey wrote:
> On Thu, 2006-09-14 at 16:21 -0700, Dave Hansen wrote:
> > On Thu, 2006-09-14 at 19:04 -0400, Vivek Goyal wrote:
> > > I think I know what is going on wrong here. boot_ioremap() is assuming
> > > that only first 8MB of physical memory is being mapped and while
> > > calculating the index into page table (boot_pte_index) we will truncate
> > > any higher address bits.
> >
> > Vivek, are those pte pages still all contiguous?
> >
> > Yeah, that's probably it. Keith, I'm trying to think of reasons why we
> > need the mask here:
> >
> > #define boot_pte_index(address) \
> > (((address) >> PAGE_SHIFT) & (BOOT_PTE_PTRS - 1))
> >
> > and I can't think of any other than just masking out the top of the
> > virtual address. You could do this a bunch of other ways, like __pa().
> >
> > This might just work:
> >
> > static unsigned long boot_pte_index(unsigned long vaddr)
> > {
> > return __pa(vaddr) >> PAGE_SHIFT;
> > }
> With
> CONFIG_KEXEC=y
> CONFIG_CRASH_DUMP=y
> CONFIG_PHYSICAL_START=0x1000000
> and the above __pa(vaddr) >> PAGE_SHIFT changed things worked for me but
> I am still confused as to why the pte we set is c1686f6c and we flush
> and return c13db000.
I think c13db000 is the virtual address of symbol boot_ioremap_space,
and we are remapping this virtual address to physical addres eff9c063,
that's why we flush tlb for this virtual address.
I guess c1686f6c is virtual address of PTE (somewhere between pg0 to pg5).
It is independent of actual virtual address (boot_ioremap_space) being
remapped.
Thanks
Vivek
>
> get_memcfg_from_srat: assigning address to rsdp fdfc0
> RSD PTR v0 [IBM ]
> rsdp->rsdt_address eff9c2c0
> boot_ioremap phys_addr = eff9c2c0 long = 44
> __boot_ioremap phys_addr = eff9c000 pages = 1 source c13db000
> setting pte c1686f6c to eff9c063
> just flushed c13db000
> boot_ioremap and I return c13db2c0
> rsdt = c13db2c0 header is RSDT4
> Begin SRAT table scan....
>
> thanks,
> Keith
>
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