On Mon, 2003-05-26 at 06:39, vincent poirson wrote: > Well, I forgot one operand in the addis instruction > but otherwise my code is OK. I checked that the right > PDATC adress was in the GPR. > I also forgot to say that my code works when I put it > in a interrupt handler in a normal kernel module. > What I do not understand is why the kernel keeps going > in machine check exception when I try to load PDATC > contents or store a value in PDATC. >
Are you sure that the address you are using is correct? In particular, this may be a mapped (via MMU) address. The physical address can often be different. When you are executing in this mode, you must use the physical address. > > > --- None Atall <linux_meis at yahoo.com> a ?crit : > You > missed a small shift... :) > > > > ----------------------- > > li r16,r16,0x10 > > li r13, 0xf001 > > slw r13,r13,r16 > > addis r13, 0x0d50 > > stw r14, 0(r13) > > ----------------------- > > > > Dimitris. > > > > --- vincent poirson <poirsonv at yahoo.fr> wrote: > > > > > > Hello, > > > > > > I want to change my PDATC value while in > > > HardwareInterrupt code (in kernel/head.S) where > > MMU > > > is > > > off. So I simply do : > > > li r13, 0x0d50 > > > addis r13, 0xf001 > > > stw r14, 0(r13) > > > // where 0xf0010d50 is my PDATC adress and r14 the > > > value I want to store > > > I do not understand why my kernel crahes and goes > > in > > > machine exception. Surprisingly, I can change > > PDATC > > > with BDI2000 but not with assembler code. Is this > > an > > > adress translation problem ? > > > Am I missing something obvious ? Any help will be > > > appreciated. > > > > > > Thanks in advance. > > > > > > > > > > > > > > > ===== > > > ------------------------------------------------------------ > > -Dhmhtrios Meidanis > > -Degree in Mathematics, University of the Aegean. > > -Master in Computer Architecture and Digital > > Systems, University of Crete. > > Greece. > > > ------------------------------------------------------------ > > > > -- Gary Thomas <gary at mlbassoc.com> MLB Associates ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
