Messages in this thread | | | Date | Tue, 11 Sep 2007 16:33:02 +0530 | From | mkrameshid <> | Subject | Re: Calling PnP bios routines like get device node from x86_84 arch |
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Hi Alan, Thanks for your quick reply.
Actually I want to call the BIOS run time functions as per the PNPBIOSSpecification-v1.0a (attached). Specifically I want to call the function no 0x0 to 0x03. I have Dual-Core AMD Opteron(tm) Processor 2216 and AMI BIOS with the pnp bios support. So I could call this functions using the default PnP driver which comes along with the (API: call_pnp_bios()) i386 architecture. This driver is only available for i386. But not for x86_64.
So I am trying to implement a driver similar to this for x86_64 arch. But I couldn't . Because there is need for get_cpu_gdt_table() which is not available in x86_64. And also some inline asm needs to be totally modify for x86_64. For this
How can I achive this ? Is there any other alternate idea there instead of pnp driver?
Please help on this.
-mkr
Alan Cox wrote: > On Mon, 10 Sep 2007 08:06:20 -0700 (PDT) > PnP driver <mkrameshid@gmail.com> wrote: > > >> Hi, >> I am very new to linux kernel driver development. I need to develop a >> driver for calling BIOS routines like get device node. I could call it >> in i386 architecture using the PnP driver. >> > > We use ACPI on AMD64 so you should be parsing the ACPI tables not trying > to rely on legacy interfaces which if I rememeber the spec rightly aren't > even guaranteed safe to call when ACPI is active. > > What are you actually trying to achieve. > > >> But in x86_64 arch I couldn't see any support. Even I tried to >> implement it similar to the i386. But there is no API get_cpu_gdt_table(). >> Is there any other way to get the cpu_gdt_table? or any other way to >> call the BIOS routines. >> > > Assuming you even have a BIOS - you may have EFI underlying or > Linuxbios or be a virtual machine. > >
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