While booting a 64bit kernel, there is a small timeframe where OF and the kernel communicate with each other. Within that timeframe, DSI/ISI interrupts may occur, because some memory is not mapped yet.
Right now in case that happens, we jump into the DSI/ISI interrupt handler which clobbers the high 32 bits of the kernel's registers. In order to circumvent that, let's save/restore all 64 bits of all kernel registers when we get a DSI/ISI interrupt.
This patch enables a PPC64 Linux kernel to boot up to the point where it tries to set up the SLB entries (slbmte), which is not yet implemented in qemu.
v2 implements handling for the HIOR register, bringing interrupt handlers to RAM.
Signed-off-by: Alexander Graf <alex@csgraf.de>
git-svn-id: svn://coreboot.org/openbios/openbios-devel@462 f158a5a8-5612-0410-a976-696ce0be7e32
"PowerPC Processor binding to:
IEEE 1275-1994, Standard for Boot (Initialization, Configuration) Firmware
Revision: 2.1 (Approved Version), November 6, 1996"
7.1 Calling Convention:
Client interface preserves: msr, cr, r1, r2, r13-r31, sprg0-3, fpscr, f0-f31,
sr0-sr15, other SPRs.
This patch modifies of_client_callback(), to preserve r1, r2, r4-r31.
This is needed to be able to execute the first stage of quik which
supposes r7 is unmodified.
git-svn-id: svn://coreboot.org/openbios/openbios-devel@384 f158a5a8-5612-0410-a976-696ce0be7e32
Move non-vector code to higher memory addresses to free vector area.
Rename entry point _start to _entry so that it will not conflict with
ldscript _start.
git-svn-id: svn://coreboot.org/openbios/openbios-devel@348 f158a5a8-5612-0410-a976-696ce0be7e32
This patches copies all needed ppc files to qemu and modifies them.
The generated OpenBIOS image must be loaded at adresse 0xfff00000 by Qemu.
It is able to load Yaboot from disk and Yaboot is able to load Linux, but Linux hangs somewhere... of course it needs more work (but this cleans up my patch queue).
Thank you to Blue Swirl and Aurelien Jarno for their help.
Signed-off-by: Laurent Vivier <Laurent@lvivier.info>
git-svn-id: svn://coreboot.org/openbios/openbios-devel@301 f158a5a8-5612-0410-a976-696ce0be7e32
