diff options
| author | David Gibson <david@gibson.dropbear.id.au> | 2011-04-01 15:15:23 +1100 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2011-04-01 18:34:56 +0200 |
| commit | 39ac8455106af1ed669b8e10223420cf1ac5b190 (patch) | |
| tree | 48c935a56286ff50f76982c9d7aab1a0eb835e03 /pc-bios/spapr-rtas/spapr-rtas.S | |
| parent | f43e35255cffb6ac6230dd09d308f7909f823f96 (diff) | |
Implement hcall based RTAS for pSeries machines
On pSeries machines, operating systems can instantiate "RTAS" (Run-Time
Abstraction Services), a runtime component of the firmware which implements
a number of low-level, infrequently used operations. On logical partitions
under a hypervisor, many of the RTAS functions require hypervisor
privilege. For simplicity, therefore, hypervisor systems typically
implement the in-partition RTAS as just a tiny wrapper around a hypercall
which actually implements the various RTAS functions.
This patch implements such a hypercall based RTAS for our emulated pSeries
machine. A tiny in-partition "firmware" calls a new hypercall, which
looks up available RTAS services in a table.
Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'pc-bios/spapr-rtas/spapr-rtas.S')
| -rw-r--r-- | pc-bios/spapr-rtas/spapr-rtas.S | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/pc-bios/spapr-rtas/spapr-rtas.S b/pc-bios/spapr-rtas/spapr-rtas.S new file mode 100644 index 0000000000..903bec2150 --- /dev/null +++ b/pc-bios/spapr-rtas/spapr-rtas.S @@ -0,0 +1,37 @@ +/* + * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator + * + * Trivial in-partition RTAS implementation, based on a hypercall + * + * Copyright (c) 2010,2011 David Gibson, IBM Corporation. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + * + */ + +#define KVMPPC_HCALL_BASE 0xf000 +#define KVMPPC_H_RTAS (KVMPPC_HCALL_BASE + 0x0) + +.globl _start +_start: + mr 4,3 + lis 3,KVMPPC_H_RTAS@h + ori 3,3,KVMPPC_H_RTAS@l + sc 1 + blr |