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39ac845510
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>
131 lines
4 KiB
C
131 lines
4 KiB
C
/*
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* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
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*
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* Hypercall based emulated RTAS
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*
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* Copyright (c) 2010-2011 David Gibson, IBM Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*/
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#include "cpu.h"
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#include "sysemu.h"
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#include "qemu-char.h"
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#include "hw/qdev.h"
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#include "device_tree.h"
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#include "hw/spapr.h"
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#include "hw/spapr_vio.h"
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#include <libfdt.h>
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#define TOKEN_BASE 0x2000
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#define TOKEN_MAX 0x100
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static struct rtas_call {
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const char *name;
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spapr_rtas_fn fn;
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} rtas_table[TOKEN_MAX];
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struct rtas_call *rtas_next = rtas_table;
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target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
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uint32_t token, uint32_t nargs, target_ulong args,
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uint32_t nret, target_ulong rets)
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{
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if ((token >= TOKEN_BASE)
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&& ((token - TOKEN_BASE) < TOKEN_MAX)) {
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struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
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if (call->fn) {
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call->fn(spapr, token, nargs, args, nret, rets);
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return H_SUCCESS;
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}
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}
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hcall_dprintf("Unknown RTAS token 0x%x\n", token);
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rtas_st(rets, 0, -3);
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return H_PARAMETER;
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}
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void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
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{
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assert(rtas_next < (rtas_table + TOKEN_MAX));
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rtas_next->name = name;
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rtas_next->fn = fn;
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rtas_next++;
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}
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int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr,
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target_phys_addr_t rtas_size)
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{
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int ret;
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int i;
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ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
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if (ret < 0) {
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fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
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fdt_strerror(ret));
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return ret;
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}
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ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
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rtas_addr);
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if (ret < 0) {
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fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
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fdt_strerror(ret));
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return ret;
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}
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ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
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rtas_addr);
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if (ret < 0) {
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fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
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fdt_strerror(ret));
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return ret;
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}
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ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
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rtas_size);
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if (ret < 0) {
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fprintf(stderr, "Couldn't add rtas-size property: %s\n",
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fdt_strerror(ret));
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return ret;
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}
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for (i = 0; i < TOKEN_MAX; i++) {
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struct rtas_call *call = &rtas_table[i];
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if (!call->fn) {
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continue;
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}
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ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
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i + TOKEN_BASE);
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if (ret < 0) {
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fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
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call->name, fdt_strerror(ret));
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return ret;
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}
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}
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return 0;
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}
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