hw/spapr_rtas.c

   1 /*
   2  * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
   3  *
   4  * Hypercall based emulated RTAS
   5  *
   6  * Copyright (c) 2010-2011 David Gibson, IBM Corporation.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  *
  26  */
  27 #include "cpu.h"
  28 #include "sysemu.h"
  29 #include "qemu-char.h"
  30 #include "hw/qdev.h"
  31 #include "device_tree.h"
  32
  33 #include "hw/spapr.h"
  34 #include "hw/spapr_vio.h"
  35
  36 #include <libfdt.h>
  37
  38 #define TOKEN_BASE      0x2000
  39 #define TOKEN_MAX       0x100
  40
  41 static struct rtas_call {
  42     const char *name;
  43     spapr_rtas_fn fn;
  44 } rtas_table[TOKEN_MAX];
  45
  46 struct rtas_call *rtas_next = rtas_table;
  47
  48 target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
  49                              uint32_t token, uint32_t nargs, target_ulong args,
  50                              uint32_t nret, target_ulong rets)
  51 {
  52     if ((token >= TOKEN_BASE)
  53         && ((token - TOKEN_BASE) < TOKEN_MAX)) {
  54         struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
  55
  56         if (call->fn) {
  57             call->fn(spapr, token, nargs, args, nret, rets);
  58             return H_SUCCESS;
  59         }
  60     }
  61
  62     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
  63     rtas_st(rets, 0, -3);
  64     return H_PARAMETER;
  65 }
  66
  67 void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
  68 {
  69     assert(rtas_next < (rtas_table + TOKEN_MAX));
  70
  71     rtas_next->name = name;
  72     rtas_next->fn = fn;
  73
  74     rtas_next++;
  75 }
  76
  77 int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr,
  78                                  target_phys_addr_t rtas_size)
  79 {
  80     int ret;
  81     int i;
  82
  83     ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
  84     if (ret < 0) {
  85         fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
  86                 fdt_strerror(ret));
  87         return ret;
  88     }
  89
  90     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
  91                                     rtas_addr);
  92     if (ret < 0) {
  93         fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
  94                 fdt_strerror(ret));
  95         return ret;
  96     }
  97
  98     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
  99                                     rtas_addr);
 100     if (ret < 0) {
 101         fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
 102                 fdt_strerror(ret));
 103         return ret;
 104     }
 105
 106     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
 107                                     rtas_size);
 108     if (ret < 0) {
 109         fprintf(stderr, "Couldn't add rtas-size property: %s\n",
 110                 fdt_strerror(ret));
 111         return ret;
 112     }
 113
 114     for (i = 0; i < TOKEN_MAX; i++) {
 115         struct rtas_call *call = &rtas_table[i];
 116
 117         if (!call->fn) {
 118             continue;
 119         }
 120
 121         ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
 122                                         i + TOKEN_BASE);
 123         if (ret < 0) {
 124             fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
 125                     call->name, fdt_strerror(ret));
 126             return ret;
 127         }
 128
 129     }
 130     return 0;
 131 }