hw/acpi/cpu_hotplug_acpi_table.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11
  12  * You should have received a copy of the GNU General Public License along
  13  * with this program; if not, see <http://www.gnu.org/licenses/>.
  14  */
  15
  16 #include "qemu/osdep.h"
  17 #include "hw/acpi/cpu_hotplug.h"
  18
  19 void build_cpu_hotplug_aml(Aml *ctx)
  20 {
  21     Aml *method;
  22     Aml *if_ctx;
  23     Aml *else_ctx;
  24     Aml *sb_scope = aml_scope("_SB");
  25     uint8_t madt_tmpl[8] = {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0};
  26     Aml *cpu_id = aml_arg(0);
  27     Aml *cpu_on = aml_local(0);
  28     Aml *madt = aml_local(1);
  29     Aml *cpus_map = aml_name(CPU_ON_BITMAP);
  30     Aml *zero = aml_int(0);
  31     Aml *one = aml_int(1);
  32
  33     /*
  34      * _MAT method - creates an madt apic buffer
  35      * cpu_id = Arg0 = Processor ID = Local APIC ID
  36      * cpu_on = Local0 = CPON flag for this cpu
  37      * madt = Local1 = Buffer (in madt apic form) to return
  38      */
  39     method = aml_method(CPU_MAT_METHOD, 1, AML_NOTSERIALIZED);
  40     aml_append(method,
  41         aml_store(aml_derefof(aml_index(cpus_map, cpu_id)), cpu_on));
  42     aml_append(method,
  43         aml_store(aml_buffer(sizeof(madt_tmpl), madt_tmpl), madt));
  44     /* Update the processor id, lapic id, and enable/disable status */
  45     aml_append(method, aml_store(cpu_id, aml_index(madt, aml_int(2))));
  46     aml_append(method, aml_store(cpu_id, aml_index(madt, aml_int(3))));
  47     aml_append(method, aml_store(cpu_on, aml_index(madt, aml_int(4))));
  48     aml_append(method, aml_return(madt));
  49     aml_append(sb_scope, method);
  50
  51     /*
  52      * _STA method - return ON status of cpu
  53      * cpu_id = Arg0 = Processor ID = Local APIC ID
  54      * cpu_on = Local0 = CPON flag for this cpu
  55      */
  56     method = aml_method(CPU_STATUS_METHOD, 1, AML_NOTSERIALIZED);
  57     aml_append(method,
  58         aml_store(aml_derefof(aml_index(cpus_map, cpu_id)), cpu_on));
  59     if_ctx = aml_if(cpu_on);
  60     {
  61         aml_append(if_ctx, aml_return(aml_int(0xF)));
  62     }
  63     aml_append(method, if_ctx);
  64     else_ctx = aml_else();
  65     {
  66         aml_append(else_ctx, aml_return(zero));
  67     }
  68     aml_append(method, else_ctx);
  69     aml_append(sb_scope, method);
  70
  71     method = aml_method(CPU_EJECT_METHOD, 2, AML_NOTSERIALIZED);
  72     aml_append(method, aml_sleep(200));
  73     aml_append(sb_scope, method);
  74
  75     method = aml_method(CPU_SCAN_METHOD, 0, AML_NOTSERIALIZED);
  76     {
  77         Aml *while_ctx, *if_ctx2, *else_ctx2;
  78         Aml *bus_check_evt = aml_int(1);
  79         Aml *remove_evt = aml_int(3);
  80         Aml *status_map = aml_local(5); /* Local5 = active cpu bitmap */
  81         Aml *byte = aml_local(2); /* Local2 = last read byte from bitmap */
  82         Aml *idx = aml_local(0); /* Processor ID / APIC ID iterator */
  83         Aml *is_cpu_on = aml_local(1); /* Local1 = CPON flag for cpu */
  84         Aml *status = aml_local(3); /* Local3 = active state for cpu */
  85
  86         aml_append(method, aml_store(aml_name(CPU_STATUS_MAP), status_map));
  87         aml_append(method, aml_store(zero, byte));
  88         aml_append(method, aml_store(zero, idx));
  89
  90         /* While (idx < SizeOf(CPON)) */
  91         while_ctx = aml_while(aml_lless(idx, aml_sizeof(cpus_map)));
  92         aml_append(while_ctx,
  93             aml_store(aml_derefof(aml_index(cpus_map, idx)), is_cpu_on));
  94
  95         if_ctx = aml_if(aml_and(idx, aml_int(0x07), NULL));
  96         {
  97             /* Shift down previously read bitmap byte */
  98             aml_append(if_ctx, aml_shiftright(byte, one, byte));
  99         }
 100         aml_append(while_ctx, if_ctx);
 101
 102         else_ctx = aml_else();
 103         {
 104             /* Read next byte from cpu bitmap */
 105             aml_append(else_ctx, aml_store(aml_derefof(aml_index(status_map,
 106                        aml_shiftright(idx, aml_int(3), NULL))), byte));
 107         }
 108         aml_append(while_ctx, else_ctx);
 109
 110         aml_append(while_ctx, aml_store(aml_and(byte, one, NULL), status));
 111         if_ctx = aml_if(aml_lnot(aml_equal(is_cpu_on, status)));
 112         {
 113             /* State change - update CPON with new state */
 114             aml_append(if_ctx, aml_store(status, aml_index(cpus_map, idx)));
 115             if_ctx2 = aml_if(aml_equal(status, one));
 116             {
 117                 aml_append(if_ctx2,
 118                     aml_call2(AML_NOTIFY_METHOD, idx, bus_check_evt));
 119             }
 120             aml_append(if_ctx, if_ctx2);
 121             else_ctx2 = aml_else();
 122             {
 123                 aml_append(else_ctx2,
 124                     aml_call2(AML_NOTIFY_METHOD, idx, remove_evt));
 125             }
 126         }
 127         aml_append(if_ctx, else_ctx2);
 128         aml_append(while_ctx, if_ctx);
 129
 130         aml_append(while_ctx, aml_increment(idx)); /* go to next cpu */
 131         aml_append(method, while_ctx);
 132     }
 133     aml_append(sb_scope, method);
 134
 135     aml_append(ctx, sb_scope);
 136 }