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 "hw/acpi/cpu_hotplug.h"
  17
  18 void build_cpu_hotplug_aml(Aml *ctx)
  19 {
  20     Aml *method;
  21     Aml *if_ctx;
  22     Aml *else_ctx;
  23     Aml *sb_scope = aml_scope("_SB");
  24     uint8_t madt_tmpl[8] = {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0};
  25     Aml *cpu_id = aml_arg(0);
  26     Aml *cpu_on = aml_local(0);
  27     Aml *madt = aml_local(1);
  28     Aml *cpus_map = aml_name(CPU_ON_BITMAP);
  29     Aml *zero = aml_int(0);
  30     Aml *one = aml_int(1);
  31
  32     /*
  33      * _MAT method - creates an madt apic buffer
  34      * cpu_id = Arg0 = Processor ID = Local APIC ID
  35      * cpu_on = Local0 = CPON flag for this cpu
  36      * madt = Local1 = Buffer (in madt apic form) to return
  37      */
  38     method = aml_method(CPU_MAT_METHOD, 1, AML_NOTSERIALIZED);
  39     aml_append(method,
  40         aml_store(aml_derefof(aml_index(cpus_map, cpu_id)), cpu_on));
  41     aml_append(method,
  42         aml_store(aml_buffer(sizeof(madt_tmpl), madt_tmpl), madt));
  43     /* Update the processor id, lapic id, and enable/disable status */
  44     aml_append(method, aml_store(cpu_id, aml_index(madt, aml_int(2))));
  45     aml_append(method, aml_store(cpu_id, aml_index(madt, aml_int(3))));
  46     aml_append(method, aml_store(cpu_on, aml_index(madt, aml_int(4))));
  47     aml_append(method, aml_return(madt));
  48     aml_append(sb_scope, method);
  49
  50     /*
  51      * _STA method - return ON status of cpu
  52      * cpu_id = Arg0 = Processor ID = Local APIC ID
  53      * cpu_on = Local0 = CPON flag for this cpu
  54      */
  55     method = aml_method(CPU_STATUS_METHOD, 1, AML_NOTSERIALIZED);
  56     aml_append(method,
  57         aml_store(aml_derefof(aml_index(cpus_map, cpu_id)), cpu_on));
  58     if_ctx = aml_if(cpu_on);
  59     {
  60         aml_append(if_ctx, aml_return(aml_int(0xF)));
  61     }
  62     aml_append(method, if_ctx);
  63     else_ctx = aml_else();
  64     {
  65         aml_append(else_ctx, aml_return(zero));
  66     }
  67     aml_append(method, else_ctx);
  68     aml_append(sb_scope, method);
  69
  70     method = aml_method(CPU_EJECT_METHOD, 2, AML_NOTSERIALIZED);
  71     aml_append(method, aml_sleep(200));
  72     aml_append(sb_scope, method);
  73
  74     method = aml_method(stringify(CPU_SCAN_METHOD), 0, AML_NOTSERIALIZED);
  75     {
  76         Aml *while_ctx, *if_ctx2, *else_ctx2;
  77         Aml *bus_check_evt = aml_int(1);
  78         Aml *remove_evt = aml_int(3);
  79         Aml *status_map = aml_local(5); /* Local5 = active cpu bitmap */
  80         Aml *byte = aml_local(2); /* Local2 = last read byte from bitmap */
  81         Aml *idx = aml_local(0); /* Processor ID / APIC ID iterator */
  82         Aml *is_cpu_on = aml_local(1); /* Local1 = CPON flag for cpu */
  83         Aml *status = aml_local(3); /* Local3 = active state for cpu */
  84
  85         aml_append(method, aml_store(aml_name(CPU_STATUS_MAP), status_map));
  86         aml_append(method, aml_store(zero, byte));
  87         aml_append(method, aml_store(zero, idx));
  88
  89         /* While (idx < SizeOf(CPON)) */
  90         while_ctx = aml_while(aml_lless(idx, aml_sizeof(cpus_map)));
  91         aml_append(while_ctx,
  92             aml_store(aml_derefof(aml_index(cpus_map, idx)), is_cpu_on));
  93
  94         if_ctx = aml_if(aml_and(idx, aml_int(0x07), NULL));
  95         {
  96             /* Shift down previously read bitmap byte */
  97             aml_append(if_ctx, aml_shiftright(byte, one, byte));
  98         }
  99         aml_append(while_ctx, if_ctx);
 100
 101         else_ctx = aml_else();
 102         {
 103             /* Read next byte from cpu bitmap */
 104             aml_append(else_ctx, aml_store(aml_derefof(aml_index(status_map,
 105                        aml_shiftright(idx, aml_int(3), NULL))), byte));
 106         }
 107         aml_append(while_ctx, else_ctx);
 108
 109         aml_append(while_ctx, aml_store(aml_and(byte, one, NULL), status));
 110         if_ctx = aml_if(aml_lnot(aml_equal(is_cpu_on, status)));
 111         {
 112             /* State change - update CPON with new state */
 113             aml_append(if_ctx, aml_store(status, aml_index(cpus_map, idx)));
 114             if_ctx2 = aml_if(aml_equal(status, one));
 115             {
 116                 aml_append(if_ctx2,
 117                     aml_call2(AML_NOTIFY_METHOD, idx, bus_check_evt));
 118             }
 119             aml_append(if_ctx, if_ctx2);
 120             else_ctx2 = aml_else();
 121             {
 122                 aml_append(else_ctx2,
 123                     aml_call2(AML_NOTIFY_METHOD, idx, remove_evt));
 124             }
 125         }
 126         aml_append(if_ctx, else_ctx2);
 127         aml_append(while_ctx, if_ctx);
 128
 129         aml_append(while_ctx, aml_increment(idx)); /* go to next cpu */
 130         aml_append(method, while_ctx);
 131     }
 132     aml_append(sb_scope, method);
 133
 134     aml_append(ctx, sb_scope);
 135 }