@samitouri / QOSamiQemu
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1 /*
2 * TCO Watchdog Action Table (WDAT)
3 *
4 * Copyright Red Hat, Inc. 2026
5 * Author(s): Igor Mammedov <imammedo@redhat.com>
6 *
7 * SPDX-License-Identifier: GPL-2.0-or-later
8 */
9
10 #include "qemu/osdep.h"
11 #include "hw/acpi/wdat.h"
12 #include "hw/acpi/wdat-ich9.h"
13 #include "hw/southbridge/ich9.h"
14
15 #define TCO_REG(base, reg_offset, reg_width) { .space_id = AML_AS_SYSTEM_IO, \
16 .address = base + reg_offset, .bit_width = reg_width, \
17 .access_width = AML_WORD_ACC, };
18
19 /*
20 * "Hardware Watchdog Timers Design Specification"
21 * https://uefi.org/acpi 'Watchdog Action Table (WDAT)'
22 *
23 * ICH9 specific implementation.
24 */
25 void build_ich9_wdat(GArray *table_data, BIOSLinker *linker, const char *oem_id,
26 const char *oem_table_id, uint64_t tco_base)
27 {
28 AcpiTable table = { .sig = "WDAT", .rev = 1, .oem_id = oem_id,
29 .oem_table_id = oem_table_id };
30 struct AcpiGenericAddress tco_rld = TCO_REG(tco_base, 0x0, 16);
31 struct AcpiGenericAddress tco2_sts = TCO_REG(tco_base, 0x6, 16);
32 struct AcpiGenericAddress tco1_cnt = TCO_REG(tco_base, 0x8, 16);
33 struct AcpiGenericAddress tco_tmr = TCO_REG(tco_base, 0x12, 16);
34
35 acpi_table_begin(&table, table_data);
36 build_append_int_noprefix(table_data, 0x20, 4); /* Watchdog Header Length */
37 build_append_int_noprefix(table_data, 0xff, 2); /* PCI Segment */
38 build_append_int_noprefix(table_data, 0xff, 1); /* PCI Bus Number */
39 build_append_int_noprefix(table_data, 0xff, 1); /* PCI Device Number */
40 build_append_int_noprefix(table_data, 0xff, 1); /* PCI Function Number */
41 build_append_int_noprefix(table_data, 0, 3); /* Reserved */
42 /*
43 * limits/resolution are defined by ICH9 TCO spec
44 */
45 build_append_int_noprefix(table_data, 0x258, 4);/* Timer Period, ms */
46 build_append_int_noprefix(table_data, 0x3ff, 4);/* Maximum Count */
47 build_append_int_noprefix(table_data, 0x4, 4); /* Minimum Count */
48 /*
49 * WATCHDOG_ENABLED & WATCHDOG_STOPPED_IN_SLEEP_STATE
50 */
51 build_append_int_noprefix(table_data, 0x81, 1); /* Watchdog Flags */
52 build_append_int_noprefix(table_data, 0, 3); /* Reserved */
53 /*
54 * watchdog instruction entries
55 */
56 build_append_int_noprefix(table_data, 10 /* # of actions below */, 4);
57 /* Action table */
58 build_append_wdat_ins(table_data, WDAT_ACTION_RESET,
59 WDAT_INS_WRITE_VALUE,
60 tco_rld, 0x1, 0x1ff);
61 build_append_wdat_ins(table_data, WDAT_ACTION_QUERY_RUNNING_STATE,
62 WDAT_INS_READ_VALUE,
63 tco1_cnt, 0x0, 0x800);
64 build_append_wdat_ins(table_data, WDAT_ACTION_SET_RUNNING_STATE,
65 WDAT_INS_WRITE_VALUE | WDAT_INS_PRESERVE_REGISTER,
66 tco1_cnt, 0, 0x800);
67 build_append_wdat_ins(table_data, WDAT_ACTION_QUERY_STOPPED_STATE,
68 WDAT_INS_READ_VALUE,
69 tco1_cnt, 0x800, 0x800);
70 build_append_wdat_ins(table_data, WDAT_ACTION_SET_STOPPED_STATE,
71 WDAT_INS_WRITE_VALUE | WDAT_INS_PRESERVE_REGISTER,
72 tco1_cnt, 0x800, 0x800);
73 build_append_wdat_ins(table_data, WDAT_ACTION_SET_COUNTDOWN_PERIOD,
74 WDAT_INS_WRITE_COUNTDOWN,
75 tco_tmr, 0x0, 0x3FF);
76 build_append_wdat_ins(table_data, WDAT_ACTION_QUERY_COUNTDOWN_PERIOD,
77 WDAT_INS_READ_COUNTDOWN,
78 tco_tmr, 0x0, 0x3FF);
79 build_append_wdat_ins(table_data, WDAT_ACTION_QUERY_WATCHDOG_STATUS,
80 WDAT_INS_READ_VALUE,
81 tco2_sts, 0x2, 0x2);
82 build_append_wdat_ins(table_data, WDAT_ACTION_SET_WATCHDOG_STATUS,
83 WDAT_INS_WRITE_VALUE | WDAT_INS_PRESERVE_REGISTER,
84 tco2_sts, 0x2, 0x2);
85 build_append_wdat_ins(table_data, WDAT_ACTION_SET_WATCHDOG_STATUS,
86 WDAT_INS_WRITE_VALUE | WDAT_INS_PRESERVE_REGISTER,
87 tco2_sts, 0x4, 0x4);
88
89 acpi_table_end(linker, &table);
90 }