Yaya48
cf256aa081
Upstream: https://gitlab.com/qemu-project/qemu.git Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475
100 lines
3.9 KiB
C
100 lines
3.9 KiB
C
/*
|
||
* SBSA GWDT Watchdog Action Table (WDAT)
|
||
*
|
||
* Copyright Red Hat, Inc. 2026
|
||
* Author(s): Igor Mammedov <[email protected]>
|
||
*
|
||
* SPDX-License-Identifier: GPL-2.0-or-later
|
||
*/
|
||
|
||
#include "qemu/osdep.h"
|
||
#include "hw/acpi/aml-build.h"
|
||
#include "hw/acpi/wdat-gwdt.h"
|
||
#include "hw/acpi/wdat.h"
|
||
#include "hw/watchdog/sbsa_gwdt.h"
|
||
|
||
#define GWDT_REG(base, reg_offset, reg_width) { \
|
||
.space_id = AML_AS_SYSTEM_MEMORY, \
|
||
.address = base + reg_offset, .bit_width = reg_width, \
|
||
.access_width = AML_DWORD_ACC };
|
||
|
||
/*
|
||
* "Hardware Watchdog Timers Design Specification"
|
||
* https://uefi.org/acpi 'Watchdog Action Table (WDAT)'
|
||
*/
|
||
void build_gwdt_wdat(GArray *table_data, BIOSLinker *linker, const char *oem_id,
|
||
const char *oem_table_id, uint64_t rbase, uint64_t cbase,
|
||
uint64_t freq)
|
||
{
|
||
AcpiTable table = { .sig = "WDAT", .rev = 1, .oem_id = oem_id,
|
||
.oem_table_id = oem_table_id };
|
||
|
||
struct AcpiGenericAddress wrr = GWDT_REG(rbase, 0x0, 32);
|
||
struct AcpiGenericAddress wor_l = GWDT_REG(cbase, SBSA_GWDT_WOR, 32);
|
||
struct AcpiGenericAddress wcs = GWDT_REG(cbase, SBSA_GWDT_WCS, 32);
|
||
|
||
acpi_table_begin(&table, table_data);
|
||
build_append_int_noprefix(table_data, 0x20, 4); /* Watchdog Header Length */
|
||
/*
|
||
* PCI location fields are set to 0xff to indicate
|
||
* that the watchdog is not a PCI device.
|
||
*/
|
||
build_append_int_noprefix(table_data, 0xff, 2); /* PCI Segment */
|
||
build_append_int_noprefix(table_data, 0xff, 1); /* PCI Bus Number */
|
||
build_append_int_noprefix(table_data, 0xff, 1); /* PCI Device Number */
|
||
build_append_int_noprefix(table_data, 0xff, 1); /* PCI Function Number */
|
||
build_append_int_noprefix(table_data, 0, 3); /* Reserved */
|
||
/*
|
||
* WDAT spec: "The clock interval that the WDT uses must be
|
||
* greater than or equal to 1 millisecond."
|
||
*/
|
||
g_assert(freq <= 1000);
|
||
/* Timer Period, ms */
|
||
build_append_int_noprefix(table_data, 1000 / freq, 4);
|
||
/*
|
||
* WDAT spec: "The time-out period before the WDT fires is recommended
|
||
* to be at least 5 minutes."
|
||
* Set max count to 10min and min count to 5sec.
|
||
*/
|
||
build_append_int_noprefix(table_data, 600 * freq, 4); /* Maximum Count */
|
||
build_append_int_noprefix(table_data, 5 * freq, 4); /* Minimum Count */
|
||
/*
|
||
* WATCHDOG_ENABLED | WATCHDOG_STOPPED_IN_SLEEP_STATE
|
||
*/
|
||
build_append_int_noprefix(table_data, 0x81, 1); /* Watchdog Flags */
|
||
build_append_int_noprefix(table_data, 0, 3); /* Reserved */
|
||
/*
|
||
* watchdog instruction entries
|
||
*/
|
||
build_append_int_noprefix(table_data, 8, 4);
|
||
/* Action table: WCS (control/status) register actions */
|
||
build_append_wdat_ins(table_data, WDAT_ACTION_QUERY_RUNNING_STATE,
|
||
WDAT_INS_READ_VALUE,
|
||
wcs, 0x1, 0x1);
|
||
build_append_wdat_ins(table_data, WDAT_ACTION_SET_RUNNING_STATE,
|
||
WDAT_INS_WRITE_VALUE | WDAT_INS_PRESERVE_REGISTER,
|
||
wcs, 1, 0x00000001);
|
||
build_append_wdat_ins(table_data, WDAT_ACTION_QUERY_STOPPED_STATE,
|
||
WDAT_INS_READ_VALUE,
|
||
wcs, 0x0, 0x00000001);
|
||
build_append_wdat_ins(table_data, WDAT_ACTION_SET_STOPPED_STATE,
|
||
WDAT_INS_WRITE_VALUE | WDAT_INS_PRESERVE_REGISTER,
|
||
wcs, 0x0, 0x00000001);
|
||
build_append_wdat_ins(table_data, WDAT_ACTION_QUERY_WATCHDOG_STATUS,
|
||
WDAT_INS_READ_VALUE,
|
||
wcs, 0x4, 0x00000004);
|
||
/* WOR (offset) and WRR (refresh) register actions */
|
||
build_append_wdat_ins(table_data, WDAT_ACTION_SET_COUNTDOWN_PERIOD,
|
||
WDAT_INS_WRITE_COUNTDOWN,
|
||
wor_l, 0, 0xffffffff);
|
||
/* WRR: any write refreshes the watchdog, value is ignored */
|
||
build_append_wdat_ins(table_data, WDAT_ACTION_RESET,
|
||
WDAT_INS_WRITE_VALUE,
|
||
wrr, 0x1, 0x1);
|
||
build_append_wdat_ins(table_data, WDAT_ACTION_SET_WATCHDOG_STATUS,
|
||
WDAT_INS_WRITE_VALUE | WDAT_INS_PRESERVE_REGISTER,
|
||
wrr, 0x4, 0x4);
|
||
|
||
acpi_table_end(linker, &table);
|
||
}
|