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hw/loongarch: Add acpi SPCR table support 

Serial port console redirection table can be used for default serial
port selection, like chosen stdout-path selection with FDT method.

With acpi SPCR table added, early debug console can be parsed from
SPCR table with simple kernel parameter earlycon rather than
earlycon=uart,mmio,0x1fe001e0

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20240907073037.243353-1-maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
This commit is contained in:
Bibo Mao 2024-09-07 15:30:37 +08:00 committed by Song Gao
parent d9bd1ccbf1
commit 45d1fe46e5
1 changed files with 40 additions and 0 deletions
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40
hw/loongarch/acpi-build.c
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@ -242,6 +242,44 @@ build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine)
acpi_table_end(linker, &table);
}
/*
* Serial Port Console Redirection Table (SPCR)
* https://learn.microsoft.com/en-us/windows-hardware/drivers/serports/serial-port-console-redirection-table
*/
static void
spcr_setup(GArray *table_data, BIOSLinker *linker, MachineState *machine)
{
LoongArchVirtMachineState *lvms;
AcpiSpcrData serial = {
.interface_type = 0, /* 16550 compatible */
.base_addr.id = AML_AS_SYSTEM_MEMORY,
.base_addr.width = 32,
.base_addr.offset = 0,
.base_addr.size = 1,
.base_addr.addr = VIRT_UART_BASE,
.interrupt_type = 0, /* Interrupt not supported */
.pc_interrupt = 0,
.interrupt = VIRT_UART_IRQ,
.baud_rate = 7, /* 115200 */
.parity = 0,
.stop_bits = 1,
.flow_control = 0,
.terminal_type = 3, /* ANSI */
.language = 0, /* Language */
.pci_device_id = 0xffff, /* not a PCI device*/
.pci_vendor_id = 0xffff, /* not a PCI device*/
.pci_bus = 0,
.pci_device = 0,
.pci_function = 0,
.pci_flags = 0,
.pci_segment = 0,
};
lvms = LOONGARCH_VIRT_MACHINE(machine);
build_spcr(table_data, linker, &serial, 2, lvms->oem_id,
lvms->oem_table_id);
}
typedef
struct AcpiBuildState {
/* Copy of table in RAM (for patching). */
@ -484,6 +522,8 @@ static void acpi_build(AcpiBuildTables *tables, MachineState *machine)
acpi_add_table(table_offsets, tables_blob);
build_srat(tables_blob, tables->linker, machine);
acpi_add_table(table_offsets, tables_blob);
spcr_setup(tables_blob, tables->linker, machine);
if (machine->numa_state->num_nodes) {
if (machine->numa_state->have_numa_distance) {