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a7e53dd32f
The 'uart=' parameter for the hypervisor takes multiple forms. One is to specify the BDF (Bus, Device, Function) value of the serial port PCI device. The description in the documentation used the previous format (e.g. '0:18.1') but a 16-bit WORD in HEX needs to be passed nowadays. E.g.: '0:18.1' is specified by 'uart=0xc1' Tracked-On: #5842 Signed-off-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com> Signed-off-by: Benjamin Fitch <benjamin.fitch@intel.com>
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <types.h>
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#include <rtl.h>
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#include <pci.h>
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#include <uart16550.h>
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#include <dbg_cmd.h>
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#define MAX_PORT 0x10000 /* port 0 - 64K */
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#define DEFAULT_UART_PORT 0x3F8
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#define MAX_CMD_LEN 64
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static struct uart_cmd {
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const char *const str;
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int type;
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} cmd_list[] = {
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{ "uart=port@", PIO }, /* uart=port@0x3F8 */
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{ "uart=bdf@", PCI }, /* uart=bdf@0xc1 */
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{ "uart=mmio@", MMIO }, /* uart=mmio@0xfe040000 */
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{ "uart=disabled", INVALID }
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};
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bool handle_dbg_cmd(const char *cmd, int32_t len)
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{
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uint32_t i;
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uint64_t data;
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for (i = 0; i < ARRAY_SIZE(cmd_list); i++) {
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int32_t tmp = strnlen_s(cmd_list[i].str, MAX_CMD_LEN);
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int type = cmd_list[i].type;
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/* cmd prefix should be same with one in cmd_list */
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if (len < tmp)
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continue;
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if (strncmp(cmd_list[i].str, cmd, tmp) != 0)
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continue;
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if (type == INVALID) {
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/* set uart disabled*/
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uart16550_set_property(false, type, 0UL);
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} else if (type == PIO) {
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data = strtoul_hex(cmd + tmp);
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if (data > MAX_PORT) {
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data = DEFAULT_UART_PORT;
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}
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uart16550_set_property(true, type, data);
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} else {
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data = strtoul_hex(cmd + tmp);
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uart16550_set_property(true, type, data);
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}
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}
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return (i < ARRAY_SIZE(cmd_list));
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}
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