102 lines
2.0 KiB
C
102 lines
2.0 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 <hypervisor.h>
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#include <multiboot.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 ACRN_DBG_PARSE 6
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#define MAX_CMD_LEN 64
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static const char * const cmd_list[] = {
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"uart=disabled", /* to disable uart */
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"uart=port@", /* like uart=port@0x3F8 */
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"uart=mmio@", /*like: uart=mmio@0xFC000000 */
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};
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enum IDX_CMD {
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IDX_DISABLE_UART,
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IDX_PORT_UART,
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IDX_MMIO_UART,
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IDX_MAX_CMD,
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};
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static void handle_cmd(const char *cmd, int len)
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{
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int i;
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for (i = 0; i < IDX_MAX_CMD; i++) {
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int tmp = strnlen_s(cmd_list[i], MAX_CMD_LEN);
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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], cmd, tmp) != 0)
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continue;
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if (i == IDX_DISABLE_UART) {
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/* set uart disabled*/
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uart16550_set_property(0, 0, 0);
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} else if ((i == IDX_PORT_UART) || (i == IDX_MMIO_UART)) {
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uint64_t addr = strtoul(cmd + tmp, NULL, 16);
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dev_dbg(ACRN_DBG_PARSE, "uart addr=0x%llx", addr);
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if (i == IDX_PORT_UART) {
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if (addr > MAX_PORT)
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addr = DEFAULT_UART_PORT;
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uart16550_set_property(1, 1, addr);
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} else {
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uart16550_set_property(1, 0, addr);
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}
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}
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}
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}
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int parse_hv_cmdline(void)
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{
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const char *start;
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const char *end;
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struct multiboot_info *mbi = NULL;
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if (boot_regs[0] != MULTIBOOT_INFO_MAGIC) {
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ASSERT(0, "no multiboot info found");
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return -EINVAL;
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}
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mbi = (struct multiboot_info *)(HPA2HVA((uint64_t)boot_regs[1]));
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dev_dbg(ACRN_DBG_PARSE, "Multiboot detected, flag=0x%x", mbi->mi_flags);
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if (!(mbi->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE)) {
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dev_dbg(ACRN_DBG_PARSE, "no hv cmdline!");
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return -EINVAL;
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}
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start = (char *)HPA2HVA((uint64_t)mbi->mi_cmdline);
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dev_dbg(ACRN_DBG_PARSE, "hv cmdline: %s", start);
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do {
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while (*start == ' ')
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start++;
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end = start + 1;
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while (*end != ' ' && *end)
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end++;
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handle_cmd(start, end - start);
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start = end + 1;
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} while (*end && *start);
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return 0;
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}
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