HV: add API to change vuart base & irq config

1. add an API to support vuart COM base and irq configured;
2. add the HV cmd to be parsed for vuart COM base & irq.

Tracked-On: #2170
Signed-off-by: Minggui Cao <minggui.cao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: mgcao

hypervisor/bsp/uefi/cmdline.c

@@ -18,12 +18,19 @@ static const char * const cmd_list[] = {
 	"uart=disabled",	/* to disable uart */
 	"uart=port@",		/* like uart=port@0x3F8 */
 	"uart=bdf@",	/*like: uart=bdf@0:18.2, it is for ttyS2 */
+
+	/* format: vuart=ttySx@irqN, like vuart=ttyS1@irq6; better to unify
+	 * uart & vuart & SOS console the same one, and irq same with the native.
+	 * ttySx range (0-3), irqN (0-255)
+	 */
+	"vuart=ttyS",
 };
 
 enum IDX_CMD {
 	IDX_DISABLE_UART,
 	IDX_PORT_UART,
 	IDX_PCI_UART,
+	IDX_SET_VUART,
 
 	IDX_MAX_CMD,
 };
@@ -55,6 +62,8 @@ static void handle_cmd(const char *cmd, int32_t len)
 
 		} else if (i == IDX_PCI_UART) {
 			uart16550_set_property(true, false, (uint64_t)(cmd+tmp));
+		} else if (i == IDX_SET_VUART) {
+			vuart_set_property(cmd+tmp);
 		}
 	}
 }

hypervisor/debug/vuart.c

@@ -411,3 +411,19 @@ bool hv_used_dbg_intx(uint8_t intx_pin)
 {
 	return is_dbg_uart_enabled() && (intx_pin == vuart_com_irq);
 }
+
+/* vuart=ttySx@irqN, like vuart=ttyS1@irq6 head "vuart=ttyS" is parsed */
+void vuart_set_property(const char *vuart_info)
+{
+	const uint16_t com_map[4] = {0x3f8, 0x2F8, 0x3E8, 0x2E8}; /* map to ttyS0-ttyS3 */
+	uint8_t com_idx;
+
+	com_idx = (uint8_t)(vuart_info[0] - '0');
+	if (com_idx < 4) {
+		vuart_com_base = com_map[com_idx];
+	}
+
+	if (strncmp(vuart_info + 1, "@irq", 4) == 0) {
+		vuart_com_irq = (uint8_t)strtol_deci(vuart_info + 5);
+	}
+}

hypervisor/include/debug/vuart.h

@@ -76,4 +76,5 @@ void vuart_console_tx_chars(struct acrn_vuart *vu);
 void vuart_console_rx_chars(struct acrn_vuart *vu);
 
 bool hv_used_dbg_intx(uint8_t intx_pin);
+void vuart_set_property(const char *vuart_info);
 #endif /* VUART_H */

hypervisor/release/vuart.c

@@ -20,3 +20,5 @@ bool hv_used_dbg_intx(__unused uint8_t intx_pin)
 {
 	return false;
 }
+
+void vuart_set_property(__unused const char *vuart_info) {}