libpayload: Cache physical location of serial-console struct

In the presence of self-relocating payloads, it's safer to keep
physical addresses in `libsysinfo`.

Change-Id: Icd30e95c6b8115d16dd793914fb01a1a9da1854f
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43577
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>

payloads/libpayload/drivers/serial/8250.c

@@ -132,9 +132,9 @@ void serial_init(void)
 
 void serial_console_init(void)
 {
-	if (!lib_sysinfo.serial)
+	if (!lib_sysinfo.cb_serial)
 		return;
-	cb_serial = *lib_sysinfo.serial;
+	cb_serial = *(struct cb_serial *)phys_to_virt(lib_sysinfo.cb_serial);
 
 	serial_init();
 

payloads/libpayload/drivers/serial/ipq40xx.c

@@ -553,9 +553,7 @@ static struct console_output_driver consout = {};
 /* For simplicity's sake, let's rely on coreboot initializing the UART. */
 void serial_console_init(void)
 {
-	struct cb_serial *sc_ptr = lib_sysinfo.serial;
+	if (!lib_sysinfo.cb_serial)
-
-	if (!sc_ptr)
 		return;
 
 	consin.havekey = serial_havechar;

payloads/libpayload/drivers/serial/ipq806x.c

@@ -343,9 +343,9 @@ int serial_getchar(void)
 /* For simplicity's sake, let's rely on coreboot initializing the UART. */
 void serial_console_init(void)
 {
-	struct cb_serial *sc_ptr = lib_sysinfo.serial;
+	struct cb_serial *sc_ptr = phys_to_virt(lib_sysinfo.cb_serial);
 
-	if (!sc_ptr)
+	if (!lib_sysinfo.cb_serial)
 		return;
 
 	base_uart_addr = (void *) sc_ptr->baseaddr;

payloads/libpayload/drivers/serial/qcom_qupv3_serial.c

@@ -275,7 +275,8 @@ static struct console_output_driver consout = {
 
 static struct qup_regs *uart_base_address(void)
 {
-	return (void *)(uintptr_t)lib_sysinfo.serial->baseaddr;
+	const struct cb_serial *const serial = phys_to_virt(lib_sysinfo.cb_serial);
+	return phys_to_virt(serial->baseaddr);
 }
 
 static void uart_qupv3_tx_flush(void)
@@ -332,7 +333,7 @@ int serial_getchar(void)
 
 void serial_console_init(void)
 {
-	if (!lib_sysinfo.serial)
+	if (!lib_sysinfo.cb_serial)
 		return;
 
 	console_add_output_driver(&consout);

payloads/libpayload/drivers/serial/qcs405.c

@@ -541,9 +541,9 @@ int serial_getchar(void)
 /* For simplicity's sake, let's rely on coreboot initializing the UART. */
 void serial_console_init(void)
 {
-	struct cb_serial *sc_ptr = lib_sysinfo.serial;
+	struct cb_serial *sc_ptr = phys_to_virt(lib_sysinfo.cb_serial);
 
-	if (!sc_ptr)
+	if (!lib_sysinfo.cb_serial)
 		return;
 
 	uart_board_param.uart_dm_base = (void *)(uintptr_t)sc_ptr->baseaddr;

payloads/libpayload/drivers/serial/s5p.c

@@ -90,10 +90,12 @@ static struct console_input_driver s5p_serial_input =
 
 void serial_init(void)
 {
-	if (!lib_sysinfo.serial || !lib_sysinfo.serial->baseaddr)
+	const struct cb_serial *const serial = phys_to_virt(lib_sysinfo.cb_serial);
+
+	if (!lib_sysinfo.cb_serial || !serial->baseaddr)
 		return;
 
-	uart_regs = (struct s5p_uart *)lib_sysinfo.serial->baseaddr;
+	uart_regs = (struct s5p_uart *)serial->baseaddr;
 }
 
 void serial_console_init(void)

payloads/libpayload/include/sysinfo.h

@@ -41,8 +41,6 @@
 
 #include <coreboot_tables.h>
 
-struct cb_serial;
-
 /*
  * All pointers in here shall be virtual.
  *
@@ -51,7 +49,7 @@ struct cb_serial;
  */
 struct sysinfo_t {
 	unsigned int cpu_khz;
-	struct cb_serial *serial;
+	uintptr_t cb_serial;
 	unsigned short ser_ioport;
 	unsigned long ser_base; // for mmapped serial
 

payloads/libpayload/libc/coreboot.c

@@ -86,7 +86,7 @@ static void cb_parse_memory(void *ptr, struct sysinfo_t *info)
 
 static void cb_parse_serial(void *ptr, struct sysinfo_t *info)
 {
-	info->serial = ((struct cb_serial *)ptr);
+	info->cb_serial = virt_to_phys(ptr);
 }
 
 static void cb_parse_vboot_workbuf(unsigned char *ptr, struct sysinfo_t *info)