Merge tag 'efi-2019-04-rc4-2' of https://github.com/xypron2/u-boot

Pull request for UEFI system for v2019.04-rc4

Fix an error with the serial communication on boards with a very small
UART buffer which leads to a stalled system.

Provide an X86 reset driver for the UEFI runtime.

drivers/sysreset/sysreset_x86.c

@@ -10,8 +10,10 @@
 #include <sysreset.h>
 #include <asm/io.h>
 #include <asm/processor.h>
+#include <efi_loader.h>
 
-static int x86_sysreset_request(struct udevice *dev, enum sysreset_t type)
+static __efi_runtime int x86_sysreset_request(struct udevice *dev,
+					      enum sysreset_t type)
 {
 	int value;
 
@@ -31,6 +33,25 @@ static int x86_sysreset_request(struct udevice *dev, enum sysreset_t type)
 	return -EINPROGRESS;
 }
 
+#ifdef CONFIG_EFI_LOADER
+void __efi_runtime EFIAPI efi_reset_system(
+			enum efi_reset_type reset_type,
+			efi_status_t reset_status,
+			unsigned long data_size, void *reset_data)
+{
+	if (reset_type == EFI_RESET_COLD ||
+		 reset_type == EFI_RESET_PLATFORM_SPECIFIC)
+		x86_sysreset_request(NULL, SYSRESET_COLD);
+	else if (reset_type == EFI_RESET_WARM)
+		x86_sysreset_request(NULL, SYSRESET_WARM);
+
+	/* TODO EFI_RESET_SHUTDOWN */
+
+	while (1) { }
+}
+#endif
+
+
 static const struct udevice_id x86_sysreset_ids[] = {
 	{ .compatible = "x86,reset" },
 	{ }

lib/efi_loader/efi_console.c

@@ -62,6 +62,21 @@ static struct simple_text_output_mode efi_con_mode = {
 	.cursor_visible = 1,
 };
 
+static int term_get_char(s32 *c)
+{
+	u64 timeout;
+
+	/* Wait up to 100 ms for a character */
+	timeout = timer_get_us() + 100000;
+
+	while (!tstc())
+		if (timer_get_us() > timeout)
+			return 1;
+
+	*c = getc();
+	return 0;
+}
+
 /*
  * Receive and parse a reply from the terminal.
  *
@@ -72,19 +87,18 @@ static struct simple_text_output_mode efi_con_mode = {
  */
 static int term_read_reply(int *n, int num, char end_char)
 {
-	char c;
+	s32 c;
 	int i = 0;
 
-	c = getc();
-	if (c != cESC)
+	if (term_get_char(&c) || c != cESC)
 		return -1;
-	c = getc();
-	if (c != '[')
+
+	if (term_get_char(&c) || c != '[')
 		return -1;
 
 	n[0] = 0;
 	while (1) {
-		c = getc();
+		if (!term_get_char(&c)) {
 			if (c == ';') {
 				i++;
 				if (i >= num)
@@ -100,6 +114,9 @@ static int term_read_reply(int *n, int num, char end_char)
 			/* Read one more decimal position */
 			n[i] *= 10;
 			n[i] += c - '0';
+		} else {
+			return -1;
+		}
 	}
 	if (i != num - 1)
 		return -1;
@@ -196,7 +213,6 @@ static int query_console_serial(int *rows, int *cols)
 {
 	int ret = 0;
 	int n[2];
-	u64 timeout;
 
 	/* Empty input buffer */
 	while (tstc())
@@ -216,14 +232,6 @@ static int query_console_serial(int *rows, int *cols)
 	       ESC "[999;999H"	/* Move to bottom right corner */
 	       ESC "[6n");	/* Query cursor position */
 
-	/* Allow up to one second for a response */
-	timeout = timer_get_us() + 1000000;
-	while (!tstc())
-		if (timer_get_us() > timeout) {
-			ret = -1;
-			goto out;
-		}
-
 	/* Read {rows,cols} */
 	if (term_read_reply(n, 2, 'R')) {
 		ret = 1;