From: Benjamin Doron <benjamin.doro...@gmail.com>
Tested on QEMU, dumping the appropriate memory region in UEFI shell
shows the TianoCore log. `find_cb_subtable` is sourced from STM/SeaBIOS.
Signed-off-by: Benjamin Doron <benjamin.doro...@gmail.com>
---
UefiPayloadPkg/Include/Coreboot.h | 14 +
.../Library/CbSerialPortLib/CbSerialPortLib.c | 272 ++++++++++++++++++
.../CbSerialPortLib/CbSerialPortLib.inf | 27 ++
UefiPayloadPkg/UefiPayloadPkg.dsc | 5 +
UefiPayloadPkg/UefiPayloadPkg.fdf | 6 +-
5 files changed, 323 insertions(+), 1 deletion(-)
create mode 100644 UefiPayloadPkg/Library/CbSerialPortLib/CbSerialPortLib.c
create mode 100644 UefiPayloadPkg/Library/CbSerialPortLib/CbSerialPortLib.inf
diff --git a/UefiPayloadPkg/Include/Coreboot.h
b/UefiPayloadPkg/Include/Coreboot.h
index a3e1109fe8..f2f577a02e 100644
--- a/UefiPayloadPkg/Include/Coreboot.h
+++ b/UefiPayloadPkg/Include/Coreboot.h
@@ -199,7 +199,14 @@ struct cb_forward {
UINT64 forward;
};
+struct cb_cbmem_ref {
+ UINT32 tag;
+ UINT32 size;
+ UINT64 cbmem_addr;
+};
+
#define CB_TAG_FRAMEBUFFER 0x0012
+
struct cb_framebuffer {
UINT32 tag;
UINT32 size;
@@ -230,6 +237,13 @@ struct cb_vdat {
#define CB_TAG_TIMESTAMPS 0x0016
#define CB_TAG_CBMEM_CONSOLE 0x0017
#define CB_TAG_MRC_CACHE 0x0018
+
+struct cbmem_console {
+ UINT32 size;
+ UINT32 cursor;
+ UINT8 body[0];
+} __attribute__((packed));
+
struct cb_cbmem_tab {
UINT32 tag;
UINT32 size;
diff --git a/UefiPayloadPkg/Library/CbSerialPortLib/CbSerialPortLib.c
b/UefiPayloadPkg/Library/CbSerialPortLib/CbSerialPortLib.c
new file mode 100644
index 0000000000..7b26c08dd7
--- /dev/null
+++ b/UefiPayloadPkg/Library/CbSerialPortLib/CbSerialPortLib.c
@@ -0,0 +1,272 @@
+/** @file
+ CBMEM console SerialPortLib instance
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Coreboot.h>
+
+#include <Library/BaseLib.h>
+#include <Library/BlParseLib.h>
+#include <Library/SerialPortLib.h>
+
+//
+// We can't use DebugLib due to a constructor dependency cycle between DebugLib
+// and ourselves.
+//
+#define ASSERT(Expression) \
+ do { \
+ if (!(Expression)) { \
+ CpuDeadLoop (); \
+ } \
+ } while (FALSE)
+
+#define CBMC_CURSOR_MASK ((1 << 28) - 1)
+#define CBMC_OVERFLOW (1 << 31)
+
+STATIC struct cbmem_console *gCbConsole = NULL;
+STATIC UINT32 STM_cursor = 0;
+
+// Try to find the coreboot memory table in the given coreboot table.
+static void *
+find_cb_subtable(struct cb_header *cbh, UINT32 tag)
+{
+ char *tbl = (char *)cbh + sizeof(*cbh);
+ UINT32 count = cbh->table_entries;
+ int i;
+ for (i=0; i<count; i++) {
+ struct cb_memory *cbm = (void*)tbl;
+ tbl += cbm->size;
+ if (cbm->tag == tag)
+ return cbm;
+ }
+ return NULL;
+}
+
+/**
+ Initialize the serial device hardware.
+
+ If no initialization is required, then return RETURN_SUCCESS.
+ If the serial device was successfully initialized, then return
RETURN_SUCCESS.
+ If the serial device could not be initialized, then return
RETURN_DEVICE_ERROR.
+
+ @retval RETURN_SUCCESS The serial device was initialized.
+ @retval RETURN_DEVICE_ERROR The serial device could not be initialized.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortInitialize (
+ VOID
+ )
+{
+ /* `FindCbTag` doesn't work because we need direct access to the memory
addresses? */
+ struct cb_header *cbh = GetParameterBase();
+ if (!cbh) {
+ return RETURN_DEVICE_ERROR;
+ }
+
+ struct cb_cbmem_ref *cbref = find_cb_subtable(cbh, CB_TAG_CBMEM_CONSOLE);
+ if (!cbref) {
+ return RETURN_DEVICE_ERROR;
+ }
+
+ gCbConsole = (void *)(UINTN)cbref->cbmem_addr; // Support PEI and DXE
+ if (gCbConsole == NULL) {
+ return RETURN_DEVICE_ERROR;
+ }
+
+ // set the cursor such that the STM console will not overwrite the
+ // coreboot console output
+ STM_cursor = gCbConsole->cursor & CBMC_CURSOR_MASK;
+
+ return RETURN_SUCCESS;
+}
+
+/**
+ Write data from buffer to serial device.
+
+ Writes NumberOfBytes data bytes from Buffer to the serial device.
+ The number of bytes actually written to the serial device is returned.
+ If the return value is less than NumberOfBytes, then the write operation
failed.
+ If Buffer is NULL, then ASSERT().
+ If NumberOfBytes is zero, then return 0.
+
+ @param Buffer Pointer to the data buffer to be written.
+ @param NumberOfBytes Number of bytes to written to the serial device.
+
+ @retval 0 NumberOfBytes is 0.
+ @retval >0 The number of bytes written to the serial device.
+ If this value is less than NumberOfBytes, then the
write operation failed.
+
+**/
+UINTN
+EFIAPI
+SerialPortWrite (
+ IN UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+ )
+{
+ UINTN Sent;
+ UINT32 cursor;
+ UINT32 flags;
+
+ ASSERT (Buffer != NULL);
+
+ if (NumberOfBytes == 0) {
+ return 0;
+ }
+
+ if (!gCbConsole) {
+ return 0;
+ }
+
+ Sent = 0;
+ do {
+ cursor = gCbConsole->cursor & CBMC_CURSOR_MASK;
+ flags = gCbConsole->cursor & ~CBMC_CURSOR_MASK;
+
+ if (cursor >= gCbConsole->size) {
+ return 0; // Old coreboot version with legacy overflow mechanism.
+ }
+
+ gCbConsole->body[cursor++] = Buffer[Sent++];
+
+ if (cursor >= gCbConsole->size) {
+ cursor = STM_cursor;
+ flags |= CBMC_OVERFLOW;
+ }
+
+ gCbConsole->cursor = flags | cursor;
+ } while (Sent < NumberOfBytes);
+
+ return Sent;
+}
+
+/**
+ Read data from serial device and save the datas in buffer.
+
+ Reads NumberOfBytes data bytes from a serial device into the buffer
+ specified by Buffer. The number of bytes actually read is returned.
+ If Buffer is NULL, then ASSERT().
+ If NumberOfBytes is zero, then return 0.
+
+ @param Buffer Pointer to the data buffer to store the data read
from the serial device.
+ @param NumberOfBytes Number of bytes which will be read.
+
+ @retval 0 Read data failed, no data is to be read.
+ @retval >0 Actual number of bytes read from serial device.
+
+**/
+UINTN
+EFIAPI
+SerialPortRead (
+ OUT UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+)
+{
+ return 0;
+}
+
+/**
+ Polls a serial device to see if there is any data waiting to be read.
+
+ @retval TRUE Data is waiting to be read from the serial device.
+ @retval FALSE There is no data waiting to be read from the serial
device.
+
+**/
+BOOLEAN
+EFIAPI
+SerialPortPoll (
+ VOID
+ )
+{
+ return FALSE;
+}
+
+/**
+ Sets the control bits on a serial device.
+
+ @param Control Sets the bits of Control that are settable.
+
+ @retval RETURN_SUCCESS The new control bits were set on the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetControl (
+ IN UINT32 Control
+ )
+{
+ return RETURN_UNSUPPORTED;
+}
+
+/**
+ Retrieve the status of the control bits on a serial device.
+
+ @param Control A pointer to return the current control
signals from the serial device.
+
+ @retval RETURN_SUCCESS The control bits were read from the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortGetControl (
+ OUT UINT32 *Control
+ )
+{
+ return RETURN_UNSUPPORTED;
+}
+
+/**
+ Sets the baud rate, receive FIFO depth, transmit/receive time out, parity,
+ data bits, and stop bits on a serial device.
+
+ @param BaudRate The requested baud rate. A BaudRate value of 0
will use the
+ device's default interface speed.
+ On output, the value actually set.
+ @param ReceiveFifoDepth The requested depth of the FIFO on the receive
side of the
+ serial interface. A ReceiveFifoDepth value of 0
will use
+ the device's default FIFO depth.
+ On output, the value actually set.
+ @param Timeout The requested time out for a single character in
microseconds.
+ This timeout applies to both the transmit and
receive side of the
+ interface. A Timeout value of 0 will use the
device's default time
+ out value.
+ On output, the value actually set.
+ @param Parity The type of parity to use on this serial device. A
Parity value of
+ DefaultParity will use the device's default parity
value.
+ On output, the value actually set.
+ @param DataBits The number of data bits to use on the serial
device. A DataBits
+ value of 0 will use the device's default data bit
setting.
+ On output, the value actually set.
+ @param StopBits The number of stop bits to use on this serial
device. A StopBits
+ value of DefaultStopBits will use the device's
default number of
+ stop bits.
+ On output, the value actually set.
+
+ @retval RETURN_SUCCESS The new attributes were set on the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_INVALID_PARAMETER One or more of the attributes has an
unsupported value.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning
correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetAttributes (
+ IN OUT UINT64 *BaudRate,
+ IN OUT UINT32 *ReceiveFifoDepth,
+ IN OUT UINT32 *Timeout,
+ IN OUT EFI_PARITY_TYPE *Parity,
+ IN OUT UINT8 *DataBits,
+ IN OUT EFI_STOP_BITS_TYPE *StopBits
+ )
+{
+ return RETURN_UNSUPPORTED;
+}
diff --git a/UefiPayloadPkg/Library/CbSerialPortLib/CbSerialPortLib.inf
b/UefiPayloadPkg/Library/CbSerialPortLib/CbSerialPortLib.inf
new file mode 100644
index 0000000000..37b33c24ad
--- /dev/null
+++ b/UefiPayloadPkg/Library/CbSerialPortLib/CbSerialPortLib.inf
@@ -0,0 +1,27 @@
+## @file
+# Component description file for CbSerialPortLib module.
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = CbSerialPortLib
+ FILE_GUID = 0DB3EF12-1426-4086-B012-113184C4CE11
+ MODULE_TYPE = BASE
+ VERSION_STRING = 0.5
+ LIBRARY_CLASS = SerialPortLib
+ CONSTRUCTOR = SerialPortInitialize
+
+[Sources]
+ CbSerialPortLib.c
+
+[Packages]
+ MdeModulePkg/MdeModulePkg.dec
+ MdePkg/MdePkg.dec
+ UefiPayloadPkg/UefiPayloadPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ BlParseLib
diff --git a/UefiPayloadPkg/UefiPayloadPkg.dsc
b/UefiPayloadPkg/UefiPayloadPkg.dsc
index 3d08edfe31..b3770b9be6 100644
--- a/UefiPayloadPkg/UefiPayloadPkg.dsc
+++ b/UefiPayloadPkg/UefiPayloadPkg.dsc
@@ -33,6 +33,7 @@
DEFINE UNIVERSAL_PAYLOAD = FALSE
DEFINE SECURITY_STUB_ENABLE = TRUE
DEFINE SMM_SUPPORT = FALSE
+ DEFINE USE_CBMEM_FOR_CONSOLE = FALSE
#
# SBL: UEFI payload for Slim Bootloader
# COREBOOT: UEFI payload for coreboot
@@ -223,7 +224,11 @@
TimerLib|UefiPayloadPkg/Library/AcpiTimerLib/AcpiTimerLib.inf
!endif
ResetSystemLib|UefiPayloadPkg/Library/ResetSystemLib/ResetSystemLib.inf
+!if $(USE_CBMEM_FOR_CONSOLE) == TRUE
+ SerialPortLib|UefiPayloadPkg/Library/CbSerialPortLib/CbSerialPortLib.inf
+!else
SerialPortLib|MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.inf
+!endif
PlatformHookLib|UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf
PlatformBootManagerLib|UefiPayloadPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
IoApicLib|PcAtChipsetPkg/Library/BaseIoApicLib/BaseIoApicLib.inf
diff --git a/UefiPayloadPkg/UefiPayloadPkg.fdf
b/UefiPayloadPkg/UefiPayloadPkg.fdf
index f619a23139..0df8342252 100644
--- a/UefiPayloadPkg/UefiPayloadPkg.fdf
+++ b/UefiPayloadPkg/UefiPayloadPkg.fdf
@@ -15,8 +15,12 @@ DEFINE FD_BLOCK_SIZE = 0x00001000
!if $(TARGET) == "NOOPT"
DEFINE FD_SIZE = 0x00850000
DEFINE NUM_BLOCKS = 0x850
-!else
+!elseif $(USE_CBMEM_FOR_CONSOLE) == TRUE
+DEFINE FD_SIZE = 0x00600000
+DEFINE NUM_BLOCKS = 0x600
+
+!else
DEFINE FD_SIZE = 0x00590000
DEFINE NUM_BLOCKS = 0x590
!endif
--
2.32.0
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