Firmware startup block (for now just output a string on console)

diff --git a/include/grub/mips/yeeloong/serial.h b/include/grub/mips/yeeloong/serial.h
index 9390ea18abb4ffa409fbd9d9ec1027ba53fdbcc7..bced102b6b7392df6ad0653d1f228c8d3a8205d2 100644 (file)
--- a/include/grub/mips/yeeloong/serial.h
+++ b/include/grub/mips/yeeloong/serial.h
@@ -19,6 +19,11 @@
 #ifndef GRUB_MACHINE_SERIAL_HEADER
 #define GRUB_MACHINE_SERIAL_HEADER     1
 
+#ifndef ASM_FILE
 #define GRUB_MACHINE_SERIAL_PORTS { 0xbff003f8 }
+#else
+#define GRUB_MACHINE_SERIAL_PORT_HI  0xbff0
+#define GRUB_MACHINE_SERIAL_PORT_LO  0x03f8 
+#endif
 
 #endif 

diff --git a/kern/mips/yeeloong/fwstart.S b/kern/mips/yeeloong/fwstart.S
new file mode 100644 (file)
index 0000000..5132d75
--- /dev/null
+++ b/kern/mips/yeeloong/fwstart.S
@@ -0,0 +1,81 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2000,2001,2002,2003,2004,2005,2007,2008,2009,2010  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/mips/yeeloong/serial.h>
+#include <grub/serial.h>
+
+       .set noreorder
+       .set noat
+       .set nomacro
+
+       bal serial_hw_init
+        nop
+self:  
+       b self
+        nop
+
+       /* Same as similarly named C function but in asm since
+          we need it early.  */
+       /* In: none. Out: none. Clobbered: $t0, $t1, $a0.  */
+serial_hw_init:
+       lui $t0, GRUB_MACHINE_SERIAL_PORT_HI
+
+       /* Turn off the interrupt.  */
+       sb $zero, (GRUB_MACHINE_SERIAL_PORT_LO + UART_IER)($t0)
+
+       /* Set DLAB.  */
+       ori $t1, $zero, UART_DLAB
+       sb  $t1, (GRUB_MACHINE_SERIAL_PORT_LO + UART_LCR)($t0)
+
+       /* Set the baud rate 115200.  */
+       ori $t1, $zero, 2
+       sb $t1, (GRUB_MACHINE_SERIAL_PORT_LO + UART_DLL)($t0) 
+       sb $zero, (GRUB_MACHINE_SERIAL_PORT_LO + UART_DLH)($t0) 
+
+       /* Set the line status.  */
+       ori $t1, $zero, (UART_NO_PARITY | UART_8BITS_WORD | UART_1_STOP_BIT)
+        sb  $t1, (GRUB_MACHINE_SERIAL_PORT_LO + UART_LCR)($t0)
+
+       /* Enable the FIFO.  */
+       ori $t1, $zero, UART_ENABLE_FIFO_TRIGGER1
+       sb $t1, (GRUB_MACHINE_SERIAL_PORT_LO + UART_FCR)($t0)
+
+       /* Turn on DTR and RTS.  */
+       ori $t1, $zero, UART_ENABLE_DTRRTS
+       sb  $t1, (GRUB_MACHINE_SERIAL_PORT_LO + UART_MCR)($t0)
+
+       lui $t0, 0xbff0
+       addiu $t0, $t0, 0x03f8  
+
+       /* Let message return to original caller.  */
+       lui  $a0, %hi(notification_string)
+       addiu $a0, $a0, %lo(notification_string)
+
+       /* Print message on serial console.  */
+       /* In: $a0 = asciiz message. Out: none. Clobbered: $t0, $t1, $a0.  */
+message:
+       lui $t0, GRUB_MACHINE_SERIAL_PORT_HI
+1:     
+       lb  $t1, 0($a0)
+       addiu $a0, $a0, 1
+       bne $t1, $zero, 1b
+        sb  $t1, (GRUB_MACHINE_SERIAL_PORT_LO + UART_TX)($t0)
+       jr  $ra
+        nop
+
+notification_string:   .asciz "GRUB "