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

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Vladimir 'phcoder' Serbinenko 2010-02-16 22:41:29 +01:00
parent 1eb746f274
commit a1efcc79d3
2 changed files with 86 additions and 0 deletions
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5
include/grub/mips/yeeloong/serial.h
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@ -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

81
kern/mips/yeeloong/fwstart.S Normal file
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@ -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 "