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arm: add dcc "uart" functionality

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This commit is contained in:
Brian Swetland
2008-09-07 02:08:41 -07:00
committed by Travis Geiselbrecht
parent 544bf4ecde
commit e1d0b57f77
3 changed files with 76 additions and 1 deletions
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41
arch/arm/dcc.S Normal file
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@@ -0,0 +1,41 @@
/*
* Copyright (c) 2008 Brian Swetland
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
.global dcc_putc
.global dcc_getc
#if defined(ARM_CPU_ARM1136)
dcc_getc:
mrc 14, 0, r0, c0, c1, 0
tst r0, #(1 << 30)
moveq r0, #-1
mrcne 14, 0, r0, c0, c5, 0
bx lr
dcc_putc:
mrc 14, 0, r15, c0, c1, 0
mcrcc 14, 0, r0, c0, c5, 0
movcc r0, #0
movcs r0, #-1
bx lr
#endif

33
arch/arm/include/arch/arm/dcc.h Normal file
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@@ -0,0 +1,33 @@
/*
* Copyright (c) 2008 Brian Swetland
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef __ARCH_ARM_DCC_H
#define __ARCH_ARM_DCC_H
/* returns < 0 if no data available */
int dcc_getc(void);
/* returns < 0 if output register was already full */
int dcc_putc(unsigned c);
#endif

3
arch/arm/rules.mk
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@@ -95,7 +95,8 @@ OBJS += \
$(LOCAL_DIR)/exceptions.o \
$(LOCAL_DIR)/faults.o \
$(LOCAL_DIR)/mmu.o \
$(LOCAL_DIR)/thread.o
$(LOCAL_DIR)/thread.o \
$(LOCAL_DIR)/dcc.o
# set the default toolchain to arm elf and set a #define
TOOLCHAIN_PREFIX ?= arm-elf-