Add a simple hello_world example that also echos input
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>pull/4/head
Anton Blanchard
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01e6b8f583
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8bc3e8ea0a
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7c0802a63842a000
|
||||||
|
3fe2fffffbe1fff8
|
||||||
|
f80100103bff7190
|
||||||
|
4bfffec1f821ffd1
|
||||||
|
4bffffad7fe3fb78
|
||||||
|
7fe3fb787c641b78
|
||||||
|
4bfffee94bffff59
|
||||||
|
4bffff195463063e
|
||||||
|
000000004bfffff4
|
||||||
|
0000018001000000
|
||||||
|
6f57206f6c6c6548
|
||||||
|
0000000a0d646c72
|
||||||
|
0000000000000010
|
||||||
|
0141780400527a01
|
||||||
|
0000001000010c1b
|
||||||
|
fffffe5800000018
|
||||||
|
0000000000000040
|
||||||
|
0000002c00000010
|
||||||
|
00000038fffffe84
|
||||||
|
0000001000000000
|
||||||
|
fffffea800000040
|
||||||
|
0000000000000034
|
||||||
|
0000005400000028
|
||||||
|
00000050fffffec8
|
||||||
|
9f029e0041094500
|
||||||
|
437e4111300e4401
|
||||||
|
4106dedf41000e0a
|
||||||
|
000000100000000b
|
||||||
|
fffffeec00000080
|
||||||
|
000000000000002c
|
||||||
|
000000940000001c
|
||||||
|
00000054ffffff04
|
||||||
|
44019f0041094400
|
||||||
|
0000007e4111300e
|
||||||
@ -0,0 +1,22 @@
|
|||||||
|
CROSS_COMPILE = powerpc64le-linux-
|
||||||
|
CC = $(CROSS_COMPILE)gcc
|
||||||
|
LD = $(CROSS_COMPILE)ld
|
||||||
|
OBJCOPY = $(CROSS_COMPILE)objcopy
|
||||||
|
|
||||||
|
CFLAGS = -Os -g -Wall -std=c99 -msoft-float -mno-string -mno-multiple -mno-vsx -mno-altivec -mlittle-endian -fno-stack-protector -mstrict-align -ffreestanding -fdata-sections -ffunction-sections
|
||||||
|
ASFLAGS = $(CFLAGS)
|
||||||
|
LDFLAGS = -T powerpc.lds
|
||||||
|
|
||||||
|
all: hello_world.hex
|
||||||
|
|
||||||
|
hello_world.elf: hello_world.o head.o
|
||||||
|
$(LD) $(LDFLAGS) -o hello_world.elf hello_world.o head.o
|
||||||
|
|
||||||
|
hello_world.bin: hello_world.elf
|
||||||
|
$(OBJCOPY) -O binary hello_world.elf hello_world.bin
|
||||||
|
|
||||||
|
hello_world.hex: hello_world.bin
|
||||||
|
./bin2hex.py hello_world.bin > hello_world.hex
|
||||||
|
|
||||||
|
clean:
|
||||||
|
@rm -f *.o hello_world.elf hello_world.bin hello_world.hex
|
||||||
@ -0,0 +1,17 @@
|
|||||||
|
#!/usr/bin/python3
|
||||||
|
|
||||||
|
import sys
|
||||||
|
import subprocess
|
||||||
|
import struct
|
||||||
|
|
||||||
|
with open(sys.argv[1], "rb") as f:
|
||||||
|
while True:
|
||||||
|
word = f.read(8)
|
||||||
|
if len(word) == 8:
|
||||||
|
print("%016x" % struct.unpack('Q', word));
|
||||||
|
elif len(word) == 4:
|
||||||
|
print("00000000%08x" % struct.unpack('I', word));
|
||||||
|
elif len(word) == 0:
|
||||||
|
exit(0);
|
||||||
|
else:
|
||||||
|
raise Exception("Bad length")
|
||||||
@ -0,0 +1,95 @@
|
|||||||
|
/* Copyright 2013-2014 IBM Corp.
|
||||||
|
*
|
||||||
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||||
|
* you may not use this file except in compliance with the License.
|
||||||
|
* You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing, software
|
||||||
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||||
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
||||||
|
* implied.
|
||||||
|
* See the License for the specific language governing permissions and
|
||||||
|
* limitations under the License.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#define STACK_TOP 0x3000
|
||||||
|
|
||||||
|
#define FIXUP_ENDIAN \
|
||||||
|
tdi 0,0,0x48; /* Reverse endian of b . + 8 */ \
|
||||||
|
b 191f; /* Skip trampoline if endian is good */ \
|
||||||
|
.long 0xa600607d; /* mfmsr r11 */ \
|
||||||
|
.long 0x01006b69; /* xori r11,r11,1 */ \
|
||||||
|
.long 0x05009f42; /* bcl 20,31,$+4 */ \
|
||||||
|
.long 0xa602487d; /* mflr r10 */ \
|
||||||
|
.long 0x14004a39; /* addi r10,r10,20 */ \
|
||||||
|
.long 0xa64b5a7d; /* mthsrr0 r10 */ \
|
||||||
|
.long 0xa64b7b7d; /* mthsrr1 r11 */ \
|
||||||
|
.long 0x2402004c; /* hrfid */ \
|
||||||
|
191:
|
||||||
|
|
||||||
|
|
||||||
|
/* Load an immediate 64-bit value into a register */
|
||||||
|
#define LOAD_IMM64(r, e) \
|
||||||
|
lis r,(e)@highest; \
|
||||||
|
ori r,r,(e)@higher; \
|
||||||
|
rldicr r,r, 32, 31; \
|
||||||
|
oris r,r, (e)@h; \
|
||||||
|
ori r,r, (e)@l;
|
||||||
|
|
||||||
|
.section ".head","ax"
|
||||||
|
|
||||||
|
. = 0
|
||||||
|
.global _start
|
||||||
|
_start:
|
||||||
|
FIXUP_ENDIAN
|
||||||
|
b boot_entry
|
||||||
|
|
||||||
|
.global boot_entry
|
||||||
|
boot_entry:
|
||||||
|
/* setup stack */
|
||||||
|
LOAD_IMM64(%r1, STACK_TOP - 0x100)
|
||||||
|
LOAD_IMM64(%r12, main)
|
||||||
|
mtctr %r12,
|
||||||
|
bctrl
|
||||||
|
b .
|
||||||
|
|
||||||
|
#define EXCEPTION(nr) \
|
||||||
|
.= nr ;\
|
||||||
|
b .
|
||||||
|
|
||||||
|
/* More exception stubs */
|
||||||
|
EXCEPTION(0x300)
|
||||||
|
EXCEPTION(0x380)
|
||||||
|
EXCEPTION(0x400)
|
||||||
|
EXCEPTION(0x480)
|
||||||
|
EXCEPTION(0x500)
|
||||||
|
EXCEPTION(0x600)
|
||||||
|
EXCEPTION(0x700)
|
||||||
|
EXCEPTION(0x800)
|
||||||
|
EXCEPTION(0x900)
|
||||||
|
EXCEPTION(0x980)
|
||||||
|
EXCEPTION(0xa00)
|
||||||
|
EXCEPTION(0xb00)
|
||||||
|
EXCEPTION(0xc00)
|
||||||
|
EXCEPTION(0xd00)
|
||||||
|
EXCEPTION(0xe00)
|
||||||
|
EXCEPTION(0xe20)
|
||||||
|
EXCEPTION(0xe40)
|
||||||
|
EXCEPTION(0xe60)
|
||||||
|
EXCEPTION(0xe80)
|
||||||
|
EXCEPTION(0xf00)
|
||||||
|
EXCEPTION(0xf20)
|
||||||
|
EXCEPTION(0xf40)
|
||||||
|
EXCEPTION(0xf60)
|
||||||
|
EXCEPTION(0xf80)
|
||||||
|
#if 0
|
||||||
|
EXCEPTION(0x1000)
|
||||||
|
EXCEPTION(0x1100)
|
||||||
|
EXCEPTION(0x1200)
|
||||||
|
EXCEPTION(0x1300)
|
||||||
|
EXCEPTION(0x1400)
|
||||||
|
EXCEPTION(0x1500)
|
||||||
|
EXCEPTION(0x1600)
|
||||||
|
#endif
|
||||||
@ -0,0 +1,146 @@
|
|||||||
|
#include <unistd.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <stdint.h>
|
||||||
|
#include <stdbool.h>
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Core UART functions to implement for a port
|
||||||
|
*/
|
||||||
|
|
||||||
|
static uint64_t potato_uart_base;
|
||||||
|
|
||||||
|
#define PROC_FREQ 100000000
|
||||||
|
#define UART_FREQ 115200
|
||||||
|
#define UART_BASE 0xc0002000
|
||||||
|
|
||||||
|
#define POTATO_CONSOLE_TX 0x00
|
||||||
|
#define POTATO_CONSOLE_RX 0x08
|
||||||
|
#define POTATO_CONSOLE_STATUS 0x10
|
||||||
|
#define POTATO_CONSOLE_STATUS_RX_EMPTY 0x01
|
||||||
|
#define POTATO_CONSOLE_STATUS_TX_EMPTY 0x02
|
||||||
|
#define POTATO_CONSOLE_STATUS_RX_FULL 0x04
|
||||||
|
#define POTATO_CONSOLE_STATUS_TX_FULL 0x08
|
||||||
|
#define POTATO_CONSOLE_CLOCK_DIV 0x18
|
||||||
|
#define POTATO_CONSOLE_IRQ_EN 0x20
|
||||||
|
|
||||||
|
static uint64_t potato_uart_reg_read(int offset)
|
||||||
|
{
|
||||||
|
uint64_t addr;
|
||||||
|
uint64_t val;
|
||||||
|
|
||||||
|
addr = potato_uart_base + offset;
|
||||||
|
|
||||||
|
val = *(volatile uint64_t *)addr;
|
||||||
|
|
||||||
|
return val;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void potato_uart_reg_write(int offset, uint64_t val)
|
||||||
|
{
|
||||||
|
uint64_t addr;
|
||||||
|
|
||||||
|
addr = potato_uart_base + offset;
|
||||||
|
|
||||||
|
*(volatile uint64_t *)addr = val;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int potato_uart_rx_empty(void)
|
||||||
|
{
|
||||||
|
uint64_t val;
|
||||||
|
|
||||||
|
val = potato_uart_reg_read(POTATO_CONSOLE_STATUS);
|
||||||
|
|
||||||
|
if (val & POTATO_CONSOLE_STATUS_RX_EMPTY)
|
||||||
|
return 1;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int potato_uart_tx_full(void)
|
||||||
|
{
|
||||||
|
uint64_t val;
|
||||||
|
|
||||||
|
val = potato_uart_reg_read(POTATO_CONSOLE_STATUS);
|
||||||
|
|
||||||
|
if (val & POTATO_CONSOLE_STATUS_TX_FULL)
|
||||||
|
return 1;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static char potato_uart_read(void)
|
||||||
|
{
|
||||||
|
uint64_t val;
|
||||||
|
|
||||||
|
val = potato_uart_reg_read(POTATO_CONSOLE_RX);
|
||||||
|
|
||||||
|
return (char)(val & 0x000000ff);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void potato_uart_write(char c)
|
||||||
|
{
|
||||||
|
uint64_t val;
|
||||||
|
|
||||||
|
val = c;
|
||||||
|
|
||||||
|
potato_uart_reg_write(POTATO_CONSOLE_TX, val);
|
||||||
|
}
|
||||||
|
|
||||||
|
static unsigned long potato_uart_divisor(unsigned long proc_freq, unsigned long uart_freq)
|
||||||
|
{
|
||||||
|
return proc_freq / (uart_freq * 16) - 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
void potato_uart_init(void)
|
||||||
|
{
|
||||||
|
potato_uart_base = UART_BASE;
|
||||||
|
|
||||||
|
potato_uart_reg_write(POTATO_CONSOLE_CLOCK_DIV, potato_uart_divisor(PROC_FREQ, UART_FREQ));
|
||||||
|
}
|
||||||
|
|
||||||
|
int getchar(void)
|
||||||
|
{
|
||||||
|
while (potato_uart_rx_empty())
|
||||||
|
/* Do nothing */ ;
|
||||||
|
|
||||||
|
return potato_uart_read();
|
||||||
|
}
|
||||||
|
|
||||||
|
void putchar(unsigned char c)
|
||||||
|
{
|
||||||
|
while (potato_uart_tx_full())
|
||||||
|
/* Do Nothing */;
|
||||||
|
|
||||||
|
potato_uart_write(c);
|
||||||
|
}
|
||||||
|
|
||||||
|
void putstr(const char *str, unsigned long len)
|
||||||
|
{
|
||||||
|
for (unsigned long i = 0; i < len; i++) {
|
||||||
|
putchar(str[i]);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
size_t strlen(const char *s)
|
||||||
|
{
|
||||||
|
size_t len = 0;
|
||||||
|
|
||||||
|
while (*s++)
|
||||||
|
len++;
|
||||||
|
|
||||||
|
return len;
|
||||||
|
}
|
||||||
|
|
||||||
|
#define HELLO_WORLD "Hello World\r\n"
|
||||||
|
|
||||||
|
int main(void)
|
||||||
|
{
|
||||||
|
potato_uart_init();
|
||||||
|
|
||||||
|
putstr(HELLO_WORLD, strlen(HELLO_WORLD));
|
||||||
|
|
||||||
|
while (1) {
|
||||||
|
unsigned char c = getchar();
|
||||||
|
putchar(c);
|
||||||
|
}
|
||||||
|
}
|
||||||
@ -0,0 +1,13 @@
|
|||||||
|
SECTIONS
|
||||||
|
{
|
||||||
|
_start = .;
|
||||||
|
. = 0;
|
||||||
|
.head : {
|
||||||
|
KEEP(*(.head))
|
||||||
|
}
|
||||||
|
. = 0x1000;
|
||||||
|
.text : { *(.text) }
|
||||||
|
. = 0x2000;
|
||||||
|
.data : { *(.data) }
|
||||||
|
.bss : { *(.bss) }
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue