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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@ -0,0 +1,22 @@
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CROSS_COMPILE = powerpc64le-linux-
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CC = $(CROSS_COMPILE)gcc
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LD = $(CROSS_COMPILE)ld
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OBJCOPY = $(CROSS_COMPILE)objcopy
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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
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ASFLAGS = $(CFLAGS)
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LDFLAGS = -T powerpc.lds
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all: hello_world.hex
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hello_world.elf: hello_world.o head.o
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$(LD) $(LDFLAGS) -o hello_world.elf hello_world.o head.o
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hello_world.bin: hello_world.elf
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$(OBJCOPY) -O binary hello_world.elf hello_world.bin
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hello_world.hex: hello_world.bin
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./bin2hex.py hello_world.bin > hello_world.hex
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clean:
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@rm -f *.o hello_world.elf hello_world.bin hello_world.hex
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@ -0,0 +1,17 @@
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#!/usr/bin/python3
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import sys
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import subprocess
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import struct
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with open(sys.argv[1], "rb") as f:
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while True:
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word = f.read(8)
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if len(word) == 8:
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print("%016x" % struct.unpack('Q', word));
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elif len(word) == 4:
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print("00000000%08x" % struct.unpack('I', word));
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elif len(word) == 0:
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exit(0);
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else:
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raise Exception("Bad length")
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@ -0,0 +1,95 @@
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/* Copyright 2013-2014 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define STACK_TOP 0x3000
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#define FIXUP_ENDIAN \
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tdi 0,0,0x48; /* Reverse endian of b . + 8 */ \
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b 191f; /* Skip trampoline if endian is good */ \
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.long 0xa600607d; /* mfmsr r11 */ \
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.long 0x01006b69; /* xori r11,r11,1 */ \
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.long 0x05009f42; /* bcl 20,31,$+4 */ \
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.long 0xa602487d; /* mflr r10 */ \
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.long 0x14004a39; /* addi r10,r10,20 */ \
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.long 0xa64b5a7d; /* mthsrr0 r10 */ \
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.long 0xa64b7b7d; /* mthsrr1 r11 */ \
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.long 0x2402004c; /* hrfid */ \
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191:
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/* Load an immediate 64-bit value into a register */
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#define LOAD_IMM64(r, e) \
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lis r,(e)@highest; \
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ori r,r,(e)@higher; \
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rldicr r,r, 32, 31; \
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oris r,r, (e)@h; \
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ori r,r, (e)@l;
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.section ".head","ax"
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. = 0
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.global _start
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_start:
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FIXUP_ENDIAN
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b boot_entry
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.global boot_entry
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boot_entry:
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/* setup stack */
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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