rust_lib_demo: Use common console code

Use a symlink to share the console code in hello_world. Not ideal,
but we can improve on it later.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>

rust_lib_demo/Makefile

@@ -1,9 +1,9 @@
 ARCH = $(shell uname -m)
 ifneq ("$(ARCH)", "ppc64")
 ifneq ("$(ARCH)", "ppc64le")
-        CROSS_COMPILE = powerpc64le-linux-gnu-
-        endif
-        endif
+	CROSS_COMPILE ?= powerpc64le-linux-
+endif
+endif
 
 CC = $(CROSS_COMPILE)gcc
 LD = $(CROSS_COMPILE)ld
@@ -30,14 +30,14 @@ size:
 dump:
 	powerpc64le-linux-gnu-objdump -S hello_world.elf | less
 
-hello_world.elf: hello_world.o head.o $(RUSTLIB)
-	$(LD) $(LDFLAGS) -o hello_world.elf hello_world.o head.o $(RUSTLIB)
+hello_world.elf: hello_world.o console.o head.o $(RUSTLIB)
+	$(LD) $(LDFLAGS) -o $@ $^
 
 hello_world.bin: hello_world.elf
-	$(OBJCOPY) -O binary hello_world.elf hello_world.bin
+	$(OBJCOPY) -O binary $^ $@
 
 hello_world.hex: hello_world.bin
-	./bin2hex.py hello_world.bin > hello_world.hex
+	../scripts/bin2hex.py $^ > $@
 
 clean:
 	cargo clean

rust_lib_demo/console.c

@@ -0,0 +1 @@
+../hello_world/console.c

rust_lib_demo/console.h

@@ -0,0 +1 @@
+../hello_world/console.h

rust_lib_demo/hello_world.c

@@ -1,135 +1,7 @@
-#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 50000000
-#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;
-}
+#include "console.h"
 
 void rust_main();
 
@@ -148,7 +20,6 @@ void init_bss()
 	}
 }
 
-
 #define HELLO_WORLD "Hello World\r\n"
 
 int main(void)