initial commit of lk (little kernel) project
diff --git a/platform/integrator/debug.c b/platform/integrator/debug.c
new file mode 100644
index 0000000..ab9f901
--- /dev/null
+++ b/platform/integrator/debug.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) 2008 Travis Geiselbrecht
+ *
+ * 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.
+ */
+#include <stdarg.h>
+#include <reg.h>
+#include <debug.h>
+#include <printf.h>
+#include <kernel/thread.h>
+#include <platform/debug.h>
+#include <arch/ops.h>
+#include <platform/integrator.h>
+
+static void write_uart_reg(int uart, int reg, unsigned char data)
+{
+ unsigned long base;
+ int mul = 4;
+
+ switch(uart) {
+ case 0: base = INTEGRATOR_UART0_REG_BASE; break;
+ case 1: base = INTEGRATOR_UART1_REG_BASE; break;
+ default: return;
+ }
+
+ *(volatile unsigned char *)(base + reg * mul) = data;
+}
+
+static unsigned char read_uart_reg(int uart, int reg)
+{
+ unsigned long base;
+ int mul = 4;
+
+ switch(uart) {
+ case 0: base = INTEGRATOR_UART0_REG_BASE; break;
+ case 1: base = INTEGRATOR_UART1_REG_BASE; break;
+ default: return 0;
+ }
+
+ return *(volatile unsigned char *)(base + reg * mul);
+}
+
+static int uart_init(void)
+{
+#if 0
+ /* clear the tx & rx fifo and disable */
+ write_uart_reg(0, UART_FCR, 0x6);
+#endif
+
+ return 0;
+}
+
+static int uart_putc(int port, char c )
+{
+ write_uart_reg(0, PL011_UARTDR, c);
+#if 0
+ while (!(read_uart_reg(port, UART_LSR) & (1<<6))) // wait for the shift register to empty
+ ;
+ write_uart_reg(port, UART_THR, c);
+#endif
+ return 0;
+}
+
+static int uart_getc(int port, bool wait) /* returns -1 if no data available */
+{
+#if 0
+ if (wait) {
+ while (!(read_uart_reg(port, UART_LSR) & (1<<0))) // wait for data to show up in the rx fifo
+ ;
+ } else {
+ if (!(read_uart_reg(port, UART_LSR) & (1<<0)))
+ return -1;
+ }
+ return read_uart_reg(port, UART_RHR);
+#endif
+ return -1;
+}
+
+void dputc(char c)
+{
+ uart_putc(0, c);
+}
+
+int dgetc(char *c)
+{
+ int result = uart_getc(0, false);
+
+ if (result < 0)
+ return -1;
+
+ *c = result;
+ return 0;
+}
+
+void debug_dump_regs(void)
+{
+ PANIC_UNIMPLEMENTED;
+}
+
+void debug_halt(void)
+{
+ dprintf("HALT: spinning forever...\n");
+ for(;;);
+}
+
+void debug_dump_memory_bytes(void *mem, int len)
+{
+ PANIC_UNIMPLEMENTED;
+}
+
+void debug_dump_memory_halfwords(void *mem, int len)
+{
+ PANIC_UNIMPLEMENTED;
+}
+
+void debug_dump_memory_words(void *mem, int len)
+{
+ PANIC_UNIMPLEMENTED;
+}
+
+void debug_set_trace_level(int trace_type, int level)
+{
+ PANIC_UNIMPLEMENTED;
+}
+
+uint32_t debug_cycle_count()
+{
+ PANIC_UNIMPLEMENTED;
+}