mbv: use new ninja-based build

mbv/bootloader/bootloader.cc

@@ -0,0 +1,81 @@
+#include <cstdint>
+
+#include "xuartlite.h"
+
+struct Gpio {
+    volatile uint32_t data;
+};
+
+#define gpio0 ((Gpio*)0x40000000)
+
+namespace {
+constexpr uintptr_t kUart0BaseAddress = 0x40600000;
+XUartLite uart0_inst;
+XUartLite_Config uart0_config = {
+    .DeviceId = 0,
+    .RegBaseAddr = kUart0BaseAddress,
+    .BaudRate = 115200,
+    .UseParity = false,
+    .DataBits = 8,
+};
+
+XUartLite* uart0 = &uart0_inst;
+
+void InitUarts() {
+    XUartLite_CfgInitialize(uart0, &uart0_config, uart0_config.RegBaseAddr);
+}
+
+uint8_t UartRead() {
+    uint8_t c;
+    while (XUartLite_Recv(uart0, &c, 1) < 1) {
+    }
+    return c;
+}
+
+void UartWrite(uint8_t c) { XUartLite_Send(uart0, &c, 1); }
+
+uint32_t UartRead32() {
+    uint32_t val = 0;
+
+    // little endian
+    val |= (UartRead() << 0);
+    val |= (UartRead() << 8);
+    val |= (UartRead() << 16);
+    val |= (UartRead() << 24);
+
+    return val;
+}
+}  // namespace
+
+int main() {
+    gpio0->data = 1;
+
+    InitUarts();
+
+    while (1) {
+        uint8_t c = UartRead();
+        if (c == 'c') {
+            uint32_t addr = UartRead32();
+            gpio0->data = 0xb0;
+            uint32_t bytes = UartRead32();
+            gpio0->data = 0x30;
+
+            uint8_t* start = reinterpret_cast<uint8_t*>(addr);
+            uint8_t* end = reinterpret_cast<uint8_t*>(addr + bytes);
+            for (uint8_t* ptr = start; ptr < end; ptr++) {
+                *ptr = UartRead();
+            }
+
+            UartWrite('a');
+            UartWrite(bytes);
+            gpio0->data = 0xf0;
+        } else if (c == 'j') {
+            uint32_t addr = UartRead32();
+
+            gpio0->data = 0x55;
+
+            auto jump = reinterpret_cast<void (*)()>(addr);
+            jump();
+        }
+    }
+}