feat!: add VirtIO 9P device

src/Makefile

@@ -151,6 +151,9 @@ INCS+= \
 	-I../third-party/mongoose-7.12 \
 	$(BOOST_INC)
 
+# Use 64-bit offsets for file operations in POSIX APIs
+DEFS+=-D_FILE_OFFSET_BITS=64
+
 ifeq ($(dump),yes)
 #DEFS+=-DDUMP_ILLEGAL_INSN_EXCEPTIONS
 #DEFS+=-DDUMP_EXCEPTIONS
@@ -319,6 +322,7 @@ LIBCARTESI_OBJS:= \
 	virtio-factory.o \
 	virtio-device.o \
 	virtio-console.o \
+	virtio-p9fs.o \
 	dtb.o \
 	os.o \
 	htif.o \

src/dtb.cpp

@@ -151,6 +151,16 @@ void dtb_init(const machine_config &c, unsigned char *dtb_start, uint64_t dtb_le
                 fdt.prop_u32_list<2>("interrupts-extended", {PLIC_PHANDLE, plic_irq_id});
                 fdt.end_node();
             }
+            if (c.htif.console_getchar) { // virtio 9p
+                const uint32_t virtio_idx = 1;
+                const uint64_t virtio_paddr = PMA_FIRST_VIRTIO_START + virtio_idx * PMA_VIRTIO_LENGTH;
+                const uint32_t plic_irq_id = virtio_idx + 1;
+                fdt.begin_node_num("virtio", virtio_paddr);
+                fdt.prop_string("compatible", "virtio,mmio");
+                fdt.prop_u64_list<2>("reg", {virtio_paddr, PMA_VIRTIO_LENGTH});
+                fdt.prop_u32_list<2>("interrupts-extended", {PLIC_PHANDLE, plic_irq_id});
+                fdt.end_node();
+            }
             fdt.end_node();
         }
 

src/machine.cpp

@@ -47,6 +47,7 @@
 #include "unique-c-ptr.h"
 #include "virtio-console.h"
 #include "virtio-factory.h"
+#include "virtio-p9fs.h"
 
 /// \file
 /// \brief Cartesi machine implementation
@@ -448,6 +449,13 @@ machine::machine(const machine_config &c, const machine_runtime_config &r) :
             make_virtio_pma_entry(PMA_FIRST_VIRTIO_START + vdev_console->get_virtio_index() * PMA_VIRTIO_LENGTH,
                 PMA_VIRTIO_LENGTH, "VirtIO console device", &virtio_driver, vdev_console.get()));
         m_vdevs.push_back(std::move(vdev_console));
+
+        // Register VirtIO Plan 9 filesystem device
+        auto vdev_p9fs = std::make_unique<virtio_p9fs_device>(m_vdevs.size(), "vfs0", "/tmp");
+        register_pma_entry(
+            make_virtio_pma_entry(PMA_FIRST_VIRTIO_START + vdev_p9fs->get_virtio_index() * PMA_VIRTIO_LENGTH,
+                PMA_VIRTIO_LENGTH, "VirtIO p9fs device", &virtio_driver, vdev_p9fs.get()));
+        m_vdevs.push_back(std::move(vdev_p9fs));
     }
 
     // Initialize DTB