modules

dev/block/Kconfig

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+menu "Block device drivers"
+
+source "dev/block/nvme/Kconfig"
+
+endmenu

dev/block/meson.build

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+if kconfig.get('CONFIG_NVME_CORE', 'n') != 'n'
+    subdir('nvme')
+endif

dev/block/nvme/Kconfig

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+menu "NVMe Support"
+
+config NVME_CORE
+  bool
+  default y
+
+config NVME_PCI
+  bool "NVMe via PCI transport"
+  default y
+  depends on PCI
+  depends on NVME_CORE
+
+endmenu

dev/block/nvme/core.c

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+#include <zinnia/cmdline.h>
+#include <zinnia/module.h>
+#include <zinnia/print.h>
+
+void nvme_init(struct module* mod) {
+    log("Hello world from NVMe!\n");
+}
+
+void do_nvme(bool on) {}
+CMDLINE_OPTION("nvme_on", "My description", do_nvme);
+
+MODULE("NVME", "Marvin Friedrich", "ISC", "1.0", nvme_init);

dev/block/nvme/meson.build

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+nvme_sources = files('core.c')
+
+if kconfig.get('CONFIG_NVME_PCI', 'n') == 'y'
+    nvme_sources += files('pci.c')
+endif
+
+modules += {
+    'nvme': {
+        'modular': true, #kconfig.get('CONFIG_NVME_CORE') == 'm',
+        'sources': nvme_sources,
+    },
+}

dev/block/nvme/spec.h

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+#pragma once