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-rw-r--r--src/device/device_util.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/src/device/device_util.c b/src/device/device_util.c
index d2c99e1980..cad2a06b20 100644
--- a/src/device/device_util.c
+++ b/src/device/device_util.c
@@ -158,6 +158,61 @@ struct device *dev_find_class(unsigned int class, struct device *from)
return from;
}
+/**
+ * Encode the device path into 3 bytes for logging to CMOS.
+ *
+ * @param dev The device path to encode.
+ * @return Device path encoded into lower 3 bytes of dword.
+ */
+u32 dev_path_encode(device_t dev)
+{
+ u32 ret;
+
+ if (!dev)
+ return 0;
+
+ /* Store the device type in 3rd byte. */
+ ret = dev->path.type << 16;
+
+ /* Encode the device specific path in the low word. */
+ switch (dev->path.type) {
+ case DEVICE_PATH_ROOT:
+ break;
+ case DEVICE_PATH_PCI:
+ ret |= dev->bus->secondary << 8 | dev->path.pci.devfn;
+ break;
+ case DEVICE_PATH_PNP:
+ ret |= dev->path.pnp.port << 8 | dev->path.pnp.device;
+ break;
+ case DEVICE_PATH_I2C:
+ ret |= dev->bus->secondary << 8 | dev->path.pnp.device;
+ break;
+ case DEVICE_PATH_APIC:
+ ret |= dev->path.apic.apic_id;
+ break;
+ case DEVICE_PATH_DOMAIN:
+ ret |= dev->path.domain.domain;
+ break;
+ case DEVICE_PATH_CPU_CLUSTER:
+ ret |= dev->path.cpu_cluster.cluster;
+ break;
+ case DEVICE_PATH_CPU:
+ ret |= dev->path.cpu.id;
+ break;
+ case DEVICE_PATH_CPU_BUS:
+ ret |= dev->path.cpu_bus.id;
+ break;
+ case DEVICE_PATH_IOAPIC:
+ ret |= dev->path.ioapic.ioapic_id;
+ break;
+ case DEVICE_PATH_NONE:
+ default:
+ break;
+ }
+
+ return ret;
+}
+
/*
* Warning: This function uses a static buffer. Don't call it more than once
* from the same print statement!