80 lines
6.8 KiB
Markdown
80 lines
6.8 KiB
Markdown
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---
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title: pci.h
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summary: PCI bus stuff
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---
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# Class and subclasses enums
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All these enums are not documented in here, because they are basically just the definitions matching the PCI device main and sub classes.
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A [list of these (sub)classes](https://wiki.osdev.org/PCI#Class_Codes) can be found in the osdev wiki.
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# `pci_device_header_T` - struct
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| Name | Type | Description |
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|-----------------|----------|------------------------------------------------------------------------------------------------------------------------------|
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| vendor_id | uint16_t | The Device manufacturers ID number |
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| device_id | uint16_t | The devices ID number |
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| command_reg | uint16_t | Provides control over a device's ability to generate and respond to PCI cycles. |
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| status | uint16_t | The status register PCI bus related events |
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| revision_id | uint8_t | The devices revision ID number |
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| progif | uint8_t | Programming Interface Byte. This can specify special programming interfaces. |
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| subclass | uint8_t | The special function that the device performs. |
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| main_class | uint8_t | The general function class, which the device operates in. |
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| cache_line_size | uint8_t | Specifies the system cache line size in 32-bit units. |
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| latency_timer | uint8_t | Specifies the latency timer in units of PCI bus clocks. |
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| header_type | uint8_t | Specifies whether the device is a general device or a bridge. This affects the data representation that follows this header. |
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| bist | uint8_t | Built-In-Self-Test status and control. |
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# `pci_header_0_T` - struct
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| Name | Type | Description |
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|----------------------------|---------------------|-------------------------------------------------------------------------------------------------|
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| header | pci_device_header_T | The devices base header |
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| bar0 | uint32_t | Base address 0 |
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| bar1 | uint32_t | Base address 1 |
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| bar2 | uint32_t | Base address 2 |
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| bar3 | uint32_t | Base address 3 |
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| bar4 | uint32_t | Base address 4 |
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| bar5 | uint32_t | Base address 5 |
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| cardbus_cis_pointer | uint32_t | Used by devices that share silicon between CardBus and PCI. |
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| subsystem_vendor_id | uint16_t | idk, but probably not that important |
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| subsystem_id | uint16_t | idk, but probably not that important |
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| expansion_rom_base_address | uint32_t | An optional max 16MB ROM BAR. |
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| capabilities | uint8_t | An offset in the devices config space that points to a linked list of implemented capabilities. |
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| reserved | uint8_t[7] | Reserved. |
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| interrupt_line | uint8_t | The devices interrupt IRQ. |
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| interrupt_pin | uint8_t | The devices interrupt pin. |
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| min_grant | uint8_t | Specifies the burst period length, in 1/4 microsecond units, that the device needs. |
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| max_latency | uint8_t | Specifies how often the device needs access to the PCI bus (in 1/4 microsecond units). |
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# `pci_device_T` - struct
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| Name | Type | Description |
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|--------|----------------------|-------------------------|
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| header | pci_device_header_T* | The devices base header |
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| prev | pci_device_T* | The previous device. |
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| next | pci_device_T* | The next device. |
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# `pci_manager_T` - struct
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| Name | Type | Description |
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|---------|---------------|-----------------------------------------------|
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| devices | pci_device_T* | The linked list of devices connected via PCI. |
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# `pci_init()` - function (void)
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Initializes the global PCI manager and enumerates the PCI bus.
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This needs to be called after `acpi_init`, because it uses the _MCFG_ table.
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# `pci_manager_add_device(header*)` - function (void)
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Adds a device to the global PCI manager.
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This should only be called by the PCI enumerator.
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# `pci_manager_remove_device(device*)` - function (void)
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Removes a device from the global PCI manager, and frees it resources in the manager.
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# `pci_manager_find_device(class, subclass, progif)` - function (pci_device_T*)
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Returns the first device with **_class_**, **_subclass_** and **_progif_** that is defined in the global PCI manager.
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# `pci_manager_dump_devices()` - function (void)
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Logs a list of all registered PCI devices.
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# `pci_get_subclass_string(class, subclass)` - function (string_t)
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Returns the Name of **_class_** + **_subclass_**.
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# `pci_get_vendor_string(vendor_id)` - function (string_t)
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Returns the name of the vendor.
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