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AGP(4) Kernel Interfaces Manual AGP(4) NAME agp -- generic interface to the Accelerated Graphics Port (AGP) SYNOPSIS device agp DEPRECATION NOTICE The agp driver is slated to be removed in FreeBSD 16.0. DESCRIPTION The agp driver provides uniform, abstract methods for controlling the fol- lowing devices: Ali: M1541, M1621 and M1671 host to AGP bridges AMD: 751, 761 and 762 host to AGP bridges ATI: RS100, RS200, RS250 and RS300 AGP bridges Intel: i820, i840, i845, i850, and i860 host to AGP bridges Intel: i810, i810-DC100, i810E, i815, 830M, 845G, 845M, 852GM, 852GME, 855GM, 855GME, 865G, 915G and 915GM SVGA controllers Intel: 82443BX, 82443GX, 82443LX, 82815, 82820, 82830, 82840, 82845, 82845G, 82850, 82855, 82855GM, 82860, 82865, 82875P, E7205 and E7505 host to AGP bridges NVIDIA: nForce and nForce2 AGP controllers SiS: 530, 540, 550, 620, 630, 645, 645DX, 648, 650, 651, 655, 661, 730, 735, 740, 741, 745, 746, 760 and 5591 host to AGP bridges VIA: 3296, 82C597, 82C598, 82C691, 82C694X, 82C8363, 8235, 8237, 8361, 8367, 8371, 8377, 8501, 8601, 862x, 8633, 8653, 8703, 8753, 8754, 8763, 8783, KT880, PM800, PM880, PN800, PN880, PT880, XM266 and XN266 host to PCI bridges The most common application of agp is for running X(7)(ports/x11/xorg-docs) on the Intel i81x controllers. IOCTLS The following ioctl(2) operations can be performed on /dev/agpgart, which are defined in <sys/agpio.h>: AGPIOC_INFO Returns state of the agp system. The result is a pointer to the following structure: typedef struct _agp_info { agp_version version; /* version of the driver */ uint32_t bridge_id; /* bridge vendor/device */ uint32_t agp_mode; /* mode info of bridge */ off_t aper_base; /* base of aperture */ size_t aper_size; /* size of aperture */ size_t pg_total; /* max pages (swap + system) */ size_t pg_system; /* max pages (system) */ size_t pg_used; /* current pages used */ } agp_info; AGPIOC_ACQUIRE Acquire control of the AGP chipset for use by this client. Returns EBUSY if the AGP chipset is already acquired by another client. AGPIOC_RELEASE Release control of the AGP chipset. This does not unbind or free any allocated memory, which is the responsibility of the client to handle if necessary. AGPIOC_SETUP Enable the AGP hardware with the relevant mode. This ioctl(2) takes the following structure: typedef struct _agp_setup { uint32_t agp_mode; /* mode info of bridge */ } agp_setup; The mode bits are defined in <sys/agpio.h>. AGPIOC_ALLOCATE Allocate physical memory suitable for mapping into the AGP aper- ture. This ioctl(2) takes the following structure: typedef struct _agp_allocate { int key; /* tag of allocation */ size_t pg_count; /* number of pages */ uint32_t type; /* 0 == normal, other devspec */ uint32_t physical; /* device specific (some devices * need a phys address of the * actual page behind the gatt * table) */ } agp_allocate; Returns a handle to the allocated memory. AGPIOC_DEALLOCATE Free the previously allocated memory associated with the handle passed. AGPIOC_BIND Bind the allocated memory at given offset with the AGP aperture. Returns EINVAL if the memory is already bound or the offset is not at AGP page boundary. This ioctl(2) takes the following structure: typedef struct _agp_bind { int key; /* tag of allocation */ off_t pg_start; /* starting page to populate */ } agp_bind; The tag of allocation is the handle returned by AGPIOC_ALLOCATE. AGPIOC_UNBIND Unbind memory from the AGP aperture. Returns EINVAL if the memory is not bound. This ioctl(2) takes the following structure: typedef struct _agp_unbind { int key; /* tag of allocation */ uint32_t priority; /* priority for paging out */ } agp_unbind; FILES /dev/agpgart AGP device node. SEE ALSO X(7)(ports/x11/xorg) HISTORY The agp driver first appeared in FreeBSD 4.1. FreeBSD ports 15.1 October 24, 2025 AGP(4)
NAME | SYNOPSIS | DEPRECATION NOTICE | DESCRIPTION | IOCTLS | FILES | SEE ALSO | HISTORY
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