ecam.h

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#ifndef _IPXE_ECAM_H
#define _IPXE_ECAM_H

/** @file
 *
 * PCI I/O API for Enhanced Configuration Access Mechanism (ECAM)
 *
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <ipxe/acpi.h>
#include <ipxe/pci.h>

/** Enhanced Configuration Access Mechanism per-device size */
#define ECAM_SIZE 4096

/** Enhanced Configuration Access Mechanism table signature */
#define ECAM_SIGNATURE ACPI_SIGNATURE ( 'M', 'C', 'F', 'G' )

/** An Enhanced Configuration Access Mechanism allocation */
struct ecam_allocation {
        /** Base address */
        uint64_t base;
        /** PCI segment number */
        uint16_t segment;
        /** Start PCI bus number */
        uint8_t start;
        /** End PCI bus number */
        uint8_t end;
        /** Reserved */
        uint8_t reserved[4];
} __attribute__ (( packed ));

/** An Enhanced Configuration Access Mechanism table */
struct ecam_table {
        /** ACPI header */
        struct acpi_header acpi;
        /** Reserved */
        uint8_t reserved[8];
        /** Allocation structures */
        struct ecam_allocation alloc[0];
} __attribute__ (( packed ));

/** A mapped Enhanced Configuration Access Mechanism allocation */
struct ecam_mapping {
        /** Allocation */
        struct ecam_allocation alloc;
        /** PCI bus:dev.fn address range */
        struct pci_range range;
        /** MMIO base address */
        void *regs;
        /** Mapping result */
        int rc;
};

extern struct pci_api ecam_api;

#endif /* _IPXE_ECAM_H */