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- /*
- * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER );
-
- #include <assert.h>
- #include <gpxe/io.h>
- #include <gpxe/efi/efi.h>
- #include <gpxe/efi/Protocol/CpuIo.h>
- #include <gpxe/efi/efi_io.h>
-
- /** @file
- *
- * gPXE I/O API for EFI
- *
- */
-
- /** CPU I/O protocol */
- static EFI_CPU_IO_PROTOCOL *cpu_io;
- EFI_REQUIRE_PROTOCOL ( EFI_CPU_IO_PROTOCOL, &cpu_io );
-
- /** Maximum address that can be used for port I/O */
- #define MAX_PORT_ADDRESS 0xffff
-
- /**
- * Determine whether or not address is a port I/O address
- *
- * @v io_addr I/O address
- * @v is_port I/O address is a port I/O address
- */
- #define IS_PORT_ADDRESS(io_addr) \
- ( ( ( intptr_t ) (io_addr) ) <= MAX_PORT_ADDRESS )
-
- /**
- * Determine EFI CPU I/O width code
- *
- * @v size Size of value
- * @ret width EFI width code
- *
- * Someone at Intel clearly gets paid by the number of lines of code
- * they write. No-one should ever be able to make I/O this
- * convoluted. The EFI_CPU_IO_PROTOCOL_WIDTH enum is my favourite
- * idiocy.
- */
- static EFI_CPU_IO_PROTOCOL_WIDTH efi_width ( size_t size ) {
- switch ( size ) {
- case 1 : return EfiCpuIoWidthFifoUint8;
- case 2 : return EfiCpuIoWidthFifoUint16;
- case 4 : return EfiCpuIoWidthFifoUint32;
- case 8 : return EfiCpuIoWidthFifoUint64;
- default :
- assert ( 0 );
- /* I wonder what this will actually do... */
- return EfiCpuIoWidthMaximum;
- }
- }
-
- /**
- * Read from device
- *
- * @v io_addr I/O address
- * @v size Size of value
- * @ret data Value read
- */
- unsigned long long efi_ioread ( volatile void *io_addr, size_t size ) {
- EFI_CPU_IO_PROTOCOL_IO_MEM read;
- unsigned long long data = 0;
- EFI_STATUS efirc;
-
- read = ( IS_PORT_ADDRESS ( io_addr ) ?
- cpu_io->Io.Read : cpu_io->Mem.Read );
-
- if ( ( efirc = read ( cpu_io, efi_width ( size ),
- ( intptr_t ) io_addr, 1,
- ( void * ) &data ) ) != 0 ) {
- DBG ( "EFI I/O read at %p failed: %s\n",
- io_addr, efi_strerror ( efirc ) );
- return -1ULL;
- }
-
- return data;
- }
-
- /**
- * Write to device
- *
- * @v data Value to write
- * @v io_addr I/O address
- * @v size Size of value
- */
- void efi_iowrite ( unsigned long long data, volatile void *io_addr,
- size_t size ) {
- EFI_CPU_IO_PROTOCOL_IO_MEM write;
- EFI_STATUS efirc;
-
- write = ( IS_PORT_ADDRESS ( io_addr ) ?
- cpu_io->Io.Write : cpu_io->Mem.Write );
-
- if ( ( efirc = write ( cpu_io, efi_width ( size ),
- ( intptr_t ) io_addr, 1,
- ( void * ) &data ) ) != 0 ) {
- DBG ( "EFI I/O write at %p failed: %s\n",
- io_addr, efi_strerror ( efirc ) );
- }
- }
-
- /**
- * String read from device
- *
- * @v io_addr I/O address
- * @v data Data buffer
- * @v size Size of values
- * @v count Number of values to read
- */
- void efi_ioreads ( volatile void *io_addr, void *data,
- size_t size, unsigned int count ) {
- EFI_CPU_IO_PROTOCOL_IO_MEM read;
- EFI_STATUS efirc;
-
- read = ( IS_PORT_ADDRESS ( io_addr ) ?
- cpu_io->Io.Read : cpu_io->Mem.Read );
-
- if ( ( efirc = read ( cpu_io, efi_width ( size ),
- ( intptr_t ) io_addr, count,
- ( void * ) data ) ) != 0 ) {
- DBG ( "EFI I/O string read at %p failed: %s\n",
- io_addr, efi_strerror ( efirc ) );
- }
- }
-
- /**
- * String write to device
- *
- * @v io_addr I/O address
- * @v data Data buffer
- * @v size Size of values
- * @v count Number of values to write
- */
- void efi_iowrites ( volatile void *io_addr, const void *data,
- size_t size, unsigned int count ) {
- EFI_CPU_IO_PROTOCOL_IO_MEM write;
- EFI_STATUS efirc;
-
- write = ( IS_PORT_ADDRESS ( io_addr ) ?
- cpu_io->Io.Write : cpu_io->Mem.Write );
-
- if ( ( efirc = write ( cpu_io, efi_width ( size ),
- ( intptr_t ) io_addr, count,
- ( void * ) data ) ) != 0 ) {
- DBG ( "EFI I/O write at %p failed: %s\n",
- io_addr, efi_strerror ( efirc ) );
- }
- }
-
- /**
- * Wait for I/O-mapped operation to complete
- *
- */
- static void efi_iodelay ( void ) {
- /* Write to non-existent port. Probably x86-only. */
- outb ( 0, 0x80 );
- }
-
- PROVIDE_IOAPI_INLINE ( efi, phys_to_bus );
- PROVIDE_IOAPI_INLINE ( efi, bus_to_phys );
- PROVIDE_IOAPI_INLINE ( efi, ioremap );
- PROVIDE_IOAPI_INLINE ( efi, iounmap );
- PROVIDE_IOAPI_INLINE ( efi, io_to_bus );
- PROVIDE_IOAPI_INLINE ( efi, readb );
- PROVIDE_IOAPI_INLINE ( efi, readw );
- PROVIDE_IOAPI_INLINE ( efi, readl );
- PROVIDE_IOAPI_INLINE ( efi, readq );
- PROVIDE_IOAPI_INLINE ( efi, writeb );
- PROVIDE_IOAPI_INLINE ( efi, writew );
- PROVIDE_IOAPI_INLINE ( efi, writel );
- PROVIDE_IOAPI_INLINE ( efi, writeq );
- PROVIDE_IOAPI_INLINE ( efi, inb );
- PROVIDE_IOAPI_INLINE ( efi, inw );
- PROVIDE_IOAPI_INLINE ( efi, inl );
- PROVIDE_IOAPI_INLINE ( efi, outb );
- PROVIDE_IOAPI_INLINE ( efi, outw );
- PROVIDE_IOAPI_INLINE ( efi, outl );
- PROVIDE_IOAPI_INLINE ( efi, insb );
- PROVIDE_IOAPI_INLINE ( efi, insw );
- PROVIDE_IOAPI_INLINE ( efi, insl );
- PROVIDE_IOAPI_INLINE ( efi, outsb );
- PROVIDE_IOAPI_INLINE ( efi, outsw );
- PROVIDE_IOAPI_INLINE ( efi, outsl );
- PROVIDE_IOAPI ( efi, iodelay, efi_iodelay );
- PROVIDE_IOAPI_INLINE ( efi, mb );
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