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Annotation of qemu/roms/ipxe/src/interface/efi/efi_io.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (C) 2008 Michael Brown <[email protected]>.
        !             3:  *
        !             4:  * This program is free software; you can redistribute it and/or
        !             5:  * modify it under the terms of the GNU General Public License as
        !             6:  * published by the Free Software Foundation; either version 2 of the
        !             7:  * License, or any later version.
        !             8:  *
        !             9:  * This program is distributed in the hope that it will be useful, but
        !            10:  * WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            12:  * General Public License for more details.
        !            13:  *
        !            14:  * You should have received a copy of the GNU General Public License
        !            15:  * along with this program; if not, write to the Free Software
        !            16:  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            17:  */
        !            18: 
        !            19: FILE_LICENCE ( GPL2_OR_LATER );
        !            20: 
        !            21: #include <assert.h>
        !            22: #include <ipxe/io.h>
        !            23: #include <ipxe/efi/efi.h>
        !            24: #include <ipxe/efi/Protocol/CpuIo.h>
        !            25: #include <ipxe/efi/efi_io.h>
        !            26: 
        !            27: /** @file
        !            28:  *
        !            29:  * iPXE I/O API for EFI
        !            30:  *
        !            31:  */
        !            32: 
        !            33: /** CPU I/O protocol */
        !            34: static EFI_CPU_IO_PROTOCOL *cpu_io;
        !            35: EFI_REQUIRE_PROTOCOL ( EFI_CPU_IO_PROTOCOL, &cpu_io );
        !            36: 
        !            37: /** Maximum address that can be used for port I/O */
        !            38: #define MAX_PORT_ADDRESS 0xffff
        !            39: 
        !            40: /**
        !            41:  * Determine whether or not address is a port I/O address
        !            42:  *
        !            43:  * @v io_addr          I/O address
        !            44:  * @v is_port          I/O address is a port I/O address
        !            45:  */
        !            46: #define IS_PORT_ADDRESS(io_addr) \
        !            47:        ( ( ( intptr_t ) (io_addr) ) <= MAX_PORT_ADDRESS )
        !            48: 
        !            49: /**
        !            50:  * Determine EFI CPU I/O width code
        !            51:  *
        !            52:  * @v size             Size of value
        !            53:  * @ret width          EFI width code
        !            54:  *
        !            55:  * Someone at Intel clearly gets paid by the number of lines of code
        !            56:  * they write.  No-one should ever be able to make I/O this
        !            57:  * convoluted.  The EFI_CPU_IO_PROTOCOL_WIDTH enum is my favourite
        !            58:  * idiocy.
        !            59:  */
        !            60: static EFI_CPU_IO_PROTOCOL_WIDTH efi_width ( size_t size ) {
        !            61:        switch ( size ) {
        !            62:        case 1 :        return EfiCpuIoWidthFifoUint8;
        !            63:        case 2 :        return EfiCpuIoWidthFifoUint16;
        !            64:        case 4 :        return EfiCpuIoWidthFifoUint32;
        !            65:        case 8 :        return EfiCpuIoWidthFifoUint64;
        !            66:        default :
        !            67:                assert ( 0 );
        !            68:                /* I wonder what this will actually do... */
        !            69:                return EfiCpuIoWidthMaximum;
        !            70:        }
        !            71: }
        !            72: 
        !            73: /**
        !            74:  * Read from device
        !            75:  *
        !            76:  * @v io_addr          I/O address
        !            77:  * @v size             Size of value
        !            78:  * @ret data           Value read
        !            79:  */
        !            80: unsigned long long efi_ioread ( volatile void *io_addr, size_t size ) {
        !            81:        EFI_CPU_IO_PROTOCOL_IO_MEM read;
        !            82:        unsigned long long data = 0;
        !            83:        EFI_STATUS efirc;
        !            84: 
        !            85:        read = ( IS_PORT_ADDRESS ( io_addr ) ?
        !            86:                 cpu_io->Io.Read : cpu_io->Mem.Read );
        !            87: 
        !            88:        if ( ( efirc = read ( cpu_io, efi_width ( size ),
        !            89:                              ( intptr_t ) io_addr, 1,
        !            90:                              ( void * ) &data ) ) != 0 ) {
        !            91:                DBG ( "EFI I/O read at %p failed: %s\n",
        !            92:                      io_addr, efi_strerror ( efirc ) );
        !            93:                return -1ULL;
        !            94:        }
        !            95: 
        !            96:        return data;
        !            97: }
        !            98: 
        !            99: /**
        !           100:  * Write to device
        !           101:  *
        !           102:  * @v data             Value to write
        !           103:  * @v io_addr          I/O address
        !           104:  * @v size             Size of value
        !           105:  */
        !           106: void efi_iowrite ( unsigned long long data, volatile void *io_addr,
        !           107:                   size_t size ) {
        !           108:        EFI_CPU_IO_PROTOCOL_IO_MEM write;
        !           109:        EFI_STATUS efirc;
        !           110: 
        !           111:        write = ( IS_PORT_ADDRESS ( io_addr ) ?
        !           112:                  cpu_io->Io.Write : cpu_io->Mem.Write );
        !           113: 
        !           114:        if ( ( efirc = write ( cpu_io, efi_width ( size ),
        !           115:                               ( intptr_t ) io_addr, 1,
        !           116:                               ( void * ) &data ) ) != 0 ) {
        !           117:                DBG ( "EFI I/O write at %p failed: %s\n",
        !           118:                      io_addr, efi_strerror ( efirc ) );
        !           119:        }
        !           120: }
        !           121: 
        !           122: /**
        !           123:  * String read from device
        !           124:  *
        !           125:  * @v io_addr          I/O address
        !           126:  * @v data             Data buffer
        !           127:  * @v size             Size of values
        !           128:  * @v count            Number of values to read
        !           129:  */
        !           130: void efi_ioreads ( volatile void *io_addr, void *data,
        !           131:                   size_t size, unsigned int count ) {
        !           132:        EFI_CPU_IO_PROTOCOL_IO_MEM read;
        !           133:        EFI_STATUS efirc;
        !           134: 
        !           135:        read = ( IS_PORT_ADDRESS ( io_addr ) ?
        !           136:                 cpu_io->Io.Read : cpu_io->Mem.Read );
        !           137: 
        !           138:        if ( ( efirc = read ( cpu_io, efi_width ( size ),
        !           139:                              ( intptr_t ) io_addr, count,
        !           140:                              ( void * ) data ) ) != 0 ) {
        !           141:                DBG ( "EFI I/O string read at %p failed: %s\n",
        !           142:                      io_addr, efi_strerror ( efirc ) );
        !           143:        }
        !           144: }
        !           145: 
        !           146: /**
        !           147:  * String write to device
        !           148:  *
        !           149:  * @v io_addr          I/O address
        !           150:  * @v data             Data buffer
        !           151:  * @v size             Size of values
        !           152:  * @v count            Number of values to write
        !           153:  */
        !           154: void efi_iowrites ( volatile void *io_addr, const void *data,
        !           155:                    size_t size, unsigned int count ) {
        !           156:        EFI_CPU_IO_PROTOCOL_IO_MEM write;
        !           157:        EFI_STATUS efirc;
        !           158: 
        !           159:        write = ( IS_PORT_ADDRESS ( io_addr ) ?
        !           160:                 cpu_io->Io.Write : cpu_io->Mem.Write );
        !           161: 
        !           162:        if ( ( efirc = write ( cpu_io, efi_width ( size ),
        !           163:                               ( intptr_t ) io_addr, count,
        !           164:                               ( void * ) data ) ) != 0 ) {
        !           165:                DBG ( "EFI I/O write at %p failed: %s\n",
        !           166:                      io_addr, efi_strerror ( efirc ) );
        !           167:        }
        !           168: }
        !           169: 
        !           170: /**
        !           171:  * Wait for I/O-mapped operation to complete
        !           172:  *
        !           173:  */
        !           174: static void efi_iodelay ( void ) {
        !           175:        /* Write to non-existent port.  Probably x86-only. */
        !           176:        outb ( 0, 0x80 );
        !           177: }
        !           178: 
        !           179: /**
        !           180:  * Get memory map
        !           181:  *
        !           182:  * Can't be done on EFI so return an empty map
        !           183:  *
        !           184:  * @v memmap           Memory map to fill in
        !           185:  */
        !           186: static void efi_get_memmap ( struct memory_map *memmap ) {
        !           187:        memmap->count = 0;
        !           188: }
        !           189: 
        !           190: PROVIDE_IOAPI_INLINE ( efi, phys_to_bus );
        !           191: PROVIDE_IOAPI_INLINE ( efi, bus_to_phys );
        !           192: PROVIDE_IOAPI_INLINE ( efi, ioremap );
        !           193: PROVIDE_IOAPI_INLINE ( efi, iounmap );
        !           194: PROVIDE_IOAPI_INLINE ( efi, io_to_bus );
        !           195: PROVIDE_IOAPI_INLINE ( efi, readb );
        !           196: PROVIDE_IOAPI_INLINE ( efi, readw );
        !           197: PROVIDE_IOAPI_INLINE ( efi, readl );
        !           198: PROVIDE_IOAPI_INLINE ( efi, readq );
        !           199: PROVIDE_IOAPI_INLINE ( efi, writeb );
        !           200: PROVIDE_IOAPI_INLINE ( efi, writew );
        !           201: PROVIDE_IOAPI_INLINE ( efi, writel );
        !           202: PROVIDE_IOAPI_INLINE ( efi, writeq );
        !           203: PROVIDE_IOAPI_INLINE ( efi, inb );
        !           204: PROVIDE_IOAPI_INLINE ( efi, inw );
        !           205: PROVIDE_IOAPI_INLINE ( efi, inl );
        !           206: PROVIDE_IOAPI_INLINE ( efi, outb );
        !           207: PROVIDE_IOAPI_INLINE ( efi, outw );
        !           208: PROVIDE_IOAPI_INLINE ( efi, outl );
        !           209: PROVIDE_IOAPI_INLINE ( efi, insb );
        !           210: PROVIDE_IOAPI_INLINE ( efi, insw );
        !           211: PROVIDE_IOAPI_INLINE ( efi, insl );
        !           212: PROVIDE_IOAPI_INLINE ( efi, outsb );
        !           213: PROVIDE_IOAPI_INLINE ( efi, outsw );
        !           214: PROVIDE_IOAPI_INLINE ( efi, outsl );
        !           215: PROVIDE_IOAPI ( efi, iodelay, efi_iodelay );
        !           216: PROVIDE_IOAPI_INLINE ( efi, mb );
        !           217: PROVIDE_IOAPI ( efi, get_memmap, efi_get_memmap );

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