267 lines
8.0 KiB
C
267 lines
8.0 KiB
C
/*
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* Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <string.h>
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#include <errno.h>
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#include <byteswap.h>
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#include <ipxe/init.h>
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#include <ipxe/settings.h>
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#include <ipxe/cpuid.h>
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/** @file
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*
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* x86 CPUID settings
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*
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* CPUID settings are numerically encoded as:
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*
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* Bit 31 Extended function
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* Bits 30-24 (bit 22 = 1) Subfunction number
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* (bit 22 = 0) Number of consecutive functions to call, minus one
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* Bit 23 Return result as little-endian (used for strings)
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* Bit 22 Interpret bits 30-24 as a subfunction number
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* Bits 21-18 Unused
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* Bits 17-16 Number of registers in register array, minus one
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* Bits 15-8 Array of register indices. First entry in array is in
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* bits 9-8. Indices are 0-%eax, 1-%ebx, 2-%ecx, 3-%edx.
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* Bits 7-0 Starting function number (excluding "extended" bit)
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*
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* This encoding scheme is designed to allow the common case of
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* extracting a single register from a single function to be encoded
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* using "cpuid/<register>.<function>", e.g. "cpuid/2.0x80000001" to
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* retrieve the value of %ecx from calling CPUID with %eax=0x80000001.
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*
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* A subfunction (i.e. an input value for %ecx) may be specified using
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* "cpuid/<subfunction>.0x40.<register>.<function>". This slightly
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* cumbersome syntax is required in order to maintain backwards
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* compatibility with older scripts.
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*/
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/** CPUID setting tag register indices */
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enum cpuid_registers {
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CPUID_EAX = 0,
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CPUID_EBX = 1,
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CPUID_ECX = 2,
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CPUID_EDX = 3,
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};
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/** CPUID setting tag flags */
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enum cpuid_flags {
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CPUID_LITTLE_ENDIAN = 0x00800000UL,
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CPUID_USE_SUBFUNCTION = 0x00400000UL,
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};
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/**
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* Construct CPUID setting tag
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*
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* @v function Starting function number
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* @v subfunction Subfunction, or number of consecutive functions minus 1
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* @v flags Flags
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* @v num_registers Number of registers in register array
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* @v register1 First register in register array (or zero, if empty)
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* @v register2 Second register in register array (or zero, if empty)
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* @v register3 Third register in register array (or zero, if empty)
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* @v register4 Fourth register in register array (or zero, if empty)
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* @ret tag Setting tag
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*/
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#define CPUID_TAG( function, subfunction, flags, num_registers, \
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register1, register2, register3, register4 ) \
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( (function) | ( (subfunction) << 24 ) | (flags) | \
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( ( (num_registers) - 1 ) << 16 ) | \
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( (register1) << 8 ) | ( (register2) << 10 ) | \
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( (register3) << 12 ) | ( (register4) << 14 ) )
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/**
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* Extract starting function number from CPUID setting tag
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*
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* @v tag Setting tag
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* @ret function Starting function number
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*/
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#define CPUID_FUNCTION( tag ) ( (tag) & 0x800000ffUL )
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/**
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* Extract subfunction number from CPUID setting tag
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*
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* @v tag Setting tag
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* @ret subfunction Subfunction number
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*/
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#define CPUID_SUBFUNCTION( tag ) ( ( (tag) >> 24 ) & 0x7f )
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/**
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* Extract register array from CPUID setting tag
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*
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* @v tag Setting tag
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* @ret registers Register array
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*/
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#define CPUID_REGISTERS( tag ) ( ( (tag) >> 8 ) & 0xff )
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/**
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* Extract number of registers from CPUID setting tag
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*
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* @v tag Setting tag
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* @ret num_registers Number of registers within register array
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*/
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#define CPUID_NUM_REGISTERS( tag ) ( ( ( (tag) >> 16 ) & 0x3 ) + 1 )
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/** CPUID settings scope */
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static const struct settings_scope cpuid_settings_scope;
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/**
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* Check applicability of CPUID setting
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*
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* @v settings Settings block
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* @v setting Setting
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* @ret applies Setting applies within this settings block
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*/
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static int cpuid_settings_applies ( struct settings *settings __unused,
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const struct setting *setting ) {
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return ( setting->scope == &cpuid_settings_scope );
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}
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/**
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* Fetch value of CPUID setting
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*
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* @v settings Settings block
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* @v setting Setting to fetch
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* @v data Buffer to fill with setting data
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* @v len Length of buffer
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* @ret len Length of setting data, or negative error
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*/
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static int cpuid_settings_fetch ( struct settings *settings,
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struct setting *setting,
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void *data, size_t len ) {
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uint32_t function;
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uint32_t subfunction;
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uint32_t num_functions;
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uint32_t registers;
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uint32_t num_registers;
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uint32_t buf[4];
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uint32_t output;
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size_t frag_len;
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size_t result_len = 0;
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int rc;
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/* Call each function in turn */
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function = CPUID_FUNCTION ( setting->tag );
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subfunction = CPUID_SUBFUNCTION ( setting->tag );
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if ( setting->tag & CPUID_USE_SUBFUNCTION ) {
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num_functions = 1;
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} else {
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num_functions = ( subfunction + 1 );
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subfunction = 0;
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}
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for ( ; num_functions-- ; function++ ) {
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/* Fail if this function is not supported */
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if ( ( rc = cpuid_supported ( function ) ) != 0 ) {
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DBGC ( settings, "CPUID function %#08x not supported: "
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"%s\n", function, strerror ( rc ) );
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return rc;
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}
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/* Issue CPUID */
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cpuid ( function, subfunction, &buf[CPUID_EAX],
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&buf[CPUID_EBX], &buf[CPUID_ECX], &buf[CPUID_EDX] );
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DBGC ( settings, "CPUID %#08x:%x => %#08x:%#08x:%#08x:%#08x\n",
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function, subfunction, buf[0], buf[1], buf[2], buf[3] );
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/* Copy results to buffer */
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registers = CPUID_REGISTERS ( setting->tag );
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num_registers = CPUID_NUM_REGISTERS ( setting->tag );
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for ( ; num_registers-- ; registers >>= 2 ) {
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output = buf[ registers & 0x3 ];
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if ( ! ( setting->tag & CPUID_LITTLE_ENDIAN ) )
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output = cpu_to_be32 ( output );
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frag_len = sizeof ( output );
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if ( frag_len > len )
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frag_len = len;
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memcpy ( data, &output, frag_len );
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data += frag_len;
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len -= frag_len;
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result_len += sizeof ( output );
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}
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}
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/* Set type if not already specified */
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if ( ! setting->type )
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setting->type = &setting_type_hexraw;
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return result_len;
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}
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/** CPUID settings operations */
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static struct settings_operations cpuid_settings_operations = {
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.applies = cpuid_settings_applies,
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.fetch = cpuid_settings_fetch,
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};
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/** CPUID settings */
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static struct settings cpuid_settings = {
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.refcnt = NULL,
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.siblings = LIST_HEAD_INIT ( cpuid_settings.siblings ),
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.children = LIST_HEAD_INIT ( cpuid_settings.children ),
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.op = &cpuid_settings_operations,
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.default_scope = &cpuid_settings_scope,
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};
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/** Initialise CPUID settings */
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static void cpuid_settings_init ( void ) {
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int rc;
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if ( ( rc = register_settings ( &cpuid_settings, NULL,
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"cpuid" ) ) != 0 ) {
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DBG ( "CPUID could not register settings: %s\n",
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strerror ( rc ) );
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return;
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}
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}
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/** CPUID settings initialiser */
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struct init_fn cpuid_settings_init_fn __init_fn ( INIT_NORMAL ) = {
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.initialise = cpuid_settings_init,
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};
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/** CPU vendor setting */
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const struct setting cpuvendor_setting __setting ( SETTING_HOST_EXTRA,
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cpuvendor ) = {
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.name = "cpuvendor",
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.description = "CPU vendor",
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.tag = CPUID_TAG ( CPUID_VENDOR_ID, 0, CPUID_LITTLE_ENDIAN, 3,
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CPUID_EBX, CPUID_EDX, CPUID_ECX, 0 ),
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.type = &setting_type_string,
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.scope = &cpuid_settings_scope,
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};
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/** CPU model setting */
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const struct setting cpumodel_setting __setting ( SETTING_HOST_EXTRA,
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cpumodel ) = {
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.name = "cpumodel",
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.description = "CPU model",
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.tag = CPUID_TAG ( CPUID_MODEL, 2, CPUID_LITTLE_ENDIAN, 4,
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CPUID_EAX, CPUID_EBX, CPUID_ECX, CPUID_EDX ),
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.type = &setting_type_string,
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.scope = &cpuid_settings_scope,
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};
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