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[acpi] Make acpi_find_rsdt() a per-platform method 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/49/merge
Michael Brown 2017-05-22 19:27:30 +01:00
parent ee9897fe64
commit 933e6dadc0
11 changed files with 265 additions and 103 deletions
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12
src/arch/arm/include/bits/acpi.h 100644
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@ -0,0 +1,12 @@
#ifndef _BITS_ACPI_H
#define _BITS_ACPI_H
/** @file
*
* ARM-specific ACPI API implementations
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#endif /* _BITS_ACPI_H */

14
src/arch/x86/include/bits/acpi.h 100644
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@ -0,0 +1,14 @@
#ifndef _BITS_ACPI_H
#define _BITS_ACPI_H
/** @file
*
* x86-specific ACPI API implementations
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/rsdp.h>
#endif /* _BITS_ACPI_H */

18
src/arch/x86/include/ipxe/rsdp.h 100644
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@ -0,0 +1,18 @@
#ifndef _IPXE_RSDP_H
#define _IPXE_RSDP_H
/** @file
*
* Standard PC-BIOS ACPI RSDP interface
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#ifdef ACPI_RSDP
#define ACPI_PREFIX_rsdp
#else
#define ACPI_PREFIX_rsdp __rsdp_
#endif
#endif /* _IPXE_RSDP_H */

18
src/arch/x86/interface/pcbios/acpipwr.c
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@ -26,8 +26,6 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <unistd.h>
#include <errno.h>
#include <byteswap.h>
#include <realmode.h>
#include <bios.h>
#include <ipxe/io.h>
#include <ipxe/acpi.h>
#include <ipxe/acpipwr.h>
@ -51,8 +49,6 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
*/
int acpi_poweroff ( void ) {
struct acpi_fadt fadtab;
uint16_t ebda;
userptr_t rsdt;
userptr_t fadt;
unsigned int pm1a_cnt_blk;
unsigned int pm1b_cnt_blk;
@ -63,18 +59,8 @@ int acpi_poweroff ( void ) {
int s5;
int rc;
/* Locate EBDA */
get_real ( ebda, BDA_SEG, BDA_EBDA );
/* Locate RSDT */
rsdt = acpi_find_rsdt ( real_to_user ( ebda, 0 ) );
if ( ! rsdt ) {
DBGC ( colour, "ACPI could not find RSDT (EBDA %04x)\n", ebda );
return -ENOENT;
}
/* Locate FADT */
fadt = acpi_find ( rsdt, FADT_SIGNATURE, 0 );
fadt = acpi_find ( FADT_SIGNATURE, 0 );
if ( ! fadt ) {
DBGC ( colour, "ACPI could not find FADT\n" );
return -ENOENT;
@ -88,7 +74,7 @@ int acpi_poweroff ( void ) {
pm1b_cnt = ( pm1b_cnt_blk + ACPI_PM1_CNT );
/* Extract \_S5 from DSDT or any SSDT */
s5 = acpi_sx ( rsdt, S5_SIGNATURE );
s5 = acpi_sx ( S5_SIGNATURE );
if ( s5 < 0 ) {
rc = s5;
DBGC ( colour, "ACPI could not extract \\_S5: %s\n",

125
src/arch/x86/interface/pcbios/rsdp.c 100644
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@ -0,0 +1,125 @@
/*
* Copyright (C) 2017 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/**
* @file
*
* ACPI Root System Description Pointer
*
*/
#include <stdint.h>
#include <realmode.h>
#include <bios.h>
#include <ipxe/acpi.h>
#include <ipxe/rsdp.h>
/** EBDA RSDP maximum segment */
#define RSDP_EBDA_END_SEG 0xa000
/** Fixed BIOS area RSDP start address */
#define RSDP_BIOS_START 0xe0000
/** Fixed BIOS area RSDP length */
#define RSDP_BIOS_LEN 0x20000
/** Stride at which to search for RSDP */
#define RSDP_STRIDE 16
/**
* Locate ACPI root system description table within a memory range
*
* @v start Start address to search
* @v len Length to search
* @ret rsdt ACPI root system description table, or UNULL
*/
static userptr_t rsdp_find_rsdt_range ( userptr_t start, size_t len ) {
static const char signature[8] = RSDP_SIGNATURE;
struct acpi_rsdp rsdp;
userptr_t rsdt;
size_t offset;
uint8_t sum;
unsigned int i;
/* Search for RSDP */
for ( offset = 0 ; ( ( offset + sizeof ( rsdp ) ) < len ) ;
offset += RSDP_STRIDE ) {
/* Check signature and checksum */
copy_from_user ( &rsdp, start, offset, sizeof ( rsdp ) );
if ( memcmp ( rsdp.signature, signature,
sizeof ( signature ) ) != 0 )
continue;
for ( sum = 0, i = 0 ; i < sizeof ( rsdp ) ; i++ )
sum += *( ( ( uint8_t * ) &rsdp ) + i );
if ( sum != 0 )
continue;
/* Extract RSDT */
rsdt = phys_to_user ( le32_to_cpu ( rsdp.rsdt ) );
DBGC ( rsdt, "RSDT %#08lx found via RSDP %#08lx\n",
user_to_phys ( rsdt, 0 ),
user_to_phys ( start, offset ) );
return rsdt;
}
return UNULL;
}
/**
* Locate ACPI root system description table
*
* @ret rsdt ACPI root system description table, or UNULL
*/
static userptr_t rsdp_find_rsdt ( void ) {
static userptr_t rsdt;
uint16_t ebda_seg;
userptr_t ebda;
size_t ebda_len;
/* Return existing RSDT if already found */
if ( rsdt )
return rsdt;
/* Search EBDA */
get_real ( ebda_seg, BDA_SEG, BDA_EBDA );
if ( ebda_seg < RSDP_EBDA_END_SEG ) {
ebda = real_to_user ( ebda_seg, 0 );
ebda_len = ( ( RSDP_EBDA_END_SEG - ebda_seg ) * 16 );
rsdt = rsdp_find_rsdt_range ( ebda, ebda_len );
if ( rsdt )
return rsdt;
}
/* Search fixed BIOS area */
rsdt = rsdp_find_rsdt_range ( phys_to_user ( RSDP_BIOS_START ),
RSDP_BIOS_LEN );
if ( rsdt )
return rsdt;
return UNULL;
}
PROVIDE_ACPI ( rsdp, acpi_find_rsdt, rsdp_find_rsdt );

1
src/config/defaults/efi.h
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@ -21,6 +21,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define ENTROPY_EFI
#define TIME_EFI
#define REBOOT_EFI
#define ACPI_NULL
#define DOWNLOAD_PROTO_FILE /* Local filesystem access */

1
src/config/defaults/pcbios.h
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@ -21,6 +21,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define ENTROPY_RTC
#define TIME_RTC
#define REBOOT_PCBIOS
#define ACPI_RSDP
#ifdef __x86_64__
#define IOMAP_PAGES

91
src/core/acpi.c
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@ -57,88 +57,30 @@ void acpi_fix_checksum ( struct acpi_header *acpi ) {
acpi->checksum -= sum;
}
/**
* Locate ACPI root system description table within a memory range
*
* @v start Start address to search
* @v len Length to search
* @ret rsdt ACPI root system description table, or UNULL
*/
static userptr_t acpi_find_rsdt_range ( userptr_t start, size_t len ) {
static const char signature[8] = RSDP_SIGNATURE;
struct acpi_rsdp rsdp;
userptr_t rsdt;
size_t offset;
uint8_t sum;
unsigned int i;
/* Search for RSDP */
for ( offset = 0 ; ( ( offset + sizeof ( rsdp ) ) < len ) ;
offset += RSDP_STRIDE ) {
/* Check signature and checksum */
copy_from_user ( &rsdp, start, offset, sizeof ( rsdp ) );
if ( memcmp ( rsdp.signature, signature,
sizeof ( signature ) ) != 0 )
continue;
for ( sum = 0, i = 0 ; i < sizeof ( rsdp ) ; i++ )
sum += *( ( ( uint8_t * ) &rsdp ) + i );
if ( sum != 0 )
continue;
/* Extract RSDT */
rsdt = phys_to_user ( le32_to_cpu ( rsdp.rsdt ) );
DBGC ( rsdt, "RSDT %#08lx found via RSDP %#08lx\n",
user_to_phys ( rsdt, 0 ),
user_to_phys ( start, offset ) );
return rsdt;
}
return UNULL;
}
/**
* Locate ACPI root system description table
*
* @v ebda Extended BIOS data area, or UNULL
* @ret rsdt ACPI root system description table, or UNULL
*/
userptr_t acpi_find_rsdt ( userptr_t ebda ) {
userptr_t rsdt;
/* Search EBDA, if applicable */
if ( ebda ) {
rsdt = acpi_find_rsdt_range ( ebda, RSDP_EBDA_LEN );
if ( rsdt )
return rsdt;
}
/* Search fixed BIOS area */
rsdt = acpi_find_rsdt_range ( phys_to_user ( RSDP_BIOS_START ),
RSDP_BIOS_LEN );
if ( rsdt )
return rsdt;
return UNULL;
}
/**
* Locate ACPI table
*
* @v rsdt ACPI root system description table
* @v signature Requested table signature
* @v index Requested index of table with this signature
* @ret table Table, or UNULL if not found
*/
userptr_t acpi_find ( userptr_t rsdt, uint32_t signature, unsigned int index ) {
userptr_t acpi_find ( uint32_t signature, unsigned int index ) {
struct acpi_header acpi;
struct acpi_rsdt *rsdtab;
typeof ( rsdtab->entry[0] ) entry;
userptr_t rsdt;
userptr_t table;
size_t len;
unsigned int count;
unsigned int i;
/* Locate RSDT */
rsdt = acpi_find_rsdt();
if ( ! rsdt ) {
DBG ( "RSDT not found\n" );
return UNULL;
}
/* Read RSDT header */
copy_from_user ( &acpi, rsdt, 0, sizeof ( acpi ) );
if ( acpi.signature != cpu_to_le32 ( RSDT_SIGNATURE ) ) {
@ -278,20 +220,27 @@ static int acpi_sx_zsdt ( userptr_t zsdt, uint32_t signature ) {
/**
* Extract \_Sx value from DSDT/SSDT
*
* @v rsdt ACPI root system description table
* @v signature Signature (e.g. "_S5_")
* @ret sx \_Sx value, or negative error
*/
int acpi_sx ( userptr_t rsdt, uint32_t signature ) {
int acpi_sx ( uint32_t signature ) {
struct acpi_fadt fadtab;
userptr_t rsdt;
userptr_t fadt;
userptr_t dsdt;
userptr_t ssdt;
unsigned int i;
int sx;
/* Locate RSDT */
rsdt = acpi_find_rsdt();
if ( ! rsdt ) {
DBG ( "RSDT not found\n" );
return -ENOENT;
}
/* Try DSDT first */
fadt = acpi_find ( rsdt, FADT_SIGNATURE, 0 );
fadt = acpi_find ( FADT_SIGNATURE, 0 );
if ( fadt ) {
copy_from_user ( &fadtab, fadt, 0, sizeof ( fadtab ) );
dsdt = phys_to_user ( fadtab.dsdt );
@ -301,7 +250,7 @@ int acpi_sx ( userptr_t rsdt, uint32_t signature ) {
/* Try all SSDTs */
for ( i = 0 ; ; i++ ) {
ssdt = acpi_find ( rsdt, SSDT_SIGNATURE, i );
ssdt = acpi_find ( SSDT_SIGNATURE, i );
if ( ! ssdt )
break;
if ( ( sx = acpi_sx_zsdt ( ssdt, signature ) ) >= 0 )

3
src/core/null_acpi.c 100644
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@ -0,0 +1,3 @@
#include <ipxe/acpi.h>
PROVIDE_ACPI_INLINE ( null, acpi_find_rsdt );

62
src/include/ipxe/acpi.h
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@ -16,6 +16,8 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/interface.h>
#include <ipxe/uaccess.h>
#include <ipxe/tables.h>
#include <ipxe/api.h>
#include <config/general.h>
/**
* An ACPI description header
@ -89,18 +91,6 @@ struct acpi_rsdp {
uint32_t rsdt;
} __attribute__ (( packed ));
/** EBDA RSDP length */
#define RSDP_EBDA_LEN 0x400
/** Fixed BIOS area RSDP start address */
#define RSDP_BIOS_START 0xe0000
/** Fixed BIOS area RSDP length */
#define RSDP_BIOS_LEN 0x20000
/** Stride at which to search for RSDP */
#define RSDP_STRIDE 16
/** Root System Description Table (RSDT) signature */
#define RSDT_SIGNATURE ACPI_SIGNATURE ( 'R', 'S', 'D', 'T' )
@ -194,16 +184,56 @@ struct acpi_model {
/** Declare an ACPI model */
#define __acpi_model __table_entry ( ACPI_MODELS, 01 )
/**
* Calculate static inline ACPI API function name
*
* @v _prefix Subsystem prefix
* @v _api_func API function
* @ret _subsys_func Subsystem API function
*/
#define ACPI_INLINE( _subsys, _api_func ) \
SINGLE_API_INLINE ( ACPI_PREFIX_ ## _subsys, _api_func )
/**
* Provide an ACPI API implementation
*
* @v _prefix Subsystem prefix
* @v _api_func API function
* @v _func Implementing function
*/
#define PROVIDE_ACPI( _subsys, _api_func, _func ) \
PROVIDE_SINGLE_API ( ACPI_PREFIX_ ## _subsys, _api_func, _func )
/**
* Provide a static inline ACPI API implementation
*
* @v _prefix Subsystem prefix
* @v _api_func API function
*/
#define PROVIDE_ACPI_INLINE( _subsys, _api_func ) \
PROVIDE_SINGLE_API_INLINE ( ACPI_PREFIX_ ## _subsys, _api_func )
/* Include all architecture-independent ACPI API headers */
#include <ipxe/null_acpi.h>
/* Include all architecture-dependent ACPI API headers */
#include <bits/acpi.h>
/**
* Locate ACPI root system description table
*
* @ret rsdt ACPI root system description table, or UNULL
*/
userptr_t acpi_find_rsdt ( void );
extern struct acpi_descriptor *
acpi_describe ( struct interface *interface );
#define acpi_describe_TYPE( object_type ) \
typeof ( struct acpi_descriptor * ( object_type ) )
extern void acpi_fix_checksum ( struct acpi_header *acpi );
extern userptr_t acpi_find_rsdt ( userptr_t ebda );
extern userptr_t acpi_find ( userptr_t rsdt, uint32_t signature,
unsigned int index );
extern int acpi_sx ( userptr_t rsdt, uint32_t signature );
extern userptr_t acpi_find ( uint32_t signature, unsigned int index );
extern int acpi_sx ( uint32_t signature );
extern void acpi_add ( struct acpi_descriptor *desc );
extern void acpi_del ( struct acpi_descriptor *desc );
extern int acpi_install ( int ( * install ) ( struct acpi_header *acpi ) );

23
src/include/ipxe/null_acpi.h 100644
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@ -0,0 +1,23 @@
#ifndef _IPXE_NULL_ACPI_H
#define _IPXE_NULL_ACPI_H
/** @file
*
* Standard do-nothing ACPI interface
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#ifdef ACPI_NULL
#define ACPI_PREFIX_null
#else
#define ACPI_PREFIX_null __null_
#endif
static inline __always_inline userptr_t
ACPI_INLINE ( null, acpi_find_rsdt ) ( void ) {
return UNULL;
}
#endif /* _IPXE_NULL_ACPI_H */