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authorMichael Brown2017-05-22 20:27:30 +0200
committerMichael Brown2017-05-23 19:34:39 +0200
commit933e6dadc0b415b26c7c0752423e8284164945e0 (patch)
tree0fe6aaa713b499e59f20fc34d9dde44524d928a9 /src/arch
parent[settings] Extend numerical setting tags to 64 bits (diff)
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[acpi] Make acpi_find_rsdt() a per-platform method
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/arm/include/bits/acpi.h12
-rw-r--r--src/arch/x86/include/bits/acpi.h14
-rw-r--r--src/arch/x86/include/ipxe/rsdp.h18
-rw-r--r--src/arch/x86/interface/pcbios/acpipwr.c18
-rw-r--r--src/arch/x86/interface/pcbios/rsdp.c125
5 files changed, 171 insertions, 16 deletions
diff --git a/src/arch/arm/include/bits/acpi.h b/src/arch/arm/include/bits/acpi.h
new file mode 100644
index 00000000..f9f2f00e
--- /dev/null
+++ b/src/arch/arm/include/bits/acpi.h
@@ -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 */
diff --git a/src/arch/x86/include/bits/acpi.h b/src/arch/x86/include/bits/acpi.h
new file mode 100644
index 00000000..a6ff9080
--- /dev/null
+++ b/src/arch/x86/include/bits/acpi.h
@@ -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 */
diff --git a/src/arch/x86/include/ipxe/rsdp.h b/src/arch/x86/include/ipxe/rsdp.h
new file mode 100644
index 00000000..7e32c001
--- /dev/null
+++ b/src/arch/x86/include/ipxe/rsdp.h
@@ -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 */
diff --git a/src/arch/x86/interface/pcbios/acpipwr.c b/src/arch/x86/interface/pcbios/acpipwr.c
index d19f972d..dc164c7d 100644
--- a/src/arch/x86/interface/pcbios/acpipwr.c
+++ b/src/arch/x86/interface/pcbios/acpipwr.c
@@ -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",
diff --git a/src/arch/x86/interface/pcbios/rsdp.c b/src/arch/x86/interface/pcbios/rsdp.c
new file mode 100644
index 00000000..8da0b558
--- /dev/null
+++ b/src/arch/x86/interface/pcbios/rsdp.c
@@ -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 );