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

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
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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src/core/acpi.c
+20 -71
View File
@@ -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 )
src/core/null_acpi.c
+3
View File
@@ -0,0 +1,3 @@
#include <ipxe/acpi.h>
PROVIDE_ACPI_INLINE ( null, acpi_find_rsdt );