diff options
Diffstat (limited to 'src/arch/x86/interface/pcbios/rsdp.c')
| -rw-r--r-- | src/arch/x86/interface/pcbios/rsdp.c | 42 |
1 files changed, 22 insertions, 20 deletions
diff --git a/src/arch/x86/interface/pcbios/rsdp.c b/src/arch/x86/interface/pcbios/rsdp.c index 3c67b7525..6913be552 100644 --- a/src/arch/x86/interface/pcbios/rsdp.c +++ b/src/arch/x86/interface/pcbios/rsdp.c @@ -31,6 +31,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); */ #include <stdint.h> +#include <string.h> #include <realmode.h> #include <bios.h> #include <ipxe/acpi.h> @@ -53,50 +54,51 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); * * @v start Start address to search * @v len Length to search - * @ret rsdt ACPI root system description table, or UNULL + * @ret rsdt ACPI root system description table, or NULL */ -static userptr_t rsdp_find_rsdt_range ( userptr_t start, size_t len ) { +static const struct acpi_rsdt * rsdp_find_rsdt_range ( const void *start, + size_t len ) { static const char signature[8] = RSDP_SIGNATURE; - struct acpi_rsdp rsdp; - userptr_t rsdt; + const struct acpi_rsdp *rsdp; + const struct acpi_rsdt *rsdt; size_t offset; uint8_t sum; unsigned int i; /* Search for RSDP */ - for ( offset = 0 ; ( ( offset + sizeof ( rsdp ) ) < len ) ; + 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, + rsdp = ( start + offset ); + if ( memcmp ( rsdp->signature, signature, sizeof ( signature ) ) != 0 ) continue; - for ( sum = 0, i = 0 ; i < sizeof ( rsdp ) ; i++ ) - sum += *( ( ( uint8_t * ) &rsdp ) + i ); + 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 ) ); + rsdt = phys_to_virt ( le32_to_cpu ( rsdp->rsdt ) ); DBGC ( rsdt, "RSDT %#08lx found via RSDP %#08lx\n", - user_to_phys ( rsdt, 0 ), - user_to_phys ( start, offset ) ); + virt_to_phys ( rsdt ), + ( virt_to_phys ( start ) + offset ) ); return rsdt; } - return UNULL; + return NULL; } /** * Locate ACPI root system description table * - * @ret rsdt ACPI root system description table, or UNULL + * @ret rsdt ACPI root system description table, or NULL */ -static userptr_t rsdp_find_rsdt ( void ) { - static userptr_t rsdt; +static const struct acpi_rsdt * rsdp_find_rsdt ( void ) { + static const struct acpi_rsdt *rsdt; + const void *ebda; uint16_t ebda_seg; - userptr_t ebda; size_t ebda_len; /* Return existing RSDT if already found */ @@ -106,7 +108,7 @@ static userptr_t rsdp_find_rsdt ( void ) { /* 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 = real_to_virt ( ebda_seg, 0 ); ebda_len = ( ( RSDP_EBDA_END_SEG - ebda_seg ) * 16 ); rsdt = rsdp_find_rsdt_range ( ebda, ebda_len ); if ( rsdt ) @@ -114,12 +116,12 @@ static userptr_t rsdp_find_rsdt ( void ) { } /* Search fixed BIOS area */ - rsdt = rsdp_find_rsdt_range ( phys_to_user ( RSDP_BIOS_START ), + rsdt = rsdp_find_rsdt_range ( phys_to_virt ( RSDP_BIOS_START ), RSDP_BIOS_LEN ); if ( rsdt ) return rsdt; - return UNULL; + return NULL; } PROVIDE_ACPI ( rsdp, acpi_find_rsdt, rsdp_find_rsdt ); |