Subversion Repositories HelenOS-historic

Rev

Rev 29 | Rev 33 | Go to most recent revision | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 29 Rev 32
Line 25... Line 25...
25 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 25 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
 */
 27 
 */
28 
 
 28 
 
29 
#include <arch/acpi/acpi.h>
 29 
#include <arch/acpi/acpi.h>
- 
 
 30 
#include <arch/bios/bios.h>
- 
 
 31 
 
- 
 
 32 
#define RSDP_SIGNATURE      "RSD PTR "
- 
 
 33 
#define RSDP_REVISION_OFFS  15
30 
 
 34 
 
31 
struct acpi_rsdp *acpi_rsdp = NULL;
 35 
struct acpi_rsdp *acpi_rsdp = NULL;
32 
 
 36 
 
- 
 
 37 
int rsdp_check(__u8 *rsdp) {
- 
 
 38 
    struct acpi_rsdp *r = (struct acpi_rsdp *) rsdp;
- 
 
 39 
    __u8 sum = 0;
- 
 
 40 
    int i;
- 
 
 41 
   
- 
 
 42 
    for (i=0; i<20; i++)
- 
 
 43 
        sum += rsdp[i];
- 
 
 44 
       
- 
 
 45 
    if (sum)   
- 
 
 46 
        return 0; /* bad checksum */
- 
 
 47 
 
- 
 
 48 
    if (r->revision == 0)
- 
 
 49 
        return 1; /* ACPI 1.0 */
- 
 
 50 
       
- 
 
 51 
    for (; i<r->length; i++)
- 
 
 52 
        sum += rsdp[i];
- 
 
 53 
       
- 
 
 54 
    return !sum;
- 
 
 55 
   
- 
 
 56 
}
- 
 
 57 
 
33 
void acpi_init(void)
 58 
void acpi_init(void)
34 
{
 59 
{
- 
 
 60 
        __u8 *addr[2] = { NULL, (__u8 *) 0xe0000 };
- 
 
 61 
        int i, j, length[2] = { 1024, 128*1024 };
- 
 
 62 
    __u64 *sig = (__u64 *) RSDP_SIGNATURE;
- 
 
 63 
 
- 
 
 64 
        /*
- 
 
 65 
     * Find Root System Description Pointer
- 
 
 66 
         * 1. search first 1K of EBDA
- 
 
 67 
         * 2. search 128K starting at 0xe0000
- 
 
 68 
         */
- 
 
 69 
 
- 
 
 70 
    addr[0] = (__u8 *) ebda;
- 
 
 71 
    for (i = (ebda ? 0 : 1); i < 2; i++) {
- 
 
 72 
                for (j = 0; j < length[i]; j += 16) {
- 
 
 73 
                        if (*((__u64 *) &addr[i][j]) == *sig && rsdp_check(&addr[i][j])) {
- 
 
 74 
                                acpi_rsdp = (struct acpi_rsdp *) &addr[i][j];
- 
 
 75 
                                goto rsdp_found;
- 
 
 76 
                        }
- 
 
 77 
                }
- 
 
 78 
        }
- 
 
 79 
 
- 
 
 80 
        return;
- 
 
 81 
 
- 
 
 82 
rsdp_found:
- 
 
 83 
        printf("%L: ACPI Root System Description Pointer\n", acpi_rsdp);       
35 
}
 84 
}