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