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sys/boot/i386/libi386/biosacpi.c
| Show First 20 Lines • Show All 54 Lines • ▼ Show 20 Lines | biosacpi_detect(void) | ||||
| ACPI_TABLE_RSDP *rsdp; | ACPI_TABLE_RSDP *rsdp; | ||||
| char buf[24]; | char buf[24]; | ||||
| int revision; | int revision; | ||||
| /* locate and validate the RSDP */ | /* locate and validate the RSDP */ | ||||
| if ((rsdp = biosacpi_find_rsdp()) == NULL) | if ((rsdp = biosacpi_find_rsdp()) == NULL) | ||||
| return; | return; | ||||
| /* export values from the RSDP */ | /* | ||||
| * Report the RSDP to the kernel. While this can be found with | |||||
| * a BIOS boot, the RSDP may be elsewhere when booted from UEFI. | |||||
| * The old code used the 'hints' method to communite this to | |||||
| * the kernel. However, while convenient, the 'hints' method | |||||
| * is fragile and does not work when static hints are compiled | |||||
| * into the kernel. Instead, move to setting different tunables | |||||
| * that start with acpi. The old 'hints' can be removed before | |||||
| * we branch for FreeBSD 12. | |||||
| */ | |||||
| sprintf(buf, "0x%08x", VTOP(rsdp)); | sprintf(buf, "0x%08x", VTOP(rsdp)); | ||||
| setenv("hint.acpi.0.rsdp", buf, 1); | setenv("hint.acpi.0.rsdp", buf, 1); | ||||
| setenv("acpi.rsdp", buf, 1); | |||||
| revision = rsdp->Revision; | revision = rsdp->Revision; | ||||
| if (revision == 0) | if (revision == 0) | ||||
| revision = 1; | revision = 1; | ||||
| sprintf(buf, "%d", revision); | sprintf(buf, "%d", revision); | ||||
| setenv("hint.acpi.0.revision", buf, 1); | setenv("hint.acpi.0.revision", buf, 1); | ||||
| setenv("acpi.revision", buf, 1); | |||||
| strncpy(buf, rsdp->OemId, sizeof(rsdp->OemId)); | strncpy(buf, rsdp->OemId, sizeof(rsdp->OemId)); | ||||
| buf[sizeof(rsdp->OemId)] = '\0'; | buf[sizeof(rsdp->OemId)] = '\0'; | ||||
| setenv("hint.acpi.0.oem", buf, 1); | setenv("hint.acpi.0.oem", buf, 1); | ||||
| setenv("acpi.oem", buf, 1); | |||||
| sprintf(buf, "0x%08x", rsdp->RsdtPhysicalAddress); | sprintf(buf, "0x%08x", rsdp->RsdtPhysicalAddress); | ||||
| setenv("hint.acpi.0.rsdt", buf, 1); | setenv("hint.acpi.0.rsdt", buf, 1); | ||||
| setenv("acpi.rsdt", buf, 1); | |||||
| if (revision >= 2) { | if (revision >= 2) { | ||||
| /* XXX extended checksum? */ | /* XXX extended checksum? */ | ||||
| sprintf(buf, "0x%016llx", rsdp->XsdtPhysicalAddress); | sprintf(buf, "0x%016llx", rsdp->XsdtPhysicalAddress); | ||||
| setenv("hint.acpi.0.xsdt", buf, 1); | setenv("hint.acpi.0.xsdt", buf, 1); | ||||
| setenv("acpi.xsdt", buf, 1); | |||||
| sprintf(buf, "%d", rsdp->Length); | sprintf(buf, "%d", rsdp->Length); | ||||
| setenv("hint.acpi.0.xsdt_length", buf, 1); | setenv("hint.acpi.0.xsdt_length", buf, 1); | ||||
| setenv("acpi.xsdt_length", buf, 1); | |||||
| } | } | ||||
| } | } | ||||
| /* | /* | ||||
| * Find the RSDP in low memory. See section 5.2.2 of the ACPI spec. | * Find the RSDP in low memory. See section 5.2.2 of the ACPI spec. | ||||
| */ | */ | ||||
| static ACPI_TABLE_RSDP * | static ACPI_TABLE_RSDP * | ||||
| biosacpi_find_rsdp(void) | biosacpi_find_rsdp(void) | ||||
| Show All 40 Lines | |||||