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Lines 15-23
void acpi_reboot(void)
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rr = &acpi_gbl_FADT.reset_register; |
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rr = &acpi_gbl_FADT.reset_register; |
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/* Is the reset register supported? */ |
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/* |
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if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) || |
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* Is the reset register supported? |
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rr->bit_width != 8 || rr->bit_offset != 0) |
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* According to ACPI 3.0 spec the RESET_REG_SUP bit of FADT flag |
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* indicates whether the acpi reboot is supported. On some |
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* boxes this bit is zero. But there exists the definition of |
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* ACPI_RESET_REG & RESET_VALUE. |
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* And on such boxes the system can be rebooted only by using ACPI |
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* reboot after the cycle of suspend/resume. |
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* So in such case it is unnecessary to check the flag bit any more. |
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* When acpi reboot is expected, only the reset_register is checked. |
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* If the following conditions are meeted, it indicates that the reset |
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* register is supported. Otherwise it means that reset register is |
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* unsupported. |
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* a. reset_register is not zero |
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* b. the access width is eight |
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* c. the bit_offset is zero |
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*/ |
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if (!(rr->address) || rr->bit_width != 8 || rr->bit_offset != 0) |
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return; |
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return; |
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reset_value = acpi_gbl_FADT.reset_value; |
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reset_value = acpi_gbl_FADT.reset_value; |