From de8ecf4c590e998eedbc2ebd508daeb29e1a63f7 Mon Sep 17 00:00:00 2001 From: Ivan Baravy Date: Mon, 2 Mar 2020 21:48:09 +0000 Subject: [PATCH] kernel: Implement reboot via fixed Reset register in FADT table if available. The code expects the register is in system_io space. Other options are not implemented but it works on my computer (c). git-svn-id: svn://kolibrios.org@7734 a494cfbc-eb01-0410-851d-a64ba20cac60 --- kernel/trunk/boot/shutdown.inc | 45 ++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/kernel/trunk/boot/shutdown.inc b/kernel/trunk/boot/shutdown.inc index c8e38707bb..45a94b3661 100644 --- a/kernel/trunk/boot/shutdown.inc +++ b/kernel/trunk/boot/shutdown.inc @@ -13,6 +13,27 @@ $Revision$ +; ACPI Generic Address Structure +struct GAS + asid db ? ; address space id + bit_width db ? + bit_offset db ? + access_size db ? + address DQ ? +ends + +ASID.SYSTEM_MEMORY = 0 +ASID.SYSTEM_IO = 1 +ASID.PCI_CONFIG = 2 +ASID.PCI_EC = 3 +ASID.PCI_SMBUS = 4 + +ACCESS_SIZE.UNDEFINED = 0 +ACCESS_SIZE.BYTE = 1 +ACCESS_SIZE.WORD = 2 +ACCESS_SIZE.DWORD = 3 +ACCESS_SIZE.QWORD = 4 + align 4 system_shutdown: ; shut down the system @@ -173,6 +194,30 @@ do_acpi_power_off: jmp $ no_acpi_power_off: + cmp byte[BOOT_LO.shutdown_type], SYSTEM_REBOOT + jnz no_acpi_reboot + ; try to reboot via ACPI fixed features + mov ebx, [acpi_fadt_base-OS_BASE] + cmp dword[ebx], 'FACP' + jne no_acpi_power_off + test dword[ebx+0x70], 1 SHL 10 ; RESET_REG_SUP + jz no_acpi_reboot + cmp [ebx+0x74+GAS.asid], ASID.SYSTEM_IO + jnz no_acpi_reboot + cmp [ebx+0x74+GAS.bit_width], 8 + jnz no_acpi_reboot + cmp [ebx+0x74+GAS.bit_offset], 0 + jnz no_acpi_reboot + cmp [ebx+0x74+GAS.access_size], ACCESS_SIZE.BYTE + ja no_acpi_reboot + cmp [ebx+0x74+GAS.address.hi], 0 + jnz no_acpi_reboot + mov edx, [ebx+0x74+GAS.address.lo] + movzx eax, byte[ebx+0x80] + out dx, al + jmp $ + ; unreachable +no_acpi_reboot: jmp 0x50000 align 4