Kernel: Call ACPI reboot method first if possible

Now we call ACPI reboot method first if possible, and if ACPI reboot is
not available, we attempt to reboot via the keyboard controller.

Kernel/ACPI/ACPIDynamicParser.cpp

@@ -82,7 +82,7 @@ namespace ACPI {
         // FIXME: Implement AML Interpretation
         ASSERT_NOT_REACHED();
     }
-    void DynamicParser::do_acpi_shutdown()
+    void DynamicParser::try_acpi_shutdown()
     {
         // FIXME: Implement AML Interpretation to perform ACPI shutdown
         ASSERT_NOT_REACHED();

Kernel/ACPI/ACPIDynamicParser.h

@@ -44,8 +44,9 @@ public:
     virtual void enable_aml_interpretation() override;
     virtual void enable_aml_interpretation(File& dsdt_file) override;
     virtual void enable_aml_interpretation(u8* physical_dsdt, u32 dsdt_payload_legnth) override;
-    virtual void disable_aml_interpretation() override;
+    virtual void disable_aml_interpretation() override;    
-    virtual void do_acpi_shutdown() override;
+    virtual void try_acpi_shutdown() override;
+    virtual bool can_shutdown() override { return true; }
 
 protected:
     DynamicParser();

Kernel/ACPI/ACPIParser.cpp

@@ -64,16 +64,14 @@ namespace ACPI {
         return {};
     }
 
-    void Parser::do_acpi_reboot()
+    void Parser::try_acpi_reboot()
     {
         klog() << "ACPI: Cannot invoke reboot!";
-        ASSERT_NOT_REACHED();
     }
 
-    void Parser::do_acpi_shutdown()
+    void Parser::try_acpi_shutdown()
     {
         klog() << "ACPI: Cannot invoke shutdown!";
-        ASSERT_NOT_REACHED();
     }
 
     void Parser::enable_aml_interpretation()

Kernel/ACPI/ACPIParser.h

@@ -43,8 +43,10 @@ public:
     static void initialize_limited();
     virtual PhysicalAddress find_table(const char* sig);
 
-    virtual void do_acpi_reboot();
+    virtual void try_acpi_reboot();
-    virtual void do_acpi_shutdown();
+    virtual bool can_reboot() { return false; }
+    virtual void try_acpi_shutdown();
+    virtual bool can_shutdown() { return false; }
 
     virtual void enable_aml_interpretation();
     virtual void enable_aml_interpretation(File&);

Kernel/ACPI/ACPIStaticParser.cpp

@@ -102,28 +102,33 @@ namespace ACPI {
         klog() << "ACPI: Fixed ACPI data, Revision " << sdt->revision << ", Length " << sdt->length << " bytes";
     }
 
-    void StaticParser::do_acpi_reboot()
+    bool StaticParser::can_reboot()
+    {
+        // FIXME: Determine if we need to do MMIO/PCI/IO access to reboot, according to ACPI spec 6.2, Section 4.8.3.6
+        auto region = MM.allocate_kernel_region(m_fadt.page_base(), (PAGE_SIZE * 2), "ACPI Static Parser", Region::Access::Read);
+        auto* fadt = (const Structures::FADT*)region->vaddr().offset(m_fadt.offset_in_page().get()).as_ptr();
+        return fadt->h.revision >= 2;
+    }
+
+    void StaticParser::try_acpi_reboot()
     {
         // FIXME: Determine if we need to do MMIO/PCI/IO access to reboot, according to ACPI spec 6.2, Section 4.8.3.6
 #ifdef ACPI_DEBUG
-        dbg() << "ACPI: Rebooting, Probing FADT (P @ " << m_fadt.ptr() << ")";
+        dbg() << "ACPI: Rebooting, Probing FADT (" << m_fadt << ")";
 #endif
+
         auto region = MM.allocate_kernel_region(m_fadt.page_base(), (PAGE_SIZE * 2), "ACPI Static Parser", Region::Access::Read);
         auto* fadt = (const Structures::FADT*)region->vaddr().offset(m_fadt.offset_in_page().get()).as_ptr();
         if (fadt->h.revision >= 2) {
             klog() << "ACPI: Reboot, Sending value 0x" << String::format("%x", fadt->reset_value) << " to Port 0x" << String::format("%x", fadt->reset_reg.address);
             IO::out8(fadt->reset_reg.address, fadt->reset_value);
-        } else {
-            klog() << "ACPI: Reboot, Not supported!";
         }
-
+        klog() << "ACPI: Reboot, Not supported!";
-        ASSERT_NOT_REACHED(); /// If rebooting didn't work, halt.
     }
 
-    void StaticParser::do_acpi_shutdown()
+    void StaticParser::try_acpi_shutdown()
     {
         klog() << "ACPI: Shutdown is not supported with the current configuration, Abort!";
-        ASSERT_NOT_REACHED();
     }
 
     size_t StaticParser::get_table_size(PhysicalAddress table_header)

Kernel/ACPI/ACPIStaticParser.h

@@ -39,8 +39,10 @@ namespace ACPI {
         static bool is_initialized();
 
         virtual PhysicalAddress find_table(const char* sig) override;
-        virtual void do_acpi_reboot() override;
+        virtual void try_acpi_reboot() override;
-        virtual void do_acpi_shutdown() override;
+        virtual bool can_reboot() override;
+        virtual bool can_shutdown() override { return false; }
+        virtual void try_acpi_shutdown() override;
         virtual bool is_operable() override { return m_operable; }
 
     protected:

Kernel/Process.cpp

@@ -31,6 +31,7 @@
 #include <AK/StringBuilder.h>
 #include <AK/Time.h>
 #include <AK/Types.h>
+#include <Kernel/ACPI/ACPIParser.h>
 #include <Kernel/Arch/i386/CPU.h>
 #include <Kernel/Devices/BlockDevice.h>
 #include <Kernel/Devices/KeyboardDevice.h>
@@ -3990,6 +3991,10 @@ int Process::sys$reboot()
     FS::lock_all();
     dbg() << "syncing mounted filesystems...";
     FS::sync();
+    if (ACPI::Parser::the().can_reboot()) {
+        dbg() << "attempting reboot via ACPI";
+        ACPI::Parser::the().try_acpi_reboot();
+    }
     dbg() << "attempting reboot via KB Controller...";
     IO::out8(0x64, 0xFE);