fix(kernel), feat(Timekeeping): Rely on system OVMF firmware for emulation, Rudimentary time zone support

GNUmakefile

@@ -30,23 +30,23 @@ run: run-$(ARCH)
 run-hdd: run-hdd-$(ARCH)
 
 .PHONY: run-x86_64
-run-x86_64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).iso
+run-x86_64: $(IMAGE_NAME).iso
 	qemu-system-$(ARCH) \
 		-M q35 \
-		-drive if=pflash,unit=0,format=raw,file=ovmf/ovmf-code-$(ARCH).fd,readonly=on \
+		-bios /usr/share/ovmf/OVMF.fd \
 		-cdrom $(IMAGE_NAME).iso \
 		$(QEMUFLAGS)
 
 .PHONY: run-hdd-x86_64
-run-hdd-x86_64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).hdd
+run-hdd-x86_64: $(IMAGE_NAME).hdd
 	qemu-system-$(ARCH) \
 		-M q35 \
-		-drive if=pflash,unit=0,format=raw,file=ovmf/ovmf-code-$(ARCH).fd,readonly=on \
+		-bios /usr/share/ovmf/OVMF.fd \
 		-hda $(IMAGE_NAME).hdd \
 		$(QEMUFLAGS)
 
 .PHONY: run-aarch64
-run-aarch64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).iso
+run-aarch64: $(IMAGE_NAME).iso
 	qemu-system-$(ARCH) \
 		-M virt \
 		-cpu cortex-a72 \
@@ -54,12 +54,12 @@ run-aarch64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).iso
 		-device qemu-xhci \
 		-device usb-kbd \
 		-device usb-mouse \
-		-drive if=pflash,unit=0,format=raw,file=ovmf/ovmf-code-$(ARCH).fd,readonly=on \
+		-bios /usr/share/ovmf/OVMF.fd \
 		-cdrom $(IMAGE_NAME).iso \
 		$(QEMUFLAGS)
 
 .PHONY: run-hdd-aarch64
-run-hdd-aarch64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).hdd
+run-hdd-aarch64: $(IMAGE_NAME).hdd
 	qemu-system-$(ARCH) \
 		-M virt \
 		-cpu cortex-a72 \
@@ -67,12 +67,12 @@ run-hdd-aarch64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).hdd
 		-device qemu-xhci \
 		-device usb-kbd \
 		-device usb-mouse \
-		-drive if=pflash,unit=0,format=raw,file=ovmf/ovmf-code-$(ARCH).fd,readonly=on \
+		-bios /usr/share/ovmf/OVMF.fd \
 		-hda $(IMAGE_NAME).hdd \
 		$(QEMUFLAGS)
 
 .PHONY: run-riscv64
-run-riscv64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).iso
+run-riscv64: $(IMAGE_NAME).iso
 	qemu-system-$(ARCH) \
 		-M virt \
 		-cpu rv64 \
@@ -80,12 +80,12 @@ run-riscv64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).iso
 		-device qemu-xhci \
 		-device usb-kbd \
 		-device usb-mouse \
-		-drive if=pflash,unit=0,format=raw,file=ovmf/ovmf-code-$(ARCH).fd,readonly=on \
+		-bios /usr/share/ovmf/OVMF.fd \
 		-cdrom $(IMAGE_NAME).iso \
 		$(QEMUFLAGS)
 
 .PHONY: run-hdd-riscv64
-run-hdd-riscv64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).hdd
+run-hdd-riscv64: $(IMAGE_NAME).hdd
 	qemu-system-$(ARCH) \
 		-M virt \
 		-cpu rv64 \
@@ -93,12 +93,12 @@ run-hdd-riscv64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).hdd
 		-device qemu-xhci \
 		-device usb-kbd \
 		-device usb-mouse \
-		-drive if=pflash,unit=0,format=raw,file=ovmf/ovmf-code-$(ARCH).fd,readonly=on \
+		-bios /usr/share/ovmf/OVMF.fd \
 		-hda $(IMAGE_NAME).hdd \
 		$(QEMUFLAGS)
 
 .PHONY: run-loongarch64
-run-loongarch64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).iso
+run-loongarch64: $(IMAGE_NAME).iso
 	qemu-system-$(ARCH) \
 		-M virt \
 		-cpu la464 \
@@ -106,12 +106,12 @@ run-loongarch64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).iso
 		-device qemu-xhci \
 		-device usb-kbd \
 		-device usb-mouse \
-		-drive if=pflash,unit=0,format=raw,file=ovmf/ovmf-code-$(ARCH).fd,readonly=on \
+		-bios /usr/share/ovmf/OVMF.fd \
 		-cdrom $(IMAGE_NAME).iso \
 		$(QEMUFLAGS)
 
 .PHONY: run-hdd-loongarch64
-run-hdd-loongarch64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).hdd
+run-hdd-loongarch64: $(IMAGE_NAME).hdd
 	qemu-system-$(ARCH) \
 		-M virt \
 		-cpu la464 \
@@ -119,7 +119,7 @@ run-hdd-loongarch64: ovmf/ovmf-code-$(ARCH).fd $(IMAGE_NAME).hdd
 		-device qemu-xhci \
 		-device usb-kbd \
 		-device usb-mouse \
-		-drive if=pflash,unit=0,format=raw,file=ovmf/ovmf-code-$(ARCH).fd,readonly=on \
+		-bios /usr/share/ovmf/OVMF.fd \
 		-hda $(IMAGE_NAME).hdd \
 		$(QEMUFLAGS)
 
@@ -139,14 +139,6 @@ run-hdd-bios: $(IMAGE_NAME).hdd
 		-hda $(IMAGE_NAME).hdd \
 		$(QEMUFLAGS)
 
-ovmf/ovmf-code-$(ARCH).fd:
-	mkdir -p ovmf
-	curl -Lo $@ https://github.com/osdev0/edk2-ovmf-nightly/releases/latest/download/ovmf-code-$(ARCH).fd
-	case "$(ARCH)" in \
-		aarch64) dd if=/dev/zero of=$@ bs=1 count=0 seek=67108864 2>/dev/null;; \
-		riscv64) dd if=/dev/zero of=$@ bs=1 count=0 seek=33554432 2>/dev/null;; \
-	esac
-
 limine/limine:
 	rm -rf limine
 	git clone https://github.com/limine-bootloader/limine.git --branch=v9.x-binary --depth=1

kernel/src/Timekeeping/Time.cpp

@@ -10,6 +10,29 @@
 using namespace Kt;
 
 void Timekeeping::Init(uint16_t Year, uint8_t Month, uint8_t Day, uint8_t Hour, uint8_t Minute, uint8_t Second) {
+    /* Hardcode CET for now */
+    TimeZone CET = {
+        "Central European Time",
+        "CET",
+        1, /* UTC+1 */
+        0,
+        false
+    };
+
+    Kt::KernelLogStream(INFO, "Timekeeping Service") << "Setting time zone to " << CET.TZLongName << " (" << CET.TZShortName << ")";
+
+    Minute = Minute + CET.MinuteOffset;
+    Hour = Hour + CET.HourOffset;
+    if (Minute >= 60) {
+        Minute -= 60;
+        Hour += 1;
+    }
+    if (Hour >= 24) {
+        Hour -= 24;
+        Day += 1;
+        /* Note: No month/day overflow handling yet */
+    }
+
     kcp::cstringstream minuteStream;
     if (Minute < 10) {
         minuteStream << "0";
@@ -33,7 +56,8 @@ void Timekeeping::Init(uint16_t Year, uint8_t Month, uint8_t Day, uint8_t Hour,
         << Hour << ":"
 
         << minuteStr << ":"
-        << secondStr;
+        << secondStr
+        << " (" << CET.TZLongName << ")";
 
 
     CString dateString = panelStr.c_str();

kernel/src/Timekeeping/Time.hpp

@@ -7,6 +7,24 @@
 #include <CppLib/CString.hpp>
 
 namespace Timekeeping {
+    /*
+        Structure representing the attributes of a time zone; properties and time zone configuration will eventually
+        be loaded from disk/ramdisk.
+    */
+    struct TimeZone {
+        /* Time zone naming scheme: 
+            i.e. "Central European Time" / "CET"
+        */
+        CString TZLongName;
+        CString TZShortName;
+        /* Hour offset from UTC */
+        int8_t HourOffset;
+        /* Minute offset from UTC */
+        int8_t MinuteOffset;
+        /* Is daylight saving time */
+        bool IsDST;
+    };
+    
     const CString Months[] = {
         nullptr,
         "January",