Josh Holtrop
edba40b2c6
This slowed down drawing to video in QEMU/VirtualBox but greatly sped up doing so on real hardware (no longer reading from video memory). Despite the speed-up, it is still quite slow though.
83 lines
1.9 KiB
D
83 lines
1.9 KiB
D
/**
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* HULK, the HOS Ultra Light Kernel.
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*/
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module hulk.hulk;
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import hulk.header;
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import hulk.fb;
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import hulk.console;
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import hulk.memory;
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import ldc.attributes;
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import hulk.kfont;
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import hulk.klog;
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import hulk.hurl;
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import hulk.hippo;
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import hulk.pci;
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import hulk.gdt;
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import hulk.idt;
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import hulk.cpu;
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import ldc.llvmasm;
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import hulk.pic;
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import hulk.acpi;
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import hulk.apic;
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extern extern(C) __gshared ubyte _hulk_bss_size;
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@(ldc.attributes.section(".hulk_header"))
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private __gshared HulkHeader hulk_header = {
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&_hulk_bss_size, /* hulk_bss_size */
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&hulk_start, /* entry */
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16u * 1024u, /* stack_size */
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HULK_VIRTUAL_BASE_ADDRESS, /* virt_base */
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HULK_VIRTUAL_STACK_TOP_ADDRESS, /* virt_stack_top */
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HULK_VIRTUAL_FRAMEBUFFER_ADDRESS, /* virt_fb_buffer */
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};
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private void initialize_cpu()
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{
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/* Enable SSE. */
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/* Turn off CR0.EM and turn on CR0.MP. */
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write_cr0((read_cr0() & ~CR0_EM) | CR0_MP);
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/* Set CR4.OSFXSR and CR4.OSXMMEXCPT. */
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write_cr4(read_cr4() | CR4_OSFXSR | CR4_OSXMMEXCPT);
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/* Enable OSXSAVE. */
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write_cr4(read_cr4() | CR4_OSXSAVE);
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/* Turn on NXE (no execute enable) flag in the EFER MSR. */
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wrmsr(MSR_EFER, rdmsr(MSR_EFER) | EFER_NXE);
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}
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/**
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* HULK entry point.
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*/
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void hulk_start()
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{
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cli();
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initialize_cpu();
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gdt.initialize();
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idt.initialize();
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fb.initialize(cast(uint *)HULK_VIRTUAL_FRAMEBUFFER_ADDRESS,
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cast(uint *)hulk_header.bootinfo.fb_buffer1_phys,
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hulk_header.bootinfo.fb.width,
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hulk_header.bootinfo.fb.height,
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hulk_header.bootinfo.fb.stride);
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console.initialize();
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console.clear();
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klog.initialize();
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klog.writefln("Welcome to HULK, the HOS UltraLight Kernel!");
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hurl.initialize(&hulk_header);
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pci.initialize();
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pic.initialize();
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acpi.initialize(hulk_header.bootinfo.acpi_xsdt_phys);
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apic.initialize();
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sti();
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for (;;)
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{
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hlt();
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}
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}
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