Add HURL; relocate kernel virtual regions

src/hello/hello.d

@@ -48,6 +48,21 @@ private ulong hulk_stack_size()
     return hulk_header().stack_size;
 }
 
+private ulong hulk_virt_base_address()
+{
+    return hulk_header().virt_base;
+}
+
+private ulong hulk_virt_stack_top()
+{
+    return hulk_header().virt_stack_top;
+}
+
+private ulong hulk_virt_framebuffer_address()
+{
+    return hulk_header().virt_fb_buffer;
+}
+
 /**
  * Detect if we're running in QEMU.
  */
@@ -326,13 +341,13 @@ private void map2m(ulong source_page, ulong dest_page, PageTableEntry * pt_base)
 private void map_hulk(PageTableEntry * pt_base, ulong bss_phys, ulong stack_phys)
 {
     /* Map HULK bin region. */
-    ulong virt = HULK_VIRTUAL_START;
+    ulong virt = hulk_virt_base_address();
     map4kregion(virt, hulk_bin_phys(), hulk_bin_size(), pt_base);
     /* Map HULK bss region. */
     virt += hulk_bin_size();
     map4kregion(virt, bss_phys, hulk_bss_size(), pt_base);
     /* Map HULK stack. */
-    virt += hulk_bss_size();
+    virt = hulk_virt_stack_top() - hulk_stack_size();
     map4kregion(virt, stack_phys, hulk_stack_size(), pt_base);
 }
 
@@ -352,23 +367,18 @@ private void build_page_tables(ulong max_physical_address, ulong bss_phys, ulong
     /* Map any memory regions that are outside physical RAM. */
     for (size_t i = 0u; i < bootinfo.memory_map_count; i++)
     {
-        if (bootinfo.memory_map[i].base > max_physical_address)
+        ulong addr = bootinfo.memory_map[i].base;
+        if (addr >= max_physical_address)
         {
-            for (size_t offset = 0u; offset < bootinfo.memory_map[i].size; offset += 4096u)
-            {
-                ulong addr = bootinfo.memory_map[i].base + offset;
-                map4k(addr, addr, pt_base);
-            }
+            map4kregion(addr, addr, bootinfo.memory_map[i].size, pt_base);
         }
     }
     /* Map graphics framebuffer. */
     ulong framebuffer_size = bootinfo.fb.height * bootinfo.fb.stride * 4u;
-    for (size_t offset = 0u; offset < framebuffer_size; offset += 4096u)
-    {
-        ulong addr = cast(ulong)bootinfo.fb.buffer + offset;
-        map4k(addr, addr, pt_base);
-    }
-    /* Map HULK to its requested starting virtual address. */
+    ulong fb_phys = cast(ulong)bootinfo.fb.buffer;
+    ulong fb_virt = hulk_virt_framebuffer_address();
+    map4kregion(fb_virt, fb_phys, framebuffer_size, pt_base);
+    /* Map HULK regions. */
     map_hulk(pt_base, bss_phys, stack_phys);
     /* Switch to the new page table. */
     write_cr3(cast(ulong)pt_base);
@@ -377,12 +387,12 @@ private void build_page_tables(ulong max_physical_address, ulong bss_phys, ulong
 /**
  * Jump to HULK entry point.
  */
-private void jump_to_hulk(ulong stack_end)
+private void jump_to_hulk()
 {
     __asm(
             "jmpq *$0",
             "r,{rdi},{rsp}",
-            hulk_header().entry, &bootinfo, stack_end);
+            hulk_header().entry, &bootinfo, hulk_virt_stack_top());
 }
 
 /**
@@ -434,7 +444,7 @@ extern (C) EFI_STATUS efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * st)
     bootinfo.bss_phys = bss_phys;
     bootinfo.stack_phys = stack_phys;
 
-    jump_to_hulk(stack_phys + hulk_stack_size());
+    jump_to_hulk();
 
     return EFI_SUCCESS;
 }

src/hulk/bootinfo.d

@@ -13,7 +13,7 @@ struct BootInfo
      */
     struct Framebuffer
     {
-        /** Framebuffer base address. */
+        /** Framebuffer physical base address. */
         uint * buffer;
         /** Horizontal resolution. */
         uint width;
@@ -68,6 +68,3 @@ struct BootInfo
     /* Physical address of stack while jumping to HULK. */
     ulong stack_phys;
 }
-
-/** HULK base virtual address. */
-enum ulong HULK_VIRTUAL_START = 0x0000_4000_0000_0000u;

src/hulk/header.d

@@ -23,4 +23,13 @@ struct Header
 
     /** Stack size. */
     ulong stack_size;
+
+    /** Virtual base address. */
+    ulong virt_base;
+
+    /** Stack top virtual address. */
+    ulong virt_stack_top;
+
+    /** Framebuffer virtual address. */
+    ulong virt_fb_buffer;
 }

src/hulk/hulk.d

@@ -11,14 +11,18 @@ import hos.memory;
 import ldc.attributes;
 import hulk.kfont;
 import hulk.klog;
+import hulk.hurl;
 
 extern extern(C) __gshared ubyte _hulk_total_size;
 
 @(ldc.attributes.section(".hulk_header"))
 private __gshared Header hulk_header = {
-    &_hulk_total_size,
-    &hulk_start,
-    16u * 1024u,
+    &_hulk_total_size, /* total_size */
+    &hulk_start, /* entry */
+    16u * 1024u, /* stack_size */
+    HULK_VIRTUAL_BASE_ADDRESS, /* virt_base */
+    HULK_VIRTUAL_STACK_TOP_ADDRESS, /* virt_stack_top */
+    HULK_VIRTUAL_FRAMEBUFFER_ADDRESS, /* virt_fb_buffer */
 };
 
 /**
@@ -28,7 +32,7 @@ private __gshared Header hulk_header = {
  */
 void hulk_start(BootInfo * bootinfo)
 {
-    fb.initialize(bootinfo.fb.buffer, bootinfo.fb.width, bootinfo.fb.height, bootinfo.fb.stride);
+    fb.initialize(cast(uint *)HULK_VIRTUAL_FRAMEBUFFER_ADDRESS, bootinfo.fb.width, bootinfo.fb.height, bootinfo.fb.stride);
     console.initialize();
     console.clear();
     klog.initialize();

src/hulk/hulk.ld

@@ -1,6 +1,6 @@
 SECTIONS
 {
-    . = 0x0000400000000000;
+    . = 0xFFFF800000000000;
     _hulk_mem_start = .;
 
     .rodata BLOCK(4K) : ALIGN(4K)

src/hulk/hurl.d

@@ -0,0 +1,15 @@
+/**
+ * HURL, the HOS Unreal Region Locator.
+ *
+ * HURL provides virtual memory management for HULK.
+ */
+module hulk.hurl;
+
+/** HULK virtual base address. */
+enum ulong HULK_VIRTUAL_BASE_ADDRESS = 0xFFFF_8000_0000_0000u;
+
+/** HULK virtual stack top address. */
+enum ulong HULK_VIRTUAL_STACK_TOP_ADDRESS = 0xFFFF_A000_0000_0000u;
+
+/** HULK virtual framebuffer address. */
+enum ulong HULK_VIRTUAL_FRAMEBUFFER_ADDRESS = 0xFFFF_A000_0000_0000u;