29 files changed, 470 insertions, 66 deletions
diff --git a/sys/arch/amd64/boot/apboot.asm b/sys/arch/amd64/boot/apboot.asm
index bd3ad2b..444e480 100644
--- a/sys/arch/amd64/boot/apboot.asm
+++ b/sys/arch/amd64/boot/apboot.asm
@@ -16,15 +16,15 @@
 ;;
 ;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 ;; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 ;; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 ;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 ;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-;; SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 ;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 ;; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 ;; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-;; PKERNSIBILITY OF SUCH DAMAGE.
+;; POSSIBILITY OF SUCH DAMAGE.
 ;;
 
 [bits 16]
diff --git a/sys/arch/amd64/cpu/boot.S b/sys/arch/amd64/cpu/boot.S
index 0cda6a7..737092f 100644
--- a/sys/arch/amd64/cpu/boot.S
+++ b/sys/arch/amd64/cpu/boot.S
@@ -27,6 +27,8 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <md/msr.h>
+
     .text
     .globl _start
     .extern uart_init
@@ -44,6 +46,7 @@ _start:
     lea GDTR(%rip), %rdi    /* Our GDTR */
     call gdt_load           /* Load our GDT */
     call idt_load           /* Load our IDT */
+    call cpu_loinit         /* Initialize processor state */
 
     /*
      * RV7 will default to APIC operation, as per a section
@@ -62,6 +65,31 @@ _start:
     hlt
     jmp 1b
 
+    .globl cpu_loinit
+cpu_loinit:
+    /*
+     * Initialize low-level CPU state
+     */
+    push %r12
+    push %r13
+    push %r14
+    push %r15
+    push %rbx
+    push %rbp
+
+    mov $IA32_EFER, %ecx    /* IA32_EFER */
+    rdmsr                   /* -> EAX */
+    or $1<<11, %eax         /* EFER.NXE */
+    wrmsr                   /* Write it back */
+
+    pop %rbp
+    pop %rbx
+    pop %r15
+    pop %r14
+    pop %r13
+    pop %r12
+    retq
+
     .section .rodata
 bootmsg:
     .ascii "[ preparing since 2025 ]\n"
diff --git a/sys/arch/amd64/cpu/cpu.c b/sys/arch/amd64/cpu/cpu.c
index 9047064..be2bf7d 100644
--- a/sys/arch/amd64/cpu/cpu.c
+++ b/sys/arch/amd64/cpu/cpu.c
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include <sys/types.h>
diff --git a/sys/arch/amd64/cpu/mmu.c b/sys/arch/amd64/cpu/mmu.c
index 65c4e46..ec6d071 100644
--- a/sys/arch/amd64/cpu/mmu.c
+++ b/sys/arch/amd64/cpu/mmu.c
@@ -28,11 +28,15 @@
  */
 
 #include <sys/types.h>
+#include <sys/errno.h>
 #include <sys/cdefs.h>
 #include <kern/panic.h>
 #include <mu/mmu.h>
 #include <vm/vm.h>
+#include <vm/phys.h>
 #include <md/vas.h>
+#include <lib/stdbool.h>
+#include <lib/string.h>
 
 /*
  * See Intel SDM Vol 3A, Section 4.5, Table 4-19
@@ -49,6 +53,143 @@
 #define PTE_GLOBAL      BIT(8)        /* Global / sticky map */
 #define PTE_NX          BIT(63)       /* Execute-disable */
 
+typedef enum {
+    PMAP_PML1,
+    PMAP_PML2,
+    PMAP_PML3,
+    PMAP_PML4
+} pagelevel_t;
+
+/*
+ * Invalidate a single TLB entry
+ */
+static inline void
+pmap_invlpg(uintptr_t pa)
+{
+    __asm(
+        "invlpg (%0)"
+        :
+        : "r" (pa)
+        : "memory"
+    );
+}
+
+/*
+ * Convert protection flags to page table flags
+ */
+static size_t
+pmap_prot_conv(uint16_t prot)
+{
+    size_t pte = PTE_P | PTE_NX;
+
+    if (ISSET(prot, PROT_WRITE))
+        pte |= PTE_RW;
+    if (ISSET(prot, PROT_EXEC))
+        pte &= ~PTE_NX;
+    if (ISSET(prot, PROT_USER))
+        pte |= PTE_US;
+
+    return pte;
+}
+
+/*
+ * Get the index of a pagemap level using a linear
+ * address and the specified desired level
+ */
+static inline size_t
+pmap_get_index(uintptr_t va, pagelevel_t level)
+{
+    switch (level) {
+    case PMAP_PML4:
+        return (va >> 39) & 0x1FF;
+    case PMAP_PML3:
+        return (va >> 30) & 0x1FF;
+    case PMAP_PML2:
+        return (va >> 21) & 0x1FF;
+    case PMAP_PML1:
+        return (va >> 12) & 0x1FF;
+    }
+
+    panic("vm: panic index in %s()\n", __func__);
+}
+
+/*
+ * Perform full or partial linear address translation by virtue
+ * of iterative descent.
+ *
+ * @vas: Virtual address space to target
+ * @va: Virtual address to translate
+ * @en_alloc: If true, allocate new levels if needed
+ * @lvl: Requested level
+ */
+static uintptr_t *
+pmap_get_level(struct mmu_vas *vas, uintptr_t va, bool en_alloc, pagelevel_t lvl)
+{
+    uintptr_t *pmap, phys;
+    uint8_t *tmp;
+    size_t index;
+    pagelevel_t curlvl;
+
+    if (vas == NULL) {
+        return NULL;
+    }
+
+    /* Start here */
+    phys = vas->cr3;
+    pmap = PHYS_TO_VIRT(phys);
+    curlvl = PMAP_PML4;
+
+    /* Start moving down */
+    while ((curlvl--) > lvl) {
+        index = pmap_get_index(va, curlvl);
+        if (ISSET(pmap[index], PTE_P)) {
+            return PHYS_TO_VIRT(pmap[index] & PTE_ADDR_MASK);
+        }
+
+        if (!en_alloc) {
+            return NULL;
+        }
+
+        /* Allocate a new level */
+        phys = vm_phys_alloc(1);
+        if (phys == 0) {
+            return NULL;
+        }
+
+        /* Ensure it is zeroed */
+        tmp = PHYS_TO_VIRT(phys);
+        memset(tmp, 0, 4096);
+
+        pmap[index] = phys | (PTE_P | PTE_RW | PTE_US);
+        pmap = (uintptr_t *)tmp;
+    }
+
+    return pmap;
+}
+
+int
+mu_pmap_map(struct mmu_vas *vas, uintptr_t pa, uintptr_t va,
+    uint16_t prot, pagesize_t ps)
+{
+    uintptr_t *pgtbl;
+    size_t index, pte_flags;
+
+    if (vas == NULL || ps > PMAP_PML4) {
+        return -EINVAL;
+    }
+
+    pgtbl = pmap_get_level(vas, va, true, PMAP_PML1);
+    if (pgtbl == NULL) {
+        return -ENOMEM;
+    }
+
+    index = pmap_get_index(va, PMAP_PML1);
+    pte_flags = pmap_prot_conv(prot);
+    pgtbl[index] = pa | pte_flags;
+    pmap_invlpg(va);
+    return 0;
+}
+
 int
 mu_pmap_readvas(struct mmu_vas *vas)
 {
@@ -59,7 +200,6 @@ mu_pmap_readvas(struct mmu_vas *vas)
         : "memory"
     );
 
-    vas->cr3 &= PTE_ADDR_MASK;
     return 0;
 }
 
@@ -76,6 +216,32 @@ mu_pmap_writevas(struct mmu_vas *vas)
     return 0;
 }
 
+int
+mu_pmap_forkvas(struct mmu_vas *result)
+{
+    struct mmu_vas vas;
+    uintptr_t paddr, *pml4_dest;
+    uintptr_t *pml4_src;
+
+    mu_pmap_readvas(&vas);
+    paddr = vm_phys_alloc(1);
+    if (paddr == 0) {
+        return -ENOMEM;
+    }
+
+    pml4_dest = PHYS_TO_VIRT(paddr);
+    pml4_src = PHYS_TO_VIRT(vas.cr3);
+    for (uint16_t i = 0; i < 512; ++i) {
+        if (i < 256) {
+            pml4_dest[i] = 0;
+        } else {
+            pml4_dest[i] = pml4_src[i];
+        }
+    }
+
+    return 0;
+}
+
 void
 mu_pmap_init(void)
 {
diff --git a/sys/arch/amd64/cpu/mp.c b/sys/arch/amd64/cpu/mp.c
index 866aff1..5ab7815 100644
--- a/sys/arch/amd64/cpu/mp.c
+++ b/sys/arch/amd64/cpu/mp.c
@@ -37,6 +37,8 @@
 #include <dev/clkdev/hpet.h>
 #include <lib/string.h>
 #include <md/lapic.h>
+#include <md/msr.h>
+#include <md/cpu.h>
 #include <mu/cpu.h>
 #include <vm/vm.h>
 #include <vm/phys.h>
@@ -88,10 +90,51 @@ struct ap_bootspace {
     uintptr_t pml1;
 };
 
+/*
+ * A temporary area to save the BSPs MTRRs so they
+ * can be loaded into the APs
+ */
+struct mtrr_save {
+    uintptr_t physbase[256];
+    uintptr_t physmask[256];
+} mtrr_save;
+
 static struct ap_bootspace bs;
 static volatile size_t ap_sync = 0;
 __section(".trampoline") static char ap_code[4096];
 
+static void
+cpu_mtrr_save(void)
+{
+    uint64_t mtrr_cap;
+    uint64_t physbase, physmask;
+    uint8_t mtrr_count;
+
+    mtrr_cap = rdmsr(IA32_MTRR_CAP);
+    mtrr_count = mtrr_cap & 0xFF;
+
+    for (size_t i = 0; i < mtrr_count; ++i) {
+        mtrr_save.physbase[i] = rdmsr(IA32_MTRR_PHYSBASE + (2 * i));
+        mtrr_save.physmask[i] = rdmsr(IA32_MTRR_PHYSMASK + (2 * i));
+    }
+}
+
+static void
+cpu_mtrr_fetch(void)
+{
+    uint64_t mtrr_cap;
+    uint64_t physbase, physmask;
+    uint8_t mtrr_count;
+
+    mtrr_cap = rdmsr(IA32_MTRR_CAP);
+    mtrr_count = mtrr_cap & 0xFF;
+
+    for (size_t i = 0; i < mtrr_count; ++i) {
+        wrmsr(IA32_MTRR_PHYSBASE + (2 * i), mtrr_save.physbase[i]);
+        wrmsr(IA32_MTRR_PHYSMASK + (2 * i), mtrr_save.physmask[i]);
+    }
+}
+
 /*
  * Initialize the boot address space
  */
@@ -177,6 +220,49 @@ cpu_free_bootspace(struct ap_bootspace *bs)
 static void
 cpu_lm_entry(void)
 {
+    /*
+     * Put the processor in no cache fill mode so that we can safely
+     * update MTRRs without worrying about the ground moving under
+     * us...
+     */
+    __asmv(
+        "mov %%cr0, %%rax\n\t"        /* CR0 -> RAX */
+        "or $0x40000000, %%rax\n\t"   /* Set CR0.CD */
+        "mov $0xDFFFFFFF, %%rbx\n\t"  /* ~(1 << 31) -> RBX */
+        "and %%rbx, %%rax\n\t"        /* Unset CR0.NW */
+        "mov %%rax, %%cr0\n\t"        /* Write it back */
+        :
+        :
+        : "rax", "rbx"
+    );
+
+    /* Flush all caches */
+    __asmv(
+        "wbinvd\n\t"                /* Write-back and flush dcache */
+        "mov %%cr3, %%rax\n\t"      /* CR3 -> RAX */
+        "mov %%rax, %%cr3"          /* RAX -> CR3; flush TLB */
+        :
+        :
+        : "memory", "rax"
+    );
+
+    cpu_mtrr_fetch();
+
+    /*
+     * Now we load all the MTRRs given to us by the BSP
+     * before we re-enable normal caching operation
+     */
+    __asmv(
+        "mov %%cr0, %%rax\n\t"          /* CR0 -> RAX */
+        "mov $0xBFFFFFFF, %%rbx\n\t"    /* ~(1 << 30) -> RBX */
+        "and %%rbx, %%rax\n\t"          /* Unset CR0.CD */
+        "mov %%rax, %%cr0\n\t"          /* Write it back */
+        :
+        :
+        : "rax", "rbx"
+    );
+
+    cpu_loinit();
     for (;;) {
         __asmv("cli; hlt");
     }
@@ -271,6 +357,7 @@ cpu_start_aps(struct cpu_info *ci)
 
     /* Initialize the bootspace */
     cpu_init_bootspace(&bs);
+    cpu_mtrr_save();
 
     /* Copy the bring up code to the BUA */
     bua = AP_BUA_VADDR;
diff --git a/sys/arch/amd64/cpu/spinlock.c b/sys/arch/amd64/cpu/spinlock.c
index 8c037a9..1cfa088 100644
--- a/sys/arch/amd64/cpu/spinlock.c
+++ b/sys/arch/amd64/cpu/spinlock.c
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include <sys/cdefs.h>
diff --git a/sys/arch/amd64/os/os_panic.c b/sys/arch/amd64/os/os_panic.c
index d6aa95e..ecad944 100644
--- a/sys/arch/amd64/os/os_panic.c
+++ b/sys/arch/amd64/os/os_panic.c
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include <sys/types.h>
diff --git a/sys/inc/arch/amd64/cpu.h b/sys/inc/arch/amd64/cpu.h
new file mode 100644
index 0000000..67af48b
--- /dev/null
+++ b/sys/inc/arch/amd64/cpu.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_CPU_H_
+#define _MACHINE_CPU_H_ 1
+
+void cpu_loinit(void);
+
+#endif  /* !_MACHINE_CPU_H_ */
diff --git a/sys/inc/arch/amd64/mcb.h b/sys/inc/arch/amd64/mcb.h
index ccd71ce..d48526f 100644
--- a/sys/inc/arch/amd64/mcb.h
+++ b/sys/inc/arch/amd64/mcb.h
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _MACHINE_MCB_H_
diff --git a/sys/inc/arch/amd64/msr.h b/sys/inc/arch/amd64/msr.h
index e3f8887..74566ce 100644
--- a/sys/inc/arch/amd64/msr.h
+++ b/sys/inc/arch/amd64/msr.h
@@ -16,27 +16,35 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _MACHINE_MSR_H_
 #define _MACHINE_MSR_H_ 1
 
+#if !defined(__ASSEMBLER__)
 #include <sys/cdefs.h>
 #include <sys/types.h>
+#endif  /* !__ASSEMBLER__ */
 
 #define IA32_APIC_BASE      0x0000001B
 #define IA32_GS_BASE        0xC0000101
+#define IA32_MTRR_CAP       0x000000FE
+#define IA32_DEF_TYPE       0x000002FF
+#define IA32_MTRR_PHYSBASE  0x00000200
+#define IA32_MTRR_PHYSMASK  0x00000201
 #define IA32_KERNEL_GS_BASE 0xC0000102
+#define IA32_EFER           0xC0000080
 
+#if !defined(__ASSEMBLER__)
 __always_inline static inline uint64_t
 rdmsr(uint32_t msr)
 {
@@ -68,4 +76,5 @@ wrmsr(uint32_t msr, uint64_t val)
     );
 }
 
+#endif  /* !__ASSEMBLER__ */
 #endif  /* !_MACHINE_MSR_H_ */
diff --git a/sys/inc/kern/panic.h b/sys/inc/kern/panic.h
index 59963a3..e1c9254 100644
--- a/sys/inc/kern/panic.h
+++ b/sys/inc/kern/panic.h
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _KE_PANIC_H_
diff --git a/sys/inc/kern/serial.h b/sys/inc/kern/serial.h
index f9be0dc..f6696a1 100644
--- a/sys/inc/kern/serial.h
+++ b/sys/inc/kern/serial.h
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _KERN_SERIAL_H_
diff --git a/sys/inc/mu/cpu.h b/sys/inc/mu/cpu.h
index 141843d..7974cf1 100644
--- a/sys/inc/mu/cpu.h
+++ b/sys/inc/mu/cpu.h
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _MU_CPU_H_
diff --git a/sys/inc/mu/mmu.h b/sys/inc/mu/mmu.h
index ce52376..da2a286 100644
--- a/sys/inc/mu/mmu.h
+++ b/sys/inc/mu/mmu.h
@@ -30,10 +30,31 @@
 #ifndef _MU_PMAP_H_
 #define _MU_PMAP_H_ 1
 
+#include <sys/mman.h>
 #include <sys/types.h>
 #include <sys/cdefs.h>
 #include <md/vas.h>    /* shared */
 
+typedef enum {
+    PAGESIZE_4K,
+} pagesize_t;
+
+/*
+ * Create a virtual to physical mapping of a single
+ * page of memory with a specific page size and specific
+ * protection flags.
+ */
+__strong int mu_pmap_map(
+    struct mmu_vas *vas, uintptr_t pa, uintptr_t va,
+    uint16_t prot, pagesize_t ps
+);
+
+/*
+ * Copy the current VAS leaving the user-side
+ * zeroed
+ */
+__strong int mu_pmap_forkvas(struct mmu_vas *result);
+
 /*
  * Read the currently in-use virtual address space
  * structure
diff --git a/sys/inc/mu/panic.h b/sys/inc/mu/panic.h
index 257c469..310e657 100644
--- a/sys/inc/mu/panic.h
+++ b/sys/inc/mu/panic.h
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _MU_PANIC_H_
diff --git a/sys/inc/mu/spinlock.h b/sys/inc/mu/spinlock.h
index 6795af3..176bbc8 100644
--- a/sys/inc/mu/spinlock.h
+++ b/sys/inc/mu/spinlock.h
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _MU_SPINLOCK_H_
diff --git a/sys/inc/os/mmio.h b/sys/inc/os/mmio.h
index 443db20..09c8d72 100644
--- a/sys/inc/os/mmio.h
+++ b/sys/inc/os/mmio.h
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _OS_MMIO_H_
diff --git a/sys/inc/sys/cdefs.h b/sys/inc/sys/cdefs.h
index cc22322..1da0392 100644
--- a/sys/inc/sys/cdefs.h
+++ b/sys/inc/sys/cdefs.h
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _SYS_CDEFS_H_
diff --git a/sys/inc/sys/mman.h b/sys/inc/sys/mman.h
new file mode 100644
index 0000000..1400a82
--- /dev/null
+++ b/sys/inc/sys/mman.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SYS_MMAN_H_
+#define _SYS_MMAN_H_
+
+#include <sys/param.h>
+
+#define PROT_READ   0x00
+#define PROT_WRITE  BIT(1)
+#define PROT_EXEC   BIT(2)
+#if defined(_KERNEL)
+#define PROT_USER   BIT(3)
+#endif  /* !_KERNEL */
+
+#endif  /* !_SYS_MMAN_H_ */
diff --git a/sys/inc/sys/param.h b/sys/inc/sys/param.h
index 71fca29..96e270e 100644
--- a/sys/inc/sys/param.h
+++ b/sys/inc/sys/param.h
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _SYS_PARAM_H_
diff --git a/sys/inc/sys/types.h b/sys/inc/sys/types.h
index 7c95846..0d476fc 100644
--- a/sys/inc/sys/types.h
+++ b/sys/inc/sys/types.h
@@ -27,7 +27,6 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-
 #ifndef _SYS_TYPES_H_
 #define _SYS_TYPES_H_ 1
 
diff --git a/sys/inc/vm/phys.h b/sys/inc/vm/phys.h
index 93bbf39..50ac2e8 100644
--- a/sys/inc/vm/phys.h
+++ b/sys/inc/vm/phys.h
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _VM_PHYS_H_
diff --git a/sys/inc/vm/vm.h b/sys/inc/vm/vm.h
index ec6e6e7..806ddd1 100644
--- a/sys/inc/vm/vm.h
+++ b/sys/inc/vm/vm.h
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _VM_VM_H_
diff --git a/sys/kern/kern_panic.c b/sys/kern/kern_panic.c
index 1ac9c64..af30e7b 100644
--- a/sys/kern/kern_panic.c
+++ b/sys/kern/kern_panic.c
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include <kern/panic.h>
diff --git a/sys/kern/kern_serial.c b/sys/kern/kern_serial.c
index c4631f2..66dbae0 100644
--- a/sys/kern/kern_serial.c
+++ b/sys/kern/kern_serial.c
@@ -1,4 +1,3 @@
-
 /*
  * Copyright (c) 2025 Ian Marco Moffett and the Osmora Team.
  * All rights reserved.
@@ -17,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include <sys/types.h>
diff --git a/sys/mu/mmu_stub.c b/sys/mu/mmu_stub.c
index d2ab1eb..586edd4 100644
--- a/sys/mu/mmu_stub.c
+++ b/sys/mu/mmu_stub.c
@@ -30,6 +30,24 @@
 #include <sys/cdefs.h>
 #include <mu/mmu.h>
 
+__weak int
+mu_pmap_map(struct mmu_vas *vas, uintptr_t pa, uintptr_t va, uint16_t prot,
+    pagesize_t ps)
+
+{
+    (void)vas;
+    (void)pa;
+    (void)va;
+    (void)prot;
+    (void)ps;
+}
+
+__weak int
+mu_pmap_forkvas(struct mmu_vas *result)
+{
+    (void)result;
+}
+
 __weak void
 mu_pmap_init(void)
 {
diff --git a/sys/vm/vm_hhdm.c b/sys/vm/vm_hhdm.c
index fe1ea84..4de5df9 100644
--- a/sys/vm/vm_hhdm.c
+++ b/sys/vm/vm_hhdm.c
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include <vm/vm.h>
diff --git a/sys/vm/vm_init.c b/sys/vm/vm_init.c
index 8a08671..185ead4 100644
--- a/sys/vm/vm_init.c
+++ b/sys/vm/vm_init.c
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include <sys/types.h>
diff --git a/sys/vm/vm_phys.c b/sys/vm/vm_phys.c
index 717b1f4..6e58284 100644
--- a/sys/vm/vm_phys.c
+++ b/sys/vm/vm_phys.c
@@ -16,15 +16,15 @@
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * PKERNSIBILITY OF SUCH DAMAGE.
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include <sys/types.h>