test

2026-07-20 01:53:04 +02:00
commit e71245c082
149 changed files with 8571 additions and 0 deletions
@@ -0,0 +1,56 @@
+#include <zinnia/pmap.h>
+#include <zinnia/types.h>
+
+enum : pte_t {
+    ARCH_FLAG_PRESENT = 1 << 0,
+    ARCH_FLAG_READ_WRITE = 1 << 1,
+    ARCH_FLAG_USER_MODE = 1 << 2,
+    ARCH_FLAG_WRITE_THROUGH = 1 << 3,
+    ARCH_FLAG_CACHE_DISABLE = 1 << 4,
+    ARCH_FLAG_ACCESSED = 1 << 5,
+    ARCH_FLAG_DIRTY = 1 << 6,
+    ARCH_FLAG_SIZE = 1 << 7,
+    ARCH_FLAG_GLOBAL = 1 << 8,
+    ARCH_FLAG_AVAILABLE = 1 << 9,
+    ARCH_FLAG_ATTRIBUTE_TABLE = 1 << 10,
+    ARCH_FLAG_EXECUTE_DISABLE = 1LU << 63,
+
+    ARCH_PTE_ADDR_MASK = 0x000F'FFFF'FFFF'F000,
+};
+
+void pte_clear(pte_t* pte) {
+    *pte = 0;
+}
+
+pte_t pte_build(phys_t addr, enum pte_flags flags, enum cache_mode cache) {
+    pte_t result = ((pte_t)addr & ARCH_PTE_ADDR_MASK) | ARCH_FLAG_PRESENT;
+
+    if (flags & PTE_USER)
+        result |= ARCH_FLAG_USER_MODE;
+
+    if (flags & PTE_DIR)
+        result |= ARCH_FLAG_READ_WRITE;
+    else {
+        if (flags & PTE_WRITE)
+            result |= ARCH_FLAG_READ_WRITE;
+        if (!(flags & PTE_EXEC))
+            result |= ARCH_FLAG_EXECUTE_DISABLE;
+    }
+    return result;
+}
+
+bool pte_is_present(pte_t* pte) {
+    return *pte & ARCH_FLAG_PRESENT;
+}
+
+bool pte_is_dir(pte_t* pte) {
+    return *pte & ARCH_FLAG_SIZE;
+}
+
+phys_t pte_address(pte_t* pte) {
+    return (phys_t)(*pte & ARCH_PTE_ADDR_MASK);
+}
+
+void pmap_set(struct pmap* pt) {
+    asm volatile("mov cr3, %0" ::"r"(pt->root) : "memory");
+}