kernel: add header files

include/kernel/pmap.h

@@ -0,0 +1,81 @@
+#ifndef KERNEL_PMAP_H_
+#define KERNEL_PMAP_H_
+
+/* all the functions declared in this file are defined in arch/xyz/pmap.c */
+
+#include <kernel/machine/pmap.h>
+#include <kernel/vm.h>
+#include <mango/status.h>
+#include <stddef.h>
+
+#define PMAP_INVALID ML_PMAP_INVALID
+#define PFN(x)       ((x) >> VM_PAGE_SHIFT)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef ml_pmap_t pmap_t;
+typedef ml_pfn_t pfn_t;
+
+enum pmap_fault_flags {
+	/* if set, the faulting page is present, and the fault is
+	 * protection-related.
+	 * if clear, the faulting page is missing, and the
+	 * fault is due to the missing page.
+	 */
+	PMAP_FAULT_PRESENT = 0x01u,
+	/* if set, the faulting page was accessed from user mode.
+	 * if clear, the faulting page was accessed from kernel mode.
+	 */
+	PMAP_FAULT_USER = 0x02u,
+	/* if set, the fault was caused by a write operation.
+	 * if clear, the faulting page was caused by a read operation.
+	 */
+	PMAP_FAULT_WRITE = 0x04u,
+	/* if set, the fault was caused while fetching an instruction from the
+	 * faulting page.
+	 */
+	PMAP_FAULT_IFETCH = 0x08u,
+	/* if set, the fault was caused by misconfigured page tables */
+	PMAP_FAULT_BADCFG = 0x10u,
+};
+
+enum pmap_flags {
+	PMAP_NORMAL = 0x00u,
+	PMAP_HUGEPAGE = 0x01u,
+};
+
+extern void pmap_bootstrap(void);
+extern pmap_t get_kernel_pmap(void);
+
+extern pmap_t pmap_create(void);
+extern void pmap_destroy(pmap_t pmap);
+extern void pmap_switch(pmap_t pmap);
+
+extern kern_status_t pmap_handle_fault(
+	virt_addr_t fault_addr,
+	enum pmap_fault_flags flags);
+
+extern kern_status_t pmap_add(
+	pmap_t pmap,
+	virt_addr_t p,
+	pfn_t pfn,
+	vm_prot_t prot,
+	enum pmap_flags flags);
+extern kern_status_t pmap_add_block(
+	pmap_t pmap,
+	virt_addr_t p,
+	pfn_t pfn,
+	size_t len,
+	vm_prot_t prot,
+	enum pmap_flags flags);
+
+extern kern_status_t pmap_remove(pmap_t pmap, virt_addr_t p);
+extern kern_status_t pmap_remove_range(pmap_t pmap, virt_addr_t p, size_t len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif