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/* contains utilities for interacting with virtual memory */
#pragma once
#include <camellia/types.h>
#include <kernel/mem/alloc.h>
#include <stdbool.h>
#include <stddef.h>
struct virt_iter {
void *frag;
size_t frag_len;
size_t prior; // sum of all prior frag_lens
bool error;
void __user *_virt;
size_t _remaining;
struct pagedir *_pages;
bool _user;
bool _writeable;
};
struct virt_cpy_error {
bool read_fail, write_fail;
};
/* if pages == NULL, create an iterator over physical memory. */
void virt_iter_new(
struct virt_iter *iter, void __user *virt, size_t length,
struct pagedir *pages, bool user, bool writeable);
bool virt_iter_next(struct virt_iter *);
size_t virt_cpy(
struct pagedir *dest_pages, void __user *dest,
struct pagedir *src_pages, const void __user *src,
size_t length, struct virt_cpy_error *err);
/* copies to virtual memory, returns true on success */
static inline bool virt_cpy_to(struct pagedir *dest_pages,
void __user *dest, const void *src, size_t length) {
return length == virt_cpy(dest_pages, dest, NULL, (userptr_t)src, length, NULL);
}
/* copies from virtual memory, returns true on success */
static inline bool virt_cpy_from(struct pagedir *src_pages,
void *dest, const void __user *src, size_t length) {
return length == virt_cpy(NULL, (userptr_t)dest, src_pages, src, length, NULL);
}
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