diff options
Diffstat (limited to 'src/kernel/mem.c')
| -rw-r--r-- | src/kernel/mem.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/kernel/mem.c b/src/kernel/mem.c index 9ba0231..63f5379 100644 --- a/src/kernel/mem.c +++ b/src/kernel/mem.c @@ -1,5 +1,6 @@ #include <kernel/arch/generic.h> #include <kernel/mem.h> +#include <kernel/util.h> #include <stdint.h> static void *highest_page; @@ -78,3 +79,34 @@ bool virt_iter_next(struct virt_iter *iter) { iter->_virt += partial; return true; } + +bool virt_user_cpy( + struct pagedir *dest_pages, void *dest, + struct pagedir *src_pages, const void *src, size_t length) +{ + struct virt_iter dest_iter, src_iter; + size_t min; + + virt_iter_new(&dest_iter, dest, length, dest_pages, true, true); + virt_iter_new( &src_iter, src, length, src_pages, true, false); + dest_iter.frag_len = 0; + src_iter.frag_len = 0; + + for (;;) { + if (dest_iter.frag_len <= 0) + if (!virt_iter_next(&dest_iter)) break; + if ( src_iter.frag_len <= 0) + if (!virt_iter_next( &src_iter)) break; + + min = src_iter.frag_len < dest_iter.frag_len + ? src_iter.frag_len : dest_iter.frag_len; + memcpy(dest_iter.frag, src_iter.frag, min); + + dest_iter.frag_len -= min; + dest_iter.frag += min; + src_iter.frag_len -= min; + src_iter.frag += min; + } + + return !(dest_iter.error || src_iter.error); +} |