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iovec: redo iovec_iterator_next_page

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Matheus
2024-09-21 12:57:07 -03:00
parent 15f2cd0cc5
commit 01c883917f
2 changed files with 14 additions and 9 deletions
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kernel-src/include/kernel/iovec.h
+3 -2
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@@ -64,8 +64,9 @@ size_t iovec_iterator_read_from_ringbuffer(iovec_iterator_t *iovec_iterator, rin
size_t iovec_iterator_peek_from_ringbuffer(iovec_iterator_t *iovec_iterator, ringbuffer_t *ringbuffer, size_t byte_count, uintmax_t ringbuffer_offset);
// returns the physical address of the next page in the iovec_iterator, adding a reference count while at it
// fails with EINVAL if the iterator does not currently point to the start of a page or there is not enough space for a page
// sets the page_offset to the offset in the page, page_remaining to the remaining number of bytes in the page and page to the physical address of the page
// if no more pages in iovec_iterator, returns success with page being set to NULL
// fails with EFAULT if the page is not mapped
int iovec_iterator_next_page(iovec_iterator_t *iovec_iterator, void **page);
int iovec_iterator_next_page(iovec_iterator_t *iovec_iterator, size_t *page_offset, size_t *page_remaining, void **page);
#endif
kernel-src/io/iovec.c
+11 -7
View File
@@ -224,19 +224,23 @@ size_t iovec_iterator_read_from_ringbuffer(iovec_iterator_t *iovec_iterator, rin
return done;
}
int iovec_iterator_next_page(iovec_iterator_t *iovec_iterator, void **page) {
int iovec_iterator_next_page(iovec_iterator_t *iovec_iterator, size_t *page_offset, size_t *page_remaining, void **page) {
void *addr = (void *)((uintptr_t)iovec_iterator->current->addr + iovec_iterator->current_offset);
if ((uintptr_t)addr % PAGE_SIZE)
return EINVAL;
size_t offset_in_page = ((uintptr_t)addr % PAGE_SIZE);
size_t remaining = iovec_iterator->current->len - iovec_iterator->current_offset;
if (remaining < PAGE_SIZE)
return EINVAL;
void *phys = vmm_getphysical(addr, true);
if (remaining == 0) {
*page = NULL;
return 0;
}
void *phys = vmm_getphysical((void *)((uintptr_t)addr - offset_in_page), true);
if (phys == NULL)
return EFAULT;
*page_offset = offset_in_page;
*page_remaining = min(PAGE_SIZE, remaining);
*page = phys;
iovec_iterator_skip(iovec_iterator, *page_remaining);
return 0;
}