diff options
Diffstat (limited to 'sys/compat/linuxkpi/common/include/linux/highmem.h')
| -rw-r--r-- | sys/compat/linuxkpi/common/include/linux/highmem.h | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/highmem.h b/sys/compat/linuxkpi/common/include/linux/highmem.h index f770bef6b3b7..58a9cdcdf60f 100644 --- a/sys/compat/linuxkpi/common/include/linux/highmem.h +++ b/sys/compat/linuxkpi/common/include/linux/highmem.h @@ -43,6 +43,7 @@ #include <vm/vm_page.h> #include <vm/pmap.h> +#include <linux/mm.h> #include <linux/page.h> #define PageHighMem(p) (0) @@ -78,9 +79,7 @@ kmap_atomic_prot(struct page *page, pgprot_t prot) vm_memattr_t attr = pgprot2cachemode(prot); if (attr != VM_MEMATTR_DEFAULT) { - vm_page_lock(page); page->flags |= PG_FICTITIOUS; - vm_page_unlock(page); pmap_page_set_memattr(page, attr); } return (kmap(page)); @@ -94,6 +93,12 @@ kmap_atomic(struct page *page) } static inline void * +kmap_local_page(struct page *page) +{ + return (kmap(page)); +} + +static inline void * kmap_local_page_prot(struct page *page, pgprot_t prot) { @@ -132,4 +137,34 @@ kunmap_local(void *addr) kunmap_atomic(addr); } +static inline void +memcpy_from_page(char *to, struct page *page, size_t offset, size_t len) +{ + char *from; + + KASSERT(offset + len <= PAGE_SIZE, + ("%s: memcpy from page %p to address %p: " + "offset+len (%zu+%zu) would go beyond page end", + __func__, page, to, offset, len)); + + from = kmap_local_page(page); + memcpy(to, from + offset, len); + kunmap_local(from); +} + +static inline void +memcpy_to_page(struct page *page, size_t offset, const char *from, size_t len) +{ + char *to; + + KASSERT(offset + len <= PAGE_SIZE, + ("%s: memcpy from address %p to page %p: " + "offset+len (%zu+%zu) would go beyond page end", + __func__, from, page, offset, len)); + + to = kmap_local_page(page); + memcpy(to + offset, from, len); + kunmap_local(to); +} + #endif /* _LINUXKPI_LINUX_HIGHMEM_H_ */ |