mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 04:02:20 +00:00
e9aab7e4ff
XEN_PFN_PHYS is only used in one place in swiotlb-xen making things more complex than need to be. Remove the definition of XEN_PFN_PHYS and open code the cast in the one place where it is needed. Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20200710223427.6897-8-sstabellini@kernel.org Signed-off-by: Juergen Gross <jgross@suse.com>
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _XEN_PAGE_H
|
|
#define _XEN_PAGE_H
|
|
|
|
#include <asm/page.h>
|
|
|
|
/* The hypercall interface supports only 4KB page */
|
|
#define XEN_PAGE_SHIFT 12
|
|
#define XEN_PAGE_SIZE (_AC(1, UL) << XEN_PAGE_SHIFT)
|
|
#define XEN_PAGE_MASK (~(XEN_PAGE_SIZE-1))
|
|
#define xen_offset_in_page(p) ((unsigned long)(p) & ~XEN_PAGE_MASK)
|
|
|
|
/*
|
|
* We assume that PAGE_SIZE is a multiple of XEN_PAGE_SIZE
|
|
* XXX: Add a BUILD_BUG_ON?
|
|
*/
|
|
|
|
#define xen_pfn_to_page(xen_pfn) \
|
|
(pfn_to_page((unsigned long)(xen_pfn) >> (PAGE_SHIFT - XEN_PAGE_SHIFT)))
|
|
#define page_to_xen_pfn(page) \
|
|
((page_to_pfn(page)) << (PAGE_SHIFT - XEN_PAGE_SHIFT))
|
|
|
|
#define XEN_PFN_PER_PAGE (PAGE_SIZE / XEN_PAGE_SIZE)
|
|
|
|
#define XEN_PFN_DOWN(x) ((x) >> XEN_PAGE_SHIFT)
|
|
#define XEN_PFN_UP(x) (((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT)
|
|
|
|
#include <asm/xen/page.h>
|
|
|
|
/* Return the GFN associated to the first 4KB of the page */
|
|
static inline unsigned long xen_page_to_gfn(struct page *page)
|
|
{
|
|
return pfn_to_gfn(page_to_xen_pfn(page));
|
|
}
|
|
|
|
struct xen_memory_region {
|
|
unsigned long start_pfn;
|
|
unsigned long n_pfns;
|
|
};
|
|
|
|
#define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820_MAX_ENTRIES_ZEROPAGE */
|
|
|
|
extern __initdata
|
|
struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];
|
|
|
|
extern unsigned long xen_released_pages;
|
|
|
|
#endif /* _XEN_PAGE_H */
|