5c7dd7acc3
repo: https://github.com/T-head-Semi/linux commit: b1313fe517ca3703119dcc99ef3bbf75ab42bcfb Change-Id: I6cbb35294024ea3a66140e311f4bb705fd7fd626
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 */
|