Commit 689d57bd authored by David S. Miller's avatar David S. Miller

Sparc64: Fix pfn_foo macros and add descriptive commentary

above explaining the {phys,pfn}_base stuff.
parent 531007b8
...@@ -114,11 +114,17 @@ typedef unsigned long iopgprot_t; ...@@ -114,11 +114,17 @@ typedef unsigned long iopgprot_t;
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET) #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET)) #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
/* PFNs are real physical page numbers. However, mem_map only begins to record
* per-page information starting at pfn_base. This is to handle systems where
* the first physical page in the machine is at some huge physical address, such
* as 4GB. This is common on a partitioned E10000, for example.
*/
#define pfn_to_page(pfn) (mem_map + ((pfn)-(pfn_base))) #define pfn_to_page(pfn) (mem_map + ((pfn)-(pfn_base)))
#define page_to_pfn(page) ((unsigned long)(((page) - mem_map) + pfn_base)) #define page_to_pfn(page) ((unsigned long)(((page) - mem_map) + pfn_base))
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr)>>PAGE_SHIFT) #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
#define pfn_valid(pfn) ((pfn) < max_mapnr) #define pfn_valid(pfn) (((pfn)-(pfn_base)) < max_mapnr)
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#define virt_to_phys __pa #define virt_to_phys __pa
......
...@@ -195,10 +195,19 @@ extern unsigned long pfn_base; ...@@ -195,10 +195,19 @@ extern unsigned long pfn_base;
extern struct page *mem_map_zero; extern struct page *mem_map_zero;
#define ZERO_PAGE(vaddr) (mem_map_zero) #define ZERO_PAGE(vaddr) (mem_map_zero)
/* PFNs are real physical page numbers. However, mem_map only begins to record
* per-page information starting at pfn_base. This is to handle systems where
* the first physical page in the machine is at some huge physical address, such
* as 4GB. This is common on a partitioned E10000, for example.
*/
#define pfn_pte(pfn, prot) \ #define pfn_pte(pfn, prot) \
__pte((((pfn)+(pfn_base)) << PAGE_SHIFT) | pgprot_val(prot) | _PAGE_SZBITS) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot) | _PAGE_SZBITS)
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
#define pte_pfn(x) ((pte_val(x) & _PAGE_PADDR)>>PAGE_SHIFT)
#define pte_page(x) pfn_to_page(pte_pfn(x))
#define page_pte_prot(page, prot) mk_pte(page, prot) #define page_pte_prot(page, prot) mk_pte(page, prot)
#define page_pte(page) page_pte_prot(page, __pgprot(0)) #define page_pte(page) page_pte_prot(page, __pgprot(0))
...@@ -246,9 +255,6 @@ extern inline pte_t pte_modify(pte_t orig_pte, pgprot_t new_prot) ...@@ -246,9 +255,6 @@ extern inline pte_t pte_modify(pte_t orig_pte, pgprot_t new_prot)
/* Permanent address of a page. */ /* Permanent address of a page. */
#define __page_address(page) page_address(page) #define __page_address(page) page_address(page)
#define pte_pfn(x) (pte_val(x) & _PAGE_PADDR)
#define pte_page(x) pfn_to_page(pte_pfn(x))
/* Be very careful when you change these three, they are delicate. */ /* Be very careful when you change these three, they are delicate. */
#define pte_mkyoung(pte) (__pte(pte_val(pte) | _PAGE_ACCESSED | _PAGE_R)) #define pte_mkyoung(pte) (__pte(pte_val(pte) | _PAGE_ACCESSED | _PAGE_R))
#define pte_mkwrite(pte) (__pte(pte_val(pte) | _PAGE_WRITE)) #define pte_mkwrite(pte) (__pte(pte_val(pte) | _PAGE_WRITE))
......
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