From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- include/asm-generic/memory_model.h | 57 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 include/asm-generic/memory_model.h (limited to 'include/asm-generic/memory_model.h') diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h new file mode 100644 index 000000000..a2c8ed602 --- /dev/null +++ b/include/asm-generic/memory_model.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_MEMORY_MODEL_H +#define __ASM_MEMORY_MODEL_H + +#include + +#ifndef __ASSEMBLY__ + +/* + * supports 3 memory models. + */ +#if defined(CONFIG_FLATMEM) + +#ifndef ARCH_PFN_OFFSET +#define ARCH_PFN_OFFSET (0UL) +#endif + +#define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) +#define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ + ARCH_PFN_OFFSET) + +#elif defined(CONFIG_SPARSEMEM_VMEMMAP) + +/* memmap is virtually contiguous. */ +#define __pfn_to_page(pfn) (vmemmap + (pfn)) +#define __page_to_pfn(page) (unsigned long)((page) - vmemmap) + +#elif defined(CONFIG_SPARSEMEM) +/* + * Note: section's mem_map is encoded to reflect its start_pfn. + * section[i].section_mem_map == mem_map's address - start_pfn; + */ +#define __page_to_pfn(pg) \ +({ const struct page *__pg = (pg); \ + int __sec = page_to_section(__pg); \ + (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ +}) + +#define __pfn_to_page(pfn) \ +({ unsigned long __pfn = (pfn); \ + struct mem_section *__sec = __pfn_to_section(__pfn); \ + __section_mem_map_addr(__sec) + __pfn; \ +}) +#endif /* CONFIG_FLATMEM/SPARSEMEM */ + +/* + * Convert a physical address to a Page Frame Number and back + */ +#define __phys_to_pfn(paddr) PHYS_PFN(paddr) +#define __pfn_to_phys(pfn) PFN_PHYS(pfn) + +#define page_to_pfn __page_to_pfn +#define pfn_to_page __pfn_to_page + +#endif /* __ASSEMBLY__ */ + +#endif -- cgit v1.2.3