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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/hexagon/include/asm/page.h | |
parent | Initial commit. (diff) | |
download | linux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip |
Adding upstream version 4.19.249.upstream/4.19.249
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/hexagon/include/asm/page.h')
-rw-r--r-- | arch/hexagon/include/asm/page.h | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/page.h b/arch/hexagon/include/asm/page.h new file mode 100644 index 000000000..93f5669b4 --- /dev/null +++ b/arch/hexagon/include/asm/page.h @@ -0,0 +1,163 @@ +/* + * Page management definitions for the Hexagon architecture + * + * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#ifndef _ASM_PAGE_H +#define _ASM_PAGE_H + +#include <linux/const.h> + +/* This is probably not the most graceful way to handle this. */ + +#ifdef CONFIG_PAGE_SIZE_4KB +#define PAGE_SHIFT 12 +#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_4KB +#endif + +#ifdef CONFIG_PAGE_SIZE_16KB +#define PAGE_SHIFT 14 +#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_16KB +#endif + +#ifdef CONFIG_PAGE_SIZE_64KB +#define PAGE_SHIFT 16 +#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_64KB +#endif + +#ifdef CONFIG_PAGE_SIZE_256KB +#define PAGE_SHIFT 18 +#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_256KB +#endif + +#ifdef CONFIG_PAGE_SIZE_1MB +#define PAGE_SHIFT 20 +#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_1MB +#endif + +/* + * These should be defined in hugetlb.h, but apparently not. + * "Huge" for us should be 4MB or 16MB, which are both represented + * in L1 PTE's. Right now, it's set up for 4MB. + */ +#ifdef CONFIG_HUGETLB_PAGE +#define HPAGE_SHIFT 22 +#define HPAGE_SIZE (1UL << HPAGE_SHIFT) +#define HPAGE_MASK (~(HPAGE_SIZE-1)) +#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT) +#define HVM_HUGEPAGE_SIZE 0x5 +#endif + +#define PAGE_SIZE (1UL << PAGE_SHIFT) +#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) + +#ifdef __KERNEL__ +#ifndef __ASSEMBLY__ + +/* + * This is for PFN_DOWN, which mm.h needs. Seems the right place to pull it in. + */ +#include <linux/pfn.h> + +/* + * We implement a two-level architecture-specific page table structure. + * Null intermediate page table level (pmd, pud) definitions will come from + * asm-generic/pagetable-nopmd.h and asm-generic/pagetable-nopud.h + */ +typedef struct { unsigned long pte; } pte_t; +typedef struct { unsigned long pgd; } pgd_t; +typedef struct { unsigned long pgprot; } pgprot_t; +typedef struct page *pgtable_t; + +#define pte_val(x) ((x).pte) +#define pgd_val(x) ((x).pgd) +#define pgprot_val(x) ((x).pgprot) +#define __pte(x) ((pte_t) { (x) }) +#define __pgd(x) ((pgd_t) { (x) }) +#define __pgprot(x) ((pgprot_t) { (x) }) + +/* + * We need a __pa and a __va routine for kernel space. + * MIPS says they're only used during mem_init. + * also, check if we need a PHYS_OFFSET. + */ +#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) +#define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET)) + +/* The "page frame" descriptor is defined in linux/mm.h */ +struct page; + +/* Returns page frame descriptor for virtual address. */ +#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(__pa(kaddr))) + +/* Default vm area behavior is non-executable. */ +#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) + +#define pfn_valid(pfn) ((pfn) < max_mapnr) +#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) + +/* Need to not use a define for linesize; may move this to another file. */ +static inline void clear_page(void *page) +{ + /* This can only be done on pages with L1 WB cache */ + asm volatile( + " loop0(1f,%1);\n" + "1: { dczeroa(%0);\n" + " %0 = add(%0,#32); }:endloop0\n" + : "+r" (page) + : "r" (PAGE_SIZE/32) + : "lc0", "sa0", "memory" + ); +} + +#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) + +/* + * Under assumption that kernel always "sees" user map... + */ +#define clear_user_page(page, vaddr, pg) clear_page(page) +#define copy_user_page(to, from, vaddr, pg) copy_page(to, from) + +/* + * page_to_phys - convert page to physical address + * @page - pointer to page entry in mem_map + */ +#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) + +#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) +#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) + +#define page_to_virt(page) __va(page_to_phys(page)) + +/* + * For port to Hexagon Virtual Machine, MAYBE we check for attempts + * to reference reserved HVM space, but in any case, the VM will be + * protected. + */ +#define kern_addr_valid(addr) (1) + +#include <asm/mem-layout.h> +#include <asm-generic/memory_model.h> +/* XXX Todo: implement assembly-optimized version of getorder. */ +#include <asm-generic/getorder.h> + +#endif /* ifdef __ASSEMBLY__ */ +#endif /* ifdef __KERNEL__ */ + +#endif |