[ARM] nommu: adjust headers for !MMU ARM systems
Majorily based on Hyok Choi's patches, this fixes up the asm-arm header files for mmuless systems. Over and above Hyok's patches: - nommu.h merged into mmu.h (it's only a structure) - nommu_context.h is essentially the same as mmu_context.h, but without the MM switching code. so there's no point having separate files. Also, in memory.h, there's no point #ifndef'ing PHYS_OFFSET and END_MEM - both CONFIG_DRAM_BASE and CONFIG_DRAM_SIZE will always be set by the configuration scripts. Other files have minor formatting changes, but are essentially the same. Hyok's original patches were signed off thusly: Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>hifive-unleashed-5.1
Russell King
Russell King
parent
60b6cf6851
commit
002547b4f8
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@ -10,8 +10,12 @@
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#ifndef __ASM_BUGS_H
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#define __ASM_BUGS_H
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#ifdef CONFIG_MMU
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extern void check_writebuffer_bugs(void);
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#define check_bugs() check_writebuffer_bugs()
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#else
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#define check_bugs() do { } while (0)
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#endif
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#endif
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@ -50,6 +50,8 @@
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#define domain_val(dom,type) ((type) << (2*(dom)))
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_MMU
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#define set_domain(x) \
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do { \
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__asm__ __volatile__( \
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@ -66,5 +68,10 @@
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set_domain(thread->cpu_domain); \
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} while (0)
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#else
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#define set_domain(x) do { } while (0)
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#define modify_domain(dom,type) do { } while (0)
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#endif
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#endif
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#endif /* !__ASSEMBLY__ */
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@ -2,6 +2,7 @@
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* linux/include/asm-arm/memory.h
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*
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* Copyright (C) 2000-2002 Russell King
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* modification for nommu, Hyok S. Choi, 2004
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -26,6 +27,8 @@
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#include <asm/arch/memory.h>
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#include <asm/sizes.h>
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#ifdef CONFIG_MMU
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#ifndef TASK_SIZE
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/*
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* TASK_SIZE - the maximum size of a user space task.
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@ -47,6 +50,60 @@
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#define PAGE_OFFSET UL(0xc0000000)
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#endif
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/*
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* The module space lives between the addresses given by TASK_SIZE
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* and PAGE_OFFSET - it must be within 32MB of the kernel text.
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*/
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#define MODULE_END (PAGE_OFFSET)
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#define MODULE_START (MODULE_END - 16*1048576)
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#if TASK_SIZE > MODULE_START
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#error Top of user space clashes with start of module space
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#endif
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/*
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* The XIP kernel gets mapped at the bottom of the module vm area.
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* Since we use sections to map it, this macro replaces the physical address
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* with its virtual address while keeping offset from the base section.
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*/
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#define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff))
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#else /* CONFIG_MMU */
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/*
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* The limitation of user task size can grow up to the end of free ram region.
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* It is difficult to define and perhaps will never meet the original meaning
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* of this define that was meant to.
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* Fortunately, there is no reference for this in noMMU mode, for now.
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*/
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#ifndef TASK_SIZE
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#define TASK_SIZE (CONFIG_DRAM_SIZE)
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#endif
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#ifndef TASK_UNMAPPED_BASE
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#define TASK_UNMAPPED_BASE UL(0x00000000)
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#endif
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#ifndef PHYS_OFFSET
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#define PHYS_OFFSET (CONFIG_DRAM_BASE)
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#endif
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#ifndef END_MEM
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#define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
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#endif
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#ifndef PAGE_OFFSET
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#define PAGE_OFFSET (PHYS_OFFSET)
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#endif
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/*
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* The module can be at any place in ram in nommu mode.
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*/
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#define MODULE_END (END_MEM)
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#define MODULE_START (PHYS_OFFSET)
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#endif /* !CONFIG_MMU */
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/*
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* Size of DMA-consistent memory region. Must be multiple of 2M,
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* between 2MB and 14MB inclusive.
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@ -71,24 +128,6 @@
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#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
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#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
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/*
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* The module space lives between the addresses given by TASK_SIZE
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* and PAGE_OFFSET - it must be within 32MB of the kernel text.
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*/
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#define MODULE_END (PAGE_OFFSET)
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#define MODULE_START (MODULE_END - 16*1048576)
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#if TASK_SIZE > MODULE_START
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#error Top of user space clashes with start of module space
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#endif
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/*
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* The XIP kernel gets mapped at the bottom of the module vm area.
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* Since we use sections to map it, this macro replaces the physical address
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* with its virtual address while keeping offset from the base section.
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*/
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#define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff))
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#ifndef __ASSEMBLY__
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/*
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@ -1,6 +1,8 @@
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#ifndef __ARM_MMU_H
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#define __ARM_MMU_H
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#ifdef CONFIG_MMU
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typedef struct {
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#if __LINUX_ARM_ARCH__ >= 6
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unsigned int id;
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@ -13,4 +15,18 @@ typedef struct {
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#define ASID(mm) (0)
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#endif
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#else
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/*
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* From nommu.h:
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* Copyright (C) 2002, David McCullough <davidm@snapgear.com>
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* modified for 2.6 by Hyok S. Choi <hyok.choi@samsung.com>
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*/
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typedef struct {
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struct vm_list_struct *vmlist;
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unsigned long end_brk;
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} mm_context_t;
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#endif
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#endif
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@ -82,6 +82,7 @@ static inline void
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switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk)
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{
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#ifdef CONFIG_MMU
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unsigned int cpu = smp_processor_id();
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if (prev != next) {
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@ -91,6 +92,7 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
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if (cache_is_vivt())
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cpu_clear(cpu, prev->cpu_vm_mask);
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}
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#endif
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}
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#define deactivate_mm(tsk,mm) do { } while (0)
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@ -0,0 +1,51 @@
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/*
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* linux/include/asm-arm/page-nommu.h
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*
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* Copyright (C) 2004 Hyok S. Choi
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASMARM_PAGE_NOMMU_H
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#define _ASMARM_PAGE_NOMMU_H
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#if !defined(CONFIG_SMALL_TASKS) && PAGE_SHIFT < 13
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#define KTHREAD_SIZE (8192)
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#else
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#define KTHREAD_SIZE PAGE_SIZE
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#endif
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#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
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#define free_user_page(page, addr) free_page(addr)
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#define clear_page(page) memset((page), 0, PAGE_SIZE)
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#define copy_page(to,from) memcpy((to), (from), PAGE_SIZE)
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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/*
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* These are used to make use of C type-checking..
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*/
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typedef unsigned long pte_t;
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typedef unsigned long pmd_t;
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typedef unsigned long pgd_t[2];
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typedef unsigned long pgprot_t;
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#define pte_val(x) (x)
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#define pmd_val(x) (x)
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#define pgd_val(x) ((x)[0])
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#define pgprot_val(x) (x)
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#define __pte(x) (x)
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#define __pmd(x) (x)
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#define __pgprot(x) (x)
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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extern unsigned long memory_start;
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extern unsigned long memory_end;
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#endif
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@ -23,6 +23,12 @@
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#ifndef __ASSEMBLY__
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#ifndef CONFIG_MMU
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#include "page-nommu.h"
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#else
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#include <asm/glue.h>
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/*
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@ -171,6 +177,8 @@ typedef unsigned long pgprot_t;
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/* the upper-most page table pointer */
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extern pmd_t *top_pmd;
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#endif /* CONFIG_MMU */
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#include <asm/memory.h>
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#endif /* !__ASSEMBLY__ */
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@ -16,6 +16,10 @@
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#define check_pgt_cache() do { } while (0)
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#ifdef CONFIG_MMU
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#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
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#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
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#define pgd_alloc(mm) get_pgd_slow(mm)
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#define pgd_free(pgd) free_pgd_slow(pgd)
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#define check_pgt_cache() do { } while (0)
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/*
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* Allocate one PTE table.
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*
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__pmd_populate(pmdp, page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
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}
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#endif /* CONFIG_MMU */
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#endif
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@ -0,0 +1,123 @@
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/*
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* linux/include/asm-arm/pgtable-nommu.h
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*
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* Copyright (C) 1995-2002 Russell King
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* Copyright (C) 2004 Hyok S. Choi
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASMARM_PGTABLE_NOMMU_H
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#define _ASMARM_PGTABLE_NOMMU_H
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#ifndef __ASSEMBLY__
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#include <linux/config.h>
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#include <linux/slab.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/io.h>
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/*
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* Trivial page table functions.
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*/
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#define pgd_present(pgd) (1)
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#define pgd_none(pgd) (0)
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#define pgd_bad(pgd) (0)
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#define pgd_clear(pgdp)
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#define kern_addr_valid(addr) (1)
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#define pmd_offset(a, b) ((void *)0)
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/* FIXME */
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/*
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* PMD_SHIFT determines the size of the area a second-level page table can map
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* PGDIR_SHIFT determines what a third-level page table entry can map
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*/
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#define PGDIR_SHIFT 21
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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/* FIXME */
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#define PAGE_NONE __pgprot(0)
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#define PAGE_SHARED __pgprot(0)
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#define PAGE_COPY __pgprot(0)
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#define PAGE_READONLY __pgprot(0)
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#define PAGE_KERNEL __pgprot(0)
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//extern void paging_init(struct meminfo *, struct machine_desc *);
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#define swapper_pg_dir ((pgd_t *) 0)
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#define __swp_type(x) (0)
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#define __swp_offset(x) (0)
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#define __swp_entry(typ,off) ((swp_entry_t) { ((typ) | ((off) << 7)) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
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typedef pte_t *pte_addr_t;
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static inline int pte_file(pte_t pte) { return 0; }
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/*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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#define ZERO_PAGE(vaddr) (virt_to_page(0))
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/*
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* Mark the prot value as uncacheable and unbufferable.
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*/
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#define pgprot_noncached(prot) __pgprot(0)
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#define pgprot_writecombine(prot) __pgprot(0)
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/*
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* These would be in other places but having them here reduces the diffs.
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*/
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extern unsigned int kobjsize(const void *objp);
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extern int is_in_rom(unsigned long);
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/*
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* No page table caches to initialise.
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*/
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#define pgtable_cache_init() do { } while (0)
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#define io_remap_page_range remap_page_range
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#define io_remap_pfn_range remap_pfn_range
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#define MK_IOSPACE_PFN(space, pfn) (pfn)
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#define GET_IOSPACE(pfn) 0
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#define GET_PFN(pfn) (pfn)
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/*
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* All 32bit addresses are effectively valid for vmalloc...
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* Sort of meaningless for non-VM targets.
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*/
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#define VMALLOC_START 0
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#define VMALLOC_END 0xffffffff
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#define FIRST_USER_ADDRESS (0)
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#else
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/*
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* dummy tlb and user structures.
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*/
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#define v3_tlb_fns (0)
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#define v4_tlb_fns (0)
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#define v4wb_tlb_fns (0)
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#define v4wbi_tlb_fns (0)
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#define v6_tlb_fns (0)
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#define v3_user_fns (0)
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#define v4_user_fns (0)
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#define v4_mc_user_fns (0)
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#define v4wb_user_fns (0)
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#define v4wt_user_fns (0)
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#define v6_user_fns (0)
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#define xscale_mc_user_fns (0)
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#endif /*__ASSEMBLY__*/
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#endif /* _ASMARM_PGTABLE_H */
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#define _ASMARM_PGTABLE_H
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#include <asm-generic/4level-fixup.h>
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#include <asm/proc-fns.h>
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#ifndef CONFIG_MMU
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#include "pgtable-nommu.h"
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#else
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#include <asm/memory.h>
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#include <asm/proc-fns.h>
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#include <asm/arch/vmalloc.h>
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/*
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@ -378,4 +384,6 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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#endif /* !__ASSEMBLY__ */
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#endif /* CONFIG_MMU */
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#endif /* _ASMARM_PGTABLE_H */
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#include <asm/memory.h>
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#ifdef CONFIG_MMU
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#define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
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#define cpu_get_pgd() \
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(pgd_t *)phys_to_virt(pg); \
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})
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* __ASM_PROCFNS_H */
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