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https://github.com/drasko/codezero.git
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965f2f9456
Changes: It is now possible to use do_mmap() from within mm0. - pager_new_virtual()/delete_virtual() return addresses that are disjoint from find_unmapped_area() used by mmap() interface for anonymous or not-fixed areas. - find_unmapped_area() now uses task->map_start task->map_end instead of task->start and task->end. task->start/end are still valid task space addresses for mmap(), but finding a new address is limited to map_start/map_end. - We have both interfaces because mmap() is only useful for backed-files. When the pager needs to access a user memory range for example, that is not backed by a file and thus we need to use pager_new_virtual() instead of mmap() for mapping.
38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
/*
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* Physical page descriptor
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#ifndef __MEMORY_H__
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#define __MEMORY_H__
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#include <vm_area.h>
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#include <init.h>
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#include <physmem.h>
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#include <linker.h>
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#define PAGER_MMAP_SEGMENT SZ_4MB
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#define PAGER_MMAP_START (page_align_up(__stack))
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#define PAGER_MMAP_END (PAGER_MMAP_START + PAGER_MMAP_SEGMENT)
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void init_mm_descriptors(struct page_bitmap *page_map,
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struct bootdesc *bootdesc, struct membank *membank);
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void init_physmem(void);
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int pager_address_pool_init(void);
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void *pager_new_address(int npages);
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int pager_delete_address(void *virt_addr, int npages);
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void *pager_map_pages(struct vm_file *f, unsigned long page_offset, unsigned long npages);
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void pager_unmap_pages(void *addr, unsigned long npages);
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void *pager_map_page(struct vm_file *f, unsigned long page_offset);
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void pager_unmap_page(void *addr);
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void *pager_map_file_range(struct vm_file *f, unsigned long byte_offset,
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unsigned long size);
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void *pager_validate_map_user_range2(struct tcb *user, void *userptr,
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unsigned long size, unsigned int vm_flags);
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void *l4_new_virtual(int npages);
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void *l4_del_virtual(void *virt, int npages);
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#endif /* __MEMORY_H__ */
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