32fbbd370c
shared with the kernel, mapped into kernel address space; kernel is notified of its location. kernel segment size is increased to make it fit. - map in kernel and other processes that don't have their own page table using single 4MB (global) mapping. - new sanity check facility: objects that are allocated with the slab allocator are, when running with sanity checking on, marked readonly until they are explicitly unlocked using the USE() macro. - another sanity check facility: collect all uses of memory and see if they don't overlap with (a) eachother and (b) free memory - own munmap() and munmap_text() functions. - exec() recovers from out-of-memory conditions properly now; this solves some weird exec() behaviour - chew off memory from the same side of the chunk as where we start scanning, solving some memory fragmentation issues - use avl trees for freelist and phys_ranges in regions - implement most useful part of munmap() - remap() stuff is GQ's for shared memory
79 lines
2 KiB
C
79 lines
2 KiB
C
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#ifndef _REGION_H
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#define _REGION_H 1
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/ds.h>
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#include <minix/endpoint.h>
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#include <minix/keymap.h>
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#include <minix/minlib.h>
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#include <minix/type.h>
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#include <minix/ipc.h>
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#include <minix/sysutil.h>
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#include <minix/syslib.h>
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#include <minix/const.h>
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struct phys_block {
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#if SANITYCHECKS
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u32_t seencount;
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#endif
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vir_bytes length; /* no. of contiguous bytes */
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phys_bytes phys; /* physical memory */
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u8_t refcount; /* Refcount of these pages */
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/* first in list of phys_regions that reference this block */
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struct phys_region *firstregion;
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};
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typedef struct phys_region {
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struct phys_block *ph;
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struct vir_region *parent; /* parent vir_region. */
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vir_bytes offset; /* offset from start of vir region */
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/* list of phys_regions that reference the same phys_block */
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struct phys_region *next_ph_list;
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/* AVL fields */
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struct phys_region *less, *greater;
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int factor;
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} phys_region_t;
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#include "physravl.h"
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struct vir_region {
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struct vir_region *next; /* next virtual region in this process */
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vir_bytes vaddr; /* virtual address, offset from pagetable */
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vir_bytes length; /* length in bytes */
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physr_avl *phys; /* avl tree of physical memory blocks */
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u16_t flags;
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u32_t tag; /* Opaque to mapping code. */
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struct vmproc *parent; /* Process that owns this vir_region. */
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};
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/* Mapping flags: */
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#define VR_WRITABLE 0x001 /* Process may write here. */
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#define VR_NOPF 0x002 /* May not generate page faults. */
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#define VR_PHYS64K 0x004 /* Physical memory must be 64k aligned. */
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#define VR_LOWER16MB 0x008
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#define VR_LOWER1MB 0x010
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/* Mapping type: */
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#define VR_ANON 0x100 /* Memory to be cleared and allocated */
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#define VR_DIRECT 0x200 /* Mapped, but not managed by VM */
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#define VR_SHARED 0x40
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/* Tag values: */
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#define VRT_NONE 0xBEEF0000
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#define VRT_HEAP 0xBEEF0001
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#define VRT_CODE 0xBEEF0002
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/* map_page_region flags */
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#define MF_PREALLOC 0x01
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#define MF_CONTIG 0x02
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#endif
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