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
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
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#ifndef _PAGETABLE_H
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#define _PAGETABLE_H 1
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#include <stdint.h>
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#include <sys/vm_i386.h>
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#include "../vm.h"
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/* An i386 pagetable. */
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typedef struct {
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/* Directory entries in VM addr space - root of page table. */
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u32_t *pt_dir; /* page aligned (I386_VM_DIR_ENTRIES) */
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u32_t pt_dir_phys; /* physical address of pt_dir */
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/* Pointers to page tables in VM address space. */
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u32_t *pt_pt[I386_VM_DIR_ENTRIES];
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/* When looking for a hole in virtual address space, start
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* looking here. This is in linear addresses, i.e.,
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* not as the process sees it but the position in the page
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* page table. This is just a hint.
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*/
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u32_t pt_virtop;
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} pt_t;
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/* Mapping flags. */
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#define PTF_WRITE I386_VM_WRITE
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#define PTF_PRESENT I386_VM_PRESENT
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#define PTF_USER I386_VM_USER
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#define PTF_GLOBAL I386_VM_GLOBAL
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#define PTF_MAPALLOC I386_VM_PTAVAIL1 /* Page allocated by pt code. */
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/* For arch-specific PT routines to check if no bits outside
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* the regular flags are set.
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*/
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#define PTF_ALLFLAGS (PTF_WRITE|PTF_PRESENT|PTF_USER|PTF_GLOBAL)
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#if SANITYCHECKS
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#define PT_SANE(p) { pt_sanitycheck((p), __FILE__, __LINE__); }
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#else
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#define PT_SANE(p)
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#endif
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#endif
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