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
29 lines
1 KiB
C
29 lines
1 KiB
C
#include <sys/vm_i386.h>
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/* As visible from the user space process, where is the top of the
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* stack (first non-stack byte), when in paged mode?
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*/
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#define VM_STACKTOP 0x80000000
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/* And what is the highest addressable piece of memory, when in paged
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* mode? Some data for kernel and stack are subtracted from this, the
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* final results stored in bytes in arch.vm_data_top.
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*/
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#define VM_DATATOP 0xFFFFF000
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#define SLAB_PAGESIZE I386_PAGE_SIZE
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#define VM_PAGE_SIZE I386_PAGE_SIZE
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/* Where do processes start in linear (i.e. page table) memory? */
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#define VM_PROCSTART (I386_BIG_PAGE_SIZE*100)
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#define CLICKSPERPAGE (I386_PAGE_SIZE/CLICK_SIZE)
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/* Where is the kernel? */
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#define KERNEL_TEXT CLICK2ABS(vmproc[VMP_SYSTEM].vm_arch.vm_seg[T].mem_phys)
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#define KERNEL_TEXT_LEN CLICK2ABS(vmproc[VMP_SYSTEM].vm_arch.vm_seg[T].mem_len)
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#define KERNEL_DATA CLICK2ABS(vmproc[VMP_SYSTEM].vm_arch.vm_seg[D].mem_phys)
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#define KERNEL_DATA_LEN CLICK2ABS(vmproc[VMP_SYSTEM].vm_arch.vm_seg[D].mem_len \
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+ vmproc[VMP_SYSTEM].vm_arch.vm_seg[S].mem_len)
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