f78d8e74fd
A new call to vm lets processes yield a part of their memory to vm, together with an id, getting newly allocated memory in return. vm is allowed to forget about it if it runs out of memory. processes can ask for it back using the same id. (These two operations are normally combined in a single call.) It can be used as a as-big-as-memory-will-allow block cache for filesystems, which is how mfs now uses it.
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
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#ifndef _VMPROC_H
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#define _VMPROC_H 1
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#include <pagetable.h>
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#include <arch_vmproc.h>
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#include <minix/bitmap.h>
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#include <machine/archtypes.h>
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#include "vm.h"
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#include "physravl.h"
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#include "yieldedavl.h"
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struct vmproc;
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typedef void (*callback_t)(struct vmproc *who, message *m);
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struct vmproc {
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struct vm_arch vm_arch; /* architecture-specific data */
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int vm_flags;
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endpoint_t vm_endpoint;
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pt_t vm_pt; /* page table data, if VMF_HASPT is set */
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vir_bytes vm_stacktop; /* top of stack as seen from process */
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vir_bytes vm_offset; /* offset of addr 0 for process */
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/* File identification for cs sharing. */
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ino_t vm_ino; /* inode number of file */
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dev_t vm_dev; /* device number of file system */
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time_t vm_ctime; /* inode changed time */
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/* Regions in virtual address space. */
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struct vir_region *vm_regions;
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yielded_avl vm_yielded_blocks; /* avl of yielded physblocks */
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/* Heap for brk() to extend. */
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struct vir_region *vm_heap;
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bitchunk_t vm_call_mask[VM_CALL_MASK_SIZE];
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/* State for requests pending to be done to vfs on behalf of
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* this process.
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*/
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callback_t vm_callback; /* function to call on vfs reply */
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int vm_callback_type; /* expected message type */
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int vm_slot; /* process table slot */
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union {
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struct {
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cp_grant_id_t gid;
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} open; /* VM_VFS_OPEN */
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} vm_state; /* Callback state. */
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#if VMSTATS
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int vm_bytecopies;
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#endif
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};
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/* Bits for vm_flags */
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#define VMF_INUSE 0x001 /* slot contains a process */
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#define VMF_SEPARATE 0x002 /* separate i&d */
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#define VMF_HASPT 0x004 /* has private page table */
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#define VMF_EXITING 0x008 /* PM is cleaning up this process */
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#define VMF_HAS_DMA 0x010 /* Process directly or indirectly granted
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* DMA buffers.
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*/
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#endif
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