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.
78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
/* Prototypes and definitions for VM interface. */
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#ifndef _MINIX_VM_H
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#define _MINIX_VM_H
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#include <minix/types.h>
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#include <minix/endpoint.h>
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_PROTOTYPE( int vm_exit, (endpoint_t ep));
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_PROTOTYPE( int vm_fork, (endpoint_t ep, int slotno, endpoint_t *child_ep));
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_PROTOTYPE( int vm_brk, (endpoint_t ep, char *newaddr));
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_PROTOTYPE( int vm_exec_newmem, (endpoint_t ep, struct exec_newmem *args,
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int args_bytes, char **ret_stack_top, int *ret_flags));
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_PROTOTYPE( int vm_push_sig, (endpoint_t ep, vir_bytes *old_sp));
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_PROTOTYPE( int vm_willexit, (endpoint_t ep));
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_PROTOTYPE( int vm_adddma, (endpoint_t req_e, endpoint_t proc_e,
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phys_bytes start, phys_bytes size) );
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_PROTOTYPE( int vm_deldma, (endpoint_t req_e, endpoint_t proc_e,
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phys_bytes start, phys_bytes size) );
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_PROTOTYPE( int vm_getdma, (endpoint_t req_e, endpoint_t *procp,
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phys_bytes *basep, phys_bytes *sizep) );
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_PROTOTYPE( void *vm_map_phys, (endpoint_t who, void *physaddr, size_t len));
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_PROTOTYPE( int vm_unmap_phys, (endpoint_t who, void *vaddr, size_t len));
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_PROTOTYPE( int vm_notify_sig, (endpoint_t ep, endpoint_t ipc_ep));
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_PROTOTYPE( int vm_ctl, (int what, int param));
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_PROTOTYPE( int vm_set_priv, (int procnr, void *buf));
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_PROTOTYPE( int vm_update, (endpoint_t src_e, endpoint_t dst_e));
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_PROTOTYPE( int vm_query_exit, (int *endpt));
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_PROTOTYPE( int vm_forgetblock, (u64_t id));
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_PROTOTYPE( void vm_forgetblocks, (void));
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_PROTOTYPE( int vm_yield_block_get_block, (u64_t yieldid, u64_t getid,
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void *mem, vir_bytes len));
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/* Invalid ID with special meaning for the vm_yield_block_get_block
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* interface.
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*/
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#define VM_BLOCKID_NONE make64(ULONG_MAX, ULONG_MAX)
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/* VM kernel request types. */
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#define VMPTYPE_NONE 0
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#define VMPTYPE_CHECK 1
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#define VMPTYPE_COWMAP 2
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#define VMPTYPE_SMAP 3
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#define VMPTYPE_SUNMAP 4
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struct vm_stats_info {
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int vsi_pagesize; /* page size */
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int vsi_total; /* total number of memory pages */
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int vsi_free; /* number of free pages */
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int vsi_largest; /* largest number of consecutive free pages */
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};
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struct vm_usage_info {
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vir_bytes vui_total; /* total amount of process memory */
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vir_bytes vui_common; /* part of memory mapped in more than once */
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vir_bytes vui_shared; /* shared (non-COW) part of common memory */
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};
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struct vm_region_info {
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int vri_seg; /* segment of virtual region (T or D) */
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vir_bytes vri_addr; /* base address of region */
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vir_bytes vri_length; /* length of region */
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int vri_prot; /* protection flags (PROT_) */
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int vri_flags; /* memory flags (subset of MAP_) */
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};
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#define MAX_VRI_COUNT 64 /* max. number of regions provided at once */
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_PROTOTYPE( int vm_info_stats, (struct vm_stats_info *vfi) );
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_PROTOTYPE( int vm_info_usage, (endpoint_t who,
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struct vm_usage_info *vui) );
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_PROTOTYPE( int vm_info_region, (endpoint_t who,
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struct vm_region_info *vri, int count, vir_bytes *next) );
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#endif /* _MINIX_VM_H */
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