119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/* $NetBSD: uvm_physseg.h,v 1.2 2016/12/22 08:15:20 cherry Exp $ */
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/*
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* Consolidated API from uvm_page.c and others.
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* Consolidated and designed by Cherry G. Mathew <cherry@zyx.in>
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*/
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#ifndef _UVM_UVM_PHYSSEG_H_
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#define _UVM_UVM_PHYSSEG_H_
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#if defined(_KERNEL_OPT)
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#include "opt_uvm_hotplug.h"
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#endif
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/types.h>
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/*
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* No APIs are explicitly #included in uvm_physseg.c
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*/
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#if defined(UVM_HOTPLUG) /* rbtree impementation */
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#define PRIxPHYSSEG "p"
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/*
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* These are specific values of invalid constants for uvm_physseg_t.
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* uvm_physseg_valid_p() == false on any of the below constants.
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*
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* Specific invalid constants encapsulate specific explicit failure
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* scenarios (see the comments next to them)
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*/
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#define UVM_PHYSSEG_TYPE_INVALID NULL /* Generic invalid value */
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#define UVM_PHYSSEG_TYPE_INVALID_EMPTY NULL /* empty segment access */
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#define UVM_PHYSSEG_TYPE_INVALID_OVERFLOW NULL /* ran off the end of the last segment */
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typedef struct uvm_physseg * uvm_physseg_t;
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#else /* UVM_HOTPLUG */
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#define PRIxPHYSSEG "d"
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/*
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* These are specific values of invalid constants for uvm_physseg_t.
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* uvm_physseg_valid_p() == false on any of the below constants.
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*
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* Specific invalid constants encapsulate specific explicit failure
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* scenarios (see the comments next to them)
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*/
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#define UVM_PHYSSEG_TYPE_INVALID -1 /* Generic invalid value */
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#define UVM_PHYSSEG_TYPE_INVALID_EMPTY -1 /* empty segment access */
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#define UVM_PHYSSEG_TYPE_INVALID_OVERFLOW (uvm_physseg_get_last() + 1) /* ran off the end of the last segment */
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typedef int uvm_physseg_t;
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#endif /* UVM_HOTPLUG */
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void uvm_physseg_init(void);
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bool uvm_physseg_valid_p(uvm_physseg_t);
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/*
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* Return start/end pfn of given segment
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* Returns: -1 if the segment number is invalid
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*/
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paddr_t uvm_physseg_get_start(uvm_physseg_t);
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paddr_t uvm_physseg_get_end(uvm_physseg_t);
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paddr_t uvm_physseg_get_avail_start(uvm_physseg_t);
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paddr_t uvm_physseg_get_avail_end(uvm_physseg_t);
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struct vm_page * uvm_physseg_get_pg(uvm_physseg_t, paddr_t);
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#ifdef __HAVE_PMAP_PHYSSEG
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struct pmap_physseg * uvm_physseg_get_pmseg(uvm_physseg_t);
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#endif
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int uvm_physseg_get_free_list(uvm_physseg_t);
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u_int uvm_physseg_get_start_hint(uvm_physseg_t);
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bool uvm_physseg_set_start_hint(uvm_physseg_t, u_int);
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/*
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* Functions to help walk the list of segments.
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* Returns: NULL if the segment number is invalid
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*/
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uvm_physseg_t uvm_physseg_get_next(uvm_physseg_t);
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uvm_physseg_t uvm_physseg_get_prev(uvm_physseg_t);
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uvm_physseg_t uvm_physseg_get_first(void);
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uvm_physseg_t uvm_physseg_get_last(void);
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/* Return the frame number of the highest registered physical page frame */
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paddr_t uvm_physseg_get_highest_frame(void);
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/* Actually, uvm_page_physload takes PF#s which need their own type */
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uvm_physseg_t uvm_page_physload(paddr_t, paddr_t, paddr_t,
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paddr_t, int);
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bool uvm_page_physunload(uvm_physseg_t, int, paddr_t *);
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bool uvm_page_physunload_force(uvm_physseg_t, int, paddr_t *);
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uvm_physseg_t uvm_physseg_find(paddr_t, psize_t *);
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bool uvm_physseg_plug(paddr_t, size_t, uvm_physseg_t *);
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bool uvm_physseg_unplug(paddr_t, size_t);
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#if defined(PMAP_STEAL_MEMORY)
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/*
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* XXX: Legacy: This needs to be upgraded to a full pa management
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* layer.
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*/
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void uvm_physseg_set_avail_start(uvm_physseg_t, paddr_t);
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void uvm_physseg_set_avail_end(uvm_physseg_t, paddr_t);
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#endif /* PMAP_STEAL_MEMORY */
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#endif /* _UVM_UVM_PHYSSEG_H_ */
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