114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/* Copyright (C) 2000 Thomas Petazzoni
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Copyright (C) 2004 David Decotigny
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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USA.
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*/
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#ifndef _SOS_KMEM_VMM_H_
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#define _SOS_KMEM_VMM_H_
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/**
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* @file kmem_vmm.h
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*
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* Kernel Memory Allocator for multiple-page-sized objects residing in
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* the kernel (virtual memory) space. Relies on the slab cache
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* allocator to allocate its (internal) "range" data structure.
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*/
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#include <hwcore/paging.h>
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/* The base and top virtual addresses covered by the kernel allocator */
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#define SOS_KMEM_VMM_BASE SOS_PAGING_BASE_KERNEL_ADDRESS /* 16kB */
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#define SOS_KMEM_VMM_TOP (SOS_PAGING_UPPER_KERNEL_ADDRESS+1) /* 1GB - 4MB */
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/** Opaque structure used internally and declared here for physmem.h */
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struct sos_kmem_range;
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#include <sos/kmem_slab.h>
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/**
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* Mark the areas belonging to SOS_KMEM_VMM_BASE and SOS_KMEM_VMM_TOP
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* are either used or free. Those that are already mapped are marked
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* as "used", and the 0..SOS_KMEM_VMM_BASE virtual addresses as marked
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* as "used" too (to detect incorrect pointer dereferences).
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*/
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sos_ret_t
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sos_kmem_vmm_subsystem_setup(sos_vaddr_t kernel_core_base_vaddr,
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sos_vaddr_t kernel_core_top_vaddr,
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sos_vaddr_t bootstrap_stack_bottom_vaddr,
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sos_vaddr_t bootstrap_stack_top_vaddr);
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/*
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* Flags for kmem_vmm_new_range and kmem_vmm_alloc
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*/
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/** Physical pages should be immediately mapped */
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#define SOS_KMEM_VMM_MAP (1<<0)
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/** Allocation should either success or fail, without blocking */
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#define SOS_KMEM_VMM_ATOMIC (1<<1)
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/**
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* Allocate a new kernel area spanning one or multiple pages.
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*
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* @param range_base_vaddr If not NULL, the start address of the range
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* is stored in this location
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* @eturn a new range structure
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*/
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struct sos_kmem_range *sos_kmem_vmm_new_range(sos_size_t nb_pages,
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sos_ui32_t flags,
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sos_vaddr_t *range_base_vaddr);
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sos_ret_t sos_kmem_vmm_del_range(struct sos_kmem_range *range);
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/**
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* Straighforward variant of sos_kmem_vmm_new_range() returning the
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* range's start address instead of the range structure
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*/
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sos_vaddr_t sos_kmem_vmm_alloc(sos_size_t nb_pages,
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sos_ui32_t flags);
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/**
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* @note you are perfectly allowed to give the address of the
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* kernel image, or the address of the bios area here, it will work:
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* the kernel/bios WILL be "deallocated". But if you really want to do
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* this, well..., do expect some "surprises" ;)
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*/
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sos_ret_t sos_kmem_vmm_free(sos_vaddr_t vaddr);
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/**
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* @return TRUE when vaddr is covered by any (used) kernel range
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*/
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sos_bool_t sos_kmem_vmm_is_valid_vaddr(sos_vaddr_t vaddr);
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/* *****************************
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* Reserved to kmem_slab.c ONLY.
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*/
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/**
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* Associate the range with the given slab.
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*/
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sos_ret_t sos_kmem_vmm_set_slab(struct sos_kmem_range *range,
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struct sos_kslab *slab);
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/**
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* Retrieve the (used) slab associated with the range covering vaddr.
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*
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* @return NULL if the range is not associated with a KMEM range
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*/
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struct sos_kslab *sos_kmem_vmm_resolve_slab(sos_vaddr_t vaddr);
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#endif /* _SOS_KMEM_VMM_H_ */
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