148 lines
4.7 KiB
C
148 lines
4.7 KiB
C
/* Copyright (C) 2004 David Decotigny
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Copyright (C) 2000 The KOS Team
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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_PHYSMEM_H_
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#define _SOS_PHYSMEM_H_
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/**
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* @file physmem.h
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*
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* Physical pages of memory
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*/
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#include <sos/errno.h>
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#include <sos/types.h>
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#include <sos/macros.h>
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/** The size of a physical page (arch-dependent) */
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#define SOS_PAGE_SIZE (4*1024)
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/** The corresponding shift */
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#define SOS_PAGE_SHIFT 12 /* 4 kB = 2^12 B */
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/** The corresponding mask */
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#define SOS_PAGE_MASK ((1<<12) - 1)
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#define SOS_PAGE_ALIGN_INF(val) \
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SOS_ALIGN_INF((val), SOS_PAGE_SIZE)
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#define SOS_PAGE_ALIGN_SUP(val) \
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SOS_ALIGN_SUP((val), SOS_PAGE_SIZE)
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#define SOS_IS_PAGE_ALIGNED(val) \
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SOS_IS_ALIGNED((val), SOS_PAGE_SIZE)
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/**
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* This is the reserved physical interval for the x86 video memory and
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* BIOS area. In physmem.c, we have to mark this area as "used" in
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* order to prevent from allocating it. And in paging.c, we'd better
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* map it in virtual space if we really want to be able to print to
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* the screen (for debugging purpose, at least): for this, the
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* simplest is to identity-map this area in virtual space (note
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* however that this mapping could also be non-identical).
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*/
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#define BIOS_N_VIDEO_START 0xa0000
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#define BIOS_N_VIDEO_END 0x100000
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/**
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* Initialize the physical memory subsystem, for the physical area [0,
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* ram_size). This routine takes into account the BIOS and video
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* areas, to prevent them from future allocations.
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*
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* @param ram_size The size of the RAM that will be managed by this subsystem
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*
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* @param kernel_core_base The lowest address for which the kernel
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* assumes identity mapping (ie virtual address == physical address)
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* will be stored here
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*
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* @param kernel_core_top The top address for which the kernel
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* assumes identity mapping (ie virtual address == physical address)
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* will be stored here
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*/
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sos_ret_t sos_physmem_subsystem_setup(sos_size_t ram_size,
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/* out */sos_paddr_t *kernel_core_base,
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/* out */sos_paddr_t *kernel_core_top);
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/**
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* Retrieve the total number of pages, and the number of free pages
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*/
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sos_ret_t sos_physmem_get_state(/* out */sos_count_t *total_ppages,
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/* out */sos_count_t *used_ppages);
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/**
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* Get a free page.
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*
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* @return The (physical) address of the (physical) page allocated, or
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* NULL when none currently available.
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*
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* @param can_block TRUE if the function is allowed to block
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* @note The page returned has a reference count equal to 1.
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*/
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sos_paddr_t sos_physmem_ref_physpage_new(sos_bool_t can_block);
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/**
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* Increment the reference count of a given physical page. Useful for
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* VM code which tries to map a precise physical address.
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*
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* @param ppage_paddr Physical address of the page (MUST be page-aligned)
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*
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* @return TRUE when the page was previously in use, FALSE when the
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* page was previously in the free list, <0 when the page address is
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* invalid.
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*/
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sos_ret_t sos_physmem_ref_physpage_at(sos_paddr_t ppage_paddr);
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/**
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* Decrement the reference count of the given physical page. When this
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* reference count reaches 0, the page is marked free, ie is available
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* for future sos_physmem_get_physpage()
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*
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* @param ppage_paddr Physical address of the page (MUST be page-aligned)
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*
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* @return FALSE when the page is still in use, TRUE when the page is now
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* unreferenced, <0 when the page address is invalid
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*/
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sos_ret_t sos_physmem_unref_physpage(sos_paddr_t ppage_paddr);
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#include <sos/kmem_vmm.h>
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/**
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* Return the kernel memory allocation range associated with the given
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* physical page, or NULL when page has no associated range
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*
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* @param ppage_paddr Physical address of the page (MUST be page-aligned)
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*/
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struct sos_kmem_range* sos_physmem_get_kmem_range(sos_paddr_t ppage_paddr);
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/**
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* Set the kernel memory allocation range associated to the given
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* physical page.
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*
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* @param ppage_paddr Physical address of the page (MUST be page-aligned)
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*
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* @return error if page is invalid
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*/
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sos_ret_t sos_physmem_set_kmem_range(sos_paddr_t ppage_paddr,
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struct sos_kmem_range *range);
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#endif /* _SOS_PHYSMEM_H_ */
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