From a8968330aff45e0b8cf278f49fa337d5fcb9bfd8 Mon Sep 17 00:00:00 2001 From: Alex AUVOLAT Date: Fri, 28 Mar 2014 17:09:15 +0100 Subject: Import and compile code for article 6.5 --- sos-code-article6.5/sos/kmem_vmm.h | 113 +++++++++++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 sos-code-article6.5/sos/kmem_vmm.h (limited to 'sos-code-article6.5/sos/kmem_vmm.h') diff --git a/sos-code-article6.5/sos/kmem_vmm.h b/sos-code-article6.5/sos/kmem_vmm.h new file mode 100644 index 0000000..49b262d --- /dev/null +++ b/sos-code-article6.5/sos/kmem_vmm.h @@ -0,0 +1,113 @@ +/* Copyright (C) 2000 Thomas Petazzoni + Copyright (C) 2004 David Decotigny + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License + as published by the Free Software Foundation; either version 2 + of the License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, + USA. +*/ +#ifndef _SOS_KMEM_VMM_H_ +#define _SOS_KMEM_VMM_H_ + +/** + * @file kmem_vmm.h + * + * Kernel Memory Allocator for multiple-page-sized objects residing in + * the kernel (virtual memory) space. Relies on the slab cache + * allocator to allocate its (internal) "range" data structure. + */ + +#include + +/* The base and top virtual addresses covered by the kernel allocator */ +#define SOS_KMEM_VMM_BASE 0x4000 /* 16kB */ +#define SOS_KMEM_VMM_TOP SOS_PAGING_MIRROR_VADDR /* 1GB - 4MB */ + +/** Opaque structure used internally and declared here for physmem.h */ +struct sos_kmem_range; + +#include + +/** + * Mark the areas belonging to SOS_KMEM_VMM_BASE and SOS_KMEM_VMM_TOP + * are either used or free. Those that are already mapped are marked + * as "used", and the 0..SOS_KMEM_VMM_BASE virtual addresses as marked + * as "used" too (to detect incorrect pointer dereferences). + */ +sos_ret_t +sos_kmem_vmm_subsystem_setup(sos_vaddr_t kernel_core_base_vaddr, + sos_vaddr_t kernel_core_top_vaddr, + sos_vaddr_t bootstrap_stack_bottom_vaddr, + sos_vaddr_t bootstrap_stack_top_vaddr); + + +/* + * Flags for kmem_vmm_new_range and kmem_vmm_alloc + */ +/** Physical pages should be immediately mapped */ +#define SOS_KMEM_VMM_MAP (1<<0) +/** Allocation should either success or fail, without blocking */ +#define SOS_KMEM_VMM_ATOMIC (1<<1) + +/** + * Allocate a new kernel area spanning one or multiple pages. + * + * @param range_base_vaddr If not NULL, the start address of the range + * is stored in this location + * @eturn a new range structure + */ +struct sos_kmem_range *sos_kmem_vmm_new_range(sos_size_t nb_pages, + sos_ui32_t flags, + sos_vaddr_t *range_base_vaddr); +sos_ret_t sos_kmem_vmm_del_range(struct sos_kmem_range *range); + + +/** + * Straighforward variant of sos_kmem_vmm_new_range() returning the + * range's start address instead of the range structure + */ +sos_vaddr_t sos_kmem_vmm_alloc(sos_size_t nb_pages, + sos_ui32_t flags); + +/** + * @note you are perfectly allowed to give the address of the + * kernel image, or the address of the bios area here, it will work: + * the kernel/bios WILL be "deallocated". But if you really want to do + * this, well..., do expect some "surprises" ;) + */ +sos_ret_t sos_kmem_vmm_free(sos_vaddr_t vaddr); + + +/** + * @return TRUE when vaddr is covered by any (used) kernel range + */ +sos_bool_t sos_kmem_vmm_is_valid_vaddr(sos_vaddr_t vaddr); + + +/* ***************************** + * Reserved to kmem_slab.c ONLY. + */ +/** + * Associate the range with the given slab. + */ +sos_ret_t sos_kmem_vmm_set_slab(struct sos_kmem_range *range, + struct sos_kslab *slab); + +/** + * Retrieve the (used) slab associated with the range covering vaddr. + * + * @return NULL if the range is not associated with a KMEM range + */ +struct sos_kslab *sos_kmem_vmm_resolve_slab(sos_vaddr_t vaddr); + +#endif /* _SOS_KMEM_VMM_H_ */ -- cgit v1.2.3