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Added a global variable at the end of the kernel to detect its size.

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This lets the kernel use any memory not directly used by it or the
init ramdisk. Although, now we test whether the kernel fits into
the identitymapped area. It can't really grow down there, unless it
wants to collide with user-space. Instead, modules and the like
(when they are invented), should be put in the upper memory. Or in
their own user-space process, yay, microkernel!
This commit is contained in:
Jonas 'Sortie' Termansen 2011-12-23 13:09:09 +01:00
parent 0515111314
commit ba9b715c59
3 changed files with 47 additions and 3 deletions
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1
sortix/Makefile
View file

@ -87,6 +87,7 @@ fs/devfs.o \
fs/initfs.o \
fs/ramfs.o \
../libmaxsi/libmaxsi-sortix.a \
end.o # Must be last
JSOBJS:=$(subst .o,-js.o,$(OBJS))

33
sortix/end.cpp Normal file
View file

@ -0,0 +1,33 @@
/******************************************************************************
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
This file is part of Sortix.
Sortix 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 3 of the License, or (at your option) any later
version.
Sortix 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 Sortix. If not, see <http://www.gnu.org/licenses/>.
end.cpp
Places a symbol at the end of the kernel binary. This allows us to easily
detect the size of the kernel. Be sure to put this one last in the linking
command.
******************************************************************************/
#include "platform.h"
namespace Sortix
{
size_t end; // Put in the bss, the last segment.
}

16
sortix/x86-family/memorymanagement.cpp
View file

@ -35,7 +35,7 @@ using namespace Maxsi;
namespace Sortix
{
const addr_t KERNELEND = 0x200000UL;
extern size_t end;
namespace Page
{
@ -57,11 +57,21 @@ namespace Sortix
void Init(multiboot_info_t* bootinfo)
{
const size_t MAXKERNELEND = 0x400000UL; /* 4 MiB */
addr_t kernelend = Page::AlignUp((addr_t) &end);
if ( MAXKERNELEND < kernelend )
{
Log::PrintF("Warning: The kernel is too big! It ends at 0x%zx, "
"but the highest ending address supported is 0x%zx. "
"The system may not boot correctly.\n", kernelend,
MAXKERNELEND);
}
Page::pagesnotonstack = 0;
Page::totalmem = 0;
// The first mebibytes are reserved for use by the kernel.
Page::pagesallocated = KERNELEND >> 12UL;
Page::pagesallocated = kernelend >> 12UL;
if ( !( bootinfo->flags & MULTIBOOT_INFO_MEM_MAP ) )
{
@ -109,7 +119,7 @@ namespace Sortix
addr_t highest = regionend;
// Don't allocate the kernel.
if ( lowest < KERNELEND ) { processed = KERNELEND; continue; }
if ( lowest < kernelend ) { processed = kernelend; continue; }
// Don't give any of our modules to the physical page
// allocator, we'll need them.