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Added the MapRange virtual memory functions.

This commit is contained in:
Jonas 'Sortie' Termansen 2011-08-22 22:11:28 +02:00
parent b80195dc19
commit e5eaf3eeb5
1 changed files with 60 additions and 0 deletions
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60
sortix/memorymanagement.cpp
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@ -563,6 +563,66 @@ namespace Sortix
return result;
}
bool MapRangeKernel(addr_t where, size_t bytes)
{
for ( addr_t page = where; page < where + bytes; page += 4096UL )
{
addr_t physicalpage = Page::Get();
if ( physicalpage == 0 )
{
while ( where < page )
{
page -= 4096UL;
physicalpage = UnmapKernel(page);
Page::Put(physicalpage);
}
return false;
}
MapKernel(where, physicalpage);
}
return true;
}
void UnmapRangeKernel(addr_t where, size_t bytes)
{
for ( addr_t page = where; page < where + bytes; page += 4096UL )
{
addr_t physicalpage = UnmapKernel(page);
Page::Put(physicalpage);
}
}
bool MapRangeUser(addr_t where, size_t bytes)
{
for ( addr_t page = where; page < where + bytes; page += 4096UL )
{
addr_t physicalpage = Page::Get();
if ( physicalpage == 0 || !MapUser(where, physicalpage) )
{
while ( where < page )
{
page -= 4096UL;
physicalpage = UnmapUser(page);
Page::Put(physicalpage);
}
return false;
}
}
return true;
}
void UnmapRangeUser(addr_t where, size_t bytes)
{
for ( addr_t page = where; page < where + bytes; page += 4096UL )
{
addr_t physicalpage = UnmapUser(page);
Page::Put(physicalpage);
}
}
#else
#warning "Virtual Memory is not available on this arch"