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Add interface to get 32-bit pages.

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This commit is contained in:
Jonas 'Sortie' Termansen 2015-01-17 22:17:51 +01:00
parent eb11613da6
commit 73a182f80c
2 changed files with 36 additions and 0 deletions
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2
kernel/include/sortix/kernel/memorymanagement.h
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@ -63,6 +63,8 @@ addr_t GetReserved(size_t* counter, enum page_usage usage);
addr_t GetReservedUnlocked(size_t* counter, enum page_usage usage);
addr_t Get(enum page_usage usage);
addr_t GetUnlocked(enum page_usage usage);
addr_t Get32Bit(enum page_usage usage);
addr_t Get32BitUnlocked(enum page_usage usage);
void Put(addr_t page, enum page_usage usage);
void PutUnlocked(addr_t page, enum page_usage usage);
void Lock();

34
kernel/x86-family/memorymanagement.cpp
View file

@ -340,6 +340,40 @@ addr_t Get(enum page_usage usage)
return GetUnlocked(usage);
}
// TODO: This competes with the normal allocation for precious 32-bit pages, we
// should use different pools for this, and preferably preallocate some
// 32-bit pages exclusively for driver usage. Also, get proper hardware
// without these issues.
addr_t Get32BitUnlocked(enum page_usage usage)
{
assert(stackreserved <= stackused);
if ( unlikely(stackreserved == stackused) )
return errno = ENOMEM, 0;
for ( size_t ii = stackused; 0 < ii; ii-- )
{
size_t i = ii - 1;
addr_t result = STACK[i];
assert(result == AlignDown(result));
if ( 4 < sizeof(void*) && UINT32_MAX < result )
continue;
if ( i + 1 != stackused )
{
STACK[i] = STACK[stackused - 1];
STACK[stackused - 1] = result;
}
stackused--;
PageUsageRegisterUse(result, usage);
return result;
}
return errno = ENOMEM, 0;
}
addr_t Get32Bit(enum page_usage usage)
{
ScopedLock lock(&pagelock);
return Get32BitUnlocked(usage);
}
void PutUnlocked(addr_t page, enum page_usage usage)
{
assert(page == AlignDown(page));