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Allocate and free big pages

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This commit is contained in:
Braiden Vasco 2017-11-05 08:49:02 +00:00
parent b981271c64
commit 9dcd21f42e
2 changed files with 39 additions and 0 deletions
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36
arch/memory.c
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@ -45,6 +45,32 @@ unsigned long memory_alloc_page()
return 0;
}
unsigned long memory_alloc_big_page()
{
unsigned int start = 0;
for (unsigned int i = 0; i < FRAMES_COUNT; ++i) {
if (frames[i]) {
start = i + 1;
continue;
}
if (start % (PAGE_BIG_SIZE / PAGE_SIZE)) {
continue;
}
if (i - start + 1 == PAGE_BIG_SIZE / PAGE_SIZE) {
for (unsigned int j = start; j <= i; ++j) {
frames[j] = 0xFF;
}
return start * PAGE_SIZE;
}
}
return 0;
}
void memory_free_page(const unsigned long addr)
{
const unsigned long i = addr / PAGE_SIZE;
@ -56,6 +82,16 @@ void memory_free_page(const unsigned long addr)
frames[i] = 0;
}
void memory_free_big_page(const unsigned long addr)
{
const unsigned long start = addr / PAGE_SIZE;
const unsigned long end = start + PAGE_BIG_SIZE / PAGE_SIZE;
for (unsigned int i = start; i <= end && i < FRAMES_COUNT; ++i) {
frames[i] = 0;
}
}
void mark_used(const unsigned long base, const unsigned long limit)
{
const unsigned int start = base / PAGE_SIZE;

3
arch/memory.h
View file

@ -6,6 +6,9 @@
void memory_initialize(const struct KernelMQ_Info *kinfo);
unsigned long memory_alloc_page();
unsigned long memory_alloc_big_page();
void memory_free_page(unsigned long addr);
void memory_free_big_page(unsigned long addr);
#endif