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6302e8b73a
This commit makes several fundamental changes to memory handling:
- the frame allocator is now only an allocator for free frames, and does
not track used frames.
- the frame allocator now stores its free list inside the free frames
themselves, as a hybrid stack/span model.
- This has the implication that all frames must currently fit within
the offset area.
- kutil has a new allocator interface, which is the only allowed way for
any code outside of src/kernel to allocate. Code under src/kernel
_may_ use new/delete, but should prefer the allocator interface.
- the heap manager has become heap_allocator, which is merely an
implementation of kutil::allocator which doles out sections of a given
address range.
- the heap manager now only writes block headers when necessary,
avoiding page faults until they're actually needed
- page_manager now has a page fault handler, which checks with the
address_manager to see if the address is known, and provides a frame
mapping if it is, allowing heap manager to work with its entire
address size from the start. (Currently 32GiB.)
36 lines
738 B
C++
36 lines
738 B
C++
#include "kutil/memory.h"
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namespace std {
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enum class __attribute__ ((__type_visibility("default"))) align_val_t : size_t { };
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}
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namespace kutil {
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void *
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memset(void *s, uint8_t v, size_t n)
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{
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uint8_t *p = reinterpret_cast<uint8_t *>(s);
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for (size_t i = 0; i < n; ++i) p[i] = v;
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return s;
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}
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void *
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memcpy(void *dest, const void *src, size_t n)
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{
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const uint8_t *s = reinterpret_cast<const uint8_t *>(src);
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uint8_t *d = reinterpret_cast<uint8_t *>(dest);
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for (size_t i = 0; i < n; ++i) d[i] = s[i];
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return d;
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}
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uint8_t
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checksum(const void *p, size_t len, size_t off)
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{
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uint8_t sum = 0;
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const uint8_t *c = reinterpret_cast<const uint8_t *>(p);
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for (int i = off; i < len; ++i) sum += c[i];
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return sum;
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}
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} // namespace kutil
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