Lephe
162b11cc73
This change introduces a centralized memory allocator in the kernel. This interface can call into multiple arenas, including the default OS heap and planned arenas managed by a gint algorithm. The main advantage of this method is that it allows the heap to be extended over previously-unused areas of RAM such as the end of the static RAM region (apart from where the stack resides). Not using the OS heap is also sometimes a matter of correctness since on some OS versions the heap is known to fragment badly and degrade over time. I hope the deep control this interfaces gives over meomry allocation will allow very particular applications like object-specific allocators in fragmented SPU memory. This change does not introduce any new algorithm or arena so programs should behave exactly as before.
41 lines
1,012 B
C
41 lines
1,012 B
C
//---
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// gint:kmalloc:arena_osheap - An arena that uses the OS heap as input
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//---
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#include <gint/kmalloc.h>
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#include <gint/defs/attributes.h>
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/* Syscalls relating to the OS heap */
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extern void *__malloc(size_t size);
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extern void *__realloc(void *ptr, size_t newsize);
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extern void __free(void *ptr);
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static void *osheap_malloc(size_t size, GUNUSED void *data)
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{
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return __malloc(size);
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}
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static void *osheap_realloc(void *ptr, size_t newsize, GUNUSED void *data)
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{
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return __realloc(ptr, newsize);
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}
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static void osheap_free(void *ptr, GUNUSED void *data)
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{
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return __free(ptr);
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}
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/* This is a global variable, it's pulled by kmalloc.c. This arena is the only
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one allowed to not specify start/end as the values are hard to determine. */
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kmalloc_arena_t kmalloc_arena_osheap = {
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.malloc = osheap_malloc,
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.realloc = osheap_realloc,
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.free = osheap_free,
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.name = "_os",
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.start = NULL,
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.end = NULL,
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.data = NULL,
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.is_default = 1,
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.stats = { 0 },
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};
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