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Gregor HaasandAnup Patel b9c091ed89 lib: sbi: Implement aligned memory allocators 
This change adds a simple implementation of sbi_aligned_alloc(), for future use
in allocating aligned memory for SMMTT tables.

Signed-off-by: Gregor Haas <gregorhaas1997@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
 2024-08-09 08:51:27 +05:30
Gregor HaasandAnup Patel cda0014795 lib: sbi: Allocate from beginning of heap blocks 
In the next commit, we'll add a new sbi_memalign() function. In order to
allocate aligned memory, we'll sometimes need to allocate from the middle of a
heap block, effectively splitting it in two. Allocating from the beginning of a
heap block in the nonaligned case more closely matches this behavior, reducing
the complexity of understanding the heap implementation.

Signed-off-by: Gregor Haas <gregorhaas1997@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
 2024-08-09 08:51:26 +05:30
Gregor HaasandAnup Patel 8b898c4e50 lib: sbi: Support multiple heaps 
The upcoming SMMTT implementation will require some larger contiguous memory
regions for the memory tracking tables. We plan to specify the memory region
for these tables as a reserved-memory node in the device tree, and then
dynamically allocate individual tables out of this region. These changes to the
SBI heap allocator will allow us to explicitly create and allocate from a
dedicated heap tied to the table memory region.

Signed-off-by: Gregor Haas <gregorhaas1997@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
 2024-08-09 08:51:24 +05:30