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allocator_v4: Introduce RESOURCE_ALLOCATION_TOP_DOWN

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Add option to resource allocator v4 that restores the top-down
allocation approach at the domain level.

This makes it easier to handle 64-bit resources natively. With
the top-down approach, resources that can be placed either above
or below 4G would be placed above, to save precious space below
the 4G boundary.

Change-Id: Iaf463d3e6b37d52e46761d8e210034fded58a8a4
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41957
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
This commit is contained in:
Nico Huber
2020-05-25 00:03:14 +02:00
committed by Martin L Roth
parent 38688519cf
commit 526c64249a
5 changed files with 72 additions and 34 deletions
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12
src/include/memrange.h
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@@ -161,15 +161,17 @@ struct range_entry *memranges_next_entry(struct memranges *ranges,
const struct range_entry *r);
/* Steals memory from the available list in given ranges as per the constraints:
* limit = Upper bound for the memory range to steal (Inclusive).
* size = Requested size for the stolen memory.
* align = Required alignment(log 2) for the starting address of the stolen memory.
* tag = Use a range that matches the given tag.
* limit = Upper bound for the memory range to steal (Inclusive).
* size = Requested size for the stolen memory.
* align = Required alignment(log 2) for the starting address of the stolen memory.
* tag = Use a range that matches the given tag.
* from_top = Steal the highest possible range.
*
* If the constraints can be satisfied, this function creates a hole in the memrange,
* writes the base address of that hole to stolen_base and returns true. Otherwise it returns
* false. */
bool memranges_steal(struct memranges *ranges, resource_t limit, resource_t size,
unsigned char align, unsigned long tag, resource_t *stolen_base);
unsigned char align, unsigned long tag, resource_t *stolen_base,
bool from_top);
#endif /* MEMRANGE_H_ */