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memlayout: Store region sizes as separate symbols

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This patch changes the memlayout macro infrastructure so that the size
of a region "xxx" (i.e. the distance between the symbols _xxx and _exxx)
is stored in a separate _xxx_size symbol. This has the advantage that
region sizes can be used inside static initializers, and also saves an
extra subtraction at runtime. Since linker symbols can only be treated
as addresses (not as raw integers) by C, retain the REGION_SIZE()
accessor macro to hide the necessary typecast.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: Ifd89708ca9bd3937d0db7308959231106a6aa373
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49332
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Julius Werner
2020-12-30 15:51:10 -08:00
committed by Patrick Georgi
parent 422501fb14
commit 82d16b150c
19 changed files with 76 additions and 56 deletions
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2
src/arch/x86/c_start.S
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@@ -8,6 +8,7 @@
.section .bss, "aw", @nobits
.global _stack
.global _estack
.global _stack_size
/* Stack alignment is not enforced with rmodule loader, reserve one
* extra CPU such that alignment can be enforced on entry. */
@@ -15,6 +16,7 @@
_stack:
.space (CONFIG_MAX_CPUS+1)*CONFIG_STACK_SIZE
_estack:
.set _stack_size, _estack - _stack
#if CONFIG(COOP_MULTITASKING)
.global thread_stacks
thread_stacks: