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x86: fsp: Mark memory used by U-Boot as reserved in the E820 table for S3

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U-Boot itself as well as everything that is consumed by U-Boot (like
heap, stack, dtb, etc) needs to be reserved and reported in the E820
table when S3 resume is on.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Bin Meng
2017-04-21 07:24:34 -07:00
parent e652e1304a
commit 7d0d2efef8
2 changed files with 20 additions and 0 deletions
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8
arch/x86/Kconfig
View File

@@ -601,6 +601,14 @@ config HAVE_ACPI_RESUME
is done, U-Boot needs to find out the wakeup vector provided by OSes is done, U-Boot needs to find out the wakeup vector provided by OSes
and jump there. and jump there.
config STACK_SIZE
hex
depends on HAVE_ACPI_RESUME
default 0x1000
help
Estimated U-Boot's runtime stack size that needs to be reserved
during an ACPI S3 resume.
config MAX_PIRQ_LINKS config MAX_PIRQ_LINKS
int int
default 8 default 8

12
arch/x86/lib/fsp/fsp_dram.c
View File

@@ -92,5 +92,17 @@ unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
entries[num_entries].type = E820_RESERVED; entries[num_entries].type = E820_RESERVED;
num_entries++; num_entries++;
#ifdef CONFIG_HAVE_ACPI_RESUME
/*
* Everything between U-Boot's stack and ram top needs to be
* reserved in order for ACPI S3 resume to work.
*/
entries[num_entries].addr = gd->start_addr_sp - CONFIG_STACK_SIZE;
entries[num_entries].size = gd->ram_top - gd->start_addr_sp + \
CONFIG_STACK_SIZE;
entries[num_entries].type = E820_RESERVED;
num_entries++;
#endif
return num_entries; return num_entries;
} }