lib: add helper for constructing coreboot forwarding table

The x86 architecture needs to add a forwarding table to
the real coreboot table. Provide a helper function to do
this for aligning the architectures on a common
write_tables() implementation.

Change-Id: I9a2875507e6260679874a654ddf97b879222d44e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14433
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
This commit is contained in:
Aaron Durbin 2016-04-19 17:06:09 -05:00
parent dcee908921
commit 8984af89b8
2 changed files with 19 additions and 0 deletions

View File

@ -9,6 +9,12 @@ unsigned long write_coreboot_table(
unsigned long low_table_start, unsigned long low_table_end,
unsigned long rom_table_start, unsigned long rom_table_end);
/*
* Write forwarding table of target address at entry address returning size
* of table written.
*/
size_t write_coreboot_forwarding_table(uintptr_t entry, uintptr_t target);
void fill_lb_gpios(struct lb_gpios *gpios);
void lb_add_gpios(struct lb_gpios *gpios, const struct lb_gpio *gpio_table,
size_t count);

View File

@ -445,6 +445,19 @@ static unsigned long lb_table_fini(struct lb_header *head)
return (unsigned long)rec + rec->size;
}
size_t write_coreboot_forwarding_table(uintptr_t entry, uintptr_t target)
{
struct lb_header *head;
printk(BIOS_DEBUG, "Writing table forward entry at 0x%p\n",
(void *)entry);
head = lb_table_init(entry);
lb_forward(head, (struct lb_header*)target);
return (uintptr_t)lb_table_fini(head) - entry;
}
unsigned long write_coreboot_table(
unsigned long low_table_start, unsigned long low_table_end,
unsigned long rom_table_start __unused, unsigned long rom_table_end)