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coreboot tables: Add SPI flash memory map windows to coreboot tables

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This change adds details about the memory map windows to translate
addresses between SPI flash space and host address space to coreboot
tables. This is useful for payloads to setup the translation using the
decode windows already known to coreboot. Until now, there was a
single decode window at the top of 4G used by all x86
platforms. However, going forward, platforms might support more decode
windows and hence in order to avoid duplication in payloads this
information is filled in coreboot tables.

`lb_spi_flash()` is updated to fill in the details about these windows
by making a call to `spi_flash_get_mmap_windows()` which is
implemented by the driver providing the boot media mapping device.

BUG=b:171534504

Signed-off-by: Furquan Shaikh <furquan@google.com>
Change-Id: I00ae33d9b53fecd0a8eadd22531fdff8bde9ee94
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48185
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Furquan Shaikh 2020-11-25 17:15:09 -08:00
commit 493937e1d6
9 changed files with 101 additions and 0 deletions
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8
src/include/spi_flash.h
View file

@ -225,4 +225,12 @@ int spi_flash_vector_helper(const struct spi_slave *slave,
int (*func)(const struct spi_slave *slave, const void *dout,
size_t bytesout, void *din, size_t bytesin));
/*
* Fill in the memory mapped windows used by the SPI flash device. This is useful for payloads
* to identify SPI flash to host space mapping.
*
* Returns number of windows added to the table.
*/
uint32_t spi_flash_get_mmap_windows(struct flash_mmap_window *table);
#endif /* _SPI_FLASH_H_ */