diff options
Diffstat (limited to 'src/include/usr/vmmconst.h')
| -rw-r--r-- | src/include/usr/vmmconst.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/include/usr/vmmconst.h b/src/include/usr/vmmconst.h index 33586a4db..df2d0f604 100644 --- a/src/include/usr/vmmconst.h +++ b/src/include/usr/vmmconst.h @@ -167,6 +167,22 @@ enum BlockPriority */ #define VMM_INTERNODE_PRESERVED_MEMORY_ADDR (96 * MEGABYTE) +/** Region of memory reserved for unsecure memory accesses + * + * The Secure BAR is placed at 64MB so that initially, everything above + * is marked secure and everything below is marked unsecure. External + * entities, such as FSP, can only access memory in the unsecure region. + * Items such as the Mailbox DMA buffer need to be placed into this region. + * + * We do not want to place this region directly at zero because in some cases + * we load a payload at address 0 (ex. Sapphire) and need to make sure there + * is enough room for the payload before any reserved unsecure space. + * + * Choosing (Secure BAR - Cache Size) as the value for this region, which + * allows us to have a payload image up to that size and up to 'Cache Size' + * worth of unsecure content. + */ +#define VMM_UNSECURE_RESERVED_MEMORY_BASEADDR (56 * MEGABYTE) /** * Test Constants |
