scripts: gen_mmu: Rectified MMU page table generation.

The script failed on certain corner cases. Whenever the memory region
was falling on the PDE boundary, the glitch was causing incorrect
PTE to be generated.

JIRA: ZEP-2328

Signed-off-by: Adithya Baglody <adithya.nagaraj.baglody@intel.com>
This commit is contained in:
Adithya Baglody 2017-07-01 13:23:58 +05:30 committed by Anas Nashif
commit 5ffffb86bf

View file

@ -132,7 +132,7 @@ def read_mmu_list_marshal_param():
# in case where it overflows the currenty PDE's range then limit the
# PTE to 1024 and so make the mem_size reflect the actual size taken up
# in the current PDE
if (region[1] + (pte_valid_addr_start * 4096) ) > (1024*4096):
if (region[1] + (pte_valid_addr_start * 4096) ) >= (1024*4096):
pte_valid_addr_end = 1024
mem_size = ( (pte_valid_addr_end - pte_valid_addr_start)*4096)
@ -157,40 +157,41 @@ def read_mmu_list_marshal_param():
# create all the extra PDEs needed to fit the requested size
# this loop starts from the current pde till the last pde that is needed
# the last pde is calcualted as the (start_addr + size) >> 22
for extra_pde in range(pde_index+1, get_pde_number(
region[0] + region[1])+1):
if overflow_size !=0:
for extra_pde in range(pde_index+1, get_pde_number(
region[0] + region[1])+1):
# new pde's start address
# each page directory entry has a addr range of (1024 *4096)
# thus the new PDE start address is a multiple of that number
extra_pde_start_address = extra_pde*(4096*1024)
# new pde's start address
# each page directory entry has a addr range of (1024 *4096)
# thus the new PDE start address is a multiple of that number
extra_pde_start_address = extra_pde*(4096*1024)
# the start address of and extra pde will always be 0
# and the end address is calculated with the new pde's start address
# and the overflow_size
extra_pte_valid_addr_end = get_pte_number(extra_pde_start_address
+ overflow_size)
# the start address of and extra pde will always be 0
# and the end address is calculated with the new pde's start address
# and the overflow_size
extra_pte_valid_addr_end = get_pte_number(extra_pde_start_address
+ overflow_size)
# if the overflow_size couldn't be fit inside this new pde then
# need another pde and so we now need to limit the end of the PTE
# to 1024 and set the size of this new region to the max possible
extra_region_size = overflow_size
if overflow_size > (1024*4096):
extra_region_size = 1024*4096
extra_pte_valid_addr_end = 1024
# if the overflow_size couldn't be fit inside this new pde then
# need another pde and so we now need to limit the end of the PTE
# to 1024 and set the size of this new region to the max possible
extra_region_size = overflow_size
if overflow_size > (1024*4096):
extra_region_size = 1024*4096
extra_pte_valid_addr_end = 1024
# load the new PDE's details
# load the new PDE's details
set_pde_pte_values(extra_pde, extra_pde_start_address,
extra_region_size,
0, extra_pte_valid_addr_end, region[2] )
set_pde_pte_values(extra_pde, extra_pde_start_address,
extra_region_size,
0, extra_pte_valid_addr_end, region[2] )
# for the next iteration of the loop the size needs to decreased
overflow_size -= (extra_pte_valid_addr_end) * 4096
# for the next iteration of the loop the size needs to decreased
overflow_size -= (extra_pte_valid_addr_end) * 4096
if extra_pde not in page_tables_list:
page_tables_list.append(extra_pde)
if extra_pde not in page_tables_list:
page_tables_list.append(extra_pde)
page_tables_list.sort()