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microblaze: Calculate kernel pad automatically 

The kernel needs to setup the first two tlbs with pad
which is used for early page allocation which is used
by mapin_ram() to allocate tables for lowmem memory
before memory initialisation is done.
Calculate pad directly from lowmem size.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2013-11-06 16:36:08 +01:00
parent edf6844ebf
commit 7f15a256b5
2 changed files with 1 additions and 5 deletions
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4
arch/microblaze/Kconfig
View File

@ -245,10 +245,6 @@ config MICROBLAZE_64K_PAGES
endchoice
config KERNEL_PAD
hex "Kernel PAD for unpacking" if ADVANCED_OPTIONS
default "0x80000" if MMU
endmenu
source "mm/Kconfig"

2
arch/microblaze/kernel/head.S
View File

@ -176,7 +176,7 @@ _invalidate:
/* start to do TLB calculation */
addik r12, r0, _end
rsub r12, r3, r12
addik r12, r12, CONFIG_KERNEL_PAD /* that's the pad */
addik r12, r12, CONFIG_LOWMEM_SIZE >> PTE_SHIFT /* that's the pad */
or r9, r0, r0 /* TLB0 = 0 */
or r10, r0, r0 /* TLB1 = 0 */