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arm: Keep track of the tlb size as well as its location 

It may be necessary to know where the TLB area ends as well as where it
starts. This allows board code to complete a secure memory erase without
destroying the page tables.

Signed-off-by: Gabe Black <gabeblack@google.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Gabe Black 2012-11-30 13:01:15 +00:00 committed by Albert ARIBAUD
parent 44df5e8d30
commit 724cdffca1
2 changed files with 4 additions and 2 deletions
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1
arch/arm/include/asm/global_data.h
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@ -73,6 +73,7 @@ typedef struct global_data {
unsigned long reloc_off;
#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
unsigned long tlb_addr;
unsigned long tlb_size;
#endif
const void *fdt_blob; /* Our device tree, NULL if none */
void **jt; /* jump table */

5
arch/arm/lib/board.c
View File

@ -348,13 +348,14 @@ void board_init_f(ulong bootflag)
#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
/* reserve TLB table */
addr -= (4096 * 4);
gd->tlb_size = 4096 * 4;
addr -= gd->tlb_size;
/* round down to next 64 kB limit */
addr &= ~(0x10000 - 1);
gd->tlb_addr = addr;
debug("TLB table at: %08lx\n", addr);
debug("TLB table from %08lx to %08lx\n", addr, addr + gd->tlb_size);
#endif
/* round down to next 4 kB limit */