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

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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 */