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>

diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h
index 2b9af93..41a26ed 100644 (file)
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -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 */

diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
index 0459d0c..c214bba 100644 (file)
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -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 */