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 2b9af938068ed1e30e264bf65510104859ff5d2f..41a26edfb54d597d905d591a565053f8b70b0966 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 0459d0ce9fa06336d0c7721f8699d69c5fb81814..c214bba881a3cf1db70906acf61d62f416d9c8ae 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 */