arm: Keep track of the tlb size as well as its location
authorGabe Black <gabeblack@chromium.org>
Fri, 30 Nov 2012 13:01:15 +0000 (13:01 +0000)
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>
Thu, 10 Jan 2013 21:21:32 +0000 (22:21 +0100)
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>
arch/arm/include/asm/global_data.h
arch/arm/lib/board.c

index 2b9af93..41a26ed 100644 (file)
@@ -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 */
index 0459d0c..c214bba 100644 (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 */