From: Gabe Black gabeblack@chromium.org
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 --- Changes in v2: None
arch/arm/include/asm/global_data.h | 1 + arch/arm/lib/board.c | 5 +++-- 2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h index 2b9af93..41a26ed 100644 --- 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 22a4d9c..e03fc6d 100644 --- a/arch/arm/lib/board.c +++ b/arch/arm/lib/board.c @@ -353,13 +353,14 @@ 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 */