From 601b27596ffdf526adf5b41c1f8366a5fdddc554 Mon Sep 17 00:00:00 2001 From: "Ronald G. Minnich" Date: Wed, 20 Feb 2013 09:24:29 -0800 Subject: ARMV7: minor tweaks to inter-stage calling and payload handling. Payloads, by design, can return. There's lots of mechanism in the payload code to support it, and the chooser payload relies on it. Hence, we should not mark the function call in exit_stage as noreturn. Not all ARM have unified caches, and it's not always easy to tell what to do. So we are very paranoid. Before we call between stages, we should carefully flush the dcache to memory and invalidate the icache. This may be more than is necessary on all architectures but it doesn't really hurt for the most part. So compile cache management code into all stages, and call the flush dcache/invalidate icache from all stages. Change-Id: Ib9cc625c4dfd2d7d4b3c69a74686cc655a9d6484 Signed-off-by: Ronald G. Minnich Reviewed-on: http://review.coreboot.org/2462 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/arch/armv7/lib/Makefile.inc | 3 +++ src/arch/armv7/lib/cache-cp15.c | 6 +++++- src/arch/armv7/stages.c | 16 +++++++++++++++- 3 files changed, 23 insertions(+), 2 deletions(-) (limited to 'src/arch') diff --git a/src/arch/armv7/lib/Makefile.inc b/src/arch/armv7/lib/Makefile.inc index 391b6a54b1..388864aa28 100644 --- a/src/arch/armv7/lib/Makefile.inc +++ b/src/arch/armv7/lib/Makefile.inc @@ -1,5 +1,7 @@ bootblock-y += syslib.c bootblock-$(CONFIG_EARLY_CONSOLE) += early_console.c +bootblock-y += cache_v7.c +bootblock-y += cache-cp15.c romstage-y += cache_v7.c romstage-y += cache-cp15.c @@ -14,6 +16,7 @@ ramstage-y += div64.S #ramstage-y += memcpy.S #ramstage-y += memset.S ramstage-y += syslib.c +ramstage-y += cache_v7.c #FIXME(dhendrix): should this be a config option? romstage-y += eabi_compat.c diff --git a/src/arch/armv7/lib/cache-cp15.c b/src/arch/armv7/lib/cache-cp15.c index cfbdb941a0..e08ea57a56 100644 --- a/src/arch/armv7/lib/cache-cp15.c +++ b/src/arch/armv7/lib/cache-cp15.c @@ -46,8 +46,12 @@ static void set_section_dcache(int section, enum dcache_option option) /* * FIXME(dhendrix): This calculation is from arch/arm/lib/board.c * in u-boot. We may need to subtract more due to logging. + * FIXME(rminnich) + * The cast avoids an incorrect overflow diagnostic. + * We really need to start adding ULL to constants that are + * intrinsically unsigned. */ - tlb_addr = (CONFIG_SYS_SDRAM_BASE + (CONFIG_DRAM_SIZE_MB << 20UL)); + tlb_addr = ((u32)CONFIG_SYS_SDRAM_BASE + (CONFIG_DRAM_SIZE_MB << 20UL)); tlb_addr -= tlb_size; /* round down to next 64KB limit */ tlb_addr &= ~(0x10000 - 1); diff --git a/src/arch/armv7/stages.c b/src/arch/armv7/stages.c index 05b3e1d9ff..c37c1ddc23 100644 --- a/src/arch/armv7/stages.c +++ b/src/arch/armv7/stages.c @@ -32,14 +32,28 @@ */ #include +#include void stage_entry(void) { main(); } +/* we had marked 'doit' as 'noreturn'. + * There is no apparent harm in leaving it as something we can return from, and in the one + * case where we call a payload, the payload is allowed to return. + * Hence, leave it as something we can return from. + */ void stage_exit(void *addr) { - __attribute__((noreturn)) void (*doit)(void) = addr; + void (*doit)(void) = addr; + /* make sure any code we installed is written to memory. Not all ARM have + * unified caches. + */ + flush_dcache_all(); + /* Because most stages copy code to memory, it's a safe and hygienic thing + * to flush the icache here. + */ + invalidate_icache_all(); doit(); } -- cgit v1.2.3