diff options
| -rw-r--r-- | src/cpu/amd/car/cache_as_ram.inc | 6 | ||||
| -rw-r--r-- | src/cpu/amd/car/post_cache_as_ram.c | 8 |
2 files changed, 13 insertions, 1 deletions
diff --git a/src/cpu/amd/car/cache_as_ram.inc b/src/cpu/amd/car/cache_as_ram.inc index 9874ec47a2..3295ccc3b1 100644 --- a/src/cpu/amd/car/cache_as_ram.inc +++ b/src/cpu/amd/car/cache_as_ram.inc @@ -20,7 +20,7 @@ #include <cpu/amd/mtrr.h> #define CacheSize CONFIG_DCACHE_RAM_SIZE -#define CacheBase (0xd0000 - CacheSize) +#define CacheBase CONFIG_DCACHE_RAM_BASE #define CacheSizeBSPStack CONFIG_DCACHE_BSP_STACK_SIZE #define CacheSizeBSPSlush CONFIG_DCACHE_BSP_STACK_SLUSH @@ -496,6 +496,10 @@ CAR_skip_k8_errata_part2: movl $(CacheBase + CacheSize), %eax movl %eax, %esp + /* Poison the lower stack boundary */ + movl $((CacheBase + CacheSize) - CacheSizeBSPStack), %eax + movl $0xdeadbeef, (%eax) + post_code(0xa3) jmp CAR_FAM10_ap_out diff --git a/src/cpu/amd/car/post_cache_as_ram.c b/src/cpu/amd/car/post_cache_as_ram.c index 49b9ee3fe3..26e611c8a8 100644 --- a/src/cpu/amd/car/post_cache_as_ram.c +++ b/src/cpu/amd/car/post_cache_as_ram.c @@ -98,6 +98,14 @@ void post_cache_as_ram(void) void *resume_backup_memory = NULL; uint32_t family = amd_fam1x_cpu_family(); + /* Verify that the BSP didn't overrun the lower stack + * boundary during romstage execution + */ + volatile uint32_t *lower_stack_boundary; + lower_stack_boundary = (void *)((CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE) - CONFIG_DCACHE_BSP_STACK_SIZE); + if ((*lower_stack_boundary) != 0xdeadbeef) + printk(BIOS_WARNING, "BSP overran lower stack boundary. Undefined behaviour may result!\n"); + struct romstage_handoff *handoff; handoff = romstage_handoff_find_or_add(); if (handoff != NULL) |