diff options
Diffstat (limited to 'src/cpu/amd/agesa/cache_as_ram.S')
| -rw-r--r-- | src/cpu/amd/agesa/cache_as_ram.S | 46 |
1 files changed, 42 insertions, 4 deletions
diff --git a/src/cpu/amd/agesa/cache_as_ram.S b/src/cpu/amd/agesa/cache_as_ram.S index b96a5e70e4..50242f7a54 100644 --- a/src/cpu/amd/agesa/cache_as_ram.S +++ b/src/cpu/amd/agesa/cache_as_ram.S @@ -29,6 +29,7 @@ .code32 .globl _cache_as_ram_setup, _cache_as_ram_setup_end +.globl chipset_teardown_car _cache_as_ram_setup: @@ -105,20 +106,44 @@ _cache_as_ram_setup: movd %mm0, %eax /* bist */ pushl %eax call romstage_main - movl %eax, %esp -/* Register %esp is new stacktop for remaining of romstage. - * It is the only register preserved in AMD_DISABLE_STACK. +#if IS_ENABLED(CONFIG_POSTCAR_STAGE) + +/* We do not return. Execution continues with run_postcar_phase() + * calling to chipset_teardown_car below. + */ + jmp postcar_entry_failure + +chipset_teardown_car: + +/* + * Retrieve return address from stack as it will get trashed below if + * execution is utilizing the cache-as-ram stack. */ + pop %esp + +#else + + movl %eax, %esp + +/* Register %esp is new stacktop for remaining of romstage. */ + +#endif -disable_cache_as_ram: /* Disable cache */ movl %cr0, %eax orl $CR0_CacheDisable, %eax movl %eax, %cr0 +/* Register %esp is preserved in AMD_DISABLE_STACK. */ AMD_DISABLE_STACK +#if IS_ENABLED(CONFIG_POSTCAR_STAGE) + + jmp *%esp + +#else + /* enable cache */ movl %cr0, %eax andl $0x9fffffff, %eax @@ -126,9 +151,22 @@ disable_cache_as_ram: call romstage_after_car +#endif + /* Should never see this postcode */ post_code(0xaf) + stop: + hlt + jmp stop + +/* These are here for linking purposes. */ +.weak early_all_cores, romstage_main +early_all_cores: +romstage_main: +postcar_entry_failure: + /* Should never see this postcode */ + post_code(0xae) jmp stop _cache_as_ram_setup_end: |