diff options
| author | Arthur Heymans <arthur@aheymans.xyz> | 2022-11-01 23:57:24 +0100 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2022-12-23 14:29:01 +0000 |
| commit | 4d75dbd1c1d6362c002a26a5c4e6de74b2816cdf (patch) | |
| tree | 2c396dd953e83ba55e33990cc3389129915db239 /src | |
| parent | 96b49b5acbf5328ce2d317a7393db588a928926e (diff) | |
cpu/x86: Set up a separate stack for APs
APs use a lot less stack, so set up a separate stack for those in .bss.
Now that CPU_INFO_V2 is the only code path that is used, there is no
need to align stacks in c_start.S.
Change-Id: I7a681a2e3003da0400843daa5d6d6180d952abf5
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69123
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/x86/c_start.S | 8 | ||||
| -rw-r--r-- | src/cpu/x86/Kconfig | 7 | ||||
| -rw-r--r-- | src/cpu/x86/mp_init.c | 6 |
3 files changed, 14 insertions, 7 deletions
diff --git a/src/arch/x86/c_start.S b/src/arch/x86/c_start.S index 5b7052ef58..52aeb19b57 100644 --- a/src/arch/x86/c_start.S +++ b/src/arch/x86/c_start.S @@ -10,11 +10,9 @@ .global _estack .global _stack_size -/* Stack alignment is not enforced with rmodule loader, reserve one - * extra CPU such that alignment can be enforced on entry. */ -.align CONFIG_STACK_SIZE +.align 16 _stack: -.space (CONFIG_MAX_CPUS+1)*CONFIG_STACK_SIZE +.space CONFIG_STACK_SIZE _estack: .set _stack_size, _estack - _stack @@ -75,7 +73,7 @@ _start: /* Set new stack with enforced alignment. */ movl $_estack, %esp - andl $(~(CONFIG_STACK_SIZE-1)), %esp + andl $(0xfffffff0), %esp /* * Now we are finished. Memory is up, data is copied and diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig index 2253e18ade..7e5817537e 100644 --- a/src/cpu/x86/Kconfig +++ b/src/cpu/x86/Kconfig @@ -202,4 +202,11 @@ config RESERVE_MTRRS_FOR_OS However, modern OSes use PAT to control cacheability instead of using MTRRs. +config AP_STACK_SIZE + hex + default 0x800 + help + This is the amount of stack each AP needs. The BSP stack size can be + larger and is set with STACK_SIZE. + endif # ARCH_X86 diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c index f00418547e..507da7d1be 100644 --- a/src/cpu/x86/mp_init.c +++ b/src/cpu/x86/mp_init.c @@ -215,6 +215,8 @@ static asmlinkage void ap_init(unsigned int index) park_this_cpu(NULL); } +static __aligned(16) uint8_t ap_stack[CONFIG_AP_STACK_SIZE * CONFIG_MAX_CPUS]; + static void setup_default_sipi_vector_params(struct sipi_params *sp) { sp->gdt = (uintptr_t)&gdt; @@ -222,8 +224,8 @@ static void setup_default_sipi_vector_params(struct sipi_params *sp) sp->idt_ptr = (uintptr_t)&idtarg; sp->per_cpu_segment_descriptors = (uintptr_t)&per_cpu_segment_descriptors; sp->per_cpu_segment_selector = per_cpu_segment_selector; - sp->stack_size = CONFIG_STACK_SIZE; - sp->stack_top = ALIGN_DOWN((uintptr_t)&_estack, CONFIG_STACK_SIZE); + sp->stack_size = CONFIG_AP_STACK_SIZE; + sp->stack_top = (uintptr_t)ap_stack + ARRAY_SIZE(ap_stack); } static const unsigned int fixed_mtrrs[NUM_FIXED_MTRRS] = { |