diff options
| author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2018-05-15 19:50:20 +0300 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-01-14 11:59:51 +0000 |
| commit | 2fbb6773e3a6d5d18e84b0ac79b645147fbf0d66 (patch) | |
| tree | a4c35e5e6167ea80573ec379585725d919a90b51 /src/cpu/x86/lapic | |
| parent | b318be22183ca4c306203479b4410ab6365235aa (diff) | |
arch/x86: Enforce CPU stack alignment
When rmodule is loaded CPU stack alignment is only guaranteed
to 4kiB. Implementation of cpu_info() requires that each
CPU sees its stack aligned to CONFIG_STACK_SIZE.
Add one spare CPU for the stack reserve, such that alignment can
be enforced runtime.
Change-Id: Ie04956c64df0dc7bb156002d3d4f2629f92b340e
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/26302
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/cpu/x86/lapic')
| -rw-r--r-- | src/cpu/x86/lapic/lapic_cpu_init.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/src/cpu/x86/lapic/lapic_cpu_init.c b/src/cpu/x86/lapic/lapic_cpu_init.c index 4498b97b1c..7daca0ac67 100644 --- a/src/cpu/x86/lapic/lapic_cpu_init.c +++ b/src/cpu/x86/lapic/lapic_cpu_init.c @@ -263,8 +263,8 @@ volatile unsigned int secondary_cpu_index; int start_cpu(struct device *cpu) { struct cpu_info *info; - unsigned long stack_end; - unsigned long stack_base; + uintptr_t stack_top; + uintptr_t stack_base; unsigned long apicid; unsigned int index; unsigned long count; @@ -278,23 +278,23 @@ int start_cpu(struct device *cpu) /* Get an index for the new processor */ index = ++last_cpu_index; - /* Find end of the new processor's stack */ - stack_end = ((unsigned long)_estack) - (CONFIG_STACK_SIZE*index) - - sizeof(struct cpu_info); - - stack_base = ((unsigned long)_estack) - (CONFIG_STACK_SIZE*(index+1)); - printk(BIOS_SPEW, "CPU%d: stack_base %p, stack_end %p\n", index, - (void *)stack_base, (void *)stack_end); + /* Find boundaries of the new processor's stack */ + stack_top = ALIGN_DOWN((uintptr_t)_estack, CONFIG_STACK_SIZE); + stack_top -= (CONFIG_STACK_SIZE*index); + stack_base = stack_top - CONFIG_STACK_SIZE; + stack_top -= sizeof(struct cpu_info); + printk(BIOS_SPEW, "CPU%d: stack_base %p, stack_top %p\n", index, + (void *)stack_base, (void *)stack_top); stacks[index] = (void *)stack_base; /* Record the index and which CPU structure we are using */ - info = (struct cpu_info *)stack_end; + info = (struct cpu_info *)stack_top; info->index = index; info->cpu = cpu; thread_init_cpu_info_non_bsp(info); /* Advertise the new stack and index to start_cpu */ - secondary_stack = stack_end; + secondary_stack = stack_top; secondary_cpu_index = index; /* Until the CPU starts up report the CPU is not enabled */ |