intel/car: Fix stack guard placement
Make sure guard placement is above CAR region. Change-Id: I780cdc0b2a549e7ac4b23b0870619f5648a644e7 Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/21313 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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@ -15,6 +15,7 @@
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#include <console/console.h>
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#include <cpu/intel/romstage.h>
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#include <cpu/x86/mtrr.h>
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#include <arch/symbols.h>
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#include <program_loading.h>
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#define DCACHE_RAM_ROMSTAGE_STACK_SIZE 0x2000
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@ -25,9 +26,19 @@ asmlinkage void *romstage_main(unsigned long bist)
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void *romstage_stack_after_car;
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const int num_guards = 4;
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const u32 stack_guard = 0xdeadbeef;
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u32 *stack_base = (void *)(CONFIG_DCACHE_RAM_BASE +
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CONFIG_DCACHE_RAM_SIZE -
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DCACHE_RAM_ROMSTAGE_STACK_SIZE);
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u32 *stack_base;
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u32 size;
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/* Size of unallocated CAR. */
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size = _car_region_end - _car_relocatable_data_end;
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size = ALIGN_DOWN(size, 16);
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size = MIN(size, DCACHE_RAM_ROMSTAGE_STACK_SIZE);
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if (size < DCACHE_RAM_ROMSTAGE_STACK_SIZE)
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printk(BIOS_DEBUG, "Romstage stack size limited to 0x%x!\n",
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size);
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stack_base = (u32 *) (_car_region_end - size);
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for (i = 0; i < num_guards; i++)
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stack_base[i] = stack_guard;
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